Nyob rau hauv cov txheej txheem ntawm pcb tsim thiab ntau lawm, engineers tsis tas yuav tsum tau tiv thaiv kev raug xwm txheej thaum lub sijhawm PCB, tab sis kuj yuav tsum zam cov qauv tsim. Cov lus no sib sau thiab tsom xam cov teeb meem pcb no, vam tias yuav nqa ib qho kev pab rau txhua tus qauv tsim khoom thiab ua haujlwm.

Teeb Meem 1: PCB Board Circuit Court
Qhov teeb meem no yog ib qho kev ua yuam kev uas yuav ua rau lub pcb board tsis ua haujlwm, thiab muaj ntau yam laj thawj rau cov teeb meem no. Cia peb txheeb xyuas ib qho ntawm ib qho hauv qab no.

Qhov loj tshaj plaws ntawm pcb luv Circuit Court yog tsis muaj dab tsi cuam tshuam solder tsim qauv. Nyob rau lub sijhawm no, cov hluav taws xob sib dhos tuaj yeem hloov pauv mus rau lub zes qe kom nce qhov kev ncua deb ntawm cov ntsiab lus kom tiv thaiv luv luv voj voog.

Kev tsim qauv tsim qauv ntawm cov kev taw qhia pcb tseem yuav ua rau pawg thawj coj kom luv luv thiab ua haujlwm tsis tiav. Piv txwv li, yog tias tus pin ntawm sicib yog sib xws rau cov tin yoj, nws yog ib qho yooj yim los ua rau muaj kev huam yuaj ntawm Circuit Court. Nyob rau lub sijhawm no, kev coj ntawm ntu tuaj yeem hloov kho kom haum kom nws txiav kom zoo rau cov nthwv dej.

Muaj lwm qhov tshwm sim uas yuav ua rau cov kab lus luv luv ntawm PCB, uas yog, lub Plug-nyob rau hauv Bent ko taw. Raws li IPC cov lus hais tias qhov ntev ntawm tus lej PIN tsawg dua 2 hli thiab muaj kev txhawj xeeb hais tias cov ntu yuav muaj ntau tshaj 2 hli deb ntawm Circuit Court.

Ntxiv rau ntawm peb qhov laj thawj hais los saum toj no, tseem muaj qee qhov laj thawj uas tuaj yeem ua rau cov kab mob PCB, tsis muaj txiaj ntsig zoo dhau ntawm cov thawj coj ntawm PCB, thiab cov khoom qias neeg tsawg dhau, yog cov ua tsis tiav. Cov kws ua choj tuaj yeem piv cov kev ua tau saum toj no nrog qhov tshwm sim ntawm qhov tsis ua tiav thiab kos ib qho los ntawm ib qho.

Qhov Teeb Meem 2: Cov Neeg Tsaus thiab Grainy tshwm sim ntawm PCB Board
Qhov teeb meem ntawm cov xim tsaus lossis cov pob qij txha me me ntawm PCB feem ntau yog vim cov kev sib kis ntawm cov molder, uas ua rau cov qauv sib txuas nrog cov qauv sib xyaw yog ntau. Ua tib zoo ua tib zoo tsis txhob ntseeg nws nrog cov xim tsaus tsim los ntawm kev siv tshuab nrog cov ntsiab lus tsawg.

Lwm qhov laj thawj rau cov teeb meem no yog qhov sib xyaw ua ke ntawm kev siv hauv kev tsim qauv tau hloov pauv, thiab cov ntsiab lus tsis huv yog qhov siab dhau. Nws yog ib qho tsim nyog los ntxiv cov ntshiab huv lossis hloov cov hlua. Lub iav stain ua rau lub cev hloov pauv hauv cov fiber ntau tsim-nce, xws li kev sib cais ntawm txheej. Tab sis qhov xwm txheej no tsis yog vim yog cov pob qij txha sib luag. Qhov laj thawj yog tias lub substrate yog rhuab siab dhau, yog li nws yog qhov tsim nyog los txo cov preheating thiab solding kub lossis nce qhov ceev ntawm substrate.

Qhov Teeb Meem Peb: PCB solder pob qij qij ua golden daj
Nyob rau hauv ib txwm muaj xwm txheej, tus cam ntawm PCB Board yog cov nyiaj grey, tab sis qee zaus golden solder pob qij txha tshwm sim. Qhov laj thawj tseem ceeb rau cov teeb meem no yog qhov ntsuas kub siab dhau. Nyob rau lub sijhawm no, koj tsuas yog yuav tsum tau txo qhov ntsuas kub ntawm cov hwj cua sov sov.

Lo lus nug 4: Lub rooj tsavxwm tsis zoo kuj cuam tshuam los ntawm ib puag ncig
Vim yog cov qauv ntawm pcb nws tus kheej, nws yooj yim los ua kev puas tsuaj rau lub PCB thaum nws nyob hauv ib puag ncig tsis zoo. Kev kub heev lossis hloov cov av noo, kev siv ntau dhau thiab lwm yam kev mob yog txhua yam uas ua rau muaj kev ua haujlwm ntawm pawg thawj coj lossis txawm txhuam. Piv txwv li, hloov chaw hauv huab cua kub yuav ua rau muaj kev cuam tshuam ntawm Pawg Thawj Coj. Yog li no, cov pob qij txha sib dhos yuav raug rhuav tshem, cov thawj coj yuav tau khoov duav, lossis cov phiaj tooj liab ntawm lub rooj tsav xwm yuav tawg.

