O le kelu mumu o se vaega o le polyene. E le pei o le paʻu faʻapipiʻi, e faʻamaloloina pe a vevela. O lona maluluina vevela o le 150 ℃, i lenei taimi, kelu mumu amata ona avea mausali tuusao mai faapipii. O le kelu mumu e a le SMT mea. Lenei tusitusiga o le a taialaina oe ia malamalama i le mea o mumu kelu i Laupapa PCB, o le a le matafaioi a le kelu mumu i luga o le PCB, o le matafaioi a le kelu mumu i le PCB SMT gaosiga ma le SMT mumu kelu faʻagasologa masani.

O le a le kelu mumu i luga o le laupapa PCB?

I SMT ma DIP fefiloi gaioiga, ina ia aloese tasi-itu faʻaali lasina tasi, galu faʻapipiʻi faʻalua faʻalua luga o le ogaumu tulaga, i le PCB galu soldering luga malamala vaega, o le ogatotonu o le masini vaʻaia kelu mumu, mafai ona faʻapipiʻi tasi luga apa, sefe le solder faapipii lolomiina gaioiga.

SMT “kelu mumu” gaioiga? O le mea moni, o le igoa saʻo e tatau ona avea SMT “dispensing” gaioiga. O le tele o mea faapipii e mumu, o lea e masani ai ona taʻua o le “red adhesive”. O le mea moni, o loʻo i ai foʻi le pipiʻi samasama, lea e tutusa ma tatou masani ona faʻaigoaina o le “solder mask” i luga o le matagaluega laupapa “lanumeamata vali”.

O le a le kelu mumu i luga o le laupapa PCB? O le a le aoga a le kelu mumu i le PCB?

E mafai ona matou iloa o loʻo i ai le faʻaputuga o kelu mumu i le ogatotonu o tamaʻi vaega o resistors ma capacitors. Ole kelu mumu lea. O le kelu mumu gaioiga na atiaʻe ona e tele eletise elemeni e le mafai ona vave faʻamavae mai le afifi muamua DIP i le SMD afifi.

O le laupapa matagaluega ei ai le afa o le DIP vaega ma le afa o le SMD vaega. Faʻafefea ona e tuʻuina ia vaega ina ia mafai ai ona latou otometi uʻamea i le laupapa? O le masani masani o le mamanuina uma o le DIP ma SMD vaega i le tutusa itu o le laupapa. O vaega SMD o loʻo lolomiina i le faʻapipiʻi ona toe faʻapipiʻi lea i le ogaumu. O totoe o le DIP vaega e mafai ona uʻamea uma i le taimi e tasi e faʻaogaina ai le galu soldering ogaumu gaioiga ona o pine uma e faʻaalia i le isi itu o le laupapa. Ma matou te manaʻomia ni sitepu uʻamea se lua ile amataga e faʻamaopoopoina mea uma.

Ina ia mafai ona sefe PCB faʻatulaga avanoa, matou te faʻamoemoe e tuʻuina atu tele vaega i totonu. O le mea lea, SMT masini e manaʻomia foi ona tuʻu i luga o le pito i lalo. Ina ia mafai ona faapipii vaega i le matagaluega laupapa ma ia maua le matagaluega laupapa i totonu o le Wave Soldering ogaumu, e faapipii latou i le soldering pad ma aua le pa’ū i totonu o le vevela Wave soldering ogaumu.

Ina ia mafai ona faʻaititia le tekinolosi faʻagasologa, matou te faʻamoemoe e faʻamaeʻaina le uelo i le tasi taimi. E mafai, e ala ile pu, e mafai ona faʻapipiʻi, ae ole toʻatele o a matou plugini e le mafai gafatia le maualuga ole vevela ole faʻapipiʻi. O le mea lea, o le-hole reflow welding e le mafai. O le mea lea, e mafai ai ona mafaufau i le faʻaaoga o le faʻaaogaina o le uelo mo le tele o oloa a nisi kamupani tetele, aua e mafai ona latou faʻatauina ni vaega o mea taugata e mafai ona tatalia le vevela o le tau.

