1. Zvinodiwa zvekutanga zveSMT process yechikamu dhizaini yemagadzirirwo ndeaya anotevera:
Kugoverwa kwezvikamu pabhodhi redunhu rakadhindwa rinofanira kunge rakafanana sezvinobvira.Kupisa simba reflow soldering yemhando hombe yemhando yakakura, uye yakanyanyisa kusungirira iri nyore kukonzera yakaderera tembiricha uye inotungamira kune chaiyo soldering.Panguva imwecheteyo, chimiro cheyunifomu chinobatsirawo kune kuenzana kwepakati pesimba rinokwevera zvinhu pasi.Mune vibration uye maitiro ekuedza, hazvisi nyore kukuvadza zvikamu, maburi ane simbi uye solder pads.
2. Kurongeka kwekugadzirisa kwezvikamu pabhodhi redunhu rakadhindwa rinofanira kunge rakafanana nekukwanisa kwezvikamu zvakafanana, uye hutungamiri hunofanirwa kunge hwakafanana kuti huve nyore kuisa, welding uye kuonekwa kwezvikamu.Kana electrolytic capacitor positive pole, diode positive pole, transistor single pini inopera, pini yekutanga yeintegrated circuit marongerwo nzira inopindirana sezvinobvira.Kudhinda kwenhamba dzese dzechikamu kwakafanana.
3. Zvikamu zvakakura zvinofanira kusiiwa zvakapoteredza SMD rework equipment kudziyisa musoro inogona kushandiswa saizi.
4. Zvikamu zvekupisa zvinofanira kunge zviri kure nezvimwe zvikamu sezvinobvira, zvinowanzoiswa mukona, bhokisi remhepo yemhepo.Zvikamu zvekupisa zvinofanirwa kutsigirwa nemamwe anotungamira kana zvimwe zvitsigiro (sekupisa kunyura) kuchengetedza imwe chinhambwe pakati pezvikamu zvekudziya uye yakadhindwa redunhu bhodhi repamusoro, ine diki chinhambwe che2mm.Zvikamu zvinopisa zvinobatanidza zvikamu zvekupisa nemapuranga akadhindwa ematunhu mumapuranga akawanda.Mukugadzira, simbi solder pads inogadzirwa, uye mukugadzirisa, solder inoshandiswa kuvabatanidza, kuitira kuti kupisa kunobudiswa kuburikidza nemapuranga edunhu akadhindwa.
5. Kupisa-sensitive components zvinofanira kuchengetedzwa kubva kune zvinopisa zvinopisa.Zvakadai semaodhiyo, masekete akabatanidzwa, electrolytic capacitors uye zvimwe zvepurasitiki kesi zvikamu, zvinofanirwa kunge zviri kure nebhiriji stack, yakakwirira-simba zvikamu, radiators uye yakakwirira-simba resistors.
. , uye wodziisa munzvimbo iri nyore kugadzirisa uye kutsiva.Kana kugadziridzwa kwemuchina, kunofanirwa kuiswa pane yakadhindwa redunhu bhodhi kufambisa kugadziriswa kwenzvimbo;Kana yakagadziridzwa kunze kwemuchina, chinzvimbo chayo chinofanira kuchinjirwa kune chinzvimbo chekugadzirisa knob pane chassis pani kudzivirira kupokana pakati pematatu-dimensional nzvimbo uye maviri-dimensional nzvimbo.Semuenzaniso, kuvhura kwepaneru kwebhatani switch kunofanirwa kuenderana nenzvimbo yekuchinja vacancy pane yakadhindwa redunhu bhodhi.
7. Gomba rakagadziriswa rinofanirwa kuiswa padyo neterminal, plug uye kudhonza zvikamu, chikamu chepakati cheterminal refu uye chikamu chinowanzo kumanikidzwa, uye nzvimbo inoenderana inofanira kusiiwa yakatenderedza gomba rakagadziriswa kudzivirira deformation nekuda kwe kuwedzera kwekushisa.Zvakadai senge refu terminal yekupisa yekuwedzera yakakomba kupfuura yakadhindwa redunhu bhodhi, wave solder inotarirwa kuhondo yechiitiko.
8. Kune zvimwe zvikamu uye zvikamu (zvakadai se transformers, electrolytic capacitors, varistors, bridge stacks, radiators, etc.) nekushivirira kukuru uye kuderera kwakadzika, nguva pakati pavo nezvimwe zvikamu zvinofanira kuwedzerwa neimwe margin pahwaro hwe. mamiriro ekutanga.
9. Zvinokurudzirwa kuti kuwedzera margin ye electrolytic capacitors, varistors, bridge stacks, polyester capacitors uye mamwe ma capacitor haafaniri kunge ari pasi pe1mm, uye iyo ye transformers, radiator uye resistors inopfuura 5W (kusanganisira 5W) inofanira kuva isingasviki 3mm.
10. Iyo electrolytic capacitor haifanire kubata zvinhu zvinodziya, senge-high-simba resistors, thermistors, transformers, radiators, etc. The interval pakati pe electrolytic capacitor uye radiator inofanira kuva shoma 10mm, uye nguva pakati pezvimwe zvikamu uye. radiator inofanira kunge iri pasi pe20mm.
Nguva yekutumira: Zvita-09-2020