Super tuab tooj Multilayer PCB cov txheej txheem tsim khoom

1. Laminated qauv

Cov kev tshawb fawb tseem ceeb ntawm daim ntawv no yog ib qho ultra-thick tooj liab peb-txheej board, sab hauv tooj liab thickness yog 1.0 hli, sab nrauv tooj liab thickness yog 0.3 hli, thiab qhov tsawg kawg nkaus kab dav thiab kab sib nrug ntawm txheej txheej yog 0.5 hli. Cov txheej txheem laminated yog qhia hauv daim duab 1. Cov txheej txheej saum npoo yog FR4 tooj liab clad laminate (iav fiber ntau epoxy tooj liab clad laminate), nrog lub thickness ntawm 0.3 hli, ib leeg-sab etching kho, thiab cov nplaum txheej yog ib daim ntawv PP uas tsis ntws. (semi-kho daim ntawv), nrog ib tug tuab ntawm 0.1 hli, super tuab Lub phaj tooj liab yog embedded nyob rau hauv sib thooj lub qhov qauv ntawm FR-4 epoxy phaj.

Cov txheej txheem khiav ntawm ultra-thick tooj liab PCB ua yog qhia nyob rau hauv daim duab 3. Lub ntsiab machining muaj xws li nto thiab nruab nrab txheej milling, tuab tooj liab phaj tooj milling. Tom qab kev kho saum npoo, nws yog stacked nyob rau hauv tag nrho cov pwm kom sov thiab nias, thiab tom qab demolding, ua raws li cov txheej txheem PCB cov txheej txheem ua tiav cov khoom tiav.

2. Cov txheej txheem kev siv tshuab tseem ceeb

2.1 Ultra-thick tooj liab sab hauv lamination tshuab

Super-thick tooj liab sab hauv lamination: Yog tias tooj liab ntawv siv rau super-thick tooj liab, nws yuav nyuaj rau ua tiav qhov tuab no. Nyob rau hauv daim ntawv no, lub super-thick tooj liab sab hauv txheej siv 1 hli electrolytic tooj liab phaj, uas yog ib qho yooj yim mus yuav rau cov pa cov ntaub ntawv thiab yog ncaj qha ua los ntawm ib tug milling tshuab; sab nrauv ntawm lub phaj tooj liab sab hauv tib lub thickness ntawm FR4 board (iav fiber ntau epoxy board) yog siv rau kev ua thiab molding raws li tag nrho cov filling. Txhawm rau ua kom yooj yim rau lamination thiab xyuas kom meej tias nws haum zoo nrog lub periphery ntawm lub phaj tooj liab, qhov sib txawv ntawm ob qhov contours raws li qhia hauv cov qauv ntawm daim duab 4 yog tswj ntawm 0 ~ 0.2 Hauv hli. Raws li cov nyhuv ntawm FR4 lub rooj tsavxwm, qhov teeb meem tooj liab thickness ntawm ultra-thick tooj liab board yog daws, thiab nruj nreem nias thiab rwb thaiv tsev teeb meem tom qab lamination yog guaranteed, thiaj li hais tias tus tsim ntawm lub puab tooj liab thickness yuav ntau dua 0.5 hli. .

2.2 Super tuab tooj liab blackening tshuab

Qhov saum npoo ntawm ultra-thick tooj liab yuav tsum tau blackened ua ntej lamination. Lub blackening ntawm lub phaj tooj liab tuaj yeem ua rau kom muaj kev sib cuag ntawm thaj chaw ntawm tooj liab thiab cov resin, thiab ua rau kom cov dej ntws ntawm cov dej kub kub rau cov tooj liab, kom cov resin tuaj yeem nkag mus rau hauv cov txheej txheem oxide thiab ua kom muaj kev ua tau zoo. tom qab hardening. Lub zog adhesion txhim kho cov nyhuv nias. Nyob rau tib lub sijhawm, nws tuaj yeem txhim kho qhov tshwm sim ntawm laminating dawb qhov tshwm sim thiab cov xim dawb thiab npuas tshwm sim los ntawm kev ntsuas ci (287 ℃ ± 6 ℃). Qhov tshwj xeeb blackening tsis muaj nyob rau hauv Table 2.

