Txhawm rau kom paub txog kev tswj cua ceev thiab huab cua ntim, ob lub ntsiab lus yuav tsum tau them nyiaj rau:
- Qhov ceev ntawm lub kiv cua yuav tsum tau tswj los ntawm zaus hloov dua siab tshiab kom txo tau qhov cuam tshuam ntawm voltage hloov ntawm nws;
- Txo qhov tso pa tawm ntawm cov khoom siv, vim tias qhov nruab nrab ntawm cov pa tawm hauv nruab nrab feem ntau tsis ruaj khov, uas yooj yim cuam tshuam rau cov cua kub hauv qhov cub.
- Khoom ruaj khov
Tam sim ntawd peb tau txais qhov kev pom zoo ntawm qhov cub kub qhov nkhaus qhov chaw, tab sis kom ua tiav nws, kev ruaj ntseg, rov ua dua thiab sib xws ntawm cov cuab yeej yuav tsum tau lav nws.Tshwj xeeb tshaj yog rau cov khoom tsis muaj hlau lead, yog tias lub qhov cub kub kub nkhaus drifts me ntsis vim yog cov khoom siv, nws yooj yim dhia tawm ntawm cov txheej txheem qhov rais thiab ua rau txias soldering los yog kev puas tsuaj rau cov khoom qub.Yog li ntawd, ntau thiab ntau manufacturers tau pib muab tso rau pem hauv ntej stability xeem yuav tsum tau rau cov khoom.
l Kev siv cov nitrogen
Nrog rau qhov tshwm sim ntawm lub sijhawm tsis muaj hlau lead, txawm hais tias reflow soldering yog sau nrog nitrogen tau dhau los ua lub ntsiab lus kub ntawm kev sib tham.Vim lub fluidity, solderability, thiab wettability ntawm lead-free solders, lawv tsis zoo li txhuas solders, tshwj xeeb tshaj yog thaum lub Circuit Court board pads txais cov txheej txheem OSP (organic tiv thaiv zaj duab xis liab qab tooj liab board), cov ntaub yog yooj yim rau oxidize, feem ntau ua rau cov pob qij txha ntawm cov pob qij txha Lub wetting lub kaum sab xis loj heev thiab cov ntaub qhwv tau raug tooj liab.Txhawm rau txhim kho qhov zoo ntawm cov pob qij txha, qee zaum peb yuav tsum siv nitrogen thaum rov ua dua.Nitrogen yog ib qho kev tiv thaiv tsis muaj roj, uas tuaj yeem tiv thaiv lub rooj tsav xwm hauv Circuit Court pads los ntawm oxidation thaum lub sij hawm soldering, thiab txhim kho cov solderability ntawm cov hlau lead-free solders (Daim duab 5).
Daim duab 5 Vuam ntawm hlau thaiv nyob rau hauv ib puag ncig uas muaj nitrogen
Txawm hais tias ntau lub tuam txhab tsim khoom siv hluav taws xob tsis siv nitrogen ib ntus vim qhov kev txiav txim siab ntawm cov nqi khiav lag luam, nrog kev txhim kho txuas ntxiv ntawm cov kev xav tau zoo ntawm cov hlau lead-free soldering, kev siv cov nitrogen yuav dhau los ua ntau dua.Yog li ntawd, ib qho kev xaiv zoo dua yog tias txawm tias nitrogen tsis tas yuav tsum tau siv hauv kev tsim khoom tiag tiag tam sim no, nws yog qhov zoo dua los tawm hauv cov khoom siv nrog nitrogen filling interface kom ntseeg tau tias cov cuab yeej muaj qhov yooj yim kom ua tau raws li cov kev xav tau ntawm nitrogen filling ntau lawm yav tom ntej.
l Cov cuab yeej ua kom txias txias thiab tswj cov dej ntws
Qhov kub ntawm cov hlau lead-dawb ntau lawm yog qhov siab dua li cov hlau lead, uas ua rau muaj kev xav tau ntau dua rau kev ua haujlwm txias ntawm cov khoom siv.Tsis tas li ntawd, qhov kev tswj tau nrawm dua tuaj yeem ua rau cov hlau lead-dawb solder sib koom ua ke ntau dua, uas yuav pab txhim kho lub zog ntawm cov khoom sib koom ua ke.Tshwj xeeb tshaj yog thaum peb tsim Circuit Court boards nrog lub peev xwm loj thaum tshav kub kub xws li kev sib txuas lus backplanes, yog tias peb tsuas yog siv cov cua txias, nws yuav nyuaj rau cov Circuit Court boards kom tau raws li qhov yuav tsum tau ua kom txias ntawm 3-5 degrees ib ob thaum lub caij txias, thiab qhov cua txias tsis tuaj yeem. ncav cuag qhov yuav tsum tau yuav loosen cov qauv sib koom ua ke thiab cuam tshuam ncaj qha rau kev ntseeg siab ntawm kev sib koom ua ke.Yog li ntawd, kev tsim khoom tsis muaj hmoov txhuas yog pom zoo kom xav txog kev siv cov khoom siv dej txias dual-kho, thiab qhov chaw txias ntawm cov khoom siv yuav tsum tau teeb tsa raws li qhov xav tau thiab tswj tau tag nrho.
Cov hmoov txhuas tsis muaj hmoov txhuas feem ntau muaj cov flux ntau, thiab cov khoom siv hluav taws xob tau yooj yim mus rau hauv lub qhov cub, uas cuam tshuam rau cov khoom siv hluav taws xob hloov hluav taws xob, thiab qee zaum txawm poob rau ntawm lub rooj tsav xwm hauv lub tshuab hluav taws xob ua rau muaj kuab paug.Muaj ob txoj hauv kev kom tso tawm cov dej ntws tawm thaum lub sijhawm tsim khoom;
(1) Tso pa tawm
Kev tso pa tawm yog txoj hauv kev yooj yim tshaj plaws los tso tawm cov khoom seem.Txawm li cas los xij, peb tau hais hauv tsab xov xwm dhau los tias cov pa tawm ntau dhau yuav cuam tshuam rau kev ruaj ntseg ntawm cov cua kub ntws hauv cov kab noj hniav.Tsis tas li ntawd, qhov nce ntawm cov pa tawm yuav ncaj qha ua rau muaj kev siv zog ntxiv (xws li hluav taws xob thiab nitrogen).
(2) Multi-level flux tswj system
Flux tswj system feem ntau suav nrog cov cuab yeej lim dej thiab cov khoom siv condensing (Daim duab 6 thiab daim duab 7).Cov cuab yeej lim dej tau zoo sib cais thiab lim cov khoom hauv cov khoom seem hauv cov dej ntws, thaum lub tshuab cua txias condenses cov gaseous flux residue rau hauv cov kua hauv lub tshav kub exchanger, thiab thaum kawg sau nws rau hauv lub tais ntim rau hauv nruab nrab kev ua haujlwm.
Daim duab 6 Filtering ntaus ntawv nyob rau hauv lub flux tswj system
Daim duab 7 Condensing ntaus ntawv nyob rau hauv lub flux tswj system
Post lub sij hawm: Aug-12-2020