Hauv kev ua PCBA, qhov vuam zoo ntawm lub rooj tsav xwm hauv Circuit Court muaj qhov cuam tshuam zoo rau kev ua haujlwm thiab qhov zoo ntawm lub rooj tsavxwm. Yog li ntawd, nws yog ib qho tseem ceeb heev los tswj cov vuam zoo ntawm PCB Circuit Board.PCB Circuit Boardwelding zoo yog zoo sib xws nrog Circuit Court board tsim, txheej txheem cov ntaub ntawv, vuam tshuab thiab lwm yam.
Ib, Tsim ntawm PCB Circuit Board
1. Puab tsim
(1) Thaum tsim cov ntaub qhwv ntawm cov khoom sib txuas, lub ncoo loj yuav tsum tsim kom tsim nyog. Yog tias lub ncoo loj dhau, qhov chaw sib kis loj heev, thiab cov pob qij txha tsim tsis puv. Ntawm qhov tod tes, qhov nro ntawm cov ntawv ci tooj liab ntawm lub ncoo me me yog qhov me me dhau, thiab cov pob qij txha uas tsim los yog cov pob qij txha uas tsis yog ntub dej. Qhov sib txawv ntawm qhov aperture thiab cov khoom siv lead ua yog qhov loj heev thiab nws yog ib qho yooj yim los ua qhov tsis tseeb soldering. Thaum lub aperture yog 0.05 - 0.2 hli dav dua cov hlau lead thiab lub ncoo txoj kab uas hla yog 2 - 2.5 npaug ntawm lub aperture, nws yog ib qho zoo tagnrho rau vuam.
(2) Thaum tsim cov ntaub qhwv ntawm cov khoom siv nti, cov ntsiab lus hauv qab no yuav tsum tau txiav txim siab: txhawm rau tshem tawm "tus duab ntxoov ntxoo" ntau npaum li qhov ua tau, cov terminals lossis pins ntawm SMD yuav tsum fim cov kev taw qhia ntawm cov tin ntws los pab txhawb. tiv nrog cov tin flow. Txo cov soldering cuav thiab tsis muaj soldering. Cov khoom me me yuav tsum tsis txhob muab tso rau tom qab cov khoom loj dua los tiv thaiv cov khoom loj los ntawm kev cuam tshuam nrog cov dej ntws thiab kev sib cuag nrog cov ntaub qhwv ntawm cov khoom me me, uas ua rau cov khoom tawg.
2, PCB Circuit Court board flatness tswj
Wave soldering muaj qhov xav tau siab ntawm qhov flatness ntawm cov ntawv luam tawm. Feem ntau, lub warpage yuav tsum tsawg dua 0.5mm. Yog tias nws loj dua 0.5 hli, nws yuav tsum tau flattened. Hauv particular, cov thickness ntawm qee cov ntawv luam tawm tsuas yog li 1.5 hli, thiab lawv cov kev xav tau ntawm warpage yog siab dua. Txwv tsis pub, qhov vuam zoo tsis tuaj yeem lav. Cov teeb meem hauv qab no yuav tsum tau them rau:
(1) Khaws cov ntawv luam tawm thiab cov khoom kom raug thiab txo lub sijhawm cia kom ntau li ntau tau. Thaum lub sij hawm vuam, tooj liab ntawv ci thiab cov khoom ua rau tsis muaj plua plav, roj, thiab oxides yog qhov tsim nyog rau kev tsim cov pob qij txha tsim nyog. Yog li ntawd, cov ntawv luam tawm thiab cov khoom siv yuav tsum tau muab cia rau hauv qhov chaw qhuav. , nyob rau hauv ib puag ncig huv si, thiab txo lub sij hawm cia kom ntau li ntau tau.
(2) Rau cov ntawv luam tawm uas tau muab tso rau lub sijhawm ntev, qhov chaw feem ntau yuav tsum tau ntxuav. Qhov no tuaj yeem txhim kho cov solderability thiab txo qhov tsis tseeb soldering thiab bridging. Rau cov pins tivthaiv nrog ib qho degree ntawm oxidation nto, yuav tsum tau muab tshem tawm ua ntej. oxide txheej.
二. Kev tswj kom zoo ntawm cov ntaub ntawv txheej txheem
Nyob rau hauv yoj soldering, cov txheej txheem tseem ceeb cov ntaub ntawv siv yog: flux thiab solder.
1. Daim ntawv thov ntawm flux tuaj yeem tshem tawm cov oxides ntawm qhov chaw vuam, tiv thaiv kev rov oxidation ntawm lub vuam thiab vuam nto thaum lub sij hawm vuam, txo qhov nro ntawm lub vuam, thiab pab hloov cov cua sov mus rau qhov chaw vuam. Flux plays lub luag haujlwm tseem ceeb hauv kev tswj cov vuam zoo.
2. Kev tswj zoo ntawm solder
Tin-lead solder txuas ntxiv mus oxidize ntawm qhov kub siab (250 ° C), ua rau cov ntsiab lus ntawm cov tin-lead solder nyob rau hauv lub lauj kaub tin kom tsis tu ncua thiab deviate los ntawm eutectic point, uas ua rau tsis zoo fluidity thiab zoo teeb meem xws li tas li. soldering, npliag soldering, thiab tsis txaus solder sib koom lub zog. .
三 、 Vuam txheej txheem parameter tswj
Kev cuam tshuam ntawm cov txheej txheem welding tsis nyob ntawm qhov chaw vuam zoo yog qhov nyuaj.
Muaj ob peb lub ntsiab lus tseem ceeb: 1. Kev tswj ntawm qhov kub thiab txias. 2. Vuam khiav inclination lub kaum sab xis. 3. Wave crest qhov siab. 4. Vuam kub.
Vuam yog cov txheej txheem tseem ceeb hauv cov txheej txheem tsim khoom ntawm PCB Circuit Board. Txhawm rau kom ntseeg tau qhov vuam zoo ntawm lub rooj tsav xwm hauv Circuit Court, ib tus yuav tsum paub zoo txog kev tswj xyuas zoo thiab kev txawj vuam.
