He aha nā kūlana e pono ai kahi PCB kūpono?

I ka hoʻoili ʻana o SMT, nā substrates PCB ma mua o ka hoʻomaka ʻana o ka hoʻoili ʻana, e nānā ʻia ka PCB a hoʻāʻo ʻia, koho ʻia e hoʻokō i nā koi SMT hana o ka PCB, a hoʻihoʻi ʻole ʻia i ka mea hoʻolako PCB, hiki ke hāʻawi ʻia nā koi kikoʻī o ka PCB. IPc-a-610c International General Electronics Industry Assembly Standards, eia kekahi o nā koi kumu o ka hana SMT o PCB.

1. Pono ka PCB e palahalaha a pahee

ʻO nā koi maʻamau PCB palahalaha a maʻemaʻe, ʻaʻole hiki ke warp up, a i ʻole i ka paʻi solder paste a me ka hoʻokomo ʻana o ka mīkini SMT e hoʻopōʻino nui, e like me nā hopena o nā māwae.

2. Ka thermal conductivity

I ka reflow soldering machine a me ka nalu soldering machine, e loaʻa kahi preheat wahi, maʻamau e wela i ka PCB likely, a i kekahi mahana, o ka maikaʻi o ka thermal conductivity o ka PCB substrate, hua emi ino.

3. Kūleʻa wela

Me ka hoʻomohala ʻana o ke kaʻina hana SMT a me nā koi kaiapuni, ua hoʻohana nui ʻia ke kaʻina hana alakaʻi, akā ma muli o ka piʻi ʻana o ka wela welding, ke kū ʻana o ka wela o ka PCB i nā koi kiʻekiʻe, ke kaʻina alakaʻi i ka reflow soldering, pono ka mahana. hiki i ka 217 ~ 245 ℃, ka manawa mau 30 ~ 65s, no laila ke kūpaʻa wela PCB maʻamau i 260 degere Celsius, a me nā koi 10s hope loa.

4. ʻO ka hoʻopili ʻana o ke keleawe keleawe

Pono ka ikaika hoʻopaʻa ʻana o ka pahu keleawe i 1.5kg/cm² e pale ai i ka hāʻule ʻana o ka PCB ma muli o nā mana o waho.

5. Kūlou nā kūlana

Loaʻa i ka PCB kekahi mau kūlana kuʻi, maʻamau e hoʻokō ma mua o 25kg / mm

6. maikaʻi uila conductivity

ʻO ka PCB e like me ka lawe ʻana i nā ʻāpana uila, e hoʻokō i ka loulou ma waena o nā ʻāpana, e hilinaʻi i nā laina PCB e alakaʻi ai, ʻaʻole pono ka PCB i ka conductivity uila maikaʻi, a ʻaʻole hiki i nā laina PCB haki ʻia ke hoʻopili pololei, a i ʻole ka hana o ka huahana holoʻokoʻa. e hana i ka hopena nui.

7. Hiki ke pale i ka holoi holoi

ʻO ka PCB i ka hana ʻana, maʻalahi ka lepo, pono pinepine e holoi i ka wai papa a me nā mea ʻē aʻe no ka hoʻomaʻemaʻe ʻana, no laila e hiki i ka PCB ke kū i ka holoi holoi ʻana, me ka ʻole o ka hana ʻana i nā bubbles a me nā hopena ʻē aʻe.

ʻO kēia kekahi o nā koi kumu no kahi PCB kūpono i ka hana SMT.