Chifukwa chiyani SMT ikufunika thireyi ya uvuni yobwereranso yokhala ndi chonyamulira chathunthu?

SMT reflow uvunindi chida chofunikira chogulitsira munjira ya SMT, yomwe kwenikweni imakhala yophatikiza ng'anjo yophikira.ntchito yake yaikulu ndi kulola phala solder mu ng'anjo reflow, solder adzasungunuka pa kutentha kwambiri pambuyo solder akhoza kupanga zigawo SMD ndi matabwa dera pamodzi mu kuwotcherera zida.Popanda SMT reflow soldering zida SMT ndondomeko sizingatheke kumaliza kuti zigawo zamagetsi ndi dera bolodi soldering ntchito.Ndipo SMT pamwamba pa thireyi ya ng'anjo ndi chida chofunikira kwambiri pamene chinthucho chikudutsa pazitsulo zowonjezera, onani apa mungakhale ndi mafunso: SMT pamwamba pa thireyi ya uvuni ndi chiyani?Kodi cholinga chogwiritsa ntchito ma tray a SMT overbake kapena zonyamulira zowotcha ndi chiyani?Tawonani momwe tray ya SMT overbake ilili.

1. Kodi tray ya SMT overbake ndi chiyani?

Chotchedwa SMT over-burner tray kapena over-burner chonyamulira, kwenikweni, amagwiritsidwa ntchito kugwira PCB ndiyeno kupita nayo kumbuyo kwa soldering ng'anjo tray kapena chonyamulira.thireyi chonyamulira zambiri udindo ndime ntchito kukonza PCB kupewa kuthamanga kapena mapindikidwe, ena apamwamba kwambiri thireyi chonyamulira adzawonjezera chivundikiro, kawirikawiri kwa FPC, ndi kukhazikitsa maginito pa, download chida pamene suction chikho kusalaza. ndi, kotero SMT Chip processing chomera akhoza kupewa PCB mapindikidwe.

2. Kugwiritsa ntchito SMT pa thireyi ya uvuni kapena pa cholinga cha chonyamulira ng'anjo

Kupanga kwa SMT mukamagwiritsa ntchito thireyi ya ng'anjo ndikuchepetsa kusinthika kwa PCB ndikuletsa magawo onenepa kwambiri kugwa, zonse zomwe zimagwirizana ndi SMT kubwerera kumalo otentha kwambiri a ng'anjo, kuzinthu zambiri zomwe tsopano zikugwiritsa ntchito njira yopanda kutsogolera. , lead-free SAC305 solder phala phala losungunuka la 217 ℃, ndi SAC0307 solder phala losungunuka lala kutentha kumagwera pafupifupi 217 ℃ ~ 225 ℃, kutentha kwambiri kubwerera kwa solder Nthawi zambiri Akulimbikitsidwa pakati pa 240 ~ 250 ℃ , nthawi zambiri timasankha mbale ya FR4 ya Tg150 pamwambapa.Ndiko kunena kuti, pamene PCB alowa m'dera kutentha kwa ng'anjo soldering, Ndipotu, kwa nthawi yaitali kuposa galasi kutengerapo kutentha mu mphira boma, mphira boma la PCB adzakhala opunduka kusonyeza makhalidwe ake zinthu basi. kulondola.

Kuphatikizidwa ndi kupatulira kwa bolodi makulidwe, kuchokera ku makulidwe ambiri a 1.6mm mpaka 0.8mm, ndipo ngakhale 0.4mm PCB, bolodi laling'ono lotere mu ubatizo wa kutentha kwambiri pambuyo pa ng'anjo yotenthetsera, ndizosavuta chifukwa chapamwamba. kutentha ndi vuto deformation board.

SMT pa thireyi ng'anjo kapena pamwamba chonyamulira ng'anjo ndi kugonjetsa PCB mapindikidwe ndi mbali kugwa mavuto ndi kuonekera, izo zambiri amagwiritsa ntchito mzati udindo kukonza dzenje PCB, mu mbale kutentha mapindikidwe bwino kukhalabe mawonekedwe a PCB. kuchepetsa mbale mapindikidwe, ndithudi, payeneranso kukhala mipiringidzo zina kuthandiza malo apakati mbale chifukwa cha mphamvu yokoka akhoza kupinda vuto la kumira.

Komanso, mungagwiritse ntchito mochulukira chonyamulira si kophweka deform makhalidwe a kamangidwe ka nthiti kapena mfundo thandizo m'munsimu mbali onenepa kuonetsetsa kuti mbali musagwe vuto, koma mapangidwe chonyamulira ayenera kukhala kwambiri. kusamala kupewa mfundo zothandizira kwambiri kukweza mbali chifukwa cha mbali yachiwiri ya kusalondola kwa solder phala kusindikiza vuto kumachitika.