Yuav tiv thaiv li cas Circuit Court board yoo mov

1 、 Vim li cas thiaj yuav tsum muaj lub rooj tsav xwm hauv vaj huam sib luag tiaj tus

Ntawm kab ntawv tsis siv neeg, yog tias lub rooj tsav xwm luam tawm tsis tiaj tus, nws yuav ua rau qhov chaw tsis raug, cov khoom siv tsis tuaj yeem tso rau hauv lub qhov thiab qhov chaw ntim khoom ntawm lub rooj tsavxwm, thiab txawm ua rau lub tshuab tsis siv neeg tsis zoo. Lub rooj tsavxwm tau teeb tsa nrog cov khoom sib dhos tau khoov tom qab vuam, thiab cov khoom tivthaiv ko taw nyuaj rau txiav ncaj thiab zoo. Lub Rooj Tswjhwm Saib tsis tuaj yeem teeb tsa ntawm lub chassis lossis lub qhov (socket) hauv lub tshuab, yog li nws kuj tseem muaj teeb meem heev rau lub rooj sib dhos ua haujlwm kom ntsib lub rooj tsavxwm. Tam sim no, cov laug cam luam tawm tau nkag mus rau lub sijhawm ntawm kev teeb tsa saum npoo thiab teeb tsa chip, thiab cov rooj sib txoos cog yuav tsum muaj ntau thiab nruj dua qhov xav tau rau lub rooj tsavxwm.

2 、 Txuj ci thiab ntsuas txoj hauv kev rau warpage

Raws li Asmeskas ipc-6012 (1996 tsab ntawv) <<kev txheeb xyuas thiab Kev Ua Haujlwm Tshwj Xeeb rau cov laug cam uas tau luam tawm>>, qhov siab tshaj plaws tso cai ua tsov rog thiab cuam tshuam rau cov nplais saum cov ntawv luam tawm yog 0.75%, thiab 1.5% rau lwm cov laug cam. Qhov no txhim kho qhov yuav tsum tau ua rau cov nplais saum cov ntawv luam tawm piv nrog ipc-rb-276 (1992 tsab). Tam sim no, kev tso cai ua tsov rog ntawm txhua lub rooj sib txoos hluav taws xob, txawm tias ob tog lossis ntau txheej, yog 1.6 hli tuab, feem ntau yog 0.70 ~ 0.75%. Rau ntau lub SMT thiab BGA cov laug cam, nws yuav tsum yog 0.5%. Qee lub chaw tsim hluav taws xob tau tawm tswv yim kom nce tus txheej txheem ntawm warpage rau 0.3%. Txoj hauv kev ntawm kev xeem warpage yuav tsum ua raws gb4677.5-84 lossis ipc-tm-650.2.4.22b. Muab daim ntawv luam tawm ntawm lub platform uas tau txheeb xyuas, ntxig lub koob txhaj tshuaj rau hauv qhov chaw nrog qhov loj tshaj warpage, thiab faib txoj kab uas hla ntawm txoj kev ntsuas koob los ntawm qhov ntev ntawm qhov nkhaus ntawm ntug ntawm lub rooj tsav xwm luam tawm los laij cov warpage ntawm pawg thawj coj saib luam tawm.

3 、 Anti warping phaj thaum tsim khoom

1. Kev tsim vaj tsev: kev ceev faj hauv PCB Tsim:

A. Kev npaj cov ntawv kho ib nrab ntawm cov khaubncaws sab nraud povtseg yuav tsum sib npaug. Piv txwv li, tuab ntawm txheej 1 ~ 2 thiab 5 ~ 6 ntawm rau txheej yuav tsum zoo ib yam nrog cov ntawv kho ib nrab, txwv tsis pub nws yooj yim rau warp tom qab lamination.

B. Cov khoom lag luam ntawm tib tus neeg xa khoom yuav tsum raug siv rau ntau pawg tub ntxhais ua haujlwm thiab ib nrab ntawv kho.

C. Thaj chaw ntawm kab qauv ntawm saum npoo a thiab nto B ntawm txheej txheej sab nrauv yuav tsum nyob ze li sai tau. Yog tias ib sab yog tooj liab loj thiab nto B tsuas yog siv ob peb lub xov hlau, cov ntawv luam tawm tau yooj yim rau warp tom qab kos. Yog tias kab kab sib txawv ntawm ob sab loj heev, qee qhov kev ywj pheej tuaj yeem muab ntxiv rau ntawm qhov tsis sib xws rau qhov sib npaug.

2. Ua kom qhuav phaj ua ntej blanking:

Lub hom phiaj ntawm ziab cov tooj liab ua kom qhuav ua ntej tsis muaj dab tsi (150 ° C, lub sijhawm 8 ± 2 teev) yog tshem tawm cov dej noo hauv phaj, ua kom tiav cov pob zeb hauv lub phaj thiab ntxiv kev tshem tawm cov kev nyuab siab hauv phaj, uas yog qhov pab tau los tiv thaiv phaj warpage. Tam sim no, ntau daim txiag ob sab thiab ntau txheej tseem ua raws cov qib kom qhuav ua ntej lossis tom qab khoob. Txawm li cas los xij, muaj qhov tshwj xeeb hauv qee lub tsev tsim khoom phaj. Tam sim no, cov txheej txheem kom qhuav ntawm PCB cov chaw tsim khoom kuj tseem tsis sib xws, suav txij li 4 txog 10 teev. Nws raug pom zoo los txiav txim siab raws qib qib ntawm cov ntawv luam tawm tau tsim thiab cov neeg siv khoom xav tau rau kev ua tsov rog. Ob txoj kev yog ua tau. Nws raug nquahu kom qhuav lub rooj tsavxwm tom qab txiav. Cov phaj sab hauv yuav tsum qhuav.

