BGA walda, sanya a sauƙaƙe wani yanki ne na manna tare da abubuwan BGA na allon kewayawa, ta hanyarreflow tandatsari don cimma waldi.Lokacin da aka gyara BGA, BGA kuma ana yin walda da hannu, sannan kuma BGA ana rarrabuwa da walda ta tebur ɗin gyaran BGA da sauran kayan aikin.
Dangane da yanayin yanayin zafi,reflow soldering injiZa a iya raba kusan kashi huɗu: yankin preheating, yankin adana zafi, yankin reflow da yankin sanyaya.
1. Yankin preheating
Hakanan an san shi da yankin ramp, ana amfani da shi don ɗaga zafin PCB daga yanayin zafi zuwa zafin da ake so.A wannan yanki, allon kewayawa da abin da ke ciki suna da ƙarfin zafi daban-daban, kuma ainihin ƙimar zafin su ya bambanta.
2. Yankin rufewa na thermal
Wani lokaci ana kiran yankin bushe ko rigar, wannan yanki gabaɗaya yana ɗaukar kashi 30 zuwa 50 na yankin dumama.Babban manufar yanki mai aiki shine daidaita yanayin zafin abubuwan abubuwan akan PCB kuma rage bambance-bambancen zafin jiki.Bada isasshen lokaci a wannan yanki don ɓangaren ƙarfin zafi don cim ma zafin ƙarami kuma don tabbatar da cewa juzu'i a cikin manna mai siyarwa ya cika.A ƙarshen yanki mai aiki, ana cire oxides akan pads, ƙwallan siyar, da fil ɗin abubuwan, kuma zafin jiki duka yana daidaitawa.Ya kamata a lura cewa duk abubuwan da ke cikin PCB yakamata su kasance da zafin jiki iri ɗaya a ƙarshen wannan yanki, in ba haka ba shigar da yankin reflux zai haifar da mummunan al'amuran walda daban-daban saboda rashin daidaituwar zafin jiki na kowane sashi.
3. Yankin Reflux
Wani lokaci ana kiransa kololuwa ko yankin dumama na ƙarshe, ana amfani da wannan yanki don ɗaga zafin PCB daga zafin zafin da aka ba da shawarar.Zazzabi mai aiki koyaushe yana ɗan ƙasa kaɗan fiye da wurin narkewa na gami, kuma mafi girman zafin jiki koyaushe yana kan wurin narkewa.Tsayar da zafin jiki a cikin wannan yanki da yawa zai haifar da gangaren zafin jiki ya wuce 2 ~ 5 ℃ a sakan daya, ko kuma sanya mafi girman zafin jiki na reflux sama da shawarar da aka ba da shawarar, ko yin tsayin daka na iya haifar da gurɓataccen gurɓataccen abu, delamination ko ƙonewar PCB, kuma yana lalata amincin abubuwan abubuwan.Matsakaicin zafin jiki na reflux yana ƙasa da shawarar da aka ba da shawarar, kuma walƙiya mai sanyi da sauran lahani na iya faruwa idan lokacin aiki ya yi gajere.
4. Yankin sanyaya
Foda tin alloy na man narke a cikin wannan yanki ya narke kuma ya cika saman da za a haɗa shi kuma ya kamata a sanyaya shi da sauri don sauƙaƙe samuwar lu'ulu'u, haɗin gwiwa mai haske, siffar mai kyau da ƙananan lamba. .Sanyi sannu a hankali yana haifar da dattin allo don karyewa cikin kwano, wanda ke haifar da maras kyau, guraben solder.A cikin matsanancin yanayi, yana iya haifar da mannewar kwano mara kyau da raunin haɗin gwiwa na solder.
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:
Zhejiang NeoDen Technology Co., Ltd
Imel:info@neodentech.com
Lokacin aikawa: Afrilu-20-2021