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Release Time:2020-01-03 Edit the author:电子游戏厅下载 Reading:1963

PCBA贴片生产过chengzhong,由于操作失误的影响,容yidao致PCBA贴片的bu良,如:konghan,短lu,qiao立,缺jian,锡珠,qiao脚,浮gao,cuojian,冷han,反向,反白/反面,偏移,元jian破损,少锡,多锡,金手指粘锡,溢jiao等,需要对这些bu良开展fen析,并开展改进,提gao苀en省

yi、konghan

红jiaote异性较弱; 网板开孔bu佳; 铜铂jianju过大或大铜贴小元jian; 刮刀压li大;  元jian平整度bu佳(qiao脚,变形)回hanlu预热区升wentai快;  PCB铜铂tai脏或是氧化; 

PCB板含有水fen;机qi贴片偏移;红jiao印shua偏移;  机qijia板轨道松动dao致贴片偏移;  MARK点误zhaodao致元jianda偏,dao致konghan; 

二、短lu

网板与PCB板jianju过大dao致红jiao印shua过厚短lu;元jian贴片gao度she置过低将红jiao挤压dao致短lu;回hanlu升wen过快dao致;元jian贴片偏移dao致;网板开孔bu佳(厚度过厚,引脚开孔过chang,开孔过大); 红jiaomei法承受元jian重liang;  网板或刮刀变形dao致红jiao印shua过厚;红jiaote异性较强;  kong贴点位封贴jiao纸juan起dao致周bian元jian红jiao印shua过厚; 回流han振动过大或bu水平;

三、qiao立

铜铂两bian大小buyi造成拉libu匀; 预热升wen速率tai快;  机qi贴片偏移;  红jiao印shua厚度均;  回hanlu内wen度fenbubu匀; 红jiao印shua偏移;  机qi轨道jia板bu紧dao致贴片偏移; 机qi头部晃动;  红jiaote异性过强;  luwenshe置bu当;  铜铂jianju过大;  MARK点误zhaodao致元悠扬da偏

四、缺jian

真kongbengtan片bu良真kongbu够dao致缺jian; 吸咀堵sai或吸咀bu良;  元jian厚度测试bu当或检测qibu良; 贴片gao度she置bu当; 吸咀吹气过大或bu吹气;  吸咀真kongshe定bu当(适用于MPA); 异形元jian贴片速度过快;  头部气管破烈;  气阀密封环磨损; 回hanlu轨道bianshang有异物擦掉板shang元jian;

wu、锡珠

回流han预热bu足,升wen过快;  红jiao经冷藏,回wenbuwan全;  红jiao吸shi造成喷溅(室内shi度tai重); PCB板zhong水fen过多;  加过liang稀shi剂;  网板开孔she计bu当; 锡粉ke粒bu匀。

六、偏移

电lu板shang的定位ji准点buqingxi;电lu板shang的定位ji准点与网板的ji准点沒有对正;电lu板在印shua机内的固定jia持松动,定位模具顶针bu到位;印shua机的光学定位系统故障;han锡gao漏印网板开孔与电lu板的she计wenjianbu符he。要改进PCBA贴片的bu良,还需在各个环节开展yan格把关,防止shangyi个gong序的问题尽可能少的流到下yi道gong序。

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