(1) Txoj Cai ntawmreflow soldering
Vim tias qhov txuas txuas txuas ntxiv ntawm cov khoom siv hluav taws xob PCB boards, cov khoom siv chips tau tshwm sim, thiab cov txheej txheem vuam tsoos tsis tuaj yeem ua tau raws li qhov xav tau.Reflow soldering yog siv nyob rau hauv kev sib dhos ntawm hybrid integrated circuit boards, thiab feem ntau ntawm cov khoom sib dhos thiab welded yog nti capacitors, nti inductors, mounted transistors thiab diodes.Nrog rau kev txhim kho tag nrho SMT thev naus laus zis tau dhau los ua qhov zoo tshaj plaws, qhov tshwm sim ntawm ntau yam chip Cheebtsam (SMC) thiab mounting devices (SMD), reflow soldering txheej txheem thev naus laus zis thiab cov cuab yeej siv los ua ib feem ntawm cov tshuab mounting kuj tau tsim raws li. , thiab lawv cov ntawv thov tau dhau los ua ntau thiab ntau dua.Nws tau siv nyob rau hauv yuav luag tag nrho cov khoom siv hluav taws xob.Reflow soldering yog ib qho muag muag uas paub txog kev sib txuas ntawm cov tshuab thiab hluav taws xob ntawm qhov kawg ntawm cov khoom siv los yog cov pins thiab cov ntaub ntawv luam tawm los ntawm remelting lub paste-loaded solder uas tau muab faib ua ntej ntawm cov ntawv luam tawm.vuam.Reflow soldering yog rau solder Cheebtsam rau lub rooj tsavxwm PCB, thiab reflow soldering yog rau mount cov cuab yeej rau saum npoo.Reflow soldering cia siab rau qhov kev txiav txim ntawm cov cua kub ntws ntawm cov pob qij txha, thiab cov jelly-zoo li flux ua rau lub cev cov tshuaj tiv thaiv nyob rau hauv ib tug tej yam kub cua ntws mus cuag SMD soldering;yog li nws yog hu ua "reflow soldering" vim hais tias cov roj circulates nyob rau hauv lub vuam tshuab los ua kom kub kub kom ua tiav lub hom phiaj ntawm soldering..
(2) Lub hauv paus ntsiab lus ntawmreflow solderingtshuab tau muab faib ua ntau yam lus piav qhia:
A. Thaum PCB nkag mus rau thaj tsam cua sov, cov kuab tshuaj thiab cov pa roj hauv cov tshuaj muab tshuaj evaporate.Nyob rau tib lub sij hawm, cov flux nyob rau hauv lub solder paste ntub cov ntaub qhwv, tivthaiv terminals thiab pins, thiab solder paste softens, collapses, thiab npog lub solder paste.phaj rau cais cov ntaub qhwv thiab cov khoom sib txuas ntawm cov pa oxygen.
B. Thaum lub PCB nkag mus rau hauv qhov chaw txuag hluav taws xob, PCB thiab cov khoom siv tau ua kom tag nrho preheated los tiv thaiv PCB los ntawm dheev nkag mus rau hauv qhov kub thiab txias ntawm vuam thiab ua rau cov PCB thiab cov khoom puas.
C. Thaum lub PCB nkag mus rau hauv qhov chaw vuam, qhov kub thiab txias tau nce sai heev kom cov tshuaj txhuam hniav mus txog lub xeev molten, thiab cov kua nplaum ntub dej, diffuses, diffuses, los yog reflows cov ntaub qhwv, cov khoom xaus thiab cov pins ntawm PCB los tsim cov pob qij txha. .
