Maimaita ilimin tanda mai alaƙa
Ana amfani da reflow soldering don taron SMT, wanda shine maɓalli na tsarin SMT.Ayyukansa shine narkar da manna mai siyar, sanya abubuwan haɗin ginin ƙasa da PCB da tabbaci sun haɗa juna.Idan ba za a iya sarrafa shi da kyau ba, zai yi mummunar tasiri akan aminci da rayuwar sabis na samfuran.Akwai hanyoyi da yawa na reflow waldi.Hanyoyin da suka shahara a baya sune infrared da gas-phase.Yanzu da yawa masana'antun amfani da zafi iska reflow waldi, da kuma wasu ci-gaba ko musamman lokatai amfani da reflow hanyoyin, kamar zafi core farantin, farin haske mayar da hankali, a tsaye tanda, da dai sauransu Wadannan za su yi wani taƙaitaccen gabatarwar ga rare zafi iska reflow waldi.
1. Zafafan iska reflow waldi
Yanzu, galibin sabbin tankunan sayar da wutar lantarki ana kiransu tilastawa convection hot iska reflow soldering tanders.Yana amfani da fanka na ciki don busa iska mai zafi zuwa ko kusa da farantin taron.Ɗaya daga cikin fa'idodin wannan tanderun shine cewa a hankali yana ba da zafi ga farantin taro, ba tare da la'akari da launi da nau'in sassan ba.Ko da yake, saboda daban-daban kauri da kuma sassa yawa, zafi sha na iya zama daban-daban, amma tilasta convection tanderu sannu a hankali zafi sama, da kuma zafin jiki bambanci a kan PCB daya ba daban-daban.Bugu da kari, tanderun na iya tsananin sarrafa madaidaicin zafin jiki da ƙimar zafin yanayin yanayin da aka ba da shi, wanda ke ba da mafi kyawun yanki zuwa kwanciyar hankali da tsarin reflux mafi sarrafawa.
2. Rarraba yanayin zafi da ayyuka
A cikin aiwatar da walƙiya mai zafi na iska mai zafi, manna solder ɗin yana buƙatar shiga cikin matakai masu zuwa: volatilization mai ƙarfi;juyi kawar da oxide a kan farfajiyar walda;solder manna narkewa, reflow da solder manna sanyaya, da solidification.Yanayin zafin jiki na yau da kullun (Profile: yana nufin lanƙwasa cewa zazzabi na haɗin gwiwa mai siyarwa akan PCB yana canzawa tare da lokaci lokacin wucewa ta cikin tanderun da aka sake fitarwa) zuwa yankin preheating, wurin adana zafi, wurin sake fitarwa, da wurin sanyaya.(duba sama)
① Preheating yankin: manufar preheating yankin ne preheat PCB da aka gyara, cimma daidaito, da kuma cire ruwa da sauran ƙarfi a solder manna, don hana solder manna rushewa da solder spatter.Za a sarrafa ƙimar hawan zafin jiki a cikin kewayon da ya dace (sauri da sauri zai haifar da girgizar zafi, kamar fashewar capacitor yumbu mai yawa, splashing na solder, kafa ƙwallayen solder da haɗin gwiwa tare da ƙarancin solder a cikin yankin da ba a welded na duka PCB ba. ; jinkirin da yawa zai raunana aikin juzu'i).Gabaɗaya, matsakaicin ƙimar hauhawar zafin jiki shine 4 ℃ / sec, kuma an saita ƙimar haɓaka azaman 1-3 ℃ / sec, wanda shine ma'aunin ECs bai wuce 3 ℃ / sec.
