e9厚板淬火温度和应力演变影响的数值模拟.pdfVIP

嗣制造业信息化 凹皿互雹墨皿墨五墨圆 表面换热系数对铝厚板淬火温度和应力演变影响的数值模拟 姚灿阳。吴运新。袁望姣 (中南大学机电工程学院，长沙410083) 摘 要：淬火过程中表面换热系数是反映界面能量传递和介质冷却能力的重要物理参数。通过对铝厚板淬火的多组模 拟实验，研究了表面换热系数对工件冷却速度、内应力演变的影响规律。结果表明，过大的表面换热系数并不能明显提 高工件心部的冷却速度，却大大增加了工件的残余应力。铝厚板淬火工艺应根据工件的组织性能要求，合理选择表面换 热系数和冷却方式，尽量减小工件的残余应力。 关键词：铝合金；淬火；换热系数；冷却速度；残余应力 中图分类号：TGl56．3 文献标识码：A 文章编号：1002—2333(2007)03一0058一03 Numerical theEffectofSurfaceHeatTransferCoemcientonEvolvement Simulating of andStressofThickAlmninumPIate Temperature AlIoy YA0 WU YUAN Can_yang，Yun_x沁 Wang’jiao ofMechanicalandE1eclrical South (College E“gineering，CPntralUniVer8ity，Cha“gsha410083，China) heattransfercoeffjcjenLjsan whjchreflects tmnsferof Abstract：Surface imponantphys记alparameter energy interfaceand ofmPdium．Basedonsevcral ofsimulated with thick c001ingcapability groups experimentquenching efkctofthesu—aceheattransf套rcoemcientonthe and aluminum residualsn!essofthe alloypiate，the coolingvelocjty beenstu(1iPd．’rheindirates“1atheattransfbr work has resuIt excessive coem(：ientcan’t the piece marke‘llyimprove rateint11ecentreofwork in(：reasetheresidualstI’essofit．When thickalumjnum cooling piece，butgreatly quenching sudhcehcattransfbrcoemcientand modeshouldbe chosensothattheresidual a110yplate，the cooling appropriately stressofitcanbefanhestminimized． words：aluminum transfer rate；resjdual8tress Key a儿oy；quenching；heateoefbcjent；c