Dab tsi yog Qhov Ua rau thiab kev daws teeb meem ntawm PCB Distortion?

PCB distortion yog ib qho teeb meem tshwm sim hauv PCBA batch ntau lawm, uas yuav ua rau muaj kev cuam tshuam loj rau kev sib dhos thiab kev sim.Yuav ua li cas zam qhov teeb meem no, thov saib hauv qab no.

Qhov ua rau ntawm PCB distortion yog raws li nram no:

1. Kev xaiv tsis raug ntawm PCB cov ntaub ntawv raw, xws li qis T ntawm PCB, tshwj xeeb tshaj yog cov ntawv-raws li PCB, nws cov txheej txheem kub siab dhau lawm, PCB yuav khoov.

2. Kev tsim PCB tsis raug, kev faib tsis sib npaug ntawm cov khoom yuav ua rau muaj kev ntxhov siab ntau dhau ntawm PCB, thiab cov khoom sib txuas thiab cov qhov (sockets) nrog cov duab loj dua yuav cuam tshuam rau PCB expansion thiab contraction, uas ua rau muaj kev cuam tshuam mus tas li.

3. PCB tsim teeb meem, xws li ob-sided PCB, yog tias daim ntawv tooj liab ntawm ib sab loj dhau, xws li hauv av xaim, thiab daim ntawv tooj liab ntawm sab nraud me dhau, nws tseem yuav ua rau tsis sib xws thiab deformation ntawm ob sab.

4. Kev siv tsis raug ntawm kev sib tw lossis kev sib tw sib tw yog qhov tsawg dhau, xws liyoj soldering tshuabntiv tes claw clamping nruj heev, PCB yuav nthuav dav thiab deformation vim vuam kub.

5. Kub kub hauvreflow qhov cubwelding kuj yuav ua rau distortion ntawm PCB.

Raws li cov laj thawj saum toj no, cov kev daws teeb meem yog raws li hauv qab no:

1. Yog tias tus nqi thiab qhov chaw tso cai, xaiv PCB nrog Tg siab lossis nce PCB thickness kom tau qhov zoo tshaj plaws nam piv.

2. Tsim PCB tsim nyog, thaj tsam ntawm ob sab steel ntawv yuav tsum sib npaug, thiab txheej tooj liab yuav tsum tau them rau qhov tsis muaj qhov hluav taws xob, thiab tshwm sim hauv daim phiaj sib zog kom muaj zog ntawm PCB.

3. PCB yog ua ntej ci ua ntejSMT tshuabntawm 125 ℃ / 4h.

4. Kho lub fixture los yog clamping nrug los xyuas kom meej qhov chaw rau PCB cua sov expansion.

5. Cov txheej txheem vuam kub kom tsawg li tsawg tau, qhov tsis sib haum me me tau tshwm sim, tuaj yeem muab tso rau hauv qhov chaw teeb tsa, qhov kub thiab txias rov pib dua, tso tawm qhov kev ntxhov siab, feem ntau txaus siab yuav ua tiav.