QFN Soldering
1.QFN thiab BGA rework chaw nres tsheb
2.Optical alignemnt system rau mounting
3. Loj IR cua sov cheeb tsam rau motherboard preheating
4.Easy thiab yooj yim rau usded.
Hauj lwm lawm
Txij li thaum cov pob qij txha ntawm QFN yog nyob rau hauv lub pob lub cev, thiab cov tuab yog nyias nyias, X-ray tsis tuaj yeem kuaj pom qhov tsis muaj tin thiab qhib Circuit Court ntawm QFN cov pob qij txha, thiab tsuas yog tso siab rau cov pob qij txha sab nraud los txiav txim ntau npaum li cas. ua tau. Cov txheej txheem rau kev txiav txim qhov tsis xws luag ntawm dot sab ib feem tseem tsis tau tshwm sim hauv IPC tus qauv. Thaum tsis muaj ntau txoj hauv kev rau lub sijhawm tam sim no, peb yuav vam khom ntau ntawm cov chaw sim hauv cov theem tom ntej ntawm kev tsim khoom los txiav txim seb qhov vuam zoo li cas.
Daim duab X-ray tuaj yeem pom, thiab qhov sib txawv ntawm sab sab yog pom tseeb, tab sis cov duab hauv qab uas cuam tshuam tiag tiag rau kev ua haujlwm ntawm kev sib koom ua ke yog tib yam, yog li qhov no coj teeb meem rau kev kuaj X-ray thiab kev txiav txim. Ntxiv cov tin nrog hluav taws xob soldering hlau tsuas yog nce rau sab, thiab X-ray tseem tsis tuaj yeem txiav txim siab npaum li cas nws yuav cuam tshuam rau hauv qab. Raws li ib feem ntawm daim duab loj ntawm qhov pom ntawm qhov sib koom ua ke muaj kev txhawj xeeb, tseem muaj qhov pom tseeb sau ib feem ntawm sab.
Rau QFN rework, vim hais tias lub solder sib koom ua ke yog kiag li nyob rau hauv qab ntawm lub pob khoom, tej yam tsis xws luag xws li txuas hniav, qhib circuits, solder npas, thiab lwm yam yuav tsum tau tshem tawm cov tivthaiv, yog li nws yog me ntsis zoo li BGA rework. QFN yog qhov me me thiab lub teeb hauv qhov hnyav, thiab lawv tau siv rau ntawm cov rooj sib txoos loj, ua rau rov ua haujlwm nyuaj dua li BGA. Tam sim no, QFN rework tseem yog ib feem ntawm tag nrho cov txheej txheem saum npoo av uas yuav tsum tau tsim thiab txhim kho sai sai. Tshwj xeeb, nws yog qhov nyuaj rau siv cov tshuaj txhuam hniav los tsim cov khoom siv hluav taws xob thiab kev sib txuas ntawm QFN thiab cov ntawv luam tawm. Tam sim no, muaj peb txoj hauv kev ua tau zoo ntawm kev siv cov tshuaj txhuam hniav: ib qho yog los luam cov tshuaj pleev xim nrog lub ntsej muag me me ntawm PCB, lwm qhov yog kom pom cov tshuaj pleev xim rau ntawm cov nplaum nplaum ntawm lub rooj sib txoos loj; qhov thib peb yog los luam cov solder paste ncaj qha rau ntawm lub ncoo ntawm cov khoom. Cov txheej txheem saum toj no txhua tus xav tau cov neeg ua haujlwm ua haujlwm zoo heev los ua kom tiav txoj haujlwm. Kev xaiv cov khoom siv rov ua dua tshiab kuj tseem ceeb heev. Nws yuav tsum tsis tsuas yog muaj cov nyhuv zoo heev rau QFN, tab sis kuj tiv thaiv cov khoom los ntawm kev tawg vim huab cua kub heev.
Txhawm rau txhim kho kev ua haujlwm tau zoo, koj yuav zoo dua xaiv ib qho chaw ua haujlwm rov ua haujlwm raws li hauv qab no:
PCB ncoo tsim ntawm QFN yuav tsum ua raws li cov hauv paus ntsiab lus ntawm IPC. Kev tsim cov thermal ncoo yog qhov tseem ceeb. Nws plays lub luag hauj lwm ntawm tshav kub conduction. Nws yuav tsum tsis txhob npog nrog lub npog ntsej muag, tab sis qhov tsim ntawm lub qhov ntawm lub qhov yuav tsum yog lub npog ntsej muag. Thaum tsim cov stencil ntawm lub thermal ncoo, nws yuav tsum tau txiav txim siab tias qhov tso tawm ntawm cov tshuaj nplaum yog 50 feem pua rau 80 feem pua.
Feem ntau, ntau npaum li cas yog qhov tsim nyog muaj feem xyuam rau lub ntsej muag lub ntsej muag ntawm lub qhov ntawm lub qhov, ntawm lub qhov thaum lub sij hawm soldering yog inevitable, kho qhov kub thiab txias nkhaus kom txo qhov porosity. QFN pob yog ib hom tshiab ntawm pob, thiab peb yuav tsum tau ua ntau qhov kev tshawb fawb tob txog PCB tsim, txheej txheem, thiab tshuaj xyuas thiab kho.
QFN pob (Quad Flat No-Lead Package) muaj cov khoom siv hluav taws xob zoo thiab thermal ua haujlwm, me me thiab lub teeb yuag, thiab nws daim ntawv thov loj hlob sai. QFN pob nrog micro txhuas thav duab hu ua MLF pob (micro lead thav duab). Lub pob QFN yog me ntsis zoo ib yam li CSP (chip loj pob), tab sis tsis muaj cov khoom siv nyob rau hauv qab ntawm cov khoom, thiab cov khoom siv hluav taws xob thiab kev sib txuas ntawm PCB yog ua tiav los ntawm kev luam ntawv solder paste rau ntawm PCB ncoo thiab cov pob qij txha tsim. los ntawm reflow soldering.
