意甲竞猜

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SMT锡膏印刷工艺

设备成色:未知发布时间:2019-12-19 11:49

SMT锡膏印刷工艺

 在表面贴装装配的回流焊接中,锡膏用于表面贴装组件的引脚或端子与焊盘之间的连接。有许多变量,如锡膏、丝印机、锡膏应用方法和印刷工艺过程。在印刷锡膏的过程中,基板放在工作台上,机械地或真空夹紧定位,用定位销或视觉来对准。或者丝网(screen)或者模板(stencil)用于锡膏印刷。本文将着重讨论几个关键的锡膏印刷问题,如模板设计和印刷工艺过程。
  
 印刷工艺过程与设备

  ZAIXIGAOYINSHUAGUOCHENGZHONG,XIGAOYINSHUAJISHIDADAOSUOXIWANGDEYINSHUAPINZHIDEGUANJIAN。JINTIANKEGOUMAIDAODESIYINJIFENWEILIANGZHONGZHUYAOLEIXING:SHIYANSHIYUSHENGCHAN。MEIGELEIXINGYOUJINYIBUDEFENLEI,YINWEIMEIGEGONGSIXIWANGCONGSHIYANSHIYUSHENGCHANLEIXINGDEXIGAOYINSHUAJIDEDAOBUTONGDEXINGNENGSHUIPING。LIRU,YIGEGONGSIDEYANJIUYUKAIFABUMENSHIYONGSHIYANSHILEIXINGZHIZUOCHANPINYUANXING,ERSHENGCHANZEHUIYONGLINGYIZHONGLEIXING。HAIYOU,SHENGCHANYAOQIUKENENGBIANHUAHENDA,QUJUEYUCHANLIANG。YINWEIJIGUANGQIEGESHEBEISHIBUKENENGFENLEIDE,*HAOSHIXUANZEYUSUOXIWANGDEYINGYONGXIANGSHIYINGDESIYINJI。

意甲竞猜  ZAISHOUGONGHUOBANZIDONGXIGAOYINSHUAJIZHONG,XIGAOSHISHOUGONGDIFANGZAIMOBAN/SIWANGSHANG,ZHEISHIYINSHUAGUABAN(squeegee)CHUYUMOBANDELINGYIDUAN。ZAIZIDONGXIGAOYINSHUAJIZHONG,XIGAOSHIZIDONGFENPEIDE。ZAIYINSHUAGUOCHENGZHONG,YINSHUAGUABANXIANGXIAYAZAIMOBANSHANG,SHIMOBANDIMIANJIECHUDAODIANLUBANDINGMIAN。DANGGUABANZOUGUOSUOFUSHIDEZHENGGETUXINGQUYUZHANGDUSHI,XIGAOTONGGUOMOBAN/SIWANGSHANGDEKAIKONGYINSHUADAOHANPANSHANG。

意甲竞猜   ZAIXIGAOYIJINGCHENJIZHIHOU,SIWANGZAIGUABANZHIHOUMASHANGTUOKAI(snapoff),HUIDAOYUANDI。ZHEIGEJIANGEHUOTUOKAIJULISHISHEBEISHEJISUODINGDE,DAYUE0.020"~0.040"。TUOKAIJULIYUGUABANYALISHILIANGGEDADAOLIANGHAOYINSHUAPINZHIDEYUSHEBEIYOUGUANDEZHONGYAOBIANLIANG。

意甲竞猜  RUGUOMEIYOUTUOKAI,ZHEIGEGUOCHENGJIAOJIECHU(on-contact)YINSHUA。DANGSHIYONGQUANJINSHUMOBANHEGUADAOSHI,SHIYONGJIECHUYINSHUA。FEIJIECHU(off-contact)YINSHUAYONGYUROUXINGDEJINSHUSIWANG。

