Uruhare rwo kugurisha ibicuruzwa muri tekinoroji yo gutunganya SMT

Kugurisha kugurisha nabyo ni inzira yo kugurisha.Ihame ryayo ni ugucapa cyangwa gutera inshinge zikwiye zo kugurisha (Solder paste) kuri padi ya PCB hanyuma ugashyiraho ibice bikoreshwa mu gutunganya chip ya SMT, hanyuma ugakoresha ubushyuhe bwo mu kirere bushyushye bwo gushyushya ifuru yerekana kugirango ushushe amabati Paste irashonga hanyuma ikorwa, hanyuma amaherezo umugurisha wizewe agizwe no gukonjesha, kandi ibice bihujwe na padi ya PCB, ikina uruhare rwo guhuza imashini no guhuza amashanyarazi.Kugurisha kugurisha inzira biragoye kandi birimo ubumenyi butandukanye.Ni iy'ikoranabuhanga rishya rinyuranye.Muri rusange, kugurisha ibicuruzwa bigabanijwemo ibyiciro bine: gushyushya, ubushyuhe burigihe, kugaruka, no gukonja.

1. Agace gashyuha

Agace gashyushya: Nicyiciro cyambere cyo gushyushya ibicuruzwa.Intego yacyo ni ugushyushya ibicuruzwa byihuse mubushyuhe bwicyumba no gukora ibicuruzwa bya paste flux.Ni ukwirinda kandi ubushyuhe bwibintu biterwa no gushyuha byihuse cyane mugihe gikurikiraho cyo kwibiza.Uburyo bwo gushyushya bukenewe kwangirika.Kubwibyo, igipimo cyo gushyushya ni ingenzi cyane kubicuruzwa, kandi bigomba kugenzurwa mugihe gikwiye.Niba byihuse cyane, ihungabana ryumuriro rizabaho, kandi ikibaho cya PCB nibigize ibice bizaterwa nubushyuhe bwumuriro, byangiza.Muri icyo gihe, ibishishwa muri paste yo kugurisha bizashira vuba kubera ubushyuhe bwihuse.Niba itinda cyane, kugurisha paste solvent ntishobora guhinduka neza, bizagira ingaruka kubicuruzwa.

2. Ubushuhe buhoraho

Agace k'ubushyuhe gahoraho: intego yacyo ni uguhindura ubushyuhe bwa buri kintu kuri PCB no kugera ku bwumvikane bushoboka bwose kugirango hagabanuke itandukaniro ryubushyuhe hagati yibigize.Kuri iki cyiciro, igihe cyo gushyushya buri kintu ni kirekire.Impamvu nuko ibice bito bizagera kuri equilibrium mbere kubera ubushyuhe buke, kandi ibice binini bizakenera umwanya uhagije wo gufata ibice bito bitewe nubushyuhe bwinshi.Kandi urebe neza ko flux muri paste yagurishijwe ihindagurika rwose.Kuri iki cyiciro, munsi yibikorwa bya flux, okiside kuri padi, imipira yo kugurisha hamwe na pin yibigize bizakurwaho.Muri icyo gihe, flux nayo izakuraho amavuta hejuru yibice na padi, byongere aho bigurisha, kandi birinde ibice kongera okiside.Nyuma yiki cyiciro kirangiye, buri kintu kigomba kubikwa ku bushyuhe bumwe cyangwa busa, bitabaye ibyo hashobora kubaho kugurisha nabi bitewe nubushyuhe bukabije.

Ubushyuhe nigihe cyubushyuhe burigihe biterwa nuburemere bwibishushanyo bya PCB, itandukaniro ryubwoko bwibigize numubare wibigize, mubisanzwe hagati ya 120-170 ° C, niba PCB igoye cyane, ubushyuhe bwa zone yubushyuhe buhoraho bigomba kugenwa hamwe no koroshya ubushyuhe bwa rosin nkibisobanuro, ikigamijwe ni ukugabanya igihe cyo kugurisha muri zone yinyuma-yerekana inyuma, ubuso bwubushyuhe buhoraho bwikigo cyacu bwatoranijwe kuri dogere 160.

3. Kugaragaza akarere

Intego ya zone igarukira ni ugukora paste yugurisha igera kumashanyarazi hanyuma ugahanagura padi hejuru yibice bigomba kugurishwa.

