SMT nplaum, tseem hu ua SMT nplaum, SMT liab nplaum, feem ntau yog xim liab (tseem daj lossis dawb) muab tshuaj txhuam sib npaug nrog cov tawv tawv, xim, hnyav thiab lwm cov nplaum, feem ntau yog siv los kho cov khoom ntawm lub rooj tsavxwm luam ntawv, feem ntau faib los ntawm kev xa tawm. los yog steel screen printing txoj kev. Tom qab affixing cov khoom, muab tso rau hauv qhov cub los yog reflow rauv rau cua sov thiab hardening. Qhov txawv ntawm nws thiab cov muab tshuaj txhuam yog tias nws tau kho tom qab cua sov, nws qhov chaw txias txias yog 150 ° C, thiab nws yuav tsis yaj tom qab reheating, uas yog hais tias, lub tshav kub hardening txheej txheem ntawm lub thaj yog irreversible. Kev siv cov nyhuv ntawm SMT nplaum yuav sib txawv vim cov thermal curing tej yam kev mob, cov khoom txuas nrog, cov cuab yeej siv, thiab qhov chaw ua haujlwm. Cov nplaum nplaum yuav tsum raug xaiv raws li cov txheej txheem luam tawm Circuit Board (PCBA, PCA).
Cov yam ntxwv, daim ntawv thov thiab kev cia siab ntawm SMT thaj nplaum
SMT liab kua nplaum yog ib hom polymer compound, cov khoom tseem ceeb yog cov khoom siv hauv paus (uas yog, cov khoom siv molecular siab), muab tub lim, kho tus neeg sawv cev, lwm yam khoom ntxiv thiab lwm yam. SMT liab kua nplaum muaj viscosity fluidity, kub yam ntxwv, wetting yam ntxwv thiab hais txog. Raws li cov yam ntxwv ntawm cov kua nplaum liab, hauv kev tsim khoom, lub hom phiaj ntawm kev siv cov kua nplaum liab yog ua kom cov khoom ruaj khov rau saum npoo ntawm PCB kom tsis txhob poob. Yog li ntawd, cov nplaum nplaum yog ib qho kev noj qab haus huv ntawm cov khoom lag luam tsis tseem ceeb, thiab tam sim no nrog kev txhim kho txuas ntxiv ntawm PCA tsim thiab txheej txheem, los ntawm lub qhov rov qab thiab ob sab reflow vuam tau pom, thiab PCA mounting txheej txheem siv cov nplaum nplaum. yog qhia txog qhov sib txawv ntawm tsawg thiab tsawg.
Lub hom phiaj ntawm kev siv SMT nplaum
① Tiv thaiv cov khoom los ntawm kev poob hauv yoj soldering (yoj txheej txheem soldering). Thaum siv yoj yoj soldering, cov khoom yog tsau rau ntawm cov ntawv luam tawm los tiv thaiv cov khoom los ntawm kev poob thaum cov ntawv luam tawm dhau los ntawm cov zawj.
② Tiv thaiv rau sab nraud ntawm cov khoom sib tsoo los ntawm kev sib tsoo hauv qhov rov qab vuam (ob npaug-sided reflow vuam txheej txheem). Nyob rau hauv cov txheej txheem ob-sab reflow welding, thiaj li yuav tiv thaiv cov khoom loj ntawm sab soldered los ntawm kev poob vim yog lub tshav kub melting ntawm solder, yuav tsum tau ua SMT patch kua nplaum.
③ Tiv thaiv kom tsis txhob txav thiab sawv ntawm cov khoom (reflow vuam txheej txheem, txheej txheem ua ntej txheej). Siv nyob rau hauv reflow vuam txheej txheem thiab pre-txheej txheej txheem los tiv thaiv kev khiav hauj lwm thiab riser thaum lub sij hawm mounting.
④ Mark (yoj vuam, reflow vuam, txheej ua ntej). Tsis tas li ntawd, thaum cov ntawv luam tawm thiab cov khoom hloov pauv hauv cov khoom siv, cov nplaum nplaum yog siv rau kev kos.
