Umshini wokuphrinta we-solder unama iyithuluzi elibalulekile engxenyeni engaphambili yomugqa we-SMT, ikakhulukazi usebenzisa i-stencil ukuze uphrinte unamathisele we-solder kuphedi eshiwo, ukuphrinta okuhle noma okubi kwe-solder paste, kuthinta ngqo ikhwalithi yokugcina ye-solder.Okulandelayo ukuchaza ulwazi lobuchwepheshe lwezilungiselelo zemingcele yenqubo yomshini wokuphrinta.
1. Ukucindezela kwe-squeegee.
Ukucindezela kwe-squeegee kufanele kusekelwe ezidingweni zangempela zomkhiqizo wokukhiqiza.Ukucindezela kuncane kakhulu, kungase kube nezimo ezimbili: i-squeegee enqubweni yokuthuthukisa amandla aphansi nayo incane, izobangela ukuvuza kwenani lokuphrinta okwanele;okwesibili, i-squeegee ayisondeli ebusweni be-stencil, ukuphrinta ngenxa yokuba khona kwegebe elincane phakathi kwe-squeegee ne-PCB, okwandisa ukushuba kokunyathelisa.Ngaphezu kwalokho, ukucindezela kwe-squeegee kuncane kakhulu kuzokwenza indawo ye-stencil ishiye ungqimba lwe-solder paste, kulula ukubangela ukunamathela kwehluzo nokunye ukukhubazeka kokuphrinta.Ngokuphambene nalokho, ukucindezela kwe-squeegee kukhulu kakhulu kuzoholela kalula ekunyatheliseni kokunamathisela kwe-solder kuncane kakhulu, futhi kulimaza ngisho ne-stencil.
2. I-angle ye-Scraper.
I-engeli ye-Scraper ivamise ukuba ngu-45° ~ 60°, i-solder paste egoqeka kahle.Ubukhulu be-engeli ye-scraper buthinta usayizi wamandla aqondile we-scraper ku-solder paste, i-engeli encane, amandla amakhulu aqondile.Ngokushintsha i-angle ye-scraper ingashintsha ukucindezela okukhiqizwa yi-scraper.
3. Ukuqina kwe-squeegee
Ukuqina kwe-squeegee kuzophinde kuthinte ubukhulu be-solder paste ephrintiwe.I-squeegee ethambile kakhulu izoholela ekugxilweni kwe-solder, ngakho-ke kufanele usebenzise i-squeegee eqinile noma i-squeegee yensimbi, ngokuvamile kusetshenziswa i-stainless steel squeegee.
4. Isivinini sokuphrinta
Isivinini sokuphrinta ngokuvamile sisethelwa ku-15 ~ 100 mm / s.Uma ijubane lihamba kancane, i-solder paste viscosity inkulu, akulula ukuphuthelwa ukuphrinta, futhi kuthinte ukusebenza kahle kokuphrinta.Isivinini siyashesha kakhulu, i-squeegee ngesikhathi sokuvula isifanekiso sifushane kakhulu, i-solder paste ayikwazi ukungena ngokugcwele ekuvuleni, kulula ukubangela ukunamathisela kwe-solder akugcwele noma ukuvuza kokukhubazeka.
5. Igebe lokuphrinta
Igebe lokuphrinta libhekisela ebangeni eliphakathi kwendawo engaphansi ye-stencil kanye nendawo ye-PCB, ukuphrinta kwe-stencil kungahlukaniswa ngokuthintana nokuphrinta okungeyena othintana naye izinhlobo ezimbili.Ukuphrinta kwe-stencil okunegebe phakathi kwe-PCB kubizwa ngokuthi ukuphrinta okungeyena othintana naye, igebe elijwayelekile lika-0 ~ 1.27mm, ayikho indlela yokuphrinta yegebe lokuphrinta elibizwa ngokuthi ukuphrinta kokuxhumana.Ukuhlukaniswa okuqondile kwe-stencil okuphrinta kungenza ikhwalithi yokuphrinta ithintwe u-Z ibe mancane, ikakhulukazi ukuphrinta kwe-pitch solder paste.Uma ubukhulu be-stencil bufanelekile, ukuphrinta kokuxhumana ngokuvamile kusetshenziswa.
6. Isivinini sokukhishwa
Lapho i-squeegee iqeda ukunyathelisa kokunyathelisa, isivinini esisheshayo se-stencil esishiya i-PCB sibizwa ngokuthi isivinini sokudiliza.Ukulungiswa okufanele kwejubane lokukhishwa, ukuze i-stencil ishiye i-PCB uma kunenqubo yokuhlala iDemo, ukuze unamathisele we-solder ovela ezimbotsheni ze-stencil ukhululwe ngokuphelele (demolded), ukuze kutholwe i-Z best solder paste ihluzo.Isivinini sokuhlukanisa se-PCB ne-stencil sizoba nomthelela omkhulu emphumeleni wokuphrinta.Isikhathi sokudiliza side kakhulu, kulula ukufika phansi kwe-stencil residual solder paste;isikhathi sokudiliza sifushane kakhulu, asihambisani ne-solder paste eqondile, ethinta ukucaca kwayo.
7. Imvamisa yokuhlanza i-stencil
Ukuhlanza i-stencil kuyisici sokuqinisekisa ikhwalithi yokunyathelisa, ukuhlanza phansi kwe-stencil enqubweni yokunyathelisa ukuze kuqedwe ukungcola phansi, okusiza ukuvimbela ukungcola kwe-PCB.Ukuhlanza kuvame ukwenziwa nge-ethanol engenamanzi njengesixazululo sokuhlanza.Uma kukhona unamathisele we-solder osele ekuvuleni kwe-stencil ngaphambi kokukhiqizwa, kufanele ihlanzwe ngaphambi kokusetshenziswa, futhi uqinisekise ukuthi akukho sixazululo sokuhlanza esisele, ngaphandle kwalokho kuzothinta ukuthungwa kwe-solder paste.Ngokuvamile kushiwo ukuthi i-stencil kufanele ihlanzwe ngesandla ngephepha lokusula nge-stencil njalo ngemizuzu engu-30, futhi i-stencil kufanele ihlanzwe nge-ultrasonic kanye notshwala ngemva kokukhiqizwa ukuze kuqinisekiswe ukuthi akukho ukunamathisela kwe-solder okusele ekuvuleni kwe-stencil.
Isikhathi sokuthumela: Dec-09-2021