(1) Ka'idarreflow soldering
Saboda ci gaba da miniaturization na lantarki samfurin PCB allon, guntu aka gyara sun bayyana, da kuma gargajiya waldi hanyoyin sun kasa biyan bukatun.Ana amfani da reflow soldering a cikin taro na matasan hadedde allon allon, kuma mafi yawan abubuwan da aka haɗa da walda su ne guntu capacitors, guntu inductor, saka transistor da diodes.Tare da haɓakar fasahar SMT gaba ɗaya ta zama cikakke, fitowar nau'ikan abubuwan haɗin guntu (SMC) da na'urori masu hawa (SMD), fasahar sarrafa reflow da kayan aikin a matsayin wani ɓangare na fasahar hawan haɓakawa kuma an haɓaka su daidai. , kuma aikace-aikacen su suna ƙara yawa.An yi amfani da shi a kusan dukkanin filayen samfurin lantarki.Reflow soldering ne mai taushi solder cewa gane da inji da lantarki dangane tsakanin solder iyakar surface mounted aka gyara ko fil da kuma buga allon gammaye ta remelting da manna da aka ɗora da solder da aka riga-raba a kan buga allon gammaye.walda.Sake-sayar da siyar da aka yi shi ne don siyar da abubuwan da aka gyara zuwa allon PCB, kuma reflow soldering shine don hawa na'urori a saman.Reflow soldering ya dogara da aikin iska mai zafi a kan gidajen abinci, kuma jelly-kamar jujjuyawar yana jurewa ta jiki a ƙarƙashin wani yanayin zafin iska mai zafi don cimma nasarar siyarwar SMD;don haka ana kiransa "reflow soldering" saboda iskar gas yana yawo a cikin injin walda don samar da zafi mai zafi don cimma manufar sayar da kayan..
(2) Ka'idar tareflow solderingna'ura ta kasu kashi-kashi da yawa:
A. Lokacin da PCB ya shiga yankin dumama, sauran ƙarfi da iskar gas a cikin manna solder suna ƙafe.A lokaci guda, jujjuyawar da ke cikin ƙwanƙolin mai yana jika pads, tashoshi da filaye, sai manna mai siyar ya yi laushi, ya faɗi, ya rufe manna mai siyar.farantin don ware pads da fitilun sassa daga oxygen.
B. Lokacin da PCB ya shiga wurin adana zafi, PCB da abubuwan da aka gyara suna da cikakken preheated don hana PCB daga shiga babban yanayin zafin jiki na walda da lalata PCB da abubuwan haɗin gwiwa.
C. Lokacin da PCB ya shiga wurin waldawa, zafin jiki yana tashi da sauri ta yadda manna mai siyar ya kai ga narkakkar yanayi, kuma ruwan solder ɗin ya jika, yaɗawa, yaɗawa, ko kuma ya sake malalowa ga pads, ƙarshen sassan da fil na PCB don samar da haɗin gwiwar solder. .
D. PCB yana shiga yankin sanyaya don ƙarfafa haɗin gwiwar solder;lokacin da aka kammala sayar da reflow.
(3) Tsarin buƙatun donreflow solderinginji
Fasaha mai sake kwarara ba sabon abu bane a fagen masana'antar lantarki.Abubuwan da ke cikin alluna daban-daban da ake amfani da su a cikin kwamfutocinmu ana sayar da su zuwa allon da'ira ta wannan tsari.Abubuwan da ke cikin wannan tsari shine cewa zafin jiki yana da sauƙin sarrafawa, ana iya kaucewa oxidation a lokacin tsarin sayar da kayayyaki, kuma farashin masana'anta ya fi sauƙi don sarrafawa.Akwai na’urar dumama a cikin wannan na’ura, wacce ke dumama iskar iskar nitrogen zuwa madaidaicin zafin jiki sannan ta busa ta zuwa allon da’irar da aka makala sinadaran, ta yadda za a narkar da solder na bangarorin biyu sannan a hade shi da motherboard. .
1. Saita bayanin martaba mai ma'ana mai ma'ana mai sake jujjuyawar yanayin zafin jiki kuma yi gwajin bayanin martaba na ainihin lokacin akai-akai.
2. Weld bisa ga walƙiya shugabanci na PCB zane.
3. Tsananin hana bel na jigilar kaya daga girgiza yayin aikin walda.
4. Dole ne a duba tasirin walda na allo da aka buga.
5. Ko waldi ya ishe, ko surface na solder hadin gwiwa ne santsi, ko siffar solder hadin gwiwa ne rabin wata, halin da ake ciki na solder bukukuwa da sauran, halin da ake ciki na ci gaba waldi da kama-da-wane waldi.Hakanan duba canjin launi na PCB da sauransu.Kuma daidaita yanayin zafin jiki bisa ga sakamakon dubawa.Ya kamata a duba ingancin walda akai-akai a duk lokacin aikin samarwa.
(4) Abubuwan da ke shafar tsarin sake kwarara:
1. Yawancin lokaci PLCC da QFP suna da ƙarfin zafi mafi girma fiye da abubuwan haɗin guntu masu hankali, kuma yana da wuyar walda manyan sassa fiye da ƙananan sassa.
