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title_diff: "[{\"diffs\":[[1,\"SMT工艺流程与要求，没去过SMT厂的同学，请进来一下\"]],\"start1\":0,\"start2\":0,\"length1\":0,\"length2\":27}]"
body_diff: "[{\"diffs\":[[1,\"<html>\\\r\\\n<head>\\\r\\\n  <title>SMT工艺流程与要求，没去过SMT厂的同学，请进来一下</title>\\\r\\\n  <basefont face=\\\"微软雅黑\\\" size=\\\"2\\\" />\\\r\\\n  <meta http-equiv=\\\"Content-Type\\\" content=\\\"text/html;charset=utf-8\\\" />\\\r\\\n  <meta name=\\\"exporter-version\\\" content=\\\"YXBJ Windows/608924 (zh-CN, DDL); Windows/10.0.0 (Win64); EDAMVersion=V2;\\\"/>\\\r\\\n  <style>\\\r\\\n\\tbody, td {\\\r\\\n\\t  font-family: 微软雅黑;\\\r\\\n\\t  font-size: 12pt;\\\r\\\n\\t}\\\r\\\n  </style>\\\r\\\n</head>\\\r\\\n<body>\\\r\\\n<a name=\\\"15749\\\"></a>\\\r\\\n<h1>SMT工艺流程与要求，没去过SMT厂的同学，请进来一下</h1>\\\r\\\n\\\r\\\n<div><span style=\\\"margin:0px;\\\"><div style=\\\"padding:8px 0px;margin:8px auto;max-width:700px;\\\"> <div style=\\\"padding:20px 16px 12px;margin:0;background-color:#fff\\\"><div style=\\\"margin:0;padding:0\\\"><div style=\\\"margin:0;padding:0\\\"><h2 style=\\\"font-weight:400;margin:0;padding:0;font-size:22px;line-height:1.4;margin-bottom:14px\\\"> SMT工艺流程与要求，没去过SMT厂的同学，请进来一下 </h2><div style=\\\"margin:0;padding:0;margin-bottom:22px;line-height:20px;font-size:0;word-wrap:break-word;word-break:break-all\\\"><span style=\\\"padding:0;display:inline-block;vertical-align:middle;margin:0 10px 10px 0;font-size:15px;-webkit-tap-highlight-color:rgba(0,0,0,0);color:rgba(0,0,0,0.3)\\\"> 科林 </span><span style=\\\"padding:0;display:inline-block;vertical-align:middle;margin:0 10px 10px 0;font-size:15px;-webkit-tap-highlight-color:rgba(0,0,0,0);position:relative\\\"><a style=\\\"margin:0;padding:0;color:#576b95;text-decoration:none;-webkit-tap-highlight-color:rgba(0,0,0,0)\\\"> EDA设计智汇馆 </a></span><em style=\\\"padding:0;font-style:normal;display:inline-block;vertical-align:middle;margin:0 10px 10px 0;font-size:15px;-webkit-tap-highlight-color:rgba(0,0,0,0);color:rgba(0,0,0,0.3)\\\"></em></div><div style=\\\"margin:0;padding:0;overflow:hidden;color:#333;font-size:17px;word-wrap:break-word;-webkit-hyphens:auto;-ms-hyphens:auto;hyphens:auto;text-align:justify\\\"><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">1.1</span></strong><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">回流焊工艺流程</span></strong></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">回流焊接是指通过融化预先印刷在PCB焊盘上的锡膏，实现表面组装元器件焊端或引脚与PCB焊盘之间机械和电器连接的一种软钎焊工艺。其工艺流程为：印刷锡膏--贴片--回流焊接，如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/311ee7445777468f9bfb2efe18a376e2\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">1.1.1</span></strong><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">锡膏印刷</span></strong></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体;text-indent:28px\\\">其目的是将适量的锡膏均匀的施加在PCB的焊盘上，以保证贴片元器件与PCB相对应的焊盘再回流焊接时，达到良好的电器连接，并具有足够的机械强度。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">怎么样保证焊膏均匀的施加在各焊盘上呢？</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">我们需要制作钢网。锡膏通过各焊盘在钢网上对应的开孔，在刮刀的作用下将锡均匀的涂覆在各焊盘上。钢网图实例如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"></span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/bc9400d373c84f1087dd1b4e0b981ffe\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px;font-family:Calibri,sans-serif\\\"> </span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px;font-family:宋体\\\">锡膏印刷示意图如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/f697fb181e514ec1a536087f2ea120d9\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px;font-family:宋体\\\">印刷好锡膏的</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px;font-family:Calibri,sans-serif\\\">PCB</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px;font-family:宋体\\\">如下图所示。</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px;font-family:宋体\\\"></span><br style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/0dce3632c6d64097a4dc958aca00ffaf\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">1.1.2</span></strong><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">贴片</span></strong></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">本工序是用贴装机将片式元器件准确的贴装到印好锡膏或贴片胶的PCB表面相应的位置。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">贴片机按照功能可分为两种类型：</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">A</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">高速机：适用于贴装小型大量的组件：如电容，电阻等，也可贴装一些IC组件，但精度收到限制。