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Tshaj tawm: Lub Ob Hlis 15, 2022

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Tags:pcb, pcbs, pcba, pcb sib dhos, smt, stencil

PCB Stencil yog dab tsi?

PCB Stencil, tseem hu ua Steel mesh, yog ib daim ntawv ntawm stai

nless hlau nrog laser txiav qhib siv los hloov qhov tseeb ntawm cov tshuaj txhuam hniav mus rau qhov chaw raug xaiv ntawm PCB liab qab rau qhov chaw mount qhov chaw.Lub stencil yog tsim los ntawm stencil ncej, hlau mesh thiab steel ntawv.Muaj ntau lub qhov nyob hauv stencil, thiab cov haujlwm ntawm cov qhov no sib haum rau cov haujlwm uas yuav tsum tau luam tawm ntawm PCB.Lub luag haujlwm tseem ceeb ntawm stencil yog kom raug tso cai kom raug tus nqi ntawm cov tshuaj pleev xim rau ntawm cov ntaub so ntswg kom qhov sib koom ua ke ntawm cov ntaub qhwv thiab cov khoom sib xyaw ua ke zoo tag nrho ntawm cov khoom siv hluav taws xob sib txuas thiab lub zog txhua yam.

Thaum siv, tso lub PCB hauv qab stencil, Thaum lub

stencil yog ua kom zoo nyob rau sab saum toj ntawm lub rooj tsavxwm, solder paste yog siv rau qhov qhib.

Tom qab ntawd cov tshuaj txhuam hniav tau xau mus rau PCB nto los ntawm qhov me me ntawm qhov chaw ruaj khov ntawm stencil.Thaum cov ntawv hlau raug cais tawm ntawm lub rooj tsavxwm, cov tshuaj txhuam hniav yuav nyob twj ywm rau saum npoo ntawm lub rooj tsavxwm, npaj rau kev tso chaw ntawm cov khoom siv saum npoo av (SMDs).Qhov tsawg solder paste yog thaiv ntawm stencil, qhov ntau nws tso rau ntawm PCB.Cov txheej txheem no tuaj yeem rov ua kom raug, yog li nws ua rau cov txheej txheem SMT sai dua thiab sib xws thiab xyuas kom muaj txiaj ntsig zoo ntawm PCB Assembly.

PCB Stencil yog dab tsi?

SMT stencil feem ntau yog ua los ntawm stencil ncej, mesh thiab

stainless-steel daim ntawv, thiab kua nplaum.Feem ntau siv cov stencil thav duab yog cov thav duab lo rau cov hlau mesh nrog cov kua nplaum, uas yog ib qho yooj yim kom tau txais cov ntawv hlau tsis sib xws, uas feem ntau yog 35 ~ 48N / cm2.Mesh yog siv los kho cov ntawv hlau thiab ncej.Muaj ob hom meshes, stainless hlau xaim mesh thiab polymer polyester mesh.Cov qub tuaj yeem muab kev ruaj khov thiab txaus nro tab sis yooj yim rau deform thiab hnav tawm.Tom qab ntawd txawm li cas los xij tuaj yeem nyob ntev piv rau stainless hlau xaim mesh.Feem ntau txais yuav daim ntawv stencil yog 301 lossis 304 stainless hlau daim ntawv uas pom tseeb txhim kho kev ua haujlwm ntawm stencil los ntawm nws cov khoom zoo heev.

Kev tsim cov txheej txheem ntawm Stencil

Muaj xya hom stencils thiab peb txoj kev tsim stencils: tshuaj etching, laser txiav thiab electroforming.Feem ntau siv yog laser hlau stencil.Las

er stencil yog feem ntau siv hauv SMT kev lag luam, uas yog tus cwj pwm yog:

Cov ntaub ntawv cov ntaub ntawv ncaj qha siv los txo qhov kev tsim khoom yuam kev;

Txoj haujlwm qhib qhov tseeb ntawm SMT stencil yog qhov siab heev: tag nrho cov txheej txheem yuam kev yog ≤ ± 4 μ m;

Qhov qhib ntawm SMT stencil muaj geometry, uas yog conduci

ve rau kev luam ntawv thiab molding ntawm solder paste.

Laser txiav cov txheej txheem ntws: zaj duab xis ua PCB, noj kev tswj hwm, cov ntaub ntawv cov ntaub ntawv, cov ntaub ntawv ua, laser txiav, sib tsoo.Cov txheej txheem yog nrog cov ntaub ntawv ntau lawm raug thiab me ntsis cuam tshuam ntawm lub hom phiaj yam tseem ceeb;Trapezoidal qhib yog haum rau demoulding, nws yuav siv tau rau precision txiav, nqi pheej yig.

Cov kev cai dav dav thiab cov qauv ntawm PCB Stencil

1. Yuav kom tau txais ib daim ntawv zoo meej ntawm cov tshuaj pleev xim rau ntawm PCB pads, txoj haujlwm tshwj xeeb thiab cov lus qhia tshwj xeeb yuav tsum ua kom muaj qhov tseeb qhib siab, thiab qhov qhib yuav tsum nruj raws li cov txheej txheem qhib tau xa mus rau cov cim fiducial.

2. Txhawm rau kom tsis txhob muaj qhov tsis xws luag xws li bridging thiab cov hlaws hlaws, qhov qhib sab nraud yuav tsum tsim me me dua li PCB ncoo loj.tag nrho qhov dav yuav tsum tsis pub tshaj 2 hli.Qhov chaw ntawm PCB ncoo yuav tsum nco ntsoov ntau dua li ob feem peb ntawm thaj tsam ntawm sab hauv ntawm phab ntsa aperture ntawm stencil.