Ma lautele SMD vaega ona ua fuafuaina e tatalia le vevela o le toe faʻapipiʻi, faʻaalu soldering vevela e maualuga atu nai lo le galu soldering vevela, o lea o le SMD vaega totoe i galu soldering apa ogaumu, e tusa lava mo se puʻupuʻu taimi o taimi e leai foi ni faʻafitauli , ae leai se auala e faia ai le lolomi faʻapipiʻi faʻapipiʻi SMD ogaumu soldering galu, ona o le apa ogaumu vevela e tatau ona maualuga atu nai lo le faʻaliusuavai vevela o le faʻapipiʻi faʻapipiʻi, Lenei o le a mafua ai le SMD vaega e liusuavai ma pa’ū i totonu o le apa ogaumu.

O le mea lea, e tatau ona tatou faʻaleleia muamua le masini SMD, o lea tatou te faʻaaogaina ai le kelu mumu.

Ole a le matafaioi ole kelu mumu ile PCB?

1. O kelu mumu e masani ona faʻatinoina se vaega tumau ma se faʻapopotoga. Soldering o le maopoopo moni.

2. Faʻamau solo e puipuia ai vaega mai le paʻu ese (galu soldering process). Pe a faʻaaogaina le soldering galu, o le vaega ua faʻamau i le lolomi laupapa e puipuia ai le vaega mai le paʻu ese a o le laupapa pasi atu i le solder mataafi.

3. Reflow uelo e puipuia ai le isi itu o le vaega pa’ū ese (lua-itu faʻaata lasina faʻagasologa). I le faʻalua-itu faʻaopoopo lasina faʻagasologa, e puipuia ai le tele masini i le itu uʻamea mai pa’ū ese ona o le vevela liusuavai o le solder, e tatau ona i ai SMT pipiʻi.

4. Puipui vaega mai le faʻaseʻeina ma le tu (faʻasolosolo uelo faʻagasologa, muamua-ufiufi faʻagasologa). Faʻaaogaina i le faʻasolosolo uelo faʻagasologa ma precoating gaioiga e puipuia ai le faʻaseʻeina ma faʻasolosolo ipu i le taimi o faʻapipiʻiina.

5, maka (galu soldering, reflow uelo, precoating). I se faʻaopopoga, lolomi laupapa ma vaega vaega suiga, ma patch pipiʻi mo faʻailoga.

O le a le matafaioi a le kelu mumu i le PCB patch gaosi?

Patch gaosi sooupu o patch foi gaioiga kelu mumu, masani mumu (samasama pe papaʻe) faʻapipiʻi tutusa tufatufa hardener, pigment, solvent ma isi pipiʻi, tele faʻaaogaina e fofo vaega faʻatulagaina faʻamau i luga o le lolomi laupapa, masani tufatufaina poʻo uamea screen lolomi metotia e tufatufaina . Faʻapipiʻi vaega ma tuʻu i totonu o le ogaumu poʻo le ogaumu o le ogaumu e faʻaola ma faʻamaʻaʻa ai.

Patch gaosi pipiʻi pipiʻi o le vevela pe a maeʻa ona faʻamālōlōina, patch faʻagasolo faʻamautuina o le vevela e masani lava 150 tikeri, toe faʻasolosolo e le liusuavai, o lona uiga, o le patch gaosi vevela faʻamaʻaina faʻagasologa e le mafai ona toe faʻafoʻi. O le gaioiga aafiaga o le patch o le a ese ona o le vevela faʻamaloloina tulaga, o le fesoʻotaʻiga, meafaigaluega faʻaaogaina, ma le siosiomaga faʻagaioiga. O le mea faapipii faapipii tatau ona filifilia e tusa ai ma le lolomi lolomi laupapa laupapa () gaioiga.

Patch gaosi mumu kelu o se vailaʻau tuʻufaʻatasia, mafuli aofia ai o polymer mea. Faʻapipiʻi gaosi mea faʻatumu, faʻamaloloina sooupu, isi faʻaopoopoga, ma isi Patch gaosi pipiʻi mumu pipiʻi o viscosity fluidity, vevela uiga, wetting uiga ma isi. E tusa ai ma uiga o kelu mumu i le SMT gaioiga, o le mafuaʻaga o le faʻaaogaina mumu kelu i le gaosiga o le faia o vaega pipii mau luga o le PCB luga ma puipuia mai le paʻu ese.

