Cov PCB tau dhau los ua qhov tseem ceeb dua, thiab kev ntseeg tau ntawm kev sib dhos tau dhau los ua qhov tseem ceeb ntawm kev sib tw ntawm cov khoom siv hluav taws xob.
1. Taw qhia.
Nrog txoj kev loj hlob sai ntawm cov ntaub ntawv siv thev naus laus zis, tshwj xeeb tshaj yog cov ntsiab lus thiab cov xwm txheej hauv cov cuab yeej riam phom niaj hnub tau dhau los ua cov tseem ceeb uas txiav txim siab tag nrho ntawm cov riam phom thiab cov khoom siv, thiab cov khoom siv hluav taws xob zoo ncaj qha txiav txim siab qhov ua tau zoo ntawm riam phom thiab khoom siv hauv tshav rog. Yog li ntawd, nws yog qhov tshwj xeeb kom txhim kho kev sib dhos zoo ntawm cov khoom siv hluav taws xob, tshwj xeeb yog kev ntseeg tau ntawm PCB pawg thawj coj. Daim ntawv no piav qhia txog yuav ua li cas txhim kho kev ntseeg tau ntawm PCB pawg thawj coj los ua ke los ntawm tsib yam: kev xaiv tsim nyog thiab tsim qauv ntawm cov khoom, kev xaiv thiab kev tsim qauv ntawm cov seem, teeb thiab cov kev taw qhia kev tsim ntawm Cheebtsam, luam ntawv ntawm SMT ham muab tshuaj thiab kev tswj zoo ntawm reflow soldering. Cov.
2. Tsim nyog xaiv thiab tsim ntawm cov cheebtsam.
Qhov kev xaiv tsim nyog thiab tsim qauv ntawm cov khoom sib txuas yog qhov sib txuas qhov tseem ceeb hauv pawg thawj coj-pawg sib koom tes ntawm PCB. Raws li cov kev xav tau ntawm cov txheej txheem, cov khoom siv thiab kev tsim qauv tag nrho, daim ntim ntim thiab cov qauv ntawm SMC / SMD raug xaiv raws li kev ua hluav taws xob thiab kev ua haujlwm ntawm cov khoom txiav txim siab, uas ua lub luag haujlwm txiav txim siab nyob hauv Circuit Court tsim ntom ntuag, tsim khoom, kuaj tau thiab ntseeg tau. Tam sim no, muaj ntau yam kev qhia tshwj xeeb thiab cov qauv sib txawv ntawm SMT Cheebtsam, thiab tej zaum yuav muaj ntau yam ntim ntawv rau kev sib xyaw ua ke uas ua tiav tib txoj haujlwm; hauv kev tsim qauv ntawm Circuit Court PCB, kev xaiv tsim nyog yuav tsum tau ua raws li qhov tshwj xeeb ntawm cov cheebtsam muab los ntawm cov neeg muab khoom lag luam thiab lub peev xwm thiab qhov tseeb ntawm cov khoom siv ntau lawm.
3.Xim Txheeb thiab Kev Tsim ntawm PCB substrate.
Kev ua tiav ntawm cov txaij hluav taws xob yog qhov tseem ceeb ntawm PCB module, uas yuav cuam tshuam ntau qhov hluav taws xob kev ua haujlwm, kev siv tshuab thiab kev ntseeg tau ntawm cov khoom siv hluav taws xob, yog li nws yuav tsum tau ua tib zoo xaiv.
3.1 cov khoom siv substrate.
Nws feem ntau yuav tsum tau hais tias lub thermal expansion coefficient (CTE) yuav tsum me me li qhov ua tau thiab qhov sib xws yog qhov zoo, thiab cov substrate yuav tsum muaj qhov kub tsis kam ua ntawm 260C / 50s. Rau ib qho thiab ob qho vaj huam sib luag nrog qis dua qhov yuav tsum tau ua, FR-4 tooj liab-clad epoxy iav ntaub ntaub laminate tuaj yeem siv, uas tsim nyog rau ntsaws thiab muab cov khoom sib xyaw. Thaum txhim kho lub suab nkauj zoo nkauj IC nrog lub zog loj thiab qhov ceev, tooj liab clad polyimide iav daim ntaub laminate tuaj yeem siv, uas muaj ntau nyob rau hauv multilayer, ob tog kev rov qab ua haujlwm soldering txheej txheem lossis cov khoom siv hluav taws xob xav tau kev ntseeg siab.
3.2 txheej txheem kev cai yooj yim rau SMT luam tawm cov laug cam Circuit Court.
Qhov ntsuas kub ntawm qhov ntsuas ntawm SMT PCB nruj dua li tau hais txog ntawm PCB ib txwm muaj. Qhov siab tshaj plaws ntawm upwarping yog 0.5 hli thiab tias ntawm down down warping yog 1.2 hli. Hais txog txheej txheem ib sab, raws li tus nqi siab tshaj plaws ntawm SMB kev tsim khoom thiab cov neeg ua haujlwm teeb tsa, lub ntug ntev ntawm PCB feem ntau tsis pub dhau 5 hli. Txhawm rau kom ntseeg tau tias kis tau yooj yim ntawm PCB hauv qhov tsis siv neeg cov khoom siv hluav taws xob SMT, plaub lub kaum plaub ntawm PCB yuav tsum yog arc-puab (GG lt; lub taub ntawm 10.0mm). Los ntawm kev rov kuaj dua mus rau lub rooj sib txoos, lub tshuab nqus tsev ntawm PCB lub rooj tsavxwm raug tshem tawm thiab nthuav tawm hauv huab cua tau ntev, thiab lub ncoo ntawm PCB board yog oxidized nyob rau hauv huab cua, uas txo cov weldability ntawm PCB board thiab yooj yim ua rau vuam vuam. lub tshuab nqus tsev yuav tsum tswj ua ntej sib dhos.
