Kev soj ntsuam ntawm ultrasonic thickness gauge zaub tus nqi yog loj heev los yog me me yog vim li cas
Hauv kev sim ua haujlwm tiag tiag, feem ntau ntsib qhov ntsuas qhov ntsuas thickness thiab tus nqi tsim (lossis xav tau tus nqi) piv rau qhov pom tseeb loj lossis me, cov laj thawj tau txheeb xyuas raws li hauv qab no:
(1), cov ntaub ntawv laminated, cov khoom sib xyaw (tsis yog homogeneous). Txhawm rau ntsuas cov khoom siv laminated uncoupled yog tsis yooj yim sua, vim hais tias ultrasonic tsis tuaj yeem nkag mus rau qhov chaw tsis sib xws, thiab tsis tuaj yeem sib xyaw ua ke hauv cov khoom sib xyaw (tsis yog homogeneous). Rau cov cuab yeej ua los ntawm ntau txheej txheej ntawm cov khoom siv cladding (xws li urea high-pressure khoom), lub thickness ntsuas yuav tsum tau them tshwj xeeb mloog mus rau lub thickness gauge qhia tsuas yog lub thickness ntawm txheej ntawm cov khoom nyob rau hauv kev sib cuag nrog lub sojntsuam.
(2), kev xaiv tsis raug ntawm lub suab nrawm. Ua ntej ntsuas lub workpiece, raws li cov khoom siv preset nws ceev ntawm lub suab los yog raws li tus qauv thaiv rov qab- ntsuas qhov ceev ntawm lub suab. Thaum cov khoom siv ntsuas ntsuas nrog cov khoom siv (feem ntau siv ntsuas thaiv rau cov hlau) thiab tom qab ntawd mus ntsuas lwm cov khoom, yuav ua rau muaj qhov yuam kev.
(3), cov nyhuv ntawm qhov kub thiab txias. Cov khoom siv dav dav hauv kev ceev ntawm lub suab nrog nws qhov kub thiab txias, muaj cov ntaub ntawv kuaj pom tias cov khoom kub txhua qhov nce ntawm 100 ° C, qhov ceev ntawm lub suab txo los ntawm 1%. Rau cov khoom siv kub kub hauv kev pabcuam feem ntau ntsib qhov xwm txheej no.
(4), kev cuam tshuam ntawm tus neeg sawv cev coupling. Coupling tus neeg sawv cev yog siv los tshem tawm cov huab cua ntawm qhov kev sojntsuam thiab cov khoom nyob rau hauv kev sim, kom ultrasonic tsis muaj peev xwm nkag mus rau qhov chaw ua haujlwm kom ua tiav lub hom phiaj ntawm kev tshawb pom. Yog tias qhov kev xaiv ntawm hom lossis siv txoj hauv kev tsis raug, yuav ua rau tsis raug lossis kev sib txuas kos npe flicker, tsis tuaj yeem ntsuas. Hauv kev xyaum, vim yog siv cov coupling tus neeg saib xyuas siv ntau dhau, ua rau kev sojntsuam deb ntawm lub workpiece, qhov ntsuas qhia tau hais tias tus nqi ntawm cov coupling agent txheej thickness tus nqi.
(5), cov khoom ntsuas (xws li cov kav dej) nyob rau hauv qhov tso nyiaj, thaum qhov tso nyiaj thiab qhov sib txawv ntawm qhov workpiece acoustic impedance tsis loj, lub thickness gauge qhia tus nqi ntawm phab ntsa thickness ntxiv rau lub thickness ntawm cov deposit.
(6), kev cuam tshuam ntawm cov hlau nto oxides lossis cov xim pleev xim. Hlau nto tsim ntom oxide los yog xim pleev xim rau txheej txheej, txawm hais tias kev sib xyaw ua ke ntawm ze rau cov khoom siv hauv paus, tsis muaj lub npe pom tseeb interface, tab sis qhov ceev ntawm lub suab nyob rau hauv ob yam khoom nyob rau hauv lub propagation ceev yog sib txawv, yog li ua yuam kev, thiab nrog rau cov kev ceev ntawm lub suab nyob rau hauv ob yam khoom nyob rau hauv lub propagation ceev yog sib txawv, yog li ua yuam kev. thickness ntawm lub npog txawv, qhov loj ntawm qhov yuam kev txawv.
(7), thaum muaj qhov tsis xws luag nyob rau hauv cov khoom (xws li inclusions, interlayers, thiab lwm yam), cov zaub muaj nqis txog li 70% ntawm nominal thickness (lub sij hawm no siv ultrasonic flaw detector rau ntxiv defect nrhiav kom tau).
(8), qhov cuam tshuam ntawm kev ntxhov siab. Cov khoom siv hauv kev pabcuam, cov kav dej, feem ntau ntawm kev muaj kev ntxhov siab, qhov kev ntxhov siab ntawm cov khoom siv muaj qee yam cuam tshuam rau lub suab nrawm, thaum cov kev taw qhia ntawm kev ntxhov siab thiab kev nthuav tawm, yog tias qhov kev ntxhov siab yog compressive kev nyuaj siab, qhov kev ntxhov siab tshwm sim. ntawm lub workpiece elasticity nce, ceev ntawm suab; conversely, yog hais tias qhov kev nyuaj siab yog tensile kev nyuaj siab, lub ceev ntawm lub suab slows down. Thaum qhov kev ntxhov siab thiab nthwv dej propagation tsis zoo ib yam, kev hloov pauv hauv cov txheej txheem ntawm kev co loj ntawm kev cuam tshuam los ntawm kev ntxhov siab, nthwv dej propagation kev sib txawv. Raws li cov ntaub ntawv, qhov kev ntxhov siab dav dav nce, qhov nrawm ntawm lub suab nce qeeb.
