Kudzera Njira mu Multilayer PCB Fabrication

Vias ndi chimodzi mwa zigawo zofunika kwambirikupanga multilayer PCB, ndipo mtengo wakubowola nthawi zambiri umatengera 30% mpaka 40% ya mtengo waPCB chitsanzo.Bowo lobowoleredwa pa laminate ya mkuwa.Imanyamula ma conduction pakati pa zigawo ndipo imagwiritsidwa ntchito polumikizira magetsi ndi kukonza zida.mphete.

Kuchokera pakupanga multilayer PCB, vias amagawidwa m'magulu atatu, omwe ndi mabowo, mabowo okwiriridwa ndi maenje.Popanga ndi kupanga ma PCB ambiri, zodziwika bwino kudzera munjira zimaphatikizapo kudzera pamafuta ophimba, kudzera pamafuta a pulagi, kudzera pakutsegula zenera, dzenje la pulagi ya utomoni, kudzaza dzenje la electroplating, ndi zina. Njira iliyonse ili ndi mawonekedwe ake.

1. Pogwiritsa ntchito mafuta ophimba

"Mafuta" amafuta opangira chivundikiro amatanthauza mafuta a chigoba cha solder, ndipo mafuta ophimba ndi bowo ndikuphimba mphete ya dzenje ndi inki ya solder mask.Cholinga cha mafuta ophimba ndi kutsekereza, kotero ndikofunikira kuwonetsetsa kuti chivundikiro cha inki cha mphete ya dzenje ndi chodzaza komanso chokhuthala mokwanira, kuti malata asamamatire pachigambacho ndi DIP pambuyo pake.Dziwani kuti ngati fayiloyo ndi PADS kapena Protel, ikatumizidwa ku fakitale yopanga ma PCB ambiri kudzera pamafuta ophimba, muyenera kuyang'ana mosamala ngati plug-in dzenje (PAD) imagwiritsa ntchito, ndipo ngati, dzenje la pulagi lidzakutidwa ndi mafuta obiriwira ndipo silingathe kuwotcherera.

2. Kudzera pa zenera

Palinso njira ina yothanirana ndi "kudzera mafuta ophimba" pamene dzenje latsegulidwa.The via hole ndi grommet sayenera yokutidwa ndi solder chigoba mafuta.Kutsegula kwa dzenje kudzawonjezera malo otenthetsera kutentha, komwe kumapangitsa kuti pakhale kutentha.Choncho, ngati zofunikira zowonongeka kwa bolodi ndizokwera kwambiri, kutsegula kwa dzenje kungasankhidwe.Komanso, ngati mukufuna kugwiritsa ntchito multimeter kuchita ntchito muyeso pa vias pa multilayer PCB kupanga, ndiye kupanga vias lotseguka.Komabe, pali chiopsezo chotsegula kudzera pa dzenje - ndizosavuta kupangitsa kuti pad ifupikitsidwe ku malata.

3. Kudzera pulagi mafuta

Pogwiritsa ntchito plugging mafuta, ndiye kuti, PCB ya multilayer ikakonzedwa ndikupangidwa, inki ya solder imalumikizidwa koyamba mu dzenje ndi pepala la aluminiyamu, kenako mafuta a chigoba cha solder amasindikizidwa pa bolodi lonse, ndi mabowo onse. sichidzatumiza kuwala.Cholinga ndi kutsekereza vias kuteteza malata mikanda kubisala mu mabowo, chifukwa malata mikanda adzayenderera kwa ziyangoyango pamene iwo kusungunuka pa kutentha kwambiri, kuchititsa madera yochepa, makamaka pa BGA.Ngati ma vias alibe inki yoyenera, m'mphepete mwa mabowowo amasanduka ofiira, chifukwa "kukhudzana ndi mkuwa wabodza" kuli koipa.Kuphatikiza apo, ngati mafuta obowola kudzera pabowo sachitika bwino, amakhudzanso mawonekedwe.

4. Utomoni pulagi dzenje

Bowo la pulagi la utomoni limangotanthauza kuti khoma la dzenje litakutidwa ndi mkuwa, dzenjelo limadzazidwa ndi utomoni wa epoxy, ndiyeno mkuwa umakutidwa pamwamba.Cholinga cha dzenje la pulagi ya utomoni ndikuti payenera kukhala plating yamkuwa mu dzenjelo.Ichi ndi chifukwa ntchito utomoni pulagi mabowo PCBs zambiri ntchito BGA mbali.Traditional BGA angagwiritse ntchito kudzera pakati PAD ndi PAD njira mawaya kumbuyo.Komabe, ngati BGA ndi wandiweyani kwambiri ndi Via sangathe kutuluka, akhoza mokhomerera mwachindunji PAD.Chitani Via kupita kuchipinda china kuti muyendetse zingwe.Pamwamba pa multilayer PCB kupanga ndi utomoni pulagi dzenje ndondomeko alibe mano, ndipo mabowo akhoza anatsegula popanda kukhudza soldering.Chifukwa chake, imayamikiridwa pazinthu zina zokhala ndi zigawo zapamwamba komansomatabwa wandiweyani.

5. Electroplating ndi kudzaza dzenje

Electroplating ndi kudzazidwa zikutanthauza kuti vias wodzazidwa ndi electroplated mkuwa pa multilayer PCB nsalu, ndi pansi pa dzenje ndi lathyathyathya, amene si abwino kamangidwe ka mabowo zakhala zikuchulukirachulukira ndikudzera mu mapepala, komanso zimathandiza kuti magetsi azigwira bwino ntchito, kuchepetsa kutentha, komanso kudalirika.