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回流焊工作原理
发布时间:2020-07-25

回流焊工作原理

(1) 回流焊工艺的目的

HUILIUHANSHIZHITONGGUOZHONGXINRONGHUAYUXIANFENPEIDAOPCBHANPANSHANGDEGAOZHUANGRUANQIANHANLIAO,SHIXIANBIAOMIANZUZHUANGYUANQIJIANHANDUANHUOYINJIAOYUPCBHANPANZHIJIANJIXIEYUDIANQILIANJIEDERUANQIANHAN。HUILIUHANGONGYISUOCAIYONGDEHUILIUHANJICHUYUSMTSHENGCHANXIANDEMODUAN。 

HUILIUHANGONGYIZHUYAOYOULIANGFANGMIANDEMUDE:

1) ZHENDUIYINXIBAN(GONGYILIUCHENGWEIHANXIGAO-HUILIUHANGONGYI),MUDESHIJIARERONGHUAHANXIGAO,JIANGYUANQIJIANDEYINJIAOHUOHANDUANTONGGUORONGHUADEHANXIGAOYUPCBHANPANJINXINGHANJIE,XINGCHENGDIANQILIANJIEDIAN。

2) ZHENDUIDIANJIAOBAN(GONGYILIUCHENGWEITIEPIAN-BOFENGHANGONGYI),MUDESHIJIAREGUHUASMTTIEPIANJIAO,JIANGYUANQIJIANBENTIDIBUDETIEPIANJIAOYUPCBDUIYINGDEWEIZHIJINXINGZHANJIEGUDING。

(2) 回流焊工艺的特点:

1) YUANQIJIANBUZHIJIEJINZIZAIRONGRONGDEHANLIAOZHONG,YINCIYUANQIJIANSHOUDAODERECHONGJIXIAO。

2) NENGZAIQIANDAOGONGXULIKONGZHIHANLIAODESHIJIALIANG,JIANSHAOLEXUHAN、QIAOJIEDENGHANJIEQUEXIAN,YINCIHANJIEZHILIANGHAO、HANDIANDEYIZHIXINGHAO,KEKAOXINGGAO。

3) JIARUQIANDAOGONGXUZAIPCBSHANGSHIFANGHANLIAODEWEIZHIZHENGQUEERTIEFANGYUANQIJIANDEWEIZHIYOUYIDINGPIANLI,ZEZAIHUILIUHANGUOCHENGZHONG,DANGYUANQIJIANDEQUANBUHANDUAN、YINJIAOJIQIXIANGYINGDEHANPANTONGSHIRUNSHISHI,YOUYURONGRONGHANLIAOBIAOMIANZHANGLIDEZUOYONG,CHANSHENGZIDINGWEIXIAOYING,NENGGOUZIDONGXIAOZHENGPIANCHA,BAYUANQIJIANLAHUIDAOJINSIZHUNQUEDEWEIZHI。

4) HUILIUHANDEHANLIAOSHISHANGPINHUADEHANXIGAO,NENGGOUBAOZHENGZHENGQUEDEZUFEN,BANBUHUIHUNRUZAZHI。

5) KEYICAIYONGJUBUJIAREDEREYUAN,YINCINENGZAITONGYIJIBANSHANGCAIYONGBUTONGDEHANJIEFANGFAJINXINGHANJIE。

6) GONGYIJIANDAN,FANXIUDEGONGZUOLIANGHENXIAO。

(3) 回流焊工艺的基本过程:一般的,一个完整的回流焊工艺基本流程需要经过基板传送、预热、保温、回流、冷却等工序。

KONGZHIYUDIAOZHENGHUILIUHANSHEBEINEIHANJIEDUIXIANGZAIJIAREGUOCHENGZHONGDESHIJIANYIWENDUCANSHUGUANXI(JIANCHENGHANJIEWENDUQUXIAN),SHIJUEDINGHUILIUHANXIAOGUOYUZHILIANGDEGUANJIAN。

 回流焊工艺流程图.jpg

HUILIUHANDEJIAREGUOCHENGKEYIFENCHENGYURE、HANJIEHELENGQUESANGEZUIJIBENDEWENDUQUYU,ZHUYAOYOULIANGZHONGSHIXIANFANGFA:YIZHONGSHIYANZHECHUANSONGXITONGDEYUNXINGFANGXIANG,RANGPCBSHUNXUTONGGUOSUIDAOSHILUNEIDEGEGEWENDUQUYU;LINGYIZHONGSHIBAPCBTINGFANGZAIMOUYIGUDINGWEIZHISHANG,ZAIKONGZHIXITONGDEZUOYONGXIA,ANZHAOGEGEWENDUQUYUDETIDUGUILV,DIAOJIE、KONGZHIWENDUDEBIANHUA。XIATUSUOSHIWEIHUILIUHANDELIXIANGHANJIEWENDUQUXIAN。

回流焊温度曲线.jpg

1) YUREQU:PCBZAI100~160℃DEWENDUXIAJUNYUNYURE2~3min,HANXIGAOZHONGDEDIFEIDIANRONGJIHEKANGYANGHUAJIHUIFA,HUACHENGYANQIPAICHU;TONGSHI,HANXIGAOZHONGDEZHUHANJIRUNSHI,HANXIGAORUANHUATALUO,FUGAIZHUHANPANHEYUANQIJIANDEHANDUANHUOYINJIAO,SHITAMENYUKONGQIGELI;BINGQIE,PCBHEYUANQIJIANDEDAOCHONGFENYURE,YIMIANTAMENJINRUHANJIEQUHOUYINWENDUTURANSHENGGAOERSUNHUAI。ZAIYUREQUDEBAOWENQU,WENDUWEICHIZAI150℃ZUOYOU,HANXIGAOZHONGDEHUOXINGJIKAISHIZUOYONG,QUCHUHANJIEDUIXIANGBIAOMIANDEYANGHUACENG。

2) HANJIEQU:WENDUZHUBUSHANGSHENG,CHAOGUOHANXIGAORONGDIANWENDU30%~40%(YIBANSn-PbHANXIDERONGDIANWEI183℃,BIRONGDIANGAO4~50℃),FENGZHIHANJIEWENDUZAI220~230℃ZHIJIANQIESHIJIANXIAOYU10s,GAOZHUANGHANLIAOZAIREKONGQIZHONGZAICIRONGRONG,RUNSHIYUANQIJIANHANDUANYUHANPAN,SHIJIANWEI60-90S,ZHEIGEFANWEIYIBANBEICHENGWEIGONGYICHUANGKOU。

3) LENGQUEQU:DANGHANJIEDUIXIANGCONGLUTANGNEIDELENGQUEQUTONGGUO,SHIHANLIAOLENGQUENINGGUYIHOU,QUANBUHANDIANTONGSHIWANCHENGHANJIE。

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