(1) Ụkpụrụ nkereflow soldering
N'ihi na-aga n'ihu miniaturization nke electronic ngwaahịa PCB mbadamba, mgbawa components apụtawo, na omenala ịgbado ọkụ ụzọ enwebeghị ike gboo mkpa.A na-eji reflow soldering na mgbakọ nke ngwakọ agbakwunyere mbadamba sekit, na ọtụtụ n'ime ihe ndị na-agbakọta na welded bụ mgbawa capacitors, mgbawa inductor, ndokwasa transistor na diodes.Site na mmepe nke teknụzụ SMT dum na-aghọwanye nke zuru oke, mpụta nke ụdị mgbawa dị iche iche (SMC) na ngwaọrụ na-arị elu (SMD), teknụzụ na akụrụngwa reflow soldering dị ka akụkụ nke teknụzụ na-arị elu ka emepụtara ya. , na ngwa ha na-abawanye ụba.etinyere ya n'ihe fọrọ nke nta ka ọ bụrụ mpaghara ngwaahịa eletrọnịkị niile.Reflow soldering bụ a rọrọ solder nke na-aghọta na n'ibu na eletriki njikọ n'etiti solder nsọtụ nke elu ndokwasa components ma ọ bụ atụdo na e biri ebi osisi pads site remelting na mado-kwajuru solder nke na-ebu ụzọ ekesa na e biri ebi mbadamba.weld.Ịghagharị ihe na-ere ihe na bọọdụ PCB, na reflow soldering bụ ịkwanye ngwaọrụ n'elu.Ntugharị ịgbagharị na-adabere n'omume nke ikuku na-ekpo ọkụ na nkwonkwo na-ere ahịa, na jelii-dị ka flux na-enweta mmeghachi omume anụ ahụ n'okpuru ụfọdụ ikuku ikuku dị elu iji nweta SMD soldering;ya mere a na-akpọ ya "reflow soldering" n'ihi na gas na-ekesa na igwe ịgbado ọkụ iji mepụta okpomọkụ dị elu iji nweta nzube nke soldering..
(2) Ụkpụrụ nkereflow solderingigwe na-ekewa n'ime ọtụtụ nkọwa:
A. Mgbe PCB abanye kpo oku mpaghara, ihe mgbaze na gas na solder mado evaporate.N'otu oge ahụ, mmụgharị dị na tapawa solder na-edobe pads ahụ, ọnụ ọnụ akụrụngwa na ntụtụ, na tapawa solder na-adarọ, daa, na-ekpuchikwa tapawa ahụ.efere iji kewapụ mpe mpe akwa na ntụtụ akụrụngwa sitere na oxygen.
B. Mgbe PCB na-abanye na ebe nchekwa okpomọkụ, PCB na components na-ekpo ọkụ zuru oke iji gbochie PCB na mberede ịbanye na mpaghara okpomọkụ dị elu nke ịgbado ọkụ na imebi PCB na components.
C. Mgbe PCB na-abanye n'ebe ịgbado ọkụ, okpomọkụ na-ebili ngwa ngwa nke mere na tapawa solder rute ala gbazere, na mmiri mmiri solder wets, na-agbasa, gbasaa, ma ọ bụ reflows na pads, akụrụngwa njedebe na atụdo nke PCB na-etolite solder nkwonkwo. .
D. PCB na-abanye na mpaghara jụrụ oyi iji mee ka nkwonkwo solder sie ike;mgbe reflow soldering agwụla.
(3) Usoro chọrọ makareflow solderingigwe
Nkà na ụzụ reflow reflow abụghị nke a ma ama n'ọhịa nke nrụpụta eletrọnịkị.A na-eresị ihe ndị dị na bọọdụ dị iche iche eji na kọmpụta anyị na bọọdụ sekit site na usoro a.Uru nke usoro a bụ na okpomọkụ dị mfe ịchịkwa, enwere ike ịzere oxidation n'oge usoro ire ere, na ọnụ ahịa nrụpụta dị mfe ịchịkwa.Enwere sekit na-ekpo ọkụ n'ime ngwaọrụ a, nke na-eme ka ikuku nitrogen na-ekpo ọkụ na okpomọkụ zuru oke ma na-efesa ya na bọọdụ sekit ebe a na-ejikọta ihe ndị ahụ, nke mere na ihe na-agbaze n'akụkụ abụọ nke ihe ndị ahụ gbazere wee jikọta ya na motherboard. .
