高速切削-ppt教学课件

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1、HSMOctober2005CuttingSpeedChipremovingForceCriticalFindingsCuttingVolumeSurfaceQualityToolLifeChipRemovingForce4,000rpm20,000rpm0.02.55.07.510.01.53.04.56.0CuttingdepthinmmRadialload(daN)GeneralFormulasRotaryspeedNVc*1000π*ømin-1CuttingspeedVcN*π*ø1000m/minFeedrateVfN*fz*namm/minInfeedpercuttinged

2、gefzVfnz*NmmRateofmetalremovingQae*ap*Vf1000cm3/minNmin-1Spindlespeedperminute/rotationperminuteVcm/minCuttingspeedVfmm/minFeedperminutefzmmFeedpercuttingedgenxNumberNumberofcuttingedgesaemmRadialfeedinmmapmmAxialfeedinmmphmmTooldiameterDeffmmEffectivetooldiameterQcm3/minRateofmetalremovingCharact

3、eristicofHSMIncreaseofthecuttingspeedIncreaseofcuttingzonetemperatureReductionoffrictioncoefficientbetweenthetoolandworkpieceIncreaseofreshapingresistanceProvokesadditionaltoolwearChangeinchipformationandchiprunHigherreshapingspeedIncreaseofchipbending,shearingangleandleadangleReductionofsurfacefr

4、ictionbetweenthetoolandchipReductionofthecuttingforcePositiveinfluenceonaccuracyandsurfacequalityThinwalledwork-piecesandslimmertoolscanbeused高速加工的主要特性提高切削速度切削区温度升高刀具与工件之间的磨擦系数降低改变切屑形状和形成过程切屑卷曲度增大，剪切角及前角增大刀具与切屑之间的磨擦系数降低减低加工载荷改善加工精度和质量改善加工表面光洁度HSMStrategyCriticalElementsofHSMTool/HolderMachiningTec

5、hniquesMachineCommunicationsToolpathGenerationCAMSystemMachineDesignControlTechnology12345678910111.00.90.80.70.60.50.40.30.20.1Length/DiameterLength/DiametercoefficientC3Strategy#1：ShallowCutting0.050.100.15304045505560HardnessinHRCMaterialhardnesscoefficientC2Depth＝rxC2xC3Strategy#2:Z-l

6、evelCuttingFlatendmillZ-levelcuttingCut-speed<0.05xdiameter,andnotmorethan0.2mmEndmillwithcornerradiusRampangle<3ºCut-speed<0.05xeffectivediameter,andnotmorethan0.2mmBallnoseendmillRampangle<5ºCut-speed<0.08xdiameterStrategy#2:Z-levelCutting平底刀等高加工径向进级速度<0.05x直径，不大於0.2mm平底圆角刀轴向进级不大於3度径向进级<0.05x有效直

7、径，不大於0.2mm球头刀轴向进级不大於5度径向进级<0.08x直径Strategy#3:SmoothTool-path避免经常改变加工方向转向处加上圆角用圆弧和Nurbs插值减低数据量尽量减少多轴同动Strategy#3:SmoothTool-path避免经常改变加工方向转向处加上圆角用圆弧和Nurbs插值减低数据量尽量减少多轴同动Strategy#4:Constantcutload恒定的残留峰谷高度值避免经常改变刀具