曲面數(shù)控加工中的擬合、光順及干涉問題研究.pdf

1、華中理工大學(xué)博士學(xué)位論文曲面數(shù)控加工中的擬合、光順及干涉問題研究姓名：彭芳瑜申請學(xué)位級別：博士專業(yè)：機械設(shè)計及理論指導(dǎo)教師：周濟周云飛2000.5.1華中理工大學(xué)博士學(xué)位論文ABSTRACTThesurfacesmachiningisallimportantapplicationofNCprogrammingsystem，andwidelyusedinmanufacturingdies，molds，turbineblades，marin

2、epropellers，andaerospacepartsInthesituationofourcountrytheconventionalprojectblueprinthasbeenamajortransferringtoolforalongtime，andthemodelwillplayamoreandmoreimportantpartinaerodynamicssurfacesandmoldsHoweversomeproblem

3、shavebeenstillexistedinsurfacefitting，smoothingandinterferenceavoidingusingcurrentNCprogrammingsystemInthelightofsomequestionsfrompractice，thesurfacereconstructionwithhighqualitythecutterlocationgenerationwithoutgougehav

4、ebeenthoroughlyinvestigatedinthisdissertation(1)ThedateprovidedbyprojectblueprintormodelisalwaysirregularWhenusingquadrangleortrianglesurfacereconstructiondirectlythesmoothnessofthesurfacecouldnotbeguaranteedSoanewideafo

5、rsurfacereconstruction，whichcombinestheinterpolationwiththeapproximation，hasbeenpresented，andanalgorithmcomposedofinitialsurfaceinterpolation，surfaceapproximation，andsurfacesubdivisionhasbeenrealizedInpractice，thisideaan

6、dalgorithmhasgoodeffect(2)Fortheaerodynamicssurfaces，goodsmoothnessisusuallyrequiredinadditiontotheapproximateprecisionAnewideaabouttheintegralsmoothingofsurface，whichisbasedonthegeneralizedenergyminimizationtoavoidthesh

7、ortcomingoftheexistingalgorithms，hasbeenpresented，andthenseveralalgorithmshavebeenconstructedBecausethesmoothingcriterionsbothingeometryandinphysicshavebeenfullyconsideredinthisidea，thesmoothedcomplexsurfacewouldhavegood

8、quality(3)Afterinvestigatingtheshortcomingoftheexistingalgorithmsanewideawhichtheinterferencecheckingissimplifiedfromtrianglesinspacetopointsonasingleaxis，hasbeenpresented，andanalgorithmconsistedofinterferencechecking，in

9、terferenceavoiding，andundercutregionmachininghasbeenconstructedThisalgorithmnotonlyimprovestheefficiencyandstabilityoftheinterferencecheck，butalsomakesthemachiningoftheundercutregionsbecomeveryeasySothisalgorithmwouldhav

10、egoodpracticalityin3axisNCmachining。(4)SomeessentialassistantfunctionsareimportanttoolstoimprovetheefficiencyoftheNCprogrammingsystemAsetofanalysistoolsforsurfacecharacteristicandasimulationfunctiondisplayingwithrealgrap