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PCBA贴片不良缘由阐发

Release Time:2020-01-03 Edit the author:金致卓 Reading:2811

PCBA贴片出产进程中,因为操纵失误的影响,轻易致使PCBA贴片的不良,如:空焊,短路,翘立,缺件,锡珠,翘脚,浮高,错件,冷焊,反向,反白/背面,偏移,元件破坏,少锡,多锡,金手指粘锡,溢胶等,须要对这些不良展开阐发,并展开改良,进步产物品德。

一、空焊

红胶特同性较弱; 网板开孔不佳; 铜铂间距过大或大铜贴小元件; 刮刀压力大;  元件平坦度不佳(翘脚,变形)回焊炉预热区升温太快;  PCB铜铂太脏或是氧化; 

PCB板含有水份;机械贴片偏移;红胶印刷偏移;  机械夹板轨道松动致使贴片偏移;  MARK点误照致使元件打偏,致使空焊; 

二、短路

网板与PCB板间距过大致使红胶印刷过厚短路;元件贴片高度设置太低将红胶挤压致使短路;回焊炉升温过快致使;元件贴片偏移致使;网板开孔不佳(厚渡过厚,引脚开孔太长,开孔过大); 红胶没法蒙受元件分量;  网板或刮刀变形致使红胶印刷过厚;红胶特同性较强;  空贴点位封贴胶纸卷起致使周边元件红胶印刷过厚; 回流焊振动过大或不程度;

三、翘立

铜铂双方巨细不一形成拉力不匀; 预热升温速率太快;  机械贴片偏移;  红胶印刷厚度均;  回焊炉内温度散布不匀; 红胶印刷偏移;  机械轨道夹板不紧致使贴片偏移; 机械头部晃悠;  红胶特同性过强;  炉温设置不妥;  铜铂间距过大;  MARK点误照致使元婉转打偏

四、缺件

真空泵碳片不良真空不够致使缺件; 吸咀梗塞或吸咀不良;  元件厚度测试不妥或检测器不良; 贴片高度设置不妥; 吸咀吹气过大或不吹气;  吸咀真空设定不妥(合用于MPA); 异形元件贴片速渡过快;  头部气管破烈;  气阀密封环磨损; 回焊炉轨道边上有异物擦掉板上元件;

五、锡珠

回流焊预热缺乏,升温过快;  红胶经冷藏,回温不完整;  红胶吸湿形成喷溅(室内湿度太重); PCB板中水份适量;  加适量浓缩剂;  网板开孔设想不妥; 锡粉颗粒不匀。

六、偏移

电路板上的定位基准点不清楚;电路板上的定位基准点与网板的基准点沒有对正;电路板在印刷机内的牢固夹持松动,定位模具顶针不到位;印刷机的光学定位体系毛病;焊锡膏漏印网板开孔与电路板的设想文件不合适。要改良PCBA贴片的不良,还需在各个关键展开严酷把关,避免上一个工序的题目尽能够少的流到下一道工序。

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