Thaum tsim PCB pads hauv PCB board tsim , nws yog ib qho tsim nyog yuav tsum tsim kom nruj raws li cov kev cai thiab cov qauv.Vim tias nyob rau hauv SMT thaj ua haujlwm, kev tsim ntawm PCB ncoo tseem ceeb heev.Tus tsim ntawm lub ncoo yuav cuam tshuam ncaj qha rau cov solderability, stability thiab kub hloov ntawm cov khoom.Nws muaj feem xyuam rau qhov ua tau zoo ntawm kev ua thaj chaw.Tom qab ntawd dab tsi yog PCB pad tsim qauv? 1. Cov qauv tsim rau cov duab thiab qhov loj ntawm PCB ncoo: 1. Hu rau lub tsev qiv ntawv PCB txheem pob. 2. Qhov tsawg kawg nkaus ib sab ntawm lub ncoo tsis pub tsawg tshaj 0.25mm, thiab qhov siab tshaj plaws ntawm tag nrho cov ncoo tsis ntau tshaj 3 npaug ntawm cov khoom siv aperture. 3. Sim xyuas kom meej tias qhov kev ncua deb ntawm cov npoo ntawm ob lub ncoo yog ntau dua 0.4 hli. 4. Cov ntaub qhwv nrog apertures tshaj 1.2mm los yog ncoo diameters tshaj 3.0mm yuav tsum tau tsim raws li pob zeb diamond-puab los yog quincunx-shaped pads 5. Nyob rau hauv cov ntaub ntawv ntawm cov xov hlau ntom ntom, nws raug nquahu kom siv oval thiab oblong txuas daim hlau.Txoj kab uas hla lossis qhov dav tsawg kawg nkaus ntawm ib lub vaj huam sib luag yog 1.6 hli;qhov tsis muaj zog-tam sim no Circuit Court ncoo ntawm ob sab board tsuas yog yuav tsum tau ntxiv 0.5mm rau lub qhov taub.Ib lub ncoo loj dhau tuaj yeem ua rau tsis tsim nyog txuas ntxiv.
PCB ncoo ntawm tus qauv loj:
Lub puab qhov ntawm lub ncoo feem ntau tsis tsawg dua 0.6mm, vim hais tias lub qhov me dua 0.6mm tsis yooj yim rau txheej txheem thaum xuas nrig ntaus tuag.Feem ntau, txoj kab uas hla ntawm cov hlau pin ntxiv rau 0.2 hli yog siv los ua lub puab lub qhov taub ntawm lub ncoo, xws li txoj kab uas hla ntawm cov hlau tus pin ntawm cov resistor Thaum nws yog 0.5 hli, lub puab qhov taub ntawm lub ncoo sib haum rau 0.7 hli. , thiab lub ncoo txoj kab uas hla nyob ntawm lub puab lub qhov taub.
Peb, cov ntsiab lus tsim kev ntseeg siab ntawm PCB ncoo:
1. Symmetry, txhawm rau ua kom muaj qhov sib npaug ntawm qhov nro ntawm cov molten solder, cov ntaub qhwv ntawm ob qhov kawg yuav tsum sib npaug.
2. Npog qhov sib nrug.Qhov loj lossis me me qhov sib nrug yuav ua rau muaj qhov tsis xws luag.Yog li ntawd, xyuas kom meej tias qhov sib nrug ntawm cov khoom xaus lossis cov pins thiab cov ntaub qhwv yog tsim nyog.
3. Qhov luaj li cas ntawm lub ncoo, qhov seem ntawm qhov loj ntawm cov khoom kawg lossis tus pin thiab lub ncoo tom qab sib tshooj yuav tsum xyuas kom meej tias cov hlua khi tuaj yeem ua rau meniscus.
4. Qhov dav ntawm lub ncoo yuav tsum yog tib yam li qhov dav ntawm lub ntsiab lus lossis tus pin.
Kho PCB ncoo tsim, yog tias muaj qhov me me ntawm skew thaum lub sijhawm ua haujlwm, nws tuaj yeem raug kho vim qhov nro ntawm cov molten solder thaum lub sij hawm reflow soldering.Yog hais tias lub PCB ncoo tsim tsis raug, txawm tias qhov kev tso kawm yog qhov tseeb heev, qhov tsis xws luag xws li kev tiv thaiv txoj haujlwm offset thiab ncua kev txuas txuas yuav yooj yim tshwm sim tom qab reflow soldering.Yog li ntawd, thaum tsim PCB, PCB ncoo tsim yuav tsum tau ceev faj heev.
1.6mm thickness tseeb ntsuab solder daim npog qhov ncauj kub ntiv tes PCB board FR4 CCL Circuit Board
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