Ntawm qhov tod tes, noo noo nyob rau hauv huab cua tuaj yeem ua rau oxidation, xws li cov pob qij txha, cov ntaub qhwv thiab sib xyaw ua ke. Txom ntawm cov av, plua plav, lossis khib nyiab ntawm cov npoo thiab cov rooj sib xyaw ua ke tuaj yeem txo cov huab cua ntws thiab txias ntawm cov khoom siv, ua rau PCB overheating thiab ua rau muaj kev ua phem. Kev co, poob, ntaus lossis khoov rau PCB yuav deform nws thiab ua rau cov PCB tam sim no los yog ua rau cov neeg sib txawv ntawm cov khoom thiab txoj kev laus.

Qhov Teeb Meem Tsib: PCB qhib Circuit Court
Thaum txoj kab tawg, lossis thaum cov solder tsuas yog nyob ntawm cov pob tw thiab tsis yog ntawm cov khoom tiv thaiv, qhib Circuit Court tuaj yeem tshwm sim. Hauv qhov no, tsis muaj kev sib txuas lossis kev sib txuas ntawm cov khoom siv thiab PCB. Ib yam li luv luv voj voog, cov no kuj tseem tshwm sim thaum tsim khoom lossis vuam thiab lwm yam haujlwm. Kev co los yog ncab ntawm cov Circuit Court Board, poob lawv lossis lwm yam kev tsis muaj cov khoom siv tsis zoo yuav rhuav tshem cov leeg lossis cov pob qij txha ua kom puas tsuaj. Ib yam li ntawd, tshuaj lom neeg lossis noo noo tuaj yeem ua rau txhaws lossis cov khoom hlau los hnav, uas tuaj yeem ua rau tiv thaiv ua kom tawg.

Teeb Meem Rau: xoob lossis cov khoom siv tsis raug
Thaum lub sij hawm reflow, cov khoom me me tuaj yeem ntab ntawm molten solder thiab thaum kawg tawm ntawm lub hom phiaj sib koom ua ke. Muaj peev xwm rau kev hloov chaw lossis qaij muaj xws li qhov kev co lossis bounce ntawm cov khoom siv sib xyaw ua ke, cov teeb meem tsis txaus, thiab tib neeg ua yuam kev.

Teeb Meem Xya: Qhov teeb meem vuam
Cov hauv qab no yog qee qhov teeb meem tshwm sim los ntawm kev siv vuam siv tsis zoo:

Kev cuam tshuam nrog cov pob qij qij zeb: cov solder txav ua ntej cov Solorification vim yog kev ntxhov siab sab nraud. Qhov no zoo ib yam li cov pob qij txha txias, tab sis vim li cas txawv. Nws tuaj yeem kho los ntawm kev rov ua kom rov ua kom zoo thiab ua kom pom tseeb tias cov pob qij txha sib tsoo tsis cuam tshuam los ntawm sab nraud thaum lawv txias.

Mob khaub thuas vuam: Qhov xwm txheej no tshwm sim thaum lub tshuab tsis tuaj yeem yaj tau zoo, ua rau muaj kev sib txuas uas tsis ntseeg tau. Txij li thaum dhau los tua tiv thaiv ua tiav melting, cov pob qij txha txias yas kuj tseem tshwm sim. Cov tshuaj yog rov ua kom sib koom ua ke thiab tshem tawm cov solder ntau dhau.

Solder Choj: Qhov no tshwm sim thaum ham crosses thiab lub cev txuas ob leeg ua ke ua ke. Cov no yuav tsim cov kev sib txuas tau zoo thiab luv luv, uas yuav ua rau cov khoom siv los hlawv tawm lossis hlawv tawm cov kab thaum lub siab tam sim no.

Ncoo: tsis txaus plhaw ntawm cov hmoov txhuas lossis txhuas. Ntau dhau los yog cov yas sib tsoo. Cov ntaub qhwv uas tau nce siab vim tias overheating lossis ntxhib soldering.

Teeb Meem Yim: Tib Neeg Yuam Kev
Feem ntau ntawm cov tsis xws luag nyob rau hauv PCB kev tsim khoom yog tshwm sim los ntawm tib neeg kev ua yuam kev. Feem ntau, cov txheej txheem ntau lawm, tsis yog cov khoom siv tsis raug thiab cov khoom lag luam tshwj xeeb tuaj yeem ua rau muaj txog 64% ntawm kev zam cov khoom tsis xws luag. Vim cov laj thawj hauv qab no, qhov ua tau ntawm kev ua kom muaj kev cuam tshuam nrog Circuit Court thiab tus naj npawb ntawm cov txheej txheem ntau lawm: densely ntim khoom siv Ntau lub voj voos txheej; Yas Hlau; sab soldering Cheebtsam; lub zog thiab cov dav hlau av.

Txawm hais tias txhua lub chaw tsim khoom lossis cov sib tham cia siab tias tus kws tsim qauv PCB uas muaj qhov tsis xws luag, tab sis muaj ntau cov txheej txheem tsim teeb meem thiab ntau cov txheej txheem pcb board teeb meem.

Cov teeb meem raug thiab tau tshwm sim muaj xws li cov ntsiab lus hauv qab no: Cov tub ntxhais tsis zoo tuaj yeem ua rau cov kab sib tw luv luv, qhib cov kab sib chaws, thiab lwm yam .; Misalignment ntawm pawg tswj hwm txheej tuaj yeem ua rau kev sib chwv tsis zoo thiab tsis zoo tag nrho; Cov rwb thaiv tsev tsis zoo ntawm cov phiaj tooj liab tuaj yeem ua rau muaj kev khuam thiab cov kab muaj arc ntawm cov xov hlau; Yog tias lub tsheb tooj liab tau muab tso rau hauv qab nruj dhau ntawm txoj kev vias, muaj kev pheej hmoo ntawm Circuit Court; Cov thickness tsis txaus ntawm cov pawg thawj coj ntawm cov Circuit Court yuav ua rau khoov thiab pob txha lov.