Na'urar bugu da manna solder kayan aiki ne mai mahimmanci a sashin gaba na layin SMT, galibi ta amfani da stencil don buga manna solder akan kushin da aka kayyade, bugu mai kyau ko mara kyau na bugu na solder, kai tsaye yana shafar ingancin solder na ƙarshe.Abubuwan da ke biyowa don bayyana ilimin fasaha na saitunan tsarin tsarin bugu.
1. Matsin matsi.
Ya kamata matsa lamba squeegee ya dogara ne akan ainihin buƙatun samfurin samarwa.Matsi yana da ƙananan ƙananan, za'a iya samun yanayi guda biyu: squeegee a cikin tsarin ci gaba da karfin ƙasa kuma kadan ne, zai haifar da zubar da adadin ƙarancin bugu;na biyu, squeegee ba ya kusa da saman stencil, bugawa saboda kasancewar ɗan ƙaramin rata tsakanin squeegee da PCB, yana ƙara kauri na bugawa.Bugu da kari, da squeegee matsa lamba ne ma kananan zai sa stencil surface barin Layer na solder manna, da sauki haifar da graphics sticking da sauran bugu lahani.A akasin wannan, da squeegee matsa lamba ne ma girma zai sauƙi kai ga solder manna bugu ne ma bakin ciki, kuma ko da lalata stencil.
2. Scraper kwana.
Scraper kwana ne kullum 45 ° ~ 60 °, solder manna tare da mai kyau mirgina.Girman kusurwa na scraper yana rinjayar girman ƙarfin tsaye na ƙwanƙwasa a kan manna mai sayarwa, ƙananan kusurwa, mafi girma a tsaye karfi.Ta hanyar canza kusurwar scraper zai iya canza matsa lamba da aka haifar da scraper.
3. Taurin kai
Har ila yau, taurin squeegee zai shafi kauri na manna bugu.Mai laushi mai laushi zai kai ga manna mai siyar, don haka yakamata a yi amfani da matsi mai tsauri ko matsi mai ƙarfe, gabaɗaya ta amfani da mashin ƙarfe.
4. Gudun bugawa
Ana saita saurin bugawa gabaɗaya zuwa 15 ~ 100 mm / s.Idan gudun ya yi yawa a hankali, danko mai solder yana da girma, ba shi da sauƙi a rasa bugu, kuma yana rinjayar ingancin bugawa.Gudun yana da sauri sosai, squeegee ta hanyar buɗe lokacin samfuri ya yi guntu, manna solder ba za a iya shiga cikin buɗewa gabaɗaya ba, mai sauƙin haifar da manna solder bai cika ko zubar lahani ba.
5. Buga tazarar
Buga tazarar yana nufin nisa tsakanin saman ƙasa na stencil da saman PCB, ana iya raba bugu na stencil zuwa lamba da bugu marasa lamba iri biyu.Buga Stencil tare da rata tsakanin PCB ana kiransa bugu mara lamba, babban rata na 0 ~ 1.27mm, babu hanyar buga bugu da ake kira bugu lamba.Tuntuɓi bugu a tsaye na iya sanya ingancin bugun da Z ya shafi ƙarami, musamman don ingantaccen bugu mai solder.Idan kaurin stencil ya dace, ana amfani da bugu na lamba gaba ɗaya.
6. Saurin sakin
Lokacin da squeegee ya kammala bugun bugun bugun, saurin stencil da ke barin PCB ana kiransa saurin kashewa.Daidaitawar saurin sakin da ya dace, ta yadda stencil ɗin ya bar PCB lokacin da ɗan gajeren tsari ya kasance, ta yadda za a fitar da manna daga wuraren buɗewar stencil gabaɗaya (demolded), don samun Z mafi kyawun kayan kwalliyar manna.Gudun rabuwa na PCB da stencil zasu sami tasiri mafi girma akan tasirin bugu.The demoulding lokaci ya yi tsayi da yawa, mai sauƙi zuwa kasa na stencil saura solder manna;Demulding lokaci ne ma gajere, ba conducive zuwa madaidaiciya solder manna, shafi ta tsabta.
7. Stencil tsaftacewa mita
Tsabtace stencil wani abu ne don tabbatar da ingancin bugu, tsaftace ƙasa na stencil a cikin aikin bugawa don kawar da datti a ƙasa, wanda ke taimakawa wajen hana kamuwa da PCB.Ana yin tsaftacewa yawanci tare da anhydrous ethanol azaman maganin tsaftacewa.Idan akwai saura solder manna a cikin bude na stencil kafin samar, shi dole ne a tsabtace kafin amfani, da kuma tabbatar da cewa babu wani tsaftacewa bayani da ya rage, in ba haka ba zai shafi soldering na solder manna.Gabaɗaya an ƙulla cewa stencil dole ne a tsaftace shi da hannu tare da goge takarda a kowane minti 30, kuma dole ne a tsaftace stencil tare da ultrasonic da barasa bayan samarwa don tabbatar da cewa babu ragowar manna a cikin buɗaɗɗen stencil.
Lokacin aikawa: Dec-09-2021