航空框类整体结构件铣削加工变形的数值模拟与实验研究

《航空框类整体结构件铣削加工变形的数值模拟与实验研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、浙江大学机械与能源工程学院博士学位论文航空框类整体结构件铣削加工变形的数值模拟与实验研究姓名：吴红兵申请学位级别：博士专业：机械制造及其自动化指导教师：柯映林;刘刚20080401浙江大学博士学位论文关键词：航空整体结构件；有限元模拟；薄壁件；切削载荷；热力耦合；加工变形预测；框；斜角切削；接力计算；铝合金；本论文研究得到了国家自然科学基金重点项目及国家863高技术研究发展计划资助项目摘要ABSTRACTThemachiningdistortionofmonolithiccomponentsisoneofthemoststrikingproblemsinaviationmanufac

2、turingindustry．Ithasimportantvaluetoinvestigatetheeffectfactorsofmachiningdistortionandmethodsforreducingoravoidingdistortion．Basedonthedomesticandforeigninvestigatedstatus，fromthethreedimensionalcuttingprinciples，thedistortionofthin-walledpart，andthekeymodelingtechniquesofmonolithiccomponentsf

3、orthesimulation，amethodcombiningtheoreticalanalysiswithfiniteelementcalculationandexperimentisadoptedinthisdissertationtostudythedistortionprediction．Thecuttingmechanismhasbeendeeplyinvestigated．Usingthethreedimensionalobliquecuttingmodel，themachinedsurfaceresidualstressofaluminiumalloy7050T745

4、1hasbeensimulated．Thet001finiteelementmodelwithhelicaledgehasbeenusedtosimulatethemillingprocessofaluminiumalloy7050T7451，andthephysicalvalueincludingcuttingforceandcuttingtemperaturehasbeenanalyzed．Basedonthetheoryofcuttingdeformationofthin—walledparts，thekeytechniquesofcuttingsimulationofthin

5、．walledhasbeenstudied．Thethreedimensionalfiniteelementmodelofmillingprocessforthinned-wallparthasbeenestablished．Thepartdeflectionofthinnedwallparthasbeensimulatedusingtheestablishedmodel．Thecuttingstress，strain，andpartdeflectionhavebeeninvestigatedfurther．Whichprovidedtheconditionsfortheinvest

6、igationandcontroloflocaldeformation．Thekeymodelingtechniquesofthemachiningdistortionsimulationforthemillingprocessofmonolithiccomponentshavebeeninvestigated，whichincludethesimplificationofgeometricalmodel，simplificationoftechnics，theoriginalresidualstressofrawmaterial，simplificationofcuttinglay

7、erandtheapplicationandacquirementofcuttingloads．Therestartanalysismethodhasbeenadoptedtosimulatethemillingprocessofmonolithiccomponents．Theseprovidetheconditionsforthemachiningdistortionsimulationofmonolithiccomponents．Aimingatthe