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1、LASERULTRASONICSENSORFORON-LINESEAMLESSSTEELTUBINGPROCESSCONTROL1223334G.Jeskey,R.KolarikII,E.Damm,J.-P.Monchalin,G.Lamouche,S.E.Kruger,andM.Choquet123JeskeyConsulting,NorthCanton,Ohio,USA;TheTimkenCompany,Canton,Ohio,USA;IndustrialMaterials4Institute,Boucherville,Quebec,Canada;Tecn
2、arAutomationLtd.,St.Bruno,Quebec,Canada.Abstract:Numerousmechanicalcomponentssuchasbearingsandgearsaremanufacturedfromseamlesssteeltubing,whichofferssuperiormechanicalproperties.Thetubemakingprocessoftentimescauseswallthicknessvariationsinahelicalpatternalongthetubelength.Therefore,
3、additionalclean-upstockisaddedtothetube.Processcontroltoreducethisvariationwouldachieveconsiderablesavingsthroughimprovedmaterialutilizationandreducedtubingscrapandre-work.Forcomponentsmachinedfromtubing,additionalsavingsarerealizedfromreducedmachiningtimeandtoolwear.Alaser-ultrason
4、icsystemwasinstalledimmediatelyafterthefinaloperationinseamlesstubemaking.Thesystemconsistsofgenerationanddetectionlasersandaninterferometerlocatedinacabinoutsidethetubemill,andafibercoupledinspectionheadlocatedabovetheprocessline.Tubewallthicknessandtemperaturemeasurementsareusedto
5、guidemilladjustmentstoachievethedesiredtolerances.Nearly1,000,000tubeswereinspectedinthefirsttwoyearsofoperation.Inaseparateeffort,additionalfunctionalitywasaddedusingthesamesignalsthatmeasurethetubewallthicknesstosensethesizeoftheausteniticgrains.Theausteniticgrainsizeofcarbonandal
6、loysteelisofhighimportanceduetotheimpactonmechanicalpropertiesofthefinalproduct.Thetimedelaybetweenthebackwallreflectionsisafunctionofthewallthickness,whiletheattenuationbetweenthesesamesignalsisrelatedtothegrainsize.Thetargetausteniticgrainsizeisachievedbycontrollingthedeformationa
7、ndthermalprocessparametersoperationinseamlesstubemaking.Introduction:Seamlesstubesareusedfornumerousapplications,suchashydrauliccylindersandpowertransmissioncomponents(gearsandbearingraces)wheremicrostructuralvariationduetoaweldseamisnotacceptable.Thetubemakingprocessbeginswithheate
8、dcylindricalbillets
