Nyob rau hauv tus txheej txheem ntawmPCBkev tsim khoom, kev tsim khoom ntawm aSteel Stencil (tseem hu ua "stencil")yog nqa tawm kom raug siv solder paste mus rau solder paste txheej ntawm PCB.Cov txheej nplaum nplaum, tseem hu ua "paste npog txheej," yog ib feem ntawm PCB tsim cov ntaub ntawv siv los txhais cov haujlwm thiab cov duab ntawmsolder muab tshuaj txhuam.Cov txheej no yog pom ua ntej lubQhov chaw mount technology (SMT)Cheebtsam yog soldered mus rau PCB, qhia qhov twg cov solder muab tshuaj txhuam yuav tsum tau muab tso rau.Thaum lub sij hawm soldering txheej txheem, cov hlau stencil npog cov txheej txheej solder, thiab solder paste yog precisely thov mus rau lub PCB pads los ntawm lub qhov ntawm lub stencil, kom ntseeg tau tseeb soldering nyob rau hauv lub tom ntej no tivthaiv txheej txheem los ua ke.
Yog li ntawd, txheej txheej solder paste yog ib qho tseem ceeb hauv kev tsim cov hlau stencil.Nyob rau theem pib ntawm kev tsim PCB, cov ntaub ntawv hais txog cov txheej txheem txheej txheej yog xa mus rau PCB cov chaw tsim khoom, uas tsim cov hlau stencil sib raug los xyuas kom meej qhov tseeb thiab kev ntseeg siab ntawm cov txheej txheem soldering.
Hauv PCB (Printed Circuit Board) tsim, "pastemask" (tseem hu ua "solder paste mask" lossis yooj yim "solder mask") yog txheej txheej tseem ceeb.Nws plays lub luag haujlwm tseem ceeb hauv cov txheej txheem soldering rau kev sib dhosCov khoom siv saum npoo av (SMDs).
Kev ua haujlwm ntawm cov hlau stencil yog txhawm rau tiv thaiv cov tshuaj txhuam los ntawm kev siv rau thaj chaw uas yuav tsum tsis txhob tshwm sim thaum soldering SMD Cheebtsam.Solder paste yog cov khoom siv los txuas cov khoom siv SMD rau PCB cov ntaub ntawv, thiab cov txheej txheej pastemask ua "barrier" los xyuas kom meej tias cov tshuaj nplaum siv tsuas yog siv rau thaj chaw tshwj xeeb.
Kev tsim cov txheej txheej pastemask yog qhov tseem ceeb hauv PCB cov txheej txheem tsim khoom vim nws ncaj qha cuam tshuam rau kev ua haujlwm zoo thiab tag nrho kev ua haujlwm ntawm SMD cov khoom.Thaum lub sij hawm tsim PCB, cov neeg tsim qauv yuav tsum ua tib zoo xav txog cov txheej txheem pastemask, kom ntseeg tau tias nws txoj kev sib raug zoo nrog lwm cov txheej txheem, xws li cov ntaub qhwv thiab cov txheej txheem txheej, los lav qhov tseeb thiab kev ntseeg siab ntawm cov txheej txheem soldering.
Tsim Specifications rau Solder Mask Txheej (Steel Stencil) hauv PCB:
Hauv PCB tsim thiab tsim khoom, cov txheej txheem tshwj xeeb rau Solder Mask Layer (tseem hu ua Steel Stencil) feem ntau txhais los ntawm cov qauv kev lag luam thiab cov chaw tsim khoom.Nov yog qee qhov qauv tsim tshwj xeeb rau Solder Mask Layer:
1. IPC-SM-840C: Qhov no yog tus qauv rau Solder Mask Layer tsim los ntawm IPC (Association Connecting Electronics Industries).Tus qauv qhia txog kev ua tau zoo, cov yam ntxwv ntawm lub cev, durability, thickness, thiab solderability yuav tsum tau rau lub qhov ncauj qhov ntswg.
2. Xim thiab Hom: Lub npog ntsej muag tuaj yeem tuaj ntau hom, xws liCua kub Solder Leveling (HASL) or Electroless Nickel Immersion Kub(ENIG), thiab ntau hom yuav muaj cov kev cai tshwj xeeb.
3. Kev Pabcuam ntawm Solder Mask Layer: Lub npog ntsej muag yuav tsum npog tag nrho cov cheeb tsam uas yuav tsum tau muaj cov khoom sib txuas, thaum ua kom muaj kev tiv thaiv zoo ntawm thaj chaw uas yuav tsum tsis txhob raug soldered.Lub ntsej muag lub ntsej muag yuav tsum tsis txhob npog qhov chaw mounting lossis silk-screen markings.
4. Clarity of Solder Mask Layer: Lub npog ntsej muag yuav tsum muaj qhov meej meej kom pom tseeb ntawm cov npoo ntawm cov ntaub qhwv thiab tiv thaiv cov nplaum nplaum los ntawm kev ntws mus rau hauv qhov chaw tsis xav tau.
5. Thickness ntawm Solder Mask Layer: Lub thickness ntawm lub npog ntsej muag yuav tsum ua raws li cov qauv kev cai, feem ntau yog nyob rau hauv ntau ntawm ntau kaum ntawm micrometers.
6. Pin Avoidance: Qee cov khoom tshwj xeeb lossis cov pins yuav tsum nyob twj ywm rau hauv lub ntsej muag lub ntsej muag kom tau raws li cov kev cai tshwj xeeb.Hauv cov xwm txheej zoo li no, cov lus qhia tshwj xeeb ntawm lub npog ntsej muag yuav tsum zam kom tsis txhob siv daim npog ntsej muag hauv cov chaw tshwj xeeb.
Ua raws li cov lus qhia tshwj xeeb no yog qhov tseem ceeb los xyuas kom meej qhov zoo thiab qhov tseeb ntawm cov txheej txheem ntawm lub npog ntsej muag, yog li txhim kho qhov kev vam meej thiab kev ntseeg siab ntawm PCB kev tsim khoom.Tsis tas li ntawd, kev ua raws li cov lus qhia tshwj xeeb no pab txhim kho kev ua tau zoo ntawm PCB thiab ua kom muaj kev sib dhos kom raug thiab soldering ntawm SMD Cheebtsam.Kev koom tes nrog cov chaw tsim khoom thiab ua raws li cov qauv tsim nyog thaum lub sijhawm tsim qauv yog ib kauj ruam tseem ceeb hauv kev ua kom zoo ntawm cov txheej steel stencil.
Post lub sij hawm: Aug-04-2023