3. Ntev thiab latitude ntawm cov ntawv kho ib nrab:

Cov ntaub qhwv thiab weft shrinkage ntawm cov ntawv kho ib nrab tom qab lamination sib txawv, yog li warp thiab weft yuav tsum muaj qhov txawv thaum lub sij hawm blanking thiab lamination. Txwv tsis pub, nws yog ib qho yooj yim ua rau warpage ntawm cov phaj tiav tom qab lamination, thiab nws yog qhov nyuaj rau kho txawm tias lub siab tau thov kom qhuav lub phaj. Ntau qhov laj thawj rau kev ua tsov rog ntawm cov laug cam ntau txheej yog tshwm sim los ntawm qhov tsis paub meej ntev thiab qhov nruab nrab ntawm cov ntawv kho ib nrab thaum lamination.

Yuav ua li cas kom paub qhov txawv ntawm qhov ntev thiab latitude? Cov lus taw qhia ntawm cov ntawv kho ib nrab khoov yog qhov kev taw qhia warp, thiab cov lus qhia dav yog qhov taw qhia weft; Rau cov ntawv ci tooj liab, sab ntev yog nyob rau hauv qhov taw qhia weft, thiab sab luv yog nyob rau hauv qhov kev taw qhia warp. Yog tias koj tsis paub meej, koj tuaj yeem tshawb xyuas nrog cov chaw tsim khoom lossis cov chaw muag khoom.

4. Kev nyuaj siab nyem tom qab lamination:

Tom qab kub nias thiab txias nias, tshem tawm ntau lub rooj tsavxwm, txiav lossis zom tawm qhov tawg, thiab tom qab ntawd muab tso rau hauv lub qhov cub ntawm 150 ℃ rau 4 teev, thiaj li maj mam tso kev ntxhov siab hauv lub rooj tsavxwm thiab kho cov tshuaj txhuam kom tiav. . Cov kauj ruam no tsis tuaj yeem raug rho tawm.

5. Daim ntawv yuav tsum tau ncaj thaum lub sij hawm electroplating:

Thaum 0.4 ~ 0.6mm ultra-thin multilayer board tau siv rau phaj plating electroplating thiab cov qauv electroplating, tshwj xeeb pinch cov menyuam yuav tsum tau ua. Tom qab clamping nyias daim hlau ntawm lub dav hlau ya ntawm txoj kab hluav taws xob tsis siv neeg, siv tus pas nrig tig rau txoj hlua khawm ntawm txhua lub dav hlau ya, kom ncaj txhua daim phiaj ntawm cov menyuam, kom cov phaj plated yuav tsis deform. Yog tsis muaj qhov ntsuas no, phaj nyias yuav khoov tom qab electroplating txheej tooj liab ntawm 20 lossis 30 microns, thiab nws nyuaj rau kho.

6. Cua txias ntawm phaj tom qab cua sov qib:

Thaum cov ntawv luam tawm tau ua kom sov los ntawm huab cua kub, nws cuam tshuam los ntawm qhov kub ntawm lub dab da dej (li 250 ℃), thiab tom qab ntawd nws yuav tsum tau muab tso rau ntawm lub tiaj tiaj marble lossis steel phaj rau qhov txias txias, thiab xa mus rau lub tshuab ua haujlwm rau kev ntxuav. Qhov no yog qhov zoo rau kev tiv thaiv warping ntawm pawg thawj coj saib. Txhawm rau txhawm rau txhim kho qhov ci ntawm cov hlau lead saum npoo, qee lub chaw tsim khoom tau muab daim hlau tso rau hauv cov dej txias tam sim tom qab huab cua kub, thiab coj lawv tawm rau kev kho tom qab ob peb feeb. Qhov no ib qho cua sov thiab ib qho kev cuam tshuam txias yuav zoo li ua rau warpage, delamination lossis blistering ntawm qee hom phaj. Tsis tas li ntawd, lub txaj huab cua ntab tuaj yeem teeb tsa ntawm cov cuab yeej kom txias.

7. Kho cov phaj warping:

Hauv ib lub Hoobkas uas muaj kev tswj hwm zoo, 100% kev tshuaj xyuas nruj yuav raug ua thaum lub sijhawm tshuaj xyuas zaum kawg ntawm cov laug cam. Txhua lub rooj tsis tsim nyog yuav raug xaiv tawm, muab tso rau hauv qhov cub, qhuav ntawm 150 ℃ thiab nyob rau qhov hnyav li 3 ~ 6 teev, thiab txias ib txwm nyob hauv qhov hnyav. Tom qab ntawd tshem tawm lub rooj tsavxwm tom qab nyem siab thiab txheeb xyuas qhov tiaj. Ua li no, qee cov laug cam tuaj yeem txuag tau. Qee cov laug cam yuav tsum tau qhuav thiab nias ob zaug lossis peb zaug kom tau qib. Lub tshuab pneumatic phaj ntswj thiab ua kom lub tshuab ncaj ncaj sawv cev los ntawm Shanghai Huabao tau siv los ntawm Shanghai Tswb los txhawm rau kho qhov warpage ntawm Circuit board. Yog tias cov txheej txheem tiv thaiv txheej txheem txheej txheem txheej txheem saum toj no tsis tau ua tiav, qee cov laug cam tsis muaj txiaj ntsig thiab tsuas yog tuaj yeem muab pov tseg.