Yuav ua li cas siv ham muab tshuaj nyob rau hauv PCBA cov txheej txheem?
(1) Txoj kev yooj yim rau kev txiav txim qhov viscosity ntawm ham muab tshuaj: do tus muab tshuaj nrog tus spatula li 2-5 feeb, khaws me me ham muab tshuaj nrog tus spatula, thiab cia cov ham muab tshuaj poob qis. Lub viscosity muaj ntsis; yog cov ham muab tshuaj tsis plam txhua, viscosity ntawm ham muab tshuaj yog dhau; yog cov ham muab tshuaj txhuam kom plam tawm sai sai, lub viscosity ntawm ham muab tshuaj yog tsawg heev;
(2) Cov kev mob cia ntawm ham muab tshuaj: tso rau hauv daim ntawv kaw ntawm qhov kub ntawm 0 ° C txog 10 ° C, thiab lub sijhawm cia feem ntau yog 3 txog 6 hli;
(3) Tom qab cov quav muab tshuaj txhuam tawm ntawm lub tub yees, nws yuav tsum muab ua kom sov ntawm chav sov rau ntau tshaj 4 teev ua ntej nws yuav siv tau. Cov txheej txheem cua kub tsis tuaj yeem siv rov qab mus rau qhov kub thiab txias; tom qab uas cov muab tshuaj txhuam tau sov tas, nws yuav tsum tau do (xws li sib xyaw nrog lub tshuab, nplawm 1-2 feeb, nplawm ntawm tes yuav tsum tau muab do ntev tshaj 2 feeb) ua ntej siv;
(4) Qhov kub thiab txias rau cov muab tshuaj txhuam cov ntawv luam yuav tsum yog 22 ～ ～ 28 ℃, thiab cov av noo yuav tsum qis dua 65%;
(5) Neeg siv tshuab luam ntawv luam ntawv
1. Thaum luam ntawv ham muab tshuaj, nws raug nquahu kom siv cov tshuaj txhuam cov cam nrog cov ntsiab lus hlau ntawm 85% rau 92% thiab lub neej ua haujlwm ntev dua 4 teev;
2. Lub tshuab luam ntawv nrawm thaum luam ntawv, khiav ceev ntawm lub suab paj taub ntawm cov ntawv luam tawm yog qhov tseem ceeb heev, vim tias cov tshuaj txhuam cov ntawv xav tau lub sijhawm yob thiab ntws mus rau hauv lub qhov taub tuag. Cov nyhuv yog qhov zoo dua thaum muab tshuaj txhuam yob yob tusyees ntawm stencil.
3. Lub tshuab luam ntawv luam ntawv siab yuav tsum tau ua kom sib haum nrog cov tawv tawv ntawm cov pa. Yog tias lub siab ntsuas qis dhau, rubeegee yuav tsis ntxuav cov tshuaj pleev xim rau ntawm daim qauv. Yog hais tias qhov ntsuas loj dhau lossis lub squeegee yuav mos dhau, cov ntaub qhwv yuav poob rau daim qauv. Khawb tawm cov quav pleev tawm ntawm lub qhov loj. Cov khoom xyaw siab rau lub zog siab: Siv lub scraper ntawm lub qauv hlau. Txhawm rau kom tau txais qhov tseeb siab, pib los ntawm kev thov 1 kg ntawm siab rau txhua 50 hli ntawm qhov ntev ntev ntawm scraper. Piv txwv li, 300 mm scraper siv lub siab ntawm 6 kg kom maj mam txo qhov siab. Txog thaum uas tus muab tshuaj txhuam pib ua kom nyob twj ywm rau ntawm tus qauv thiab tsis raug khawb kom huv si, tom qab ntawd maj mam ua kom lub siab kom txog thaum uas tus muab tshuaj txhuam tsuas yog txhuam kom tawm. Lub sijhawm no, lub siab yog qhov zoo tshaj.
4. Cov txheej txheem tswj kev tswj hwm thiab cov txheej txheem cov txheej txheem Nyob rau hauv kev ua tiav kom ua tiav cov luam ntawv zoo, nws yog qhov tsim nyog kom muaj cov khoom muaj cov khoom ua kom zoo muag (viscosity, cov ntsiab lus hlau, qhov hmoov loj tshaj plaws thiab qis tshaj flux kev ua si), cov cuab yeej tseeb (tshuab luam ntawv, template thiab Kev sib xyaw ntawm cov scraper) thiab cov txheej txheem raug (chaw zoo, ntxuav thiab so). Raws li cov khoom sib txawv, teeb tsa cov txheej txheem luam tawm cov txheej txheem nyob rau hauv lub tshuab luam ntawv, xws li ua haujlwm kub, ua haujlwm siab, rubeegee ceev, nrawm nrawm, tsis siv neeg lub cav ntxuav lub voj voog, thiab lwm yam thaum tib lub sijhawm, nws tsim nyog los tsim cov txheej txheem nruj kev tswj hwm kev tswj hwm thiab cov txheej txheem cov txheej txheem.
Siv cov tshuaj txhuam cov quav tsis pub dhau lub sijhawm siv tau nruj me ntsis raws li cov qauv tsim. Cov tshuaj ham yuav tsum tso rau hauv lub tub yees rau hnub ua hauj lwm. Nws yuav tsum muab tso rau ntawm chav tsev kub tshaj 4 teev ua ntej siv, thiab tom qab ntawd lub hau yuav qhib rau kev siv. Cov siv lo lo ntxuam yuav tsum kaw thiab muab pov tseg nyias. Seb qhov zoo yog tsim nyog.
Ua ntej ua ntau lawm, tus neeg teb xov tooj siv tshwj xeeb stainless hlau nias riam los nplawm cov ham muab tshuaj txhuam kom nws txawm.
③ Tom qab cov luam ntawv tshuaj xyuas thawj los yog cov khoom siv hloov kho ntawm lub luag haujlwm, cov tshuaj txhuam cov thickness tester yuav tsum tau siv los ntsuas qhov luam ntawv tuab ntawm cov ntawv nplaum ham. Cov ntawv xeem raug xaiv ntawm 5 cov qhab nia ntawm cov ntawv sib tw ntawm cov ntawv luam tawm, suav nrog cov sab saud thiab qis dua, sab laug thiab sab xis thiab nruab nrab, thiab sau cov nqi. Lub thickness ntawm cov ham muab tshuaj txhuam li ntawm -10% mus rau +15% ntawm cov thickness tuab.
Thaum lub sij hawm ua ntau lawm, 100% tshuaj ntsuam xyuas yog ua tiav ntawm kev luam ntawv zoo ntawm ham muab tshuaj. Cov ntsiab lus tseem ceeb yog seb cov qauv siv ham ua tiav, seb cov tuab puas zoo ib yam, thiab seb puas muaj ham muab tshuaj txhuam dua.
⑤ Ntxuav cov qauv no raws li cov txheej txheem kev xav tau tom qab ua haujlwm ntawm kev ua haujlwm tiav.
⑥ Tom qab qhov kev sim luam ntawv lossis luam ntawv tsis ua tiav, qhov muab tshuaj txhuam ntawm lub rooj tsav xwm yuav tsum tau muab huv nrog cov khoom siv ultrasonic ntxuav thiab ziab, lossis ntxuav nrog cawv thiab roj siab kom tiv thaiv cov ham ua rau ntawm lub rooj tsavxwm los ntawm qhov tshwm sim thaum nws siv dua. Cov khoom tawg thiab lwm yam tshwm sim tom qab reflow soldering
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