1. Vim li cas rau hauv Circuit Court board yuav tsum tau heev tiaj
Nyob rau hauv lub automatic zoo kab, yog hais tias tus printing Circuit Court board yog tsis ncaj nraim, nws yuav ua rau qhov chaw yuav tsis muaj tseeb, lub Cheebtsam yuav tsis muab tso rau hauv lub qhov thiab nto ntawm lub phaj, thiab txawm lub automatic plug loader.When lub PCB board uas tuaj txoos ua ke tivthaiv yog welded tom qab soldering, thiab tus taw ntawm lub caij yog nyuaj yuav tsum tau txiav neatly.The PCB board kuj tsis tau ntsia tau rau hauv lub tshuab lub thawv los yog lub nplos nyob rau hauv lub tshuab, li ntawd, lub PCB los ua ke Hoobkas rooj sib tham phaj warped yog tseem heev troublesome.At tam sim no, lub luam ntawv circuit Court board tau nkag mus hauv lub era ntawm nto installation thiab nti installation, thiab cov ntawv luam circuit Court board los ua ke cog yuav tsum muaj ntau thiab ntau nruj nrog cov yuav tsum tau cov phaj warped.
2. Standard thiab kuaj txoj kev rau warp
Raws li lub tebchaws United States IPC-6012 (1996 tsab) << txhav luam Circuit Court board qhia kom paub thiab ua tau zoo specifications >>, lub pub nyiaj pab ntau tshaj kev nkhaus thiab distortion ntawm qhov chaw mounting phaj yog 0.75%, thiab tag nrho cov lwm PCB boards muaj cai 1.5% .Cov muaj ntau zog yuav tsum rau tus nto mounting phaj rooj tsavxwm ntawm lub ipc-RB-276 (1992 version) .At tam sim no, lub warp degree ntawm daim ntawv tso cai ntawm txhua tus hluav taws xob PCB los ua ke cog, tsis muaj teeb meem ob los yog multi-txheej PCB, 1.6mm thickness, feem ntau yog 0,70 ~ 0.75%, ntau SMT, BGA phaj, cov yuav tsum tau yog 0.5% .Some electronics factories yog agitating rau ib tug 0.3 feem pua nce nyob rau hauv kev nkhaus cov qauv, thiab cov kev xeem kev nkhaus kev ntsuas raws li gb4677. 5-84 los yog ipc-TM-650.2.4.22b.Put PCB board rau ib tug qhia tau tseeb platform, lub xeem rab koob Warp degree ntawm cov loj tshaj plaws hauv zos, mus ntsuam xyuas lub cheeb ntawm lub koob, muab faib los ntawm tus nkhaus ntev ntawm PCB board, warp degree ntawm cov ntawv luam circuit Court board yuav xam.
3. warping thaum lub sij hawm raug txheej txheem
1. Engineering tsim: tus tsim ntawm tus printing Circuit Court board yuav tau muab sau tseg:
A. Cov kev kho ntawm lub prepreg ntawm lub khaubncaws sab nraud povtseg yuav tsum symmetrical, xws li rau laminates PCB Board , lub thickness ntawm 1 ~ 2 thiab 5 ~ 6 khaubncaws sab nraud povtseg yuav tsum muaj raws li tus naj npawb ntawm semi-solidified daim, txwv tsis pub tus txheej siab yuav yooj yim rau warp.
B. Multi-laminated tub ntxhais PCB thiab semi-kho cov ntsiav tshuaj yuav tsum tau siv nyob rau hauv tib neeg muag khoom cov khoom.
C. Lub cheeb tsam ntawm lub txheej A thiab B kab yuav tsum tau ze li possible.If Lub ntsej muag yog ib tug loj tooj liab nto, thiab B yog tsuas A ob peb kab, lub phaj yog ib qho yooj yim mus Warp tom qab etching.If ntawm ob sab ntawm lub kab cheeb tsam sib txawv yog loj heev, koj yuav ntxiv ib co tsis muaj ab tsi kab sib chaws on lub ntshiv sab, nyob rau hauv thiaj li yuav sib npaug.
2, Baking board ua ntej txiav:
CCL ci PCB board ua ntej txiav (150 degrees, 8 ± 2 teev) rau lub hom phiaj no yog los tshem tawm cov dej hauv lub rooj tsavxwm, thiab ua rau cov cob kho hauv phaj, ntxiv xa residual kev nyuaj siab nyob rau hauv phaj, uas yog yuav pab tau los mus tiv thaiv lub Rooj Tswjhwm Saib warping.At tam sim no, muaj ntau yam ob-tog PCB, multi-txheej PCB boards tseem ua raws li cov pre-blanking los yog post-ci step.But tseem muaj ib co PCB board raug Hoobkas, tam sim no lub PCB circuit Court board Hoobkas ci board lub sij hawm kev cai kuj inconsistent, xws li los ntawm 4 mus rau 10 teev, tswv yim uas cov tub kawm raws li zus tau tej cov luam Circuit Court boardthiab neeg thov rau warp degrees rau decide.Cut rau hauv daim los yog tom qab tag nrho cov daim ci ci cub txiav lub khoom, lub ob txoj kev yog ua tau, nws yog pom zoo kom txiav board tom qab txiav. Lub puab board yuav tsum kuj yuav kom qhuav board.
