Tsatanetsatane wa njira yopangira PCBA (kuphatikiza njira ya SMT), bwerani mudzawone!
01."SMT Process Flow"
Reflow kuwotcherera kumatanthauza njira yofewa yowotchera yomwe imazindikira kulumikizana kwamakina ndi magetsi pakati pa nsonga yowotcherera ya chigawo cholumikizidwa pamwamba kapena pini ndi PCB pad posungunula phala la solder lomwe lidasindikizidwa kale pa PCB pad. The ndondomeko otaya ndi: kusindikiza solder phala - chigamba - reflow kuwotcherera, monga momwe chithunzi pansipa.
1. Solder phala kusindikiza
Cholinga chake ndikugwiritsa ntchito kuchuluka koyenera kwa solder phala wogawana pa solder pad ya PCB kuonetsetsa kuti zigawo za chigamba ndi cholumikizira chofananira cha PCB zimalumikizidwanso kuti zigwirizane bwino ndi magetsi komanso kukhala ndi mphamvu zamakina zokwanira. Kodi mungawonetse bwanji kuti phala la solder likugwiritsidwa ntchito mofanana pa pedi iliyonse? Tiyenera kupanga mesh yachitsulo. Phala la solder limakutidwa mofanana pa solder iliyonse pansi pa zochitika za scraper kupyolera mu mabowo ofanana muzitsulo zachitsulo. Zitsanzo za chithunzi chachitsulo cha mesh chikuwonetsedwa mu chithunzi chotsatirachi.
Chithunzi chosindikizira cha solder chikuwonetsedwa mu chithunzi chotsatirachi.
The kusindikizidwa solder phala PCB akuwonetsedwa chithunzi chotsatira.
2. Chigamba
Izi ndi kugwiritsa ntchito makina okwera kuti akweze bwino zigawo za chip kumalo ofananirako pa PCB pamwamba pa phala losindikizidwa kapena guluu.
Makina a SMT amatha kugawidwa m'mitundu iwiri malinga ndi ntchito zawo:
Makina othamanga kwambiri: oyenera kuyikapo tinthu tating'onoting'ono tating'ono: monga ma capacitors, resistors, etc., amathanso kuyika zida zina za IC, koma kulondola kuli kochepa.
Makina a B Universal: oyenerera kukwera kwa amuna kapena akazi okhaokha kapena zigawo zolondola kwambiri: monga QFP, BGA, SOT, SOP, PLCC ndi zina zotero.
Chithunzi cha zida zamakina a SMT chikuwonetsedwa pachithunzi chotsatira.
PCB pambuyo chigamba chikuwonetsedwa mu chithunzi chotsatirachi.
3. Reflow kuwotcherera
Reflow Soldring ndi kumasulira kwenikweni kwa English Reflow soldring, komwe kumalumikizidwa ndi makina ndi magetsi pakati pa zida zapamsonkhano ndi PCB solder pad posungunula phala la solder pa board board solder pad, kupanga gawo lamagetsi.
Reflow kuwotcherera ndi njira yofunika kwambiri pakupanga kwa SMT, ndipo kukhazikika koyenera kwa kutentha ndiko chinsinsi chotsimikizira mtundu wa kuwotchereranso. Zokhotakhota zosayenera kutentha zingayambitse PCB kuwotcherera zilema monga kuwotcherera chosakwanira, kuwotcherera pafupifupi, chigawo warping, ndi kwambiri solder mipira, zomwe zimakhudza khalidwe mankhwala.
Chithunzi cha zida za ng'anjo yowotcherera reflow chikuwonetsedwa mu chithunzi chotsatirachi.
Pambuyo pa ng'anjo ya reflow, PCB yomalizidwa ndi kuwotchereranso ikuwonetsedwa pachithunzichi.