 GUABAN(squeegee)LEIXING

 刮板的磨损、压力和硬度决定印刷质量,应该仔细监测。对可接受的印刷品质,刮板边缘应该锋利和直线。刮板压力低造成遗漏和粗糙的边缘,而刮板压力高或很软的刮板将引起斑点状的(smeared)印刷,甚至可能损坏刮板和模板或丝网。过高的压力也倾向于从宽的开孔中挖出锡膏,引起焊锡圆角不够。
意甲竞猜 常见有两种刮板类型:橡胶或聚氨酯(polyurethane)刮板和金属刮板。当使用橡胶刮板时,使用70-90橡胶硬度计(durometer)硬度的刮板。当使用过高的压力时,渗入到模板底部的锡膏可能造成锡桥,要求频繁的底部抹擦。为了防止底部渗透,焊盘开口在印刷时必须提供密封(gasketing)作用。这取决于模板开孔壁的粗糙度。

意甲竞猜  JINSHUGUADAOYESHICHANGYONGDE。SUIZHEGENGMIJIANJUZUJIANDESHIYONG,JINSHUGUADAODEYONGLIANGZAIZENGJIA。TAMENYOUBUXIUGANGHUOHUANGTONGZHICHENG,JUYOUPINGDEDAOPIANXINGZHUANG,SHIYONGDEYINSHUAJIAODUWEI30~45°。YIXIEGUADAOTUYOURUNHUACAILIAO。YINWEISHIYONGJIAODIDEYALI,TAMENBUHUICONGKAIKONGZHONGWACHUXIGAO,HAIYINWEISHIJINSHUDE,TAMENBUXIANGXIANGJIAOGUABANNEIYANGRONGYIMOSUN,YINCIBUXUYAOFENGLI。TAMENBIXIANGJIAOGUABANCHENGBENGUIDEDUO,BINGKENENGYINQIMOBANMOSUN。

 SHIYONGBUTONGDEGUABANLEIXINGZAISHIYONGBIAOZHUNZUJIANHEMIJIAOZUJIANDEYINSHUADIANLUZHUANGPEI(PCA)ZHONGSHIYOUQUFENDE。XIGAOLIANGDEYAOQIUDUIMEIYIZHONGZUJIANYOUHENDADEBUTONG。MIJIANJUZUJIANYAOQIUBIBIAOZHUNBIAOMIANTIEZHUANGZUJIANSHAODEDUODEHANXILIANG。HANPANMIANJIHEHOUDUKONGZHIXIGAOLIANG。

  YIXIEGONGCHENGSHISHIYONGSHUANGHOUDUDEMOBANLAIDUIMIJIAOZUJIANHEBIAOZHUNBIAOMIANTIEZHUANGHANPANSHIYONGSHIDANGDEXIGAOSHULIANG。QITAGONGCHENGSHICAIYONGYIZHONGBUTONGDEFANGFA -TAMENSHIYONGBUXUYAOJINGCHANGFENGLIDEGENGJINGJIDEJINSHUGUADAO。YONGJINSHUGUADAOGENGRONGYIFANGZHIXIGAOCHENJILIANGDEBIANHUA,DANZHEIZHONGFANGFAYAOQIUGAILIANGDEMOBANKAIKONGSHEJILAIFANGZHIZAIMIJIANJUHANPANSHANGGUODUODEXIGAOCHENJI。ZHEIGEFANGFAZAIGONGYESHANGBIANDEGENGSHOUHUANYING,DANSHI,SHIYONGSHUANGHOUDUYINSHUADEXIANGJIAOGUABANYEHAIMEIYOUXIAOSHI。

