Kev xaiv ntawm PCBA tin penetration kuj tseem ceeb heev hauv cov txheej txheem PCBA. Hauv kev dhau los ntawm - qhov txheej txheem plugin, qhov tsis zoo ntawm cov tin nkag ntawm PCB boards tau yooj yim ua rau muaj teeb meem xws li cov pob qij txha, tin tawg, thiab txawm tias qhov chaw poob.
Muaj ob lub ntsiab lus tseem ceeb kom nkag siab txog PCBA tin penetration:
1, PCBA Tin Penetration Requirements
Raws li tus qauv IPC, PCBA tin penetration yuav tsum tau los ntawm - qhov sib txuas ntawm cov pob qij txha feem ntau yog siab tshaj 75%, uas txhais tau hais tias cov txheej txheem tin nkag mus rau qhov kev tshuaj xyuas ntawm cov welded nto ntawm sab nraud ntawm lub rooj tsavxwm tsis tsawg dua 75% ntawm qhov siab qhov siab (board thickness), thiab PCBA tin 10% yog qhov tsim nyog ntawm 75%. PCBA xav tau ntau tshaj 50% tin nkag mus thaum lub plated los ntawm - qhov txuas nrog rau cov cua kub dissipation txheej los yog thermal conductive txheej uas plays lub tshav kub dissipation lub luag hauj lwm.
2, Cov yam ntxwv cuam tshuam rau tin nkag ntawm PCBA
Qhov tsis zoo tin nkag ntawm PCBA feem ntau cuam tshuam los ntawm cov khoom siv, cov txheej txheem yoj vuam, flux, thiab phau ntawv vuam.
Kev tsom xam tshwj xeeb ntawm yam cuam tshuam rau PCBA tin penetration:
1. Khoom siv
Tin melted ntawm qhov kub thiab txias muaj zog permeability, tab sis tsis yog tag nrho cov soldered hlau (PCB boards, Cheebtsam) tuaj yeem nkag mus. For example, aluminum metal usually forms a dense protective layer on its surface, and the different molecular structures inside make it difficult for other molecules to penetrate. Qhov thib ob, yog tias muaj txheej oxide nyob rau saum npoo ntawm cov hlau welded, nws tseem yuav tiv thaiv kev nkag mus ntawm cov molecules. Peb feem ntau siv flux los yog gauze los txhuam nws kom huv si.
2. Wave soldering txheej txheem
Qhov tsis zoo ntawm tin nkag ntawm PCBA yog ncaj qha ntsig txog cov txheej txheem yoj soldering, thiab cov vuam tsis zoo nrog cov hlau tsis zoo, xws li yoj qhov siab, qhov kub thiab txias, lub sij hawm soldering, los yog txav ceev, yuav tsum tau kho kom zoo dua. Ua ntej, lub orbital lub kaum sab xis yuav tsum tau txo qis kom tsim nyog thiab qhov siab ntawm lub ncov nthwv dej yuav tsum tau nce ntxiv kom muaj kev sib cuag ntawm cov kua tin thiab cov khoom sib txuas; Tom qab ntawd, nce qhov kub ntawm lub ncov soldering. Feem ntau hais lus, qhov siab dua qhov kub, qhov muaj zog permeability ntawm tin, tab sis qhov no yuav tsum xav txog qhov kub thiab txias ntawm cov khoom; Thaum kawg, qhov ceev ntawm txoj siv conveyor tuaj yeem txo qis, preheating thiab vuam lub sij hawm tuaj yeem nce ntxiv, kom cov flux tuaj yeem tshem tawm oxides, nkag mus rau qhov kawg vuam, thiab txhim kho cov tin noj.
3. Flux
Soldering flux kuj yog ib qho tseem ceeb cuam tshuam rau qhov tsis zoo tin nkag ntawm PCBA. Soldering flux feem ntau ua lub luag haujlwm hauv kev tshem tawm cov oxides ntawm PCBs thiab cov khoom, nrog rau kev tiv thaiv rov oxidation thaum lub sijhawm vuam. Kev xaiv tsis zoo ntawm cov khoom siv hluav taws xob, cov txheej txheem tsis sib xws, thiab cov nyiaj tsis txaus yuav ua rau cov khoom tsis zoo. Lub npe nrov fluxes tuaj yeem siv tau, uas muaj kev ua kom siab dua thiab ntub dej, thiab tuaj yeem tshem tawm cov oxides uas nyuaj rau tshem tawm; Txheeb xyuas qhov soldering flux nozzle. Cov nozzles puas yuav tsum tau hloov raws sijhawm kom ntseeg tau tias qhov tsim nyog ntawm cov khoom siv hluav taws xob tau siv rau saum npoo ntawm PCB pawg thawj coj saib thiab ua kom cov txiaj ntsig zoo tshaj plaws ntawm cov flux.
4. Kev tuav vuam
Nyob rau hauv qhov tseeb zoo soj ntsuam ntawm plug- nyob rau hauv vuam, ib tug ntau ntawm cov welded qhov chaw tsuas yog tsim ib tug conical zoo tom qab soldering nto, thiab tsis muaj tin nkag mus rau hauv los ntawm - qhov. Hauv kev sim ua haujlwm, nws tau lees paub tias ntau qhov ntawm cov khoom no yog cov khoom siv hluav taws xob, uas muaj ntau dua hauv phau ntawv ntsaws- hauv vuam vim qhov kub tsis zoo ntawm cov hlau soldering thiab lub sij hawm luv luv soldering. Tsis zoo tin nkag mus rau hauv PCBA tuaj yeem ua rau muaj teeb meem virtual soldering, nce tus nqi kho. Yog tias muaj kev xav tau siab rau PCBA tin nkag mus thiab nruj vuam zoo yuav tsum tau, xaiv yoj soldering tuaj yeem siv los txo cov teeb meem tsis zoo ntawm PCBA tin nkag.
