Solder Balls yog dab tsi?

Yog tias cov khoom siv tau tshwm sim, lawv tuaj yeem cuam tshuam tag nrho kev ua haujlwm ntawm lub voj vooglub rooj tsavxwm.Cov pob me me yog qhov tsis zoo thiab tuaj yeem txav cov khoom me me tawm ntawm qhov cim.Nyob rau hauv qhov phem tshaj plaws, cov pob loj loj tuaj yeem poob ntawm qhov chaw thiab ua rau qhov zoo ntawm cov pob qij txha.Tsis tas li ntawd, qee lub pob tuaj yeem yobmus rau lwm lub rooj tsavxwm, ua rau luv luv thiab kub hnyiab.

Ob peb lub laj thawj vim li cas cov pob solder tshwm sim muaj xws li:

Excess humidity nyob rau hauv kev tsim kho ib puag ncig
Dampness lossis noo noo ntawm PCB
Ntau dhau flux nyob rau hauv lub solder paste
Kub los yog siab siab dhau lawm thaum lub sij hawm reflow txheej txheem
Kev so tsis txaus thiab ntxuav tom qab rov ua dua
Solder paste yog npaj tsis txaus
Txoj kev tiv thaiv Solder Balls
Nrog rau qhov ua rau ntawm cov pob qij txha hauv siab, koj tuaj yeem siv ntau yam txuj ci thiab kev ntsuas thaum lub sijhawm tsim khoom los tiv thaiv lawv.Qee cov kauj ruam ua tau yog:

1. Txo PCB Moisture
Cov khoom siv hauv PCB tuaj yeem khaws cov dej noo thaum koj muab tso rau hauv kev tsim khoom.Yog tias lub rooj tsavxwm ntub dej thaum koj pib siv cov khoom siv, cov pob solder yuav tshwm sim.Los ntawm kev ua kom lub rooj tsavxwm tsis muaj dej noo liua tau, cov chaw tsim khoom tuaj yeem tiv thaiv lawv los ntawm qhov tshwm sim.

Khaws tag nrho cov PCBs hauv qhov chaw qhuav, tsis muaj qhov chaw nyob ze ntawm cov dej noo.Ua ntej tsim khoom, xyuas txhua lub rooj tsavxwm kom pom cov cim ntawm dampness, thiab qhuav lawv nrog cov ntaub thaiv zoo li qub.Nco ntsoov tias noo noo tuaj yeem hlais hauv cov ntaub qhwv.Ci cov laug cam ntawm 120 degrees Celsius rau plaub teev ua ntej txhua lub voj voog yuav evaporate cov dej noo ntau dhau.

2. Xaiv qhov raug Solder Paste
Cov khoom siv los ua cov khoom siv kuj tuaj yeem tsim cov khoom siv.Cov ntsiab lus hlau ntau dua thiab qis dua oxidation nyob rau hauv lub paste txo txoj hauv kev rau cov pob los tsim, raws li cov solder lub viscosity tiv thaiv nws.los ntawm collapsing thaum rhuab.

Koj tuaj yeem siv flux los pab tiv thaiv oxidation thiab yooj yim rau kev ntxuav ntawm cov laug cam tom qab soldering, tab sis ntau dhau yuav ua rau cov txheej txheem tawg.Xaiv ib qho tshuaj txhuam hniav uas ua tau raws li cov txheej txheem tsim nyog rau lub rooj tsavxwm tau tsim, thiab txoj hauv kev ntawm cov khoom siv hlau yuav poob qis heev.

3. Preheat lub PCB
Raws li cov txheej txheem reflow pib, qhov kub siab dua tuaj yeem ua rau lub sijhawm ntxov melting thiab evaporationntawm lub solder nyob rau hauv xws li ib txoj kev uas yuav ua rau nws mus rau npuas thiab pob.Qhov no tshwm sim los ntawm qhov sib txawv heev ntawm cov khoom siv ntawm lub rooj tsavxwm thiab lub qhov cub.

Txhawm rau tiv thaiv qhov no, preheat cov laug cam kom lawv nyob ze rau qhov cub qhov kub.Qhov no yuav txo qis qhov kev hloov pauv thaum cua sov pib sab hauv, cia lub solder yaj tusyees yam tsis muaj overheating.

