Malangizo a PCB Rework kumapeto kwa SMT PCBA

Kusintha kwa PCB

 

Pambuyo kuyendera PCBA anamaliza, ndi chilema PCBA ayenera kukonzedwa.Kampaniyo ili ndi njira ziwiri zokonzetseraSMT PCBA.

Mmodzi ndi kugwiritsa ntchito nthawi zonse kutentha soldering chitsulo (kuwotcherera pamanja) kukonza, ndipo wina ndi ntchito workbench kukonza (kuwotcherera mpweya otentha) kukonza.Ziribe kanthu kuti ndi njira iti yomwe imatengedwa, pamafunika kupanga mgwirizano wabwino wa solder mu nthawi yochepa kwambiri.

Choncho, pogwiritsira ntchito chitsulo chosungunula, m'pofunika kuti mutsirize malo osungiramo masekondi osachepera 3, makamaka masekondi a 2.

M'mimba mwake wa waya wogulitsira kumafuna patsogolo kuti agwiritse ntchito m'mimba mwake φ0.8mm, kapena kugwiritsa ntchito φ1.0mm, osati φ1.2mm.

Kutentha kwachitsulo chowotchera: waya wowotcherera wabwinobwino mpaka magiya 380, waya wowotcherera wotentha kwambiri mpaka magiya 420.

Ferrochrome rework njira ndi kuwotcherera pamanja

1. Kuchiza kwachitsulo chatsopanocho musanagwiritse ntchito:

Chitsulo chatsopano cha soldering chingagwiritsidwe ntchito kawirikawiri pambuyo poti nsonga yachitsulo yosungunuka itayikidwa ndi wosanjikiza wa solder musanagwiritse ntchito.Chitsulo cha soldering chikagwiritsidwa ntchito kwa nthawi, chitsulo cha oxide chidzapangidwa pamwamba ndi kuzungulira tsamba la nsonga yachitsulo, zomwe zingayambitse "kudya malata".Panthawiyi, wosanjikiza wa oxide ukhoza kusungidwa, ndipo solder ikhoza kuikidwanso.

 

2. Momwe mungagwirire chitsulo chosungunulira:

Reverse grip: Gwiritsani ntchito zala zisanu kuti mugwire chogwirira chachitsulo m'manja mwanu.Njirayi ndi yoyenera zitsulo zopangira magetsi zamphamvu kwambiri kuti ziwotcherera zigawo zomwe zimakhala ndi kutentha kwakukulu.

Kugwira kwachitsulo: Gwirani chogwirira chachitsulo chosungunulira ndi zala zinayi kupatula chala chachikulu, ndipo kanikizani chala chachikulu motsatira chitsulo chosungunulira.Chitsulo chogulitsira chomwe chimagwiritsidwa ntchito mwanjira imeneyi chimakhalanso chachikulu, ndipo ambiri aiwo ndi nsonga zachitsulo zopindika.

Njira yogwirizira cholembera: Kugwirizira chitsulo chamagetsi chamagetsi, monga kugwirizira cholembera, ndikoyenera zitsulo zamagetsi zochepera mphamvu zochepa kuti ziwotcherera tizigawo ting'onoting'ono towotcherera.

 

3. Njira zowotcherera:

Panthawi yowotcherera, zidazo ziyenera kuyikidwa bwino, ndipo chitsulo chopangira magetsi chiyenera kukhala chogwirizana.Nthawi zambiri, ndi bwino kugwiritsa ntchito waya wa solder wokhala ndi chubu wokhala ndi rosin powotchera.Gwirani chitsulo chogulitsira m'dzanja limodzi ndi waya wogulitsira m'dzanja lina.

Sungunulani nsonga yachitsulo Kutenthetsa nsonga Sungunulani solder Sunthani nsonga yachitsulo Chotsani chitsulo chosungunulira.

① Gwirani mwachangu nsonga yachitsulo chotenthetsera ndi malata ku waya wopindika, kenaka gwirani malo olumikizirana, gwiritsani ntchito solder wosungunula kuti muthandizire kutentha koyambilira kuchokera kuchitsulo kupita ku chogwirira ntchito, ndiyeno sunthani waya wa solder kuti mulumikizane ndi soldering Pamwamba pa nsonga yachitsulo chosungunuka.

②Lumikizanani ndi nsonga yachitsulo chogulitsira ku pini/pad, ndikuyika waya wolumikizira pakati pa nsonga yachitsulo ndi pini kuti mupange mlatho wotentha;ndiye mwamsanga sunthani waya wa soldering kumbali ina ya malo osungiramo.

Komabe, nthawi zambiri amayamba chifukwa cha kutentha kosayenera, kupanikizika kwambiri, nthawi yosungirako nthawi yaitali, kapena kuwonongeka kwa PCB kapena zigawo zikuluzikulu zomwe zimayambitsidwa ndi atatu pamodzi.

