差温无模预成形锻造的有限元模拟研究  

FE simulating study on thermal differential mouldless preform forging

作　　者：鲁世强[1] 刘志和[1] 王高潮[1] 刘华[1] Meng Hua 

机构地区：[1]南昌航空工业学院,南昌,330034 [2]香港城市大学

出　　处：《塑性工程学报》2002年第2期17-22,共6页Journal of Plasticity Engineering

基　　金：香港特别行政区研究基金 (ProjectNo .CityU 90 4 0 4 17)资助 ;江西省材料科学与工程研究中心基金资助项目CL0 2 0 1

摘　　要：利用热力耦合有限元方法 ,对AISI10 4 5钢圆柱体坯料在环形加热源局部加热下的差温无模预成形锻造过程进行了模拟研究。模拟结果表明 ,在坯料中获得和控制大梯度分布的不均匀温度场是实现无模预成形锻造的关键。复杂零件成形必须合理地组合加热源和冷却源 ,以便产生所需的温度梯度场。在快速变形条件下 ,变形过程中的持续加热对金属的流动影响甚微 ,变形前的温度分布基本上决定了金属的流动 ,但在慢速变形条件下 ,变形过程中的持续加热对金属的流动产生一定的影响 ,其影响程度视零件复杂程度而异。从该文研究结果可以预见 。The simulating study for the thermal differential mouldless preform forging of AISI1045 steel cylindrical billet subjected to local ring heat sources was performed by coupled thermal\|viscoplastic FEM.The results showed that obtaining and controlling large temperature gradients within billet are the keys for mouldless preform forging.In order to produce the expected temperature distributions for forging of complex geometries,heating and cooling sources must be appropriately combined.The metal flow in fast forging is basically controlled by the temperature distributions prior to deformation and is affected very slightly by the continuously in\|situ heating during deformation.However,the metal flow in slow forging is,affected by the continuously in\|situ heating during deformation,which is related to complex extent of component.Based on the results of the presented study,it can be predicted that the thermal differential mouldless forging can be developed as a new process of the mouldless making billet.

关 键 词：差温锻造 无模顶成形 有限元模拟 热力耦合 无模锻造 

分 类 号：TG316[金属学及工艺—金属压力加工] O241.82[理学—计算数学]