Chengyuan reflow soldering kub cheeb tsam yog feem ntau muab faib ua plaub qhov chaw kub: preheating cheeb tsam, qhov kub thiab txias cheeb tsam, soldering cheeb tsam, thiab txias cheeb tsam.
1. Preheating cheeb tsam
Preheating yog thawj theem ntawm cov txheej txheem reflow soldering.Thaum lub sij hawm no reflow theem, tag nrho cov Circuit Court board los ua ke yog tsis tu ncua rhuab mus rau lub hom phiaj kub.Lub hom phiaj tseem ceeb ntawm theem preheat yog coj tag nrho lub rooj sib txoos kom muaj kev nyab xeeb mus rau qhov kub thiab txias ua ntej.Preheating kuj yog ib lub sijhawm los degas cov kuab tshuaj volatile hauv cov tshuaj txhuam hniav.Txhawm rau kom cov kuab tshuaj pasty ntws tawm kom zoo thiab kev sib dhos kom nyab xeeb mus txog qhov kub thiab txias ua ntej, PCB yuav tsum tau muab tso rau hauv ib qho zoo sib xws, linear zam.Qhov taw qhia tseem ceeb ntawm thawj theem ntawm cov txheej txheem reflow yog qhov kub thiab txias ntawm qhov ntsuas kub ntawm lub sijhawm.Qhov no feem ntau yog ntsuas hauv degrees Celsius ib ob C / s.Muaj ntau qhov sib txawv tuaj yeem cuam tshuam rau daim duab no, suav nrog: lub sijhawm ua lub hom phiaj, solder paste volatility, thiab cov kev xav ntawm cov khoom.Nws yog ib qho tseem ceeb uas yuav tau xav txog tag nrho cov txheej txheem no hloov pauv, tab sis feem ntau qhov kev txiav txim siab ntawm cov khoom rhiab heev yog qhov tseem ceeb.“Muaj ntau yam khoom yuav tawg yog tias qhov kub thiab txias hloov sai heev.Qhov siab tshaj plaws ntawm kev hloov thermal uas cov khoom rhiab tshaj plaws tuaj yeem tiv taus dhau los ua qhov siab tshaj plaws qhov siab. "Txawm li cas los xij, txoj kab nqes tuaj yeem hloov kho kom txhim kho lub sijhawm ua haujlwm yog tias tsis siv thermally rhiab thiab ua kom cov khoom siv ntau tshaj.Yog li ntawd, ntau lub tuam txhab nce cov nqes hav mus rau qhov siab tshaj plaws universal tso cai tus nqi ntawm 3.0 ° C / sec.Hloov pauv, yog tias koj siv cov tshuaj txhuam hniav uas muaj cov kuab tshuaj muaj zog tshwj xeeb, cua sov cov khoom siv tau yooj yim tuaj yeem tsim cov txheej txheem khiav tawm.Raws li volatile solvents outgas, lawv yuav txaws solder los ntawm cov ntaub qhwv thiab boards.Solder pob yog qhov teeb meem tseem ceeb rau kev tawm tsam hnyav thaum lub sijhawm sov so.Thaum lub rooj tsavxwm raug coj mus rau qhov kub thiab txias thaum lub sij hawm preheat, nws yuav tsum nkag mus rau qhov kub thiab txias theem los yog pre-reflow theem.
2. Qhov kub thiab txias tsis tu ncua
Qhov ntsuas kub tsis tu ncua yog feem ntau yog 60 mus rau 120 thib ob raug rau kev tshem tawm cov nplaum nplaum nplaum thiab ua kom cov flux, qhov twg cov pab pawg flux pib redox ntawm cov khoom siv thiab cov ntaub qhwv.Cov kub ntau dhau tuaj yeem ua rau tawg lossis tawg ntawm cov khoom siv thiab oxidation ntawm cov nplaum nplaum txuas nrog cov ntaub qhwv thiab cov terminals.Tsis tas li ntawd, yog tias qhov kub thiab txias qis dhau, qhov flux yuav tsis ua kom tag nrho.
3. Vuam cheeb tsam
Qhov kub siab tshaj plaws yog 20-40 ° C saum cov kua dej.[1] Qhov kev txwv no yog txiav txim siab los ntawm ib feem nrog qhov qis tshaj qhov kub thiab txias tsis kam (qhov feem ntau cuam tshuam rau cov cua sov puas) ntawm lub rooj sib txoos.Cov txheej txheem txheej txheem yog rho tawm 5 ° C los ntawm qhov kub siab tshaj plaws ntawm cov khoom siv zoo tshaj plaws tuaj yeem tiv taus kom txog rau qhov siab tshaj plaws txheej txheem.Nws yog ib qho tseem ceeb uas yuav tau saib xyuas cov txheej txheem kub kom tsis txhob dhau qhov kev txwv no.Tsis tas li ntawd, qhov kub thiab txias (tshaj 260 ° C) tuaj yeem ua rau cov chips sab hauv ntawm SMT cov khoom thiab txhawb kev loj hlob ntawm intermetallic compounds.Hloov pauv, qhov kub uas tsis kub txaus yuav tiv thaiv cov slurry los ntawm reflowing txaus.
4. Qhov chaw txias
Qhov kawg cheeb tsam yog ib qho chaw txias kom maj mam txias cov txheej txheem txheej txheem thiab solidify cov pob qij txha.Kev txias kom zoo suppresses pliaj intermetallic compound tsim los yog thermal shock rau cov khoom.Qhov ntsuas kub nyob rau hauv qhov chaw txias yog li ntawm 30-100 ° C.Qhov cua txias ntawm 4 ° C / s feem ntau pom zoo.Qhov no yog qhov parameter los txiav txim siab thaum txheeb xyuas cov txiaj ntsig ntawm cov txheej txheem.
Yog xav paub ntxiv txog kev siv tshuab reflow soldering, thov saib lwm cov khoom ntawm Chengyuan Industrial Automation Equipment
Post lub sij hawm: Jun-09-2023