D. Lub PCB nkag mus rau hauv qhov chaw txias kom khov kho cov pob qij txha;thaum lub reflow soldering tiav.
(3) Cov txheej txheem xav tau raureflow solderingtshuab
Reflow soldering thev naus laus zis tsis yog qhov tsis paub hauv kev tsim hluav taws xob.Cheebtsam ntawm ntau yam boards siv nyob rau hauv peb lub computer yog soldered rau Circuit Court boards los ntawm cov txheej txheem no.Qhov zoo ntawm cov txheej txheem no yog qhov kub thiab txias yog yooj yim los tswj, oxidation yuav zam tau thaum lub sij hawm soldering txheej txheem, thiab cov nqi tsim khoom yog yooj yim los tswj.Muaj cov cua sov hauv cov cuab yeej no, uas ua rau cov roj nitrogen ua kom kub txaus thiab tshuab mus rau lub rooj tsav xwm hauv Circuit Court uas cov khoom tau txuas nrog, kom lub solder ntawm ob sab ntawm cov khoom yog yaj thiab tom qab ntawd txuas rau lub motherboard. .
1. Teem ib qhov tsim nyog reflow soldering kub profile thiab ua real-time kev ntsuas kub profile tsis tu ncua.
2. Weld raws li cov kev taw qhia vuam ntawm PCB tsim.
3. nruj me ntsis tiv thaiv txoj siv conveyor los ntawm vibrating thaum lub vuam txheej txheem.
4. Cov nyhuv vuam ntawm cov ntawv luam tawm yuav tsum tau kuaj xyuas.
5. Txawm hais tias lub vuam yog txaus, seb qhov saum npoo ntawm cov pob qij txha yog du, txawm hais tias cov duab ntawm lub vuam sib txuas yog ib nrab hli, qhov xwm txheej ntawm cov pob thiab cov khoom seem, qhov teeb meem ntawm kev sib txuas txuas ntxiv thiab kev sib txuas virtual.Kuj xyuas PCB nto xim hloov thiab lwm yam.Thiab kho qhov kub thiab txias nkhaus raws li kev soj ntsuam xyuas.Vuam zoo yuav tsum tau kuaj xyuas tsis tu ncua thoob plaws hauv kev tsim khoom.
(4) Cov yam ntxwv cuam tshuam rau cov txheej txheem reflow:
1. Feem ntau PLCC thiab QFP muaj peev xwm ua kom sov ntau dua li cov khoom sib cais, thiab nws yog qhov nyuaj rau vuam cov cheeb tsam loj dua li cov khoom me me.
2. Nyob rau hauv lub qhov cub reflow, txoj siv conveyor kuj dhau los ua ib qho cua sov dissipation system thaum cov khoom conveyed yog reflowed dua.Tsis tas li ntawd, cov cua kub dissipation tej yam kev mob ntawm ntug thiab qhov nruab nrab ntawm lub cua sov qhov chaw yog txawv, thiab qhov kub ntawm lub ntug yog tsawg.Ntxiv rau qhov kev xav tau sib txawv, qhov kub ntawm tib qhov chaw thau khoom kuj txawv.
3. Kev cuam tshuam ntawm kev thauj khoom sib txawv.Kev hloov kho ntawm qhov kub thiab txias profile ntawm reflow soldering yuav tsum tau coj mus rau hauv tus account tias zoo repeatability yuav tsum tau nyob rau hauv tsis muaj-load, load thiab txawv load yam.Tus nqi thauj khoom yog txhais raws li: LF = L / (L + S);qhov twg L = qhov ntev ntawm qhov sib dhos substrate thiab S = qhov sib nrug ntawm cov khoom sib dhos.Qhov siab dua qhov load, qhov nyuaj dua nws yog kom tau txais cov txiaj ntsig rov ua dua tshiab rau cov txheej txheem reflow.Feem ntau qhov siab tshaj plaws ntawm qhov cub reflow yog nyob rau hauv thaj tsam ntawm 0.5 ~ 0.9.Qhov no yog nyob ntawm qhov xwm txheej ntawm cov khoom (cov khoom sib txuas, qhov sib txawv ntawm cov substrates) thiab cov qauv sib txawv ntawm reflow furnaces.Kev ua tau zoo yog qhov tseem ceeb kom tau txais cov txiaj ntsig zoo vuam thiab rov ua dua.
(5) Dab tsi yog qhov zoo ntawmreflow solderingtshuab tshuab?
