Na SMT nhazi, PCB substrates tupu mmalite nke nhazi, na PCB ga-enyocha na-anwale, họrọ izute SMT mmepụta chọrọ nke PCB, na erughị eru laghachiri PCB soplaya, kpọmkwem chọrọ nke PCB nwere ike na-ezo aka. IPC-a-610c International General Electronics Industry Assembly Standards, ndị na-esonụ bụ ụfọdụ n'ime isi chọrọ nke SMT nhazi nke PCB.
1. PCB ga-adị larịị na ire ụtọ
PCB n'ozuzu chọrọ ewepụghị na-eji ire ụtọ, ike warp elu, ma ọ bụ na solder mado obibi na SMT igwe ọnyịnye ga-arụpụta oké ihe ọjọọ, dị ka ya pụta nke cracks.
2. The thermal conductivity
N'ime igwe reflow reflow na igwe na-ere ọkụ, a ga-enwe ebe a na-ekpo ọkụ, na-emekarị ka PCB kpoo ọkụ n'otu n'otu, na okpomọkụ ụfọdụ, ka mma okpomọkụ nke PCB mkpụrụ, na-emepụta obere ihe ọjọọ.
3. Okpomọkụ na-eguzogide
Na mmepe nke SMT usoro na gburugburu ebe obibi chọrọ, ụzọ-free usoro e ọtụtụ-eji, ma kpatara site ịrị elu na ịgbado ọkụ okpomọkụ, okpomọkụ na-eguzogide nke PCB elu chọrọ, ụzọ-free usoro na reflow soldering, okpomọkụ kwesịrị. iru 217 ~ 245 ℃, oge dịruru 30 ~ 65s, otú izugbe PCB okpomọkụ iguzogide 260 degrees Celsius, na ikpeazụ 10s chọrọ.
4. Adhesion nke ọla kọpa
Ike njikọ nke foil ọla kọpa kwesịrị iru 1.5kg/cm² iji gbochie PCB ịdapụ n'ihi ike mpụga.
5. Ehulata ụkpụrụ
PCB nwere ụfọdụ ụkpụrụ na-ehulata, n'ozuzu iji nweta ihe karịrị 25kg/mm
6. Ezi ọkụ eletrik
PCB dị ka onye na-ebu nke electronic components, iji nweta njikọ n'etiti components, na-adabere na PCB ahịrị na-eduzi, PCB kwesịrị ọ bụghị naanị nwere ezi eletriki conductivity, na PCB ahịrị gbajiri apụghị ozugbo kwachie elu, ma ọ bụ arụmọrụ nke dum ngwaahịa. ga-eme ka mmetụta dị ukwuu.
7. Nwere ike iguzogide ịsacha ihe mgbaze
PCB na mmepụta, mfe ka ruru unyi, mgbe mgbe mkpa na-asa osisi mmiri na ndị ọzọ solvents maka ihicha, otú PCB ga-enwe ike idi ihe mgbaze saa, na-enweghị na-emepụta egosipụta na ụfọdụ ndị ọzọ oghom Jeremaya mere.
Ndị a bụ ụfọdụ ihe achọrọ maka PCB tozuru oke na nhazi SMT.
Oge nzipu: Mar-11-2022