OverviewInmanyoftoday’smanufacturingenterprises,theCMMhassupplantedtraditionalhardgagingsystems.当今诸多制造企业中，CMM已经或正在取代传统测量工具。Processcontrolandqualityassurancein modernmanufacturingoperationsdependincreasinglyupontheperformanceofcoordinatemeasuringmachines(CMMs).Over thepast25years,CMMshavereplacedtraditionalmethodsofinspectionthatemployedgagesandfixtures,andhavereducedthetimeandmanpow errequiredforquality-controloperations.现代生产中的过程控制和质量管理正越来越依靠 CMM的性能。在过去的25年里，CMM替代了传统的人工检测方法，大幅减少了人力，缩短了时间。CMMsallowyoutoinspectstandardgeometricaldimensions,asw ellaspartsw ithspecialfeaturessuchasgears,camshafts,andairfoilshapes.Inatraditionalmanufacturingenvironment,eachofthesespecialinspectionsw ouldrequireasingle-purposetestingmachine.CMM不但可以检测标准的几何尺寸，同时也可以做特征部件的测量，比如齿轮，凸轮轴，飞机螺旋桨等。在传统的生产环境中，每种特殊的检测需要专用的测量设备。Productqualitydoesn’tdependonlyonthequalityofthemachinetoolsusedformanufacturing;italsodependsontheaccuracyandrepeatabilityofmeasuringandinspectiondevices.Alow -cost,low -performancemachiningcenterusedincombinationw ithahigh-precisionCMMcanstillguaranteeproductquality,becauseonlypartsw ithintolerancecanpasstheCMM’sinspection.Conversely,anexpensive,high-qualitymachiningcenteroperatedincombinationw ithalow -cost,low -accuracymeasuringdevicecannotguaranteequalityproducts.Acertainpercentageofout-of-tolerancepartsw illalw ayspassthelow -accuracyCMM’sinspection,andlikew ise,acertainpercentageofpartsw ithinthetolerancerangew illberejected.Consequently,selectingtherightCMMiscritical.产品的质量不仅由生产设备的精度来保护，而且依赖检测设备的精度和可重复性。一个低成本和精度的加工中心如果有高精度的 CMM来检测产品，同样可以保证产品的质量。相反，一台昂贵高端的加工中心，如果只有低精度的 CMM来检测产品，是不是确保产品的品质的。有时，某些已超差的部件却通过了低精度 CMM的检查，公差内合格的部件却通过不了检测。所以，选择正...
