Ntau yam khoom siv raw khoom siv hauv SMT thaj ua haujlwm. Lub tinnote yog qhov tseem ceeb tshaj. Qhov zoo ntawm cov tin paste yuav cuam tshuam ncaj qha rau kev vuam zoo ntawm SMT thaj ua haujlwm. Xaiv ntau hom tinnuts. Cia kuv qhia luv luv txog kev faib cov tin paste:
Weld paste yog ib hom kev sib xyaw ua ke ntawm cov hmoov sib tov nrog cov tshuaj txhuam zoo li cov khoom siv vuam (rosin, diluent, stabilizer, thiab lwm yam) nrog rau kev ua haujlwm welded. Hais txog qhov hnyav, 80 ~ 90% yog hlau alloys. Nyob rau hauv cov nqe lus ntawm ntim, hlau thiab solder accounted rau 50%.
Daim duab 3 Kaum muab tshuaj txhuam granules (SEM) (nce)
Daim duab 4 Daim duab tshwj xeeb ntawm tin hmoov nto npog (down)
Lub solder paste yog tus nqa ntawm tin hmoov hais. Nws muab cov khoom tsim nyog tshaj plaws degeneration thiab av noo los txhawb kev xa hluav taws xob mus rau thaj tsam SMT thiab txo qhov nro ntawm cov kua ntawm lub vuam. Cov khoom xyaw sib txawv qhia cov haujlwm sib txawv:
1. Kev faib tawm raws li cov khoom xyaw ntawm tin paste
1. Cov khoom siv vuam siv lead ua: muaj cov khoom ua haujlwm, uas ua rau muaj kev puas tsuaj rau ib puag ncig thiab tib neeg lub cev, tab sis cov nyhuv vuam yog qhov zoo thiab tus nqi qis. Nws tuaj yeem siv rau qee yam khoom siv hluav taws xob uas tsis muaj kev tiv thaiv ib puag ncig.
2. Lead-free welded paste: Cov khoom siv yog ib puag ncig zoo thiab muaj kev puas tsuaj me me. Nws yog siv nyob rau hauv ib puag ncig tus phooj ywg cov khoom siv hluav taws xob. Nrog rau kev txhim kho cov kev tiv thaiv ib puag ncig rau kev tiv thaiv ib puag ncig, cov cuab yeej siv lead-free hauv SMT kev lag luam yuav dhau los ua ib qho qauv.
2. Kev faib tawm raws li qhov chaw melting ntawm tin paste
Feem ntau hais lus, lub melting point ntawm tin paste tuaj yeem muab faib ua peb hom: kub kub, nruab nrab kub, thiab qis kub.
Feem ntau siv kub yog SN-G-CU 305, 0307; nruab nrab kub muaj SN-BI-AG; Tsis tshua muaj kub uas feem ntau siv SN-BI. Hauv SMT thaj ua haujlwm, koj yuav tsum xaiv raws li cov khoom sib txawv.
3. Muab faib raws li qhov zoo ntawm tin hmoov
Raws li txoj kab uas hla ntawm cov khoom ntawm tin hmoov, tin muab tshuaj txhuam tuaj yeem muab faib ua paj yeeb ntawm 1, 2, 3, 4, 5, thiab 6, uas feem ntau siv 3, 4, thiab 5. Cov khoom lag luam meej dua, tin hmoov yuav tsum me dua, tab sis qhov me me ntawm cov tin hmoov, sib haum rau thaj tsam oxidation ntawm tin hmoov yuav nce. Tsis tas li ntawd, round tin hmoov yuav pab txhim kho kev luam ntawv zoo.
No. 3 Ntxuam: Tus nqi kuj pheej yig, feem ntau siv hauv cov txheej txheem SMT loj;
No. 4 Ntxuam: Feem ntau siv hauv kev ua haujlwm nruj taw IC thiab SMT chips;
Ntxuam 5: Nws yog feem ntau siv rau cov khoom siv vuam zoo heev, cov xov tooj ntawm tes, ntsiav tshuaj, thiab lwm yam, thiab cov kev xav tau siab rau siab-requirements; qhov nyuaj dua yog ua cov khoom ntawm SMT thaj, qhov tseem ceeb tshaj qhov kev xaiv ntawm sacotic paste. Pab txhim kho cov txheej txheem ntawm SMT thaj ua haujlwm.
Post lub sij hawm: Jun-21-2023
