Qhov teeb meem shrinkage ntawm cov ntawv luam tawm Circuit Board
Tso lus
Thaum qhov kub ntawm qhov sib txawv ntawm qhov chaw nruab nrab thiab thaj tsam ntug ntawm lub rooj tsavxwm sib txawv, lub rooj tsavxwm yuav muaj qhov sib txawv ntawm qhov nthuav dav thiab kev cog lus. Qhov teeb meem no yuav ua rau muaj kev puas tsuaj rau cov pob qij txha thiab cov khoom siv hauv lub rooj tsav xwm luam tawm, yog li cuam tshuam rau kev ua haujlwm ntawm tag nrho pcb.
Qhov teeb meem shrinkage yog hais txog qhov hloov pauv loj los ntawm kev hloov pauv ntawm cov dej noo los yog qhov tsis sib xws ntawm cov cua sov thaum lub sij hawm tsim cov txheej txheem ntawm cov ntawv luam tawm. Nyob rau hauv ib txwm muaj xwm txheej, lub rooj tsav xwm luam tawm yuav poob qis tom qab ua tiav, uas yog tshwm sim los ntawm evaporation ntawm nws cov dej sab hauv. Txawm li cas los xij, thaum lub rooj tsavxwm ntsib qhov chaw ntub dej lossis cua sov, cov dej yuav rov nkag mus rau sab hauv ntawm lub rooj tsavxwm, ua rau nws qhov loj tuaj thiab ntsws.
Qhov teeb meem ntawm compression expansion thiab shrinkage ntawm cov ntawv luam tawm Circuit Court boards feem ntau muaj feem xyuam rau cov coefficient ntawm thermal expansion ntawm cov ntaub ntawv. Lub coefficient ntawm thermal expansion ntawm cov ntaub ntawv sib txawv yog txawv, thiab thaum lub sij hawm luam ntawv Circuit Court board yog rhuab, sib txawv qhov chaw yuav muaj ntau degrees ntawm expansion thiab contraction. Raws li ib txwm muaj, lub rooj tsav xwm luam tawm yog tsim los ntawm iav fiber ntau thiab epoxy resin, thiab nws cov coefficient ntawm thermal expansion yog li ntawm 16-18 ppm / degree, thaum lub coefficient ntawm thermal expansion ntawm tooj liab ntawv ci yog li 17 ppm / degree.
Daim duab: Brown oxide
Kev nthuav dav thiab kev cog lus ntawm cov rooj sib tham hauv Circuit Court yuav muaj kev cuam tshuam rau cov khoom hauv qab no
1. Ua rau txo qis hauv hluav taws xob ua haujlwm ntawm lub rooj tsav xwm luam tawm
Yog tias qhov teeb meem ntawm kev nthuav dav thiab kev cog lus ntawm cov ntawv luam tawm Circuit Board tsis daws tau raws sijhawm, nws tuaj yeem ua rau kev sib cais ntawm cov ntaub ntawv, txheej txheej rwb thaiv tsev rupture, thiab lwm yam, ua rau txo qis hauv hluav taws xob ua haujlwm. Qhov no tsis tsuas yog txo qhov kev ua tau zoo ntawm tag nrho cov Circuit Court, tab sis kuj ua rau kom muaj kev nyab xeeb ntawm cov khoom siv hluav taws xob thaum ua haujlwm.
2. Kev cuam tshuam rau kev ntseeg ntawm cov khoom
Qhov teeb meem ntawm cov ntawv luam tawm Circuit Board nthuav dav thiab kev cog lus tuaj yeem ua rau muaj kev ntxhov siab sab hauv ntawm cov khoom siv hluav taws xob, ua rau muaj teeb meem xws li cov cuab yeej looseness thiab solder sib koom ua ke, thiab txo cov khoom lag luam.
Yuav kom daws tau qhov teeb meem ntawm compression expansion thiab contraction ntawm lub rooj tsavxwm Circuit Court, cov kev ntsuas hauv qab no feem ntau yog siv:
1. Xaiv cov khoom tsim nyog. Cov kws tsim khoom tuaj yeem xaiv cov khoom siv nrog cov coefficient me me ntawm thermal expansion los tsim cov khoom siv hluav taws xob, xws li polyimide (PI) thiab polytetrafluoroethylene (PTFE). Cov ntaub ntawv no muaj qhov kub thiab txias ua haujlwm zoo thiab cov khoom siv kho tshuab, uas tuaj yeem txo qhov nthuav dav thiab shrinkage ntawm lub rooj tsavxwm Circuit Court.
2. Kho qhov sib koom ua ke layout. Kev kho qhov sib koom ua ke raug kho tuaj yeem txo qhov teeb meem kev ntxhov siab los ntawm PCB nthuav dav thiab kev cog lus. Qhov sib txuas ntawm qhov sib txuas yuav tsum yog sib xws li qhov ua tau thiab kom deb li deb ntawm ntug ntawm lub rooj tsavxwm li sai tau. Qhov no tuaj yeem txo qhov kev ntxhov siab ntawm cov pob qij txha pcb thiab txo qhov kev pheej hmoo ntawm cov pob qij txha tawg.
3. Tswj qhov kub thiab txias. Hauv kev tsim cov txheej txheem ntawm pcb, qhov kub thiab txias thiab lub sijhawm nias yuav tsum tau tswj thiab ua kom zoo raws li cov yam ntxwv ntawm cov khoom thiab cov txheej txheem ib puag ncig. Cov txheej txheem nias tsim nyog tuaj yeem txo qhov kev nthuav dav thiab shrinkage ntawm pcb thiab xyuas kom meej qhov hluav taws xob ua tau zoo ntawm lub rooj tsav xwm luam tawm.
Printed circuit board compaction thiab shrinkage yog ib qho teeb meem tab sis loj heev uas tuaj yeem cuam tshuam rau kev ua haujlwm thiab kev pabcuam lub neej ntawm lub rooj tsavxwm luam tawm. Cov kev ntsuas saum toj no tuaj yeem txo qhov tshwm sim ntawm kev nthuav dav thiab kev cog lus teeb meem thiab txhim kho kev ntseeg tau thiab ruaj khov ntawm cov ntawv luam tawm Circuit Board.
