SMT reflow qhov cubyog ib qho khoom siv tseem ceeb hauv cov txheej txheem SMT, uas yog qhov sib xyaw ua ke ntawm lub qhov cub ci.Nws lub luag haujlwm tseem ceeb yog cia cov paste solder nyob rau hauv qhov cub reflow, lub solder yuav yaj ntawm qhov kub thiab txias tom qab lub solder tuaj yeem ua rau SMD Cheebtsam thiab Circuit Court boards ua ke hauv cov khoom siv vuam.Yog tsis muaj SMT reflow soldering cov txheej txheem SMT tsis tuaj yeem ua kom tiav kom cov khoom siv hluav taws xob thiab hluav taws xob hluav taws xob ua haujlwm.Thiab SMT hla lub qhov cub phaj yog qhov tseem ceeb tshaj plaws thaum cov khoom hla lub reflow soldering, saib ntawm no koj yuav muaj qee cov lus nug: SMT hla lub qhov cub phaj yog dab tsi?Lub hom phiaj ntawm kev siv SMT overbake tais lossis overbake carriers yog dab tsi?Ntawm no yog saib dab tsi SMT overbake tais tiag tiag.
1. Dab tsi yog SMT overbake tais?
Lub npe hu ua SMT over-burner tray lossis over-burner carrier, qhov tseeb, yog siv los tuav lub PCB thiab tom qab ntawd coj mus rau sab nraub qaum rau lub lauj kaub tais diav lossis cov nqa khoom.Tray cab kuj feem ntau muaj ib tug positioning kem siv los kho lub PCB los tiv thaiv nws los ntawm khiav los yog deformation, ib co ntawm lub siab tshaj lub tais carrier kuj yuav ntxiv ib lub hau, feem ntau yog rau FPC, thiab nruab cov hlau nplaum rau, download lub cuab tam thaum lub suction khob fastening nrog, yog li SMT nti ua cov nroj tsuag tuaj yeem zam PCB deformation.
2. Kev siv SMT hla lub qhov cub lossis tshaj lub hom phiaj ntawm lub qhov cub nqa khoom
SMT ntau lawm thaum siv lub qhov cub lub tais yog txo qis PCB deformation thiab tiv thaiv qhov hnyav hnyav poob, ob qho tib si muaj feem xyuam rau SMT rov qab mus rau qhov kub ntawm qhov cub, rau feem ntau ntawm cov khoom tam sim no siv cov txheej txheem tsis muaj hmoov txhuas. SAC305 solder paste molten tin kub ntawm 217 ℃, thiab SAC0307 solder paste molten tin kub poob txog 217 ℃ ~ 225 ℃, qhov kub siab tshaj plaws rov qab rau lub solder feem ntau pom zoo nyob rau hauv nruab nrab ntawm 240 ~ 250 ℃, tab sis rau cov nqi txiav txim siab. , peb feem ntau xaiv FR4 phaj rau Tg150 saum toj no.Qhov ntawd yog hais tias, thaum PCB nkag mus rau qhov kub ntawm qhov kub ntawm qhov cub, qhov tseeb, nws tau ntev tshaj nws cov iav hloov mus rau hauv lub xeev roj hmab, lub xeev roj hmab ntawm PCB yuav deformed tsuas yog qhia nws cov khoom siv xwb. txoj cai.
Coupled nrog lub thinning ntawm lub rooj tsavxwm thickness, los ntawm lub dav dav thickness ntawm 1.6 hli mus rau 0.8 hli, thiab txawm 0.4 hli PCB, xws li ib tug nyias Circuit Court board nyob rau hauv kev cai raus dej ntawm kub kub tom qab soldering rauv, nws yog yooj yim dua vim hais tias ntawm lub siab. kub thiab lub rooj tsavxwm deformation teeb meem.
SMT hla lub qhov cub lossis dhau lub qhov cub nqa khoom yog txhawm rau kov yeej PCB deformation thiab qhov chaw poob teeb meem thiab tshwm sim, nws feem ntau siv tus ncej los txhim kho PCB qhov chaw, nyob rau hauv lub phaj kub deformation kom muaj txiaj ntsig zoo ntawm PCB. kom txo tau lub phaj deformation, tau kawg, kuj yuav tsum muaj lwm yam tuav los pab rau nruab nrab txoj hauj lwm ntawm lub phaj vim tias qhov cuam tshuam ntawm lub ntiajteb txawj nqus yuav khoov qhov teeb meem ntawm lub tog.
Tsis tas li ntawd, koj tuaj yeem siv cov khoom thauj khoom hnyav dhau los tsis yooj yim rau deform cov yam ntxwv ntawm kev tsim cov tav lossis cov ntsiab lus txhawb nqa hauv qab ntawm cov khoom hnyav los xyuas kom meej tias cov khoom tsis poob ntawm qhov teeb meem, tab sis tus tsim ntawm cov cab kuj yuav tsum yog heev. ceev faj kom tsis txhob muaj cov ntsiab lus txhawb nqa ntau dhau los nqa cov khoom uas tshwm sim los ntawm ob sab ntawm qhov tsis raug ntawm qhov teeb meem ntawm solder paste luam ntawv tshwm sim.
Post lub sij hawm: Apr-06-2022