ISO-2768-2几何公差

INTERNATIONALSTANDARDGeneraltolerancesPart2:ISO2768-2Firstedition1989-11-15GeometricaltolerancesforfeatureswithoutindividualtoleranceindicationsToterancesgenera/es-Partie2:ToterancesgeometriquespouretementsnonaffectesdetoterancesindividuellesReferencenumberISO2768-2:1989(E)B55EB1B3C7662F79D1B59483A53B9F2F82C98BEEB79392886FC261AAD8B630B625D84A2690B31ACBC4F537EC056FCBB2F26ED5AE49A72A0CE57976E3779D3C896379E8EB087C4AF04A270A0B0487Normen-Download-Beuth-AndritzAG-KdNr.144972-LfNr.8185296001-2017-11-2208:59ISO2768-2:1989{E)ForewardISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Each·memberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,govern­mentalandnon-governmental,inIiaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.DraftInternationalStandardsadoptedbythetechnicalcommitteesarecirculatedtothememberbodiesforapprovalbeforetheiracceptanceasInternationalStandardsbytheISOCouncil.TheyareapprovedinaccordancewithISOproceduresrequiringatleast75%approvalbythememberbodiesvoting.InternationalStandardISO2768-2waspreparedbyTechnicalCommitteeISO/TC3,Limitsandfits.ThisfirsteditionofISO2768-2,tagetherwithISO2768-1:1989,cancelandreplaceISO2768:1973.ISO2768consistsofthefollowingparts,underthegeneraltitleGeneraltolerances:Part1:TolerancesforlinearandangulardimensionswithoutindividualtoleranceindicationsPart2:Geometricaltolerancesforfeatureswithoutindividualtoleranceindi­cationsAnnexesAandBofthispartofISO2768areforinformationonly.©ISO1989Allrightsreserved.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromthepublisher.InternationalOrganizationforStandardizationGasepostale56•CH-1211Geneve20•SwitzerlandPrintedinSwitzerlandiiB55EB1B3C7662F79D1B59483A53B9F2F82C98BEEB79392886FC261AAD8B630B625D84A2690B31ACBC4F537EC056FCBB2F26ED5AE49A72A0CE57976E3779D3C896379E8EB087C4AF04A270A0B0487Normen-Download-Beuth-AndritzAG-KdNr.144972-LfNr.8185296001-2017-11-2208:59ISO2768-2:1989(E)lntroductionAllfeaturesoncomponentpartsalwayshaveasizeandageometricalshape.Forthedeviationofsizeandforthedeviationsofthegeometricalcharacteristics(form,orientationandlocation)thefunctionofthepartrequireslimitationswhich,whenexceeded,impairthisfunction.Thetolerancingonthedrawingshouldbecompletetoensurethattheelementsofsizeandgeometryofallfeaturesarecontrolled,i.e.nothingshallbeimpliedorlefttojudge­mentintheworkshoporintheinspectiondepartment.Theuseofgeneraltolerancesforsizeandgeometrysimplifiesthetaskofensuringthatthisprerequisiteismet.iiiB55EB1B3C7662F79D1B59483A53B9F2F82C98BEEB79392886FC261AAD8B630B625D84A2690B31ACBC4F537EC056FCBB2F26ED5AE49A72A0CE57976E3779D3C896379E8EB087C4AF04A270A0B0487Normen-Download-Beuth-AndritzAG-KdNr.144972-LfNr.8185296001-2017-11-2208:59B55EB1B3C7662F79D1B59483A53B9F2F82C98BEEB79392886FC261AAD8B630B625D84A2690B31ACBC4F537EC056FCBB2F26ED5AE49A72A0CE57976E3779D3C896379E8EB087C4AF04A270A0B0487Normen-Download-Beuth-AndritzAG-KdNr.144972-LfNr.8185296001-2017-11-2208:59INTERNATIONALSTANDARDISO2768-2:1989(E)Generaltolerances-Part2:Geometricaltolerancesforfeatureswithoutindividualtoleranceindications1ScopeThispartofISO2768isintendedtosimplifydrawingindica­tionsandspecifiesgeneralgeometricaltolerancestocontrolthosefeaturesonthedrawingwhichhavenorespectivein­dividualindication.ltspecifiesgeneralgeometricaltolerancesinthreetoleranceclasses.ThispartofISO2768mainlyappliestofeatureswhicharepro­ducedbyremovalofmaterial.ltsapplicationtofeaturesmanufacturedbyotherprocessesispossible;however,specialexaminationisrequiredtoascertainwhetherthecustomaryworkshopaccuracylieswithinthegeneralgeometricaltoler­ancesspecifiedinthispartofISO2768.2GeneralWhenselectingthetoleranceclass,therespectivecustomaryworkshopaccuracyhastobetakenintoconsideration.lfsmallergeometricaltolerancesarerequiredor!argergeometricaltolerancesarepermissibleandmoreeconomicalforanyindividualfeature,suchtolerancesshouldbeindicateddirectlyinaccordancewithISO1101(seeclauseA.2).GeneralgeometricaltolerancesinaccordancewiththispartofISO2768applywhendrawingsorassociatedspecificationsrefertothispartofISO2768inaccordancewithclause6.Theyapplytofeatureswhichdonothaverespectiveindividualgeometricaltoleranceindications.Generalgeometricaltolerancesapplytoallgeometricaltoler­ancecharacteristics,excludingcylindricity,profileofanyline,profileofanysurface,angularity,coaxiality,positionaltoler­ancesandtotalrun-out.lnanyevent,generalgeometricaltolerancesinaccordancewiththispartofISO2768shouldbeusedwhenthefundamentaltolerancingprincipleinaccordancewithISO8015isusedandindicatedonthedrawing(seeclauseB.1).3NormativereferencesThefollowingstandardscontainprovisionswhich,thr