Cov lus piav qhia luv luv ntawm kev txhim kho ntawm yoj soldering tshuab
Wave soldering yog cov mos brazing ntawm molten solder (lead-tin alloy) los ntawm hluav taws xob lossis electromagnetic twj tso kua mis rau hauv cov qauv tsim ntawm cov yoj yoj, tuaj yeem tsim los ntawm kev txhaj tshuaj nitrogen rau hauv lub pas dej ua ke, kom cov khoom siv ua ntej ntawm cov ntawv luam tawm los ntawm cov yoj yoj, kom ua tiav qhov kev sib txuas ntawm cov tshuab thiab hluav taws xob ntawm qhov kawg ntawm cov khoom siv lossis cov pins thiab cov ntaub qhwv ntawm cov ntawv luam tawm mos brazing.
Wave soldering txheej txheem: ntxig cov khoom sib xyaw rau hauv qhov sib xyaw ua ke → thov ua ntej ntawm flux → ua ntej cua sov (kub 90-100} degree , ntev 1-1.2m) → yoj soldering (220-240 degree ) cua txias → txiav tawm tshaj qhov ntxig pins → tshuaj xyuas.
Cov txheej txheem reflow soldering yog ib tug mos brazing ntawm txhua yam thiab hluav taws xob kev sib txuas ntawm lub solder kawg ntawm nto los ua ke Cheebtsam los yog pins thiab luam boards los ntawm re-melting lub paste soft brazing solder pre-distributed rau lub board pads.
Wave soldering muaj txheej txheem vuam tshiab raws li tib neeg paub txog kev tiv thaiv ib puag ncig. Yav dhau los, tin-lead alloys tau siv, tab sis txhuas yog cov hlau hnyav uas tuaj yeem ua rau tib neeg lub cev tsis zoo. Qhov no tau ua rau cov txheej txheem tsis muaj hlau lead, siv lub * tin-silver-tooj liab alloy * thiab cov fluxes tshwj xeeb, thiab qhov kub thiab txias yog qhov yuav tsum tau ua rau qhov kub thiab txias.
Perforated (TH) los yog hybrid technology circuit boards tseem siv nyob rau hauv feem ntau cov khoom uas tsis tas yuav tsum tau miniaturization thiab siab zog, xws li TVs, tsev audio-visual khoom thiab digital set-top thawv, uas tseem siv perforated Cheebtsam thiab yog li ntawd yuav tsum tau siv. ntawm yoj soldering. Los ntawm cov txheej txheem ntawm kev pom, yoj soldering cov cav tov tsuas yog me me ntawm kev hloov kho rau cov tshuab ua haujlwm yooj yim tshaj plaws.
Covyoj soldering tshuabtxheej txheem
Thaum lub rooj tsavxwm tau nkag mus rau hauv lub tshuab yoj lub tshuab los ntawm txoj siv conveyor, nws dhau los ntawm qee hom ntawm cov ntawv thov flux qhov twg cov flux tau siv rau lub rooj tsavxwm siv yoj, ua npuas ncauj lossis tshuaj tsuag. Raws li feem ntau cov fluxes yuav tsum ncav cuag thiab tswj kom muaj qhov kub thiab txias thaum lub sij hawm soldering kom ua tiav ntub dej ntawm cov sib koom ua ke, lub rooj tsavxwm dhau los ntawm thaj chaw ua ntej cua sov ua ntej nkag mus rau hauv nthwv dej. Cov cua kub ua ntej tom qab siv flux maj mam nce qhov kub ntawm PCB thiab ua kom cov flux. Cov txheej txheem no kuj txo cov thermal shock generated thaum lub rooj sib txoos nkag mus rau lub yoj crest. Nws kuj tseem siv tau los ua kom cov dej noo uas yuav nqus tau los yog cov kuab tshuaj uas ua rau cov kuab tshuaj diluted, uas, yog tias tsis tshem tawm, tuaj yeem ua rau kub hnyiab thiab ua rau cov khoom tawg thaum nws dhau los ntawm cov nthwv dej, los yog tsim cov vapors uas nyob rau hauv lub solder. tsim hollow solder pob qij txha los yog grit. Tsis tas li ntawd, vim tias muaj peev xwm ua kom muaj cua sov ntau dua ntawm ob sab thiab ntau txheej boards, lawv yuav tsum tau ua kom sov siab dua li cov boards ib sab.
Feem ntau siv cov txheej txheem ntawm yoj soldering preheating yog yuam cua kub convection, hluav taws xob cua sov phaj convection, hluav taws xob cua sov pas nrig cua sov thiab infrared cua sov. Ntawm cov txheej txheem no, yuam cua kub convection feem ntau suav hais tias yog txoj hauv kev zoo tshaj plaws ntawm kev hloov hluav taws xob rau cov tshuab yoj soldering hauv feem ntau cov txheej txheem. Tom qab preheating, lub rooj tsavxwm yog soldered nrog ib tug nthwv dej (λ-wave) los yog ob yoj (scrambled thiab λ-yoj). Ib yoj ib leeg yog txaus rau perforated Cheebtsam. Thaum lub rooj tsavxwm nkag mus rau hauv nthwv dej, lub solder ntws nyob rau hauv qhov opposite kev taw qhia ntawm lub rooj tsavxwm txoj kev mus, tsim eddy tam sim no nyob ib ncig ntawm lub tivthaiv pins. Qhov no ua raws li kev txhuam txhuam, tshem tawm tag nrho cov seem ntawm cov kua nplaum thiab oxide zaj duab xis los ntawm sab saum toj, tsim kom poob thaum lub vuam sib txuas mus txog qhov kub thiab txias.
Rau hybrid thev naus laus zis sib dhos, scrambled nthwv dej feem ntau yog siv ua ntej λ nthwv dej. Cov nthwv dej no yog nqaim thiab cuam tshuam nrog lub siab ntsug siab dua, uas tso cai rau cov khoom siv kom nkag mus tau zoo ntawm cov pins muab tso rau hauv qhov chaw sib txuas thiab cov khoom siv saum npoo av (SMD), thiab tom qab ntawd λ yoj siv los ua kom tiav cov kev sib koom ua ke. Tag nrho cov kev qhia tshwj xeeb ntawm lub rooj tsavxwm yuav tsum tau soldered nrog nthwv dej yuav tsum tau txiav txim siab ua ntej kev soj ntsuam ntawm cov cuab yeej siv yav tom ntej thiab cov chaw muag khoom, vim tias cov no tuaj yeem txiav txim siab qhov ua tau zoo ntawm lub tshuab xav tau.
