Reflowqhov cubtxheej txheem yog coated nrog solder paste, mounted Cheebtsam ntawm PCB, tom qab reflow qhov cub soldering kom tiav cov ziab, preheating, melting, txias thiab solidification ntawm vuam txheej txheem.
I. PCB pad tsim
Yog hais tias tus PCB ncoo tsim yog lawm, ib tug me me ntawm skewed mounting yuav raug kho thaum lub sij hawm reflow soldering vim lub luag hauj lwm ntawm nto nro ntawm molten solder (lub npe hu ua nws tus kheej positioning los yog nws tus kheej-kho nyhuv).
II. Qhov zoo ntawm solder paste
Solder paste yog cov txheej txheem reflow soldering cov ntaub ntawv tsim nyog, nws yog los ntawm cov hmoov txhuas (cov khoom) thiab muab tshuaj txhuam cov cab kuj sib npaug sib xyaw rau hauv cov tshuaj txhuam. Ib qho ntawm cov khoom siv hlau yog cov khoom tseem ceeb ntawm kev tsim cov pob qij txha, flux yog tshem tawm cov oxidized txheej ntawm soldering nto los txhim kho wettability.
III. Qhov zoo thiab kev ua tau zoo ntawm cov khoom
Qhov zoo thiab kev ua tau zoo ntawm cov khoom siv ncaj qha cuam tshuam rau reflow soldering los ntawm tus nqi. Raws li ib qho ntawm cov khoom ntawm reflow soldering, yuav tsum muaj cov ntsiab lus tseem ceeb tshaj plaws yog qhov kub tsis kam. Thiab qee cov khoom siv yuav muaj peev xwm ua kom muaj cua sov loj, qhov vuam kuj muaj qhov cuam tshuam loj, xws li PLCC, QFP ib txwm muaj thiab cov khoom sib cais ntawm cov chips piv rau cov khoom siv hluav taws xob uas muaj peev xwm loj, vuam cov cheeb tsam loj dua cov khoom me me nyuaj dua. .
IV. cov txheej txheem vuam txheej txheem tswj
1. Kev tsim kho qhov kub thiab txias profile
Temperature profile muab txoj hauv kev yooj yim los txheeb xyuas cov khoom hauv tag nrho cov txheej txheem reflow kub hloov. Qhov no yog qhov tseem ceeb heev kom tau txais qhov zoo tshaj plaws weldability, kom tsis txhob muaj kev puas tsuaj rau cov khoom vim qhov kub thiab txias, nrog rau kev ua kom zoo ntawm vuam zoo heev.
2. Pre-heat seem
Lub hom phiaj ntawm cheeb tsam no yog mus rau chav tsev kub PCB kom sai li sai tau kom cua sov mus rau lub hom phiaj thib ob. Tus nqi cua sov yuav tsum tau tswj nyob rau hauv qhov tsim nyog, yog tias ceev heev, yuav ua rau thermal shock, lub rooj tsavxwm thiab cov khoom yuav puas. qeeb dhau, cov kuab tshuaj evaporation tsis txaus, cuam tshuam qhov zoo ntawm soldering. Vim muaj cua sov ceev, qhov sib txawv ntawm qhov kub thiab txias hauv SMA hauv qhov kawg ntawm qhov kub thiab txias yog qhov loj dua. Txhawm rau tiv thaiv kev puas tsuaj rau cov khoom ntawm thermal shock, cov kev cai dav dav ntawm qhov siab tshaj plaws ntawm 4 degree / s. Txawm li cas los xij, tus nqi nce li ib txwm yog teem rau 1-3 degree / s. Tus nqi cua sov ntawm 2 degree / s.
