Solder paste kudhinda muchina chinhu chakakosha midziyo iri pamberi pechikamu cheSMT mutsara, kunyanya kushandisa stencil kudhinda solder paste pane yakatarwa padhi, iyo yakanaka kana yakaipa solder paste kudhinda, inokanganisa zvakananga yekupedzisira solder mhando.Izvi zvinotevera kutsanangura ruzivo rwehunyanzvi rwemichina yekudhinda process parameters marongero.
1. Squeegee pressure.
Iyo squeegee pressure inofanirwa kuve yakavakirwa pane chaiyo kugadzirwa chigadzirwa zvinodiwa.Kudzvinyirira kwakanyanya kuduku, panogona kunge kune mamiriro maviri: squeegee mukugadzirisa kufambira mberi kwesimba rinodzika zvakare diki, richakonzera kubuda kwehuwandu hwekusakwana kudhinda;chechipiri, iyo squeegee haisi pedyo nechepamusoro pe stencil, kudhinda nekuda kwekuvapo kwekapu kadiki pakati pe squeegee nePCB, kuwedzera kudhinda kwekudhinda.Mukuwedzera, iyo squeegee pressure yakanyanya kuduku ichaita kuti stencil surface isiye mutsara we solder paste, zviri nyore kukonzera magirafu anonamira uye zvimwe zvinokanganisa kudhinda.Pane zvinopesana, iyo squeegee pressure yakakura kwazvo inotungamira kune solder paste kudhinda yakanyanya kutetepa, uye kunyange kukuvadza stencil.
2. Scraper angle.
Scraper angle inowanzoita 45 ° ~ 60 °, solder paste ine zvakanaka kukunguruka.Ukuru hwekona ye scraper inokanganisa ukuru hwesimba re vertical of the scraper pane solder paste, iyo diki kona, iyo yakakura vertical force.Nekushandura scraper angle inogona kuchinja kudzvinyirirwa kunogadzirwa ne scraper.
3. Squeegee kuoma
Kuomarara kwe squeegee kuchakanganisawo kukora kweiyo yakadhindwa solder paste.Kunyanya kupfava kusvina kunotungamira mukunyura solder paste, saka unofanirwa kushandisa yakaoma squeegee kana simbi squeegee, kazhinji uchishandisa Stainless simbi squeegee.
4. Kudhinda nekukurumidza
Kumhanyisa kwekudhinda kunowanzo kuisirwa ku15 ~ 100 mm / s.Kana kukurumidza kunonoka, iyo solder paste viscosity yakakura, hazvisi nyore kupotsa kudhindwa, uye kukanganisa kushanda kwekudhinda.Kumhanya kunomhanya zvakanyanya, iyo squeegee kuburikidza ne template yekuvhura nguva ipfupi, solder paste haigone kupinda mukati mekuvhura, nyore kukonzera solder paste haina kuzara kana kuvuza kwehurema.
5. Kudhinda gap
Kudhinda gap kunoreva chinhambwe pakati pepasi pepasi peiyo stencil uye PCB pamusoro, stencil kudhinda kunogona kukamurwa kuita yekusangana uye isiri-yekubata kudhinda mhando mbiri.Stencil kudhinda ine gap pakati pePCB inonzi non-contact printing, iyo gap yakawanda ye0 ~ 1.27mm, hapana nzira yekudhinda gap inonzi contact printing.Bata kudhinda stencil vertical separation inogona kuita kuti mhando yekudhinda ishandiswe neZ diki, kunyanya kune yakanaka pitch solder paste kudhinda.Kana iyo stencil ukobvu hwakakodzera, kudhinda kudhinda kunowanzoshandiswa.
6. Kusununguka nokukurumidza
Kana iyo squeegee ichipedza kudhinda sitiroko, iko kukurumidza kwe stencil inosiya PCB kunonzi kukurumidza kukurumidza.Kugadziriswa kwakaringana kwekumhanya kwekuburitsa, kuitira kuti stencil ibve paPCB kana paine nguva pfupi yekugara, kuitira kuti solder paste kubva pakuvhurika kwestencil iburitswe zvachose (yakaderedzwa), kuitira kuti uwane iyo Z yakanakisa solder paste mifananidzo.Iyo yekuparadzanisa kumhanya kwePCB uye stencil ichave nemhedzisiro yakakura pane inodhinda maitiro.Iyo yekudhiza nguva yakarebesa, iri nyore kusvika pasi peiyo stencil residual solder paste;nguva yekudhirowa ipfupi kwazvo, haikodzeri kune yakatwasuka solder paste, inokanganisa kujeka kwayo.
7. Stencil yekuchenesa frequency
Kuchenesa stencil chinhu chinoita kuti kuve nechokwadi chekudhinda, kuchenesa pasi pe stencil mukudhinda nzira yekubvisa tsvina iri pasi, iyo inobatsira kudzivirira kusvibiswa kwePCB.Kuchenesa kunowanzoitwa neanhydrous ethanol semushonga wekuchenesa.Kana pane zvakasara solder paste mukuvhurwa kwe stencil isati yagadzirwa, inofanira kucheneswa isati yashandiswa, uye kuve nechokwadi kuti hapana mhinduro yekuchenesa inoramba iripo, zvikasadaro ichakanganisa kusungirirwa kwesolder paste.Zvinowanzo taurwa kuti stencil inofanirwa kucheneswa nemaoko ne stencil yekupukuta bepa maminetsi makumi matatu ega ega, uye stencil inofanirwa kucheneswa ne ultrasonic uye doro mushure mekugadzirwa kuti ive nechokwadi chekuti hapana chasara solder paste mukuvhurwa kwestencil.
Nguva yekutumira: Zvita-09-2021