Hariho impamvu 3 zingenzi zogusukura PCBA

1. Kugaragara no gukora amashanyarazi asabwa

Ingaruka zimbitse zanduye kuri PCBA ni isura ya PCBA. Niba ishyizwe cyangwa ikoreshwa mubushyuhe bwo hejuru hamwe nubushuhe, hashobora kubaho kwinjiza amazi no kwera ibisigara. Bitewe no gukoresha cyane chip idafite amashanyarazi, micro-BGA, chip-urwego rwa chip (CSP) hamwe na 0201 ibice bigize ibice, intera iri hagati yibibaho ninama iragabanuka, ubunini bwikibaho buragenda bugabanuka, kandi ubwinshi bwinteko ni kwiyongera. Mubyukuri, niba igice cyihishe munsi yikigize cyangwa kidashobora gusukurwa na gato, isuku ryaho rishobora gutera ingaruka mbi bitewe no kurekura igice. Ibi birashobora kandi gutera gukura kwa dendrite, bishobora kuganisha kumuzingo mugufi. Isuku idahwitse yanduye ion bizatera ibibazo byinshi: kutarwanya hejuru yubutaka, kwangirika, hamwe n ibisigisigi byubutaka bizakora ikwirakwizwa rya dendritic (dendrite) hejuru yubuyobozi bwumuzunguruko, bikavamo umuzunguruko mugufi waho, nkuko bigaragara ku gishushanyo.

Inzitizi nyamukuru zibangamira ibikoresho bya elegitoroniki bya gisirikare ni amabati hamwe nicyuma. Ikibazo kirakomeje. Whiskers hamwe nicyuma intercompound amaherezo bizatera uruziga rugufi. Mubidukikije bitose hamwe namashanyarazi, niba hari ion nyinshi zanduye kubigize, birashobora gutera ibibazo. Kurugero, kubera imikurire ya tin whiskers ya electrolytike, kwangirika kwabayobora, cyangwa kugabanya ubukana bwokwirinda, insinga kurubaho zizunguruka zizunguruka, nkuko bigaragara ku gishushanyo

Isuku idakwiye ihumanya ritari ionic irashobora kandi gutera ibibazo byinshi. Birashobora kuvamo gufatana nabi kwa mask yubuyobozi, guhuza pin guhuza umuhuza, kutivanga kwumubiri, hamwe no kudahuza neza kwifata ihuza ibice byimuka. Muri icyo gihe, ibyanduye bitari ionic birashobora kandi gukingira ionic byanduye, kandi birashobora gukingira no gutwara ibindi bisigazwa nibindi bintu byangiza. Ibi nibibazo bidashobora kwirengagizwa.

2, Three anti-irangi ikenewe

Kugira ngo igifuniko cyizewe, isuku yo hejuru ya PCBA igomba kuba yujuje ibisabwa na IPC-A-610E-2010 urwego rwa 3. Ibisigarira bisigaye bidahanaguwe mbere yo gutwikirwa hejuru birashobora gutuma urwego rukingira rusenyuka, cyangwa urwego rukingira; Igisigisigi cya activate gishobora gutera amashanyarazi yimuka munsi yigitambaro, bikaviramo kunanirwa gukingirwa. Ubushakashatsi bwerekanye ko igipimo cyo guhuza ibicuruzwa gishobora kwiyongeraho 50% mugusukura.

3, No isuku nayo igomba gusukurwa

Ukurikije ibipimo biriho ubu, ijambo "nta-rifite isuku" risobanura ko ibisigazwa biri ku kibaho bifite umutekano mu miti, nta ngaruka bizagira ku kibaho, kandi bishobora kuguma ku kibaho. Uburyo bwihariye bwo kwipimisha nko gutahura ruswa, kurwanya insulasiyo yo hejuru (SIR), electromigration, nibindi bikoreshwa cyane cyane kugirango hamenyekane ibirimo halogene / halide bityo umutekano wibice bidafite isuku nyuma yo guterana. Nubwo, nubwo hatagira isuku yuzuye ifite ibintu bike bikoreshwa, hazakomeza kubaho ibisigisigi byinshi cyangwa bike. Kubicuruzwa bifite ibyangombwa bisabwa byizewe, nta bisigara cyangwa ibindi bihumanya byemewe kurubaho. Kubisabwa bya gisirikare, ndetse nibikoresho bya elegitoroniki bidafite isuku birakenewe.