- Vim li cas thiaj yuav tsum tau ua lub vaj huam sib luag?
Tom qab tsim PCB, SMT yuav tsum tau nruab rau ntawm kab sib dhos kom txuas cov khoom sib txuas. Raws li cov txheej txheem ua tiav ntawm cov kab sib dhos, txhua qhov SMT ua lub Hoobkas yuav qhia qhov tsim nyog tshaj plaws ntawm lub rooj tsavxwm. Piv txwv li, yog tias qhov loj me me dhau los yog loj dhau, qhov kev txhim kho rau kev kho pcb ntawm cov kab sib dhos tsis tuaj yeem kho.
Yog li yog tias qhov luaj li cas ntawm peb cov PCB nws tus kheej yog me dua li qhov loj ntawm lub Hoobkas? Qhov ntawd txhais tau hais tias peb yuav tsum tau ua ke cov rooj sib tham hauv Circuit Court, ntau lub rooj sib tham hauv ib thooj.Ob leeg rau kev kub ceev mounter thiab yoj soldering tuaj yeem txhim kho kev ua haujlwm zoo.
2. Vaj huam sib luag
1) Qhia qhov loj me
A. Txhawm rau kom yooj yim rau kev ua, veneer ntug ntawm voids lossis txheej txheem yuav tsum yog R chamfering, feem ntau sib npaug Φ txoj kab uas hla 5, cov phaj me me tuaj yeem hloov kho.
B. PCB nrog ib lub rooj tsav xwm loj tsawg dua 100mm × 70mm yuav tsum tau sib sau ua ke
2) Irregular Shape rau PCB
PCB nrog cov duab tsis zoo thiab tsis muaj vaj huam sib luag yuav tsum tau ntxiv nrog cov cuab yeej siv. Yog tias muaj lub qhov ntawm PCB ntau dua lossis sib npaug ntawm 5mm × 5mm, lub qhov yuav tsum ua kom tiav ua ntej hauv kev tsim kom tsis txhob deformation ntawm mantineer thiab phaj thaum vuam. Qhov ua tiav thiab qhov qub PCB yuav tsum tau txuas nrog ntau lub ntsiab lus ntawm ib sab thiab tshem tawm tom qab yoj soldering.
Thaum qhov kev sib txuas ntawm cov cuab yeej sawb thiab PCB yog v-shaped zawj, qhov kev ncua deb ntawm lub npoo sab nraud ntawm lub cuab yeej thiab v-shaped zawj yog ≥2 hli; Thaum qhov kev sib txuas ntawm cov txheej txheem ntug thiab PCB yog lub qhov thwj, tsis muaj cov khoom siv. los yog Circuit Court yuav tsum tau teem nyob rau hauv 2 hli ntawm lub stamp qhov.
3. Vaj huam sib luag
Cov kev taw qhia ntawm lub vaj huam sib luag yuav tsum tau tsim nyob rau hauv parallel mus rau cov kev taw qhia ntawm ntug ntawm lub kis tau tus mob, tshwj tsis yog qhov luaj li cas tsis tau raws li qhov yuav tsum tau ntawm saum toj no loj ntawm lub vaj huam sib luag.Nws yog feem ntau yuav tsum tau tus naj npawb ntawm "v-cut" los yog stamp qhov kab yog tsawg dua los yog sib npaug rau 3 (tshwj tsis yog rau cov laug cam ntev thiab nyias).
Ntawm lub rooj tsavxwm tshwj xeeb, ua tib zoo saib xyuas kev sib txuas ntawm sub-board thiab sub-board, sim ua kom muaj kev sib txuas ntawm txhua kauj ruam sib cais hauv ib kab.
4.Qee cov ntawv rau PCB vaj huam sib luag
Feem ntau, PCB ntau lawm yuav ua tiav qhov kev ua haujlwm hu ua Panelization kom nce kev ua haujlwm ntawm SMT ntau lawm kab. Cov ntsiab lus dab tsi yuav tsum tau them rau hauv PCB los ua ke? Thov xyuas cov hauv qab no:
1) Sab nrauv (clamping edge) ntawm PCB vaj huam sib luag yuav tsum tau tsim nyob rau hauv ib lub voj kaw kom paub tseeb tias lub vaj huam sib luag PCB yuav tsis deform thaum kho rau lub fixture.
2) PCB vaj huam sib luag zoo xav tau square kom ze li sai tau, pom zoo kom siv 2 × 2, 3 × 3, …… vaj huam sib luag, tab sis tsis ua rau lub rooj sib txawv (yin-yang).
3) Qhov dav ntawm vaj huam sib luag loj ≤260mm (SIEMENS kab) lossis ≤300mm (FUJI kab). Yog tias xav tau kev xa tawm tsis siv neeg, qhov dav x ntev ≤125mm × 180mm rau lub vaj huam sib luag loj.
4) Txhua lub rooj tsav xwm me me hauv PCB vaj huam sib luag yuav tsum muaj tsawg kawg yog peb lub qhov cuab yeej, 3≤ lub qhov taub ≤ 6mm, tsis pub siv hluav taws xob lossis SMT tsis pub dhau 1 hli ntawm ntug tooling qhov.
5) Qhov nruab nrab ntawm qhov nruab nrab ntawm lub rooj tsavxwm me yuav tsum tswj ntawm 75mm thiab 145mm.
6) Thaum teeb tsa cov cuab yeej siv lub qhov, nws yog ib qho uas yuav tsum tawm ntawm qhov chaw qhib vuam 1.5 hli loj dua nyob ib ncig ntawm lub qhov cuab yeej.
7) Yuav tsum tsis txhob muaj cov khoom siv loj lossis cov khoom siv tawm ze ze ntawm qhov chaw sib txuas ntawm sab nrauv ntawm lub vaj huam sib luag thiab lub vaj huam sib luag sab hauv, thiab nruab nrab ntawm lub vaj huam sib luag thiab lub vaj huam sib luag. Tsis tas li ntawd, yuav tsum muaj ntau tshaj 0.5 hli qhov chaw nruab nrab ntawm cov khoom thiab cov ntug ntawm PCB pawg thawj coj saib kom ntseeg tau tias kev ua haujlwm zoo ntawm cov cuab yeej txiav.
8) Plaub qhov cuab yeej nrog lub qhov taub ntawm 4mm ± 0.01mm tau qhib rau ntawm plaub lub kaum sab xis ntawm cov txheej txheem ntawm lub vaj huam sib luag.Lub zog ntawm lub qhov yuav tsum yog nruab nrab los xyuas kom meej tias nws yuav tsis tawg thaum lub sij hawm txheej txheem ntawm sab sauv thiab qis. phaj; Aperture thiab txoj hauj lwm raug yuav tsum siab, lub qhov phab ntsa du tsis muaj burr.
9) Raws li txoj cai, QFP nrog qhov sib nrug tsawg dua 0.65mm yuav tsum tau muab tso rau hauv nws txoj kab pheeb ces kaum.Qhov kev qhia siv cov cim siv rau PCB subboard ntawm lub rooj sib txoos yuav tsum tau siv ua khub, teem diagonally ntawm lub positioning ntsiab.
10) Cov khoom loj yuav tsum muaj qhov chaw tso lossis qhov chaw, xws li I / O interface, microphone, roj teeb interface, microswitch, lub mloog pob ntseg, lub cev muaj zog, thiab lwm yam.