Covreflow qhov cubyog siv los solder lub SMT nti Cheebtsam rau lub rooj tsavxwm Circuit Court nyob rau hauv lub SMT txheej txheem soldering khoom siv.Lub qhov cub reflow tso siab rau cov cua kub ntws hauv qhov cub kom txhuam cov tshuaj txhuam rau ntawm cov pob qij txha ntawm cov khoom siv hluav taws xob sib txuas, kom cov tshuaj txhuam muab tshuaj rov ua dua rau hauv cov kua tin kom cov khoom siv SMT chips thiab cov khoom siv hluav taws xob. yog welded thiab welded, thiab ces reflow soldering Lub cub tawg yog txias los tsim cov pob qij txha, thiab cov colloidal solder paste undergoes lub cev cov tshuaj tiv thaiv nyob rau hauv ib tug tej yam kub kub airflow mus cuag cov nyhuv soldering ntawm cov txheej txheem SMT.
Lub soldering nyob rau hauv qhov cub reflow yog muab faib ua plaub txheej txheem.Cov boards nrog smt Cheebtsam yog thauj los ntawm reflow qhov cub qhia rails los ntawm lub preheating cheeb tsam, tshav kub preservation cheeb tsam, soldering cheeb tsam, thiab txias cheeb tsam ntawm lub reflow qhov cub feem, thiab ces tom qab reflow soldering.Plaub qhov chaw kub ntawm lub qhov cub ua kom tiav qhov chaw vuam.Tom ntej no, Guangshengde reflow soldering yuav piav qhia txog cov hauv paus ntsiab lus ntawm plaub qhov chaw kub ntawm lub qhov cub reflow raws li.
Preheating yog ua kom cov kua nplaum nplaum, thiab kom tsis txhob muaj cua sov kub ceev thaum lub sij hawm immersion ntawm tin, uas yog ib qho kev ua cua sov ua rau cov khoom puas.Lub hom phiaj ntawm cheeb tsam no yog kom sov PCB ntawm chav tsev kub kom sai li sai tau, tab sis cov cua kub yuav tsum tau tswj nyob rau hauv ib qho kev tsim nyog.Yog tias nws ceev heev, thermal shock yuav tshwm sim, thiab lub rooj tsav xwm Circuit Court thiab cov khoom yuav puas.Yog tias nws qeeb dhau, cov kuab tshuaj yuav tsis evaporate txaus.Vuam zoo.Vim lub cua sov ceev ceev, qhov sib txawv ntawm qhov kub thiab txias hauv qhov cub reflow yog qhov loj dua nyob rau hauv qhov kawg ntawm qhov kub thiab txias.Txhawm rau tiv thaiv thermal poob siab los ntawm kev puas tsuaj rau cov khoom, qhov siab tshaj plaws cua sov feem ntau yog teev raws li 4 ℃ / S, thiab nce tus nqi feem ntau yog teem rau ntawm 1 ~ 3 ℃ / S.
Lub hom phiaj tseem ceeb ntawm lub tshav kub preservation theem yog kom stabilize qhov kub ntawm txhua yam nyob rau hauv lub reflow rauv thiab txo qhov kub qhov sib txawv.Muab sij hawm txaus nyob rau hauv qhov chaw no los ua kom qhov kub thiab txias ntawm cov khoom loj dua nrog cov khoom me me, thiab xyuas kom meej tias cov flux nyob rau hauv lub solder paste yog tag nrho volatilized.Thaum kawg ntawm qhov kev txuag hluav taws xob, cov oxides ntawm cov ntaub qhwv, cov khoom siv thiab cov pins raug tshem tawm raws li qhov kev txiav txim ntawm cov flux, thiab qhov kub ntawm tag nrho cov Circuit Court board kuj sib npaug.Nws yuav tsum tau muab sau tseg tias tag nrho cov Cheebtsam ntawm SMA yuav tsum muaj qhov kub thiab txias nyob rau hauv qhov kawg ntawm seem no, txwv tsis pub, nkag mus rau hauv reflow seem yuav ua rau ntau yam phem soldering tshwm sim vim qhov kub tsis sib xws ntawm txhua feem.
Thaum lub PCB nkag mus rau hauv cheeb tsam reflow, qhov kub nce sai heev kom cov tshuaj txhuam hniav mus txog lub xeev molten.Lub melting point ntawm cov hlau lead solder paste 63sn37pb yog 183 ° C, thiab lub melting point ntawm cov hlau lead solder paste 96.5Sn3Ag0.5Cu yog 217 ° C.Nyob rau hauv cheeb tsam no, lub rhaub dej kub yog teem rau siab, yog li ntawd qhov kub thiab txias ntawm lub Cheebtsam nce sai sai rau tus nqi kub.Tus nqi kub ntawm qhov reflow nkhaus feem ntau yog txiav txim los ntawm lub melting point kub ntawm lub solder thiab lub tshav kub kuj kub ntawm lub assembled substrate thiab cov khoom.Nyob rau hauv seem reflow, qhov kub ntawm soldering sib txawv nyob ntawm seb lub solder paste siv.Feem ntau, qhov kub ntawm cov hlau lead yog 230-250 ℃, thiab qhov kub ntawm cov hlau lead yog 210-230 ℃.Yog tias qhov kub thiab txias qis dhau, nws yog ib qho yooj yim los tsim cov pob qij txha txias thiab ntub dej tsis txaus;Yog hais tias qhov kub thiab txias heev, coking thiab delamination ntawm epoxy resin substrate thiab yas qhov chaw yuav tshwm sim, thiab ntau eutectic hlau tebchaw yuav tsim, uas yuav ua rau brittle solder pob qij txha, uas yuav cuam tshuam lub vuam lub zog.Nyob rau hauv qhov chaw reflow soldering, xyuam xim tshwj xeeb rau lub sij hawm reflow kom tsis txhob ntev dhau, kom tsis txhob muaj kev puas tsuaj rau lub reflow rauv, nws kuj tseem yuav ua rau cov khoom siv hluav taws xob tsis zoo lossis ua rau lub rooj tsav xwm hluav taws xob hlawv.
Nyob rau theem no, qhov kub thiab txias yog txias rau hauv qab cov khoom theem kub kom solidify cov pob qij txha.Tus nqi cua txias yuav cuam tshuam rau lub zog ntawm kev sib koom ua ke.Yog tias qhov txias txias qeeb dhau lawm, nws yuav ua rau cov khoom siv hlau eutectic ntau dhau los ua, thiab cov khoom lag luam loj tuaj yeem tshwm sim ntawm cov pob qij txha, uas yuav txo lub zog ntawm cov pob qij txha.Qhov ntsuas cua txias hauv thaj chaw txias yog feem ntau txog 4 ℃ / S, thiab qhov cua txias yog 75 ℃.ua tau.
Tom qab txhuam cov tshuaj txhuam thiab mounting smt chip Cheebtsam, lub Circuit Court board yog thauj los ntawm cov kev taw qhia rail ntawm lub reflow soldering rauv, thiab tom qab qhov kev txiav txim ntawm plaub qhov kub thiab txias cheeb tsam saum lub reflow soldering rauv, ib tug tiav soldered Circuit Court board yog tsim.Qhov no yog tag nrho cov ntsiab lus ua haujlwm ntawm lub qhov cub reflow.
Post lub sij hawm: Jul-29-2020