h13钢汽车热锻模具

334Vol133No14FORGING&STAMPINGTECHNOLOGY20088Aug.2008H131,2,1,1(1.,102206;2.,071003):,,,,,,,:;;H13;:TG142145:A:100023940(2008)0420083204StudyonfailuremechanismofH13steelhot2forgingdiesforautomobileWANGMeng1,2,LIUZong2de1,BAOZhi2jian1(1.KeyLaboratoryofConditionMonitoringandControlforPowerPlantEquipmentofMinistryofEducation,NorthChinaElectricPowerUniversity,Beijing102206,China;2.DepartmentofMechanicalEngineering,NorthChinaElectricPowerUniversity,Baoding071003,China)Abstract:Thefailuremechanismwasanalyzedonautomobilehot2forgingdiesbymeansofEDS,micro2hardnessandmetallographicexamination.Theresultsshowthatsurfaceoxidationanddispersingofalloyingelementsinsurfacelayerleadtothereductionofhardness,wearresistanceandhotstrengthofthesteel,whichcausetheinitialsurfacecracks.Continuouspropagationofthecracksresultsinthefinalfailureofthedies.Keywords:hot2forgingdies;failureanalysis;H13steel;metallographicexamination:2007212225;:2008202220:(IRT0720);:(1967-),,,:wangmeng2146@1631com1,,,1/31/5[1],,,,,,,2,H,,,H13(4Cr5MoSiV1),1:3,4952HRC1H13(%,)Table1ChemicalcompositionofdiesteelH13(%,massfraction)CSiMnCrMoVPS0132014501801120012001504175515011101175018011200103001030,12001300,,600700,,012014s,,,16001800,55007000,40005000,,1[2]©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:[1],,311,,:(1a),,(),.(1b)1(a)(b)Fig11Exteriorwearandtear(a)andsurfacechaps(b)ofhot2forgingdies,,,,,,,,5mm,,,,013mm,,312,,,,10mm10mm6mmPhilpsquant2200,(SEM),2,,,,,,,,,200m80m,2Fig12MicrographsofCrack313,,(EDS),,3aGENESIS,EDS,3b3c212,,,,;Mn,Mo,V,Si,1,,,Mn,Mo,V,Cr,,,,,4833©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(a)EDS(b,c)(a)1000(b)A(c)BFig13Scanningplaces(a)andtheirenergyspectrumanalysis(b,c)(a)Scanningplaces1000(b)AtcrackA(c)NearcrackB,,,,,,,,2(%,)Table2Comparitionofchemicalcompositioninandnearthecrack(%,massfraction)COSiMoVCrFe2017135123%%%1144421614117681471180171081158218526145314FM2300,100g,,300800m,;,,,195455HV,H13500HV,,,,,,,4,,,,4Fig14Micro2hardnesscurveoffailuredie,,,,,,,,,,,,,,,,,,,,[425],,,[6]4(1):584:H13©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(,400050):(),,,,,,,,:;;;:TG376:A:100023940(2008)0420086203FormingtechnicofpinionpartsanddesignofdieLVLin,DENGMing(CollegeofMaterialScienceandEngineering,ChongqingInstituteofTechnology,Chongqing400050,China)Abstract:Theformingtechnologyofsplineandgearofpinion,whichbothhadgearandsplinewasanalyzed.Thetech2nologyofcoldextrusionwasusedtosavecostandformsuccessfully.Also,thedieofsplinedirectextrusioncombinedwithgearindirectextrusionwasdesigned.Theresearchresultshowsthattheprocessofcoldextrusionisfeasibleinpinionforming,thedesignofdiesisreasonable,thefineshapeofsplineandgearcanbegainedaswellasgoodsurfacequality,andthematerialcost,theauxiliarytimeandtheproductioncostarereduced.Keywords:gear;spline;coldextrusion;die1,:2007205216;:2007207220:(1968-),,,:lulin@cqit1edu1cn,,,,,[1],,,(2),,,,(3),,,(4),,:[1],.[M].:,2005.[2].[D].:,2006.[3],.[M].:,2001.[4].[M].:,2000.[5]JohnsonPK,AranaM,OstolazaM,etal.Crackinitiationinacoatedanduncoatednickel2basesuperalloyunderTMFconditions[J].JournalofEngineeringforGasTurbinesandPower,1998,10:7912795.[6],,,.[J].,2001,(1):17220.[7],,,.[J].,2006,31(1):61263.[8],,,.[J].,2001,(5):58260.©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.