iso 19973 3 2015 ishared

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ReferencenumberISO19973-3:2015(E)

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ISO19973-3:2015(E)

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ISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsis normallycarriedoutthrough ISO technical committees. Each member body interested in a subject for which a technicalcommittee has been established has the right to be represented on that committee. Internationalorganizations, governmental and non-governmental, in liaison with ISO, also take part in the work.ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters ofelectrotechnicalstandardization.

The procedures used to develop this document and those intended for its further maintenance aredescribedintheISO/IECDirectives,Part1.InparticularthedifferentapprovalcriterianeededforthedifferenttypesofISOdocumentsshouldbenoted.ThisdocumentwasdraftedinaccordancewiththeeditorialrulesoftheISO/IECDirectives,Part2(seewww.iso.org/directives).

For an explanation on the meaning of ISO speciϐic terms and expressions related to conformityassessment, as well as information about ISO’s adherence to the WTO principles in the TechnicalBarrierstoTrade(TBT)seethefollowingURL:Foreword-Supplementaryinformation

This second edition cancels and replaces the ϐirst edition (ISO 19973-3:2007), which has beentechnicallyrevised.

— Part1:Generalprocedures— Part2:Directionalcontrolvalves— Part3:Cylinderswithpistonrod— Part4:Pressureregulators

— Part5:Non-returnvalves,shuttlevalves,dualpressurevalves(ANDfunction),one-wayadjustableϔlowcontrolvalves,quick-exhaustvalves.

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Inpneumaticϐluidpowersystems,poweristransmittedandcontrolledthroughagasunderpressurewithinacircuit.Pneumaticϐluidpowersystemsarecomposedofcomponentsandareanintegralpartof various types of machines and equipment. Efϐicient and economical production requires highlyreliablemachinesandequipment.ThispartofISO19973isintendedtoproviderequirementsandtestconditionsthatpermittheassessmentoftheinherentreliabilityofpneumaticcylinderswithpistonrod.It is necessary that machine producers know the reliability of the components that make up theirmachine’spneumaticϐluidpowersystem.Knowingthereliabilitycharacteristicofthecomponent,theproducerscanmodelthesystemandmakedecisionsonserviceintervals,spareparts’inventoryandareasforfutureimprovements.

a) preliminarydesignanalysis: ϐiniteelementanalysis(FEA),failuremodeandeffectanalysis(FMEA);

b) laboratorytestingandreliabilitymodelling: tionevaluation;

Eachlevelhasits applicationduringthelifeofacomponent.Apreliminarydesignanalysisisusefulto identify possible failure modes and eliminate them or reduce their effect on reliability. Whenprototypes are available, in-house laboratory reliability tests are run and initial reliability can bedetermined.Reliabilitytestingisoftencontinuedintotheinitialproductionrunand throughouttheproductionlifetimeasacontinuingevaluationofthecomponent.Collectionofϐielddataarepossiblewhenproductsareoperatinganddataontheirfailuresareavailable.

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1 Scope

ThispartofISO19973providestestproceduresforassessingthereliabilityofpneumaticcylinderswithpistonrod,bothsingle-actinganddouble-acting,bytestingandthemethodsofreportingtheresultsoftesting.GeneraltestconditionsandthecalculationmethodareprovidedinISO19973-1.Themethodsspeciϐied in ISO 19973-1 apply to theϐirst failure, as obtained with the three-point moving average(3PMA)method,withoutrepairs,butexcludingoutliers.

This part of ISO 19973 also speciϐies test equipment and threshold levels for tests to assess thereliabilityofpneumaticcylinderswithpistonrods.

This part of ISO 19973 is intended to be applied to pneumatic piston rod cylinders that conform toISO6430,ISO6432,ISO15552,andISO21287;however,pneumaticpistonrod cylinders thatdonotconformtotheseInternationalStandardsbutareusedinthesamerangeofoperatingconditionscanbetestedinaccordancewithoneoftheclassesdeϐinedinTables1and2.

2 Normativereferences

Thefollowingdocuments,inwholeorinpart,arenormativelyreferencedinthisdocument andareindispensable for its application. For dated references, only the edition cited applies. For undatedreferences,thelatesteditionofthereferenceddocument(includinganyamendments)applies.

ISO1219-1, Fluidpower systemsandcomponents— Graphical symbolsand circuitdiagrams — Part 1:Graphicalsymbolsforconventionaluseanddata-processingapplications

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The basic circuits inFigure 1 do not incorporate all thesafety devices necessary to protect againstdamageintheeventofcomponentfailure.Itisimportantthatthoseresponsibleforcarryingoutthetestgivedueconsiderationtosafeguardingbothpersonnelandequipment.

5.2 Cylinderstobetestedshallberigidlyinstalledinthehorizontalpositionandϐixedtoasecurebasetoreducevibration.Theyshallbeϐixedatbothends.Ifnecessary,alternatethemotionofthecylinderstoallowonetoextendwhileanotherretracts.

6 Testconditions

6.1 Generaltestconditions

AlltestunitsshallhavepassedanacceptancetestconductedinaccordancewithISO10099.ThegeneraltestconditionsshallbeinaccordancewithISO19973-1.

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6.3.2.1 Nosideloadsshallbeappliedtosingle-actingcylinders.Testresultscanberelatedonlytothetestedstroke.

6.3.2.2 Fordouble-actingcylinders,thesideloadshallbemountedasfollows.

a) The side load shall be tightened against the shoulder of the piston rod close to the theoreticalreferencepoint(TRP)[seeISO6099andFigure2a)].Thismountingtypeshouldbepreferred.b) The side load masses and the distances from the TRP for double-acting cylinders shall be in

c) Whenacounternutisrequired,thesideloadshallbemountedwithaclearanceLNfromtheTRP[seeFigure2b)].However,thedistanceLTshallbemaintainedasshowninTable1.

d) ThesideloadshallbemountedtoengagethepistonrodatadistanceHbelowthecentreofgravity(CG).ValuesforHaregiveninTable1.

