Hauv kev tsim hluav taws xob, tshwj xeeb tshaj yog nyob rau hauv cov txheej txheem ntws ntawm nto mount technology (SMT),pcb steel mesh, raws li qhov tshwj xeeb SMT pwm, ncaj qha cuam tshuam rau vuam zoo thiab kev ua haujlwm ntawm cov khoom siv hluav taws xob raws li nws cov khoom zoo. Kev nkag siab tob ntawm pcb steel mesh ntau lawm yog qhov tseem ceeb rau kev txhim kho qib ntawm kev tsim hluav taws xob.
1, Txhais thiab Kev Ua Haujlwm ntawm pcb Steel Mesh
pcb steel mesh, tseem hu ua SMT template, feem ntau yog ua los ntawm stainless hlau khoom. Nws lub luag haujlwm tseem ceeb yog txhawm rau pab txhawm rau txhawm rau txhawm rau txhawm rau muab tshuaj txhuam, kom ntseeg tau tias qhov tsim nyog ntawm cov tshuaj muab tshuaj yog raug xa mus rau txoj haujlwm raug xaiv ntawm lub rooj tsavxwm khoob pcb. Nyob rau ntawm SMT cov kab ntau lawm, cov tshuaj pleev xim pleev xim yog sib npaug ntawm cov ntaub nplaum ntawm lub pcb los ntawm cov qhov mesh ntawm cov hlau mesh, nteg lub hauv paus rau cov khoom txuas ntxiv txuas ntxiv thiab soldering, thiab yog qhov txuas tseem ceeb hauv kev ua kom ntseeg tau thiab ruaj khov ntawm cov khoom siv hluav taws xob sib txuas.
2, Kev tsim cov txheej txheem ntawm pcb steel mesh
(1) Tshuaj etching txoj kev
Cov txheej txheem ntws: Ua ntej, tsim thiab teeb tsa cov ntawv hlau siv cov software tshaj lij los tsim cov ntaub ntawv raug. Tom qab ntawd, cov khoom siv photosensitive yog uniformly coated rau saum npoo ntawm cov ntawv hlau. Siv LDI laser direct imaging technology, tus qauv nyob rau hauv cov ntaub ntawv cov ntaub ntawv yog ncaj qha mus rau lub steel ntawv coated nrog photosensitive cov ntaub ntawv nyob rau hauv daim ntawv ntawm ib tug laser beam, ua kom tiav cov kev raug mob. Tom ntej no, kev txhim kho yog nqa tawm kom tshem tawm cov khoom siv tsis pom kev photosensitive thiab nthuav tawm cov cheeb tsam uas yuav tsum tau etched. Rov qab siv cov tshuaj etching rau etch cov ntawv hlau los tsim cov duab mesh uas xav tau, thiab thaum kawg ua tiav cov hlau mesh ntau lawm los ntawm cov ntawv hlau tu thiab mesh ncab cov kauj ruam.
Nta: Cov qauv no tuaj yeem molded hauv ib qho mus, nrog kev tsim khoom ceev ceev thiab tus nqi qis. Txawm li cas los xij, nws muaj qhov tsis xws luag, thiab thaum lub sij hawm etching, nws yog ib qho yooj yim uas yuav ua rau lub mesh kom muaj ib tug hourglass zoo los yog qhib qhov luaj li cas los ua loj (ntau etching) vim yog qhov nyuaj rau kev tswj cov etching degree. Ntxiv mus, cov txheej txheem ntau lawm yog cuam tshuam los ntawm lub hom phiaj tseem ceeb xws li kev paub ntawm cov neeg ua haujlwm thiab cov tshuaj zoo, uas ua rau muaj kev cuam tshuam loj heev, ua rau nws tsis tsim nyog rau kev tsim cov hlau mesh zoo. Tsis tas li ntawd, cov tshuaj siv tshuaj etching tuaj yeem ua rau muaj kuab paug rau ib puag ncig, uas tsis yog raws li kev tiv thaiv ib puag ncig tam sim no.
