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font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">FPC(Flexible Printed Circuit)是软性电路板，又称柔性电路板或挠性电路板，简称软板。电子产品小型化是必然发展趋势，相当一部分消费类产品的表面贴装，由于组装空间的关系，其SMD都是贴装在FPC上来完成整机的组装的，FPC在计算器、手机、数码相机、数码摄像机等数码产品上得到了普遍应用，在FPC上进行SMD的表面贴装已成为SMT技术发展趋势之一。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><img alt="FPC生产SMT工段的工艺要点" inline="0" img_height="354" img_width="468" style="border-top-style: none; box-sizing: border-box; max-width: 100%; border-bottom-style: none; border-right-style: none; margin: 10px auto; border-left-style: none; display: block; -webkit-tap-highlight-color: transparent" src="http://p3.pstatp.com/large/242f00051d01a21b57af" /><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">图1-1 FPC样品示例<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><img alt="FPC生产SMT工段的工艺要点" inline="0" img_height="350" img_width="462" style="border-top-style: none; box-sizing: border-box; max-width: 100%; border-bottom-style: none; border-right-style: none; margin: 10px auto; border-left-style: none; display: block; -webkit-tap-highlight-color: transparent" src="http://p1.pstatp.com/large/243100019821250c51e1" /><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">图1-2 带金属加强板的FPC样品示例<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">FPC表面SMT的工艺要求与传统硬板PCB的SMT解决方案有很多不同之处，要想做好FPC的SMT工艺，最重要的就是定位了。因为FPC板子的硬度不够，较柔软，如果不使用专用载板，就无法完成固定和传输，也就无法完成印刷、贴片、过炉等基本SMT工序。下面就FPC SMT生产中关于FPC的预处理、固定、印刷、贴片、回流焊、测试、检验、分板等工序的工艺要点分别详述。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><strong style="box-sizing: border-box; font-weight: 700; -webkit-tap-highlight-color: transparent">一．FPC的预处理</strong><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">FPC板子较柔软，出厂时一般不是真空包装，在运输和存储过程中易吸收空气中的水分，需在SMT投线前作预烘烤处理，将水分缓慢强行排出。否则，在回流焊接的高温冲击下，FPC吸收的水分快速气化变成水蒸气突出FPC，易造成FPC分层、起泡等不良。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">预烘烤条件一般为温度80-100℃时间4-8小时，特殊情况下，可以将温度调高至125℃以上，但需相应缩短烘烤时间。烘烤前，一定要先作小样试验，以确定FPC是否可以承受设定的烘烤温度，也可以向FPC制造商咨询合适的烘烤条件。烘烤时，FPC堆叠不能太多，10-20PNL比较合适，有些FPC制造商会在每PNL之间放一张纸片进行隔离，需确认这张隔离用的纸片是否能承受设定的烘烤温度，如果不能需将隔离纸片抽掉以后，再进行烘烤。烘烤后的FPC应该没有明显的变色、变形、起翘等不良，需由IPQC抽检合格后才能投线。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><strong style="box-sizing: border-box; font-weight: 700; -webkit-tap-highlight-color: transparent">二．专用载板的制作</strong><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">根据电路板的CAD文件，读取FPC的孔定位数据，来制造高精度FPC定位模板和专用载板，使定位模板上定位销的直径和载板上的定位孔、FPC上定位孔的孔径相匹配。很多FPC因为要保护部分线路或是设计上的原因并不是同一个厚度的，有的地方厚而有的地方要薄点，有的还有加强金属板，所以载板和FPC的结合处需要按实际情况进行加工打磨挖槽的，作用是在印刷和贴装时保证FPC是平整的。载板的材质要求轻薄、高强度、吸热少、散热快，且经过多次热冲击后翘曲变形小。常用的载板材料有合成石、铝板、硅胶板、特种耐高温磁化钢板等。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><strong style="box-sizing: border-box; font-weight: 700; -webkit-tap-highlight-color: transparent">普通载板：</strong>普通载板设计方便，打样快捷。常用的普通载板材料为工程塑料（合成石）、铝板等，工程塑料载板寿命有3000-7000次，操作性方便，稳定性较好，不易吸热，不烫手，价格是铝板的5倍以上。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><strong style="box-sizing: border-box; font-weight: 700; -webkit-tap-highlight-color: transparent">铝质载板：</strong>吸散热快，内外无温差，变形可简单修复，价格便宜、寿命长，主要缺点是烫手，要使用隔热手套取送。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><strong style="box-sizing: border-box; font-weight: 700; -webkit-tap-highlight-color: transparent">硅胶板：</strong><span class="Apple-converted-space"> </span>该材料具有自粘性，FPC直接粘在上面，不用胶带，而且取下也较容易，没有残胶，又耐高温。硅胶板在使用过程中，采用化学过程，硅胶材料在使用过程中会老化粘性下降，使用期间未清洁时粘性也会下降，寿命较短，最多1000-2000次，价格也比较高。