3D打印零件的转折角度对成形温度和应力的影响-王福雨

452Vol.45,No.220162RAREMETALMATERIALSANDENGINEERINGFebruary20162015-01-28(2013ZX04001-041)1987110016024-8360117E-mail:[e-mail]3D1,211111,21,2(1.110016)(2.100049)3D3D3DTC4TG146.2+3A1002-185X(2016)02-0515-073D3D[1,2][3][4,5][6]3D3D[7][8][9][10][11]3D3D(1)(2)Pσd=TVBVPσ(1)TBVTBUε=Buε(2)u=Dσε(3)D2J51645(1)=DhΘσεΘΔΔ−Δ(4)DΘh(1)(2)(4)ddTTVVBDBuVPBhVΘΔ=Δ+ΔΘ(5)(5)22()thijijttεαΘΘ∂∂=∂∂(6)thijtε∂∂()ijaΘMSC.Marc60mm45mm5mm25mm15mm2.8mm30º60º90º120º150º180º180º11Fig.1Finiteelementmodels:(a)30º,(b)60º,(c)90º,(d)120º,(e)150º,and(f)180º5344~55054875~49531TC4Ti-6Al-4V23D32,3,43D0.5g2345560º90ºabcdef23D517Table1ExperimentparametersLaserpower/WScanningspeed/mm·s-1Powderfeedingspeed/g·min-1MachinetoolaccelerationAnglechange/(°)1700310Infinity,0.5g306090120150180TC4Table2PartsofthermophysicalparametersofTC4powder//W·(K·m)-1Cp/J·(kg·K)-1E/GPa-5-1l/10Kα×/kg·m-32017.0500120.00.9000.300442020015.0580110.00.9650.310442040015.059588.01.1070.325442060016.061570.01.0040.3424420153020.07603.51.0050.384420165020.58403.01.0060.3844420200021.07300.11.0080.39044202()Fig.2Temperaturefieldcloudpictureswhentheheatjustarrivesthecorner:(a)30º,(b)60º,(c)90º,(d)120º,(e)150º,and(f)180º623()Fig.3Temperaturefieldcloudpictureswhentheheatjustleavesthecorner:(a)30º,(b)60º,(c)90º,(d)120º,(e)150º,and(f)180º37~97~9[12]abcdefabcdef518454()Fig.4Temperaturefieldcloudpicturesofthemachinetoolnonstop:(a)30º,(b)60º,(c)90º,(d)120º,(e)150º,and(f)180º5Fig.5Temperaturecontrastcurves6Fig.6Curvesofmaximumtemperaturegradients7(MPa)Fig.7Thermalstressfieldcloudpicturewhentheheatjustarrivesthecorner:(a)30º,(b)60º,(c)90º,(d)120º,(e)150º,and(f)180º8(MPa)Fig.8Thermalstressfieldcloudpictureswhentheheatjustleavesthecorner:(a)30º,(b)60º,(c)90º,(d)120º,(e)150º,and(f)180º1060º0306090120150180192019401960198020002020Temperature,Θ/oCα/(o)JustarrivingJustleavingNonstopabdcefabdcefabdcef306090120150180α/(º)6.56.05.55.04.5TemperatureGradients,ΔΘ/105·m-1JustarrivingJustleavingNonstop23D5199(MPa)Fig.9Thermalstressfieldcloudpicturesofthemachinetoolnonstop:(a)30º,(b)60º,(c)90º,(d)120º,(e)150º,and(f)180º60º120º60º90º61090º60º90º90º90º10Fig.10Thermalstresscontrastcurves10.08333s715.9s111111a11b90º90º90º60º90º2120º90º3D111Fig.11Curvesofthetemperaturewithtimeoffirstlayers:(a)30º,60º,90º,and(b)120º,150º,180º3060901201501808.28.38.48.58.68.78.8ThermalStress,σ/2MPaAngle/(o)abdcef03691215176018001840188019201960Temperature,Θ/oCTime,t/s120o150o180ob03691215176018001840188019201960Temperature,Θ/oC30o60o90oaJustarrivingJustleavingNonstop52045CO210.5g1112110.7mm1750TC43D19168.7%12Fig.12Curvesofthetemperaturewithtimeoffirstlayers:(a)30º,(b)60º,(c)90º,(d)120º,(e)150º,and(f)180º1390º90º90º141430º60º90º120º13Fig.13Temperaturechangerangeabilitiesindifferentscanningcorners180º306090120150180200400600Temperature,Θ/oCα/(o)SimulatedMeasured03691215200016001200800400Temperature,Θ/a03691215200016001200800400b03691215200016001200800400c03691215Time,t/s200016001200800400Temperature,Θ/d03691215Time,t/s200016001200800400e03691215Time,t/s200016001200800400fSimulatedMeasuredSimulatedMeasuredSimulatedMeasuredSimulatedMeasuredSimulatedMeasuredSimulatedMeasured23D52114Fig.14Photosofobjectsafterprocessing:(a)30º,(b)60º,(c)90º,(d)120º,(e)150º,and(f)180º1)90º2)8.7%3)3D90º90º90º4)3DReferences[1]WangHuaming().ActaAeronauticaetAstronauticaSinica()[J],2002,23(5):473[2]LaiYoubin(),LiuWeijun(),KongYuan()etal.RareMetalMaterialsandEngineering()[J],2013,42(7):1526[3]LuPenghui(),LiuJianrui(),HuangWeidong()etal.RareMetalMaterialsandEngineering()[J],2012,41(2):315[4]ZhangKemin,ZouJianxin,LiJunetal.TransactionsofNonferrousMetalsSocietyofChina[J],2012,22:1817[5]LiuShasha(),WangYuhang(),ZhangWeiping().RareMetalMaterialsandEngineering()[J],2014,43(5):1041[6]SongJianli()LiYongtang(),DengQilin()etal.ChineseJournalofMechanicalEngineering()[J],2010,46(14):29[7]LiPeng,YangTaiping,LiShengetal.InternationalJournalofMachineToolsandManufacture[J],2005,45:1288[8]ZhaoHuihui,ZhangGuangjun,YinZiqiangetal.JournalofMaterialsProcessingTechnology[J],2011,212:276[9]ZhaoHH,LiHC,ZhangGJetal.AdvMater[J],2013,33:402[10]ShuaiCijun,FengPei,GaoChengdeetal.MathematicalAndComputerModellingofDynamicalSystems[J],2013,19(1):1[11]JiaWenpeng(),LinXin(),HuangWeidong()etal.RareMetalMaterialsandEngineering()[J],2007,36(7):1193[12]DiQiuyue().Material&HeatTreatment()[J],2011,40(6):123InfluenceoftheCornerAngleof3DPrintingPartsonTemperatureandThermalStressWangFuyu1,2,LiuWeijun1,ZhaoJibin1,KongYuan1,ZhaoYuhui1,LaiYoubin1,2,HanWenchao1,2(1.ShenyangInstituteofAutomation,ChineseAcademyofSciences,Shenyang110016,China)(2.UniversityofChineseAcademyofSciences,Beijing100049,China)Abstract:During3Dprintingprocessingofcomplexparts,manyprocessingdefects,suchascracks,burr,andcollapseappeareasilyinthescanningaroundthecorner.Toreducethescanningdefectsofdifferentanglecorners,thethermo-mechanicalcouplingfieldofdifferentpartsweresimulatedandthethermalandstresscloudpictureswereanalyzed.Therelationshipamongthemachinetool'sacceleration,thesizeofangle,thetemperatureofthecorner,temperat