3. Cov warp thiab Weft ntawm prepreg:
Tom qab lub prepreg lamination, lub shrinkage nyob rau hauv lub warp thiab Weft qhia yog sib txawv, thiab cov warp thiab Weft qhia yuav tsum tau txawv thaum blanking thiab stacking.Otherwise, nws yog ib qho yooj yim mus Warp lub tiav lawm phaj tom qab laminating, txawm yog hais tias nws yog ib qho nyuaj mus kho. Multi-txheej PCB nkhaus vim li cas, muaj ntau yam ntawm cov lamination ntawm lub prepreg thaum lub warp thiab Weft tsis paub qhov txawv nruab nrab ntawm, indiscriminate luam tshwm sim los ntawm.
Yuav ua li cas kom paub qhov txawv ntawm latitude thiab longitude? Yob prepreg dov li cov kev taw qhia yog lub warp, thiab cov dav kev taw qhia yog tus Weft; tooj liab ci board rau qhov ntev sab ntawm lub latitudinal, luv luv sab yog warp, yog hais tias tsis paub tseeb tias mus xyuas nrog lub chaw tsim tshuaj paus los yog chaw muag khoom.
4. Kev nyuaj siab tom qab laminating:
multilayer PCB board, tom qab kom muaj raws li cov kub-nias txias-xovxwm txiav los yog milling burrs, ces ncaj nraim rau ci nyob rau hauv qhov cub 150 degrees Celsius rau 4 teev, yog li ntawd lub intraplate kev nyuaj siab maj tso thiab ua rau cov cob kho , cov kauj ruam no yog omitted.
5. Yuav tsum ua kom ncaj nyias phaj thaum plating:
0.4 ~ 0.6mm nyias multi-txheej PCB board rau hauv Circuit Court board plating thiab nraaj plating yuav tsum tau ua los ntawm tshwj xeeb nip yob, tsis siv neeg plating kab rau lub Feiba clip rau ntawm daim ntawv, muaj ib tug round bar mus rau tag nrho clip nyob rau Fiba lub hlua yog strung ua ke kom ncaj tag nrho cov ntawv luam circuit Court laug cam rau lub menyuam thiaj li hais tias cov Plated daim hlau yuav tsis deform. Qhov no tsis muaj kev ntsuas, tom qab plating nees nkaum los yog peb caug microns ntawm tooj liab txheej, daim ntawv yuav tsum khoov duav, thiab yooj yim rau kev khwv.
6. Board cua txias tom qab huab cua kub leveling:
Cov huab cua kub ntawm lub luam Circuit Court board yog cuam tshuam los ntawm lub siab kub ntawm cov tshuaj lo lub sab (txog 250 degrees Celsius). Tom qab nws yog muab tshem tawm, nws yuav tsum tau muab tso rau hauv lub tiaj marble los yog steel phaj kom txias lawm, thiab ces tus ncej-ua tshuab yog cleaned.This yog zoo rau lub warping ntawm boards.Some Hoobkas lug txhim khu cov brightness ntawm tus nto ntawm cov hlau lead , tin, lub Rooj Tswjhwm Saib mus rau hauv cov dej txias, tam sim ntawd tom qab huab cua kub leveling tom qab ib tug ob peb lub vib nas this nyob rau hauv lub reprocessing, xws li ib tug kub cev ib tug txias poob siab, rau tej hom ntawm cov laug cam yog yuav tsim kev nkhaus, fawm kib los yog blister.In tas li ntawd, cov huab cua floating txaj yuav muab ntxiv rau txias cov khoom siv.
7. nkhaus board ua:
Nyob rau hauv ib tug zoo-tswj Hoobkas, lub Rooj Tswjhwm Saib yuav muaj ib tug 100% flatness tshev rau qhov kawg soj ntsuam. Tag nrho tsis tsim nyog PCB boards yuav nqa tawm, muab tso rau hauv ib qhov cub, ci ntawm 150 degrees Celsius thiab hnyav siab rau 3 mus rau 6 teev, thiab nyob rau hauv lub siab ntawm tej yam ntuj tso cua txias. Ces tshem khoom lub phaj thiab tshem tawm cov PCB board, nyob rau hauv lub flatness check, thiaj li hais tias ib feem ntawm lub Rooj Tswjhwm Saib yuav raug cawm dim, thiab ib co luam Circuit Court laug cam yuav tsum tau ob tug mus rau peb lub sij hawm lub ci nyob rau hauv thiaj li yuav level.If saum toj no-hais anti -warping txheej txheem kev ntsuas yuav tsis siv, ib co board ci yog sib tsis tau, tsuas yog scrapped.