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nkhani

Adalemba: Feb 15, 2022

Magulu:Mabulogu

Tags:pcb, pcbs, pcba, pcb assembly, smt, stencil

 

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Kodi PCB Stencil ndi chiyani?

PCB Stencil, yomwe imadziwikanso kuti Steel mesh, ndi pepala la stai

chitsulo chopanda chitsulo chokhala ndi ma laser odula otsegula omwe amagwiritsidwa ntchito kusamutsa kuchuluka kolondola kwa phala la solder kumalo olondola osankhidwa pa PCB yopanda kanthu kuti akhazikitse zida zapamtunda.Cholemberacho chimapangidwa ndi chimango cha stencil, waya wa waya ndi pepala lachitsulo.Pali mabowo ambiri mu stencil, ndipo malo a mabowowa amagwirizana ndi malo omwe amafunika kusindikizidwa pa PCB.Ntchito yayikulu ya stencil ndikuyika molondola kuchuluka kwa solder pamatope kuti cholumikizira cha solder pakati pa pedi ndi chigawocho chikhale changwiro potengera kulumikizidwa kwamagetsi ndi mphamvu zamakina.

Mukagwiritsidwa ntchito, ikani PCB pansi pa stencil, Kamodzi

stencil imayikidwa bwino pamwamba pa bolodi, phala la solder limayikidwa pamwamba pa zotsegula.

Ndiye solder phala ndi zinawukhira kwa PCB pamwamba kudzera mabowo ang'onoang'ono pa malo okhazikika pa stencil.Pamene zitsulo zojambulazo zimasiyanitsidwa ndi bolodi, phala la solder lidzakhalabe pamwamba pa bolodi la dera, lokonzekera kuyika zipangizo zokwera pamwamba (SMDs).Phala locheperako limatsekedwa pa stencil, m'pamenenso limayikidwa pa PCB.Njirayi ikhoza kubwerezedwa molondola, kotero imapangitsa kuti ndondomeko ya SMT ikhale yofulumira komanso yowonjezereka ndikuwonetsetsa kuti PCB Assembly ndi yotsika mtengo.

Kodi PCB Stencil imapangidwa ndi chiyani?

Cholembera cha SMT chimapangidwa makamaka ndi chimango cha stencil, mesh ndi

pepala lachitsulo chosapanga dzimbiri, ndi zomatira.Nthawi zambiri chimango cha stencil ndi chimango chomata pa mauna a waya ndi guluu, chomwe chimakhala chosavuta kupeza chitsulo chachitsulo chofanana, chomwe nthawi zambiri chimakhala 35 ~ 48N / cm2.Mesh ndi yokonza zitsulo ndi chimango.Pali mitundu iwiri ya mauna, zitsulo zosapanga dzimbiri waya mauna ndi polymer polyester mauna.Zakale zimatha kupereka kukhazikika kokhazikika komanso kokwanira koma kosavuta kupunduka ndikutha.Kenako imatha nthawi yayitali poyerekeza ndi waya wachitsulo chosapanga dzimbiri.Pepala la stencil lomwe nthawi zambiri limatengedwa ndi 301 kapena 304 zitsulo zosapanga dzimbiri zomwe mwachiwonekere zimawongolera magwiridwe antchito a stencil kudzera pamakina ake abwino kwambiri.

 

Njira Yopangira Stencil

Pali mitundu isanu ndi iwiri ya ma stencil ndi njira zitatu zopangira ma stencil: etching mankhwala, kudula laser ndi electroforming.Nthawi zambiri ntchito ndi laser zitsulo stencil.Las

er stencil ndi yomwe imagwiritsidwa ntchito kwambiri mumakampani a SMT, omwe amadziwika kuti:

Fayilo ya data imagwiritsidwa ntchito mwachindunji kuchepetsa zolakwika zopanga;

Kulondola kwa malo a SMT stencil ndikokwera kwambiri: cholakwika chonsecho ndi ≤± 4 μ m;

Kutsegula kwa stencil ya SMT kuli ndi geometry, yomwe ndi conduci

kusindikiza ndi kuumba kwa solder phala.

Laser kudula ndondomeko otaya: filimu kupanga PCB, kutenga kugwirizana, deta wapamwamba, processing deta, laser kudula, akupera.Njirayi ili ndi kulondola kwakukulu kwa kupanga deta komanso mphamvu zochepa za zolinga;Kutsegula kwa trapezoidal kumathandizira kugwetsa, kumatha kugwiritsidwa ntchito podula molondola, kutsika mtengo.

 

General zofunika ndi mfundo za PCB Stencil

1. Kuti mupeze chosindikizira changwiro cha solder phala pa PCB pads, malo enieni ndi specifications adzaonetsetsa mkulu kutsegula molondola, ndipo kutsegulira adzakhala mosamalitsa motsatira njira yotsegulira yotchulidwa zizindikiro fiducial.

2. Kupewa zopindika solder ngati mlatho ndi solder mikanda, paokha kutsegula adzakhala cholinga ang'onoang'ono kuposa PCB PAD kukula.m'lifupi wonse sayenera kupitirira 2mm.Dera la PCB pad nthawi zonse liyenera kukhala lalikulu kuposa magawo awiri pa atatu a malo amkati mwa khoma lotsekera la stencil.

