- Vim li cas yuav tsum tau ua tus vaj huam sib luag?
Tom qab cov qauv PCB, SMT yuav tsum tau nruab rau ntawm txoj kab sib dhos kom txuas cov khoom siv. Raws li kev ua lag luam uas yuav tsum tau ua ntawm cov kab sib dhos, txhua qhov chaw ua haujlwm SMT yuav npaj qhov loj tshaj plaws ntawm Circuit Court Board. Piv txwv li, yog tias qhov loj me me me dhau los yog loj heev, lub fixture rau kho cov PCB ntawm cov kab sib dhos tsis tuaj yeem tsau.
Yog li yog tias qhov loj me ntawm peb lub pcb nws tus kheej yog me dua li qhov loj uas tau teev los ntawm lub Hoobkas? Qhov ntawd txhais tau tias peb yuav tsum thooj cov laug cam ua ke, ntau cov kab ke hluav taws xob rau hauv ib qho.Both rau siab - cov phuam ceev tuaj yeem txhim kho kev ua tau zoo.
2.Pilthel lus
1) Txheej txheem loj
A. Txhawm rau pab txhawb kev ua, veneer ntug ntawm voids lossis cov txheej txheem yuav tsum yog r chamfering, feem ntau sib npaug φ tuaj yeem hloov kho.
B. PCB nrog ib lub rooj tsavxwm loj dua tsawg dua 100 hli × 70mm yuav tsum sib sau ua ke
2) cov duab tsis xwm yeem rau PCB
PCB nrog cov duab tsis xwm yeem thiab tsis muaj vaj huam sib luag yuav tsum tau ntxiv nrog kev muab cov khoom ntim tawm. Yog tias muaj lub qhov ntawm PCB loj dua los yog sib luag rau 5 hli × 5 hli, lub qhov yuav tsum ua kom tsis txhob muaj kev tiv thaiv kev tiv thaiv kev tiv thaiv kev paub thiab phaj thaum vuam. Qhov ua tiav thiab cov PCB qub yuav tsum txuas nrog los ntawm ob peb lub ntsiab lus ntawm ib sab thiab tshem tawm tom qab yoj soldering.
Thaum kev sib txuas ntawm cov cuab yeej cuab tam thiab PCB yog V-puab qhov sib hlub, tsis muaj cuab yeej sib txuas yog ≥2 hli;
3.Tus vaj huam sib luag
Cov kev taw qhia ntawm lub vaj huam sib luag yuav tsum tsim muaj nyob rau hauv cov kev taw qhia ntawm ntug kev sib kis tau tias muaj tsawg kawg nkaus ntawm "
Ntawm board tshwj xeeb ntawm board, them sai sai rau kev sib txuas ntawm pawg nyob sab nraud thiab sab hauv, sim ua kom sib txuas ntawm txhua kauj ruam sib cais nyob rau hauv ib kab.
4.Sov cov ntawv rau PCB vaj huam sib luag
Feem ntau, pcb ntau lawm yuav nqa tawm ntawm kev ua haujlwm hauv vaj huam sib luag ua haujlwm kom nce kev ua haujlwm ntawm SMT cov kab ntau lawm. Cov ntsiab lus twg yuav tsum tau them sai sai rau PCB los ua ke? Thov txheeb cov khoom hauv qab no:
1) Cov ncej sab nraud (clamping ntug) ntawm PCB vaj huam sib luag yuav raug tsim los kom ntseeg tau tias lub PCB vaj huam sib luag yuav tsis deform thaum tsau rau fixture.
2) PCB vaj huam sib luag duab yuav tsum muaj square ze li sai tau, pom zoo kom siv 2 × 2, 3 × 3, tab sis tsis ua rau lub rooj sib tham sib txawv (yin-yang).
3) Qhov dav ntawm vaj huam sib luag loj me ≤260MM (Siemens Line) lossis E≤300mm (FUJI kab). Yog tias yuav tsum tsis siv neeg xa tawm, 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 cuab tam, ntsuas lub cheeb tsam ≤ hli, xaim lossis SMT tsis raug tso cai tsis pub dhau 1 hli ntawm ntug kev Tooling qhov.
5) Qhov chaw nyob deb ntawm lub rooj tsavxwm me yuav tsum tau tswj hwm ntawm 75 hli thiab 145mm.
6) Thaum teeb tsa lub qhov rooj siv hluav taws xob, nws yog ib qho uas tawm ntawm qhov chaw vuam 1.5mm loj dua lub cuab tam.
7) Yuav tsum tsis muaj cov cuab yeej loj lossis cov cuab yeej tawm tsam ze ntawm kev sib txuas ntawm cov ncej sab nraud ntawm lub vaj huam sib luag ntawm vaj huam sib luag, thiab nruab nrab ntawm pawg vaj huam sib luag, thiab nruab nrab ntawm vaj huam sib luag thiab vaj huam sib luag. Dhau li, yuav tsum muaj ntau tshaj 0.5mm chaw nruab nrab ntawm cov cheebtsam thiab huab ntawm PCB Board kom ntseeg tau tias qhov haujlwm ua haujlwm ib txwm muaj ntawm cov cuab yeej txiav.
8) Plaub lub cuab tam nrog lub qhov taub ntawm 4mm ± 41 hli tau qhib kom paub tseeb tias nws yuav tsis muaj qhov siab nyob rau hauv plaub lub qhov yuav tsum yog qhov siab loj, lub qhov ntsa du tsis muaj burr.
9) Lub hauv paus ntsiab lus, qfp nrog spacing tsawg dua 0.65mm yuav tsum tau teeb tsa hauv cov cim pcbonal.Qhov muab cov txheej txheem siv rau PCB yuav tsum tau siv rau hauv cov kev sib txoos
10) Cov khoom loj yuav tsum muab tso rau cov posts lossis muab tso rau qhov, microphone, roj teeb interface, microswitch, lub taub hau Jack, muaj zog, thiab lwm yam.