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\"> B</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">泛用机：适用于贴装异性的或精密度高的组件：如QFP，BGA，SOT，SOP，PLCC等。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px;font-family:宋体\\\">贴片机设备图如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/0adb5588622647b6a8aace7cbf7ee4cd\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体;text-indent:28px\\\">贴片后的PCB如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px;font-family:宋体\\\"></span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/9b1f721ca512444d90390d348982560f\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\">1.1.3</strong><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">回流焊接</span></strong></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">回流焊是英文</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px\\\">Reflow Soldring</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">的直译，是通过熔化电路板焊盘上的锡膏，实现表面组装元器件焊端与</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px\\\">PCB</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">焊盘之间机械与电气连接，形成电气回路。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">回流焊作为</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px\\\">SMT</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">生产中的关键工序，合理的温度曲线设置是保证回流焊质量的关键。不恰当的温度曲线会使</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px\\\">PCB</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">板出现焊接不全、虚焊、元件翘立、焊锡球过多等焊接缺陷，影响产品质量。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体;text-indent:28px\\\">回流焊接炉设备图如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/ef29af33fe4c4b10a72b1cebabdd1332\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">经过回流炉，回流焊接完成的</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px\\\">PCB</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/e19c04c92f514cc59b967cd12a3b061d\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\">1.2</strong><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">波峰焊工艺流程                                                </span></strong><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">波峰焊一般是针对于插件器件的一种焊接工艺。是将熔融的液态焊料，借助于泵的作用，在焊料槽液面形成特定形状的焊料波，插装了元器件的</span>PCB<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">在传送链上经过某一特定的角度以及一定的浸入深度穿过焊料波峰而实现焊点焊接的过程，如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\">                        <img src=\\\":/f575fc1e06ae4260b2e87c352b35b5e2\\\" type=\\\"image/png\\\" data-filename=\\\"640.png\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">其一般工艺流程为：器件插装</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px\\\">--PCB</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">上料</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px\\\">--</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">波峰焊</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px\\\">--PCB</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">下料</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px\\\">--DIP</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">引脚修剪</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px\\\">--</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;text-indent:28px;font-family:宋体\\\">清洗，如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"></span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/b8652edb45604c26874c747eacff59b7\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"> 1.2.1 THC</span></strong><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">插装技术</span></strong></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"> 1.</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">元器件引脚成型</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"> DIP</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">器件在插装之前需要对引脚进行整形</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">（1）手工加工的元器件整形：弯引脚可以借助镊子或小螺丝刀对引脚整形，如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/d23008611fff4cda8b067aa3bc3282e3\\\" type=\\\"image/png\\\" data-filename=\\\"640.png\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\">2<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">）机器加工的元器件整形：元器件的机器整形是用专用的整形机械来完成，其工作原理是，送料器用震动送料方式送物料，（比如说插件三极管）用分割器定位三极管，第一步先把左右两边的引脚折弯成型；第二步将中间引脚向后或向前折弯成型。如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"></span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/8f97f248add64a79a2e3504bd3c9313d\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"> 2.