Ua tau zoo precision casting tuam ntxhab paub qhov tseem ceeb ntawm cov txheej txheem tswj kev tsim cov khoom zoo. Cov kev hloov pauv tseem ceeb hauv cov txheej txheem casting muaj xws li pwm kub, pwm rwb thaiv tsev yam ntxwv, lub sij hawm voj voog thiab tus neeg teb xov tooj txoj kev, tab sis cov txheej txheem tseem ceeb tshaj plaws kuj sib txawv yog hlau kub. Nyob rau hauv cov txheej txheem precision casting, muaj ntau yam teeb meem loj hauv kev ntsuas tsis sib cuag ntawm cov hlau kub. Txawm li cas los xij, cov cuab yeej tsim tawm tsis ntev los no tuaj yeem muab cov lus tawm tswv yim ntau ntawm qhov tseeb ntawm lub sijhawm, qhia txog cov teeb meem uas yuav tshwm sim.
Qhov tseem ceeb ntawm qhov kub thiab txias
Nyob rau hauv precision casting txheej txheem, tshwj xeeb tshaj yog nyob rau hauv" equiaxed" txheej txheem, hlau kub yog qhov tseem ceeb tshaj plaws. Yog li ntawd, nws kuj muaj kev cuam tshuam ncaj qha rau ntau yam zoo. Yog tias qhov ntsuas thiab tswj tsis raug, qhov sib txawv ntawm qhov kub ntawm cov hlau yuav cuam tshuam qhov loj ntawm cov tiav castings, grain loj, porosity (nto thiab sab hauv), mechanical zog, khoom zoo (xws li nyiam kub tearing), tag nrho ntawm nyias-walled qhov chaw. , lwm.
Yog li ntawd, kev txhim kho kev ntsuas thiab kev tswj ntawm cov hlau kub yuav txhim kho qhov zoo thiab kev tsim khoom, txo cov nqi tu thiab kev ua haujlwm, txo cov nqi kuaj thiab cov nqi them nqi kho mob.
Kev ntsuas kub tsis yooj yim
Precision casting, tshwj xeeb tshaj yog precision casting siv cov khoom siv induction melting, feem ntau siv qee yam tsis sib cuag infrared radiation thermocouple lossis pyrometer ua thawj lossis thib ob txhais tau tias ntawm kev ntsuas kub ntawm hlau. Cov neeg uas siv cov pyrometers ib txwm yuav tsis nkag siab txog qhov yuam kev ntawm lawv qhov kev ntsuas, tab sis tsuas yog ua tib zoo mloog rau" raug" technical tej yam kev mob ntawm lub twj paj nruag, yog li lawv feem ntau yuam kev. Cov precision technical tej yam kev mob no tsuas yog lub hom phiaj zoo tshaj plaws nyob rau hauv lub chaw soj nstuam ib puag ncig. Qee qhov xwm txheej hauv ntiaj teb tiag tiag tuaj yeem ua rau muaj qhov tsis txaus ntseeg qhov ntsuas qhov ua yuam kev, suav nrog (tab sis tsis txwv rau) cov hauv qab no:
1. Tsis paub meej / hloov emissivity - ntau yam alloys, cuam tshuam los ntawm qhov kub thiab txias yoj, thiab kev hloov pauv hauv kev sib xyaw ua ke thaum ua, tag nrho cov no ua lub luag haujlwm hauv kev tsis tuaj yeem ntawm emissivity.
2. Chav emission: rau kev kub siab melting (ze rau thiab siab tshaj atmospheric siab), cov pa roj ntws los ntawm lub pas dej molten lossis crucible yuav nce lossis txo cov hluav taws xob thermal, uas ua rau muaj kev ua yuam kev.
3. Kev soj ntsuam qhov teeb meem: rau feem ntau cov twj paj nruag, ib qho tsis muaj zog ntawm cov teeb liab yuav ua rau qhov ntsuas kub ntawm qhov ntsuas kub; Cov av ntawm lub qhov rais soj ntsuam cuam tshuam qhov tseeb ntawm feem ntau pyrometers.
4. Kev soj ntsuam lub qhov rais iav khoom: tsis yog txhua lub iav muaj qhov sib kis tau zoo; Ib txhia yog" grey", thaum lub sij hawm transmittance ntawm lwm cov iav hloov nrog wavelength. Qhov no yuav lov tes taw cov pa pyrometer.