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ISO15552)8

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6.3.4 Testoperatingtime

1 2

1 4

Asaguidelineanaveragestrokevelocity,V<small>m</small>,of500mm/s±50%is recommended forallcylinders.Cylinderswithoutaircushioningarerecommendedforoperationinthelowervelocityrange.

Themaximumtestfrequency ¹t_TCT

^{shallbedeterminedinawaythattherequirementsofISO19973-1,}8.4arefulϐilled.

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6.4 Operatingadjustments

6.4.1 Ensurethattheinstallationscrewsremaintightduringthetest.

6.4.2 Operatethetestcylinderssothatthestroketimedoesnotexceedthespeciϐicationsin6.3.4atthestartofcycling.Thestroketimeshallincludetheeffectsofanyadjustablecushioningdeviceusedtopreventimpactattheendofthestroke.Setthestroketimetothevaluesgivenin6.3.4.

6.4.3 Ascyclingcontinues,itispermissibleforthestroketimetoincreaseuntilthecylinderreachesitsendposition.

6.4.4 Adjustthecushioningdeviceandtheadjustableϐlowcontrolvalvestoallowthecylindertoreachtheendposition.

6.4.5 Whentheoperatingadjustmentsallowedinthissub-clausenolongerallowatestunittoreachtheendposition,operationofthattestunitshallbestopped.

7 Testprocedures

7.1 Timingofchecksandmeasurements

7.1.1 Thefollowingchecksandmeasurementsshallbemadebefore,duringandaftertheendurancetest:a) functionalcheckinaccordancewith7.2.1;

b) measurementoftheleakageinaccordancewith7.2.2;

c) measurementoftheminimumworkingpressureinaccordancewith7.2.3;d) measurementoftheteststroketimeinaccordancewith7.2.4.

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7.2.4 Stroketimetest

Thetestunitsshallreachthestrokeendpositionsineachdirectionwithinonehalfofthecycletime.Recordifthecylinderhasreacheditsendpositionwhenthedirectionalcontrolvalveisoperated.If a cylinder type does not reacheither end position within one half of thetestcycle time speciϐiedbecauseofitsspecialdesignfeatures(oriϐices,friction,etc.),thedeviatingtestconditionsshallbenotedinthetestreportand,ifnecessary,inthecataloguedataofthecylindertype.

8 Failurecriteriaandthresholdlevels

8.1 General

140320

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8.5 Failureduetoexceedingthemaximumteststroketime

8.6 Customisedagreements

Individual customers and industry segments can have requirements that do not conform to therequirements ofthispartof ISO 19973. Customized agreements onany deviations fromthis partofISO19973shallbeagreedbetweenthecylindermanufactureranditscustomerandshallbedocumentedintestreportsandincataloguedata.

9 Dataanalysis

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11 Identiϐicationstatement(referencetothispartofISO19973)

“Reliability and lifetime of pneumatic piston rod cylinders assessed in accordance with ISO 19973-3,Pneumaticϔluidpower—Assessmentofcomponentreliabilitybytesting—Part3:Cylinderswithpistonrod.”

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A.1 General

TestlaboratoriesandcylindermanufacturersmightwanttoteststrokesotherthanthosespeciϐiedinthispartofISO19973.ThisAnnexassiststhembyprovidingmethodstocalculatesideloadmasses,relateddimensionsandsideloadlocations.

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 ^ =



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 ^ =

⋅ ^ ⋅

2

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FigureA.2—BasicdimensionsofcylindersconformingtoISO6432discussedinthisAnnexA.3.3.2 Calculationofthemoment

 ^ =

^ ^ ⋅2

 ^ ⋅^{9 81}1000

M[N·m]

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9 81

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— Forsquare-shapedsideloads:m_S =w LM<small>2</small>⋅ ⋅ ⋅ ⁻<small>6</small>

A.4.3 Itisrecommendedthatsideloadsbemadefromsteelorbrass,withthefollowingdensities:

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— forsteel,ρ=7,85kg/dm<small>3</small>— forbrass,ρ=8,50kg/dm<small>3</small>

A.5 Exampleofcalculations

A.5.1 Exampleparameters

A double-acting cylinder conformingto ISO 15552 with a pistondiameter of 32mm andastroke of250mmistestedinaccordancewiththispartofISO19973.Thesideloadismadefromsteelwithasquareshape.Spaceforacounternutistakenintoconsideration.SeeTableA.5forasummaryofthevaluesofallparameters.

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AdatasheetforrecordingdatafromtestsconductedinaccordancewiththispartofISO19973isgivenonthenexttwopages.

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ISO19973-3:2015(E)

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[1] ISO6430,Pneumaticϔluidpower—Singlerodcylinders,1000kPa(10bar)series,withintegralmountings,boresfrom32mmto250mm—Mountingdimensions

[2] ISO6432,Pneumaticϔluidpower—Singlerodcylinders—10bar(1000kPa)series—Boresfrom8to25mm—Mountingdimensions

[3] ISO 15552, Pneumatic ϔluid power — Cylinders with detachable mountings, 1 000 kPa (10 bar)series,boresfrom32mmto320mm—Basic,mountingandaccessoriesdimensions

[4] ISO21287,Pneumaticϔluidpower—Cylinders—Compactcylinders,1000kPa(10bar)series,boresfrom20mmto100mm

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ICS౧23.100.01<small>Pricebasedon21pages</small>

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