Soldering chaw nres tsheb - dab tsi yog vim li cas rau qhov tsis sib xws cua sov ntawm cov hlau lead-dawb reflow soldering
1. Feem ntau, PLCC thiab QFP muaj lub peev xwm ua kom sov ntau dua li cov khoom sib cais, thiab nws nyuaj rau vuam cov cheeb tsam loj dua li cov khoom me me.
2. Nyob rau hauv lub qhov cub uas tsis muaj hmoov lead-dawb reflow, txoj siv conveyor kuj dhau los ua cov cua sov dissipation thaum rov thauj cov khoom rau cov hlau lead-dawb reflow soldering. Tsis tas li ntawd, cov cua kub dissipation tej yam kev mob sib txawv ntawm ntug thiab qhov nruab nrab ntawm cov cua sov qhov chaw, thiab cov ntug kub feem ntau yog tsawg. Ntxiv rau qhov sib txawv ntawm qhov xav tau ntawm qhov kub thiab txias ntawm txhua qhov kub hauv qhov cub, qhov kub ntawm tib qhov chaw thau khoom kuj txawv.
3. Qhov cuam tshuam ntawm cov khoom sib txawv loads. Kev hloov kho ntawm qhov kub thiab txias ntawm cov hlau lead-dawb reflow soldering yuav tsum xav txog qhov zoo rov ua dua nyob rau hauv tsis muaj-load, load thiab sib txawv load yam. Tus nqi thauj khoom yog txhais raws li: LF=L/(L ntxiv rau S); qhov twg L= qhov ntev ntawm qhov sib sau ua ke substrate, thiab S= qhov sib nrug ntawm cov khoom sib dhos.
Txhawm rau kom tau txais txiaj ntsig zoo rov ua dua nyob rau hauv cov txheej txheem tsis muaj cov hlau lead-dawb reflow soldering, qhov loj dua qhov load, qhov nyuaj dua. Feem ntau qhov siab tshaj plaws load ntawm cov hlau lead-dawb reflow qhov cub yog nyob rau hauv thaj tsam ntawm 0.5-0.9. Qhov no yog nyob ntawm cov khoom lag luam (tivthaiv vuam ceev, sib txawv substrates) thiab cov qauv sib txawv ntawm cov rhuab ua kom tawg. Yuav kom tau txais cov txiaj ntsig zoo welding thiab rov ua dua, kev ua tau zoo yog qhov tseem ceeb heev.
