Tsim cov cai rau MARK point thiab ntawm txoj hauj lwm ntawm PCB Circuit Board

Lub ntsiab lus MARK yog qhov qhia txog txoj haujlwm ntawm lub tshuab tsis siv neeg qhov chaw siv los ntawm PCB hauv kev tsim, thiab tseem hu ua qhov taw qhia siv. Txoj kab uas hla yog 1MM. Lub stencil mark point yog qhov qhia txog txoj hauj lwm thaum lub PCB luam tawm nrog solder paste / liab kua nplaum nyob rau hauv lub Circuit Court board tso txheej txheem. Kev xaiv ntawm Mark cov ntsiab lus ncaj qha cuam tshuam rau kev luam ntawv ntawm stencil thiab xyuas kom meej tias cov cuab yeej SMT tuaj yeem txheeb xyuas qhov tseeb. PCB pawg thawj coj saib cov khoom. Yog li, MARK taw tes yog qhov tseem ceeb heev rau SMT ntau lawm.

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① MARK taw tes: SMT cov khoom siv ntau lawm siv qhov taw tes no los nrhiav txoj haujlwm ntawm PCB pawg thawj coj saib, uas yuav tsum tau tsim thaum tsim lub rooj tsav xwm PCB. Txwv tsis pub, SMT yog qhov nyuaj rau tsim, lossis txawm tias tsis tuaj yeem tsim.

1. Nws raug nquahu kom tsim lub MARK taw tes ua lub voj voog lossis ib qho square parallel rau ntawm ntug ntawm lub rooj tsavxwm. Lub voj voog yog qhov zoo tshaj plaws. Txoj kab uas hla ntawm lub voj voog MARK taw tes feem ntau yog 1.0mm, 1.5mm, 2.0mm. Nws raug pom zoo tias qhov tsim txoj kab uas hla ntawm MARK point yog 1.0mm. Yog tias qhov loj me me dhau lawm, MARK dots tsim los ntawm PCB cov tuam txhab tsis tiaj tus, MARK dots tsis yooj yim lees paub los ntawm lub tshuab lossis kev lees paub qhov tseeb yog qhov tsis zoo, uas yuav cuam tshuam rau qhov tseeb ntawm kev luam ntawv thiab kev tso kawm. Yog tias nws loj dhau, nws yuav dhau lub qhov rais loj uas tau lees paub los ntawm lub tshuab, tshwj xeeb tshaj yog lub tshuab luam ntawv DEK screen) ;

2. Txoj hauj lwm ntawm MARK taw tes feem ntau yog tsim los ntawm lub kaum sab xis ntawm lub rooj tsav xwm PCB. Lub MARK taw tes yuav tsum yog tsawg kawg yog 5 hli ntawm ntug ntawm lub rooj tsavxwm, txwv tsis pub lub MARK taw tes yuav yooj yim clamped los ntawm lub tshuab clamping ntaus ntawv, ua rau lub tshuab lub koob yees duab tsis mus ntes MARK point;

3. Sim tsis txhob tsim txoj hauj lwm ntawm MARK taw tes kom symmetrical. Lub hom phiaj tseem ceeb yog txhawm rau tiv thaiv tus neeg teb xov tooj qhov tsis saib xyuas hauv cov txheej txheem tsim khoom los ntawm kev ua rau PCB rov qab, ua rau qhov tsis raug ntawm kev tso ntawm lub tshuab thiab poob ntawm kev tsim khoom;

4. Tsis txhob muaj cov ntsiab lus xeem zoo sib xws lossis cov ntaub qhwv hauv qhov chaw tsawg kawg 5 hli nyob ib ncig ntawm MARK point, txwv tsis pub lub tshuab yuav misidentify MARK point, uas yuav ua rau poob rau ntau lawm;

② Txoj hauj lwm ntawm kev tsim: Kev tsim tsis tsim nyog yuav ua rau tsawg dua tin lossis txawm tias khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob Nws raug nquahu kom cov neeg tsim qauv tsis txhob tsim ntawm cov ntaub qhwv thaum tsim vias. Thaum lub qhov ntawm lub qhov yog tsim nyob ib ncig ntawm lub ncoo, nws raug nquahu kom lub ntug ntawm lub qhov ntawm lub qhov thiab lub ncoo ntug nyob ib ncig ntawm lub zoo tib yam resistor, capacitor, inductance, thiab sib nqus hlaws pad yuav tsum tau khaws cia tsawg kawg yog 0.15 hli los yog ntau tshaj. Lwm cov ICs, SOTs, inductors loj, electrolytic capacitors, thiab lwm yam. Cov npoo ntawm cov vias thiab cov ntaub qhwv ib ncig ntawm cov ntaub qhwv ntawm diodes, cov khoom sib txuas, thiab lwm yam yog khaws cia tsawg kawg yog 0.5 hli lossis ntau dua (vim qhov loj ntawm cov khoom no yuav nthuav dav thaum lub stencil yog tsim) los tiv thaiv cov tshuaj txhuam los ntawm kev poob ntawm lub vias thaum cov khoom rov qab;

③ Thaum tsim lub voj voog, xyuam xim rau qhov dav ntawm lub voj voog txuas lub ncoo kom tsis txhob siab tshaj qhov dav ntawm lub ncoo, txwv tsis pub, qee qhov zoo-pitch Cheebtsam yog ib qho yooj yim rau kev sib txuas los yog soldered thiab tsawg tinned. Thaum cov pins uas nyob ib sab ntawm IC cov khoom siv rau hauv av, nws raug nquahu kom cov neeg tsim khoom tsis tsim lawv ntawm lub ncoo loj, yog li kev tsim ntawm SMT soldering tsis yooj yim rau kev tswj;

Vim muaj ntau yam ntawm cov khoom, tsuas yog cov ntaub qhwv qhov ntau thiab tsawg ntawm cov khoom siv feem ntau thiab qee cov khoom tsis yog raws li kev cai tam sim no. Hauv kev ua haujlwm yav tom ntej, peb yuav txuas ntxiv ua qhov haujlwm no, tsim kev pabcuam thiab tsim khoom, kom ua tiav txhua tus neeg txaus siab. .