SMT nplaum yog cais raws li hom kev siv
a) Scraping hom: sizing yog nqa tawm los ntawm kev luam ntawv thiab scraping hom steel mesh. Txoj kev no yog siv dav tshaj plaws thiab tuaj yeem siv ncaj qha rau ntawm cov xovxwm solder paste. Cov hlau mesh qhov yuav tsum tau txiav txim siab raws li hom ntawm qhov chaw, kev ua haujlwm ntawm lub substrate, thickness thiab qhov loj thiab cov duab ntawm lub qhov. Nws qhov zoo yog kev kub ceev, kev ua haujlwm siab thiab tus nqi qis.
b) Dispensing type: Cov kua nplaum yog siv rau ntawm lub rooj tsav xwm luam tawm los ntawm cov khoom siv dispensing. Cov khoom siv tshwj xeeb yog xav tau, thiab tus nqi siab. Cov khoom siv dispensing yog siv cov cua compressed, cov kua nplaum liab los ntawm qhov tshwj xeeb dispensing lub taub hau mus rau lub substrate, qhov luaj li cas ntawm cov kua nplaum taw tes, ntau npaum li cas, los ntawm lub sij hawm, lub siab lub raj txoj kab uas hla thiab lwm yam tsis tswj, dispensing tshuab muaj ib tug saj zawg zog ua hauj lwm. . Rau qhov sib txawv, peb tuaj yeem siv lub taub hau sib txawv, teeb tsa cov kev hloov pauv, koj tuaj yeem hloov cov duab thiab qhov ntau ntawm cov nplaum nplaum, txhawm rau ua tiav cov txiaj ntsig, qhov zoo yog yooj yim, hloov tau thiab ruaj khov. Qhov tsis zoo yog qhov yooj yim kom muaj hlau kos duab thiab npuas. Peb tuaj yeem kho qhov kev khiav hauj lwm tsis, ceev, lub sij hawm, huab cua siab, thiab kub kom txo tau cov shortcomings.
SMT Patching Hom CICC
ceev faj:
1. Qhov kub curing ntau dua thiab lub sijhawm kho lub sijhawm ntev dua, cov nplaum nplaum muaj zog dua.
2. Vim tias qhov kub ntawm cov nplaum nplaum yuav hloov nrog qhov loj ntawm cov substrate qhov chaw thiab cov ntawv nplaum, peb pom zoo kom nrhiav tau qhov tsim nyog hardening tej yam kev mob.
SMT thaj ua kua nplaum cia
Nws tuaj yeem khaws cia rau 7 hnub ntawm chav tsev kub, kev cia siab ntau dua Lub Rau Hli ntawm tsawg dua 5 ° C, thiab tuaj yeem khaws cia ntau tshaj 30 hnub ntawm 5-25 ° C.
SMT thaj chaw tswj cov pos hniav
Vim tias SMT thaj xim liab kua nplaum cuam tshuam los ntawm qhov kub thiab txias, cov yam ntxwv ntawm viscosity, liquidity, thiab ntub dej ntawm SMT, SMT thaj liab kua nplaum yuav tsum muaj qee yam kev mob thiab kev tswj hwm tus qauv.
1) Cov kua nplaum liab yuav tsum muaj tus lej tshwj xeeb, thiab cov lej raws li tus naj npawb ntawm kev pub mis, hnub tim, thiab hom.
2) Cov kua nplaum liab yuav tsum muab cia rau hauv lub tub yees ntawm 2 txog 8 ° C kom tsis txhob muaj cov yam ntxwv ntawm cov yam ntxwv vim qhov kub thiab txias.
3) Liab kua nplaum rov qab yuav tsum tau 4 teev nyob rau hauv chav tsev kub, thiab yog siv nyob rau hauv kev txiav txim siab ua ntej.
4) Rau cov ntsiab lus ntxiv kev ua haujlwm, cov kua nplaum kua nplaum liab yuav tsum tsim. Rau cov kua nplaum liab uas tsis tau siv ib zaug, nws yuav tsum muab tso rau hauv lub tub yees kom txuag tau.
5) Sau daim ntawv sau cia kom raug. Lub sij hawm rov qab thiab sov so yuav tsum tau siv. Tus neeg siv yuav tsum paub meej tias qhov rov qab ua tiav ua ntej nws tuaj yeem siv tau. Feem ntau, cov kua nplaum liab siv tsis tau.
SMT thaj nplaum cov txheej txheem cov yam ntxwv
Kev sib txuas siv: SMT thaj nplaum yuav tsum muaj lub zog sib txuas. Tom qab hardened, qhov kub ntawm lub weld yaj yog tsis peeled.
