SMT yog ib qho tseem ceeb ntawm cov khoom siv hluav taws xob, hu ua cov txheej txheem sib dhos sab nraud, muab faib ua tsis muaj tus pin lossis luv luv txhuas, yog los ntawm cov txheej txheem ntawm reflow soldering los yog dip soldering rau vuam sib dhos ntawm cov txheej txheem sib dhos, tseem yog tam sim no nrov tshaj plaws nyob rau hauv lub electronic assembly kev lag luam ib tug txheej txheem.Los ntawm cov txheej txheem ntawm SMT thev naus laus zis txhawm rau txhim kho cov khoom me me thiab sib dua, kom lub rooj tsav xwm hauv Circuit Court kom ua tiav qhov siab perimeter, qhov xav tau miniaturization, uas kuj yog nyob rau ntawm SMT kev ua haujlwm kev thov siab dua.
I. SMT ua solder paste yuav tsum tau them sai sai rau
1. Qhov ntsuas kub tsis tu ncua: pib hauv lub tub yees cia kub ntawm 5 ℃ -10 ℃, thov tsis txhob mus qis dua 0 ℃.
2. Tawm ntawm qhov chaw cia: yuav tsum ua raws li cov lus qhia ntawm thawj tiam ua ntej tawm, tsis txhob tsim cov tshuaj pleev xim rau hauv lub freezer cia lub sij hawm ntev heev.
3. Ua kom khov: khov cov nplaum nplaum rau yam tsawg kawg 4 teev tom qab tshem tawm ntawm lub freezer, tsis txhob kaw lub hau thaum khov.
4. Qhov xwm txheej: Lub rooj cob qhia kub yog 25 ± 2 ℃ thiab cov txheeb ze av noo yog 45% -65% RH.
5. Siv cov tshuaj txhuam qub qub: Tom qab qhib lub hau ntawm cov khoom siv tshuaj pleev xim rau hauv 12 teev kom siv tau, yog tias koj xav tau khaws cia, thov siv lub raj mis huv huv los sau, thiab muab ntim rov qab rau hauv lub freezer kom khaws cia.
6. ntawm tus nqi ntawm paste rau ntawm stencil: thawj zaug ntawm tus nqi ntawm solder muab tshuaj txhuam rau ntawm stencil, thiaj li yuav luam cov kev sib hloov tsis txhob hla lub scraper qhov siab ntawm 1/2 raws li zoo, ua tib zoo tshuaj xyuas, mob siab ntxiv ntawm sij hawm ntxiv kom tsawg.
II.SMT nti ua haujlwm luam ntawv yuav tsum tau them sai sai
1. scraper: cov khoom siv scraper yog qhov zoo tshaj plaws los txais yuav steel scraper, ua rau kev luam ntawv ntawm PAD solder paste molding thiab stripping zaj duab xis.
Scraper lub kaum sab xis: phau ntawv luam ntawv rau 45-60 degrees;mechanical printing rau 60 degrees.
Printing ceev: phau ntawv 30-45mm / min;mechanical 40mm-80mm / min.
Kev luam ntawv: kub ntawm 23 ± 3 ℃, txheeb ze av noo 45% -65% RH.
2. Stencil: Lub stencil qhib yog nyob ntawm qhov tuab ntawm stencil thiab cov duab thiab feem ntau ntawm qhov qhib raws li qhov kev thov ntawm cov khoom.
3. QFP / CHIP: qhov nruab nrab qhov sib nrug tsawg dua 0.5mm thiab 0402 CHIP yuav tsum tau qhib nrog laser.
Test stencil: kom tsis txhob stencil tension test ib zaug ib lub lim tiam, tus nqi nro yog thov kom siab tshaj 35N / cm.
Ntxuav cov stencil: Thaum luam ntawv 5-10 PCBs tsis tu ncua, so cov stencil ib zaug nrog cov ntaub ntawv tsis muaj plua plav.Tsis muaj rags yuav tsum tau siv.
4. Tus neeg saib xyuas tu: IPA
Cov kuab tshuaj: Txoj hauv kev zoo tshaj plaws los ntxuav cov stencil yog siv IPA thiab cov kuab tshuaj cawv, tsis txhob siv cov kuab tshuaj uas muaj cov tshuaj chlorine, vim tias nws yuav ua rau cov khoom sib xyaw ntawm cov tshuaj txhuam hniav puas thiab cuam tshuam rau qhov zoo.
Post lub sij hawm: Jul-05-2023