Ukucutshungulwa kwe-PCBA kanye ne-SMT ngokuvamile kunezinqubo ezimbili, enye inqubo engenamsebenzi kanti enye iyinqubo eholwayo. Wonke umuntu uyazi ukuthi ukuhola kuyingozi kubantu. Ngakho-ke, inqubo engenamahhala ihlangabezana nezidingo zokuvikelwa kwemvelo, okuwumkhuba ojwayelekile kanye nokukhethwa okungenakugwenywa emlandweni. . Asicabangi ukuthi i-PCBA ecubungula izitshalo ezingezansi kwesilinganiso (ngaphansi kwemigqa engu-20 ye-SMT) inamandla okwamukela ama-oda wokusebenza wamahhala okuhola futhi aholayo, ngoba umehluko phakathi kwezinto zokwakha, imishini, kanye nezinqubo zikhulisa kakhulu izindleko nobunzima bokuphatha. Angazi ukuthi kulula kanjani ukwenza inqubo eholayo ngokuqondile.
Ngezansi, umehluko phakathi kwenqubo yokuhola nenqubo yokuhola ufingqiwe kafushane ngokulandelayo. Kukhona ezinye izinganekwane, futhi ngithemba ukuthi ungangilungisa.
1. Ukwakheka kwe-alloy kwehlukile: Inqubo evamile yokuhola i-tin-lead ukwakheka ngu-63/37, ngenkathi ukwakheka kwe-holloy-free alloy kungu-sac 305, okungukuthi, i-SN: 3%, CU: 0.5%. Inqubo engenamkhawulo ayikwazi ngokuphelele ukuthi i-LEAL ngokuphelele, iqukethe kuphela okuqukethwe okuphansi kakhulu kokuhola, njengokuhola ngaphansi kuka-500 ppm.
2. Amaphoyinti ahlukile ancibilikayo: Iphuzu lokuncibilika le-lead-tin lingu-180 ° ~ 185 °, futhi izinga lokushisa elisebenzayo licishe libe ngu-240 ° ~ 250 ° ~ 250 °. Iphoyinti lokuncibilika le-Tin-Free-free lit 210 ° ~ 235 °, futhi izinga lokushisa elisebenzayo lingu-245 ° ~ 280 °. Ngokwesipiliyoni, ngaso sonke isikhathi 8% -10% ukukhuphuka kokuqukethwe kwe-Tin, indawo yokuncibilika inyuka ngamadigri ayi-10, futhi izinga lokushisa elisebenzayo likhuphuka ngama-degree angama-10- 20.
3. Izindleko zihlukile: Intengo kathani ibiza kakhulu kunaleyo yokuhola. Lapho i-solder ebaluleke ngokulinganayo ithathelwa indawo nge-tin, izindleko ze-soler zizovuka kakhulu. Ngakho-ke, izindleko zenqubo yokuhola ziphakeme kakhulu kunaleyo nqubo eholayo. Izibalo zikhombisa ukuthi ibha ye-tin ye-wave soldering kanye ne-tin wire for i-Manual Woldering, inqubo eholayo iphakeme izikhathi eziyi-2.7 kunenqubo eholayo, futhi unamathisela umthengisi
4. Inqubo yehlukile: Inqubo eholayo kanye nenqubo yokuhola mahhala ingabonakala egameni. Kepha ngqo kwinqubo, i-soler, izakhi zemishini, kanye nemishini esetshenzisiwe, njengezindawo zokudlala zegagasi, amaphrinta wokunamathisela we-wave, kanye ne-poldering irons yokuthengisa okwenziwa ngesandla, ahlukile. Lesi futhi isizathu esiyinhloko esenza kube nzima ukusingatha zombili izinqubo eziholwayo neziholayo ezihamba mahhala esitshalweni se-PCBA esisezingeni elincane.
Okunye ukungezwani okufana ne-Process Window, ukuzungeza, nezidingo zokuvikela imvelo nazo zihlukile. I-Process Window yenqubo eholayo inkulu futhi ukuzungeza kuzoba ngcono. Kodwa-ke, ngoba inqubo engenamahhala inobungane ngokwemvelo, futhi ubuchwepheshe buyaqhubeka nokwenza ngcono, ubuchwepheshe bezinqubo ezihola phambili buye buthembekile futhi buvuthiwe.