2.3 Super tuab tooj liab PCB lamination tshuab

Vim yog kev tsim khoom yuam kev hauv cov tuab ntawm sab hauv super-thick tooj liab phaj thiab FR-4 phaj siv rau qhov chaw nyob ib puag ncig, lub thickness tsis tuaj yeem ua tau zoo ib yam. Yog tias cov txheej txheem lamination yog siv rau lamination, nws yog ib qho yooj yim los tsim lamination dawb me ntsis, delamination thiab lwm yam tsis xws luag, thiab lub lamination yog qhov nyuaj. . Yuav kom txo tau qhov nyuaj ntawm nias lub ultra-thick txheej tooj liab thiab xyuas kom meej qhov tseeb, nws tau raug soj ntsuam thiab xyuas kom meej siv ib qho tseem ceeb pressing pwm qauv. Lub sab sauv thiab qis ntawm cov pwm yog ua los ntawm cov pwm steel, thiab silicone cushion yog siv los ua cov txheej txheem nruab nrab. Cov txheej txheem tsis xws li kub, siab, thiab siab tuav lub sij hawm ua tiav cov nyhuv lamination, thiab kuj daws cov teeb meem kev teeb meem ntawm cov pob dawb thiab delamination ntawm ultra-thick tooj liab lamination, thiab ua tau raws li qhov yuav tsum tau lamination ntawm ultra-thick tooj liab PCB boards.

(1) Super tuab tooj liab PCB lamination txoj kev.

Lub stacking theem ntawm cov khoom nyob rau hauv lub ultra-thick tooj liab laminate pwm yog qhia nyob rau hauv daim duab 5. Vim tsis muaj fluidity ntawm tsis-flowable PP resin, yog hais tias cov pa cladding khoom siv kraft daim ntawv, PP daim ntawv yuav tsis tau uniformly nias, ua rau muaj qhov tsis xws luag xws li pob dawb thiab delamination tom qab lamination. Cov khoom siv tooj liab PCB tuab yuav tsum tau siv rau hauv cov txheej txheem lamination Raws li cov txheej txheem tsis tseem ceeb, cov silica gel ncoo plays lub luag haujlwm sib luag hauv kev sib faib lub siab thaum nias. Tsis tas li ntawd, txhawm rau daws qhov teeb meem nias, qhov ntsuas siab hauv lub tshuab laminator tau hloov kho los ntawm 2.1 Mpa (22 kg / cm²) mus rau 2.94 Mpa (30 kg / cm²), thiab qhov ntsuas kub tau hloov kho rau qhov zoo tshaj plaws fusion kub raws li. Cov yam ntxwv ntawm daim ntawv PP 170 ° C.

(2) Cov txheej txheem lamination ntawm ultra-thick tooj liab PCB yog qhia hauv Table 3.

(3) Cov nyhuv ntawm super tuab tooj liab PCB lamination.

Tom qab kev sim ua raws li Tshooj 4.8.5.8.2 ntawm GJB362B-2009, yuav tsum tsis txhob muaj qhov blistering thiab delamination uas dhau Tshooj 3.5.1.2.3 (qhov tsis xws luag hauv qab) tso cai thaum kuaj PCB raws li 4.8.2. Cov qauv PCB ua tau raws li qhov yuav tsum tau ua thiab qhov loj ntawm 3.5.1, thiab yog micro-sectioned thiab tshuaj xyuas raws li 4.8.3, uas ua tau raws li qhov yuav tsum tau ua ntawm 3.5.2. Cov nyhuv slicing yog pom nyob rau hauv daim duab 6. Kev txiav txim los ntawm cov xwm txheej ntawm lub lamination daim kab xev, cov kab yog puv puv thiab tsis muaj micro-slit npuas.

2.4 Super tuab tooj liab PCB ntws kua nplaum tswj tshuab

Sib txawv ntawm kev ua PCB dav dav, nws cov duab thiab cov cuab yeej txuas txuas tau ua tiav ua ntej lamination. Yog tias cov kua nplaum ntws hnyav, nws yuav cuam tshuam rau qhov sib npaug thiab qhov loj ntawm kev sib txuas, thiab cov tsos thiab kev siv yuav tsis ua raws li qhov yuav tsum tau ua; cov txheej txheem no kuj tau raug sim hauv cov txheej txheem kev txhim kho. Cov txheej txheem ntawm cov duab milling tom qab nias, tab sis tom qab cov duab milling yuav tsum tau tswj nruj me ntsis, tshwj xeeb tshaj yog rau kev ua cov txheej txheem ntawm cov tuab tooj liab sib txuas, qhov tob precision tswj yog nruj heev, thiab tus nqi dhau yog tsawg heev.

Xaiv cov ntaub ntawv sib txuas tsim nyog thiab tsim cov qauv tsim khoom tsim nyog yog ib qho nyuaj hauv kev tshawb fawb. Txhawm rau daws qhov teeb meem ntawm qhov pom ntawm cov kua nplaum dhau los ntawm cov prepregs zoo tib yam tom qab lamination, prepregs nrog cov dej tsis muaj dej (Cov txiaj ntsig: SP120N) yog siv. Cov khoom nplaum muaj cov yam ntxwv ntawm cov dej tsis tshua muaj dej, ua kom yooj yim, zoo heev thaum tshav kub kub thiab hluav taws xob, thiab Raws li cov yam ntxwv ntawm cov kua nplaum dhau, lub contour ntawm prepreg ntawm ib txoj hauj lwm tshwj xeeb yog nce, thiab cov contour ntawm ib qho kev ua tiav. los ntawm kev txiav thiab kos duab. Nyob rau tib lub sijhawm, cov txheej txheem ntawm kev tsim ua ntej thiab tom qab nias yog pom tau, thiab cov duab yog tsim tom qab nias, tsis tas yuav tsum tau CNC milling dua. Qhov no daws cov teeb meem ntawm cov kua nplaum ntws tom qab PCB laminated, thiab xyuas kom meej tias tsis muaj cov kua nplaum ntawm qhov sib txuas tom qab lub phaj tooj liab super-tuab yog laminated thiab lub siab nruj.

