发布时间 : 星期四 文章机械制造技术基础英文课件CHAPTER6 - 图文更新完毕开始阅读7f9eb77931b765ce0508148a
3 About the area below the curve
Thetotalareabelowthecurverepresentsthatalltheworkpiecesfallwithinthedistributionrange.InFig.6.27,pointCrepresentstheminimumdimensionAmin,zoneCDrepresentsthetolerancerange，theareabelowpointCandDrepresentsthequalifiedpartsratio,andtheareaoftheleftpartbelowthecurve(nohatchedpart)istherejectedratio.Whenthedimensionisthediameterofanexternalcylindricalpart,theleftnon-hatchedpartcannotberepaired,therighthatchedpartcanberepaired.Itisexactlycontrarywiththeholemachining.TheareafromαtoXcanbecalculatedwiththefollowingformulaforanormaldistribution
1A??YdX???2?x?e?(X??)22?2dX