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Whakairi: Pepuere 15, 2022

Ngā Kāwai:Blogs

Tohu:pcb, pcbs, pcba, hui pcb, smt, stencil

 

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He aha te PCB Stencil?

Ko te PCB Stencil, e mohiotia ana ko Steel mesh, he rau stai

Te maitai kore me nga tuwhera tapahi taiaho whakamahia hei whakawhiti i te nui o te whakapiri konuhono ki te tuunga tika i runga i te PCB kore mo te whakanoho i nga waahanga o te mata.Ko te tito he anga titi, waea waea me te pepa rino.He maha nga kohao kei roto i te stencil, a ko nga waahi o enei kohao e rite ana ki nga waahi e tika ana kia taia ki te PCB.Ko te mahi matua o te stencil ko te whakatakoto tika i te nui o te whakapiri konuhono ki runga papa kia pai ai te hononga konuhono i waenga i te papa me te waahanga mo te hononga hiko me te kaha miihini.

A, no te i roto i te whakamahi, tuu te PCB i raro i te stencil, Kia te

he tika te tirohanga o te stencil ki runga o te papa, ka pania te whakapiri konuhono ki runga i nga tuwhera.

Na ka patai te whakapiri konuhono ki te mata o te PCB na roto i nga rua iti i te tuunga pumau i runga i te stencil.Ina wehea te konumohe rino mai i te papa, ka noho tonu te whakapiri konuhono ki te mata o te papa iahiko, kua rite mo te tuunga o nga taputapu whakapuru mata (SMD).Ko te iti o te whakapiri konuhia ka aukatihia ki te stencil, ka nui ake te whakatakoto ki runga i te PCB.Ka taea te tukurua tika tenei tukanga, na reira ka tere ake te mahi a te SMT me te riterite me te whakarite i te utu o te Runanga PCB.

He aha te hanga o te PCB Stencil?

Ko te nuinga o te stencil SMT he mea hanga ki te anga titi, mata me te

pepa kowiri tira, me te kāpia.Ko te anga stencil e whakamahia ana ko te anga e piri ana ki te waea waea me te kapia, he mea ngawari ki te whiwhi i te riipene rino o te ahua, he 35 ~ 48N / cm2.Ko te mata hei whakatika i te pepa rino me te anga.E rua nga momo mata, he kowiri tira waea me te polymer polyester mesh.Ka taea e te mea o mua te whakapumau me te nui o te awangawanga engari he ngawari ki te whakakino me te ngenge.Ko te muri engari ka taea te roa te whakataurite ki te mata waea kowiri tira.I te nuinga o te wa ka whakamahia te pepa stencil he 301, 304 ranei te pepa kowiri tira e tino pai ake ana te mahi o te stencil na roto i ona ahuatanga miihini pai.

 

Tikanga Hangahanga mo te Stencil

E whitu nga momo stensil me nga tikanga e toru mo te hanga stencils: chemical etching, laser cutting and electroforming.Ko te nuinga o te whakamahi he stencil maitai taiaho.Las

Ko te stencil te mea tino whakamahia i roto i te umanga SMT, e tohuhia ana ko:

Ka whakamahia tika te konae raraunga hei whakaiti i te hapa hangahanga;

Ko te tika o te whakatuwheratanga o te SMT stencil he tino tiketike: ko te hapa katoa o te tukanga ko ≤± 4 μm;

Ko te whakatuwheratanga o te SMT stencil he ahuahanga, he conduci

ve ki te tā me te niao o te whakapiri konuhono.

Te rere o te tukanga tapahi laser: te hanga kiriata PCB, te tango i nga taunga, te konae raraunga, te tukatuka raraunga, te tapahi laser, te huri.Ko te tukanga he tika te whakaputa raraunga me te iti o te awe o nga mea whainga;Ko te whakatuwheratanga trapezoidal he pai ki te whakaheke, ka taea te whakamahi mo te tapahi tika, te utu iti.

 

Nga whakaritenga me nga maataapono o te PCB Stencil

1. Ki te tiki i te tā tino o te whakapiri konuhono i runga i te papa PCB, te tūnga motuhake me te whakapūmautanga kia tino tika whakatuwheratanga, me te whakatuwheratanga kia i roto i tino rite ki te tikanga whakatuwhera i tohua tuku ki tohu fiducial.

2. Hei karo i nga hapa konuhono penei i te piriti me nga pirepire konutai, me hanga te whakatuwhera motuhake kia iti ake i te rahi o te papa PCB.kaua e neke ake i te 2mm te whanui katoa.Ko te waahi o te papa PCB me nui ake i te rua hautoru o te rohe o roto o te pakitara tuwhera o te stencil.