1) Thaum soldering nrog reflow soldering thev naus laus zis, tsis tas yuav muab tso rau hauv lub rooj tsav xwm luam tawm hauv molten solder, tab sis cov cua sov hauv zos yog siv los ua kom tiav cov hauj lwm soldering;Yog li ntawd, cov khoom yuav tsum tau soldered yuav raug me ntsis thermal shock thiab yuav tsis tshwm sim los ntawm overheating puas rau cov khoom.
2) Txij li thaum vuam tshuab tsuas yog yuav tsum tau siv cov vuam ntawm qhov vuam thiab ua kom sov hauv zos kom ua tiav cov vuam, kev vuam tsis xws li kev sib tsoo yog zam.
3) Nyob rau hauv lub reflow soldering txheej txheem technology, lub solder tsuas yog siv ib zaug xwb, thiab tsis muaj rov qab siv, yog li ntawd lub solder yog huv si thiab tsis muaj impurities, uas ua kom zoo ntawm cov pob qij txha.
(6) Taw qhia rau cov txheej txheem ntws ntawmreflow solderingtshuab
Cov txheej txheem reflow soldering yog ib tug nto mount board, thiab nws cov txheej txheem yog ntau nyuaj, uas yuav muab faib ua ob hom: ib leeg-sided mounting thiab ob-sided mounting.
A, ib sab mounting: pre-txheej solder paste → thaj (siv rau hauv phau ntawv mounting thiab tshuab tsis siv neeg mounting) → reflow soldering → soj ntsuam thiab hluav taws xob kuaj.
B, Ob chav sided mounting: Pre-txheej solder paste rau ntawm A sab → SMT (muab faib rau hauv phau ntawv tso thiab tsis siv neeg tshuab tso) → Reflow soldering → Pre-txheej solder paste rau B sab → SMD (muab faib rau hauv phau ntawv tso thiab tshuab tsis siv neeg tso ) kev tso kawm) → reflow soldering → soj ntsuam thiab kuaj hluav taws xob.
Cov txheej txheem yooj yim ntawm reflow soldering yog "screen printing solder paste - thaj - reflow soldering, lub hauv paus ntawm uas yog qhov tseeb ntawm silk screen printing, thiab tus nqi tawm los yog txiav txim siab los ntawm PPM ntawm lub tshuab rau patch soldering, thiab reflow soldering yog. los tswj qhov kub thiab txias siab.thiab txo qhov kub ntawm qhov nkhaus. "
(7) Reflow soldering tshuab cov cuab yeej kho qhov system
Kev tu haujlwm uas peb yuav tsum tau ua tom qab siv cov reflow soldering;txwv tsis pub, nws yog ib qho nyuaj rau tswj lub neej kev pab cuam ntawm cov khoom siv.
1. Txhua qhov yuav tsum tau kuaj xyuas txhua hnub, thiab kev saib xyuas tshwj xeeb yuav tsum tau them rau txoj siv conveyor, kom nws tsis tuaj yeem daig lossis poob.
2 Thaum kho lub tshuab, lub hwj chim yuav tsum raug muab tua kom tsis txhob muaj hluav taws xob poob lossis luv luv.
3. Lub tshuab yuav tsum ruaj khov thiab tsis qaij lossis tsis ruaj khov
4. Nyob rau hauv cov ntaub ntawv ntawm ib tug neeg qhov kub thiab txias cheeb tsam uas tsis muaj cua sov, thawj zaug xyuas tias cov fuse sib raug yog pre-distributed rau PCB ncoo los ntawm remelting lub paste.
(8) Kev ceev faj rau reflow soldering tshuab
1. Txhawm rau kom muaj kev nyab xeeb ntawm tus kheej, tus neeg teb xov tooj yuav tsum tshem tawm daim ntawv lo thiab cov khoom dai, thiab lub tes tsho yuav tsum tsis txhob xoob dhau.
2 Ua tib zoo saib xyuas qhov kub thiab txias thaum lub sijhawm ua haujlwm kom tsis txhob scald tu
3. Tsis txhob arbitrarily teem lub cheeb tsam kub thiab ceev ntawmreflow soldering
4. Xyuas kom meej tias chav tsev yog qhov cua, thiab cov fume extractor yuav tsum coj mus rau sab nraud ntawm lub qhov rais.
Post lub sij hawm: Sep-07-2022