Chithandizo chapamwamba cha PCB ndiye chinsinsi komanso maziko amtundu wa SMT patch.Njira yochiritsira ya chiyanjano ichi makamaka imaphatikizapo mfundo zotsatirazi.Lero, ndigawana nanu zokumana nazo mu proofing board board:
(1) Kupatula ENG, makulidwe a plating wosanjikiza sanatchulidwe momveka bwino pamiyezo yapadziko lonse ya PC.Zimangofunika kukwaniritsa zofunikira za solderability.Zomwe zimafunikira pamakampani ndi izi.
OSP: 0.15 ~ 0.5 μm, osatchulidwa ndi IPC.Analimbikitsa kugwiritsa ntchito 0,3 ~ 0.4um
EING: Ni-3 ~ 5um;Au-0.05 ~ 0.20um (PC imangonena zomwe zili zathinnest zomwe zilipo)
Im-Ag: 0.05 ~ 0.20um, yokulirapo, ndiyowopsa kwambiri (PC sinatchulidwe)
Im-Sn: ≥0.08um.Chifukwa chokulirapo ndikuti Sn ndi Cu zipitilira kukula kukhala CuSn kutentha kwa firiji, zomwe zimakhudza kusungunuka.
HASL Sn63Pb37 nthawi zambiri imapangidwa mwachilengedwe pakati pa 1 ndi 25um.Ndizovuta kulamulira molondola ndondomekoyi.Zopanda lead makamaka zimagwiritsa ntchito aloyi ya SnCu.Chifukwa cha kutentha kwambiri, ndikosavuta kupanga Cu3Sn yokhala ndi mawu osamveka bwino, ndipo imagwiritsidwa ntchito movutikira pakadali pano.
(2) Kunyowa kwa SAC387 (malinga ndi nthawi yonyowa pansi pa nthawi zosiyanasiyana zotentha, unit: s).
0 nthawi: im-sn (2) florida kukalamba (1.2), osp (1.2) im-ag (3).
Zweiter PLENAR PHUNZIRO Zweiter PLENAR SESSION Im-Sn ili ndi kukana kwabwino kwa dzimbiri, koma kukana kwake kogulitsa ndikocheperako!
Nthawi 4: CHICHEWA (3)-ImAg (4.3)-OSP (10)-ImSn (10).
(3) Kunyowa kwa SAC305 (atadutsa ng'anjo kawiri).
CHICHEWA (5.1)—Im-Ag (4.5)—Im-Sn (1.5)—OSP (0.3).
M'malo mwake, amateurs amatha kusokonezedwa kwambiri ndi magawo aukadaulowa, koma ziyenera kuzindikirika ndi opanga ma PCB proofing and patching.
Nthawi yotumiza: May-28-2021
