Qhov tseeb ntawm kev sib dhos ntawm cov khoom sib dhos rau qhov chaw ruaj khov ntawm PCB yog lub hom phiaj tseem ceeb ntawm SMT thaj ua haujlwm, nyob rau hauv cov txheej txheem ntawm kev ua haujlwm thaj yuav inevitably tshwm sim qee cov txheej txheem teeb meem uas cuam tshuam rau qhov zoo ntawm thaj, xws li kev hloov ntawm cov khoom.
Feem ntau, yog hais tias nyob rau hauv cov txheej txheem ntawm patch processing, yog tias muaj kev hloov ntawm cov khoom, nws yog ib qho teeb meem uas xav tau kev saib xyuas, thiab nws cov tsos yuav txhais tau tias muaj ob peb lwm yam teeb meem hauv cov txheej txheem vuam. Yog li dab tsi yog vim li cas rau kev hloov pauv ntawm cov khoom hauv chip ua?
Feem ntau ua rau txawv pob hloov ua rau
(1) Lub reflow vuam rauv cua kub ceev yog loj heev (feem ntau tshwm sim ntawm BTU rauv, me me thiab siab Cheebtsam yog yooj yim rau hloov).
(2) Kev vibration ntawm cov lus qhia kev tsheb ciav hlau, thiab kev sib kis ntawm lub mounter (cov khoom hnyav dua)
(3) Lub ncoo tsim yog asymmetrical.
(4) Loj-loj nqa nqa (SOT143).
(5) Cheebtsam nrog tsawg tus pins thiab loj spans yog ib qho yooj yim rau rub tawm sab los ntawm lub solder nto nro. Lub siab ntev rau cov khoom xws li SIM phaib, pads lossis steel mesh Windows yuav tsum tsawg dua tus pin dav ntawm cov khoom ntxiv rau 0.3mm.
(6) Qhov ntev ntawm ob qhov kawg ntawm cov khoom sib txawv.
(7) Lub zog tsis sib xws ntawm cov khoom siv, xws li pob los tiv thaiv kev ntub dej, qhov chaw tso lub qhov lossis daim npav teeb tsa.
(8) Tom ntej no mus rau cov khoom uas nquag tso pa tawm, xws li tantalum capacitors.
(9) Feem ntau, cov tshuaj txhuam hniav uas muaj zog ua haujlwm tsis yooj yim rau kev hloov.
(10) Txhua yam uas tuaj yeem ua rau daim npav sawv cev yuav ua rau kev hloov pauv.
Hais txog qhov laj thawj tshwj xeeb
Vim yog reflow welding, cov khoom qhia txog lub xeev ntab. Yog tias xav tau qhov chaw kom raug, cov haujlwm hauv qab no yuav tsum tau ua:
(1) Lub tshuab luam ntawv luam ntawv yuav tsum yog qhov tseeb thiab cov hlau mesh qhov rais loj yuav tsum tsis txhob ntau tshaj 0.1mm wider tshaj tus pin tivthaiv.
(2) Tsim nyog tsim lub ncoo thiab kev teeb tsa txoj haujlwm kom cov khoom tuaj yeem hloov kho tau.
(1) Thaum tsim, qhov sib txawv ntawm cov khoom siv thiab nws yuav tsum tau nthuav dav kom tsim nyog.
Cov saum toj no yog qhov tseem ceeb uas ua rau kev hloov pauv ntawm cov khoom siv hauv thaj chaw ua haujlwm, thiab kuv vam tias yuav muab qee qhov kev siv rau koj ~
Post lub sij hawm: Nov-24-2023