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><strong style="box-sizing: border-box; font-weight: 700; -webkit-tap-highlight-color: transparent">磁性治具：</strong>特种耐高温（350℃）钢片加强磁化性能处理，保证回流焊过程中“永磁”，弹性好，平整度好，高温不变形。因为加强磁化性能处理的钢片已经把FPC表面压紧压平，FPC在回流焊接时就避免被回流焊风吹起所焊接不良，保证焊接质量稳定，提高成品率。只要不是人为破坏和事故破坏可以永久使用，寿命长。磁性治具同时对 FPC 进行隔热保护，取板时不会对 FPC 产生任何破坏。但磁性治具设计复杂，单价高，大批量生产时才具成本优势。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><img alt="FPC生产SMT工段的工艺要点" inline="0" img_height="347" img_width="436" style="border-top-style: none; box-sizing: border-box; max-width: 100%; border-bottom-style: none; border-right-style: none; margin: 10px auto; border-left-style: none; display: block; -webkit-tap-highlight-color: transparent" src="http://p3.pstatp.com/large/242e000522b5ea53cd47" /><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">图2 工程塑料（合成石）载板<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><img alt="FPC生产SMT工段的工艺要点" inline="0" img_height="339" img_width="445" style="border-top-style: none; box-sizing: border-box; max-width: 100%; border-bottom-style: none; border-right-style: none; margin: 10px auto; border-left-style: none; display: block; -webkit-tap-highlight-color: transparent" src="http://p3.pstatp.com/large/242e000522b4857f6974" /><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">图3 铝质载板<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><img alt="FPC生产SMT工段的工艺要点" inline="0" img_height="339" img_width="424" style="border-top-style: none; box-sizing: border-box; max-width: 100%; border-bottom-style: none; border-right-style: none; margin: 10px auto; border-left-style: none; display: block; -webkit-tap-highlight-color: transparent" src="http://p3.pstatp.com/large/242f00051d037293ee18" /><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">图4 硅胶板和定位模板<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><strong style="box-sizing: border-box; font-weight: 700; -webkit-tap-highlight-color: transparent">三．生产过程.</strong><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">我们在这里以普通载板为例详述FPC的SMT要点，使用硅胶板或磁性治具时，FPC的固定要方便很多，不需要使用胶带，而印刷、贴片、焊接等工序的工艺要点是一样的。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><strong style="box-sizing: border-box; font-weight: 700; -webkit-tap-highlight-color: transparent">1. FPC的固定：</strong><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">在进行SMT之前，首先需要将FPC精确固定在载板上。特别需要注意的是，从FPC固定在载板上以后，到进行印刷、贴装和焊接之间的存放时间越短越好。载板有带定位销和不带定位销两种。不带定位销的载板，需与带定位销的定位模板配套使用，先将载板套在模板的定位销上，使定位销通过载板上的定位孔露出来，将FPC一片一片套在露出的定位销上，再用胶带固定，然后让载板与FPC定位模板分离，进行印刷、贴片和焊接。带定位销的载板上已经固定有长约1.5mm的弹簧定位销若干个，可以将FPC一片一片直接套在载板的弹簧定位销上，再用胶带固定。在印刷工序，弹簧定位销可以完全被钢网压入载板内，不会影响印刷效果。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><strong style="box-sizing: border-box; font-weight: 700; -webkit-tap-highlight-color: transparent">方法一（单面胶带固定）：</strong>用薄型耐高温单面胶带将 FPC 四边固定在载板上，不让 FPC 有偏移和起翘，胶带粘度应适中,回流焊后必须易剥离,且在FPC上无残留胶剂。如果使用自动胶带机，能快速切好长短一致的胶带，可以显著提高效率，节约成本，避免浪费。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><strong style="box-sizing: border-box; font-weight: 700; -webkit-tap-highlight-color: transparent">方法二（双面胶带固定）：</strong>先用耐高温双面胶带贴在载板上，效果与硅胶板一样，再将 FPC 粘贴到载板，要特别注意胶带粘度不能太高,否则回流焊后剥离时,很容易造成FPC撕裂。在反复多次过炉以后，双面胶带的粘度会逐步变低，粘度低到无法可靠固定FPC时必须立即更换。此工位是防止FPC脏污的重点工位，需要戴手指套作业。载板重复使用前，需作适当清理，可以用无纺布蘸清洗剂擦洗，也可以使用防静电粘尘滚筒，以除去表面灰尘、锡珠等异物。取放FPC时切忌太用力，FPC较脆弱，容易产生折痕和断裂。