SMT Short Kewayawa Dalilai da Magani

Zaba da sanya injida sauran kayan aikin SMT a cikin samarwa da sarrafa su za su bayyana da yawa munanan al'amura, irin su abin tunawa, gada, walda mai kama-da-wane, walda ta karya, ƙwallon inabi, katakon kwano da sauransu.SMT SMT sarrafa gajeriyar kewayawa ya fi kowa a cikin tazara mai kyau tsakanin fil IC, mafi yawanci a cikin 0.5mm kuma ƙasa da tazara tsakanin fil ɗin IC, saboda ƙaramin tazara, ƙirar samfuri ko bugu mara kyau yana da sauƙi don samar da ɗan tsallakewa.

Dalilai da mafita:

Dalilin 1:Samfurin Stencil

Magani:

Bangon rami na ragar karfe yana da santsi, kuma ana buƙatar magani na lantarki a cikin tsarin samarwa.Buɗe raga ya kamata ya zama 0.01mm ko 0.02mm faɗi fiye da buɗe raga.Buɗewar tana jujjuyawar juzu'i, wanda ke ba da gudummawar fitowar fataccen kwano a ƙarƙashin kwano, kuma yana iya rage lokutan tsaftacewa na farantin raga.

Dalilin 2: solder manna

Magani:

0.5mm da ƙasa da farar IC solder manna ya kamata a zaba a cikin girman 20 ~ 45um, danko a 800 ~ 1200pa.S

Dalilin 3: Solder manna firintabugu

Magani:

1. Nau'in scraper: mai jujjuyawar yana da juzu'in robobi iri biyu da juzu'in karfe.A 0.5 IC bugu ya kamata ya zabi karfe scraper, wanda shi ne conducive zuwa solder manna kafa bayan bugu.

2. Saurin bugawa: manna mai siyar zai mirgina gaba akan samfurin a ƙarƙashin turawar scraper.Gudun bugu mai sauri yana da tasiri ga koma baya na samfuri, amma zai hana yayyowar manna solder;Amma gudun yana da jinkirin sosai, manna mai siyarwar ba zai mirgine akan samfuri ba, yana haifar da ƙarancin ƙuduri na manna solder da aka buga akan kushin solder.Yawancin lokaci, kewayon saurin bugu na tazara mai kyau shine 10 ~ 20mm / s

Yanayin bugu 3: a halin yanzu yanayin bugu na yau da kullun ya kasu zuwa “bugu na lamba” da “bugun da ba na lamba ba”.
Akwai rata tsakanin samfuri da PCB bugu yanayin ne "ba lamba bugu", da janar rata darajar ne 0.5 ~ 1.0mm, da amfani ya dace da daban-daban danko solder manna.

Babu tazara tsakanin samfuri kuma ana kiran bugu na PCB “bugu na lamba”.Yana bukatar da kwanciyar hankali na overall tsarin, dace da bugu high daidaici tin samfuri da PCB don ci gaba da lebur lamba, bayan bugu da PCB rabuwa, don haka wannan hanya don cimma high bugu daidaito, musamman dace da lafiya tazara, matsananci-lafiya. tazara na solder manna bugu.

Dalili 4: Injin SMTtsayi tsayi

Magani:

Domin 0.5mm IC a cikin hawa ya kamata a yi amfani da 0 nesa ko 0 ~ 0.1mm hawa tsawo, domin kauce wa saboda da hawa tsawo ne ma low sabõda haka, solder manna kafa rushewa, sakamakon reflux gajeren kewaye.