3. Mukamatambasula mauna, muziwongolera mwamphamvu, ndi pa

y chidwi chapadera pazotsegulira, zomwe ziyenera kukhala zopingasa komanso zokhazikika.

4. Ndi malo osindikizira ngati pamwamba, kutsegula m'munsi kwa mauna kudzakhala 0.01mm kapena 0.02mm m'lifupi kuposa kutsegula kumtunda, ndiko kuti, kutsegula kudzakhala kosinthika kuti athetse kumasulidwa kwa solder phala ndi kuchepetsa kuyeretsa. nthawi za stencil.

5. Khoma la mauna liyenera kukhala losalala.Makamaka pa QFP ndi CSP yokhala ndi mipata yochepera 0.5mm, woperekayo amafunikira kuti aziyendetsa magetsi panthawi yopanga.

6. Kawirikawiri, kutsegulira kwa stencil ndi mawonekedwe a zigawo za SMT zimagwirizana ndi pad, ndipo chiwerengero chotsegulira ndi 1: 1.

7. Kukula kolondola kwa pepala la stencil kumatsimikizira kumasulidwa

kuchuluka komwe mukufuna solder phala kudzera kutsegula.Kuyika kowonjezera kwa solder kumatha kuyambitsa bridging ya solder pomwe kuyika kocheperako kungayambitse mafupa ofooka a solder.

 

Momwe mungapangire Stencil ya PCB?

1. 0805 phukusi tikulimbikitsidwa kudula ziyangoyango ziwiri za kutsegula ndi 1.0mm, ndiyeno kupanga concave bwalo B = 2 / 5Y;A = 0.25mm kapena = 2/5 * l anti tini mkanda.

2. Chip 1206 ndi pamwamba: pambuyo pa mapepala awiriwo atasunthira kunja ndi 0.1mm motsatira, pangani bwalo lamkati la concave B = 2 / 5Y;A = 2/5 * l mankhwala a anti tini.

3. Pakuti PCB ndi BGA, ndi kutsegula chiŵerengero cha stencil ndi mpira katayanitsidwe oposa 1.0mm ndi 1:1, ndi kutsegula chiŵerengero cha stencil ndi mpira katayanitsidwe zosakwana 0.5mm ndi 1:0.95.

4. Kwa onse a QFP ndi SOP okhala ndi 0.5mm pitch, rati yotsegulira

o m'lifupi mwake ndi 1:0.8.

5. Chiŵerengero chotsegulira mu njira yautali ndi 1: 1.1, ndi 0.4mm phula QFP, kutsegulira mu njira yonse ya m'lifupi ndi 1: 0.8, kutsegulira kwa kutalika ndi 1: 1.1, ndi phazi lozungulira lakunja.Chamfer radius r = 0.12mm.Kutsegulira kwathunthu kwa chinthu cha SOP chokhala ndi phula la 0.65mm kumachepetsedwa ndi 10%.

6. Pamene PLCC32 ndi PLCC44 ya zinthu wamba ndi perforated, okwana m'lifupi malangizo ndi 1: 1 ndi kutalika malangizo 1:1.1.

7. Pazida zophatikizika za SOT, kuchuluka kotsegulira

Kumapeto kwa pad yayikulu ndi 1: 1.1, m'lifupi mwake mbali zonse zapang'ono ndi 1: 1, ndi kutalika kwake ndi 1: 1.

 

BwanjiKugwiritsa Ntchito Stencil ya PCB?

1. Gwirani mosamala.

2. Stencil iyenera kutsukidwa musanagwiritse ntchito.

3. Phala la solder kapena guluu wofiira lidzagwiritsidwa ntchito mofanana.

4. Sinthani kukakamiza kosindikiza kukhala kopambana.

5. Kugwiritsa ntchito pasteboard yosindikiza.

6. Pambuyo pa scraper stroke, ndibwino kuti muyime kwa 2 ~ 3 masekondi musanayambe kugwetsa, ndikuyimitsa kuthamanga kwachangu osati mofulumira kwambiri.

7. Stencil iyenera kutsukidwa mu nthawi, kusungidwa bwino pambuyo ntchito.

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Stencil Manufacture Service ya PCB ShinTech

PCB ShinTech imapereka ntchito zopangira ma stencil achitsulo osapanga dzimbiri.Timapanga ma stencil okhala ndi makulidwe a 100 μm, 120 μm, 130µm, 150 μm, 180 μm, 200 μm, 250 μm ndi 300 μm.Fayilo ya data yofunikira kuti mupange stencil ya laser iyenera kukhala ndi SMT solder phala wosanjikiza, data fiducial mark, PCB autilaini wosanjikiza ndi wosanjikiza khalidwe, kotero ife tikhoza kuyang'ana kutsogolo ndi kumbuyo mbali deta, chigawo gulu, etc.

Ngati mukufuna mtengo, chonde tumizani mafayilo anu ndikufunsasales@pcbshintech.com.


Nthawi yotumiza: Jun-10-2022

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