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二手贴片机浅谈smt点胶工艺流程

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     作者:szzcx518      更新时间:2020/10/10 11:06:53      字体:
导读:SMT中使用的胶水主要用于片式元件、SOT、SOIC等表面安装器件的波峰焊过程。用胶水把表面安装元器件固定在PCB上的目的是要避免高温的波峰冲击作用下可能引起元器件的脱落或移位。一般生产中采用环氧树脂热固化类胶水,而不采用丙稀酸胶水(需紫外线照射固化)。下面小编讲解一下二手贴片机浅谈smt点胶工艺流程的相关知识。

smt点胶工艺流程  

SMT工作对贴片胶水的要求:   

1.JIAOSHUIYINGJUYOULIANGJIDECHUBIANTEXING;   

2.BULASI;   

3.SHIQIANGDUGAO;   

4.WUQIPAO;   

5.JIAOSHUIDEGUHUAWENDUDI,GUHUASHIJIANDUAN;   

6.JUYOUZUGOUDEGUHUAQIANGDU;   

7.XISHIXINGDI;   

8.JUYOULIANGHAODEFANXIUTEXING;   

9.WUDUXING;   

10.YANSEYISHIBIE,BIANYUJIANCHAJIAODIANDEZHILIANG;   

11.BAOZHUANG。 FENGZHUANGXINGSHIYINGFANGBIANYUSHEBEIDESHIYONG。

二手贴片机浅谈smt点胶工艺流程

2 在点胶过程中工艺控制起着相当重要的作用。   

SHENGCHANZHONGYICHUXIANYIXIAGONGYIQUEXIAN:JIAODIANDAXIAOBUHEGE、LASI、JIAOSHUIJINRANHANPAN、GUHUAQIANGDUBUHAOYIDIAOPIANDENG。JIEJUEZHEIXIEWENTIYINGZHENGTIYANJIUGEXIANGJISHUGONGYICANSHU,CONGERZHAODAOJIEJUEWENTIDEBANFA。   

2.1 点胶量的大小   

GENJUGONGZUOJINGYAN,JIAODIANZHIJINGDEDAXIAOYINGWEIHANPANJIANJUDEYIBAN,TIEPIANHOUJIAODIANZHIJINGYINGWEIJIAODIANZHIJINGDE1.5BEI。ZHEIYANGJIUNENGGOUBAOZHENGYOUCHONGZUDEJIAOSHUILAIZHANJIEYUANJIANYOUBIMIANGUODUOJIAOSHUIJINRANHANPAN。DIANJIAOLIANGDUOSHAOYOULUOXUANBENGDEXUANZHUANSHIJIANZHANGDUANLAIJUEDING,SHIJIZHONGYINGGENJUSHENGCHANQINGKUANG(SHIWEN、JIAOSHUIDEZHANXINGDENG)XUANZEBENGDEXUANZHUANSHIJIAN。   

2.2 点胶压力(背压)   

MUQIANSUOYONGDIANJIAOJICAIYONGLUOXUANBENGGONGJIDIANJIAOZHENTOUJIAOGUANCAIQUYIGEYALILAIBAOZHENGZUGOUJIAOSHUIGONGJILUOXUANBENG(YIMEIGUOCAMALOT5000WEILI)。BEIYAYALITAIDAYIZAOCHENGJIAOYICHU、JIAOLIANGGUODUO;YALITAIXIAOZEHUICHUXIANDIANJIAODUANXUXIANXIANG,LOUDIAN,CONGERZAOCHENGQUEXIAN。YINGGENJUTONGPINZHIDEJIAOSHUI、GONGZUOHUANJINGWENDULAIXUANZEYALI。HUANJINGWENDUGAOZEHUISHIJIAOSHUIZHANDUBIANXIAO、LIUDONGXINGBIANHAO,ZHEISHIXUDIAODIBEIYAJIUKEBAOZHENGJIAOSHUIDEGONGJI,FANZHIYIRAN。   

2.3 针头大小   

ZAIGONGZUOSHIJIZHONG,ZHENTOUNEIJINGDAXIAOYINGWEIDIANJIAOJIAODIANZHIJINGDE1/2,DIANJIAOGUOCHENGZHONG,YINGGENJUPCBSHANGHANPANDAXIAOLAIXUANQUDIANJIAOZHENTOU:RU0805HE1206DEHANPANDAXIAOXIANGCHABUDA,NENGGOUXUANQUTONGYIZHONGZHENTOU,DANSHIDUIYUXIANGCHAXUANSHUDEHANPANJIUYAOXUANQUBUTONGZHENTOU,ZHEIYANGJINENGGOUBAOZHENGJIAODIANZHILIANG,YOUNENGGOUTIGAOSHENGCHANXIAOLV。   