3. Ka totoro te mata, kia kaha te whakahaere, ka pa

y aro nui ki te awhe tuwhera, me whakapae me te whakatekau.

4. Ko te mata tuhi hei runga, ko te whakatuwheratanga o raro o te mata kia 0.01mm, 0.02mm ranei te whanui atu i te whakatuwheratanga o runga, ara, ko te whakatuwheratanga me huri koeko hei whakahaere i te tukunga pai o te whakapiri konuhono me te whakaiti i te horoi. nga wa o te stencil.

5. Me maeneene te pakitara mata.Ina koa mo te QFP me te CSP me te mokowhiti iti iho i te 0.5mm, ka hiahiatia te kaiwhakarato ki te whakahaere i te hiko hiko i te wa e mahi ana.

6. Ko te tikanga, ko te whakakitenga whakatuwhera stencil me te ahua o nga waahanga SMT he rite ki te papa, a ko te 1:1 te tauwehenga whakatuwhera.

7. Ko te matotoru tika o te pepa stencil e whakarite ana i te tukunga

o te nui e hiahiatia ana o te whakapiri solder i roto i te whakatuwheratanga.Ka taea e te taapiri konuhono he piriti konuhono i te mea ka iti ake te tuku konuhono ka ngoikore nga hononga konuhono.

 

Me pehea te hoahoa PCB Stencil?

1. 0805 e tūtohu ana kia tapahia nga papa e rua o te tuwhera ki te 1.0mm, katahi ka hanga i te porowhita concave B = 2 / 5Y;A = 0.25mm ranei he = 2 / 5 * l pirepire tine anti.

2. Te maramara 1206 me runga ake: i muri i te nekenga o nga papa e rua ki waho ma te 0.1mm, hanga he porowhita porowhita o roto B = 2 / 5Y;A = 2 / 5 * l maimoatanga pirepire tine anti.

3. Mo te PCB me te BGA, ko te ōwehenga whakatuwhera o te stencil me te mokowā pōro neke atu i te 1.0mm he 1:1, me te ōwehenga whakatuwhera o te stencil me te mokowā pōro iti iho i te 0.5mm he 1:0.95.

4. Mo te QFP me te SOP katoa me te 0.5mm pitch, te rati whakatuwhera

o i te ahunga whanui katoa he 1:0.8.

5. Ko te ōwehenga whakatuwhera i te ahunga roa ko te 1:1.1, me te 0.4mm pitch QFP, ko te whakatuwheratanga i te ahunga whanui katoa ko te 1:0.8, ko te whakatuwheratanga i te ahunga roa ko 1:1.1, me te waewae porohita o waho.Roowhio chamfer r = 0.12mm.Ko te katoa o te whakatuwheratanga o te huānga SOP me te 0.65mm pitch ka whakahekehia e te 10%.

6. Ina PLCC32 me PLCC44 o nga hua whaanui ka pokaia, ko te ahunga whanui katoa ko te 1:1 me te ahunga roa ko te 1:1.1.

7. Mo nga taputapu SOT whanui, ko te tauwehenga whakatuwhera

o te pito papa nui he 1:1.1, ko te ahunga whanui katoa o te pito papa iti he 1:1, ko te ahunga roa he 1:1.

 

Peheaki te whakamahi i te PCB Stencil?

1. Kia tupato te hapai.

2. Me horoi te stencil i mua i te whakamahinga.

3. Ko te whakapiri konupuku, ko te kapia whero ranei ka taurite.

4. Whakaritea te pehanga ta ki te pai.

5. Ki te whakamahi i te pepa pepa.

6. I muri i te whiunga o te whiu, he pai ki te whakamutu mo te 2 ~ 3 hēkona i mua i te whakakore, me te whakarite i te tere whakaheke kia kaua e tere rawa.

7. Me horoi i te wa tika, ka penapena pai i muri i te whakamahinga.

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Ratonga Hanga Stencil o PCB ShinTech

Ko te PCB ShinTech e tuku ana i nga ratonga hangahanga taiaho kowiri tira.Ka hangaia e matou he stencil me te matotoru o te 100 μm, 120 μm, 130μm, 150 μm, 180 μm, 200 μm, 250 μm me te 300 μm.Ko te konae raraunga e hiahiatia ana hei hanga i te stencil laser me whakauru he paparanga whakapiri SMT, he tohu tohu tohu, he paparanga whakahuahua PCB me te paparanga ahua, kia taea ai e tatou te tirotiro i nga taha o mua me muri o te raraunga, te waahanga waahanga, me era atu.

Mena kei te hiahia koe ki te tuku korero me tuku mai o konae me to patai kisales@pcbshintech.com.


Wā tuku: Hune-10-2022

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