Zifukwa zakugwa ndi mafuta obiriwira pakulimbana ndi kuwotcherera kwa board ndi zovuta zomwe zimayambitsidwa ndi mafuta obiriwira obiriwira kwambiri

Nthawi zambiri, timawona kanema wobiriwira pamwamba pa bolodi. M’malo mwake, ili ndiye dera lomwe solder amakana inki. Amasindikizidwa pa PCB makamaka kuti ateteze kuwotcherera, motero amatchedwanso solder kukana inki. Ma solder omwe amapezeka kwambiri ku PCB amakana inki ndi obiriwira, buluu, oyera, akuda, achikasu ndi ofiira, komanso mitundu ina yosowa. Mzere wambiri wa inki umatha kuphimba ma conductor osayembekezereka kupatula ziyangoyango, pewani kuwotcherera dera lalifupi ndikuwonjezera moyo wa PCB mukamagwiritsa ntchito; Nthawi zambiri amatchedwa kukana kuwotcherera kapena odana ndi kuwotcherera; Komabe, pokonza PCB, pamakhala mavuto ambiri nthawi ndi nthawi, ndipo vuto limodzi lomwe limafala kwambiri ndikutsika kwa solder kukana mafuta obiriwira pa board board. Kodi chifukwa chotsitsira inki pa bolodi ladera ndi chiyani?

Pali zifukwa zitatu zazikulu zakugwa kwa mafuta obiriwira osakanikirana ndi bolodi la dera:

Imodzi ndikuti mukasindikiza inki pa PCB, prereatment siyichitidwe m’malo. Mwachitsanzo, pamakhala madontho, fumbi kapena zosafunika pamtunda wa PCB, kapena madera ena amaphatikizidwa. M’malo mwake, njira yosavuta yothanirana ndi vutoli ndikuyambiranso, koma yesetsani kuyeretsa zipsinjo, zosafunika kapena osanjikiza pa oxide pamwamba pa PCB;

Chifukwa chachiwiri ndichakuti mwina chifukwa choti bolodi lophika limaphikidwa mu uvuni kwakanthawi kochepa kapena kutentha sikokwanira, chifukwa komiti yoyendetsa dera iyenera kuphikidwa pakatentha kwambiri mukasindikiza inki ya thermosetting. Ngati kutentha kapena kuphika sikokwanira, mphamvu ya inki pa bolodiyo siyikhala yokwanira, ndipo pamapeto pake kulimbikira kwa boarding kudzagwa.

Chifukwa chachitatu ndi vuto la inki kapena kutha kwa inki. Zifukwa ziwirizi zimapangitsa inki yomwe ili pa board board kugwa. Kuti tithetse vutoli, titha kungotengera wogulitsa inki.

Mulingo wa IPC wama board board sakunena kukula kwake kwamafuta obiriwira. Nthawi zambiri, makulidwe amafuta obiriwira pamzere amalamulidwa pa 10-35um; Ngati mafuta obiriwira ndi ochepa kwambiri komanso okwera kwambiri kuposa pad, padzakhala zoopsa ziwiri zobisika:

Choyamba ndikuti makulidwe ambale amapitilira muyeso. Olemera kwambiri wobiriwira mafuta makulidwe adzatsogolera mbale makulidwe ndi wandiweyani, amene ndi ovuta kukhazikitsa kapena ngakhale sangathe ntchito;

Chachiwiri, mauna achitsulo amatenthedwa ndi mafuta obiriwira nthawi ya SMT, ndipo makulidwe a phala la solder lomwe limasindikizidwa pa pad ndi chotumphuka, chomwe chimakhala chosavuta kuyambitsa dera lalifupi pakati pazikhomo mutatha kuwotcherera.