I-PCBA kanye ne-SMT processing ngokuvamile inezinqubo ezimbili, eyodwa inqubo engenamthofu kanti enye iyinqubo eholayo. Wonke umuntu uyazi ukuthi umthofu uyingozi kubantu. Ngakho-ke, inqubo engenamthofu ihlangabezana nezidingo zokuvikelwa kwemvelo, okuwumkhuba ojwayelekile kanye nokukhetha okungenakugwenywa emlandweni. . Asicabangi ukuthi izitshalo ezicubungulayo ze-PCBA ezingaphansi kwesikali (ngezansi kwemigqa ye-SMT engu-20) zinamandla okwamukela ama-oda okucubungula ama-SMT angenayo umthofu nangenamthofu, ngoba umehluko phakathi kwezinto, okokusebenza, nezinqubo kwandisa kakhulu izindleko nobunzima. labaphathi. Angazi ukuthi kulula kangakanani ukwenza inqubo engenamthofu ngokuqondile.
Ngezansi, umehluko phakathi kwenqubo yomthofu kanye nenqubo engenamthofu ufinyezwa kanjena. Kukhona okungalungile, futhi ngithemba ukuthi ungangilungisa.
1. Ukwakhiwa kwe-alloy kuhlukile: inqubo evamile yokuhola ukwakheka kwe-tin-lead ngu-63/37, kuyilapho ukwakheka kwe-alloy okungenayo umthofu kuyi-SAC 305, okungukuthi, Sn: 96.5%, Ag: 3%, Cu: 0.5%. Inqubo engenamthofu ayinakuqinisekisa ngokuphelele ukuthi ayinawo nhlobo umthofu, iqukethe kuphela okuqukethwe okuphansi kakhulu komthofu, okufana nomthofu ongaphansi kuka-500 PPM.
2. Amaphuzu okuncibilika ahlukene: indawo yokuncibilika kwe-lead-tin ingu-180°~185°, kanti izinga lokushisa elisebenzayo lingaba ngu-240°~250°. Indawo encibilika ithini elingenamthofu ngu-210°~235°, kanti izinga lokushisa elisebenzayo lingu-245°~280°. Ngokusho kokuhlangenwe nakho, kuwo wonke ukwanda kwe-8% -10% kokuqukethwe kwe-tin, iphuzu lokuncibilika likhuphuka cishe ngama-degree angu-10, futhi izinga lokushisa lokusebenza likhuphuka ngama-degree angu-10-20.
3. Izindleko zihlukile: intengo yethini ibiza kakhulu kunaleyo yomthofu. Lapho i-solder ebaluleke ngokulinganayo ithathelwa indawo nge-tin, izindleko ze-solder zizokhuphuka kakhulu. Ngakho-ke, izindleko zenqubo engenamthofu ziphakeme kakhulu kunaleyo yenqubo yokuhola. Izibalo zibonisa ukuthi i-tin bar ye-wave soldering kanye ne-tin wire soldering manual, inqubo engenamthofu iphakeme izikhathi ezingu-2.7 kunenqubo yokuhola, kanye ne-solder paste ye-reflow soldering Izindleko zikhuphuka cishe izikhathi ezingu-1.5.
4. Inqubo ihlukile: inqubo yokuhola kanye nenqubo engenamthofu ingabonakala egameni. Kodwa ngokuqondene nenqubo, i-solder, izakhi, kanye nemishini esetshenziswayo, njengeziko le-wave soldering, amaphrinta we-solder paste, nezinsimbi zokunamathisela zokunamathisela ngesandla, zihlukile. Lesi futhi isizathu esiyinhloko esenza kube nzima ukuphatha kokubili izinqubo ezingenamthofu nezingenamthofu endaweni encane yokucubungula ye-PCBA.
Okunye okuhlukile okufana newindi lenqubo, ukuthengiselana, kanye nezidingo zokuvikela imvelo nakho kuhlukile. Iwindi lenqubo yenqubo yokuhola likhulu futhi ukuthengiselana kuzoba ngcono. Nokho, ngenxa yokuthi inqubo engenamthofu ihambisana kakhulu nemvelo, futhi nobuchwepheshe buyaqhubeka buthuthuka, ubuchwepheshe benqubo obungenamthofu buye buya ngokuya buthembekile futhi buvuthwa.