PCB (covluam tawm hauv Circuit Court board) can be divided into rigid PCB and flexible PCB, the former can be divided into three types: single-sided PCB, double-sided PCB, and multi-layer PCB. PCBS tuaj yeem faib ua peb qib zoo raws qib kawm tau zoo: Chav Kawm 1, Chav Kawm 2, thiab Chav Kawm 3, nrog 3 ntawm cov no muaj qhov xav tau tshaj plaws. Differences in PCB quality levels lead to differences in complexity and testing and inspection methods. Txog tam sim no, nruj ob tog thiab ntau txheej PCBS tus lej rau tus lej loj ntawm cov ntawv thov hauv cov khoom siv hluav taws xob, thiab qee zaum PCBS hloov pauv tau siv qee qhov xwm txheej. Therefore, this paper will focus on the quality inspection of rigid double-sided and multi-layer PCBs. Tom qab PCB tsim tawm, nws yuav tsum tau tshuaj xyuas los txiav txim siab seb qhov khoom zoo sib xws nrog cov qauv tsim. Nws tuaj yeem txiav txim siab tias kev tshuaj xyuas zoo yog qhov lav zoo ntawm cov khoom lag luam thiab kev ua tiav ntawm cov txheej txheem tom ntej.

Soj ntsuam cov qauv

Cov txheej txheem tshuaj xyuas PCB feem ntau suav nrog cov hauv qab no:

A. Cov qauv teev tseg los ntawm txhua lub tebchaws;

B. Cov qauv tub rog rau txhua lub tebchaws;

C. Cov txheej txheem muaj xws li SJ/T10309;

D. PCB inspection instructions formulated by equipment supplier;

E. Technical requirements marked on PCB design drawings.

For PCBS that have been identified as keyboards in equipment, these key characteristic parameters and indicators must be centralized and checked from the head, in addition to regular inspection. To the toes.

Cov khoom tshuaj xyuas

Tsis hais hom PCB, lawv yuav tsum tau ua cov txheej txheem tshuaj xyuas zoo ib yam thiab cov khoom. According to the inspection method, quality inspection items usually include visual inspection, general electrical performance inspection, general technical performance inspection, and metalization inspection.

• Visual inspection

Kev tshuaj xyuas qhov muag yog yooj yim nrog kev pab los ntawm tus kav, vernier caliper, lossis iav tsom iav. The inspection includes:

A. plate thickness, surface roughness, and warpage.

B. Qhov pom thiab qhov sib dhos qhov ntev, tshwj xeeb tshaj yog qhov sib dhos qhov ntev sib xws nrog cov txuas hluav taws xob thiab cov lus qhia.

C. Kev ntseeg siab thiab meej ntawm cov qauv coj ua thiab muaj qhov txuas luv, qhib burr, lossis tsis muaj dab tsi.

D. Qhov zoo ntawm qhov chaw, muaj cov qhov, khawb, lossis pinholes ntawm cov ntawv luam tawm los yog ncoo. Qhov chaw ntawm qhov ncoo thiab lwm qhov. Qhov yuav tsum tau tshuaj xyuas qhov ploj lossis xuas nrig tsis raug, lub qhov taub ua tau raws li qhov yuav tsum tau ua, thiab cov nodules thiab voids.

F. Pad quality and firmness, roughness, brightness, and clearance of raised defects.

G. Txheej zoo. Cov txheej txheej txheej yog qhov sib xws thiab ruaj khov, txoj haujlwm yog qhov tseeb, cov dej ntws tsis sib xws, thiab cov xim ua tau raws li qhov xav tau.

H. Cov yam ntxwv zoo, xws li seb lawv puas ruaj khov, huv, thiab huv, tsis muaj khawb, nkag mus, lossis tawg.

• Kev tshuaj xyuas hluav taws xob dav

Muaj ob qhov kev xeem raws li qhov kev xeem no:

A. Kev sib txuas ua haujlwm tau zoo. Hauv qhov kev ntsuas no, lub ntsuas qhov ntsuas feem ntau yog siv los tshuaj xyuas kev sib txuas ntawm cov qauv coj ua los ntawm kev tsom mus rau cov hlau los ntawm qhov ntawm ob sab PCBS thiab kev sib txuas ntawm ntau txheej PCBS. Txog qhov kev sim no, PCBCart muab kev txheeb xyuas dav dav ntawm txhua tus PCB tsim ua ntej nws tawm nws lub tsev rau khoom kom ntseeg tau tias nws cov haujlwm yooj yim tau ua tiav.

