sae j442-2013 test strip, holder, and gage for shot peening

1、__________________________________________________________________________________________________________________________________________SAETechnicalStardsBoardRulesprovidethat:“ThisreptispublishedbySAEtoadvancethestate

2、oftechnicalengineeringsciences.Theuseofthisreptisentirelyvoluntaryitsapplicabilitysuitabilityfanyparticularuseincludinganypatentinfringementarisingtherefromisthesoleresponsibilityoftheuser.”SAEreviewseachtechnicalreptatl

3、easteveryfiveyearsatwhichtimeitmayberevisedreaffirmedstabilizedcancelled.SAEinvitesyourwrittencommentssuggestions.Copyright?2013SAEInternationalAllrightsreserved.Nopartofthispublicationmaybereproducedstedinaretrievalsyst

4、emtransmittedinanyfmbyanymeanselectronicmechanicalphotocopyingrecdingotherwisewithoutthepriwrittenpermissionofSAE.TOPLACEADOCUMENTDER:Tel:8776067323(insideUSACanada)Tel:17247764970(outsideUSA)Fax:7247760790Email:SAEWEBAD

5、DRESS::www.sae.gSAEvaluesyourinput.ToprovidefeedbackonthisTechnicalReptpleasevisit:www.sae.gtechnicalstardsJ442_201302AEROSPACESURFACEVEHICLERECOMMENDEDPRACTICEJ442FEB2013Issued195201Revised201302SupersedingJ442NOV2008(R

6、)TestStripHolderGagefShotPeeningRATIONALEEntiredocumentrevisedrefmattedtoextractinfmationrelativetouseofthesearticlespassthemtoSAEJ443ProceduresfUsingStardShotPeeningAlmenStrip.1.SCOPEThisSAEstarddefinesrequirementsfequi

7、pmentsuppliestobeusedinmeasuringshotpeeningarcheightothersurfaceenhancementprocesses.GuidelinesfuseoftheseitemscanbefoundinSAEJ443SAEJ2597.2.REFERENCES2.1ApplicableDocuments2.1.1SAEPublicationsAvailablefromSAEInternation

8、al400CommonwealthDriveWarrendalePA150960001Tel:8776067323(insideUSACanada)7247764970(outsideUSA)www.sae.g.SAEJ403ChemicalCompositionsofSAECarbonSteelsSAEJ443ProceduresfUsingStardShotPeeningAlmenStripSAEJ2597ComputerGener

9、atedShotPeeningSaturationCurves2.1.2ASTMPublicationAvailablefromASTMInternational100BarrHarbDriveP.O.BoxC700WestConshohockenPA194282959Tel:6108329585www.astm.gASTME18StardTestMethodfRockwellHardnessRockwellSuperficialHar

10、dnessofMetallicMaterialsSAEJ442RevisedFEB2013Page2of53.EQUIPMENT3.1TestStrip3.1.1TheteststripisaflatrectangularpieceofSAE1070coldrolledsteelconfmingtothedeioninFigure1.Teststripsexistinthreestardthicknessesflowmediumhigh

11、intensityapplications.3.1.2Subsizestripsmaybeusedfintensitymeasurementsinsmalllocationssuchasholesslots.ThesestripsshallconfmtorequirementsofFigure1exceptflengthwidth.Therollingdirectionshallbealongthelengthoftheteststri

12、p.SeeSAEJ443fadditionalrequirements.3.2HolderAhardenedsteelholdingfixtureconfmingtotherequirementsofFigure2shallbeusedwhenexposingtheteststriptoashotstream.Flatnessinthecontactzone(crosshatchedareashowninFigure2.)shallbe

13、maintainedto0.1mm.(0.0039inch)3.3GageThegageshallconfmtotherequirementsshowninFigure3shallhaveacapabilityresolutionof0.001mm.Itshallhaveanaccuracyof0.005mm(0.0002inch).Itshallbecalibratedinitsrangeofoperationwhichis0.050

14、mmto0.600mm.Thegageshallbecalibratedonanannualbasis.Calibrationshallconsistofreptingatleast5pointsofextension(i.e.0.20.30.40.50.6mm)ftheindicatdevice.Ballsindicattipshallbeinspectedreplacedifthereareflatspotsgreaterthan1

15、.0mm.Positioningpostsshallbereplacedrotatedifgrooveswouldinterferewithproperseatingofthestripontothegage.3.4ZeroBlockAzeroblockwithacertifiedflatsurface(0.005mm)shallbeusedtosetthezerodatumofthegage.Theblockshallbeshaped

16、suchthatitrestsuponthesurfaceofthefoursupptballs.FIGURE1TESTSTRIP1.Material:SAE1070coldrolledspringsteelperSAEJ403.HeatTreatment:Allstripsshallbeunifmlyhardenedtemperedtoproducetemperedmartensitehavingahardnessasmeasured

