Njira ya SMT No-clean Rework

Mawu Oyamba.

Ntchito yokonzanso imanyalanyazidwa nthawi zonse ndi mafakitale ambiri, komabe zolephera zenizeni zomwe sizingapeweke zimapangitsa kukonzanso kofunikira pakukonza msonkhano.Choncho, kukonzanso kosatsutsika ndi gawo lofunika kwambiri la msonkhano weniweni wosayera.Nkhaniyi ikufotokoza kusankhidwa kwa zipangizo zomwe zimafunikila kuti pasakhalenso zoyera, kuyesa ndi njira zogwirira ntchito.

I. Palibe-zoyera rework ndi ntchito CFC kuyeretsa pakati kusiyana

Mosasamala kanthu za mtundu wanji wa kukonzanso cholinga chake ndi chimodzimodzi - mu msonkhano wadera wosindikizidwa pa kuchotsa kosawononga ndi kuyika kwa zigawo, popanda kukhudza ntchito ndi kudalirika kwa zigawozo.Koma ndondomeko yeniyeni ya kukonzanso kosayeretsedwa pogwiritsa ntchito CFC kukonzanso kukonzanso kumasiyana ndi kusiyana komwe kuli.

1. pogwiritsira ntchito CFC kukonzanso kukonzanso, zigawo zokonzedwanso kuti zidutse njira yoyeretsera, njira yoyeretsera nthawi zambiri imakhala yofanana ndi njira yoyeretsera yomwe imagwiritsidwa ntchito poyeretsa dera losindikizidwa pambuyo pa msonkhano.Kukonzanso kopanda kuyeretsa si njira yoyeretsera iyi.

2. mu ntchito CFC kuyeretsa rework, ntchito kuti tikwaniritse zolumikizira zabwino solder lonse zigawo reworked ndi kusindikizidwa dera bolodi dera ndi ntchito solder flux kuchotsa okusayidi kapena kuipitsidwa zina, pamene palibe njira zina kupewa kuipitsidwa ku magwero monga mafuta a chala kapena mchere, ndi zina zotero. Ngakhale mutakhala ndi solder ndi zowonongeka zina pa msonkhano wadera wosindikizidwa, ndondomeko yomaliza yoyeretsa idzachotsa.Komano, kukonzanso kosayera, kumayika zonse mumsonkhano wadera wosindikizidwa, zomwe zimapangitsa kuti pakhale mavuto osiyanasiyana monga kudalirika kwa nthawi yaitali kwazitsulo za solder, kugwirizanitsa ntchito, kuipitsidwa ndi zofunikira zodzikongoletsera.

Monga kukonzanso kopanda koyera sikudziwika ndi kuyeretsa, kudalirika kwa nthawi yayitali kwazitsulo za solder kungathe kutsimikiziridwa mwa kusankha zinthu zoyenera kukonzanso ndikugwiritsa ntchito njira yoyenera yopangira soldering.Popanda kuyeretsanso, solder flux iyenera kukhala yatsopano komanso nthawi yomweyo yogwira ntchito mokwanira kuti ichotse ma oxides ndikukwaniritsa wettability wabwino;zotsalira pa msonkhano wadera wosindikizidwa ziyenera kukhala zandale komanso zosakhudza kudalirika kwa nthawi yaitali;kuwonjezera apo, zotsalira pa msonkhano wadera wosindikizidwa ziyenera kugwirizana ndi zinthu za kukonzanso ndipo zotsalira zatsopano zopangidwa mwa kuphatikizika ndi zinzake ziyeneranso kukhala zosaloŵerera.Nthawi zambiri kutayikira pakati kondakitala, makutidwe ndi okosijeni, electromigration ndi kukula dendrite amayamba chifukwa zinthu zosagwirizana ndi kuipitsidwa.

Ubwino wa mawonekedwe amasiku ano ndi nkhani yofunikanso, popeza ogwiritsa ntchito amazolowera kukonda misonkhano yadera yoyera komanso yonyezimira, ndipo kupezeka kwa zotsalira zamtundu uliwonse pa bolodi kumawonedwa ngati kuipitsidwa ndikukanidwa.Komabe, zotsalira zowoneka zimakhala zachizoloŵezi chosayeretsedwa chokonzanso ntchito ndipo sizovomerezeka, ngakhale kuti zotsalira zonse kuchokera ku ndondomeko yokonzanso sizilowerera ndipo sizimakhudza kudalirika kwa msonkhano wadera wosindikizidwa.

Kuthetsa mavutowa pali njira ziwiri: mmodzi ndi kusankha bwino rework zakuthupi, palibe-oyera rework pambuyo khalidwe la olowa solder pambuyo kuyeretsa ndi CFC zabwino monga khalidwe;chachiwiri ndi kukonza njira panopa Buku rework ndi njira kukwaniritsa odalirika palibe soldering osayera.

II.Bwezeraninso kusankha zinthu ndi kuyanjana

Chifukwa cha kugwirizanitsa kwa zipangizo, ndondomeko yosonkhanitsa yosayera komanso ndondomeko yokonzanso imagwirizanitsidwa ndi kudalirana.Ngati zipangizo sizinasankhidwe moyenera izi zidzatsogolera ku kugwirizana komwe kungachepetse moyo wa mankhwala.Kuyesa kufananiza nthawi zambiri kumakhala ntchito yokhumudwitsa, yodula komanso yowononga nthawi.Izi ndichifukwa cha kuchuluka kwa zida zomwe zikukhudzidwa, zosungunulira zoyesera zokwera mtengo komanso njira zoyesera zopitilira nthawi yayitali ndi zina zambiri. Zida zomwe zimagwiritsidwa ntchito pakusokonekera zimagwiritsidwa ntchito m'malo akulu, kuphatikiza phala la solder, solder, zomatira ndi zokutira mawonekedwe.Njira yokonzanso, kumbali ina, imafuna zipangizo zowonjezera monga rework solder ndi solder waya.Zida zonsezi ziyenera kugwirizana ndi zotsukira zilizonse kapena mitundu ina ya zotsukira zomwe zimagwiritsidwa ntchito pambuyo pa kusindikizidwa kwa board board masking ndi solder phala misprinting.