Reflow Soldering txheej txheem
Reflow soldering yog ib qho ntawm cov txheej txheem tseem ceeb ntawm kev sib dhos heatsink. Reflow soldering feem ntau yog siv los welding cov thermal qhov chaw, yaj lub solder paste los ntawm cua sov los welding qhov chaw ua ke, thiab ces txias lub solder muab tshuaj txhuam los ntawm txias ntawm reflow soldering kom solidify lub Cheebtsam thiab solder paste ua ke. Reflow furnace yog ib daim ntawv thov dav heev tam sim no, uas yog siv los ntawm cov tuam ntxhab feem ntau. Txhawm rau nkag siab txog kev siv vuam reflow, peb yuav tsum xub nkag siab txog cov txheej txheem SMT. Tau kawg, feem ntau hais lus, nws yog welding, tab sis reflow vuam muab qhov tsim nyog kub, uas yog, qhov kub thiab txias nkhaus.
Vim li cas thiaj hu ua reflow soldering:
Keeb kwm, cov tshuaj txhuam hniav yog tov nrog qee cov tshuaj xws li hlau tin hmoov thiab flux, tab sis cov tin hauv nws tuaj yeem hais tias muaj nyob ntawm nws tus kheej li cov hlaws me me. Tom qab dhau los ntawm cov khoom siv xws li reflow rauv, tom qab ob peb qhov chaw kub thiab txias sib txawv, thaum qhov kub siab tshaj 217 degree, cov hlaws me me yuav yaj. Los ntawm cov catalysis ntawm flux thiab lwm yam khoom, suav tsis txheeb cov khoom me me yuav yaj mus rau hauv ib qho, Hauv lwm lo lus, cov khoom me me rov qab mus rau cov kua dej ntws. Cov txheej txheem no feem ntau hu ua reflux, uas txhais tau hais tias cov tin hmoov rov qab mus rau cov kua hauv lub xeev los ntawm cov khoom qub dhau los, thiab tom qab ntawd rov qab mus rau lub xeev cov khoom ntawm qhov chaw txias.
kub nkhaus:
Temperature curve yog hais txog qhov nkhaus uas qhov kub ntawm ib qho chaw ntawm lub radiator hloov nrog lub sij hawm thaum lub radiator dhau los ntawm lub qhov cub. Qhov ntsuas kub nkhaus muab txoj hauv kev yooj yim los txheeb xyuas qhov hloov pauv ntawm qhov ntsuas kub ntawm cov khoom hauv tag nrho cov txheej txheem reflow. Qhov no yog qhov tseem ceeb heev kom tau txais qhov zoo tshaj plaws weldability, zam kev puas tsuaj rau cov khoom vim overtemperature, thiab ua kom cov vuam zoo.
Qhov zoo:
1. Thaum vuam nrog ntws vuam tshuab, cov khoom tsis tas yuav tsum tau muab tso rau hauv molten solder, tab sis cov cua sov hauv zos yog siv los ua kom tiav cov haujlwm vuam; Yog li ntawd, welded Cheebtsam yog raug rau me me thermal shock thiab yuav tsis puas vim overheating.
2. Vim hais tias cov cuab yeej siv tshuab tsuas yog yuav tsum tau muab cov vuam vuam ntawm qhov chaw vuam thiab ua tiav cov vuam los ntawm cov cua sov hauv zos, cov vuam tsis xws li kev sib txuas yog zam.
3. Nyob rau hauv reflow soldering technology, lub solder tsuas yog siv ib zaug, thiab tsis muaj rov qab siv dua. Yog li ntawd, lub solder yog heev huv si thiab tsis muaj impurities, uas ua kom cov zoo ntawm cov pob qij txha.
