Solder paste tshuab luam ntawv yog ib qho khoom siv tseem ceeb nyob rau sab pem hauv ntej ntawm SMT kab, feem ntau yog siv cov stencil los luam cov ntaub nplaum rau ntawm cov ntaub ntawv teev tseg, qhov zoo los yog phem solder paste printing, ncaj qha cuam tshuam rau qhov kawg solder zoo.Cov hauv qab no los piav qhia txog kev paub txog kev siv tshuab luam ntawv txheej txheem kev teeb tsa.
1. Squeegee siab.
Lub squeegee siab yuav tsum yog raws li cov khoom tsim tawm tiag tiag.Lub siab me me dhau lawm, tej zaum yuav muaj ob qhov xwm txheej: squeegee nyob rau hauv cov txheej txheem ntawm kev nce mus rau downward quab yuam kuj yog me me, yuav ua rau cov to ntawm tus nqi ntawm cov luam ntawv tsis txaus;Thib ob, lub squeegee tsis nyob ze rau saum npoo ntawm stencil, luam ntawv vim muaj qhov sib txawv me me ntawm cov squeegee thiab PCB, ua kom cov luam ntawv tuab.Tsis tas li ntawd, lub squeegee siab me me dhau lawm yuav ua rau cov stencil nto tawm ib txheej ntawm solder paste, yooj yim ua rau cov duab nplaum thiab lwm yam tsis xws luag.Ntawm qhov tsis sib xws, qhov squeegee siab loj heev yuav yooj yim ua rau solder paste luam ntawv yog nyias, thiab txawm ua rau cov stencil puas.
2. Scraper lub kaum sab xis.
Scraper lub kaum feem ntau yog 45 ° ~ 60 °, solder muab tshuaj txhuam nrog zoo dov.Qhov luaj li cas ntawm lub kaum sab xis ntawm lub scraper cuam tshuam qhov loj ntawm lub ntsug quab yuam ntawm lub scraper ntawm solder paste, lub kaum sab xis me dua, lub zog ntsug ntau dua.Los ntawm kev hloov lub kaum sab xis ntawm scraper tuaj yeem hloov lub siab tsim los ntawm scraper.
3. Squeegee hardness
Lub hardness ntawm lub squeegee tseem yuav cuam tshuam rau lub thickness ntawm cov luam ntawv solder paste.Cov squeegee mos dhau lawm yuav ua rau lub dab ntxuav muag, yog li yuav tsum siv lub zog squeegee lossis hlau squeegee, feem ntau siv stainless hlau squeegee.
4. Printing ceev
Kev luam ntawv ceev feem ntau yog teem rau 15 ~ 100 mm / s.Yog tias qhov nrawm nrawm dhau lawm, cov tshuaj nplaum nplaum nplaum yog qhov loj, nws tsis yooj yim kom nco cov ntawv luam tawm, thiab cuam tshuam rau kev luam ntawv.Kev nrawm nrawm dhau, lub squeegee los ntawm lub sij hawm qhib lub template yog luv dhau, lub solder paste tsis tuaj yeem nkag mus rau hauv qhov qhib, yooj yim ua rau solder paste tsis yog tag nrho los yog to ntawm qhov tsis xws luag.
5. Kev luam ntawv sib txawv
Kev luam ntawv sib txawv yog hais txog qhov kev ncua deb ntawm qhov chaw hauv qab ntawm stencil thiab PCB nto, stencil luam ntawv tuaj yeem muab faib ua kev sib cuag thiab tsis sib cuag luam ntawv ob hom.Stencil luam ntawv nrog qhov sib txawv ntawm PCB yog hu ua non-contact printing, qhov dav dav ntawm 0 ~ 1.27mm, tsis muaj qhov sib txawv ntawm kev luam ntawv yog hu ua hu rau luam ntawv.Hu rau kev luam ntawv stencil ntsug sib cais tuaj yeem ua rau kev luam ntawv zoo cuam tshuam los ntawm Z me me, tshwj xeeb tshaj yog rau cov suab paj nruag zoo rau luam ntawv.Yog tias qhov stencil thickness tsim nyog, kev sib cuag luam ntawv feem ntau yog siv.
6. Tso tawm ceev
Thaum lub squeegee ua tiav lub tshuab luam ntawv, qhov nrawm nrawm ntawm stencil tawm hauv PCB yog hu ua demoulding ceev.Kev hloov kho kom raug ntawm qhov kev tso tawm nrawm, kom cov stencil tawm ntawm PCB thaum muaj cov txheej txheem nyob luv luv, yog li ntawd cov khoom siv los ntawm cov stencil qhib tau tso tawm tag nrho (demolded), thiaj li yuav tau txais Z zoo tshaj plaws solder paste graphics.Kev sib cais ceev ntawm PCB thiab stencil yuav muaj kev cuam tshuam ntau dua rau kev luam ntawv.Lub sij hawm demoulding ntev dhau lawm, yooj yim rau hauv qab ntawm stencil residual solder paste;Lub sij hawm demoulding yog luv heev, tsis conducive rau upright solder paste, cuam tshuam nws clarity.
7. Stencil tu zaus
Kev ntxuav stencil yog ib qho tseem ceeb los xyuas kom meej qhov zoo ntawm kev luam ntawv, ntxuav hauv qab ntawm stencil hauv txheej txheem luam ntawv kom tshem tawm cov av hauv qab, uas yuav pab tiv thaiv PCB paug.Kev ntxuav yog feem ntau ua nrog anhydrous ethanol ua cov tshuaj ntxuav.Yog tias muaj cov khoom seem seem nyob rau hauv qhov qhib ntawm lub stencil ua ntej ntau lawm, nws yuav tsum tau muab ntxuav ua ntej siv, thiab xyuas kom meej tias tsis muaj cov tshuaj ntxuav tu, txwv tsis pub nws yuav cuam tshuam rau kev sib tsoo ntawm cov tshuaj txhuam.Nws yog feem ntau teev tseg tias stencil yuav tsum tau muab ntxuav manually nrog stencil so daim ntawv txhua 30 feeb, thiab cov stencil yuav tsum tau ntxuav nrog ultrasonic thiab cawv tom qab ntau lawm kom paub tseeb tias tsis muaj residual solder paste nyob rau hauv lub stencil qhib.
Post lub sij hawm: Dec-09-2021