4. Tsis txhob nco lub ntsej muag Solder
Cov qhov ncauj qhov ntswg yog ib txheej nyias ntawm polymer siv rau hauv Circuit Court cov kab tooj liab, thiab cov khoom siv tuaj yeem tsim yam tsis muaj lawv.Xyuas kom tseeb tias koj siv cov tshuaj txhuam hniav kom zoo kom tsis txhob muaj qhov sib txawv ntawm cov kab thiab cov ntaub qhwv, thiab xyuas seb lub npog ntsej muag yog nyob rau hauv qhov chaw.

Koj tuaj yeem txhim kho cov txheej txheem no los ntawm kev siv cov cuab yeej ua tau zoo thiab tseem los ntawm kev ua kom qeeb ntawm tus nqi ntawm cov laug cam preheated.Qhov qis dua preheat tus nqi tso cai rau lub solder kis tusyees yam tsis tau tawm qhov chaw rau cov khoom.

5. Txo PCB Mounting Stress
Cov kev ntxhov siab muab tso rau ntawm lub rooj tsavxwm thaum nws tau mounted tuaj yeem ncab lossis ua kom cov kab thiab cov ntaub qhwv.Ntau sab hauv siab thiab cov ntaub qhwv yuav raug thawb kaw;kev ntxhov siab ntau dhau los thiab lawv yuav raug rub qhib.

Thaum lawv qhib dhau lawm, lub solder yuav raug thawb tawm, thiab yuav tsis txaus nyob rau hauv lawv thaum lawv kaw.Xyuas kom tseeb tias lub rooj tsavxwm tsis raug ncab los yog crushed ua ntej ntau lawm, thiab qhov tsis raug ntawm solder yuav tsis pob.

6. Muab ob npaug rau kos Pad Spacing
Yog tias cov ntaub qhwv ntawm lub rooj tsavxwm nyob rau hauv qhov chaw tsis raug lossis nyob ze lossis nyob deb, qhov no tuaj yeem ua rau cov khoom sib txuas tsis raug.Yog tias cov pob khaus ua tiav thaum cov ntaub qhwv tsis raug tso, qhov no ua rau muaj kev pheej hmoo tias lawv yuav poob thiab ua rau luv.

Xyuas kom meej tias tag nrho cov phiaj xwm muaj cov ntaub qhwv nyob rau ntawm qhov chaw zoo tshaj plaws thiab txhua lub rooj tsavxwm tau luam tawm kom raug.Tsuav lawv yog txoj cai mus rau hauv, yuav tsum tsis muaj teeb meem nrog lawv tawm.

7. Khaws qhov muag ntawm Stencil Cleaning
Tom qab txhua qhov dhau los, koj yuav tsum tau ntxuav cov khoom siv ntau dhau los yog flux tawm ntawm stencil.Yog tias koj tsis khaws ntau dhau hauv daim tshev, lawv yuav raug xa mus rau cov laug cam yav tom ntej thaum lub sijhawm tsim khoom.Cov ntau dhau no yuav hlaws rau ntawm qhov chaw los yog cov ntaub qhwv thiab ua cov pob.

Nws yog qhov zoo los ntxuav cov roj ntau dhau thiab solder los ntawm cov stencil tom qab txhua qhov sib txawv kom tsis txhob muaj cov khoom tsim.Tseeb, nws tuaj yeem siv sijhawm ntev, tab sis nws yog qhov zoo dua los nres qhov teeb meem ua ntej nws hnyav dua.

Solder balls yog cov bane ntawm txhua tus neeg tsim khoom ntawm EMS.Lawv cov teeb meem yog qhov yooj yim, tab sis lawv qhov ua rau muaj ntau dhau.Hmoov zoo, txhua theem ntawm cov txheej txheem tsim khoom muab txoj hauv kev tshiab los tiv thaiv lawv los ntawm qhov tshwm sim.

Txheeb xyuas koj cov txheej txheem tsim khoom thiab pom qhov twg koj tuaj yeem siv cov kauj ruam saum toj no los tiv thaiv covtsim cov khoom siv hauv SMT kev tsim khoom.