Umwirondoro-wubusa Kugaragaza Umwirondoro: Ubwoko bwokunywa nubwoko bwo gusinzira

Kugurisha ibicuruzwa ni uburyo bwo kugurisha paste yo kugurisha no guhinduka kuri leta yashongeshejwe kugirango uhuze ibice bya pin hamwe na padi ya PCB hamwe burundu.

Hano hari intambwe enye / zone kuriyi nzira - gushyushya, gushiramo, kugarura no gukonjesha.

Kubwoko bwa trapezoidal ubwoko bwumwirondoro shingiro kuburongozi bwubusa kugurisha Bittele ikoresha muburyo bwo guteranya SMT:

1. Agace gashyuha: Ubushuhe busanzwe bivuga kongera ubushyuhe kuva ku bushyuhe busanzwe kugera kuri 150 ° C no kuva kuri 150 ° C kugeza kuri 180 C. Ubushyuhe bwo hejuru kuva kuri bisanzwe kugera kuri 150 ° C ntiburi munsi ya 5 ° C / sek (kuri 1.5 ° C ~ 3 ° C / amasegonda), kandi igihe kiri hagati ya 150 ° C kugeza 180 ° C ni hafi 60 ~ 220 sec.Inyungu yo gushyuha gahoro ni ukureka ibishishwa n'amazi mumazi ya paste asohoka mugihe.Irekera kandi ibice binini gushyuha hamwe nibindi bice bito.
2. Agace kogeramo: Igihe cyo gushyushya kuva kuri 150 ° C kugeza kumashanyarazi yashizwemo kizwi kandi nkigihe cyo gushiramo, bivuze ko flux igenda ikora kandi ikanakuraho umusemburo wa okiside hejuru yicyuma bityo ikaba yiteguye gukora umugurisha mwiza hagati y'ibice pin hamwe na PCB.
3. Agace kagaruka: Agace kagaruka, nanone bita "igihe kiri hejuru ya fluidus" (TAL), nigice cyibikorwa aho ubushyuhe bwo hejuru bugeze.Ubushuhe busanzwe buri hejuru ya 20-40 ° C hejuru ya fluid.
4. Agace gakonje: Muri zone ikonje, ubushyuhe buragenda bugabanuka buhoro buhoro kandi bigakora ingingo zikomeye zigurisha.Umubare ntarengwa wemerewe gukonjesha ahantu hagomba gusuzumwa kugirango wirinde inenge iyo ari yo yose.Birakenewe igipimo cyo gukonja cya 4 ° C / s.

Hariho imyirondoro ibiri itandukanye igira uruhare mubikorwa byo kugarura - ubwoko bwokunywa nubwoko bwo gusinzira.

Ubwoko bwa Soaking burasa na trapezoidal mugihe ubwoko bwo gusinzira bufite ishusho ya delta.Niba ikibaho cyoroshye kandi ntakintu kirimo ibintu bigoye nka BGAs cyangwa ibice binini kurubaho, umwirondoro wubwoko bwihuta bizaba byiza guhitamo.