Hauv kev tsim thiab ua cov tsheb PCBA, qee lub rooj tsav xwm yuav tsum tau coated nrog tooj liab. Copper txheej tuaj yeem txo qhov cuam tshuam ntawm SMT thaj ua cov khoom lag luam ntawm kev txhim kho kev tiv thaiv kev cuam tshuam thiab txo qhov chaw voj voog. Nws cov txiaj ntsig zoo tuaj yeem siv tag nrho hauv SMT thaj ua haujlwm. Txawm li cas los xij, muaj ntau yam uas yuav tsum tau them sai sai rau thaum lub sij hawm tooj liab pouring txheej txheem. Cia kuv qhia koj txog cov ntsiab lus ntawm PCBA ua cov txheej txheem tooj liab pouring.
Ib. Copper pouring txheej txheem
1. Pretreatment ib feem: Ua ntej tus txheej txheem tooj liab pouring, PCB lub rooj tsavxwm yuav tsum tau pretreated, nrog rau kev tu, xeb tshem tawm, ntxuav thiab lwm cov kauj ruam kom huv si thiab smoothness ntawm lub rooj tsavxwm nto thiab nteg ib tug zoo lub hauv paus rau formal tooj liab pouring.
2. Electroless tooj liab plating: Txheej txheej ntawm electroless tooj liab plating kua nyob rau saum npoo ntawm lub rooj tsavxwm Circuit Court chemically ua ke nrog cov ntawv ci tooj liab los ua ib zaj duab xis tooj liab yog ib txoj kev siv tooj liab plating. Qhov kom zoo dua yog tias lub thickness thiab uniformity ntawm tooj liab zaj duab xis tuaj yeem tswj tau zoo.
3. Mechanical tooj liab plating: Qhov saum npoo ntawm Circuit Court board yog them nrog ib txheej ntawm tooj liab ntawv ci los ntawm kev ua txhua yam. Nws kuj yog ib qho ntawm cov txheej txheem tooj liab plating, tab sis tus nqi tsim khoom yog siab dua cov tshuaj tooj liab plating, yog li koj tuaj yeem xaiv siv nws tus kheej.
4. Copper txheej thiab lamination: Nws yog cov kauj ruam kawg ntawm tag nrho cov txheej txheem tooj liab. Tom qab tooj liab plating tiav lawm, cov ntawv xov tooj tooj liab yuav tsum tau nias rau ntawm qhov chaw ntawm lub rooj tsav xwm Circuit Court kom ua tiav kev sib koom ua ke, yog li ua kom cov khoom siv hluav taws xob thiab kev ntseeg siab ntawm cov khoom.
二. Lub luag haujlwm ntawm tooj liab txheej
1. Txo qhov impedance ntawm cov xaim hauv av thiab txhim kho lub peev xwm tiv thaiv kev cuam tshuam;
2. Txo qhov hluav taws xob poob thiab txhim kho lub zog ua haujlwm;
3. Txuas rau hauv av xaim kom txo tau qhov chaw voj voog;
ḉ. Kev ceev faj rau kev nchuav tooj liab
1. Tsis txhob nchuav tooj liab rau hauv qhov chaw qhib ntawm cov xaim nyob rau hauv nruab nrab txheej ntawm multilayer board.
2. Rau ib qho kev sib txuas ntawm ib qho chaw sib txawv, txoj hauv kev yog txuas los ntawm 0 ohm resistors lossis cov hlaws sib nqus lossis inductors.
3. Thaum pib txoj kab tsim, cov xaim hauv av yuav tsum tau ua kom zoo. Koj tsis tuaj yeem tso siab rau kev ntxiv vias tom qab nchuav tooj liab kom tshem tawm cov pins hauv av tsis sib xws.
4. Ncuav tooj liab nyob ze ntawm lub crystal oscillator. Crystal oscillator nyob rau hauv Circuit Court yog ib tug high-frequency emission qhov chaw. Tus txheej txheem yog ncuav tooj liab nyob ib ncig ntawm lub crystal oscillator, thiab tom qab ntawd hauv av lub plhaub ntawm cov siv lead ua oscillator cais.
5. Xyuas kom lub thickness thiab uniformity ntawm tooj liab clad txheej. Feem ntau, lub thickness ntawm tooj liab clad txheej yog nruab nrab ntawm 1-2oz. Ib txheej tooj liab uas tuab dhau los yog nyias dhau yuav cuam tshuam rau kev ua tau zoo thiab cov teeb liab kis tau zoo ntawm PCB. Yog tias cov txheej tooj liab tsis sib npaug, nws yuav ua rau muaj kev cuam tshuam thiab poob ntawm cov teeb liab hauv Circuit Court, cuam tshuam rau kev ua haujlwm thiab kev ntseeg siab ntawm PCB.