SMT txheej txheem Taw qhia
SMT txheej txheem qhia
SMT yog hais txog cov thev naus laus zis thev naus laus zis, tseem hu ua cov cuab yeej sib dhos saum npoo, yog raws li cov ntawv luam tawm Circuit Board PCB tivthaiv SMT ua thiab vuam, hu ua SMT. Nws yog cov txheej txheem nrov tshaj plaws rau cov khoom siv hluav taws xob ua thiab vuam. Cov txheej txheem tseem ceeb ntawm SMT suav nrog cov luam ntawv luam tawm, cov khoom siv hluav taws xob txuas, rov ua vuam, AOI kho qhov muag qhov chaw kuaj pom, X-ray kev pom pom, kev saib xyuas, tu, thiab lwm yam. Niaj hnub no, cov khoom siv hluav taws xob tau nce mus nrhiav miniaturization, thiab dhau los ntawm lub qhov. plug-in hom tsis tuaj yeem ua tau raws li qhov xwm txheej tam sim no, yog li tsuas yog siv tshuab mounting tuaj yeem siv rau SMT.
Ua ntej ntawm tag nrho cov, cov txheej txheem tseem ceeb ntawm SMT SMT ua yog: solder paste printing (liab kua nplaum luam ntawv), SPI, SMT, reflow vuam, AOI nrhiav pom, X-ray, kho, tu. Nov yog li cas txhua tus txheej txheem ua haujlwm.
1. Printing solder paste: ua ntej, cov ntawv luam tawm ntawm lub rooj tsavxwm yog tsau rau ntawm qhov chaw luam ntawv, thiab tom qab ntawd cov nplaum nplaum los yog cov kua nplaum liab yog luam tawm los ntawm cov hlau nplaum los ntawm cov khoom siv PCB los ntawm scraper ua ntej thiab tom qab luam ntawv, thiab PCB nrog cov ntawv luam tawm tsis sib xws yog nkag mus rau cov txheej txheem tom ntej los ntawm lub rooj sib kis. Solder paste thiab thaj yog thixodiants nrog viscosity. Thaum lub solder paste xovxwm txav mus rau pem hauv ntej ntawm ib qho kev ceev thiab lub kaum sab xis, nws tsim ib qho kev siab ntawm cov tshuaj txhuam hniav, thiab thawb cov nplaum nplaum rau dov rau pem hauv ntej ntawm lub scraper, ua rau lub siab yuav tsum tau txhaj cov tshuaj txhuam rau hauv mesh lossis xau qhov. Cov nplaum sib txhuam quab yuam ntawm cov nplaum nplaum ua cov shear ntawm qhov sib txuas ntawm cov scraper ntawm cov tshuab luam ntawv muab tshuaj txhuam thiab cov phaj phaj. Lub zog shear txo cov viscosity ntawm solder paste, uas yog qhov tsim nyog rau kev txhaj tshuaj ntawm cov tshuaj pleev xim rau hauv qhov qhib qhov ntawm cov hlau.
2.SPI: SPI plays lub luag haujlwm tseem ceeb hauv tag nrho SMT SMT ua. Nws yog tag nrho tsis siv neeg ntsuas tsis sib cuag, siv tom qab lub tshuab luam ntawv tin thiab ua ntej lub tshuab SMT. 2D los yog 3D ntsuas (micron qib raug) ntawm solder tom qab PCB luam ntawv yog nqa tawm los ntawm cov qauv lub teeb ntsuas (mainstream) los yog laser ntsuas (tsis yog-mainstream) thiab lwm yam kev txhais tau tias. Lub hauv paus ntsiab lus ntawm kev ntsuas lub teeb: lub koob yees duab siab CCD tau teeb tsa ncaj qha ntawm cov khoom (PCB thiab tin), thiab lub projector yog siv los irradiate periodic polarized lub teeb los yog cov duab rau cov khoom los ntawm oblique sab saum toj. Nyob rau hauv lub xub ntiag ntawm ib tug ntau dua tivthaiv nyob rau hauv lub PCB, ib tug duab ntawm lub stripe hloov nrog rau lub hauv paus dav hlau. Siv txoj cai triangulation, tus nqi offset hloov mus rau qhov sib npaug.
3. SMT: Tom qab SPI, lub tshuab SMT yog ib qho cuab yeej uas raug tso rau saum npoo ntawm lub PCB ncoo los ntawm kev txav lub taub hau. Nws yog siv los ua kom tiav kev kub ceev, qhov tseeb ntawm cov cuab yeej, yog SMT SMT kev ua haujlwm thiab kev tsim khoom ntawm qhov tseem ceeb tshaj plaws, cov cuab yeej siv yooj yim tshaj plaws.
4. Reflow welding: Reflow welding yog los ntawm remelting lub solder paste ua ntej faib rau PCB ncoo, kom ua tiav txhua yam thiab hluav taws xob kev twb kev txuas ntawm lub solder kawg los yog tus pin ntawm lub nto los ua ke SMT ua khoom thiab lub PCB ncoo. Lub tshuab reflow vuam siv nyob rau hauv reflow vuam yog nyob rau hauv qhov kawg ntawm SMT kab.
5.AOI: Cov duab scanning yog tsim raws li lub hauv paus ntsiab lus ntawm kev xav ntawm lub teeb thiab cov yam ntxwv ntawm kev sib txawv muaj peev xwm ntawm tooj liab thiab substrate rau lub teeb. Tus qauv duab muab piv thiab soj ntsuam nrog cov duab phaj txheej tiag tiag los txiav txim seb cov khoom kuaj pom puas yog OK.
6.X-ray: X-ray ntes cov cuab yeej nkag mus rau PCBA kom kuaj los ntawm X-ray, thiab tom qab ntawd tso cov duab X-ray hauv cov duab ntes. Cov duab zoo yog tsuas yog txiav txim siab los ntawm kev daws teeb meem thiab qhov sib piv. Cov cuab yeej no feem ntau nyob hauv ib chav sib cais hauv SMT Rhiav.
7. Kho: kho lub rooj tsav xwm PCB nrog cov pob qij txha tsis zoo kuaj pom los ntawm AOI. Cov cuab yeej muaj xws li soldering hlau thiab phom kub. Kho txoj haujlwm nyob txhua qhov chaw ntawm cov kab ntau lawm.
8. Kev tu: tu yog tsuas yog tshem tawm cov slag solder ntawm PCBA board ua tiav los ntawm thaj. Cov cuab yeej siv yog lub tshuab ntxuav, uas yog tsau nyob rau hauv lub off-line rov qab kawg los yog ntim cheeb tsam.
