Tusham muab tshuaj printingyog qhov tseem ceeb heev rau kev ua haujlwm zoo ntawm PCBA, nws ncaj qha txiav txim siab tag nrho vuam nyhuv ntawm PCBA, nyob rau hauv cov txheej txheem ntawm PCBA kev ua, yuav ua li cas ua txoj haujlwm zoo ntawm solder paste printing tau dhau los ua teeb meem uas cov thawj tswj ntau lawm yuav tsum xav txog. Cov nyhuv ntawm solder muab tshuaj txhuam luam ntawv muaj plaub ntu: steel mesh, ham muab tshuaj, txheej txheem luam ntawv thiab txheej txheem tshuaj xyuas.
I.Steel mesh
Qhov qhib ntawm cov hlau mesh yuav tsum tsim kho kom zoo lossis txo kom nruj raws li kev teeb tsa ntawm cov khoom siv hluav taws xob ntawm lub rooj sib tw PCBA, thiaj li txiav txim siab qhov nyiaj ntawm tin nyob rau hauv cov ntaub qhwv, kom thiaj li ua tiav cov txiaj ntsig zoo soldering thiab zam qhov tshwm sim ntawm kev sib txuas thiab tsawg dua tin, uas yuav tsum tau soj ntsuam nruj los ntawm tus txheej txheem engineer. Tsis tas li ntawd, cov khoom siv ntawm cov hlau mesh kuj tseem ceeb dua, uas cuam tshuam rau qhov nro ntawm cov hlau mesh thiab lub neej ntawm kev siv dua.
Tsis tas li ntawd, cov hlau mesh ua ntej pub rau tu thiab chaw cia khoom yog qhov tseem ceeb heev. Txhua lub sijhawm ua ntej "on-line" yuav tsum tau nqa tawm ntawm kev ntxuav kom nruj, thiab xyuas seb lub qhov puas tau thaiv, muaj cov tin slag thiab lwm yam xwm txheej. Qee tus neeg tsim khoom PCBA tau xav yuav cov steel mesh tensiometer thiab kuaj qhov nruj ntawm cov hlau mesh ua ntej pub rau txhua zaus.
II.Solder muab tshuaj txhuam
Cov tshuaj txhuam cov tub rog yuav tsum xaiv cov khoom lag luam qib siab lossis qib siab dua, xws li ntau txhiab tus nyob, vittor ob peb, muaj kub lossis nyiaj thiab lwm cov khoom xyaw dhia zoo dua. Cov tshuaj txhuam zaws yuav tsum nruj me ntsis hauv lub tub yees ntawm 2 txog 10 degrees, thiab cov txheeb cais yuav tsum tau ua rau txhua qhov nkag thiab tawm sab nraud, thiab kev rov ua dua ntawm kev muab tshuaj txhuam yuav tsum muaj kev tswj hwm tsis pub dhau ntawm IPC cov qauv, thiab cov ham cov txheej txheem sib tsoo cov txheej txheem yuav tsum ua kom nruj ua ntej siv "on-line".
III.solder muab tshuaj txhuam luam ntawv
Tam sim no, cov tuam ntxhab siv lub tshuab ntxhua khaub noom tsis siv neeg lub tshuab luam ntawv, nws cov khoom tuaj yeem tswj tau qhov zoo ntawm cov luam ntawv thiab nrawm ntawm cov tsis, thiab muaj qee yam tsis siv neeg ua haujlwm tsis huv. Tus neeg teb xov tooj tsuas xav tau tsim cov kev ntsuas kom nruj raws li cov kev cai.
Hauv kev tsim cov huab hwm coj, nws yog qhov tseem ceeb tshwj xeeb los kuaj qhov kev tshwm sim xws li lub qhov thaiv thiab qhov sib txawv ntawm cov hlau mesh, tshwj xeeb tshaj yog thaum qee qhov tsis xws luag tshawb pom los ntawm SPI qhia txog kev nce siab tom qab luam ntawv, nws yog qhov yuav tsum tau nres lub tshuab kom kuaj xyuas qhov kev khiav cov xwm txheej ntawm cov hlau mesh nws tus kheej.
IV.SPI tshawb pom cov nyhuv luam tawm
Tom qab cov tshuab muab tshuaj txhuam tshuab luam ntawv, nws yog qhov tseem ceeb tshwj xeeb los txhim kho SPI solder paste ntes, uas tuaj yeem kuaj pom ntau qhov tsis xws luag hauv cov txheej txheem ham cov tshuab luam ntawv, xws li tsawg dua tin, tin, thais, xaim duab, sib txawv thiab lwm yam. Txhawm rau ua tiav tag nrho vuam tus nqi PPM.
Kev tswj hwm ntawm ham txoj kev luam ntawv ua haujlwm nws tus kheej tsis pub leej twg paub, nws yuav tsum muaj cov thawj coj ua tib zoo ua txhua txoj kev tswj hwm hauv PCBA cov txheej txheem. Thiab tsim cov txheej txheej kaw lub tshuab kaw haujlwm kom pom thiab tshawb pom qhov tsis meej.