17、onthesurfaceofHRC(4450)ftheACstripsHRA(72.576.0)fthe“N”strips.HardnessshallbemeasuredinaccdancewithASTME18atapproximately13mmfromeitherendofthestriponthelongitudinalcenterlineofaflatside.Samplingfhardnesstestingofthestri

18、psshallbeused.Hardnessdeterminationprecludesotheruseofthestrip.NACSAEJ442RevisedFEB2013Page3of5SurfaceCarbon:Stripsshallbefreefromalterationofsurfacecarbonleveltothedegreethatanydifferenceinaveragehardnessbetweenthesurfa

19、cesubsurfacematerialshallnotexceedtwopointsasmeasuredontheRockwell30Nscale.Theaverageofatleastfourreadingsineachshouldbeusedtomakethecomparison.Anysuchdeterminationmustbemadeonstripswhichhavenotbeenshotpeenedhardnessdete

20、rminationwillprecludeotheruseofthestrip.Surfacehardnessreadingsthatarelessthansubsurfacereadingsindicateevidenceofdecarburization.Surfacereadingswhicharehigherthanthecrespondingsubsurfacevaluesindicatecarburization.Fexam

21、ple:Iftheaveragesurfacehardnessin62.5ontheRockwell30Nscaleaftercarefulgrindingaregionbelowthesurfaceisfoundtobe64.0ontheRockwell30Nscale–thestripisacceptable.Ifthesubsurfacereadinghadbeen65.0ontheRockwell30Nscalethediffe

22、rence(2.5points)beingovertwopointswouldconstitutesgroundsfrejection.1.EdgeType:Number1(doesnotapplytoendsofstrip)2.Finish:Freeofanydefmedmetal(burrs)thatprojectsabovetheplaneoftheteststriptopbottomsurfaces.3.PreBow:Thema

23、ximumallowedprebowfeithersideofeachstrip:N0.025mm(0.001inch)A0.025mm(0.001inch)C0.038mm.(0.0015inch)Posttemperingtreatmentstoachieveprebowflatnessarenotpermitted.FIGURE2ASSEMBLEDTESTSTRIPHOLDER1.Material:Therecommendedma

24、terialftheteststripholderisanyalloycarbonsteelwithminimum57HRctoadepthof0.7mmgreater.Alternatematerials(hardness)exteridimensionsmaybeusedwhentheirweardefmationacteristicsdonotadverselyaffecttheperfmanceoftheteststrip.2.

25、Attachmentholes:Onetwoadditionalholeseachwithamaximumdiameterof18mmmaybeaddedtofacilitatemountingtheholdertoafixture.Theholesmaybethreadedplainmayextendintothestripcontactsurfaceoftheholder.3.Screws:Usepanhead(smallerhea

26、ddiameter)stylescrewofsizeM5.Nowashersareallowedunderthescrewheadtoclamptheteststriptotheholder.Outer(top)surfaceSAEJ442RevisedFEB2013Page4of5FIGURE3TESTSTRIPGAGE1.DimensionalTolerances:0.5mmunlessotherwisespecified2.Fou

27、r4.76mmdiameterprecisionballsareinstalledintheteststriplocatingbase.Ballsshallbeinthesameplane(perpendiculartotheindicatstem)within0.05mm.3.Digitalindicatshallhave0.001mm(0.0001in)resolution(minimum).4.Theoptionalconfigu

28、rationwithonetwoendstops(posts)ispreferredbecausethestopspromoteunifmityoftestingbyensuringconsistentstripplacementuponthegage.4.NOTES4.1SupersededGageDesignationTwotypesofgageswerefmerlyusedtomeasurethearcheightoftestst

29、rips.Thenumber1gagewhichisobsoleteemployedtwoknifeedgestosuppttheteststripthenumber2gage(developedin1943)usesfourballstolocatetheteststripinrelationtotheindicatstem.Someengineeringcriteriamaycontinuetoshowthenumeral“2“af

30、tertheteststripletterdesignatingtheuseofanumber2gage.Thisdesignation(suchasA2)isneitherrequirednrecommended.ThegagedefinedbythisSAEStardusesthesamelocatingschemeasthenumber2gagetherefewillyieldanequivalentreading.SAEJ442

31、RevisedFEB2013Page5of54.2SupersededIntensityDesignationThepri“dimensionless“valuerelatingtothenumberofgraduationsonthedialindicathasbeendiscontinuedinfavofdirectreadinginmillimeters.4.3DimensionsUnlessotherwiseindicateda

32、lldimensionsareinmillimeters(mm).Inchdimensionsarelistedfconvenienceonlyplacedwithinparenthesis.4.4MarginalIndiciaAchangebar(I)locatedintheleftmarginisftheconvenienceoftheuserinlocatingareaswheretechnicalrevisionsnotedit

33、ialchangeshavebeenmadetothepreviousissueofthisdocument.An(R)symboltotheleftofthedocumenttitleindicatesacompleterevisionofthedocumentincludingtechnicalrevisions.Changebars(R)arenotusediniginalpublicationsnindocumentsthatc