② Yankin kiyaye zafi (aiki): yana nufin yankin daga 120 ℃ zuwa 160 ℃.Babban maƙasudin shine don sanya zafin jiki na kowane sashi akan PCB ya zama iri ɗaya, rage bambance-bambancen zafin jiki gwargwadon yuwuwar, da kuma tabbatar da cewa mai siyar zai iya bushe gaba ɗaya kafin a kai ga zazzabi mai sake gudana.A ƙarshen wurin rufewa, za a cire oxide akan kushin solder, ƙwallon ƙwallon solder, da fil ɗin abubuwan, kuma za'a daidaita zafin jiki na dukkan allon kewayawa.Lokacin sarrafawa shine kusan 60-120 seconds, dangane da yanayin mai siyarwar.ECS misali: 140-170 ℃, max120sec;
③ Yanki mai sake kwarara: an saita zafin zafin na'urar dumama a wannan yanki a matakin mafi girma.Matsakaicin zafin jiki na walda ya dogara da manna solder da aka yi amfani da shi.Ana ba da shawarar gabaɗaya don ƙara 20-40 ℃ zuwa zafin zafin narkewar solder manna.A wannan lokacin, mai siyar da ke cikin manna mai siyar ya fara narkewa kuma ya sake gudana, yana maye gurbin ruwa don jika kushin da abubuwan da aka gyara.Wani lokaci, yankin kuma ya kasu zuwa yankuna biyu: yankin narkewa da yankin sake kwarara.Madaidaicin yanayin zafin jiki shine yankin da "yankin tip" ya rufe bayan wurin narkewa na solder shine mafi ƙanƙanci kuma mai daidaitawa, gabaɗaya, kewayon lokacin sama da 200 ℃ shine 30-40 sec.Ma'auni na ECS shine kololuwar zafin jiki: 210-220 ℃, kewayon lokaci akan 200 ℃: 40 ± 3sec;
④ Yanki mai sanyaya: sanyaya da sauri kamar yadda zai yiwu zai taimaka don samun haɗin gwiwar solder mai haske tare da cikakken siffar da ƙananan kusurwar lamba.Sanyi sannu a hankali zai haifar da ƙarin bazuwar kushin cikin gwangwani, wanda zai haifar da haɗin gwiwa mai launin toka da ƙaƙƙarfan solder, har ma yana haifar da mummunan tabo da raunin solder haɗin gwiwa.Yawan sanyaya gabaɗaya yana cikin – 4 ℃ / s, kuma ana iya sanyaya shi zuwa kusan 75 ℃.Gabaɗaya, ana buƙatar sanyaya tilas ta fanti mai sanyaya.
3. Daban-daban dalilai shafi aikin walda
Abubuwan fasaha
Hanyar pretreatment walda, nau'in magani, hanya, kauri, adadin yadudduka.Ko yana da zafi, yanke ko sarrafa ta wasu hanyoyi a lokacin daga magani zuwa walda.
Zane na walda tsari
Welding area: yana nufin girman, rata, rata jagora bel (waya): siffar, thermal watsin, da zafi damar da welded abu: yana nufin waldi shugabanci, matsayi, matsa lamba, bonding jihar, da dai sauransu
Yanayin walda
Yana nufin zafin walda da lokaci, yanayin zafin jiki, dumama, saurin sanyaya, yanayin dumama walda, nau'in jigilar zafi (tsawon tsayi, saurin tafiyar zafi, da sauransu)
kayan walda
Flux: abun da ke ciki, maida hankali, aiki, wurin narkewa, wurin tafasa, da dai sauransu
Solder: abun da ke ciki, tsarin, abun ciki na ƙazanta, wurin narkewa, da dai sauransu
Base karfe: abun da ke ciki, tsarin da thermal watsin na tushe karfe
Danko, takamaiman nauyi da thixotropic Properties na solder manna
Substrate abu, nau'in, cladding karfe, da dai sauransu.
Labari da hotuna daga intanet, idan wani cin zarafi pls da farko tuntube mu don sharewa.
NeoDen yana ba da cikakkiyar mafita na layin taro na SMT, gami da tanda na sake kwarara SMT, injin siyar da igiyar ruwa, na'ura mai ɗaukar hoto da wuri, firintar manna mai siyarwa, mai ɗaukar PCB, mai saukar da PCB, mai ɗaukar guntu, injin SMT AOI, injin SMT SPI, injin SMT X-Ray, SMT taron layin kayan aiki, PCB samar da kayan SMT kayayyakin gyara, da dai sauransu kowane irin SMT inji za ka iya bukatar, da fatan za a tuntube mu don ƙarin bayani:
Hangzhou NeoDen Technology Co., Ltd
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Lokacin aikawa: Mayu-28-2020