Thaum tham txog solder beading, peb thawj zaug yuav tsum raug txheeb xyuas qhov tsis xws luag SMT. Lub tin hlaws pom muaj nyob rau ntawm lub reflow welded phaj, thiab koj tuaj yeem qhia ntawm ib nrais muag tias nws yog ib lub pob loj tin embedded nyob rau hauv lub pas dej ua ke ntawm flux nyob ib sab ntawm cov khoom sib cais nrog qhov siab hauv av qis, xws li daim ntawv resistors thiab capacitors, nyias. Cov pob ntawv me me (TSOP), me me profile transistors (SOT), D-PAK transistors, thiab cov rooj sib txoos ua haujlwm. Vim tias lawv txoj haujlwm nyob rau hauv kev sib raug zoo nrog cov khoom no, tin hlaws feem ntau hu ua "satellites".
Tin hlaws tsis tsuas yog cuam tshuam rau cov tsos ntawm cov khoom, tab sis tseem ceeb tshaj, vim qhov ntom ntawm cov khoom ntawm cov ntawv luam tawm, muaj kev txaus ntshai ntawm luv luv Circuit Court ntawm kab thaum siv, yog li cuam tshuam rau cov khoom siv hluav taws xob zoo. Muaj ntau qhov laj thawj rau kev tsim cov tin hlaws, feem ntau tshwm sim los ntawm ib lossis ntau yam, yog li peb yuav tsum ua txoj haujlwm zoo ntawm kev tiv thaiv thiab kev txhim kho kom zoo dua qub. Cov kab lus hauv qab no yuav tham txog cov xwm txheej uas cuam tshuam rau kev tsim cov tin hlaws thiab cov kev tiv thaiv kom txo tau cov tin hlaws.
Vim li cas tin hlaws tshwm sim?
Yooj yim muab, tin hlaws feem ntau cuam tshuam nrog ntau dhau ntawm cov khoom siv tshuaj pleev ib ce, vim tias nws tsis muaj "lub cev" thiab yog nyem rau hauv cov khoom sib cais los tsim cov hlaws dai, thiab qhov nce hauv lawv cov tsos tuaj yeem raug ntaus nqi rau kev siv cov tshuaj yaug. - nyob rau hauv solder paste. Thaum cov chips tau mounted rau hauv lub rinseable solder paste, lub solder paste yog feem ntau yuav nyem nyob rau hauv lub tivthaiv. Thaum lub deposited solder paste ntau dhau lawm, nws yog ib qho yooj yim rau extrusion.
Lub ntsiab tseem ceeb cuam tshuam rau kev tsim cov tin hlaws yog:
(1) Template qhib thiab pad nraaj tsim
(2) Template ntxuav
(3) Repetition qhov tseeb ntawm lub tshuab
(4) Kub nkhaus ntawm reflow rauv
(5) Patch siab
(6) solder paste kom muaj nuj nqis sab nraum lub lauj kaub
(7) Kev tsaws qhov siab ntawm tin
(8) Cov roj tso tawm ntawm cov khoom tsis haum rau hauv kab phaj thiab cov txheej txheem solder
(9) Muaj feem cuam tshuam rau flux
Txoj hauv kev los tiv thaiv kev tsim cov tin hlaws:
(1) Xaiv qhov tsim nyog pad graphics thiab tsim loj. Hauv kev tsim cov ncoo tiag tiag, yuav tsum tau ua ke nrog PC, thiab tom qab ntawd raws li qhov tseeb ntawm pob khoom loj, vuam qhov kawg, los tsim cov ntaub qhwv loj.
(2) Ua tib zoo saib xyuas cov hlau mesh. Nws yog ib qho tsim nyog los kho qhov qhib qhov loj me raws li qhov tshwj xeeb kev teeb tsa ntawm PCBA pawg thawj coj saib kom tswj tau cov ntawv luam tawm ntawm cov tshuaj nplaum.
(3) Nws raug pom zoo tias PCB liab qab boards nrog BGA, QFN thiab cov ko taw ntom ntom ntawm lub rooj tsavxwm ua haujlwm nruj heev. Txhawm rau kom ntseeg tau tias cov av noo ntawm cov phaj solder raug tshem tawm kom ua kom muaj kev sib txuas ntau tshaj plaws.
(4) Txhim kho qhov zoo ntawm template tu. Yog tias kev ntxuav tsis huv. Residual solder paste nyob rau hauv qab ntawm lub template qhib yuav sib sau nyob ze ntawm lub template qhib thiab tsim ntau solder paste, ua rau tin hlaws dai
(5) Los xyuas kom meej qhov rov ua haujlwm ntawm cov khoom siv. Thaum cov tshuaj nplaum tau luam tawm, vim yog qhov offset ntawm lub template thiab lub ncoo, yog tias qhov offset loj dhau lawm, cov tshuaj nplaum yuav raug tsau rau sab nraum lub ncoo, thiab cov tin hlaws yuav yooj yim tshwm tom qab cua sov.
(6) Tswj lub siab mounting ntawm lub tshuab mounting. Txawm hais tias lub siab tswj hom yog txuas nrog, los yog cov khoom siv thickness tswj, qhov chaw yuav tsum tau kho kom tsis txhob tin hlaws dai.
(7) Optimize qhov kub thiab txias nkhaus. Tswj qhov kub ntawm reflow vuam, kom cov kuab tshuaj yuav volatilized ntawm lub platform zoo dua.
Tsis txhob saib "satellite" yog me me, ib qho tsis tuaj yeem rub, rub tag nrho lub cev. Nrog cov khoom siv hluav taws xob, dab ntxwg nyoog feem ntau nyob hauv cov ntsiab lus. Yog li ntawd, ntxiv rau kev saib xyuas ntawm cov neeg ua haujlwm tsim khoom, cov koom haum tseem ceeb yuav tsum koom tes nrog, thiab sib txuas lus nrog cov neeg ua haujlwm hauv lub sijhawm rau cov ntaub ntawv hloov pauv, hloov pauv thiab lwm yam teeb meem los tiv thaiv kev hloov pauv ntawm cov txheej txheem los ntawm cov khoom hloov pauv. Tus tsim lub luag haujlwm rau PCB Circuit Court tsim yuav tsum sib txuas lus nrog cov txheej txheem cov neeg ua haujlwm, xa mus rau cov teeb meem lossis cov lus pom zoo los ntawm cov txheej txheem cov neeg ua haujlwm thiab txhim kho lawv ntau li ntau tau.
Post lub sij hawm: Jan-09-2024
