Lub deformation ntawm lub PCB pawg thawj coj saib, tseem hu ua qib ntawm warpage, muaj kev cuam tshuam zoo rau kev siv vuam thiab siv. Tshwj xeeb tshaj yog rau cov khoom sib txuas lus, ib lub rooj tsavxwm yog ntsia rau hauv lub thawv ntsaws. Muaj ib qho kev sib nrug ntawm cov laug cam. Nrog rau qhov nqaim ntawm lub vaj huam sib luag, qhov sib txawv ntawm cov khoom ntawm cov kab txuas txuas uas nyob ib sab ua me thiab me dua. Yog tias lub PCB yog khoov, nws yuav cuam tshuam rau kev ntsaws thiab tshem tawm, nws yuav kov cov khoom. Ntawm qhov tod tes, qhov deformation ntawm PCB muaj kev cuam tshuam zoo rau kev ntseeg siab ntawm BGA Cheebtsam. Yog li ntawd, nws yog ib qho tseem ceeb heev los tswj lub deformation ntawm PCB thaum lub sij hawm thiab tom qab cov txheej txheem soldering.

(1) Qhov degree ntawm deformation ntawm PCB yog ncaj qha ntsig txog nws qhov loj thiab tuab. Feem ntau, qhov nam piv yog tsawg dua los yog sib npaug rau 2, thiab qhov dav rau thickness yog tsawg dua los yog sib npaug rau 150.

(2) Multilayer rigid PCB yog tsim los ntawm tooj liab ntawv ci, prepreg thiab core board. Txhawm rau txo qhov deformation tom qab nias, laminated qauv ntawm PCB yuav tsum ua kom tau raws li qhov xav tau ntawm cov qauv tsim, uas yog, lub thickness ntawm cov ntawv ci tooj liab, hom thiab thickness ntawm qhov nruab nrab, kev faib khoom ntawm cov duab (circuit txheej, dav hlau. txheej), thiab lub siab txheeb ze rau lub thickness ntawm PCB. Cov kab nruab nrab ntawm cov kev taw qhia yog symmetrical.

(3) Rau qhov loj-loj PCBs, anti-deformation stiffeners los yog hauv ob sab phlu boards (tseem hu ua fire-proof boards) yuav tsum tau tsim. Qhov no yog ib txoj kev ntawm mechanical reinforcement.

(4) Rau qee qhov kev teeb tsa cov qauv uas yuav ua rau PCB board deformation, xws li CPU card sockets, lub rooj tsav tsheb nraub qaum uas tiv thaiv PCB deformation yuav tsum tau tsim.