2.4 针头与PCB板间的距离   

BUTONGDEDIANJIAOJICAIYONGBUTONGDEZHENTOU,YOUXIEZHENTOUYOUJUEDUIDEZHIDONGDU(RUCAM/A LOT 5000)。MEICIGONGZUOJINXINGYINGZUOZHENTOUYUPCBJULIDEXIAOZHUN,JIZZHOUGAODUXIAOZHUN。   

2.5 胶水温度   

YIBANHUANYANGSHUZHIJIAOSHUIYINGBAOCUNZAI0--50CDEBINGXIANGZHONG,SHIYONGSHIYINGTIQIAN1/2XIAOSHINACHU,SHIJIAOSHUICHONGFENYUGONGZUOWENDUXIANGFUHE。JIAOSHUIDESHIYONGWENDUYINGWEI230C--250C;HUANJINGWENDUDUIJIAOSHUIDEZHANDUYINGXIANGHENDA,WENDUGUODIZEHUIJIAODIANBIANXIAO,CHUXIANLASIXIANXIANG。HUANJINGWENDUXIANGCHA50C,HUIZAOCHENG50%DIANJIAOLIANGDIAOZHENG。YINERDUIYUHUANJINGWENDUYINGJIAYIKONGZHI。TONGSHIHUANJINGDEWENDUYEYINGDANGJIYUBAOZHENG,SHIDUXIAOJIAODIANYIBIANGAN,YINGXIANGZHANJIELI。   

2.6 胶水的粘度   

JIAODEZHANDUZHIJIEYINGXIANGDIANJIAODEZHILIANG。ZHANDUDA,ZEJIAODIANHUIBIANXIAO,SHENZHILASI;ZHANDUXIAO,JIAODIANHUIBIANDA,JINERKENENGSHENRANHANPAN。DIANJIAOGUOCHENGZHONG,YINGDUIBUTONGZHANDUDEJIAOSHUI,XUANQUHELIDEBEIYAHEDIANJIAOXIAOLV。   

2.7 固化温度曲线   

DUIYUJIAOSHUIDEGUHUA,YIBANSHENGCHANCHANGJIAYIJICHUWENDUQUXIAN。ZAISHIJIYINGJINKENENGCAIYONGJIAOGAOWENDULAIGUHUA,SHIJIAOSHUIGUHUAHOUYOUZUGOUQIANGDU。   2.8 QIPAO   JIAOSHUIJUEDUIBUNENGYOUQIPAO。YIGEXIAOXIAOQIJIUHUIZAOCHENGXUDUOHANPANMEIYOUJIAOSHUI;MEICIZHONGTUGENGHUANJIAOGUANSHIYINGPAIKONGLIANJIECHUDEKONGQI,FANGZHICHUXIANKONGDAXIANXIANG。   

DUIYUYISHANGGECANSHUDEDIAOZHENG,YINGANYOUDIANJIMIANDEFANGSHI,RENHEYIGECANSHUDEDIAOZHENGDOUHUIYINGXIANGDAOQITAFANGMIAN,TONGSHIQUEXIANDECHANSHENG,KENENGSHIDUOGEFANGMIANSUOZAOCHENGDE,YINGDUIKENENGDEYINSUZHUXIANGJIANCHA,JINERPAICHU。ZONGZHI,ZAISHENGCHANZHONGYINGDANGANZHAOSHIJIQINGKUANGLAIDIAOZHENGGECANSHU,JIYAOBAOZHENGSHENGCHANZHILIANG,YOUNENGTIGAOSHENGCHANXIAOLV。


YISHANGSHIGUANYUERSHOUTIEPIANJIQIANTANERSHOUTIEPIANJIQIANTANsmtDIANJIAOGONGYILIUCHENGDEZHISHIFENXIANG,QINGHAIKUAI3YAMAHAERSHOUTIEPIANJIZHISHIJIUZAIZHONGCHUANGXINGTIEPIANJIGONGSIXINGYEXINWENLANMU。

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