PCB (bọọdụ sekit biri ebi) nwere ike kewaa PCB siri ike na PCB na-agbanwe agbanwe, enwere ike kewaa nke mbụ n’ụdị atọ: PCB nwere ihu abụọ, PCB nwere ihu abụọ, na PCB nwere ọtụtụ. PCBS can be divided into three quality grades based on quality grade: Class 1, Class 2, and Class 3, with 3 of these having the highest requirements. Ọdịiche dị na ogo ogo PCB na -ebute ọdịiche dị mgbagwoju anya na ule na ụzọ nyocha. Ka ọ dị ugbu a, akaụntụ PCBS nwere ihu abụọ na akụkụ nwere ọtụtụ maka ngwa dị ukwuu na ngwa elektrọnik, na mgbe ụfọdụ a na-eji PCBS na-agbanwe agbanwe n’ọnọdụ ụfọdụ. Therefore, this paper will focus on the quality inspection of rigid double-sided and multi-layer PCBs. Mgbe emechara PCB, a ga -enyocha ya iji chọpụta ma ịdị mma ya na ihe achọrọ. It can be considered that quality inspection is an important guarantee of product quality and the smooth implementation of subsequent procedures.

Nnyocha nyocha

PCB inspection standards mainly include the following aspects:

A. Ụkpụrụ nke obodo ọ bụla setịpụrụ;

B. Ụkpụrụ agha maka obodo ọ bụla;

C. Ụkpụrụ ụlọ ọrụ dịka SJ/T10309;

D. PCB inspection instructions formulated by equipment supplier;

E. Nka na ụzụ chọrọ akara na eserese eserese PCB.

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. Na mkpịsị ụkwụ.

Ihe nyocha

N’agbanyeghị ụdị PCB, ha ga -enwerịrị ụzọ nyocha na ihe dị mma. Dabere na usoro nyocha, ihe nlele dị mma na -agụnyekarị nlele anya, nyocha arụmọrụ eletrọnịkị, nyocha arụmọrụ teknụzụ zuru oke, na nyocha metalization.

• nlele anya

Nnyocha anya dị mfe site n’enyemaka nke onye na -achị achị, vernier caliper, ma ọ bụ iko na -ebuli elu. Nnyocha ahụ gụnyere:

A. ọkpụrụkpụ nke efere, ịdị elu elu, na warpage.

B. Ọdịdị na mgbakọ akụkụ, ọkachasị akụkụ ọgbakọ dakọtara na njikọ eletriki na ụzọ ntuziaka.

C. Iguzosi ike n’ezi ihe na idoanya nke ụkpụrụ omume na ọnụnọ nke ijikọ mkpụmkpụ, mepere emepe, ma ọ bụ ihe efu.

D. Ogo elu, ọnụnọ olulu, ọkọ, ma ọ bụ pinholes na trace ma ọ bụ pad. Location of pad holes and other holes. Ekwesịrị ịlele oghere maka ntụpọ na -efu ma ọ bụ na -ezighi ezi, dayameta oghere na -emezu ihe achọrọ, yana nodules na oghere.

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

G. Mkpuchi mkpuchi. The coating flux is uniform and firm, the position is correct, the flux is uniform, and the color meets the requirements.

H. Ogo agwa, dịka ma ha kwụ chịm, dị ọcha, ma dị ọcha, na -enweghị ọkọ, mbanye, ma ọ bụ ezumike.

• Nnyocha arụmọrụ ọkụ eletrik n’ozuzu

Enwere ule abụọ n’okpuru ụdị nyocha a:

A. Connection performance test. N’ime ule a, a na-ejikarị multimeter elele njikọ nke ụkpụrụ na-eduzi site na itinye uche siri ike site na oghere PCBS nwere ihu abụọ yana njikọta nke PCBS nwere ọtụtụ. Maka ule a, PCBCart na -enye nlele izugbe na PCB ọ bụla arụpụtara tupu ọ hapụ ụlọ nkwakọba ihe ya iji hụ na emezuru ọrụ ya ndị bụ isi.

