Cov yam ntxwv cuam tshuam rau qhov taw qhia tus nqi ntawm ultrasonic thickness gauge
(1) Qhov roughness ntawm lub workpiece yog loj heev, ua rau tsis zoo coupling ntawm lub sojntsuam thiab kev sib cuag nto, tsis tshua muaj reflected echo, thiab txawm tsis muaj peev xwm tau txais echo signals.
Rau qhov chaw corrosion thiab cov khoom siv hauv kev pabcuam thiab cov kav dej uas muaj kev sib txuas tsis zoo, qhov chaw tuaj yeem kho tau los ntawm kev sib tsoo, sib tsoo, fringing, thiab lwm yam kom txo tau qhov roughness. Nyob rau tib lub sijhawm, cov oxide thiab cov xim pleev xim tuaj yeem raug tshem tawm kom nthuav tawm cov xim hlau nplaum thiab ua rau kev sojntsuam Ib qho kev sib txuas zoo tuaj yeem ua tiav nrog cov khoom kuaj los ntawm tus neeg sawv cev coupling.
(2) Lub vojvoog ntawm curvature ntawm lub workpiece yog me me heev, tshwj xeeb tshaj yog thaum ntsuas cov thickness ntawm cov kav me me. Txij li qhov saum npoo ntawm cov kev sojntsuam siv feem ntau yog tiaj tus thiab kev sib cuag nrog lub ntsej muag nkhaus yog qhov chaw sib cuag lossis kab sib cuag, lub suab sib txuas yog qis (tsis zoo coupling). Ib qho kev sojntsuam tshwj xeeb rau cov yeeb nkab me me diameters (6mm) tuaj yeem siv los ntsuas cov ntaub ntawv nkhaus zoo li cov kav dej.
(3) Qhov chaw kuaj pom thiab qhov chaw hauv qab tsis yog sib npaug, thiab lub suab tsis tau tawg thaum lawv ntsib qhov chaw hauv qab, thiab qhov kev sojntsuam tsis tuaj yeem tau txais lub teeb liab hauv qab.
(4) Vim yog cov qauv tsis sib xws lossis cov nplej ntxhib ntawm cov hlau castings thiab cov hlau austenitic, tawg tawg loj heev tshwm sim thaum ultrasonic tsis dhau los ntawm lawv. Lub ultrasonic tsis tawg pleb propagate raws txoj kev nyuaj, uas tej zaum yuav annihilate lub echoes thiab ua rau tsis muaj zaub. . Ib coarse-grain tshwj xeeb sojntsuam nrog qis zaus (2.5MHz) tuaj yeem siv.
(5) Muaj qee qhov hnav ntawm qhov chaw sojntsuam. Qhov saum npoo ntawm feem ntau siv thickness ntsuas probes yog ua los ntawm acrylic resin. Kev siv lub sij hawm ntev yuav ua rau kom lub ntsej muag roughness, ua rau txo qis rhiab heev, ua rau cov zaub tsis raug. Koj tuaj yeem siv 500 # daim ntawv xuab zeb los txhuam nws kom nws du thiab ua kom muaj kev sib luag. Yog tias nws tseem tsis ruaj khov, xav txog kev hloov qhov kev sojntsuam.
(6) Muaj ntau qhov chaw corrosion nyob rau sab nraub qaum ntawm cov khoom raug kuaj. Vim tias muaj cov pob zeb xeb thiab cov qhov dej corrosion ntawm sab nraud ntawm cov khoom yuav tsum tau ntsuas, lub suab tsis muaj zog, ua rau kev nyeem ntawv hloov pauv tsis tu ncua, lossis txawm tias tsis muaj kev nyeem ntawv hauv qhov xwm txheej hnyav.
(7) Muaj cov khib nyiab hauv cov khoom yuav ntsuas (xws li cov yeeb nkab). Thaum lub acoustic impedance ntawm sediment thiab lub workpiece tsis sib txawv ntau, tus nqi tso tawm los ntawm lub thickness gauge yog phab ntsa thickness ntxiv rau sediment thickness.
(8) Thaum muaj qhov tsis xws luag hauv cov khoom siv (xws li suav nrog, interlayers, thiab lwm yam), tus nqi tso tawm yog kwv yees li 70% ntawm nominal thickness. Nyob rau lub sijhawm no, lub tshuab kuaj xyuas ultrasonic tuaj yeem siv los kuaj xyuas qhov tsis zoo ntxiv.
(9) Qhov kub thiab txias. Feem ntau, lub suab nrawm hauv cov khoom siv txo qis thaum kub nce. Kev sim cov ntaub ntawv qhia tau hais tias rau txhua txhua 100 degree nce hauv cov ntaub ntawv kub, lub suab ceev txo los ntawm 1%. Qhov xwm txheej no feem ntau ntsib rau cov khoom siv kub kub hauv kev pabcuam. Kev sojntsuam tshwj xeeb rau qhov kub thiab txias (300 degree ~ 600 degree) yuav tsum tau siv. Tsis txhob siv cov kev sojntsuam zoo tib yam.