1. Tọọ profaịlụ okpomọkụ reflow reflow ma na-eme nnwale nke profaịlụ okpomọkụ oge niile.
2. Weld dị ka ntụziaka ịgbado ọkụ nke PCB imewe.
3. Kwụsị igbochi eriri ebufe ka ọ ghara ịma jijiji n'oge usoro ịgbado ọkụ.
4. A ghaghị ịlele mmetụta ịgbado ọkụ nke bọọdụ e biri ebi.
5. Ma ịgbado ọkụ zuru ezu, ma elu nke solder nkwonkwo bụ ezigbo, ma ọdịdị nke solder nkwonkwo bụ ọkara ọnwa, ọnọdụ nke solder bọọlụ na residues, ọnọdụ nke na-aga n'ihu ịgbado ọkụ na mebere ịgbado ọkụ.Lelee PCB n'elu agba mgbanwe na na.Ma dozie usoro okpomọkụ dị ka nsonaazụ nyocha si dị.Ekwesịrị ịlele ogo ịgbado ọkụ mgbe niile n'oge nrụpụta.
(4) Ihe ndị na-emetụta usoro nlọghachi:
1. Na-emekarị PLCC na QFP nwere ikike okpomọkụ ka ukwuu karịa ihe mgbawa pụrụ iche, ọ na-esikwa ike ịgbanye nnukwu mpaghara karịa obere ihe.
2. Na oven reflow, eriri ebufe na-aghọkwa usoro ikpo ọkụ ọkụ mgbe ngwaahịa ndị a na-ebugharị na-emegharị ugboro ugboro.Tụkwasị na nke ahụ, ọnọdụ ikpo ọkụ na-ekpo ọkụ na nsọtụ na etiti nke ikpo ọkụ dị iche iche, na okpomọkụ dị na nsọtụ dị ala.Na mgbakwunye na ihe dị iche iche chọrọ, okpomọkụ nke otu loading elu dị iche iche.
3. Mmetụta nke loading ngwaahịa dị iche iche.Ndozi nke profaịlụ okpomọkụ nke reflow soldering kwesịrị iburu n'uche na enwere ike nwetaghachi ezigbo nkwughachi n'okpuru enweghị ibu, ibu na ihe dị iche iche dị iche iche.A kọwapụtara ihe ibu dị ka: LF=L/(L+S);ebe L = ogologo nke ihe ejikọtara ọnụ na S = oghere nke mkpụrụ osisi gbakọtara.Ihe dị elu nke ibu ibu, otú ahụ ka ọ na-esikwu ike inweta nsonaazụ ndị nwere ike imegharị maka usoro nlọghachi.Ọtụtụ mgbe, ihe kachasị ibu nke oven reflow bụ 0.5 ~ 0.9.Nke a na-adabere na ngwaahịa ọnọdụ (mpaghara soldering njupụta, dị iche iche substrates) na dị iche iche ụdị nke reflow oven.Ahụmahụ bara uru dị mkpa iji nweta nsonaazụ ịgbado ọkụ dị mma yana nkwụghachi.
(5) Gịnị bụ uru nkereflow solderingteknụzụ igwe?
1) Mgbe ị na-eji teknụzụ reflow reflow na-ere ahịa, ọ dịghị mkpa itinye bọọdụ sekit e biri ebi na solder a wụrụ awụ, mana a na-eji kpo oku mpaghara mechaa ọrụ ire ere;ya mere, ihe ndị a ga-eresị na-enwe obere ujo na-ekpo ọkụ na agaghị eme ya site na oke ikpo ọkụ na-emebi ihe.
