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ID:36604728
大小:6.24 MB
页数:106页
时间:2019-05-12
《非圆回转曲面车削加工中的新型高精度快速刀具微进给系统的研究》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、上海交通大学博士学位论文非圆回转曲面车削加工中的新型高精度快速刀具微进给系统的研究姓名:马浩全申请学位级别:博士专业:机械制造及其自动化指导教师:胡德金20040901AbstractWiththewiderandwiderapplicationOfthenon·circularpartsinindustry,andtheirprofilesarebecomingmoreandmorecomplicated,therefore,itisveryimportanttodevelopkeytechniques,whicharepreciseandproficient,toachieve
2、theturningoftheseparts.Pistons,whicharewidelyusedinindustry,arekeypartsofmotors。Inordertomeettherequirementsofmotors,SOtheshapesofpistonsarebecomingmorecomplex.Nowadays,peoplefocusonkeytechniques,thatFastToolSystemisoneofthem,ofturningpistonswiththedevelopmentofCNCmethod.Anewpiezo-drivensystem
3、,intowhichflexure-hingeamplifyingstructureisalsointroduced,isputforwardinthisthesistoachievetoolsfeeding.AccordingtothebasictechnicalconditionsofturningpistonswithCNCmethodandthecharacteristicsofpiezoelectricandPZTactuatorareatsoconsidered?awholeoutlineofFTS,whichiSdrivenbyPZTactuator,iSputfor
4、ward.Thecont.entofthisthesisare氇8following.Thededuction.inwhichvariationprincipleandpiezoelectricconstitutionequationareused.offiniteequationsofpiezoelectricceramicsiSbrieflyintroduced,andalsofiniteanMysisandexperimentsofPZTactuator,whichiSused{11theFTS,aremade。Inordertogetlargeroutputdisplace
5、mentofFTS,alleWamplifyingstructure,whichisbasedonflexurehinge。iSputforwardi11thisthesis.First,thecalculationsanddesignaremadefromtheperspectiveofstaticsanddynamics,then,topologyop-timizationsaremadetoimprovethefirst—ordermodalfrequencyandanewstructure,whichisfeasibletobemanufactured,isredesign
6、edontheresultoftopologyoptimiza-tions,last,bothmodalandfatigueanalysisaremadebyfinitemethod,andalsotheexperimentsaredonetoprovethedesignprocessiseffective.Toachievethereal-timecontrolofFTS.alinearmathematicmodelofFTSiSpresented.andthecombinationofbothrepetitiveCOntrolandPIcontrolareintroducedi
7、ntothesystemagainsttheperiodiccharacteristicofnon—circularturning,asaresult,thetracingaccuracyofperiodicsignalisincreasedandafeed-forwardcontrolisusedtodecreasetheeffectofcuttingforce.BecausethesensoreffectofPZT,piezoelectricvoltagefeed
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