3. Rwb thaiv tsev seem
Tuav ntu yog hais txog qhov kub ntawm 120 degree -150 degree nce mus rau qhov melting point ntawm thaj chaw solder paste. Nws lub hom phiaj tseem ceeb yog txhawm rau tswj qhov kub thiab txias ntawm cov khoom hauv SMA kom txo qhov kub ntawm qhov sib txawv. Lub sij hawm txaus nyob rau hauv cheeb tsam no kom qhov kub thiab txias ntawm cov khoom loj kom ntes tau nrog cov khoom me me, thiab xyuas kom meej tias cov flux nyob rau hauv lub solder paste yog tag nrho evaporated. Txog rau qhov kawg ntawm cov rwb thaiv tsev, cov ntaub qhwv, cov khoom siv thiab cov khoom sib txuas ntawm cov oxide raug tshem tawm, qhov kub ntawm tag nrho cov khoom siv hluav taws xob kom ncav cuag qhov sib npaug.
4. Reflow seem
Nyob rau hauv cov cheeb tsam no lub rhaub kub yog teem rau lub siab tshaj plaws kub, thiaj li hais tias qhov kub ntawm cov tivthaiv sai sai mus rau lub ncov kub. Nyob rau hauv lub reflow seem ntawm lub ncov kub ntawm lub soldering nyob ntawm qhov sib txawv solder paste siv, feem ntau pom zoo rau lub melting point ntawm solder paste kub ntxiv rau 20-40 degree . Rau qhov melting point ntawm 183 degree C 63Sn / 37Pb solder paste thiab melting point ntawm 179 degree C Sn62 / Pb36 / Ag2 solder paste, lub ncov kub feem ntau yog 210-230 degree C, reflow lub sij hawm yuav tsum tsis txhob ntev dhau lawm, txiav txim kom tsis txhob muaj kev phiv los ntawm SMA. Qhov zoo tshaj plaws kub qhov profile yog ntau tshaj qhov melting point ntawm solder "tiab cheeb tsam" npog qhov tsawg tshaj plaws cheeb tsam.
5. Qhov cua txias
Nyob rau hauv seem no ntawm lub solder paste nyob rau hauv cov hmoov txhuas thiab tin hmoov tau melted thiab tag nrho wetted nto yuav tsum tau kev cob cog rua, yuav tsum tau siv kom sai li sai tau kom txias, uas yuav pab tau kom tau ib tug kaj lug solder pob qij txha thiab muaj ib tug zoo zoo thiab tsawg. contact lub kaum sab xis. Kev ua kom txias qeeb yuav ua rau muaj kev puas tsuaj ntau ntawm lub rooj tsavxwm rau hauv cov tin, uas ua rau grey, ntxhib solder sib koom ua ke. Hauv qhov xwm txheej hnyav, nws tuaj yeem ua rau tsis zoo soldering thiab ua rau cov nyiaj tsis muaj zog.
Nta ntawmNeoDen IN12C Reflow Cub
1. Ua-nyob rau hauv vuam fume filtration system, zoo filtration ntawm teeb meem gases, zoo nkauj tsos thiab ib puag ncig tiv thaiv, ntau nyob rau hauv txoj kab nrog kev siv high-end ib puag ncig.
2. Cov kev tswj xyuas muaj cov yam ntxwv ntawm kev sib koom ua ke siab, cov lus teb raws sij hawm, tsis tshua muaj nqi, kev saib xyuas yooj yim, thiab lwm yam.
3. Kev tsim hluav taws xob tiv thaiv hluav taws xob, lub plhaub kub tuaj yeem tswj tau zoo.
4. Kev tswj kev txawj ntse, siab kub siab sensor, zoo kub stabilization.
5. Kev txawj ntse, kev koom ua ke nrog PID tswj algorithm ntawm kev cai-tsim ntse tswj system, siv tau yooj yim, muaj zog.
6. kev tshaj lij, tshwj xeeb 4-txoj kev board deg qhov ntsuas kub ntsuas qhov system, kom qhov kev ua haujlwm tiag tiag hauv cov ntaub ntawv tawm tswv yim raws sij hawm thiab cov lus qhia dav dav, txawm tias cov khoom siv hluav taws xob nyuaj tuaj yeem ua tau zoo.
7. tuaj yeem khaws 40 cov ntaub ntawv ua haujlwm.
8. Mus txog rau 4-txoj kev real-time zaub ntawm PCB board nto vuam kub nkhaus.