Iyo ikibaho cya PCB cyinjiye muri zone yerekana, ubushyuhe buzamuka vuba kugirango paste igurisha igere kumera.Ingingo yo gushonga ya paste yo kugurisha icyuma Sn: 63 / Pb: 37 ni 183 ° C, hamwe na paste itagurishijwe idafite ibicuruzwa Sn: 96.5 / Ag: 3 / Cu: Ingingo yo gushonga ya 0.5 ni 217 ° C.Muri kano gace, ubushyuhe butangwa nubushyuhe ni bwinshi, kandi ubushyuhe bwitanura buzashyirwa hejuru, kuburyo ubushyuhe bwa paste yagurishijwe buzamuka mubushyuhe bwihuse.

Ubushyuhe bwo hejuru bwumurongo wo kugurisha bugarukira mubisanzwe bigenwa nokugonga gushonga kugurisha, ikibaho cya PCB, hamwe nubushyuhe bwihanganira ubushyuhe bwibigize ubwabyo.Ubushyuhe bwo hejuru bwibicuruzwa ahantu hagarukira buratandukana ukurikije ubwoko bwabacuruzi bakoresheje.Muri rusange, nta bushyuhe bwo hejuru bwo hejuru bwa paste yagurishijwe isukari muri rusange ni 230-250 ° C, naho irya paste yagurishijwe ni 210-230 ° C.Niba ubushyuhe bwo hejuru buri hasi cyane, bizatera byoroshye gusudira gukonje hamwe no guhanagura bidahagije kubagurisha;niba ari hejuru cyane, epoxy resin ubwoko bwa substrate izabikora Kandi igice cya plastiki gikunda gukonja, PCB ifuro no gusibanganya, kandi bizanatuma habaho kwibumbira mubyuma bya eutectic bikabije, bigatuma ingingo zigurisha zicika intege, bigabanya imbaraga zo gusudira, no kugira ingaruka kumiterere yibicuruzwa.

Twakagombye gushimangira ko flux muri paste yuwagurishije ahantu hagarukira bifasha mugutezimbere amazi ya paste yagurishijwe hamwe nuwagurishije amaherezo yibigize muri iki gihe, kandi bikagabanya ubukana bwubuso bwa paste yagurishijwe.Ariko, kubera umwuka wa ogisijeni usigaye hamwe nicyuma cya oxyde yo mu itanura ryerekana, Iterambere rya flux rikora nkikumira.

Mubisanzwe ubushyuhe bwiza bwitanura bugomba guhura nubushyuhe bwo hejuru bwa buri ngingo kuri PCB kugirango bihamye nkuko bishoboka, kandi itandukaniro ntirishobora kurenga dogere 10.Gusa murubu buryo turashobora kwemeza ko ibikorwa byose byo kugurisha byarangiye neza mugihe ibicuruzwa byinjiye muri zone ikonje.

4. Agace gakonje

Intego ya zone ikonjesha ni ugukonjesha byihuse uduce twagurishijwe twa paste paste, hanyuma ugahita ukora uduce twinshi two kugurisha hamwe na arc gahoro kandi byuzuye amabati.Kubwibyo, inganda nyinshi zizagenzura akarere gakonje, kuko zifasha kwibumbira hamwe.Mubisanzwe, umuvuduko ukonje cyane bizatuma paste yagurishijwe yashonze bitinze gukonjesha no gukonjesha, bikavamo umurizo, gukarisha ndetse no gutobora ku ngingo zagurishijwe.Igipimo gito cyo gukonjesha kizatuma ubuso bwibanze bwubuso bwa PCB Ibikoresho bivangwa muri paste yuwagurishije, bigatuma ingingo zigurisha zidakomera, kugurisha ubusa hamwe no kugurisha umwijima.Ikirenzeho, ibinyamakuru byose byicyuma kumpera yibicuruzwa bizashonga mubice bigurishwa, bigatuma impera zigurisha zirwanya ibishishwa cyangwa kugurisha nabi.Ihindura ubwiza bwibicuruzwa, bityo igipimo cyiza cyo gukonjesha ningirakamaro cyane kubagurisha hamwe.Muri rusange, abagurisha paste bagurisha bazasaba abagurisha igipimo cyo gukonjesha cya ≥3 ° C / S.

Inganda za Chengyuan nisosiyete izobereye mugutanga ibikoresho byumurongo wa SMT na PCBA.Iraguha igisubizo kibereye kuri wewe.Ifite imyaka myinshi yumusaruro nuburambe bwubushakashatsi.Abatekinisiye babigize umwuga batanga ubuyobozi bwo kwishyiriraho na nyuma yo kugurisha inzu ku nzu, kugirango udafite impungenge.