Thaum lub tshuab nqus tsev reflow soldering ho txhim kho kev sib koom tes zoo, nws cov txheej txheem tshwj xeeb kuj qhia txog cov kev pheej hmoo uas yuav tsum tau ua tib zoo soj ntsuam thiab kev tswj xyuas thaum thov.
1.Qhov kev pheej hmoo ntawm cov cuab yeej pob tsis ua haujlwm.
Rau cov uas tsis yog-hermetic Cheebtsam nrog cov kab noj hniav sab hauv (xws li qee QFNs), nyob rau hauv ib qho chaw siab - qhov chaw nqus tsev vacuum, huab cua hauv cov kab noj hniav nthuav dav vim yog cua sov, tsim kom muaj qhov sib txawv loj nrog lub tshuab nqus tsev sab nraud. Nyob rau tib lub sijhawm, thaum qhov kub ntawm qhov ntsuas kub siab tshaj cov khoom siv iav hloov pauv kub (Tg), nws lub zog txhua yam txo qis. Raws li kev sib xyaw ua ke ntawm kev ntxhov siab thermal thiab qhov sib txawv ntawm sab hauv / sab nraud, cov cuab yeej pob muaj kev pheej hmoo loj ntawm kev tawg.
2.Qhov teeb meem ntawm ntau tshaj reflow lub sij hawm txwv.
Lub tshuab nqus tsev reflow soldering feem ntau cuam tshuam nrog lub sijhawm ntev dua ntawm cov kua dej (feem ntau Ntau dua lossis sib npaug li 80s), uas tuaj yeem dhau qhov kev txwv siab tshaj ntawm cov lus qhia tshwj xeeb rau qee qhov cua sov - sijhawm - cov khoom rhiab heev, ua rau overheating thiab puas.
3.Txoj kev hloov pauv hauv kev sib koom ua ke morphology nthuav tawm cov kev sib tw tshiab.
1) Rau BTC- hom khoom siv, lub tshuab nqus tsev ib puag ncig txo qhov sawv ntsug- tawm qhov siab ntawm cov pob qij txha, ua rau cov khoom siv ntau dua rau kev sib kis mus rau sab nraud, ua rau muaj kev pheej hmoo ntawm kev sib txuas. Yog li ntawd, txo qhov luaj li cas ntawm stencil qhib yuav tsum xav txog.
2) Rau kev nplua -pitch BGAs (xws li, suab tsawg dua lossis sib npaug li 0.4mm), kev ua haujlwm nqus tau yooj yim ua rau kev sib txuas, thiab nws feem ntau tsis pom zoo siv. Yog tias nws yuav tsum tau siv, qhov qhib stencil yuav tsum tau txo qis thaum ua tau raws li qhov xav tau ntawm cheeb tsam.
3) Rau qhov loj - thaj chaw hauv av, txo cov qhov qhib yuav ua rau txo qis ntawm cov khoom siv tshuaj txhuam hniav; qhov qhib stencil yuav tsum tau nthuav dav kom tsim nyog los xyuas kom meej qhov chaw soldering.
4.Cov khoom siv nws tus kheej muaj kev pheej hmoo tshwj xeeb.
1) Nws peb -section saw conveyor system muaj qhov khoob hauv seem nqus. Rau cov PCBs me me (piv txwv li,<100mm), there is a risk of board jamming and vibration during board passage, which may cause component displacement or drop. Fixtures must be used for support.
2) Cov khoom txav mus rau hauv qhov chaw nqus tsev yog qhov kub thiab txias rau lub sijhawm ntev, yuav tsum muaj kev saib xyuas zoo heev thiab kev tu cov saw, sensors, thiab sealing rings; txwv tsis pub, malfunctions los yog nqus theem poob yuav yooj yim tshwm sim.
5.Txoj kev ua haujlwm kom raug yog qhov tseem ceeb heev.
Lub caij nplooj ntoos hlav insertion yuav tsum nruj me ntsis tswj. Yog hais tias tus neeg teb xov tooj manually thawb lub rooj tsavxwm tsis raug, uas ua rau lub rooj tsav xwm tsis txaus, "board collision" lossis board jamming xwm txheej tuaj yeem tshwm sim tau yooj yim nyob rau hauv lub tshuab nqus tsev, ua rau muaj kev cuam tshuam ntau lawm thiab cov khoom seem.
