先进制造技术--施平五单元.ppt

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1、AdvancedManufacturingTechnology先进制造技术施平Part51Contents1.IntroductiontoAMT2.Computerandcommunication3.Computer-aidedengineering4.Automation5.Modernmanufacturingtechnologies25.ModernmanufacturingtechnologiesBasictheoryandmoderntechnologyTechnologicalchangeinmanufacturingengineeringisphenomenalandsp

2、eedingBasictheories(likemetalcuttingtheory)arethefoundationofthesophisticatedtechnologies35.ModernmanufacturingtechnologiesPrecisionengineeringQualityimprovementsofproductsrequirestheenhancementofprecisionofproductionsystem5.1Modernmanufacturingtechnologies-Precisionengineering45.Modernmanufactu

3、ringtechnologiesBasicdefinitionsAccuracyAquantitativemeasureofthedegreeofconformancetorecognizednationalorinternationalstandardsofmeasurementRepeatabilityAmeasureoftheabilityofamachinetopositionatoolsequentiallywithrespecttoworkpieceundersimilarconditionsResolutionTheleastincrementofameasuringde

4、viceTheleastsignificantbitonadigitalmachine5.1Modernmanufacturingtechnologies-Precisionengineering55.ModernmanufacturingtechnologiesMotionSlideSpindleRigidelementWetreatindividualelementasrigidbodyFlexiblestructureThewholestructuremaybeflexibleduetodeflectionsandjoints5.2Modernmanufacturingtechn

5、ologies-Precisionengineering65.ModernmanufacturingtechnologiesRigidbodymotionanderrorTheslide5constraints(Y,ZmovementalongY,Z,rotationaboutX,Y,Z)1DOF(movementalongX)WecontrolX,whiletreatingtheother5DOFsaserrors5.2Modernmanufacturingtechnologies-Precisionengineering75.Modernmanufacturingtechnolog

6、iesCategoriesofsourcesoferrorsofamachinetoolGeometricerrorsCausedbylackofstraightnessinslide-ways,staticdeflectionofmachinetool,angularerrorsDynamicerrorsCausedbymachinetoolvibration(chatter)Inherentfrequency(avoidthe1st,2nd,…)andresonanceStiff,lightweight,well-dampedmachinetoolhaslessdynamicerr

7、orWork-pieceeffectsMachinetooldeflectioncausedbyfixingandcuttingforcesduringcuttingprocessInertialeffectsduetomotion:over-shootonalinearmotion;periodicdeviationscausedbydynamicunbalanceduetopartasymmetryaboutrotationalaxis(l