PCB distortion yog ib qho teeb meem tshwm sim hauv PCBA ntau lawm, uas yuav muaj kev cuam tshuam loj heev rau kev sib dhos thiab kev sim, ua rau hluav taws xob ua haujlwm tsis ruaj khov, Circuit Court luv luv / qhib Circuit Court tsis ua haujlwm.
Qhov ua rau ntawm PCB deformation yog raws li nram no:
1. Kub ntawm PCBA board hla lub qhov cub
Cov kab hluav taws xob sib txawv muaj qhov kub siab tshaj plaws.Thaum lubreflow qhov cubqhov kub thiab txias yog siab dhau, siab tshaj tus nqi siab tshaj plaws ntawm lub rooj tsavxwm Circuit Court, nws yuav ua rau lub rooj tsavxwm muag muag thiab ua rau deformation.
2. Ua rau ntawm PCB board
Qhov nrov ntawm cov tshuab tsis muaj hlau lead, qhov kub ntawm lub cub tawg yog siab dua li cov hlau lead, thiab cov kev xav tau ntawm cov phaj tshuab yog siab dua thiab siab dua.Qhov qis dua tus nqi TG, qhov yooj yim dua lub rooj tsav xwm hauv Circuit Court yuav deform thaum lub cub tawg.Qhov siab dua tus nqi TG, lub rooj tsavxwm yuav kim dua.
3. PCBA pawg thawj coj loj thiab tus naj npawb ntawm cov boards
Thaum lub Circuit Court dhau lawmreflow vuam tshuab, nws yog feem ntau muab tso rau hauv cov saw rau kev sib kis, thiab cov chains ntawm ob sab yog cov ntsiab lus txhawb nqa.Qhov luaj li cas ntawm lub rooj tsavxwm Circuit Court yog loj dhau los yog tus naj npawb ntawm cov laug cam loj dhau, ua rau muaj kev nyuaj siab ntawm lub rooj tsavxwm Circuit Court mus rau qhov nruab nrab, uas ua rau deformation.
4. Thickness ntawm PCBA board
Nrog rau txoj kev loj hlob ntawm cov khoom siv hluav taws xob nyob rau hauv cov kev taw qhia ntawm me me thiab nyias, lub thickness ntawm lub rooj tsavxwm Circuit Court yog ua thinner.Lub thinner lub rooj tsav xwm Circuit Court yog, nws yog ib qho yooj yim ua rau lub deformation ntawm lub rooj tsavxwm nyob rau hauv lub siab kub thaum reflow vuam.
5. Qhov tob ntawm v-txiav
V-txiav yuav rhuav tshem cov txheej txheem ntawm lub rooj tsavxwm.V-txiav yuav txiav grooves ntawm thawj daim ntawv loj.Yog tias V-txiav kab tob dhau lawm, qhov deformation ntawm PCBA pawg thawj coj saib yuav tshwm sim.
Cov ntsiab lus sib txuas ntawm cov khaubncaws sab nraud povtseg ntawm PCBA board
Niaj hnub no lub rooj tsavxwm Circuit Court yog ntau txheej pawg thawj coj saib, muaj ntau cov ntsiab lus sib txuas ntawm qhov sib txuas, cov ntsiab lus sib txuas no tau muab faib ua los ntawm lub qhov, qhov muag tsis pom, qhov taw tes faus, cov ntsiab lus txuas no yuav txwv qhov cuam tshuam ntawm thermal expansion thiab contraction ntawm lub rooj tsavxwm. , ua rau deformation ntawm lub rooj tsavxwm.
Kev daws:
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 ntej SMT ntawm 125 ℃ / 4h.
4. Kho lub fixture los yog clamping nrug los xyuas kom meej qhov chaw rau PCB cua sov expansion.
5. vuam txheej txheem kub kom tsawg li sai tau;Kev hloov pauv 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.
Post lub sij hawm: Oct-19-2021