Umehluko Oyinhloko Phakathi Kwezinqubo Zokuhola kanye Nezingenayo Umthofu Ekucutshungulweni kwe-PCBA

PCBA,Ukucutshungulwa kwe-SMT ngokuvamile kunezinhlobo ezimbili zenqubo, eyodwa inqubo engenamthofu, enye inqubo yokuhola, sonke siyazi ukuthi umthofu uyingozi kubantu, ngakho inqubo engenamthofu ihlangabezana nezidingo zokuvikelwa kwemvelo, kuwumkhuba we izikhathi, ukukhetha okungenakugwenywa komlando.

Ngezansi, umehluko phakathi kwenqubo yomthofu kanye nenqubo engenamthofu ufinyezwa kanjena.Uma ubuchwepheshe bomhlaba jikelele ukuhlaziywa kwe-chip ye-SMT kungaqediwe, sithemba ukuthi ungenza ukulungisa okwengeziwe.

1. Ukwakheka kwengxubevange kuhlukile: 63/37 kathayela nomthofu kuvamile enqubweni yomthofu, kuyilapho i-sac 305 iku-alloy-free alloy, okungukuthi, SN: 96.5%, Ag: 3%, Cu: 0.5% .Inqubo yamahhala yomthofu ayikwazi ukuqinisekisa ngokuphelele ukuthi awukho nhlobo umthofu, iqukethe kuphela okuqukethwe okuphansi komthofu, okufana nomthofu ongaphansi kuka-500 ppm.

2. Amaphuzu okuncibilika ahlukene: indawo yokuncibilika kukathayela oholayo ngu-180 ° kuya ku-185 ° futhi izinga lokushisa lokusebenza lingaba ngu-240 ° kuya ku-250 °.Indawo encibilika ithini elingenamthofu ngu-210 ° kuya ku-235 ° futhi izinga lokushisa elisebenzayo lingu-245 ° kuya ku-280 ° ngokulandelanayo.Ngokusho kokuhlangenwe nakho, njalo ngo-8% - 10% ukwanda kokuqukethwe kwe-tin, iphuzu lokuncibilika likhuphuka cishe ngama-degree angu-10, futhi izinga lokushisa lokusebenza likhuphuka ngo-10-20 degrees.

3. Izindleko zihlukile: ithini libiza kakhulu kunomthofu, futhi lapho izinguquko ze-solder ezibaluleke ngokulinganayo ziholela ethini, izindleko ze-solder zikhuphuka kakhulu.Ngakho-ke, izindleko zenqubo engenamthofu ziphezulu kakhulu kunezohlelo lomthofu.Izibalo zibonisa ukuthi izindleko zenqubo yokuhola i-lead-free ziphindwe izikhathi ezingu-2.7 kunaleyo yenqubo engenamthofu, futhi izindleko zokunamathisela i-solder ye-reflow soldering cishe izikhathi ezingu-1.5 ziphakeme kunezo zenqubo engenamthofu.

4. Inqubo ihlukile: kunezinqubo zokuhola nezingenamthofu, ezingabonakala egameni.Kodwa ethize inqubo, okungukuthi ukusebenzisa solder, izingxenye kanye nemishini, ezifana wave soldering esithandweni, solder unama ukuphrinta umshini, soldering iron for Welding manual, njll Lesi futhi isizathu esiyinhloko ukuthi kungani kunzima ukucubungula kokubili umthofu- izinqubo zamahhala neziholayo endaweni encane yokucubungula ye-PCBA.

Umehluko kwezinye izici, njengewindi lenqubo, izidingo zokushisela kanye nokuvikelwa kwemvelo nazo zihlukile.Iwindi lenqubo lenqubo yokuhola likhulu futhi ukuthengiselana kungcono.Kodwa-ke, ngenxa yokuthi inqubo engenamthofu ihambisana kakhulu nezidingo zokuvikelwa kwemvelo, futhi ngokuqhubeka okuqhubekayo kobuchwepheshe nganoma yisiphi isikhathi, ubuchwepheshe benqubo engenamthofu buye buya ngokuya buthembekile futhi buvuthwa.


Isikhathi sokuthumela: Jul-29-2020