3. Cov nyhuv tiav ntawm ultra-thick tooj liab PCB

3.1 Ultra-thick tooj liab PCB khoom specifications

Super-thick tooj liab PCB khoom specification parameter lub rooj 4 thiab cov khoom tiav cov nyhuv yog pom nyob rau hauv daim duab 7.

3.2 Tiv thaiv qhov ntsuas hluav taws xob

Cov ncej nyob rau hauv ultra-thick tooj liab PCB qauv tau sim rau qhov muaj zog tiv taus. Qhov ntsuas hluav taws xob yog AC1000V, thiab tsis muaj kev tawm tsam lossis flashover hauv 1 min.

3.3 Kev ntsuas kub tam sim no nce siab

Tsim cov khoom sib txuas ntawm cov phaj tooj liab txuas rau txhua tus ncej ntawm ultra-thick tooj liab PCB qauv hauv series, txuas mus rau lub tshuab hluav taws xob siab tam sim no, thiab sim sib cais raws li qhov ntsuas tam sim no. Cov txiaj ntsig kev xeem tau qhia hauv Table 5:

Los ntawm qhov kub thiab txias nyob rau hauv Table 5, tag nrho cov kub nce ntawm ultra-thick tooj liab PCB yog qhov qis, uas tuaj yeem ua tau raws li qhov yuav tsum tau siv tiag tiag (feem ntau, qhov ntsuas kub yuav tsum qis dua 30 K). Qhov kub siab tam sim no nce ntawm ultra-thick tooj liab PCB muaj feem xyuam rau nws cov qauv, thiab qhov kub ntawm qhov sib txawv ntawm cov tuab tooj liab yuav muaj qee qhov sib txawv.

3.4 Thermal stress test

Cov kev xav tau ntawm kev ntsuas kub siab: Tom qab ntsuas qhov ntsuas kub ntawm cov qauv raws li GJB362B-2009 Kev Qhia Tshwj Xeeb rau Rigid Printed Boards, kev tshuaj xyuas pom pom tias tsis muaj qhov tsis xws luag xws li delamination, blistering, pad warping, thiab pob dawb.

Tom qab cov tsos thiab qhov loj ntawm cov qauv PCB ua tau raws li qhov yuav tsum tau ua, nws yuav tsum tau microsectioned. Vim tias cov txheej hauv tooj liab ntawm cov qauv no yog tuab heev uas yuav tsum tau muab faib ua metallographically, cov qauv raug kuaj xyuas qhov ntsuas kub ntawm 287 ℃ ± 6 ℃, thiab tsuas yog nws cov tsos yog kuaj pom pom.

Cov txiaj ntsig kev xeem yog: tsis muaj delamination, blistering, pad warping, pob dawb thiab lwm yam tsis xws luag.

4. Ntsiab lus

Kab lus no muab cov txheej txheem tsim khoom rau ultra-thick tooj liab multilayer PCB. Los ntawm kev siv thev naus laus zis thiab kev txhim kho cov txheej txheem, nws ua tau zoo daws qhov kev txwv tam sim no ntawm tooj liab tuab ntawm ultra-thick tooj liab multilayer PCB, thiab kov yeej cov teeb meem kev ua haujlwm hauv qab no:

(1) Ultra-thick tooj liab puab lamination tshuab: Nws zoo daws qhov teeb meem ntawm ultra-thick tooj liab cov khoom xaiv. Kev siv cov txheej txheem ua ntej milling tsis tas yuav tsum tau etching, uas zoo zam cov teeb meem ntawm cov tooj liab tuab; FR-4 filling tshuab ua kom lub siab ntawm cov txheej sab hauv Kaw nruj thiab rwb thaiv tsev teeb meem;

(2) Ultra-thick tooj liab PCB lamination tshuab: zoo daws qhov teeb meem ntawm cov pob dawb thiab delamination hauv lamination, thiab pom cov txheej txheem nias tshiab thiab kev daws teeb meem;

(3) Super-thick tooj liab PCB ntws kua nplaum tswj tshuab: Nws zoo daws qhov teeb meem ntawm cov kua nplaum ntws tom qab nias, thiab xyuas kom meej tias qhov kev siv ntawm cov khoom ua ntej milling thiab nias.