Yuav ua li cas xaiv cov khoom PCB thiab cov khoom siv hluav taws xob zoo

Kev xaiv ntawm PCB cov ntaub ntawv thiab cov khoom siv hluav taws xob yog qhov paub zoo, vim tias cov neeg siv khoom yuav tsum xav txog ntau yam, xws li cov ntsuas kev ua tau zoo, kev ua haujlwm ntawm cov khoom, thiab cov khoom zoo thiab qib ntawm cov khoom.

1. Kev xaiv cov khoom siv PCB

Rau cov khoom siv hluav taws xob dav dav, siv FR4 epoxy iav fiber ntau substrate, rau qhov kub thiab txias los yog hloov pauv hauv Circuit Court board siv polyimide iav fiber ntau substrate, rau high-frequency circuits, koj yuav tsum siv PTFE iav fiber substrate; rau cov khoom siv hluav taws xob nrog cov cua kub dissipation yuav tsum tau siv hlau substrates.

Cov yam ntxwv uas yuav tsum tau xav txog thaum xaiv cov khoom siv PCB:

(1) Lub substrate nrog lub iav hloov pauv kub siab (Tg) yuav tsum raug xaiv kom tsim nyog, thiab Tg yuav tsum siab tshaj qhov ntsuas kub ntawm Circuit Court.

(2) Cov coefficient ntawm thermal expansion (CTE) yuav tsum tau qis. Vim qhov tsis sib xws ntawm thermal expansion coefficients hauv X, Y thiab cov lus qhia tuab, nws yooj yim ua rau PCB deformation, thiab nyob rau hauv cov xwm txheej hnyav, lub qhov metallized yuav tawg thiab cov khoom yuav puas.

(3) Kev kub siab ua haujlwm yuav tsum tau ua. Feem ntau, PCB yuav tsum muaj qhov kub ntawm 250 degree / 50S.

(4) Zoo flatness yuav tsum tau. PCB warpage xav tau ntawm SMT yog<0.0075mm>

(5) Raws li cov khoom siv hluav taws xob, cov khoom siv hluav taws xob ntau zaus yuav tsum xaiv cov khoom siv nrog cov dielectric siab tas li thiab tsis tshua muaj dielectric poob. Rwb thaiv tsev tsis kam, tiv taus voltage, thiab arc kuj yuav tsum tau raws li cov khoom yuav tsum tau.

2. Kev xaiv cov khoom siv hluav taws xob

Thaum xaiv cov khoom, ntxiv rau kom ua tau raws li qhov yuav tsum tau ua ntawm cov khoom siv hluav taws xob, nws yuav tsum ua kom tau raws li qhov yuav tsum tau ua ntawm cov khoom sib dhos rau cov khoom. Nws tseem yog ib qho tsim nyog los xaiv daim ntawv ntim ntawm cov khoom, qhov loj ntawm cov khoom, thiab daim ntawv ntim ntawm cov khoom raws li cov khoom siv ntawm cov kab ntau lawm thiab cov txheej txheem thev naus laus zis ntawm cov khoom. Piv txwv li, nws yog ib qho tsim nyog los xaiv cov khoom nyias nyias thiab me me thaum lub sij hawm sib dhos siab; Piv txwv li, thaum lub tshuab tso kawm tsis muaj daim kab xev dav dav, nws tsis tuaj yeem xaiv SMD cov khoom ntim nrog daim kab xev.