Qhov no yog qhov tsis xws luag ntawm lub tshuab hluav taws xob, thiab nws yog feem ntau yooj yim kom pom hauv cov txheej txheem ntau lawm ntawm SMT nti kev ua. Rau lub tuam txhab ua khoom lag luam tau mob siab rau muab cov kev pabcuam zoo, txhua yam kev ua tsis zoo yuav tsum daws. Yuav kom daws tau qhov teeb meem, peb yuav tsum xub paub qhov ua rau nws tshwm sim. Yog li dab tsi yog qhov laj thawj ntawm lub kaus mom hlaws dai?
1. Xaiv los ntawm ham muab tshuaj
1. Cov ntsiab lus hlau
Feem ntau, cov ntsiab lus hlau thiab qhov loj piv hauv cov ntawv ci ham muaj li ntawm 88% txog 92%, thiab qhov ntim qib yog li 50%. Thaum cov hlau cov ntsiab lus nce, qhov viscosity ntawm ham lub cev nce ntxiv, uas tuaj yeem tiv taus qhov kev quab yuam los ntawm vaporization thaum vuam ua ntej txheej txheem ntawm SMT nti ua. Qhov nce ntawm cov ntsiab lus hlau ua rau cov hmoov hlau zoo sib sau ua ke, ua rau nws yooj yim los sib txuas tsis tas yog muab pov tseg thaum yaj.
2. Oxidation degree ntawm cov hmoov hlau
Cov qib siab dua ntawm oxidation ntawm hlau hmoov nyob rau hauv cov muab tshuaj txhuam, ntau dua qhov kev sib raug zoo ntawm cov hlau hmoov thaum soldering, thiab ham muab tshuaj yuav tsis yooj yim ntub ntawm PCBA ncoo thiab nti tivthaiv, uas ua rau txo qis solderability.
3. Cov hmoov hlau loj
Qhov me me qhov loj me me ntawm cov hmoov hlau hauv cov muab tshuaj txhuam cov zom zaws, qhov loj dua tag nrho cheeb tsam thaj tsam ntawm cov muab tshuaj txhuam, uas ua rau kom muaj qib siab ntawm oxidation ntawm cov hmoov finer, thiab yog li qhov tshwm sim ntawm cov hlaws dai zoo dua ntxiv.
4. Nqi thiab kev ua ntawm flux
Ntau dhau flux yuav ua rau lub zos vau ntawm cov ham muab tshuaj thiab ua rau cov hlaws dai. Thaum lub flux tsis tuaj yeem ua haujlwm txaus, qhov oxidized tsis tuaj yeem raug tshem tawm tag nrho, uas tseem yuav ua rau cov hlaws dai hauv PCBA kev ua.
5. Lwm yam xav tau kev saib xyuas
Yog hais tias cov ham muab tshuaj tsis kho, txaws yuav tshwm sim thaum lub sij hawm preheating theem ntawm SMT thaj los tsim cov cov hlaws dai. PCBA substrate tau ntxooj, qhov av noo nyob sab hauv tsev yog qhov hnyav dhau, cua ntsawj tawm tsam cov nplaum muab tshuaj, thiab cov muab tshuaj txhuam ntxiv cov thinner ntau dhau, Lub tshuab nplawm lub sijhawm ntev dhau lawm, thiab lwm yam yuav txhawb kev lag luam ntawm cov hlaws dai.
2. Kev tsim thiab qhib ntawm hlau mesh
1. Qhib
Nyob rau hauv cov txheej txheem ntawm kev qhib cov hlau mesh, qhov qhib tau qhib raws li qhov loj me ntawm cov ncoo ncaj qha, yog li ntawd cov ntawv ci ham tuaj yeem luam tawm ntawm cov ntawv ntim solder thaum lub sij hawm solder paste luam ntawv txheej txheem ntawm SMT nti ua, ua rau muaj qhov zoo li ntawm ham hlaws dai.
2. Thickness
Hlau mesh Baidu feem ntau nyob nruab nrab ntawm 0.12 ~ 0.17mm, tuab heev yuav ua rau cov tshuaj txhuam tsis ua hauj lwm, ua rau cov hlaws dai.
3. Mounting siab ntawm lub tshuab tso
Yog hais tias lub siab loj dhau lawm thaum lub caij sib dhos, txoj phuam solder yuav yooj yim nyem rau hauv cov ntawv npog ham hauv qab ntawm cov khoom tiv thaiv. Thaum lub sij hawm reflow soldering, ham muab tshuaj yuav yaj thiab khiav ib ncig tivthaiv rau daim hlaws dai.
4. Teem lub sijhawm ua kom sov cua sov nkhaus
Feem ntau, ham pob yog tsim nyob rau hauv reflow soldering txheej txheem ntawm PCBA ua. Thaum lub sij hawm preheating theem, qhov kub ntawm cov ham muab tshuaj, PCBA thiab nti Cheebtsam nce mus txog ntawm 120 txog 150 ° C. Kev poob siab kub, nyob rau theem no, qhov hloov mus rau hauv cov tshuaj pleev xim pib ua pa, kom qhov me me ntawm cov hmoov hlau cais cais mus rau hauv qab ntawm cov tivthaiv, thiab khiav ib ncig ntawm cov khoom kom tsim cov hlaws dai thaum dej ntws tam sim no.