5. Calibration: tus qauv kev lag luam yog calibrate ib xyoos ib zaug. Txawm li cas los xij, qhov drift thiab tsis ua haujlwm ntawm qhov ntsuas muaj lawv tus kheej lub sijhawm. Qhov kev coj ua zoo tshaj plaws yog txhawm rau ntsuas tag nrho cov khoom siv kho qhov muag siv hauv lub hoobkas (saib iav lossis tsom iav).
6. Instrument calibration: Aiming los ntawm lub lens xav kom ob txoj kev kho qhov muag sib tshooj kom raug, uas yuav cuam tshuam rau txhua theem ntawm cov pa pyrometers.
Cov teeb meem no tshwj xeeb rau qhov ntsuas kub ntawm qhov muag. Nyob rau tib lub sijhawm, muaj cov txheej txheem cuam tshuam txog kev nyuaj, uas cuam tshuam qhov ntsuas kub ntawm txhua yam ntsuas, suav nrog:
1. Kev lees txais ntau yam ntawm cov txheej txheem sib txawv: tshwj tsis yog tias tag nrho cov melting rauv nyob rau hauv lub xeev ruaj khov (feem ntau, qhov no tsis muaj tseeb), yuav muaj qhov kub thiab txias thaum lub sij hawm casting txheej txheem. Nws yog ib qho tseem ceeb heev uas qhov ntsuas kub no tuaj yeem ua kom cov khoom zoo.
2. Kev muaj peev xwm ua tau zoo: txhua qhov analog rau digital lossis digital rau analog hloov pauv ntawm cov ntsuas ntsuas thiab cov cuab yeej tswj hwm yog qhov muaj peev xwm yuam kev. Qhov dav analog ntau yam ua rau tsis muaj qhov tseeb.
3. Melting tshuab: cov tshuab melting tsis zoo yuav ua rau muaj kev kub ntxhov ntau dhau ntawm cov khoom siv hluav taws xob siab, cuam tshuam rau saum npoo ntawm lub pas dej molten lossis tsim cov khoom siv tshuaj tiv thaiv, tag nrho cov no yuav ua rau qhov yuam kev ntawm cov pa pyrometer.
4. Kev sib txuam ntawm ingot, crucible thiab coil: peb yam ntawm cov txheej txheem melting yog qhov tseem ceeb rau cov yam ntxwv ntawm lub voj voog yaj. Kev sib txuam tsis zoo tuaj yeem ua rau qeeb thiab tsis sib xws, lub zos overheating lossis sputtering. Cov no kuj yog qhov chaw ntawm qhov yuam kev ntawm cov pa pyrometers.
Kev daws teeb meem ntawm qhov kub thiab txias spectrometer
Kev ntsuas kub ntsuas tshuab muaj nws qhov txiaj ntsig zoo: tsis muaj kuab paug thiab lub sensor yuav tsis raug tshuaj lom; Yooj yim rau nruab thiab siv; Kev ntsuas tsis tu ncua yog ua tau; Tsis muaj cov khoom siv; Kev puas tsuaj loj heev (poob ntawm kev ntsuas kev ua haujlwm) yog qhov tsawg heev. Tam sim no, kev nce qib ntawm kev ntsuas kub ntsuas kev tshawb fawb tau daws ntau yam teeb meem cuam tshuam nrog lub ntiaj teb tiag hauv kev siv. Kub kub spectrometer yog ib qho cuab yeej tshiab. Nws yog ib tug kws tshaj lij system multi wavelength pyrometer. Nws muaj peev xwm daws tau cov teeb meem no.
Ntxiv rau qhov muab qhov tseeb tiag tiag hauv ntiaj teb, qhov kub siab zog spectrometer muaj ntau lwm yam zoo: nws tuaj yeem muab tau zoo, kev nyeem ntawv ntawm lub sijhawm thiab kev ua siab ntev (xws li qhov tsis paub meej hauv kev ntsuas) ntawm txhua qhov kev ntsuas; Nws tseem tuaj yeem muab cov teeb liab muaj zog, sib piv ntawm lub hom phiaj thiab lub hom phiaj zoo tagnrho ntawm tib qhov kub thiab txias. Ob txoj haujlwm no tuaj yeem muab cov ntaub ntawv muaj txiaj ntsig txog cov khoom siv raw thiab cov txheej txheem txheej txheem, pab kom paub tseeb tias cov khoom siv alloy raug raug thiab pom tias cov khoom siv hlau puas tau boiled thiab evaporated. Obviously, cov neeg siv kuj tuaj yeem siv cov ntaub ntawv no rau qee qhov chaw tshaj lij ntxiv.