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><img alt="FPC生产SMT工段的工艺要点" inline="0" img_height="320" img_width="386" style="border-top-style: none; box-sizing: border-box; max-width: 100%; border-bottom-style: none; border-right-style: none; margin: 10px auto; border-left-style: none; display: block; -webkit-tap-highlight-color: transparent" src="http://p3.pstatp.com/large/24310001981fcabff005" /><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">图5 圆盘形自动胶带机<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><img alt="FPC生产SMT工段的工艺要点" inline="0" img_height="297" img_width="436" style="border-top-style: none; box-sizing: border-box; max-width: 100%; border-bottom-style: none; border-right-style: none; margin: 10px auto; border-left-style: none; display: block; -webkit-tap-highlight-color: transparent" src="http://p1.pstatp.com/large/242f00051d0b2ff2739c" /><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">图6 防静电粘尘滚筒<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><img alt="FPC生产SMT工段的工艺要点" inline="0" img_height="320" img_width="475" style="border-top-style: none; box-sizing: border-box; max-width: 100%; border-bottom-style: none; border-right-style: none; margin: 10px auto; border-left-style: none; display: block; -webkit-tap-highlight-color: transparent" src="http://p9.pstatp.com/large/24320000dd146c335258" /><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">图7 耐高温单面胶带<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><img alt="FPC生产SMT工段的工艺要点" inline="0" img_height="405" img_width="388" style="border-top-style: none; box-sizing: border-box; max-width: 100%; border-bottom-style: none; border-right-style: none; margin: 10px auto; border-left-style: none; display: block; -webkit-tap-highlight-color: transparent" src="http://p1.pstatp.com/large/24300004d66eaa6b72f1" /><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">图8 耐高温双面胶带<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><strong style="box-sizing: border-box; font-weight: 700; -webkit-tap-highlight-color: transparent">2. FPC的锡膏印刷：</strong><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">FPC对焊锡膏的成分没有很特别的要求，锡球颗粒的大小和金属含量等以FPC上有没有细间距IC为准，但 FPC对焊锡膏的印刷性能要求较高，焊锡膏应具有优良的触变性，焊锡膏应该能够很容易印刷脱模并且能牢固地附着在FPC表面，不会出现脱模不良阻塞钢网漏孔或印刷后产生塌陷等不良。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">因为载板上装载FPC，FPC上有定位用的耐高温胶带，使其平面不一致,所以FPC的印刷面不可能象PCB那样平整和厚度硬度一致，所以不宜采用金属刮刀，而应采用硬度在80-90度的聚胺酯型刮刀。锡膏印刷机最好带有光学定位系统，否则对印刷质量会有较大影响，FPC虽然固定在载板上,但是FPC与载板之间总会产生一些微小的间隙，这是与PCB硬板最大的区别，因此设备参数的设定对印刷效果也会产生较大影响。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">印刷工位也是防止FPC脏污的重点工位，需要戴手指套作业，同时要保持工位的清洁，勤擦钢网，防止焊锡膏污染FPC的金手指和镀金按键。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><strong style="box-sizing: border-box; font-weight: 700; -webkit-tap-highlight-color: transparent">3. FPC的贴片：</strong><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">根据产品的特性、元件数量和贴片效率，采用中、高速贴片机进行贴装均可。由于每片FPC上都有定位用的光学MARK标记，所以在FPC上进行SMD贴装与在PCB上进行贴装区别不大。需要注意的是，虽然FPC被固定在载板上，但是其表面也不可能像PCB硬板一样平整，FPC与载板之间肯定会存在局部空隙，所以，吸嘴下降高度、吹气压力等需精确设定，吸嘴移动速度需降低。同时，FPC 以联板居多，FPC 的成品率又相对偏低，所以整PNL中含部分不良PCS是很正常的，这就需要贴片机具备BAD MARK识别功能，否则，在生产这类非整 PNL都是好板的情况下，生产效率就要大打折扣了。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><strong style="box-sizing: border-box; font-weight: 700; -webkit-tap-highlight-color: transparent">4. FPC的回流焊：</strong><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">应采用强制性热风对流红外回流焊炉，这样FPC上的温度能较均匀地变化，减少焊接不良的产生。如果是使用单面胶带的，因为只能固定FPC的四边，中间部分因在热风状态下变形，焊盘容易形成倾斜，熔锡（高温下的液态锡）会流动而产生空焊、连焊、锡珠，使制程不良率较高。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">1）温度曲线测试方法：<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">由于载板的吸热性不同，FPC上元件种类的不同，它们在回流焊过程中受热后温度上升的速度不同，吸收的热量也不同，因此仔细地设置回流焊炉的温度曲线，对焊接质量大有影响。