Point txheej: Tam sim no, txoj kev faib khoom ntawm cov ntawv luam ntawv feem ntau yog siv, yog li nws yuav tsum muaj cov haujlwm hauv qab no:
① Kho kom haum rau ntau daim ntawv nplaum
② Yooj yim los teeb tsa cov khoom ntawm txhua qhov khoom
③ Tsuas yog hloov kho rau cov khoom siv hloov pauv
④ Point txheej ruaj khov
Kho kom haum rau cov tshuab high-speed: Cov nplaum nplaum tam sim no yuav tsum tau ua kom tau raws li cov txheej txheem siab-ceev thiab lub tshuab patch high-speed. Tshwj xeeb tshaj yog, lub siab-ceev dot yog kos tsis tau kos duab, thiab thaum lub siab-ceev muab tshuaj txhuam yog ntsia, cov ntawv luam tawm yog nyob rau hauv tus txheej txheem ntawm kev sib kis. Cov nplaum nplaum ntawm cov pos hniav yuav tsum xyuas kom meej tias cov khoom tsis txav mus los.
Ritting thiab ntog: Thaum cov nplaum nplaum yog stained ntawm lub ncoo, cov khoom siv tsis tuaj yeem txuas nrog hluav taws xob sib txuas nrog cov ntawv luam tawm. Kom tsis txhob muaj pa phem.
Tsis tshua muaj kub curing: Thaum solidifying, thawj zaug siv lub ncov-welded tsis txaus tshav kub-resistant inserted Cheebtsam yuav tsum tau welded, yog li nws yuav tsum tau hais tias cov hardening tej yam kev mob yuav tsum tau raws li qhov kub thiab txias thiab lub sij hawm luv luv.
Self-adjustability: Nyob rau hauv lub re-welding thiab pre-txheej txheej txheem, lub thaj kua nplaum yog solidified thiab tsau Cheebtsam ua ntej lub weld melted, yog li nws yuav cuam tshuam lub sinking ntawm lub meta thiab nws tus kheej-kho. Rau qhov no, manufacturers tau tsim ib tug self-adjustable thaj kua nplaum.
SMT thaj ua rau cov teeb meem tshwm sim, qhov tsis xws luag thiab tsom xam
Lub zog tsis txaus
Lub zog thrust ntawm 0603 capacitor yog 1.0kg, qhov tsis kam yog 1.5kg, lub zog thrust ntawm 0805 capacitor yog 1.5kg, thiab qhov tsis kam yog 2.0kg.
Feem ntau tshwm sim los ntawm cov laj thawj hauv qab no:
1. Cov kua nplaum tsis txaus.
2. Tsis muaj 100% solidification ntawm cov colloid.
3. PCB boards los yog cov khoom muaj kuab paug.
4. Lub colloid nws tus kheej yog crispy thiab tsis muaj zog.
Tentile tsis ruaj khov
Lub 30ml syringe kua nplaum yuav tsum raug ntaus los ntawm lub siab kaum tawm txhiab zaus kom tiav, yog li nws yuav tsum muaj qhov zoo heev tactileness nws tus kheej, txwv tsis pub nws yuav ua rau cov kua nplaum tsis ruaj khov thiab cov kua nplaum tsawg. Thaum welding, cov khoom ntog tawm. Ntawm qhov tsis sib xws, cov kua nplaum ntau dhau, tshwj xeeb tshaj yog rau cov khoom me me, yog ib qho yooj yim los lo rau ntawm lub ncoo, cuam tshuam kev sib txuas hluav taws xob.
Tsis txaus los yog leakage point
Yog vim li cas thiab kev tiv thaiv:
1. Lub net board rau luam ntawv tsis tu ncua, thiab ethanol yuav tsum tau ntxuav txhua 8 teev.
2. Cov colloid muaj impurities.
3. Qhov qhib ntawm lub mesh tsis tsim nyog los yog me me dhau los yog cov kua nplaum roj siab tsawg dhau.
4. Muaj npuas nyob rau hauv lub colloid.
5. ntsaws lub taub hau los thaiv, thiab tam sim ntawd ntxuav lub qhov ncauj roj hmab.
6. Lub preheating kub ntawm qhov taw tes ntawm daim kab xev tsis txaus, thiab qhov kub ntawm cov kais dej yuav tsum tau teem rau ntawm 38 ° C.
