Nyob hauv cov khoom siv hluav taws xob niaj hnub no, muaj qhov sib txawv tsis tu ncua ntawm qhov tseeb tias cov xaim hluav taws xob tau ua ntau dua. Qhov tshwm sim ntawm qhov no yog qhov tshwm sim ntawm BGA pob. Soldering cov qauv hauv tsev yuav tau tham los ntawm peb hauv kab lus no.
cov ntaub ntawv dav dav
Thaum xub thawj, ntau tus pins tau muab tso rau hauv cov ntaub ntawv microcircuit. Ua tsaug rau qhov no, lawv tau nyob hauv thaj chaw me me. Qhov no tso cai rau koj txuag sijhawm thiab tsim cov khoom siv me me. Tab sis lub xub ntiag ntawm xws li ib tug mus kom ze nyob rau hauv lub chaw tsim tshuaj paus hloov mus rau hauv inconveniences thaum lub sij hawm kho cov khoom siv hluav taws xob hauv BGA pob. Soldering nyob rau hauv cov ntaub ntawv no yuav tsum yog raws li qhov ua tau thiab ua raws nraim li cov thev naus laus zis.
Koj xav tau dabtsi rau haujlwm?
Stock Up:
- chaw nres tsheb nrog rab phom cua kub.
- Tweezers.
- Solder paste.
- Insulating daim kab xev.
- Braid for desoldering.
- Flux (xav tau ntoo thuv).
- Stencil (kom siv cov tshuaj txhuam rau ntawm microcircuit) lossis spatula (tab sis nws yog qhov zoo dua los nres ntawm qhov kev xaiv thawj zaug).
Soldering BGA rooj tsis yog qhov nyuaj. Tab sis nyob rau hauv thiaj li yuav ua tau zoo siv, nws yog tsim nyog los npaj lub chaw ua hauj lwm. Kuj rau qhov ua taurepetition ntawm kev ua tau piav nyob rau hauv tsab xov xwm, koj yuav tsum tau tham txog cov yam ntxwv. Tom qab ntawd cov thev naus laus zis ntawm soldering microcircuits hauv pob BGA yuav tsis nyuaj (yog tias koj muaj kev nkag siab txog cov txheej txheem).
Ntse
Qhia seb lub tshuab ntawm cov khoom siv BGA yog dab tsi, nws yog ib qho tsim nyog yuav tsum nco ntsoov cov xwm txheej rau qhov muaj peev xwm rov ua dua. Yog li ntawd, Suav stencils tau siv. Lawv feature yog hais tias ntawm no ob peb chips yog sib sau ua ke ntawm ib tug loj workpiece. Vim li no, thaum rhuab, stencil pib khoov. Qhov loj ntawm lub vaj huam sib luag ua rau lub fact tias thaum rhuab, nws yuav tshem tawm ib tug tseem ceeb npaum li cas ntawm tshav kub (uas yog, ib tug radiator nyhuv tshwm sim). Vim li no, nws yuav siv sij hawm ntau dua los ua kom sov lub nti (uas cuam tshuam tsis zoo rau nws qhov kev ua tau zoo). Tsis tas li ntawd, xws li stencils yog tsim los ntawm kev siv tshuaj etching. Yog li ntawd, qhov muab tshuaj txhuam tsis yog siv yooj yim li ntawm cov qauv txiav laser. Zoo, yog tias muaj thermal seams. Qhov no yuav tiv thaiv cov stencils ntawm dabtsi yog khoov thaum lawv kub. Thiab thaum kawg, nws yuav tsum raug sau tseg tias cov khoom siv laser txiav muab qhov tseeb siab (kev sib txawv tsis tshaj 5 microns). Thiab ua tsaug rau qhov no, koj tuaj yeem yooj yim thiab yooj yim siv tus qauv tsim rau nws lub hom phiaj. Qhov no xaus qhov kev taw qhia, thiab peb yuav kawm txog dab tsi thev naus laus zis ntawm soldering BGA rooj plaub hauv tsev yog.