 MOBAN(stencil)LEIXING

意甲竞猜   ZHONGYAODEYINSHUAPINZHIBIANLIANGBAOKUOMOBANKONGBIDEJINGDUHEGUANGJIEDU。BAOCUNMOBANKUANDUYUHOUDUDESHIDANGDEZONGHENGBI(aspectratio)SHIZHONGYAODE。TUIJIANDEZONGHENGBIWEI1.5。ZHEIDUIFANGZHIMOBANZUSAISHIZHONGYAO。YIBAN,RUGUOZONGHENGBIXIAOYU1.5,XIGAOHUIBAOLIUZAIKAIKONGNEI。CHULEZONGHENGBIZHIWAI,RUIPC-7525《MOBANSHEJIZHINAN》SUOTUIJIANDE,HAIYAOYOUDAYU0.66DEMIANJIBI(HANPANMIANJICHUYIKONGBIMIANJI)。IPC-7525KEZUOWEIMOBANSHEJIDEYIGELIANGHAOKAIDUAN。

 ZHIZUOKAIKONGDEGONGYIGUOCHENGKONGZHIKAIKONGBIDEGUANGJIEDUHEJINGDU。YOUSANZHONGCHANGJIANDEZHIZUOMOBANDEGONGYI:HUAXUEFUSHI、JIGUANGQIEGEHEJIACHENG(additive)GONGYI。

意甲竞猜  HUAXUEFUSHI(chemically etched)MOBAN

 JINSHUMOBANHEROUXINGJINSHUMOBANSHISHIYONGLIANGGEYANGXINGTUXINGTONGGUOCONGLIANGMIANDEHUAXUEYANMOLAISHIKEDE。ZAIZHEIGEGUOCHENGZHONG,SHIKEBUJINZAISUOXIWANGDECHUIZHIFANGXIANGJINXING,ERQIEZAIHENGXIANGYEYOU。ZHEIJIAOZUODIQIE(undercutting)- KAIKONGBIXIWANGDEJIAODA,ZAOCHENGEWAIDEHANXICHENJI。YINWEI50/50CONGLIANGMIANJINXINGSHIKE,QIJIEGUOSHIJIHUZHIXIANDEKONGBI,ZAIZHONGJIANYOUWEIWEISHALOUXINGDESHOUZHAI。

 YINWEIDIANSHIKEMOBANKONGBIKENENGBUPINGHUA,DIANPAOGUANG,YIGEWEISHIKEGONGYI,SHIDADAOPINGHUAKONGBIDEYIGEFANGFA。LINGYIGEDADAOJIAOPINGHUAKONGBIDEFANGFASHIDUNIECENG(nickelplating)。PAOGUANGHUOPINGHUADEBIAOMIANDUIXIGAODESHIFANGSHIHAODE,DANKENENGYINQIXIGAOYUEGUOMOBANBIAOMIANERBUZAIGUABANQIANGUNDONG。ZHEIGEWENTIKETONGGUOXUANZEXINGDIPAOGUANGKONGBIERBUSHIZHENGGEMOBANBIAOMIANLAIBIMIAN。DUNIEJINYIBUGAISHANPINGHUADUHEYINSHUAXINGNENG。KESHI,TAJIANXIAOLEKAIKONG,YAOQIUTUXINGDIAOZHENG

 JIGUANGQIEGE(laser-cut)MOBAN

 JIGUANGQIEGESHILINGYIZHONGJIANQU(subtractive)GONGYI,DANTAMEIYOUDIQIEWENTI。MOBANZHIJIECONGGerberSHUJUZHIZUO,YINCIKAIKONGJINGDUDEDAOGAISHAN。SHUJUKEANXUYAODIAOZHENGYIGAIBIANCHICUN。GENGHAODEGUOCHENGKONGZHIYEHUIGAISHANKAIKONGJINGDU。JIGUANGQIEGEMOBANDELINGYIGEYOUDIANSHIKONGBIKECHENGZHUIXING。HUAXUESHIKEDEMOBANYEKEYICHENGZHUIXING,RUGUOZHICONGYIMIANFUSHI,DANSHIKAIKONGCHICUNKENENGTAIDA。BANMIANDEKAIKOUSHAOWEIBIGUABANMIANDEDAYIDIANDEZHUIXINGKAIKONG(0.001"~0.002",CHANSHENGDAYUE2°DEJIAODU),DUIXIGAOSHIFANGGENGRONGYI。