Txhuam
Lub thiaj li hu ua txhuam yog tias lub thaj tsis tawg thaum lub dicture, thiab lub thaj yog txuas nrog lub dot-headed kev taw qhia. Muaj ntau cov xov hlau, thiab cov nplaum nplaum yog npog ntawm cov ntawv luam tawm, uas yuav ua rau cov vuam tsis zoo. Tshwj xeeb tshaj yog thaum qhov loj me, qhov tshwm sim no feem ntau tshwm sim thaum koj siv koj lub qhov ncauj. Kev daws teeb meem ntawm cov nplaum nplaum txhuam yog feem ntau cuam tshuam los ntawm nws cov khoom tseem ceeb ntawm cov txhuam hniav thiab cov chaw ntawm cov ntsiab lus txheej txheej:
1. Ua kom cov dej ntws tawm kom txo tau qhov txav ceev, tab sis nws yuav txo koj qhov kev sib tw ntau lawm.
2. Cov viscosity tsawg tsawg, cov khoom siv high-kov, qhov me dua qhov nyiam ntawm kev kos duab, yog li sim xaiv hom kab xev no.
3. me ntsis nce qhov kub ntawm lub thermal regulator, thiab kho nws mus rau ib tug tsawg viscosity, high-kov thiab degeneration thaj ua rau cov kua nplaum. Lub sijhawm no, lub sijhawm khaws cia ntawm cov nplaum nplaum thiab lub siab ntawm lub taub hau kais yuav tsum raug txiav txim siab.
Kaw
Lub liquidity ntawm daim nplaum nplaum ua rau tawg. Qhov teeb meem tshwm sim ntawm kev sib tsoo yog tias nws yuav ua rau lub cev qhuav dej tom qab muab tso rau lub sijhawm ntev. Yog tias cov nplaum nplaum txuas ntxiv mus rau lub ncoo ntawm lub rooj tsav xwm luam tawm, nws yuav ua rau cov vuam tsis zoo. Thiab rau cov khoom siv nrog cov pins siab, nws tsis tuaj yeem tiv tauj lub cev tseem ceeb ntawm cov khoom, uas yuav ua rau tsis txaus adhesion. Yog li ntawd, nws yog ib qho yooj yim rau kev vau. Nws yog kwv yees, yog li thawj qhov chaw ntawm nws cov ntsiab lus txheej kuj nyuaj. Hauv kev teb rau qhov no, peb yuav tsum xaiv cov uas tsis yooj yim rau kev tawg. Rau lub cev qhuav dej tshwm sim los ntawm dotted ntev dhau lawm, peb tuaj yeem siv cov nplaum nplaum thiab khov kho hauv lub sijhawm luv luv kom tsis txhob muaj.
Cheebtsam offset
Cheebtsam offset yog qhov tshwm sim tsis zoo uas ua rau cov tshuab ua haujlwm siab ceev. Qhov laj thawj tseem ceeb yog:
1. Nws yog qhov offset tsim los ntawm XY kev taw qhia thaum cov ntawv luam tawm yog txav ntawm qhov kub ceev. Qhov no tshwm sim yog nquag tshwm sim ntawm cov tivthaiv nrog me me kua nplaum txheej cheeb tsam. Qhov laj thawj yog tshwm sim los ntawm adhesion.
2. Nws yog qhov tsis sib haum nrog cov kua nplaum hauv qab cov khoom (piv txwv li: 2 cov kua nplaum nplaum hauv qab IC, lub nplaum nplaum yog qhov loj thiab cov kua nplaum me me). Thaum cov kua nplaum yog rhuab thiab solidified, lub zog tsis sib npaug, thiab ib qho kawg nrog ib qho me me ntawm cov kua nplaum yog yooj yim rau offset.
Vuam ib feem ntawm lub ncov
Qhov laj thawj yog qhov nyuaj heev:
1. Tsis txaus adhesion rau patch kua nplaum.
2. Ua ntej vuam ntawm cov nthwv dej, nws raug ntaus ua ntej vuam.
3. Muaj ntau qhov seem ntawm qee yam khoom.
4. Qhov kub thiab txias cuam tshuam ntawm colloidity tsis tiv taus kub
Patch kua nplaum sib xyaw
Txawv manufacturers txawv heev nyob rau hauv tshuaj muaj pes tsawg leeg. Kev siv sib xyaw ua ke ua rau muaj kev cuam tshuam ntau heev: 1. Tsau nyuaj; 2. Tsis txaus adhesion; 3. Qhov hnyav welded hla lub ncov.
Cov tshuaj yog: kom huv si ntxuav lub mesh, scraper, thiab taw tes-headed lub taub hau, uas yog ib qho yooj yim mus ua kom sib xyaw kom tsis txhob sib tov siv ntau hom ntawm patch kua nplaum.
Post lub sij hawm: Jun-19-2023