(2) Laser txiav txoj kev
Cov txheej txheem ntws: Tsim cov ntaub ntawv raug tseeb los ntawm kev tsim software, siv siab - laser beams los txiav cov ntawv hlau raws li cov ntaub ntawv cov ntaub ntawv, thiab txiav cov qhov mesh kom raug raws li tus qauv tsim. Tom qab txiav, cov ntawv hlau yog polished kom tshem tawm burrs thiab slag generated thaum lub sij hawm txiav, thiab thaum kawg lub mesh stretching txheej txheem yog nqa tawm.
Yam ntxwv: Laser txiav txoj kev muaj qhov zoo ntawm cov ntaub ntawv ntau lawm raug thiab tsis tshua muaj kev cuam tshuam los ntawm lub hom phiaj tseem ceeb. Lub trapezoidal qhib txiav los ntawm nws muaj txiaj ntsig zoo rau kev siv tshuaj tua kab demolding, ua kom muaj kev txiav thiab ua tau raws siab - qhov yuav tsum tau ua rau cov hlau mesh ntau lawm. Txawm li cas los xij, txoj kev no suav nrog kev txiav cov mesh qhov ib los ntawm ib qho, uas yog qeeb los tsim thiab kuj kim. Txawm li cas los xij, vim nws qhov kev ua tau zoo tshaj plaws, nws yog tam sim no siv dav hauv SMT steel mesh kev lag luam.
(3) Electroforming txoj kev
Cov txheej txheem ntws: Siv cov yeeb yaj kiab photosensitive sib npaug ntawm cov substrate, siv LDI laser direct imaging technology rau raug, tsim ib qho qauv ntawm cov duab rhiab heev, thiab tom qab ntawd kho cov qauv los ntawm kev txhim kho. Tom ntej no, cov txheej txheem nickel electroplating yog nqa tawm kom tso nyiaj npib tsib xee hlau hauv ib cheeb tsam tshwj xeeb, maj mam tsim cov hlau mesh uas xav tau. Tom qab sib sau, ntxuav cov ntawv hlau kom tshem tawm cov impurities, thiab thaum kawg ua haujlwm mesh stretching.
Nta: Cov phab ntsa hlau mesh tsim los ntawm txoj kev electroplating yog du, tshwj xeeb tshaj yog tsim rau kev tsim cov ultra-fine spacing steel mesh, uas tuaj yeem ua tau raws li cov kev xav tau ntawm cov khoom siv sib txuas ntawm cov khoom siv hluav taws xob hauv kev tsim cov khoom siv hluav taws xob ntawm cov khoom siv me me thiab kev sib koom ua ke. Txawm li cas los xij, nws cov txheej txheem tsim khoom yog qhov nyuaj, suav nrog kev siv tshuaj tua kab mob, ua rau ib puag ncig, thiab muaj lub voj voog ntau lawm thiab tus nqi siab, uas txwv nws qhov loj - daim ntawv thov.
3, Cov ntaub ntawv xav tau los ua pcb steel mesh
(1) pcb
Lub pcb muab yuav tsum muaj qhov tseeb version thiab tsis muaj teeb meem xws li deformation, puas, los yog tawg. Nws yog ib qho tseem ceeb siv rau steel mesh ntau lawm, kom ntseeg tau tias cov txheej txheem ntawm cov hlau mesh qhov sib phim rau txoj hauj lwm ntawm pcb solder pads kom raug.
(2) Cov ntaub ntawv
Hom ntawv yuav tsum muaj: Cov pab pawg ua haujlwm feem ntau lees txais ntau hom CAD cov ntaub ntawv, xws li GERBER, HPGL, . JOB,. pcb ib,. GWK,. CWJ,. PWK,. Dxf,. PDF, thiab lwm yam Meanwhile, zoo ib yam li PAD2000, POWERpcb, GCCAM4.14, PROTEL, AUTOCADR14(2000), CLIENT98, CAW350W, V2001 Cov software tsim cov ntaub ntawv kuj sib xws. Thaum cov ntaub ntawv cov ntaub ntawv loj heev, nws yuav tsum tau siv ZIP, . ARJ,. LZH thiab lwm hom compression yog compressed thiab xa mus.
