Ts'ebetso e qaqileng ea tlhahiso ea PCBA (ho kenyeletsoa le ts'ebetso ea SMT), kena 'me u bone!
01."SMT Process Flow"
Reflow welding e bolela ts'ebetso e bonolo ea brazing e hlokomelang khokahanyo ea mochini le motlakase pakeng tsa pheletso ea welding ea karolo e kopaneng ea bokaholimo kapa pin le PCB pad ka ho qhibilihisa solder paste e hatisitsoeng pele ho PCB pad. Phallo ea ts'ebetso ke: khatiso ea solder paste - patch - reflow welding, joalo ka ha ho bonts'itsoe setšoantšong se ka tlase.
1. Khatiso ea solder paste
Sepheo ke ho sebelisa palo e loketseng ea peista ea solder ka ho lekana holim'a solder pad ea PCB ho etsa bonnete ba hore likaroloana tsa patch le pad ea solder e tsamaellanang ea PCB li ts'oaroa hape ho fihlela motlakase o motle le ho ba le matla a lekaneng a mochine. U ka etsa bonnete ba hore pente ea solder e sebelisoa ka tsela e lekanang joang ho pad ka 'ngoe? Re hloka ho etsa mesh ea tšepe. Sekhahla sa solder se koahetsoe ka mokhoa o ts'oanang holim'a pampiri e 'ngoe le e' ngoe ea solder tlas'a ketso ea scraper ka likoti tse lumellanang le mesh ea tšepe. Mehlala ea setšoantšo sa tšepe ea tšepe e bontšoa setšoantšong se latelang.
Setšoantšo sa khatiso sa solder paste se bontšoa setšoantšong se latelang.
Paste e hatisitsoeng ea solder PCB e bontšoa setšoantšong se latelang.
2. Patch
Ts'ebetso ena ke ho sebelisa mochini o ntseng o hlopha ho kenya likarolo tsa chip ka nepo sebakeng se lumellanang le karolo ea PCB ea sekhomaretsi se hatisitsoeng sa solder kapa patch glue.
Mechini ea SMT e ka aroloa ka mefuta e 'meli ho latela mesebetsi ea eona:
Mochini o lebelo le phahameng: o loketse ho kenya palo e kholo ea likaroloana tse nyane: joalo ka li-capacitor, li-resistors, joalo-joalo, li ka boela tsa beha likarolo tse ling tsa IC, empa ho nepahala ho lekanyelitsoe.
B Mochini oa bokahohle: o loketse ho kenya batho ba bong bo fapaneng kapa likarolo tse nepahetseng tse phahameng: tse kang QFP, BGA, SOT, SOP, PLCC joalo-joalo.
Setšoantšo sa thepa ea mochine oa SMT se bontšoa setšoantšong se latelang.
PCB ka mor'a patch e bontšoa setšoantšong se latelang.
3. Reflow welding
Reflow Soldring ke phetolelo ea sebele ea English Reflow soldring, e leng khokahanyo ea mochine le ea motlakase pakeng tsa likarolo tsa kopano ea holim'a metsi le PCB solder pad ka ho qhibilihisa pente ea solder holim'a lebokose la potoloho, ho etsa potoloho ea motlakase.
Reflow welding ke ts'ebetso ea bohlokoa tlhahisong ea SMT, 'me boemo bo loketseng ba mocheso ke senotlolo sa ho netefatsa boleng ba ho tjheseletsa ha reflow. Li-curve tse sa nepahalang tsa mocheso li tla baka liphoso tsa ho tjheseletsa PCB joalo ka welding e sa fellang, welding ea sebele, component warping, le libolo tse ngata tse solder, tse tla ama boleng ba sehlahisoa.
Setšoantšo sa thepa ea reflow welding sebōpi se bontšoa setšoantšong se latelang.
Ka mor'a hore reflow sebōpi, PCB phethoa ka reflow welding e bontšoa setšoantšong se ka tlase.
