Chifukwa ndi Kuthetsa kwa PCB Board Deformation

PCB kupotoza ndi vuto wamba PCBA misa kupanga, amene adzakhala ndi zotsatira ndithu pa msonkhano ndi kuyezetsa, chifukwa pakompyuta dera ntchito kusakhazikika, dera lalifupi dera / lotseguka dera kulephera.

Zomwe zimayambitsa PCB deformation ndi izi:

1. Kutentha kwa PCBA board kudutsa ng'anjo

Ma board ozungulira osiyanasiyana amakhala ndi kulekerera kutentha kwakukulu.Pamene areflow uvunikutentha ndipamwamba kwambiri, kupitirira mtengo wapatali wa bolodi lozungulira, zidzachititsa kuti bolodilo lifewetse ndikuyambitsa mapindikidwe.

2. Chifukwa cha bolodi PCB

Kutchuka kwa teknoloji yopanda chitsogozo, kutentha kwa ng'anjo ndipamwamba kuposa kutsogolera, ndipo zofunikira za teknoloji ya mbale ndizokwera kwambiri.Kutsika kwa mtengo wa TG, m'pamenenso gulu lozungulira lidzawonongeka mosavuta pa ng'anjo.Mtengo wa TG ukakwera, bolodi idzakhala yokwera mtengo kwambiri.

3. PCBA bolodi kukula ndi chiwerengero cha matabwa

Pamene gulu la dera lathamakina owotcherera reflow, nthawi zambiri amaikidwa mu unyolo kuti atumize, ndipo maunyolo kumbali zonse ziwiri amakhala ngati mfundo zothandizira.Kukula kwa bolodi lozungulira ndi lalikulu kwambiri kapena kuchuluka kwa matabwa kumakhala kokulirapo, zomwe zimapangitsa kukhumudwa kwa bolodi loyang'ana pakati, zomwe zimapangitsa kuti pakhale kusintha.

4. Makulidwe a bolodi la PCBA

Ndi chitukuko cha zinthu zamagetsi molunjika kwa zazing'ono ndi zoonda, makulidwe a bolodi la dera akukhala ochepa kwambiri.The woonda dera bolodi ndi, n'zosavuta chifukwa mapindikidwe a bolodi mchikakamizo cha kutentha pamene reflow kuwotcherera.

5. Kuya kwa v-kudula

V-kudula kudzawononga kamangidwe ka bolodi.V-kudula kudzadula grooves pa pepala lalikulu loyambirira.Ngati mzere wa V-odulidwa ndi wozama kwambiri, kusinthika kwa bolodi la PCBA kudzayambitsidwa.
Mfundo kugwirizana zigawo pa bolodi PCBA

Lero dera bolodi ndi Mipikisano wosanjikiza bolodi, pali zambiri kugwirizana pobowola kugwirizana, mfundo kugwirizana awa anawagawa kudzera dzenje, dzenje akhungu, kukwiriridwa dzenje mfundo, mfundo kugwirizana izi kuchepetsa zotsatira za kukulitsa matenthedwe ndi chidule cha bolodi dera. , zomwe zimabweretsa kusinthika kwa bolodi.

Zothetsera:

1. Ngati mtengo ndi malo zilola, sankhani PCB yokhala ndi Tg yayikulu kapena onjezerani makulidwe a PCB kuti mupeze chiyerekezo chabwino kwambiri.

2. Kupanga PCB momveka bwino, malo azitsulo zazitsulo ziwiri ayenera kukhala bwino, ndipo wosanjikiza wamkuwa ayenera kuphimbidwa pomwe palibe dera, ndikuwoneka ngati grid kuti awonjezere kuuma kwa PCB.

3. PCB imaphikidwa kale pamaso pa SMT pa 125 ℃/4h.

4. Sinthani fixture kapena clamping mtunda kuonetsetsa danga PCB Kutentha kukula.

5. kuwotcherera ndondomeko kutentha otsika momwe ndingathere;Kupotoka pang'ono kwawonekera, kumatha kuyikidwa muzoyikapo, kukonzanso kutentha, kumasula kupsinjika, zotsatira zokhutiritsa zidzakwaniritsidwa.