Zifukwa zowotcherera za SMT
1. PCB pad kapangidwe zolakwika
Mu kapangidwe ka PCB ena, chifukwa danga ndi laling'ono, dzenje likhoza kuseweredwa pa pedi, koma solder phala ali fluidity, amene akhoza kudutsa mu dzenje, chifukwa palibe solder phala mu kuwotcherera reflow, kotero pini ikasakwanira kudya malata, imatsogolera ku kuwotcherera pafupifupi.
2.Pad pamwamba makutidwe ndi okosijeni
Mukakonzanso pad yokhala ndi okosijeni, kuwotchereranso kumabweretsa kuwotcherera, kotero kuti padyo ikawotchera, imayenera kuumitsa kaye. Ngati oxidation ndi yayikulu, iyenera kusiyidwa.
Kutentha kwa 3.Reflow kapena nthawi yotentha ya zone sikokwanira
Chigambacho chikamalizidwa, kutentha sikokwanira podutsa malo otenthetsera kutentha kwa reflow ndi kutentha kosalekeza, zomwe zimapangitsa kuti tinthu tating'onoting'ono tomwe tisungunuke tomwe si timene titalowa m'malo otentha kwambiri, zomwe zimabweretsa kudya kwa malata osakwanira. a chigawo pini, kuchititsa pafupifupi kuwotcherera.
4.Solder phala kusindikiza ndi zochepa
Pamene solder phala ndi brushed, mwina chifukwa cha mipata ang'onoang'ono mu mauna zitsulo ndi kupanikizika kwambiri kwa scraper kusindikiza, kuchititsa zochepa solder phala kusindikiza ndi volatilization mofulumira wa solder phala kwa reflow kuwotcherera, chifukwa mu kuwotcherera pafupifupi.
5.Zida zapamwamba kwambiri
Pamene chipangizo chokhala ndi pini yapamwamba ndi SMT, zikhoza kukhala kuti pazifukwa zina, chigawocho ndi chopunduka, bolodi la PCB likupindika, kapena kupanikizika koipa kwa makina oyika sikukwanira, zomwe zimapangitsa kusungunuka kosiyanasiyana kwa solder, zomwe zimapangitsa kuwotcherera pafupifupi.
Zifukwa zowotcherera za DIP
1.PCB pulagi-mu dzenje mapangidwe zolakwika
PCB pulagi-mu dzenje, kulolerana ndi pakati ± 0.075mm, PCB ma CD dzenje ndi lalikulu kuposa pini ya chipangizo thupi, chipangizo adzakhala lotayirira, kuchititsa malata osakwanira, kuwotcherera pafupifupi kapena kuwotcherera mpweya ndi mavuto ena khalidwe.
2.Pad ndi dzenje makutidwe ndi okosijeni
Mabowo a PCB ndi odetsedwa, okosijeni, kapena kuipitsidwa ndi zinthu zabedwa, mafuta, madontho a thukuta, ndi zina zambiri, zomwe zingapangitse kuti pakhale kuwotcherera bwino kapena kusakhala ndi weldability, zomwe zimapangitsa kuwotcherera pafupifupi ndi kuwotcherera mpweya.
3.PCB bolodi ndi chipangizo khalidwe zinthu
Nagula matabwa PCB, zigawo zikuluzikulu ndi solderability ena si oyenerera, palibe mayeso okhwima kuvomereza wachitika, ndipo pali mavuto khalidwe monga kuwotcherera pafupifupi pa msonkhano.
4.PCB bolodi ndi chipangizo inatha
Nagula PCB matabwa ndi zigawo zikuluzikulu, chifukwa kuwerengera nthawi yaitali kwambiri, anakhudzidwa ndi malo osungiramo katundu, monga kutentha, chinyezi kapena mpweya zikuwononga, chifukwa mu kuwotcherera zochitika monga kuwotcherera pafupifupi.
5.Wave soldering zida zinthu
The mkulu kutentha mu yoweyula kuwotcherera ng'anjo kumabweretsa inapita patsogolo makutidwe ndi okosijeni wa zinthu solder ndi pamwamba pa zinthu m'munsi, chifukwa mu kuchepetsedwa adhesion wa pamwamba pa madzi solder zakuthupi. Kuphatikiza apo, kutentha kwambiri kumawononganso zinthu zoyambira pansi, zomwe zimapangitsa kuchepa kwa capillary komanso kusalumikizana bwino, zomwe zimapangitsa kuwotcherera.
Nthawi yotumiza: Jul-11-2023