<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">元器件插装</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\">  <span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">通孔插装技术分为手工插装和自动机械设备插装</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:0\\\">（1）<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">手工插装、焊接，应该先插装那些需要机械固定的元器件，如功率器件的散热架、支架、卡子等，然后再插装需焊接固定的元器件。插装时不要用手直接碰元器件引脚和印刷板上的铜箔。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:0\\\">（2）<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">机械自动插件（简称</span>AI<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">）是当代电子产品装联中较先进的自动化生产技术。自动机械设备插装应该先插装那些高度较低的元器件，后安装那些高度较高的元器件，贵重的关键元器件应该放到最后插装，散热架、支架、卡子等的插装，要靠近焊接工序。</span>PCB<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">元器件装配顺序如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/255faae4321648e59466f49b1381e27e\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\">1.2.2<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">波峰焊</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"> </span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">（1）波峰焊工作原理</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">波峰焊是种借助泵压作用，使熔融的液态焊料表面形成特定形状的焊料波，当插装了元器件的装联组件以定角度通过焊料波时，在引脚焊区形成焊点的工艺技术。组件在由链式传送带传送的过程中，先在焊机预热区进行预热(组件预热及其所要达到的温度依然由预定的温度曲线控制)。实际焊接中，通常还要控制组件面的预热温度，因此许多设备都增加了相应的温度检测装置(如红外探测器)。预热后，组件进入铅槽进行焊接。锡槽盛有熔融的液态焊料，钢槽底部喷嘴将熔碰焊料喷出定形状的波峰，这样，在组件焊接面通过波时就被焊料波加热，同时焊料波也就润湿焊区并进行扩展填充，终实现焊接过程。其工作原理如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/d151ba8091094eefb5651b7f32482cec\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体;text-indent:28px\\\">波峰焊是采用对流传热原理对焊区进行加热的。熔融的焊料波作为热源，一方面流动以冲刷引脚焊区，另一方面也起到了热传导作用，引脚焊区正是在此作用下加热的。为了保证焊区升温，焊料波通常具有一定的宽度，这样，当组件焊接面通过波时就有充分的加热、润湿等时间。传统的波峰焊中，一般采用单波，而且波比较平坦。随着铅焊料的使用，目前多采取双波形式。如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\">                  <img src=\\\":/6f053896e8984362b6ab316ddfce0b04\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">元器件的引脚为固态，焊料浸入金属化通孔提供了条途径。当引脚接触到焊料波后，借助于表面张力的作用，液态焊料沿引脚和孔壁向上爬升。金属化通孔的毛细管作用进步促进了焊料的爬升。焊料到达PcB部焊盘后，在焊盘的表面张力作用下铺展开来。上升中的焊料排出了通孔中的焊剂气体和空气，从而填充了通孔，在冷却后终形成了焊点。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\">  <span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">（</span>2<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">）波峰焊机的主要部件构成</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:16px;font-family:Arial,sans-serif\\\">   </span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:16px;font-family:宋体\\\">一</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">台波峰焊机，主要由传送带、加热器、锡槽、泵、助焊剂发泡（或喷雾）装置等组成。主要分为助焊剂添加区、预热区、焊接区、冷却区，如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/b2743a6a436c43319ba5b8085f4815e2\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">1.2.3 </span></strong><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">波峰焊与回流焊的主要区别</span></strong></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体;font-weight:normal\\\">波峰焊与回流焊的主要区别在于焊接中的加热源和焊料的供给方式不同。</span></strong><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">波峰焊中，焊料在槽中被预先加热熔化状态，泵起的焊料波起着热源和提供焊料的双重作用。熔融的焊料波使PCB的通孔、焊盘和元器件引脚被加热，同时也为形成焊点提供了所需的焊料。在回流焊中，焊料(焊锡膏)是被预先定量分配到PCB的焊区上，回流时热源的作用在于使焊料重新被熔化。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">1.3</span></strong><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">选择性波峰焊接工艺介绍</span></strong></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体;background:white\\\">波峰焊设备发明至今已有</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:Arial,sans-serif;background:white\\\">50</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体;background:white\\\">多年的历史了，在通孔元器件电路板的制造中具有生产效率高和产量大等优点，因此曾经是电子产品自动化大批量生产中最主要的焊接设备。但是，在其应用中也存在有一定的局限性：</span></p><h3 style=\\\"font-weight:400;font-size:16px;margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;background:white\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px\\\">   </span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px\\\">（1）焊接参数不同。</span></h3><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体;background:white\\\">同一块线路板上的不同焊点因其特性不同</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:Arial,sans-serif;background:white\\\">(</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体;background:white\\\">如热容量、引脚间距、透锡要求等），其所需的焊接参数可能大相径庭。但是，波峰焊的特点是使整块线路板上的所有焊点在同一设定参数下完成焊接，因而不同焊点间需要彼此“将就”，这使得波峰焊较难完全满足高品质线路板的焊接要求；</span></p><h3 style=\\\"font-weight:400;font-size:16px;margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;background:white\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px;font-family:Arial,sans-serif\\\">   </span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px\\\">（</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px;font-family:Arial,sans-serif\\\">2</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px\\\">）</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px\\\">运行成本较高。