軋輥超聲波應力測量技術研究.pdf

1、上海交通大學博士后學位論文軋輥超聲波應力測量技術研究姓名：華云松申請學位級別：博士后專業(yè)：材料加工工程指導教師：崔振山孫大樂20060601上海交通大學博士后研究工作報告AbstractTherollsisnotonlytheimportantrollingtoolbutalsooneofthemostmajorconsumablesparepartsintherollingproduction，andtheworkingcharact

2、eristicsinfluencethesafety，efficiencyandcostofproductionandqualityofproductdirectlyTheasymmetricdistributionoftheresidualstressintherollerisoneofthefactorsinducedprematurelyfailuresThereforeitisveryimportantforguidingthe

3、rollerusagetomeasurethedistributionoftheresidualstressnondestructivelyandquantitativelyInthispapercomparedandanalyzedwiththeexistingresidualstressmeasuringtechniques，anultrasonicstressmeasuringtechnologybasedonthecritica

4、lrefractedlongitudinal(LCR)waveisputforwardandusedtomeasurethestressofthefieldrollerThemechanismofproductionandcharacteristicsofthistechniquewasstudiedtheoreticallyThenthefundamentalofthistechniquewasstudiedsystematicall

5、yandtherelationshipamongthevariationofstress，thestressconstantandthevariationofultrasonictraveltimeWasdeducedFactorsinfluencedultrasonicstressmeasurementaccuracywereanalyzed，mainlyincludingmaterialtexture，materialorganiz

6、ation，temperature，surfacestateofworkpiece，couplantandplaceofcouplingAnultrasonicstressmeasuringsystembasedontheLCRwave，whichadoptthemodeof“onesendingandtworeceiving”，wassetuptomeasureandanalyzetheresidualstressoftherolle

7、rsurfaceThecorrespondingsoftwarewasdevelopedtocalibratestressconstantsandtoanalyzeandcontrastmeasuringresultsontheresidualstressoftherollersurfaceAsetofarrangementcalibratingultrasonicstressconstantsusedtocalibratethestr

8、essconstantsofrollerswithdifferentmaterialsWasdevelopedThestressconstantoftwokindsofmaterial，spheroidalgraphiteironandsteel5％CrwastestedrespectivelyThevelocityoftheLCRwavetravelingineachmaterialhadalinearrelationshipcorr

9、espondtothestressButthestressconstantsofdifferentmaterialpresentsomedifferencesThestressofcircularflatplate5％Crspheroidalgraphiteironandcalibratingplate5％Cr’wastestedwiththeultrasonicstressmeasurementmethodandothertwomat