意甲竞猜  JIGUANGQIEGEKEYIZHIZUOCHUXIAOZHI0.004"DEKAIKONGKUANDU,JINGDUDADAO0.0005",YINCIHENSHIHEYUCHAOMIJIANJU(ultra-fine-pitch)DEZUJIANYINSHUA。JIGUANGQIEGEDEMOBANYEHUICHANSHENGCUCAODEBIANYUAN,YINWEIZAIQIEGEQIJIANQIHUADEJINSHUBIANCHENGJINSHUZHA。ZHEIKENENGYINQIXIGAOZUSAI。GENGPINGHUADEKONGBIKETONGGUOWEISHIKELAICHANSHENG。JIGUANGQIEGEDEMOBANRUGUOMEIYOUYUXIANDUIXUYAOJIAOBODEQUYUJINXINGHUAXUEFUSHI,JIUBUNENGZHICHENGTAIJIESHIDUOJIMOBAN。JIGUANGYIGEYIGEDIQIEGEMEIYIGEKAIKONG,YINCIMOBANCHENGBENSHIYAOQIEGEDEKAIKONGSHULIANGERDING。

 DIANZHUCHENGXING(electroformed)MOBAN

意甲竞猜  ZHIZUOMOBANDEDISANZHONGGONGYISHIYIZHONGJIACHENGGONGYI,*PUBIANDIJIAOZUODIANZHUCHENGXING。ZAIZHEIGEGONGYIZHONG,NIECHENJIZAITONGZHIDEYINJIXINSHANGYIXINGCHENGKAIKONG。YIZHONGGUANGMINGANJIAOPIANDIECENGZAITONGBOSHANG(DAYUE0.25"HOUDU)。JIAOPIANYONGZIWAIGUANGTONGGUOYOUMOBANTUANDEZHEGUANGMOJINXINGJUHE。JINGGUOXIANYINGHOU,ZAITONGZHIXINSHANGCHANSHENGYINJITUAN,ZHIYOUMOBANKAIKONGBAOCHIYONGGUANGKEJIAO(photoresist)FUGAI。RANHOUZAIGUANGKEJIAODEZHOUWEITONGGUODUNIEXINGCHENGLEMOBAN。ZAIDADAOSUOXIWANGDEMOBANHOUDUHOU,BAGUANGKEJIAOCONGKAIKONGCHUDIAO。DIANZHUCHENGXINGDENIEBOTONGGUOWANQUCONGTONGXINSHANGFENKAI- YIGEGUANJIANDEGONGYIBUZHOU。XIANZAIBOPIANZHUNBEIHAOZHUANGKUANG,ZHIZUOMOBANDEQITABUZHOU。

意甲竞猜  DIANZHUCHENGXINGTAIJIESHIMOBANKEYIZUODEDAO,DANCHENGBENZENGJIA。YOUYUKEDADAOJINGMIDEGONGCHA,DIANZHUCHENGXINGDEMOBANTIGONGLIANGHAODEMIFENGZUOYONG,JIANSHAOLEMOBANDIMIANDEXIGAOSHENLOU。ZHEIYIWEIZHEMOBANDIMIANCASHIDEPINLVXIANZHEDIJIANGDI,JIANSHAOQIANZAIDEXIQIAO。

 JIELUN

 HUAXUEFUSHIHEJIGUANGQIEGESHIZHIZUOMOBANDEJIANQUGONGYI。HUAXUESHIKEGONGYISHI*LAODE、SHIYONG*GUANGDE。JIGUANGQIEGEXIANGDUIJIAOXIN,ERDIANZHUCHENGXINGMOBANSHI*XINSHIXINGDEDONGXI。

 为了达到良好的印刷结果,必须有正确的锡膏材料(黏度、金属含量、*大粉末尺寸和尽可能*低的助焊剂活性)、正确的工具(锡膏印刷机、模板和刮刀)和正确的工艺过程(良好的定位、清洁拭擦)的结合。

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