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SMT锡膏印刷标准

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发表于 2020-7-24 10:39:20 | 显示全部楼层 |阅读模式
SMT锡膏印刷标准
  SMT锡膏印刷标准及常见不良有:少锡、连锡、拉尖、移位、漏印、多锡、塌陷、PCB板脏等,SMT锡膏印刷厚度为钢网厚度的-0.02mm~+0.04mm;下面广晟德锡膏印刷机分享一下SMT锡膏印刷标准,包括允收标准和拒收标准。
  SMT锡膏印刷各元器件的标准
  一,CHIP元件印刷标准
  1.锡膏无偏移;
  2.锡膏量,厚度符合要求;
  3.锡膏成型佳.无崩塌断裂;
  4.锡膏覆盖焊盘90%以上。
  CHIP元件印刷允许
  1.钢网的开孔有缩孔,但锡膏仍有85%覆盖焊盘;
  2.锡膏量均匀;
  3.锡膏厚度在要求规格内
  4.印刷偏移量少于15%
  CHIP元件印刷拒收
  1.锡膏量不足.
  2.两点锡膏量不均.
  3.锡膏印刷偏移超过15%焊盘
  二,SOT 元件锡膏印刷标准
  1.锡膏无偏移;
  2.锡膏完全覆盖焊盘;
  3.三点锡膏均匀;
  4.锡膏厚度满足测试要求。
  SOT 元件锡膏印刷允许
  1.锡膏量均匀且成形佳;
  2.有85%以上锡膏覆盖焊盘;
  3.印刷偏移量少于15%;
  4.锡膏厚度符合规格要求
  SOT 元件锡膏印刷拒收
  1.锡膏85%以上未覆盖焊盘;
  2.有严重缺锡
  三,二极管、电容锡膏印刷标准
  1.锡膏印刷成形佳;
  2. 锡膏印刷无偏移;
  3.锡膏厚度测试符合要求;
  二极管、电容锡膏印刷允许
  1.锡膏量足;
  2。锡膏覆盖焊盘有85%以上;
  3.锡膏成形佳;
  4.印刷偏移量少于15%。
  二极管、电容锡膏印刷拒收
  1.焊盘15%以上锡膏未完全覆盖;
  2. 锡膏偏移超过15%焊盘
  四、焊盘间距=1.25-
  0.7MM 锡膏印刷标准 1.各锡膏100%覆盖各焊盘;
  2.锡膏量均匀,厚度在测试范围内;
  3.锡膏成型佳,无缺锡、崩塌;
  4.无偏移现象。
  焊盘间距=1.25-0.7MM 锡膏印刷允许
  1.锡膏成形佳,元件焊脚锡饱满,无崩塌、无桥接;
  2.有偏移,但未超过15%焊盘;
  3.锡膏厚度测试合乎要求;
  4.炉后焊接无缺陷。
  焊盘间距=1.25-0.7MM 锡膏印刷拒收
  1.锡膏超过15%未覆盖焊盘;
  2.偏移超过15%;
  3.锡膏几乎覆盖两条焊盘,炉后易造成短路;
  4.锡膏印刷形成桥连。
  五,焊盘间距=0.65MM 锡膏印刷标准
  1.各焊盘锡膏印刷均100%覆盖焊盘上;
  2.锡膏成形佳,无崩塌、无偏移、无桥接现象;
  3.锡膏厚度符合要求。
  焊盘间距=0.65MM 锡膏印刷允收
  1.锡膏成形佳,无桥接、无崩塌现象;
  2.锡膏厚度测试在规格内;
  3.各点锡膏偏移量小于10%焊盘。
  4.炉后焊接无缺陷。
  焊盘间距=0.65MM 锡膏印刷拒收
  1.锡膏超过10%未覆盖焊盘;
  2.偏移超过10%;
  3.锡膏几乎覆盖两条焊盘,炉后易造成短路;
  六,焊盘间距≤0.5MM 锡膏印刷标准
  1.各焊盘锡膏印刷均100%覆盖焊盘上;
  2. 锡膏成形佳,无崩塌现象;
  3.锡膏厚度符合要求
  焊盘间距≤0.5MM 锡膏印刷允收
  1.锡膏成形虽略微不佳,但锡膏厚度测试在规格内;
  2.各点锡膏无偏移、无桥接、无崩塌;
  3.炉后无少锡 假焊现象。
  焊盘间距≤0.5MM 锡膏印刷拒收
  1.锡膏成型不良,且断裂;
  2.锡膏塌陷、桥接;
  3.锡膏覆盖明显不足。
  深圳德森精密设备有限公司从事 点胶机 、涂覆机、全自动锡膏印刷机、smt锡膏印刷机研发生产销售为一体的smt锡膏印刷机厂家,提供全自动锡膏印刷机,smt锡膏印刷机定制,想要订购点胶机、涂覆机、锡膏印刷机,热线:0755-33666525; https://www.desen-sz.com/

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发表于 2020-7-24 10:41:49 | 显示全部楼层
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