PCB yog ib qho tseem ceeb ntawm cov khoom siv hluav taws xob niaj hnub no thiab cov khoom siv hluav taws xob sib txuas ntawm cov khoom siv hluav taws xob. Nrog rau kev txhim kho txuas ntxiv ntawm kev siv tshuab hluav taws xob, qhov ceev ntawm PCB tau nce siab dua, yog li muaj ntau thiab ntau qhov yuav tsum tau ua rau cov txheej txheem vuam. Yog li ntawd, nws yog ib qho tsim nyog los tshuaj xyuas thiab txiav txim cov yam cuam tshuam rau PCB vuam zoo thiab nrhiav kom paub qhov ua rau vuam tsis xws luag, thiaj li ua kom lub hom phiaj txhim kho thiab txhim kho tag nrho cov khoom zoo ntawm PCB board. Cia peb saib cov laj thawj ntawm kev vuam tsis zoo ntawm PCB board.

Vim li cas PCB welds muaj qhov tsis xws luag

Ua rau ntawm Circuit Board welding defects yog:

1. Lub weldability ntawm lub Circuit Court board qhov cuam tshuam qhov vuam zoo

Lub qhov weldability ntawm lub rooj tsav xwm Circuit Court tsis zoo, nws yuav ua rau lub vuam virtual tsis xws luag, cuam tshuam rau qhov tsis sib xws ntawm cov khoom hauv Circuit Court, ua rau muaj kev tsis sib haum xeeb ntawm cov khoom sib txuas ntawm cov khoom sib txuas thiab cov kab hauv cov kab, ua rau tsis ua haujlwm ntawm tag nrho cov khoom siv hluav taws xob.

Yuan Kunzhi manufacturing Hoobkas tau cog lus los muab cov neeg muas zaub nrog ib-nres hluav taws xob Cheebtsam hauv internet kev pab cuam, muab phav phav ntawm hluav taws xob Cheebtsam procurement, nqe nug thiab trading, kom paub meej tias tag nrho cov khoom yog los ntawm thawj lub Hoobkas lossis cov neeg sawv cev raws li niaj zaus kom paub meej tias cov khoom qub. qhabnias, yog cov kws tshaj lij hauv tsev hluav taws xob cov khoom siv lub vev xaib

Lub ntsiab yam tseem ceeb cuam tshuam rau lub solderability ntawm cov ntawv luam Circuit Court boards yog:

(1) muaj pes tsawg leeg ntawm solder thiab qhov xwm ntawm lub solder. Solder yog ib qho tseem ceeb ntawm cov txheej txheem kev kho tshuaj welding, nws yog tsim los ntawm cov khoom siv tshuaj lom neeg uas muaj cov flux, feem ntau siv cov ntsiab lus melting qis eutectic hlau yog Sn-Pb lossis Sn-Pb-Ag. Cov ntsiab lus ntawm impurities yuav tsum tau tswj kom tsis txhob muaj oxide tsim los ntawm impurities los ntawm kev yaj los ntawm flux. Lub luag haujlwm ntawm flux yog los pab lub vuam ntub dej ntawm lub voj voog ntawm cov phaj hlau los ntawm kev hloov cov cua sov thiab tshem tawm xeb. Dawb rosin thiab isopropyl cawv feem ntau yog siv.

(2) Vuam kub thiab hlau phaj saum npoo huv yuav cuam tshuam rau weldability. Qhov kub thiab txias yog siab dhau lawm, lub solder diffusion ceev nrawm, lub sijhawm no muaj kev ua haujlwm siab heev, yuav ua rau lub rooj tsav xwm hauv Circuit Court thiab solder melt nto sai sai oxidation, vuam tsis xws luag, Circuit Court board deg paug yuav cuam tshuam rau weldability los tsim qhov tsis xws luag, suav nrog tin hlaws, tin pob, qhib Circuit Court, gloss tsis zoo.

2. Weld tsis xws luag los ntawm warping

Circuit boards thiab Cheebtsam warped thaum lub sij hawm vuam, ua rau muaj kev tsis xws luag xws li virtual welding thiab luv Circuit Court vim kev nyuaj siab deformation. Warping feem ntau yog tshwm sim los ntawm qhov kub thiab txias ntawm qhov nruab nrab thiab qis ntawm lub rooj tsavxwm. Rau PCBS loj, warping kuj tshwm sim thaum lub rooj tsavxwm poob rau hauv nws qhov hnyav. Ordinary PBGA li yog li ntawm 0.5 hli ntawm lub rooj tsav xwm luam tawm. Yog hais tias cov khoom nyob rau hauv lub rooj tsavxwm Circuit Court yog loj, lub solder sib koom yuav nyob rau hauv cov kev nyuaj siab rau ib tug ntev lub sij hawm raws li lub Circuit Court board rov qab mus rau nws zoo li qub tom qab txias. Yog hais tias cov khoom yog tsa los ntawm 0.1 hli, nws yuav txaus ua rau lub virtual vuam qhib Circuit Court.

3, kev tsim ntawm lub rooj tsav xwm Circuit Court cuam tshuam rau vuam zoo

Nyob rau hauv lub layout, qhov loj ntawm lub rooj tsavxwm Circuit Court yog loj heev, txawm hais tias lub vuam yog yooj yim rau kev tswj, tab sis cov tshuab luam ntawv yog ntev, impedance nce, lub peev xwm los tiv thaiv lub suab nrov txo, tus nqi nce; Tsawg dhau, cov cua kub dissipation txo qis, vuam tsis yooj yim rau kev tswj, yooj yim kom pom cov kab uas nyob ib sab cuam tshuam rau ib leeg, xws li electromagnetic cuam tshuam ntawm Circuit Court board. Yog li, PCB board tsim yuav tsum tau optimized:

(1) Txo qhov kev sib txuas ntawm cov khoom siv ntau zaus thiab txo EMI cuam tshuam.

(2) Cov khoom uas muaj qhov hnyav (xws li ntau tshaj 20g) yuav tsum tau kho nrog kev txhawb nqa thiab tom qab ntawd welded.

(3) Thaum tshav kub kub dissipation ntawm cua sov cov ntsiab lus yuav tsum tau txiav txim siab los tiv thaiv loj δ T defects thiab rework, thiab cov ntsiab lus kub rhiab heev yuav tsum tau khaws cia kom deb ntawm cov cua sov.

(4) Cov txheej txheem ntawm cov khoom sib npaug li qhov ua tau, kom tsis yog tsuas yog zoo nkauj thiab yooj yim rau vuam, haum rau ntau lawm. 4∶3 daim duab plaub Circuit Court board tsim yog qhov zoo tshaj plaws. Tsis txhob hloov cov hlau dav kom tsis txhob muaj kev cuam tshuam hauv kev xaim. Thaum lub Circuit Court board yog rhuab rau ib ntev lub sij hawm, tooj liab ntawv ci yog ib qho yooj yim mus nthuav thiab poob tawm. Yog li ntawd, daim ntawv loj tooj liab yuav tsum tau zam.

Hauv cov ntsiab lus, txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhuam nws nws yog qhov tsim nyog yuav tsum tau siv cov khoom siv zoo tshaj plaws, txhim kho kev sib tw ntawm PCB pawg thawj coj saib, thiab tiv thaiv kev sib tsoo kom tsis txhob muaj qhov tsis xws luag hauv cov txheej txheem tsim khoom.