Cov ntsiab lus yuav tsum muaj: Cov ntaub ntawv cov ntaub ntawv yuav tsum suav nrog SMT solder paste txheej, uas yuav tsum suav nrog Fiducial Mark cov ntaub ntawv thiab cov ntaub ntawv pcb cov ntaub ntawv, nrog rau cov ntaub ntawv txheej txheem kom paub meej cov ntaub ntawv tseem ceeb xws li pem hauv ntej thiab nraub qaum ntawm cov ntaub ntawv, pawg pawg, thiab lwm yam, muab cov ntaub ntawv nthuav dav thiab raug txhawb rau steel mesh ntau lawm.
(3) Kev piav qhia ntxaws ntawm GERBER cov ntaub ntawv
Cov ntaub ntawv GERBER tau thov los ntawm Asmeskas tuam txhab GERBER, uas hloov cov ntaub ntawv pcb rau hauv cov ntaub ntawv hluav taws xob uas tuaj yeem lees paub los ntawm ntau yam kev kos duab kho qhov muag, tseem hu ua optical drawing files. Nws yog cov qauv software nrog X, Y kev tswj hwm thiab cov lus txib ntxiv, lub npe hu ua "RS274 format", uas tau dhau los ua cov qauv ntaub ntawv hauv kev lag luam pcb. Cov ntaub ntawv GERBER yuav tsum tau siv ua ke nrog cov ntawv teev npe Aperture, uas ua ke txhais qhov pib, cov duab, thiab qhov loj ntawm daim duab. D-Code qhia qhov loj thiab cov duab ntawm cov duab xws li kab, qhov, thiab cov ntaub qhwv hauv lub voj voog. GERBER cov ntaub ntawv tau muab faib ua ob hom: RS274D thiab RS274X. RS274D muaj X thiab YDATA, tab sis tsis suav nrog D-Code cov ntaub ntawv; RS274X muaj cov ntsiab lus ntawm X, YDATA, thiab D-Code ntaub ntawv ib txhij.
4, Qhib tsim ntawm steel mesh
Kev tsim ntawm steel mesh qhib ncaj qha cuam tshuam rau cov nyhuv demolding ntawm solder paste, feem ntau txiav txim siab los ntawm peb yam: qhov dav rau thickness ratio / cheeb tsam ntawm qhov qhib, geometric duab ntawm lub qhov qhib sidewall, thiab smoothness ntawm lub qhov phab ntsa. Qhov thib ob yam tseem ceeb yog txiav txim siab los ntawm steel mesh manufacturing technology, thaum lub dav rau thickness ratio thiab cheeb tsam ntawm qhov qhib yog qhov tseem ceeb ntawm cov txheej txheem tsim.
(1) Dav rau thickness ratio thiab cheeb tsam piv
Txhais: Dav rau thickness piv yog hais txog qhov sib piv ntawm qhov qhib dav rau lub thickness ntawm cov hlau mesh; Thaj tsam piv yog hais txog qhov piv ntawm thaj chaw qhib rau tus ntoo khaub lig- ntu ntu ntawm phab ntsa qhov. Feem ntau hais lus, kom ua tiav cov txiaj ntsig zoo, qhov dav rau qhov sib piv yuav tsum siab dua 1.5 thiab thaj tsam piv yuav tsum ntau dua 0.66. Thaum qhov qhib qhov ntev tsis ncav cuag 5 npaug ntawm qhov dav, qhov sib piv ntawm thaj tsam yog siv los kwv yees qhov teeb meem ntawm solder paste demolding qhov teeb meem, thaum lwm qhov, qhov dav rau thickness yog xam.
Piv txwv ntawm cov khoom qhib: Siv cov khoom sib xyaw ua piv txwv, xws li QFP cov khoom, thaum PITCH yog 0.635mm, lub ncoo dav yog 0.35mm, qhov qhib dav feem ntau yog tsim los ntawm 0.30-0.31mm, thiab template thickness yog 0.15-0.18mm. Lub sijhawm no, qhov dav rau qhov sib piv yog nyob nruab nrab ntawm 1.7-2.1, thiab thaj tsam piv ntawm 0.69-0.85; Rau BGA Cheebtsam, yog lub ncoo txoj kab uas hla yog Φ 1.27mm, qhov qhib txoj kab uas hla yog feem ntau Φ 0.75mm, template thickness yog 0.15-0.18mm, thiab cheeb tsam piv ntawm 1.0-1.25. Cov khoom sib txawv muaj cov qauv tsim qauv sib txawv raws li lawv qhov loj me, qhov sib txawv, thiab lwm yam ntxwv.