比较稳妥的方法是，根据实际生产时的载板间隔，在测试板前后各放两块装有FPC的载板，同时在测试载板的FPC上贴装有元件，用高温焊锡丝将测试温探头焊在测试点上，同时用耐高温胶带将探头导线固定在载板上。注意，耐高温胶带不能将测试点覆盖住。测试点应选在靠近载板各边的焊点和QFP引脚等处，这样的测试结果更能反映真实情况。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">2）温度曲线的设置：<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">在炉温调试中，因为FPC的均温性不好，所以最好采用升温/保温/回流的温度曲线方式，这样各温区的参数易于控制一些，另外FPC和元件受热冲击的影响都要小一些。根据经验，最好将炉温调到焊锡膏技术要求值的下限，回焊炉的风速一般都采用炉子所能采用的最低风速，回焊炉链条稳定性要好,不能有抖动。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><strong style="box-sizing: border-box; font-weight: 700; -webkit-tap-highlight-color: transparent">5. FPC的检验、测试和分板：</strong><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">由于载板在炉中吸热，特别是铝质载板，出炉时温度较高，所以最好是在出炉口增加强制冷却风扇，帮助快速降温。同时，作业员需带隔热手套，以免被高温载板烫伤。从载板上拿取完成焊接的FPC时，用力要均匀，不能使用蛮力，以免FPC被撕裂或产生折痕。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">取下的FPC放在5倍以上放大镜下目视检验，重点检查表面残胶、变色、金手指沾锡、锡珠、IC引脚空焊、连焊等问题。由于FPC表面不可能很平整，使AOI的误判率很高，所以FPC一般不适合作AOI检查，但通过借助专用的测试治具，FPC可以完成ICT、FCT的测试。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">由于 FPC 以联板居多，可能在作 ICT、FCT 的测试以前，需要先做分板，虽然使用刀片、剪刀等工具也可以完成分板作业，但是作业效率和作业质量低下，报废率高。如果是异形FPC的大批量生产，建议制作专门的FPC冲压分板模，进行冲压分割，可以大幅提高作业效率，同时冲裁出的FPC边缘整齐美观，冲压切板时产生的内应力很低，可以有效避免焊点锡裂。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><img alt="FPC生产SMT工段的工艺要点" inline="0" img_height="508" img_width="382" style="border-top-style: none; box-sizing: border-box; max-width: 100%; border-bottom-style: none; border-right-style: none; margin: 10px auto; border-left-style: none; display: block; -webkit-tap-highlight-color: transparent" src="http://p3.pstatp.com/large/242d00019640e6d74df5" /><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">图9 FPC冲压分板模<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><img alt="FPC生产SMT工段的工艺要点" inline="0" img_height="441" img_width="583" style="border-top-style: none; box-sizing: border-box; max-width: 100%; border-bottom-style: none; border-right-style: none; margin: 10px auto; border-left-style: none; display: block; -webkit-tap-highlight-color: transparent" src="http://p1.pstatp.com/large/243100019822e10cd129" /><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: center; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">图10 FPC FCT测试治具<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px"><strong style="box-sizing: border-box; font-weight: 700; -webkit-tap-highlight-color: transparent">四．小结</strong><span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <p style="box-sizing: border-box; font-size: 16px; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: normal; color: rgb(34,34,34); padding-bottom: 0px; font-style: normal; text-align: justify; padding-top: 0px; padding-left: 0px; margin: 16px 0px; orphans: 2; widows: 2; letter-spacing: normal; padding-right: 0px; background-color: rgb(255,255,255); text-indent: 0px; -webkit-tap-highlight-color: transparent; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px">在FPC上进行SMD贴装， FPC的精确定位和固定是重点，固定好坏的关键是制作合适的载板。其次是FPC的预烘烤、印刷、贴片和回流焊。显然FPC的SMT工艺难度要比PCB硬板高很多，所以精确设定工艺参数是必要的，同时，严密的生产制程管理也同样重要，必须保证作业员严格执行SOP上的每一条规定，跟线工程师和IPQC应加强巡检，及时发现产线的异常情况，分析原因并采取必要的措施，才能将FPCSMT产线的不良率控制在几十个PPM之内。<span style="display:none">OFESMT技术网-China表面贴装技术-SMT表面贴装-SMT技术网【官网】</span></p> <center><img src="/AD/SMTfgx.gif"/ "/AD/smtjscn.jpg"/></center> <p><br> </p> <style> #cyPoll .vote_txtlist dd{ left: 50%; 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