Patch gaosi kelu mumu o se mama taumafaina mea, e le o se oloa talafeagai o le gaioiga, nei ma le faifai pea o le faʻaleleia o luga luga faʻatuina tisaini ma tekonolosi, patch faʻagasologa e ala i le faʻaaogaina o le pu, ua faʻaluaina itu faʻaaogaina faʻamamaina, o le faʻaaogaina o patch faʻagasologa patch pipiʻi faʻapipiʻi gaioiga e laititi ma laititi le masani.

SMT mumu kelu faʻasologa masani

SMT mumu kelu gaosiga tulaga masani o le: lolomiga lolomi → (tufatufaina) → faʻapipiʻiina → (faʻamaloloina) → faʻasolosolo uʻamea → faʻamamaina → mauaina → faʻaleleia → maeʻa.

1. Lau lolomi: o lana galuega o le lolomi faʻapipiʻi faʻapipiʻi (solder paste) pe kelu mumu (patch kelu) i luga o le solder pad o le laupapa matagaluega PCB e sauniuni ai mo le faʻamaopoopoina o vaega. O masini e faʻaaogaina o le masini lolomitusi (screen masini lolomi), o loʻo tu i le pito i luma o laina gaosi SMT.

2. Faʻasoasoaina: o le mumu kelu itu i le tulaga faʻamau o le PCB, o lona autu matafaioi o le faʻaleleia o vaega i le laupapa PCB. O le masini tufatufaina o loʻo tu i le pito i luma o le SMT gaosiga laina pe i tua o le suʻega masini.

3. Faʻaputuga: o lana gaioiga o le faʻapipiʻiina o vaega o faʻapotopotoga i luga o le tulaga faʻamautu o le PCB. O mea faigaluega o loʻo faʻaaogaina o le masini SMT, e tu i tua atu o le masini lolomitusi i le laina gaosi SMT.

4. Faʻamaloloina: o lana matafaioi o le faʻaliusuavai le kelu mumu (pipiʻi pipiʻi), ina ia mafai ai ona fusia faʻatasi vaega o le faʻapotopotoga i luga ma le laupapa PCB. O mea faigaluega na faʻaaogaina o le ogaumu faʻamama, o loʻo tu i tua atu o le masini SMT i le laina SMT.

5. Reflow uelo: o lana gaioiga o le liusuavai faʻapipiʻi faʻapipiʻi (solder faapipii), ina ia mafai ai ona fusia faʻatasi vaega o le faʻapotopotoga i luga ma le laupapa PCB. O le ogaumu ogaumu o loʻo tu i tua atu o le SMT masini i le laina SMT.

6. Faʻamamaina: o lana gaioiga o le aveʻese uʻamea toe faʻapipiʻi e pei o fluks lea e afaina ai le tino o le tagata luga potopoto laupapa PCB. O masini e faʻaaoga o le masini faʻamama, o le tulaga e le mafai ona faʻaleleia, mafai ona i luga ole laiga, e le mafai foi ona i luga ole laiga.

7. Mauaina: o lana gaioiga o le sailia o le lelei uʻamea ma le lelei potopoto o potopoto laupapa PCB. O le mea faigaluega faʻaaogaina o le faʻateleina tioata, microscope, on-line test instrument (ICT), lele nila nila mea fai faʻataʻitaʻi, otometi tofotofoga opitika (AOI), X-ray faʻataʻitaʻiga suʻega, aoga mea faigaluega suʻega, ma isi. Tulaga e tusa ai ma asiasiga manaʻoga, mafai ona configure i le gaosiga laina i le talafeagai nofoaga.

8. Faʻaleleia: o lana matafaioi o le sailia o le le manuia o le PCB laupapa mo rework. O le autu mea faigaluega faʻaaogaina o vevela fana, uʻamea faʻapipiʻi, toe faʻaleleia nofoaga faigaluega, ma isi. E mafai ona faʻapipiʻi i soʻo se mea i le laina gaosi.