A preface.

Tsis muaj tooj liab hauv lub qhov yog qhov teeb meem ua haujlwm ntawm PCB. Nrog kev txhim kho kev tshawb fawb thiab thev naus laus zis, PCB qhov tseeb (piv piv) xav tau kom siab dua thiab siab dua, uas tsis tsuas yog coj teeb meem rau PCB cov tuam txhab tsim khoom (qhov tsis sib xws ntawm tus nqi thiab qhov ua tau zoo), tab sis kuj tseem ua rau muaj teeb meem loj zais zais rau cov neeg siv khoom qis! Ua qhov kev txheeb xyuas yooj yim ntawm cov ntsiab lus hauv qab no, vam tias yuav muaj kev nkag siab thiab pab rau cov npoj yaig muaj feem cuam tshuam!

2. Kev txheeb xyuas daim duab kab ntses

Simple analysis of PCB hole copper and improvement methods

Classification and characteristics of copper – free holes

1. Tsis muaj tooj liab hauv PTH qhov: txheej hluav taws xob ntawm cov phaj tooj liab saum npoo yog qhov sib xws thiab ib txwm muaj. Cov hluav taws xob txheej ntawm cov phaj hauv lub qhov yog faib sib npaug los ntawm qhov chaw mus rau qhov tawg, thiab qhov tawg tau npog los ntawm txheej hluav taws xob tom qab kos duab.

Simple analysis of PCB hole copper and improvement methods

2. Phaj hluav taws xob tooj liab nyias qhov tsis muaj tooj liab:

(1) Tag nrho cov phaj tooj liab nyias lub qhov tsis muaj tooj liab – saum npoo tooj liab thiab qhov tooj liab phaj phaj hluav taws xob txheej yog nyias heev, tom qab cov duab hluav taws xob ua ntej kho ntawm micro etching qhov nyob hauv nruab nrab ntawm feem ntau ntawm cov phaj tooj liab yog corroded, tom qab cov duab hluav taws xob txheej yog encased;

(2) tsis muaj tooj liab nyob rau hauv qhov nyias nyias ntawm cov phaj tooj liab hauv lub qhov – txheej hluav taws xob ntawm cov phaj tooj liab tau zoo ib yam thiab ib txwm muaj, thiab cov hluav taws xob txheej ntawm phaj hauv lub qhov yog txo los ntawm lub qhov mus rau qhov tawg, thiab qhov tawg feem ntau yog nyob nruab nrab ntawm lub qhov, thiab txheej tooj liab tau tso ntawm qhov tawg

Sab xis muaj homogeneity zoo thiab sib npaug, thiab cov duab tom qab tawg tau npog los ntawm txheej txheej.

Simple analysis of PCB hole copper and improvement methods

3. Kho qhov puas:

(1) tooj liab kho qhov tsis zoo – lub rooj tooj tooj liab phaj hluav taws xob txheej tau zoo ib yam thiab ib txwm muaj, lub qhov tooj liab phaj hluav taws xob txheej tsis muaj qhov sib txig sib luag, qhov tawg tsis xwm yeem, tuaj yeem tshwm hauv lub qhov ncauj kuj tseem tuaj yeem pom nyob hauv nruab nrab ntawm lub qhov , nyob rau hauv lub qhov phab ntsa feem ntau tshwm ntxhib convex thiab lwm yam tsis zoo, daim duab hluav taws xob tom qab qhov tawg tau npog los ntawm daim duab hluav taws xob txheej.

(2) kev txhim kho corrosion ntawm lub qhov, lub rooj tooj tooj liab phaj hluav taws xob txheej yog qhov sib xws thiab ib txwm muaj, lub qhov tooj liab phaj hluav taws xob txheej tsis muaj qhov sib hloov, qhov tawg tsis xwm yeem, tuaj yeem tshwm hauv qhov orifice kuj tseem tuaj yeem pom nyob hauv nruab nrab ntawm lub qhov , nyob rau hauv lub qhov phab ntsa feem ntau tshwm sim ntxhib convex thiab lwm yam tsis zoo, qhov tawg daim duab hluav taws xob txheej tsis qhwv cov phaj hluav taws xob txheej.

Simple analysis of PCB hole copper and improvement methods

4. Tsis muaj tooj liab ntsaws qhov: tom qab kos duab kos, muaj cov khoom pom tseeb nyob hauv qhov, feem ntau ntawm lub qhov phab ntsa tau tawg, cov duab hluav taws xob txheej ntawm qhov tawg tsis tau npog los ntawm cov phaj hluav taws xob txheej.

Simple analysis of PCB hole copper and improvement methods

5. Daim duab hluav taws xob qhov tsis muaj tooj liab: txheej hluav taws xob ntawm qhov tawg tsis tau qhwv hauv cov phaj hluav taws xob txheej – daim duab hluav taws xob txheej thiab phaj txheej txheej tuab tuab yog ib yam, qhov tawg tau tawg; Cov duab hluav taws xob txheej qhia pom qhov hloov pauv kom txog thaum nws ploj mus, thiab cov phaj hluav taws xob txheej txuas ntxiv mus rau qhov deb tshaj li cov duab hluav taws xob txheej thiab tom qab ntawd txiav tawm.

Simple analysis of PCB hole copper and improvement methods

Simple analysis of PCB hole copper and improvement methods

Iv. Kev Qhia Txhim Kho:

1. Kev ua haujlwm (cov laug sab saud thiab qis dua, teeb tsa qhov ntsuas, kev saib xyuas, kev coj txawv txawv);

2. Cov khoom siv (crane, pub mis, cua sov cwj mem, kev co, cua twj tso kua mis, pom lub voj voog);

3. Cov khoom siv (phaj, tshuaj pleev);

4. Cov txheej txheem (tsis, txheej txheem, txheej txheem thiab kev tswj kom zoo);

5. Ib puag ncig (kev hloov pauv tshwm sim los ntawm qias neeg, tsis meej pem thiab lwm yam).

6. Ntsuas (ntsuas tshuaj kua, tshuaj xyuas tooj liab).