(2) Kev txiav txim siab tsim tshwj xeeb
Rau nti zoo li cov khoom saum toj no 0603 (1608), tus tsim yuav tsum tsom rau qhov teeb meem ntawm kev tiv thaiv cov hlaws hlaws. Fine pitch IC / QFP Cheebtsam, txhawm rau tiv thaiv kev ntxhov siab, nws yog qhov zoo tshaj kom muaj qhov sib npaug ntawm ob qhov kawg ntawm qhov qhib; Tib yam siv rau BGA thiab 0402, 0201 Cheebtsam nrog square qhov. Lub nti zoo li cov khoom siv tau txais txoj kev qhib qhov qhib kom tiv thaiv qhov tshwm sim ntawm cov khoom tombstones. Nyob rau tib lub sijhawm, qhov qhib dav ntawm cov hlau mesh tsim yuav tsum xyuas kom meej tias tsawg kawg 4 qhov siab tshaj plaws tin pob tuaj yeem hla tau zoo.
(3) Adhesive txheej txheem steel mesh qhib tsim
Kev paub hauv kev tsim cov hlau mesh qhib siv cov cuab yeej nplaum yog qhov tseem ceeb. Qhov qhib ntawm cov nplaum hlau mesh feem ntau yog tsim los ua ib txoj hlua ntev los yog lub voj voos. Yog tias tsis yog MARK point positioning yog siv, ob qhov chaw yuav tsum tau qhib. Qhov dav W ntawm qhov qhib elongated feem ntau ntawm 0.3mm thiab 2.0mm; Qhov txoj kab uas hla ntawm lub voj voog qhov sib txawv nyob ntawm qhov kev tivthaiv, piv txwv li, 0603 tivthaiv sib haum mus rau lub voj voog txoj kab uas hla ntawm 0.36mm, thiab 0805 tivthaiv sib haum rau 0.55mm. Lub thickness ntawm cov nplaum hlau mesh feem ntau xaiv li 0.15mm-0.2mm.
5, Tom qab kho cov hlau mesh
Etching thiab electroplating steel mesh feem ntau tsis tas yuav xa- ua, uas yog tsom rau laser hlau mesh. Vim yog tsim cov hlau slag adhering rau lub qhov phab ntsa thiab qhib thaum lub sij hawm laser txiav, nto polishing kev kho mob feem ntau yuav tsum tau. Kev sib tsoo tuaj yeem tsis tsuas yog tshem tawm slag, tab sis kuj roughen saum npoo ntawm cov ntawv hlau, ua kom muaj kev sib txhuam ntawm qhov chaw, ua kom yooj yim rau dov ntawm solder paste, thiab txhim kho cov nyhuv soldering. Yog tias tsim nyog, "hluav taws xob polishing" kuj tuaj yeem raug xaiv los tshem tawm slag ntxiv thiab txhim kho qhov zoo ntawm lub qhov phab ntsa.
6, Ntxuav thiab tu cov hlau mesh
Thaum siv steel mesh, solder paste los yog nplaum yuav nyob twj ywm ntawm lub mesh thiab nto. Yog tias tsis tau ntxuav hauv lub sijhawm, nws yuav cuam tshuam rau kev luam ntawv tom ntej thiab tseem thaiv cov mesh. Cov kev tu ib txwm muaj xws li so thiab ultrasonic tu. Kev so feem ntau yog siv ib daim ntaub dawb lint uas tau muab tso rau hauv tus neeg saib xyuas kom tshem tawm cov khoom siv los yog cov nplaum nplaum. Ultrasonic tu yog muab faib ua hom immersion thiab tshuaj tsuag hom, thiab lwm yam manufacturers siv semi- tsis siv neeg ultrasonic tu tshuab. Tsis tas li ntawd, hauv kev siv txhua hnub, kev saib xyuas yuav tsum tau them nyiaj kom tsis txhob muaj kev ntxhov siab ntau dhau ntawm cov hlau mesh thiab ua kom cov qib ntawm cov hlau mesh thiab pcb thaum luam ntawv kom tswj tau qhov zoo ntawm cov hlau mesh thiab txuas ntxiv nws lub neej kev pab cuam.