2. A cikin tanda mai sake juyawa, bel ɗin mai ɗaukar nauyi shima ya zama tsarin ɓarkewar zafi lokacin da samfuran da aka kai ana sake kwarara akai-akai.Bugu da ƙari, yanayin zafi na zafi a gefen da tsakiyar ɓangaren dumama sun bambanta, kuma yawan zafin jiki a gefen yana da ƙananan.Bugu da ƙari ga buƙatun daban-daban, yanayin zafin jiki ɗaya kuma ya bambanta.
3. Tasirin nauyin kaya daban-daban.Daidaita bayanin martabar zafin jiki na reflow soldering ya kamata a yi la'akari da cewa ana iya samun maimaitawa mai kyau a ƙarƙashin ƙarancin kaya, kaya da abubuwan nauyi daban-daban.An ayyana ma'aunin nauyi kamar: LF=L/(L+S);inda L=tsawon ɗigon da aka haɗa da S=tazarar tazarar da aka haɗa.Mafi girman ma'aunin nauyi, yana da wahala a sami sakamakon da za a iya maimaitawa don tsarin sake gudana.Yawanci matsakaicin nauyin nauyin tanda na sake dawowa yana cikin kewayon 0.5 ~ 0.9.Wannan ya dogara da halin da ake ciki na samfur (bangaren soldering yawa, daban-daban substrates) da daban-daban model na reflow tanderu.Kwarewar aiki yana da mahimmanci don samun sakamako mai kyau na walda da maimaitawa.
(5) Menene fa'idarsareflow solderingfasahar injin?
1) Lokacin siyarwa tare da fasahar siyarwar reflow, babu buƙatar nutsar da allon da'irar a cikin narkakken solder, amma ana amfani da dumama gida don kammala aikin siyarwar;don haka, abubuwan da za a siyar da su suna da ɗan girgiza zafi kuma ba za su haifar da lalacewa ta hanyar wuce gona da iri ba.
2) Tun da fasahar walda kawai tana buƙatar shafa solder a ɓangaren walda kuma a ɗora shi a cikin gida don kammala walda, ana guje wa lahanin walda kamar haɗakarwa.
3) A cikin fasahar fasahar reflow na siyarwar, ana amfani da mai siyar sau ɗaya kawai, kuma babu sake amfani da ita, don haka mai siyar yana da tsabta kuma ba ta da ƙazanta, wanda ke tabbatar da ingancin haɗin ginin.
(6) Gabatarwa ga tsarin gudana nareflow solderinginji
Tsarin sayar da reflow shine allon dutsen ƙasa, kuma tsarinsa ya fi rikitarwa, wanda za'a iya raba shi zuwa nau'i biyu: hawa mai gefe guda da hawa mai gefe biyu.
A, hawa mai gefe guda: pre-shafi solder manna → faci (kasu kashi cikin manual hawa da inji atomatik hawa) → reflow soldering → dubawa da lantarki gwajin.
B, Hauwa mai gefe biyu: Manna kayan kwalliyar riga-kafi a gefe → SMT (kasuwa zuwa jeri na hannu da sanya injin atomatik) ) sanyawa) → reflow soldering → dubawa da gwajin lantarki.
The sauki tsari na reflow soldering shine "allon bugu solder manna - patch - reflow soldering, ainihin abin da shi ne daidaito na siliki allo bugu, da yawan amfanin ƙasa kudi ne m da PPM na inji don faci soldering, da reflow soldering ne. don sarrafa yanayin zafi da zafi mai zafi.da kuma raguwar yanayin zafi.”
(7) Reflow soldering inji kayan aikin kiyaye tsarin
Ayyukan kulawa da dole ne mu yi bayan an yi amfani da sayar da reflow;in ba haka ba, yana da wuya a kula da rayuwar sabis na kayan aiki.
1. A rika duba kowace sashe a kullum, sannan a ba da kulawa ta musamman ga bel din abin daukar kaya, ta yadda ba za a iya makale ko fadowa ba.
2 Lokacin overhailing na'ura, ya kamata a kashe wutar lantarki don hana girgiza wutar lantarki ko gajeriyar kewayawa.
3. Dole ne injin ya kasance mai ƙarfi kuma ba mai karkata ba ko maras tabbas
4. A cikin yanayin kowane yanki na zafin jiki wanda ke dakatar da dumama, da farko a duba cewa an riga an rarraba fis ɗin daidai zuwa kushin PCB ta remelting man.
(8) Tsare-tsare don na'urar siyar da sake kwarara
1. Don tabbatar da amincin mutum, dole ne ma'aikaci ya cire lakabin da kayan ado, kuma hannayen riga kada su kasance masu kwance.
2 Kula da yawan zafin jiki yayin aiki don guje wa ƙona wuta
3. Kada ka saita yanayin zafin jiki da saurireflow soldering
4. Tabbatar cewa dakin yana da iska, kuma mai fitar da hayaki ya kamata ya kai ga waje na taga.
Lokacin aikawa: Satumba-07-2022