Kev npaj
Ua ntej koj pib soldering lub nti, koj yuav tsumsiv strokes raws ntug ntawm nws lub cev. Qhov no yuav tsum tau ua yog tias tsis muaj silkscreen uas qhia txog txoj haujlwm ntawm cov khoom siv hluav taws xob. Qhov no yuav tsum tau ua nyob rau hauv thiaj li yuav pab txhawb qhov kev tso kawm tom ntej ntawm lub nti rov qab rau ntawm lub rooj tsavxwm. Lub tshuab ziab plaub hau yuav tsum tsim kom muaj cua sov ntawm 320-350 degrees Celsius. Nyob rau hauv rooj plaub no, huab cua ceev yuav tsum tsawg heev (tsis li ntawd koj yuav tau solder lub me me ntawm nws). Lub tshuab ziab plaub hau yuav tsum tuav kom nws yog perpendicular rau lub rooj tsavxwm. Cia nws sov li ib feeb. Tsis tas li ntawd, huab cua yuav tsum tsis txhob raug coj mus rau qhov chaw, tab sis raws li ib puag ncig (ntev) ntawm lub rooj tsavxwm. Qhov no yog qhov tsim nyog kom tsis txhob overheating ntawm cov siv lead ua. Nco tshwj xeeb tshaj yog rau qhov no. Tom qab ntawd koj yuav tsum rub lub nti ntawm ib kawg thiab nqa nws saum lub rooj tsavxwm. Hauv qhov no, koj yuav tsum tsis txhob sim rhuav tag nrho koj lub zog. Tom qab tag nrho, yog hais tias lub solder tsis tag melted, ces muaj kev pheej hmoo ntawm tearing tawm lem. Qee lub sij hawm thaum koj siv cov flux thiab kub nws, lub solder yuav pib tsim cov pob. Lawv qhov loj me yuav tsis sib npaug hauv qhov no. Thiab cov chips soldering hauv pob BGA yuav ua tsis tiav.
Kev ntxuav tes
Thov cawv rosin, ua kom sov thiab khaws cov khib nyiab. Nyob rau tib lub sij hawm, thov nco ntsoov tias xws li ib tug mechanism yuav tsum nyob rau hauv tsis muaj cov ntaub ntawv siv thaum ua hauj lwm nrog soldering. Qhov no yog vim qhov tsawg coefficient. Tom qab ntawd koj yuav tsum ntxuav thaj tsam ntawm kev ua haujlwm, thiab yuav muaj qhov chaw zoo. Tom qab ntawd koj yuav tsum tau tshuaj xyuas qhov xwm txheej ntawm cov lus xaus thiab ntsuas seb nws puas tuaj yeem txhim kho lawv hauv qhov qub. Yog tias cov lus teb tsis zoo, lawv yuav tsum tau hloov. Yog vim li cascov laug cam thiab microcircuits yuav tsum tau muab ntxuav los ntawm qub solder. Kuj tseem muaj qhov ua tau tias "penny" ntawm lub rooj tsavxwm yuav raug torn tawm (thaum siv lub braid). Nyob rau hauv cov ntaub ntawv no, ib tug yooj yim soldering hlau yuav pab tau. Txawm hais tias qee tus neeg siv ob lub braid thiab lub tshuab ziab khaub ncaws. Thaum ua cov manipulations, kev ncaj ncees ntawm lub npog ntsej muag yuav tsum tau saib xyuas. Yog hais tias nws puas lawm, ces lub solder yuav kis tau raws li lem. Thiab ces BGA soldering yuav ua tsis tau.