</span></h3><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体;background:white\\\">在传统波峰焊的实际应用中，助焊剂的全板喷涂和锡渣的产生都带来了较高的运行成本；尤其是无铅焊接时，因为无铅焊料的价格是有铅焊料的</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:Arial,sans-serif;background:white\\\">3</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体;background:white\\\">倍以上，锡渣产生所带来的运行成本增加是很惊人的。此外，无铅焊料不断熔解焊盘上的铜，时间一长便会使锡缸中的焊料成分发生变化，这需要定期添加纯锡和昂贵的银来加以解决；</span></p><h3 style=\\\"font-weight:400;font-size:16px;margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;background:white\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px;font-family:Arial,sans-serif\\\">   </span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px\\\">（</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px;font-family:Arial,sans-serif\\\">3</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px\\\">）</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-size:14px\\\">维护与保养麻烦。</span></h3><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体;background:white\\\">生产中残余的助焊剂会留在波峰焊的传送系统中，而且产生的锡渣需要定期清除，这些都给使用者带来较为繁复的设备维护与保养工作；</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:Arial,sans-serif;background:white\\\">......</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体;background:white\\\">诸如此类的原因，选择性波峰焊应运而生。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">所谓的PCBA选择性<strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\">波峰焊接</strong>还是采用原来的锡炉，所不同的是板子需要放到过锡炉载具/托盘(carrier)之中，也就是我们常说的过炉治具，如图下所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/36db99e165a94949888ca5d2e649420f\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">然后将需要波峰焊接的零件露出来沾锡而已，其他的零件则用载具包覆保护起来，如下图所示。这有点像是在游泳池中套上救生圈一样，被救生圈覆盖住的地方就不会沾到水，换成锡炉，被载具包覆的地方自然就不会沾到锡，也就不会有重新融锡或掉件的问题。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/169a9a2f7e93453b91dafc970870e614\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/3061746c5ba940c682b6753c5b1d96ef\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"> 1.4</span></strong><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">通孔回流焊接工艺介绍</span></strong></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">通孔回流焊是一种插装元器件的回流焊接工艺方法，主要用于含有少数插件的表面组装板的制造，其技术的核心是焊膏的施加方法。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">1.4.1</span></strong><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">工艺流程介绍</span></strong></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">根据焊膏的施加方法，通孔回流焊可分为三种：管状印刷通孔回流焊接工艺、焊膏印刷通孔回流焊接工艺和成型锡片通孔回流焊接工艺。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">1.</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">管状印刷通孔回流焊接工艺</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">   </span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">管状印刷通孔回流焊接工艺是最早应用的通孔元器件回流焊接工艺，主要应用于彩色电视机调谐器的制造。其工艺的核心是焊膏的管状印刷机，工艺过程如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/202d8bae028f48e1bc3563d73e2e5aa9\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"> 2.<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">焊膏印刷通孔回流焊接工艺</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">焊膏印刷通孔回流焊接工艺是目前应用最多的通孔回流焊接工艺，主要用于含有少量插件的混装</span>PCBA<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">，工艺与常规回流焊接工艺完全兼容，不需要特殊工艺设备，唯一的要求就是被焊接的插装元器件必须适合通孔回流焊，工艺过程如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/9de65923b6f6417e95cb2483a41dbc70\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\">3.<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">成型锡片通孔回流焊接工艺</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">成型锡片通孔回流焊接工艺主要用于多脚的连接器，焊料不是焊膏而是成型锡片，一般由连接器厂家直接加好，组装时仅加热即可。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">1.4.2</span></strong><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">通孔回流焊设计要求</span></strong></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">1.</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">PCB</span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">设计要求</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"> </span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">（1）适合PCB厚度小于等于1.6mm的板。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"> </span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">（2）焊盘最小还款0.25mm，一遍“拉”住熔融焊膏，不形成锡珠。