Chifukwa cha PCB kugwa solder mbale

PCB dera bolodi mu ndondomeko kupanga, nthawi zambiri kukumana ndi zolakwika ndondomeko, monga PCB dera bolodi mkuwa waya zoipa (amakhalanso akuti kuponya mkuwa), zimakhudza mankhwala khalidwe.Zifukwa zodziwika za PCB board board kuponyera mkuwa ndi izi:

PCB dera bolodi ndondomeko zinthu

1, zojambula zamkuwa zamkuwa ndizochulukira, zojambula zamkuwa za electrolytic zomwe zimagwiritsidwa ntchito pamsika nthawi zambiri zimakhala ngati malata ambali imodzi (yomwe imadziwika kuti zojambulazo) ndi mkuwa wambali imodzi (yomwe imadziwika kuti zojambulazo zofiira), mkuwa wamba nthawi zambiri umakhala ngati malata opitilira 70um. zojambulajambula zamkuwa, zojambulazo zofiira ndi 18um pansi pa zojambulazo za phulusa sizinakhale mtanda wamkuwa.

2. Kugunda komweko kumachitika mu njira ya PCB, ndipo waya wamkuwa umalekanitsidwa ndi gawo lapansi ndi mphamvu yamakina akunja.Chilemachi chimawoneka ngati kusayika bwino kapena kupendekeka, waya wamkuwa wogwa umakhala ndi kupotoza koonekeratu, kapena mbali yomweyo ya kukanda/chizindikiro.Pewani mbali yoyipa ya waya wamkuwa kuti muwone zojambulazo zamkuwa, mutha kuwona mtundu wabwinobwino wa zojambulazo zamkuwa, sipadzakhala kukokoloka koyipa, kupukuta mphamvu zamkuwa ndizabwinobwino.

3, kapangidwe ka dera la PCB sikoyenera, kamangidwe kazojambula zamkuwa kamene kamakhala ndi mzere woonda kwambiri, kumayambitsanso mizere yochulukirapo komanso yamkuwa.

Laminate ndondomeko chifukwa

M'mikhalidwe yabwino, bola kutentha kukanikiza mkulu kutentha gawo la laminate kuposa mphindi 30, mkuwa zojambulazo ndi theka anachiritsa pepala kwenikweni pamodzi kotheratu, kotero kukanikiza zambiri sikungakhudze kumanga mphamvu ya zojambulazo mkuwa ndi gawo lapansi mu laminate.Komabe, mu ndondomeko ya laminate stacking ndi stacking, ngati PP kuipitsa kapena mkuwa zojambulazo pamwamba kuwonongeka, zidzachititsanso kusakwanira kugwirizana mphamvu pakati zojambulazo mkuwa ndi gawo lapansi pambuyo laminate, chifukwa poika (pokha mbale yaikulu) kapena sporadic waya wamkuwa. kutayika, koma kuvula mphamvu ya zojambulazo zamkuwa pafupi ndi mzere wovula sikudzakhala kwachilendo.

Laminate zopangira chifukwa

1, wamba electrolytic mkuwa zojambulazo ndi kanasonkhezereka kapena mkuwa yokutidwa mankhwala, ngati pachimake mtengo wa ubweya kupanga zojambulazo ndi zachilendo, kapena kanasonkhezereka/mkuwa plating, ❖ kuyanika dendritic zoipa, chifukwa mkuwa zojambulazo wokha peeling mphamvu sikokwanira, zoipa zojambulazo. mbamuikha bolodi zopangidwa PCB pulagi-mu fakitale zamagetsi, waya wamkuwa adzagwa ndi kukhudza kunja.Mtundu wa zoipa akuvula mkuwa waya mkuwa zojambulazo pamwamba (ndiko kukhudzana pamwamba ndi gawo lapansi) pambuyo zoonekeratu kukokoloka mbali, koma padziko lonse mkuwa zojambulazo peeling mphamvu adzakhala osauka.

2. Kusasinthika kosasinthika kwa zojambulazo zamkuwa ndi utomoni: ma laminates ena okhala ndi zinthu zapadera amagwiritsidwa ntchito tsopano, monga pepala la HTg, chifukwa cha machitidwe osiyanasiyana a utomoni, machiritso omwe amagwiritsidwa ntchito nthawi zambiri amakhala PN utomoni, utomoni utomoni utomoni utomoni dongosolo losavuta, otsika crosslinking digiri pamene. kuchiritsa, ntchito yapadera pachimake mkuwa zojambulazo ndi machesi.Pamene kupanga laminate ntchito mkuwa zojambulazo ndi dongosolo utomoni sizikufanana, chifukwa pepala zitsulo zojambulazo peeling mphamvu sikokwanira, pulagi-mu adzaoneka zoipa mkuwa waya kukhetsa.

Kuphatikiza apo, zitha kukhala kuti kuwotcherera kosayenera kwa kasitomala kumabweretsa kutayika kwa chowotcherera chowotcherera (makamaka mapanelo amodzi ndi awiri, matabwa a multilayer ali ndi malo ambiri pansi, kutentha kwachangu, kutentha kwa kuwotcherera ndikwambiri, sikophweka. kugwa):

Kuwotcherera mobwerezabwereza malo kumawotcherera pedi;

Kutentha kwakukulu kwachitsulo chosungunuka ndikosavuta kutulutsa pad;

Kupanikizika kochuluka komwe kumabwera chifukwa cha chitsulo chowotcherera pabedi komanso nthawi yayitali yowotcherera imatha kuwotcherera pedi.