Knurling new balls
Koj tuaj yeem siv cov blanks uas twb tau npaj lawm. Nyob rau hauv rooj plaub no, lawv tsuas yog yuav tsum tau nthuav tawm ntawm cov ntaub qhwv thiab yaj. Tab sis qhov no tsuas yog tsim nyog rau qee tus pins (koj puas tuaj yeem xav txog lub microcircuit nrog 250 "ceg"?). Yog li ntawd, stencil technology yog siv los ua ib txoj kev yooj yim dua. Ua tsaug rau nws, kev ua haujlwm yog nqa tawm sai dua thiab zoo tib yam. Qhov tseem ceeb ntawm no yog kev siv cov khoom siv zoo tshaj plaws. Nws yuav tam sim ntawd tig mus rau hauv ib lub pob ci ntsa iab. Ib daim ntawv theej tsis zoo yuav tawg mus rau ntau qhov me me "sib cais". Thiab nyob rau hauv cov ntaub ntawv no, nws tsis yog ib qho tseeb hais tias cua sov mus txog 400 degrees ntawm tshav kub thiab sib tov nrog flux yuav pab tau. Rau kev yooj yim, lub microcircuit yog tsau nyob rau hauv ib tug stencil. Cov tshuaj txhuam hniav yog tom qab ntawd siv lub spatula (txawm tias koj tuaj yeem siv koj tus ntiv tes). Tom qab ntawd, thaum txhawb cov stencil nrog tweezers, nws yog ib qhov tsim nyog los yaj cov muab tshuaj txhuam. Qhov kub ntawm lub tshuab ziab plaub hau yuav tsum tsis pub tshaj 300 degrees Celsius. Hauv qhov no, cov cuab yeej nws tus kheej yuav tsum yog perpendicular rau muab tshuaj txhuam. Lub stencil yuav tsum tau txhawb kom txog thaumlub solder yuav tsis qhuav tag. Tom qab ntawd, koj tuaj yeem tshem tawm cov mounting insulating daim kab xev thiab siv lub tshuab ziab plaub hau, uas yuav ua kom cua sov rau 150 degrees Celsius, maj mam ua kom sov kom txog thaum flux pib yaj. Tom qab ntawd, koj tuaj yeem txiav lub microcircuit los ntawm stencil. Qhov kawg tshwm sim yuav yog cov pob du. Lub microcircuit yog npaj txhij los nruab rau ntawm lub rooj tsavxwm. Raws li koj tau pom, soldering BGA rooj tsis nyuaj txawm nyob hauv tsev.
Nyob zoo ib tsoom niam txiv kwv tij neej tsas sawv daws.
Nws tau pom zoo yav dhau los ua kom tiav kov. Yog tias cov lus qhia no tsis raug coj mus rau hauv tus account, qhov chaw yuav tsum tau ua raws li hauv qab no:
- Tig IC kom nws pins.
- Tau ntug rau cov npib tsib xee kom lawv phim cov pob.
- Kho qhov twg cov npoo ntawm microcircuit yuav tsum yog (rau qhov no koj tuaj yeem siv cov khawb me me nrog rab koob).
- Kho ua ntej ib sab, tom qab ntawd perpendicular rau nws. Yog li ntawd, ob daim khawb yuav txaus.
- Peb muab cov nti raws li cov cim thiab sim ntes cov npib tsib xee ntawm qhov siab siab tshaj plaws nrog cov khoom los ntawm kov.
- Cua qhov chaw ua haujlwm kom txog thaum lub solder yog molten. Yog tias cov ntsiab lus yav dhau los tau ua tiav raws nraim, ces lub microcircuit yuav tsum poob rau hauv qhov chaw yam tsis muaj teeb meem. Nws yuav pab tau nyob rau hauv qhov no los ntawm lub nto nro quab yuam uas lub solder muaj. Hauv qhov no, nws yuav tsum tau siv me ntsis flux.
Zoo kawg
Qhov no yog qhov hu ua "BGA chip soldering technology". Yuav tsumNws yuav tsum tau muab sau tseg tias ntawm no ib tug soldering hlau, uas yog tsis paub rau feem ntau cov xov tooj cua amateurs, yog siv, tab sis ib tug plaub hau tshuab. Tab sis txawm qhov no, BGA soldering qhia tau zoo. Yog li ntawd, lawv tseem siv nws thiab ua tau zoo heev. Txawm hais tias tus tshiab yeej ib txwm ntshai ntau tus, tab sis nrog kev ua tau zoo, cov cuab yeej no dhau los ua cov cuab yeej paub.
