ʻO ka nānā ʻana i ka maikaʻi o ka hui pū ʻana a me ka nānā ʻana

Me ka holomua o ka ʻepekema a me ka ʻenehana, nā kelepona paʻalima, nā kamepiula papa a me nā huahana uila ʻē aʻe he māmā, liʻiliʻi, hiki ke lawe ʻia no ke ʻano hoʻomohala, i ka hoʻoili ʻana o SMT o nā ʻāpana uila e liʻiliʻi ana hoʻi, ʻo nā ʻāpana capacitive 0402 mua he helu nui. o 0201 nui e pani.Pehea e hōʻoia ai i ka maikaʻi o nā hui solder i lilo i mea koʻikoʻi o ka SMD kiʻekiʻe.ʻO nā hui solder e like me ke alahaka no ka welding, ʻo kona maikaʻi a me ka hilinaʻi e hoʻoholo ai i ka maikaʻi o nā huahana uila.I nā huaʻōlelo ʻē aʻe, i ke kaʻina hana, ua hōʻike ʻia ka maikaʻi o SMT i ka maikaʻi o nā hui solder.

I kēia manawa, i ka ʻoihana uila, ʻoiai ua holomua nui ka noiʻi ʻana o ka solder lead-free a ua hoʻomaka i ka hoʻolaha ʻana i kāna noi ma ka honua holoʻokoʻa, a ua hopohopo nui ʻia nā pilikia kaiapuni, ʻo ka hoʻohana ʻana o Sn-Pb solder alloy soft brazing technology. i kēia manawa ka ʻenehana pili nui no nā kaapuni uila.

Pono ka hui solder maikaʻi i ka pōʻaiapuni o ke ola o ka mea hana, ʻaʻole i hāʻule ʻole kona ʻano mechanical a me nā uila.Hōʻike ʻia kona helehelena penei:

(1) He ʻili ʻālohilohi piha a paheʻe.

(2) ʻO ka nui kūpono o ka solder a me ka solder e uhi pono i nā pads a me nā alakaʻi o nā ʻāpana soldered, ʻo ke kiʻekiʻe o ke kiʻekiʻe.

(3) maikaʻi ka pulu;ʻO ka lihi o ka helu kūʻai ʻana he lahilahi, ʻoi aku ka maikaʻi o ka solder a me ka pā pad i ka 300 a i ʻole ka liʻiliʻi, ʻaʻole ʻoi aku ka nui ma mua o 600.

SMT kaʻina hana nānā ʻike maʻiʻo:

(1) nalo paha nā ʻāpana.

(2) Inā hoʻopili hewa ʻia nā ʻāpana.

(3) ʻAʻohe kaapuni pōkole.

(4) ina i ka virtual kuʻihao;ʻO ka wiliwili virtual he kumu paʻakikī.

I. ka hookolokolo ana o ka wili wahahee

1. ʻO ka hoʻohana ʻana i nā mea hoʻohana kūikawā pūnaewele no ka nānā ʻana.

2. Nānā a i ʻoleNānā AOI.I ka wa a ka solder ami i ike i ka liʻiliʻi loa solder solder pulu ino, a solder ami i ka waena o ka haʻihaʻi humuhumu, a solder ili he convex poepoe, a solder a me SMD ole honi fusion, etc., pono mākou e hoʻolohe i, ʻoiai ke ʻano o kahi pōʻino huna liʻiliʻi, pono e hoʻoholo koke inā aia kahi pūʻulu o nā pilikia soldering.ʻO ka hoʻokolokolo: e ʻike inā ʻoi aku ka nui o ka PCB ma ka wahi like o nā hui solder i nā pilikia, e like me nā pilikia PCB ponoʻī, hiki ke ʻoki ʻia ka paʻi solder, pin deformation a me nā kumu ʻē aʻe, e like me ka nui o ka PCB ma ka wahi like i nā pilikia, i kēia manawa he mea ʻino paha ia a i ʻole he pilikia i hana ʻia e ka pad.

II.ʻO nā kumu a me nā hoʻonā i ka welding virtual

1. Hoʻolālā pad hemahema.ʻO ka noho ʻana o ka pad through-hole he hemahema nui i ka hoʻolālā PCB, ʻaʻole pono, ʻaʻole hoʻohana, ma loko o ka lua e hana ai i ka nalowale o ka solder ma muli o ka lawa ʻole o ka solder;ʻO ke kaawale o ka pad, pono hoʻi e hoʻohālikelike ʻia ka ʻāpana, a i ʻole e hoʻoponopono koke ʻia e hoʻolālā.

2. He mea oxidation ka papa PCB, ʻo ia hoʻi, ʻaʻole mālamalama ka papa.Inā ʻo ke ʻano o ka oxidation, hiki ke hoʻohana ʻia ka lāʻau e holoi i ka papa oxide, i ʻike hou ʻia kona nani.pcb papa moisture, e like me ka mea i manaʻo ʻia hiki ke waiho ʻia i loko o ka umu hoʻomaloʻo.ʻO ka papa pcb ka ʻaila hinu, nā ʻōpala a me nā mea haumia ʻē aʻe, i kēia manawa e hoʻohana i ka ethanol anhydrous e hoʻomaʻemaʻe.

3. Paiʻia solder paste PCB, solder paste i ʻoki ʻia, ʻānai ʻia, no laila ka nui o ka solder paste ma nā pad kūpono e hoʻemi i ka nui o ka solder, no laila ʻaʻole lawa ka solder.Pono e hana ʻia i ka manawa kūpono.Loaʻa nā ala hoʻohui i ka dispenser a i ʻole e koho i kahi liʻiliʻi me kahi lāʻau ʻohe e hoʻopiha ai i ka piha.

4. SMD (nā ʻāpana i kau ʻia ma luna) o ka maikaʻi maikaʻi ʻole, ka pau ʻana, ka oxidation, deformation, ka hopena i ke kūʻai hewa ʻana.ʻO kēia ke kumu maʻamau.

ʻAʻole ʻōlinolino nā ʻāpana oxidized.Piʻi ka helu heheʻe o ka oxide.

I kēia manawa me ka ʻoi aku o ʻekolu haneli degere o nā degere o ka hao chromium uila a me ke ʻano rosin-type flux hiki ke welded, akā me ka ʻoi aku ma mua o ʻelua haneli degere o SMT reflow soldering me ka hoʻohana ʻana i ka paʻi solder hoʻomaʻemaʻe liʻiliʻi. hehee.No laila, ʻaʻole pono e kūʻai ʻia ka SMD oxidised me ka umu reflow.Pono e kūʻai i nā ʻāpana e ʻike inā he oxidation, a kūʻai hou i ka manawa e hoʻohana ai.Pēlā nō, ʻaʻole hiki ke hoʻohana ʻia ka paʻi solder oxidised.