B. Qhov kev ntsuas no yog tsim los tshuaj xyuas qhov rwb thaiv tsev tiv thaiv ntawm tib lub dav hlau lossis ntawm cov dav hlau sib txawv kom ntseeg tau tias kev ua haujlwm rwb thaiv tsev ntawm PCB.

• Kev tshuaj xyuas dav dav

Kev tshuaj xyuas dav dav suav nrog weldability thiab tshuaj electroplating adhesion. Rau yav dhau los, txheeb xyuas qhov ntub dej ntawm cov laug rau tus qauv coj ua. Txog qhov kawg, nws tuaj yeem tshuaj xyuas los ntawm cov lus qhia tsim nyog uas tau ua thawj glued rau plating nto kom raug tshuaj xyuas thiab tom qab ntawd rub tawm sai tom qab raug nias tusyees. Tom ntej no, lub dav hlau plating yuav tsum tau soj ntsuam kom ntseeg tau tias muaj tev tshwm sim. Ib qho ntxiv, qee qhov kev txheeb xyuas tuaj yeem raug xaiv raws li qhov xwm txheej tiag tiag, xws li cov ntawv ci tooj liab tiv thaiv lub zog poob thiab hlau tiv thaiv lub zog.

• Metallization through inspection

Qhov zoo ntawm cov hlau ua lub luag haujlwm tseem ceeb hauv PCB ob tog thiab ntau txheej PCB. Ib qho loj ntawm kev ua tsis tiav ntawm cov qauv hluav taws xob thiab txawm tias tag nrho cov cuab yeej siv yog vim qhov zoo ntawm cov hlau qhov. Yog li ntawd, nws yog qhov yuav tsum tau them nyiaj ntau dua rau kev tshuaj xyuas ntawm cov hlau qhov. Kev tshuaj xyuas cov hlau suav nrog cov hauv qab no:

A. Cov dav hlau hlau ntawm phab ntsa hla lub qhov yuav tsum ua kom tiav thiab du, tsis muaj qhov khoob los yog nodule.

B. Cov khoom siv hluav taws xob yuav tsum tau tshuaj xyuas raws li qhov luv thiab qhib Circuit Court ntawm lub ncoo thiab kev tiv thaiv nruab nrab ntawm qhov hla thiab cov hlau lead los ntawm kev siv hlau ntawm lub plating dav hlau. Tom qab kuaj ib puag ncig, qhov kev hloov pauv ntawm qhov dhau los ntawm qhov yuav tsum tsis pub dhau 5% txog 10%. Lub zog siv tshuab yog hais txog kev sib zog ua kom muaj zog ntawm cov hlau hla los ntawm qhov thiab ncoo. Kev tshuaj ntsuam xyuas hlau yog lub luag haujlwm los tshuaj xyuas qhov zoo ntawm txheej plating, tuab thiab tsis sib xws ntawm cov plating nto, thiab lub zog sib txuas ntawm cov plating nto thiab cov ntawv ci tooj liab.

Kev tshuaj xyuas hlau yog feem ntau ua ke nrog kev tshuaj xyuas pom thiab kev tshuaj xyuas txhua yam. Visual inspection is to observe that the PCB is placed under light and that the complete smooth through-hole wall reflects light evenly. Txawm li cas los xij, hla cov phab ntsa uas muaj cov nodules lossis voids yuav tsis ci li. Txog kev tsim khoom ntau, kev tshuaj xyuas yuav tsum tau ua los ntawm cov cuab yeej ntsuas online xws li lub tshuab ntsuas rab ya.

Vim yog cov txheej txheem nyuaj ntawm ntau txheej PCB, nws nyuaj rau nrhiav qhov ua txhaum sai sai thaum muaj teeb meem tshwm sim nyob rau hauv ntu ntu ntu kev sib dhos tom ntej. Yog li ntawd, txheeb xyuas nws qhov zoo thiab ntseeg tau yuav tsum nruj heev. Ntxiv nrog rau cov khoom tshuaj xyuas niaj hnub no, lwm yam khoom tshuaj xyuas suav nrog cov hauv qab no: tus neeg xyuas pib tsis kam, hlau hla dhau qhov tsis kam, sab hauv luv Circuit Court, thiab qhib Circuit Court, tiv thaiv kev tiv thaiv ntawm cov xov hlau, electroplating dav hlau sib txuas lub zog, nplaum, ua kom sov tsis kam, cuam ​​tshuam tsis kam, cuam tshuam cov khoom siv, lub zog tam sim no, thiab lwm yam. Txhua qhov ntsuas yuav tsum tau txais los ntawm kev thov cov cuab yeej tshwj xeeb thiab cov txheej txheem.