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262Vol.26,No.220064JournalofLiaoningInstituteofTechnologyApr.20062005196212111210012121001TH161A1005-1090(2006)02-0102-02DeterminationofShapeandPositionToleranceinDesigningMechanicalProductsHEBingSUNLuCAOBi-fen1.MechanicalEngineering&AutomationCollege,LiaoningInstituteofTechnology,Jinzhou121001;China;2.JinzhouElectricFurnaceCo.Ltd,Jinzhou121001,ChinaKeywords:mechanicalparts;functionalrequirement;shapeandpositiontoleranceAbstract:Itisextremelyimportanttoselectanddetermineshapeandpositiontolerancesinthedesignofmechanicalpartscorrectly.Thecriteriafordeterminationofshapeandpositiontoleranceswasintroduced,onthebasisoffunctionalrequirementsofmechanicalpartssyntheticeffectsofitsusage,technologyandeconomicresults.Thechoiceoftoleranceitems,standardandvalueswasanalyzedindetail.Thefunctionalcharacteristicsofmechanicalpartsarethefoundationtoselectthetoleranceitems,standardandvalues.Therelationsbetweenthemcanbeusedasthebasistodeterminethem,atthesametime,economicefficiencyandconveniencetomeasurewerealsoconsidered.11.1210312312120-0052019.948-200.026231.312233.1121-1213521350(;,1)Fta≤0e(1)tknktkaGa-+=-≤++∑1e(2)tntnaGa-++++22nntaa++⋅++-(0t≥)2(1)nta≥--,:0(;,1)Fta≤0e(1)tknktkaGa-+=-≤++∑12e(2)tntnaGa-++⋅++(9)(;,1)Fta0e(1)tkktkaGa-+∞==++∑,,0e(1)tkktkaGa-+∞=++∑=0e()(1)()tkktkaaaaGa-+∞=++∑L=0e()()(1)tkktkaGaaaa-+∞=++∑L:(;,1)Fta=1e......()(1)()(1)tktttkaaaGaaaaaaa-++⎡⎤++++⎢⎥+++⎣⎦L(10)(10)(;,1)Fta,2010-,(;2.6,1)Ftt=2.60.58249187371275;Simpson(2.6;2.6,1)F0.58249187375839(1010-).,(10)[1].[M].:,2001437.[2].[M].:,198372.1031281034()3.21IT5IT180.250.621/41/5[1][M].,2005.[2][M].,2004.[3][J].,2004,33(2):68-69.