B. Emebere ule a iji lelee nguzogide mkpuchi nke otu ụgbọ elu ma ọ bụ n’etiti ụgbọ elu dị iche iche iji hụ na arụmọrụ mkpuchi nke PCB.

• Nnyocha teknụzụ izugbe

General technical inspection includes weldability and electroplating adhesion inspection. Maka nke mbụ, lelee ịdị nro nke onye na -ere ya na ụkpụrụ na -eduzi. For the latter, it can be checked by qualified tips that are first glued to the plating surface to be examined and then quickly pulled out after being pressed evenly. Na -esote, ekwesịrị ịhụ ụgbọ elu plating iji hụ na peeling pụtara. Na mgbakwunye, enwere ike họrọ ụfọdụ ndenye ego dabere na ọnọdụ ahụ n’ezie, dị ka ike mgbochi ọdịda ọdịda ọla kọpa na ike mgbochi ike.

• Ịmegharị ihe site na nyocha

Ogo oghere mepere emepe na-arụ ọrụ dị mkpa na PCB nwere ihu abụọ na PCB nwere ọtụtụ. Ọnụ ọgụgụ dị ukwuu nke ọdịda nke modulu eletriki na ọbụlagodi akụrụngwa niile bụ n’ihi ogo oghere mepere emepe. Therefore, it is necessary to pay more attention to the inspection of metalized holes. Nnyocha nyocha nke igwe na -agụnye akụkụ ndị a:

A. Ụgbọ elu igwe nke oghere oghere kwesịrị ịbụ nke zuru oke na nke ọma, na-enweghị oghere ma ọ bụ nodule.

B. A ga-enyocha akụrụngwa eletriki dịka okirikiri dị mkpirikpi na nke mepere emepe na nguzogide dị n’etiti oghere na ụzọ site na nzere nke ụgbọ elu plating. After environmental testing, the resistance change rate of the through-hole should not exceed 5% to 10%. Mechanical strength refers to the bonding strength between the metalized through-hole and pad. Nnwale nyocha nke metallographic bụ ọrụ maka ịlele ịdị mma nke elu plating, ọkpụrụkpụ na ịdị n’otu nke elu plating, yana ike njikọta n’etiti akwa plating na foil ọla.

A na -ejikọkarị nyocha nke igwe na nyocha anya na nyocha igwe. Nnyocha anya bụ ịhụ na etinye PCB n’okpuru ọkụ yana mgbidi zuru oke nke nwere oghere na-egosipụta ọkụ nhata. Agbanyeghị, ịgafe mgbidi nwere nodules ma ọ bụ oghere agaghị adị ka nke ọma. Maka imepụta oke, ekwesịrị ime nyocha site na ngwa nnwale dị n’ịntanetị dị ka onye na -enyocha agịga na -efe efe.

N’ihi usoro dị mgbagwoju anya nke PCB nwere ọtụtụ, ọ na-esiri ike ịchọta mmejọ ngwa ngwa ozugbo enwere nsogbu na ule mgbakọ modul sochirinụ. Yabụ, ịlele ịdị mma ya na ntụkwasị obi ya ga -akpacharịrị anya. Na mgbakwunye na ihe nlele oge niile dị n’elu, ihe nyocha ndị ọzọ gụnyere usoro ndị a: nguzogide onye ndu, nguzogide nke oghere mepere emepe, sekit dị n’ime, na sekit mepere emepe, mkpuchi mkpuchi n’etiti wires, ike njikọta ụgbọ elu electroplating, nrapado, iguzogide ujo ọkụ, nguzogide mmetụta, mmetụta igwe, ike ugbu a, wdg. A ga -enwerịrị ihe ngosi ọ bụla site na itinye akụrụngwa na ụzọ pụrụ iche.