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"> </span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">（3）元器件离板间隙（Stand-off）应大于0.3mm</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"> </span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">（4）引线伸出焊盘合适的长度为0.25~0.75mm。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"> </span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">（5）0603等精细间距元器件离焊盘最小距离为2mm。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"> </span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">（6）钢网开孔最大可外扩1.5mm。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"> </span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">（7）孔径为引线直径加0.1~0.2mm。如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/4fab0a3439c94a579c2d6e260f1d0ec6\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\">1.<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">钢网开窗要求</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\">    <span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">一般而言，为了达到</span>50%<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">的孔填充，钢网开窗必须外扩，具体外扩多少，应根据</span>PCB<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">厚度、钢网的厚度、孔与引线的间隙等因素决定。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">一般来说，外扩只要不超过</span>2mm<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">，焊膏都会拉回来，填充到孔中。要注意的是外扩的地方不能被元器件封装压住，或者说必须避开元器件的封装体，一面形成锡珠，如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/37242ac828b5428481144b18e30f9cd0\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\"> <strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\">1.5 PCBA的常规组装类型及工艺流程介绍</strong></span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">   <strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\">1.5.1 </strong></span><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">单面贴装</span></strong></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">   </span><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">工艺流程如下图所示</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/33e0bc725b5c4f8d939f459be9c56515\\\" type=\\\"image/png\\\" data-filename=\\\"640.png\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">1.5.2 </span></strong><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">单面插装</span></strong></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">工艺流程如下图5所示</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/4aa9b79239d9406280595c69d97bdcf1\\\" type=\\\"image/png\\\" data-filename=\\\"640.png\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">波峰焊中器件引脚的成型工作，是生产过程中效率最低的部分之一，相应带来了静电损坏风险并使交货期延长，还增加了出错的机会。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">1.5.3 </span></strong><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">双面贴装</span></strong></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">工艺流程如下图所示</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/fb76ba25c14547a1a56c2353fed7a5e6\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">1.5.3 </span></strong><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">单面混装</span></strong></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">工艺流程如下图所示</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/0a12be1843b14a00a2d548604e2b9b5a\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">如果通孔元件很少，可采用回流焊和手工焊的方式。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">1.5.5 </span></strong><strong style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">双面混装</span></strong></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">工艺流程如下图所示</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/8c2499ae02b64bb2b996ce87f32d1e38\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em;text-indent:28px\\\"><span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">如果双面</span>SMD<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">器件较多，</span>THT<span style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;font-family:宋体\\\">元件很少时，插件器件可采用回流焊或者手工焊的方式，其工艺流程图如下图所示。</span></p><p style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;clear:both;min-height:1em\\\"><img src=\\\":/5bceeef42b6c44369b230b9314bc98dd\\\" type=\\\"image/jpeg\\\" data-filename=\\\"640.jpg\\\" style=\\\"margin:0;padding:0;max-width:100% !important;box-sizing:border-box !important;-webkit-box-sizing:border-box !important;word-wrap:break-word !important;height:auto !important\\\"/></p><p style=\\\"margin:0;padding:0;max-width:100% 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