3. Thaum ncav lub mesh, nruj me ntsis tswj nws, thiab pa

y tshwj xeeb mloog rau qhov qhib ntau yam, uas yuav tsum yog kab rov tav thiab nruab nrab.

4. Nrog rau qhov chaw luam ntawv raws li sab saum toj, qhov qis qhib ntawm lub mesh yuav tsum yog 0.01mm lossis 0.02mm wider tshaj qhov qhib sab sauv, uas yog, qhov qhib yuav tsum inverted conical los pab txhawb kev tso tawm zoo ntawm cov tshuaj txhuam thiab txo cov kev tu. lub sijhawm ntawm stencil.

5. Cov phab ntsa mesh yuav tsum du.Tshwj xeeb tshaj yog rau QFP thiab CSP nrog qhov sib nrug tsawg dua 0.5 hli, tus neeg muag khoom yuav tsum tau ua electropolishing thaum lub sijhawm tsim khoom.

6. Feem ntau, stencil qhib specification thiab cov duab ntawm SMT Cheebtsam yog raws li lub ncoo, thiab qhov qhib piv yog 1: 1.

7. Qhov tseeb thickness ntawm daim ntawv stencil kom ntseeg tau qhov kev tso tawm

ntawm qhov xav tau tus nqi ntawm solder paste los ntawm qhov qhib.Ntxiv solder deposition tuaj yeem ua rau solder bridging thaum tsawg solder deposition yuav ua rau cov pob qij txha tsis muaj zog.

Yuav tsim PCB Stencil li cas?

1. 0805 pob yog pom zoo kom txiav ob lub ncoo ntawm qhov qhib los ntawm 1.0mm, thiab tom qab ntawd ua rau lub voj voog concave B = 2 / 5Y;A = 0.25mm los yog a = 2 / 5 * l anti tin hlaws.

2. Chip 1206 thiab saum toj no: tom qab ob lub ncoo tau txav mus rau sab nraud los ntawm 0.1mm feem, ua rau lub voj voog sab hauv concave B = 2 / 5Y;A = 2 / 5 * l anti tin hlaws kho.

3. Rau PCB nrog BGA, qhov qhib piv ntawm stencil nrog pob qhov sib nrug ntawm ntau tshaj 1.0mm yog 1: 1, thiab qhov qhib piv ntawm stencil nrog pob qhov sib nrug tsawg dua 0.5 hli yog 1: 0.95.

4. Rau tag nrho QFP thiab SOP nrog 0.5mm suab, qhib rati

o nyob rau hauv tag nrho cov kev taw qhia dav yog 1:0.8.

5. Qhov sib piv ntawm qhov qhib qhov ntev yog 1: 1.1, nrog 0.4mm pitch QFP, qhov qhib nyob rau hauv tag nrho qhov dav kev taw qhia yog 1: 0.8, qhov qhib nyob rau hauv qhov ntev kev taw qhia yog 1: 1.1, thiab sab nrauv rounding ko taw.Chamfer radius r = 0.12 hli.Tag nrho qhib dav ntawm SOP keeb nrog 0.65mm suab yog txo los ntawm 10%.

6. Thaum PLCC32 thiab PLCC44 ntawm cov khoom siv dav dav yog perforated, tag nrho cov kev taw qhia dav yog 1: 1 thiab qhov ntev kev taw qhia yog 1: 1.1.

7. Rau cov khoom siv SOT dav dav, qhov qhib piv

ntawm lub ncoo loj kawg yog 1: 1.1, tag nrho qhov dav kev taw qhia ntawm lub ncoo me me kawg yog 1: 1, thiab qhov ntev yog 1: 1.

Yuav ua li casYuav Siv PCB Stencil?

1. Ua tib zoo saib xyuas.

2. Lub stencil yuav tsum tau ntxuav ua ntej siv.

3. Solder paste los yog kua nplaum liab yuav tsum tau siv sib npaug.

4. Kho lub tshuab luam ntawv siab kom zoo tshaj plaws.

5. Siv lub tshuab luam ntawv pasteboard.

6. Tom qab scraper stroke, nws yog qhov zoo tshaj kom nres rau 2 ~ 3 vib nas this ua ntej demoulding, thiab teem lub demoulding ceev tsis dhau ceev.

7. Stencil yuav tsum tau ntxuav nyob rau hauv lub sij hawm, khaws cia zoo tom qab siv.

Stencil Manufacture Service ntawm PCB ShinTech

PCB ShinTech muaj laser stainless hlau stencils tsim cov kev pabcuam.Peb ua stencils nrog thicknesses ntawm 100 μm, 120 μm, 130μm, 150 μm, 180 μm, 200 μm, 250 μm thiab 300 μm.Cov ntaub ntawv cov ntaub ntawv yuav tsum tau ua rau lub laser stencil yuav tsum muaj SMT solder paste txheej, fiducial cim cov ntaub ntawv, PCB txheej txheej thiab cim txheej, yog li peb tuaj yeem tshawb xyuas sab pem hauv ntej thiab sab nraub qaum ntawm cov ntaub ntawv, pawg pawg, thiab lwm yam.

Yog tias koj xav tau ib qho kev tsocai thov xa koj cov ntaub ntawv thiab nug rausales@pcbshintech.com.