2) Ebe ọ bụ na teknụzụ ịgbado ọkụ naanị kwesịrị itinye solder na akụkụ ịgbado ọkụ ma kpoo ya na mpaghara iji mezue ịgbado ọkụ ahụ, a na-ezere ntụpọ ịgbado ọkụ dị ka ịgbado ọkụ.
3) Na teknụzụ usoro ịgbazigharị reflow, a na-eji ihe eji eme ihe naanị otu ugboro, ọ nweghịkwa eji ya eme ihe, ya mere onye na-ere ya dị ọcha na enweghị ihe adịghị ọcha, nke na-eme ka ọ dị mma nke nkwonkwo na-ere ahịa.
(6) Okwu mmalite nke usoro eruba nkereflow solderingigwe
Usoro ire ere nke reflow bụ bọọdụ mgbago elu, usoro ya na-agbagwoju anya karị, nke enwere ike kewaa n'ụdị abụọ: nrụnye otu akụkụ na nrụnye ihu abụọ.
A, otu akụkụ arịọnụ: tupu mkpuchi solder mado → patch (kewara n'ime ntuziaka arịọnụ na igwe akpaka arịọnụ) → reflow soldering → nnyocha na eletriki ule.
B, Ugboro abụọ n'ịgbakwasị: Pre- mkpuchi mkpuchi solder mado n'akụkụ → SMT (kewara n'ime akwụkwọ ntuziaka na ntinye igwe akpaaka) → reflow soldering → Pre- mkpuchi mkpuchi solder mado n'akụkụ B → SMD (kewara n'ime akwụkwọ ntuziaka na ntinye igwe akpaka). ) ntinye) → reflow soldering → nyocha na ule eletriki.
Usoro dị mfe nke reflow soldering bụ “screen printing solder paste — patch — reflow soldering, nke bụ isi nke bụ izi ezi nke silk screen obibi, na mkpụrụ ọnụego na-ekpebisi ike site PPM nke igwe maka patch soldering, na reflow soldering bụ. iji chịkwaa ịrị elu okpomọkụ na oke okpomọkụ.na usoro okpomọkụ na-ebelata."
(7) Reflow soldering igwe akụrụngwa mmezi usoro
Ọrụ nlekọta nke anyị na-aghaghị ịrụ mgbe ejiri reflow soldering;ma ọ bụghị ya, ọ na-esiri ike ịnọgide na-arụ ọrụ ndụ nke akụrụngwa.
1. A ga-enyocha akụkụ ọ bụla kwa ụbọchị, ma tinye uche pụrụ iche na eriri ebuga, ka ọ ghara ịrapara ma ọ bụ dapụ.
2 Mgbe ị na-emegharị igwe, a ga-agbanyụ ọkụ eletrik iji gbochie ujo ọkụ eletrik ma ọ bụ obere sekit.
3. Igwe ahụ ga-eguzosi ike na ọ bụghị tilted ma ọ bụ ejighị n'aka
4. N'ihe banyere mpaghara okpomọkụ nke onye ọ bụla na-akwụsị ikpo ọkụ, buru ụzọ chọpụta na fuse nke kwekọrọ na-ekesa na PCB pad site na ịmegharị paste ahụ.
(8) Akpachara anya maka igwe na-agbagharị agbagharị
1. Iji hụ na nchekwa nke onwe onye, onye ọrụ ga-ewepụ akara na ihe ịchọ mma, na uwe aka ekwesịghị ịdị oke.
2 Lezienụ anya na okpomọkụ dị elu mgbe ị na-arụ ọrụ iji zere mmezi ọkụ
3. Adịghị aka ike ịtọ okpomọkụ mpaghara na ọsọ nkereflow soldering
4. Gbaa mbọ hụ na ụlọ ahụ na-eku ume, na onye na-ewepụta uzuzu kwesịrị iduga n'èzí nke windo.
Oge nzipu: Sep-07-2022