Kev kho thiab tswj cov vuam kub
(1) Qhov zoo tshaj plaws vuam tsis zoo ntawm cov cua kub soldering chaw nres tsheb yog qhov zoo tshaj plaws ua ke ntawm vuam nto kub, vuam lub sij hawm thiab cov cua kub ntim ntawm cov cua kub soldering chaw nres tsheb. Thaum teeb tsa peb qhov kev txwv no, tus naj npawb ntawm cov txheej (thickness), thaj chaw, cov khoom siv hlau sab hauv, BGA cov khoom siv (PBGA lossis CBGA) thiab qhov loj me, cov khoom siv tshuaj pleev xim thiab cov nplaum melting point yuav tsum tau txiav txim siab tshwj xeeb tshaj yog thaum teeb tsa peb qhov kev txwv. Tus naj npawb ntawm cov khoom ntawm cov ntawv luam tawm (cov khoom no yuav tsum tau nqus cov cua sov), qhov zoo tshaj plaws kub rau soldering BGA li thiab qhov kub thiab txias lawv tuaj yeem tiv taus, lub sij hawm ntev tshaj plaws soldering, thiab lwm yam. Feem ntau, qhov loj ntawm BGA ntaus ntawv cheeb tsam (ntau tshaj 350 solder npas), qhov nyuaj dua nws yog los teeb tsa qhov tsis sib xws.
(2) Ua tib zoo saib rau plaub qhov chaw kub hauv qab no thaum vuam.
① Preheat cheeb tsam (preheat cheeb tsam). Lub hom phiaj ntawm preheating yog ob zaug: ib qho yog los tiv thaiv ib sab ntawm cov ntawv luam tawm los ntawm kev deformed los ntawm tshav kub, thiab lwm yam yog kom ceev lub melting ntawm solder. Rau cov ntawv luam tawm nrog cov cheeb tsam loj, preheating yog qhov tseem ceeb dua. Vim qhov txwv tsis pub muaj cua sov ntawm cov ntawv luam tawm nws tus kheej, qhov kub thiab txias dua, lub sijhawm cua sov yuav tsum luv dua. Cov ntawv luam tawm ib txwm muaj kev nyab xeeb hauv qab 150 degree (tsis ntev dhau). Feem ntau siv 1.5mm tuab me me cov ntawv luam tawm tuaj yeem teeb qhov kub ntawm 150-160 degree thiab lub sijhawm nyob hauv 90 vib nas this. Tom qab lub BGA ntaus ntawv yog unpacked, nws yuav tsum tau siv nyob rau hauv 24 teev. Yog tias lub pob qhib ntxov dhau, txhawm rau tiv thaiv lub cuab yeej los ntawm kev puas tsuaj thaum rov ua haujlwm (tsim "popcorn" nyhuv), nws yuav tsum tau qhuav ua ntej thauj khoom. Lub tshuab ziab khaub ncaws ua ntej yuav tsum yog 100-110 degree, thiab lub sij hawm ua ntej yuav tsum ntev dua.
② Nruab nrab kub cheeb tsam (soak cheeb tsam). Lub preheating kub nyob rau hauv qab ntawm lub board luam ntawv yuav zoo ib yam li los yog me ntsis siab tshaj qhov preheating kub nyob rau hauv lub preheating cheeb tsam. Qhov kub ntawm lub nozzle yog siab tshaj qhov kub nyob rau hauv lub preheating cheeb tsam thiab qis tshaj nyob rau hauv lub kub cheeb tsam. Lub sijhawm feem ntau yog li 60 vib nas this.
③ Qhov kub thiab txias (qhov chaw siab tshaj). Qhov kub ntawm lub nozzle nce mus txog nws qhov siab tshaj plaws hauv cheeb tsam no. Qhov kub yuav tsum siab tshaj qhov melting point ntawm solder, tab sis zoo dua tsis ntau tshaj 200 degree.
Ntxiv nrog rau kev xaiv kom raug cov cua kub thiab lub sijhawm ntawm txhua cheeb tsam, kev saib xyuas yuav tsum tau them rau cov cua sov. Feem ntau, thaum kub qis dua 100 degree, qhov siab tshaj plaws cua sov tsis tshaj 6 degree / s, thiab qhov siab tshaj plaws cua sov tshaj 100 degree tsis tshaj 3 degree / s; nyob rau hauv qhov chaw txias, qhov siab tshaj plaws cua txias tsis tshaj 6 degree / s.
Muaj qee qhov sib txawv ntawm cov kev txwv saum toj no thaum CBGA (ceramic pob BGA ntaus ntawv) thiab PBGA nti (plastic pob BGA ntaus ntawv) yog soldered: txoj kab uas hla ntawm lub pob solder ntawm CBGA ntaus ntawv yuav tsum yog li 15 feem pua loj dua li ntawm PBGA. ntaus ntawv, thiab cov muaj pes tsawg leeg ntawm cov solder yog 90Sn / 10Pb, siab melting point. Nyob rau hauv txoj kev no, tom qab CBGA ntaus ntawv yog desoldered, cov pob solder yuav tsis lo rau lub board luam ntawv.
Cov nplaum nplaum txuas txuas lub pob ntawm cov khoom siv CBGA rau lub rooj tsavxwm luam tawm tuaj yeem siv tib lub solder li PBGA ntaus ntawv (qhov muaj pes tsawg leeg yog 63Sn / 37Pb), yog li ntawd tom qab BGA ntaus ntawv raug rub tawm, lub pob solder tseem txuas nrog. tus pin ntaus ntawv thiab yuav tsis ua raws li cov ntawv luam tawm. lub rooj tsavxwm