(10) Cov ntaub ntawv laminated, cov ntaub ntawv sib xyaw (heterogeneous). Kev ntsuas cov ntaub ntawv laminated tsis tuaj yeem ua tsis tau vim tias ultrasonic tsis tuaj yeem nkag mus rau qhov chaw tsis sib xws thiab tsis tuaj yeem nthuav tawm ib yam ntawm cov khoom sib xyaw (heterogeneous). Rau cov cuab yeej ua los ntawm cov ntaub ntawv ntau txheej (xws li urea high-pressure khoom), yuav tsum tau them nyiaj tshwj xeeb thaum ntsuas thickness. Qhov taw qhia tus nqi ntawm lub thickness ntsuas tsuas yog qhia lub thickness ntawm txheej ntawm cov khoom nyob rau hauv kev sib cuag nrog lub sojntsuam.
(11) Kev cuam tshuam ntawm coupling tus neeg sawv cev. Coupling tus neeg sawv cev yog siv los tshem tawm cov huab cua ntawm qhov kev sojntsuam thiab cov khoom raug ntsuas, kom ultrasonic tsis muaj peev xwm nkag mus rau hauv qhov chaw ua haujlwm kom pom lub hom phiaj. Yog tias hom raug xaiv lossis siv tsis raug, qhov yuam kev yuav tshwm sim lossis cov cim txuas txuas yuav flash, ua rau kev ntsuas tsis tuaj yeem.
Hom tsim nyog yuav tsum raug xaiv raws li kev siv cov xwm txheej. Thaum siv rau ntawm cov khoom siv du, tsis tshua muaj viscosity coupling agents tuaj yeem siv tau; Thaum siv rau ntawm qhov chaw ntxhib, qhov chaw ntsug thiab sab saum toj, cov viscosity siab coupling yuav tsum tau siv. High kub coupling tus neeg sawv cev yuav tsum tau siv rau high kub workpieces.
Qhov thib ob, tus neeg sawv cev sib txuas yuav tsum tau siv rau hauv tus nqi tsim nyog thiab thov sib npaug. Feem ntau, tus neeg sawv cev sib txuas yuav tsum tau siv rau saum npoo ntawm cov khoom raug ntsuas, tab sis thaum ntsuas qhov ntsuas kub siab, tus neeg sawv cev sib txuas yuav tsum tau siv rau kev sojntsuam.
(12) Kev xaiv lub suab tsis raug. Ua ntej ntsuas lub workpiece, preset nws lub suab tshaj tawm raws li cov khoom siv los yog rov qab ntsuas lub suab tshaj tawm raws li tus qauv thaiv. Thaum lub ntsuas ntsuas tau ntsuas nrog ib qho khoom siv (qhov kev sim siv feem ntau yog hlau) thiab tom qab ntawd ntsuas nrog lwm cov khoom, cov txiaj ntsig yuam kev yuav raug tsim. Nws yog qhov yuav tsum tau hais tias cov khoom siv yuav tsum raug txheeb xyuas kom raug thiab lub suab nrawm raug xaiv ua ntej ntsuas.
(13) Kev ntxhov siab. Feem ntau ntawm cov khoom siv thiab cov kav dej hauv kev pabcuam 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 kev ntxhov siab yog ua raws li cov lus qhia kev nthuav tawm, yog tias qhov kev ntxhov siab yog compressive kev nyuaj siab, qhov kev ntxhov siab yuav ua rau kom elasticity ntawm lub workpiece thiab ua kom lub suab nrawm; rov qab. , yog hais tias qhov kev nyuaj siab yog tensile kev nyuaj siab, lub suab qeeb qeeb.
Thaum qhov kev ntxhov siab tsis sib haum nrog kev nthuav tawm ntawm nthwv dej, qhov kev vibration trajectory ntawm cov khoom cuam tshuam los ntawm kev ntxhov siab thaum lub sij hawm nthwv dej, thiab kev nthuav tawm ntawm yoj deviates. Raws li cov ntaub ntawv, raws li kev ntxhov siab dav dav, qhov ceev ntawm lub suab nce qeeb.
(14) Kev cuam tshuam ntawm cov hlau nto oxides lossis xim txheej. Txawm hais tias tus oxide ntom lossis xim los tiv thaiv xeb ntawm cov khoom siv hlau thiab tsis muaj qhov sib xyaw ua ke nrog cov khoom sib xyaw ua ke, yog li ua rau tsis txawv, thiab qhov yuam kev txawv txav nrog tus thickness ntawm lub npog. Kuj txawv.