 

4. Njira zodzitetezera pakuwotcherera:

Kutentha kwa nsonga yachitsulo cha soldering kuyenera kukhala koyenera.Kutentha kosiyanasiyana kwazitsulo zachitsulo kumatulutsa zochitika zosiyanasiyana zikayikidwa pa chipika cha rosin.Nthawi zambiri, kutentha pamene rosini amasungunuka mofulumira ndipo samatulutsa utsi ndikoyenera.

Nthawi ya soldering iyenera kukhala yoyenera, kuyambira kutenthetsa chophatikizira cha solder mpaka kusungunuka kwa solder ndi kudzaza chophatikizira cha solder, kawirikawiri chiyenera kutsirizidwa mkati mwa masekondi angapo.Ngati nthawi ya soldering ndi yayitali kwambiri, kusinthasintha kwazitsulo za solder kudzakhala kosavuta, ndipo zotsatira zowonongeka zidzatayika.

Ngati nthawi ya soldering ndi yochepa kwambiri, kutentha kwa soldering point sikudzafika pa kutentha kwa soldering, ndipo solder sichidzasungunuka mokwanira, zomwe zingayambitse mosavuta kutsekemera kwabodza.

Kuchuluka kwa solder ndi flux ziyenera kugwiritsidwa ntchito moyenera.Nthawi zambiri, kugwiritsa ntchito solder wambiri kapena wocheperako komanso kutulutsa pagulu la solder kudzakhala ndi zotsatira zabwino pamtundu wa soldering.

Pofuna kupewa solder pa solder joint kuti asayende mwachisawawa, soldering yabwino iyenera kukhala kuti solder imangogulitsidwa kumene imayenera kugulitsidwa.Mu ntchito ya soldering, solder iyenera kukhala yocheperapo pachiyambi.Pamene solder ikufika pa kutentha kwa soldering ndipo solder imalowa mumtsinje wa soldering point, solder idzawonjezeredwa kuti amalize kugulitsa mofulumira.

Musakhudze zida za solder panthawi ya soldering.Pamene solder pamalumikizidwe a solder sanakhazikike kwathunthu, zida zogulitsira ndi mawaya pamalumikizidwe a solder zisasunthike, apo ayi zida za solder zidzapunduka ndipo kuwotcherera pafupifupi kudzachitika.

Osawotcha zigawo zozungulira ndi mawaya.Pamene soldering, samalani kuti scald pulasitiki kutchinjiriza wosanjikiza wa mawaya ozungulira ndi pamwamba pa zigawo zikuluzikulu, makamaka kwa mankhwala ndi yopangidwa kuwotcherera yaying'ono ndi akalumikidzidwa zovuta.

Chitani ntchito yoyeretsa mutatha kuwotcherera nthawi.Kuwotcherera kukamalizidwa, waya wodulidwa mutu ndi malata slag anagwetsa pa kuwotcherera ayenera kuchotsedwa mu nthawi kuteteza zoopsa zobisika kugwera mu mankhwala.

 

5. Chithandizo pambuyo kuwotcherera:

Pambuyo kuwotcherera, muyenera kuyang'ana:

Kaya palibe solder.

Kodi gloss ya ma solder joints ndiyabwino?

Mgwirizano wa solder ndi wosakwanira.

Kaya pali kusinthasintha kotsalira kuzungulira ma solder.

Kaya pali kuwotcherera mosalekeza.

Kaya pad wagwa.

Kaya pali ming'alu pamagulu a solder.

Kodi cholumikizira cha solder ndi chosagwirizana?

Kaya zolumikizira za solder ndi zakuthwa.

Kokani gawo lililonse ndi tweezers kuti muwone ngati pali kumasuka.

 

6. Desoldering:

Pamene soldering chitsulo nsonga ndi usavutike mtima ndi desoldering mfundo, mwamsanga pamene solder amasungunula, kutsogolera chigawo chimodzi ayenera anakokedwa mu malangizo perpendicular kwa bolodi dera mu nthawi.Kaya unsembe udindo wa chigawo chimodzi, kaya n'zosavuta kuchotsa, musakakamize kapena kupotoza chigawocho.Kuti musawononge bolodi la dera ndi zigawo zina.

Musagwiritse ntchito mphamvu mopitirira muyeso pamene desoldering.Chizoloŵezi choyang'ana ndi kugwedeza kukhudzana ndi chitsulo chosungunuka chamagetsi ndi choipa kwambiri.Nthawi zambiri, kukhudzana sikuloledwa kuchotsedwa ndi kukoka, kugwedeza, kupotoza, etc.

Musanalowetse chigawo chatsopano, solder mu dzenje la waya ayenera kutsukidwa, mwinamwake pad ya bolodi la dera idzagwedezeka pamene ikulowetsa chigawo chatsopano.