Interchangeability知识资料and知识资料technique知识资料measurement

朽木易折，金石可镂。千里之行，始于足下。第页/共页InterchangeabilityandtechniquemeasurementThiscoursefocusoninterchangeabilityofworkpiecesanditsmanufacturetolerancesinrageofdimensions.Interchangeability'sdefinitionisintheindustriesmanufacture,ifsomepartsofmachinewerebrokenordestroyed,thepickuppartsinsteadofbrokenoneswhichareunnecessarytochooseorrepairorfixcansuitableassembleonmachine,andcansuitrequirementsofmachine.Tolerances:allowanceofvariationquantityofparts'dimensionandgeometricparameter.Parts'interchangeabilityingeometricparametercalledStandardofTolerances.Kindsofinterchangeability:completelyinterchangeabilityandsemi-completelyinterchangeabilitySize:DimensionHoleandshaftBasicdimensionActualdimensionLimitdimensionMMCandMMSLMCandLMSES,es=Maxlimitdimension-basicdimensionEI,ei=MinLimitdimension-BasicdimensionT=Maxlimitdimension-MinlimitdimensionZeroline:lineofbasicdimensionRangeoftolerance:MAX-MINNationalstandardforrangeoftolerance:1.Wideoftolerance(sizeoftolerance);2.Basicdeviation(locationoftolerance)

X=clearance,dimensionofhole-dimensionofshaft=positiveY=interference,dimensionofhole-dimensionofshaft=negativeKindofcombing:clearancecombing(atoh),interferencecombing(ptoz),transitioncombing(js,k,m,n)IT=ISOTolerance,20gradesCombing:basicholesystemclearancecombing(forbasicholesystem,Hisbehindc)transitioncombinginterferencecombingToleranceofshapeandlocationShape：Straightness直线度2.Flatness平面度3.Roundness圆度4.Cylindricity圆柱度5.Lineprofile线轮廓度6.Surfaceprofile面轮廓度Location:Parallelism平行度2.Verticality垂直度3.Inclination倾斜度4.Coaxiality同轴度5.Symmetry对称度6.Positiondegree位置度7.Circlerunout圆跳跃8.Totalrunout全跳跃Surfaceroughness:Ra=contourcalculateaveragedeviationRz=tenpointaverageofmacroDimensionchainCharacteristics:1.Sealing2.ConditionalityCalculati