塑性成形过程材料的轴向分流特征  

Mechanism of material axis split flow characteristics in plastic forming processing

作　　者：李旭斌[1] 张治民[1] 王强[1] 李国俊[1] 于建民[1] 

机构地区：[1]中北大学材料科学与工程学院,太原030051

出　　处：《塑性工程学报》2016年第2期16-21,74,共7页Journal of Plasticity Engineering

基　　金：国家973预研项目(2012CB626808)

摘　　要：轴向分流成形可改善金属流动方式并有效降低大型复杂构件的成形力。针对塑性成形中材料轴向分流成形特征,基于经典塑性理论,研究材料分流成形过程中各变形区域的流动规律,应用塑性力学分析法解析分流面半径值与模具及坯料几何参数间的关系,并构建分流面半径数学模型。试验验证表明,该模型可为轴向分流成形坯料精确设计提供理论参考。基于能量理论并综合考虑构件复杂系数,建立轴向分流成形单位成形力数学模型。进行不同温度下成形试验及有限元模拟分析比较,该模型与试验数据之间的灰关联度达到0.91,高于传统的有限元法与实测值间的灰关联度0.83;模型的平均绝对误差为0.68×10^3 kN,有限元法计算的平均绝对误差为2.2×10^3 kN,构建的成形力数学模型具有较高的准确性,对轴向分流成形的工程应用具有理论指导意义。The way of metal flow can be improved and effectively reduce the forming force of large complex components in axial split forming.Aiming at axial split characteristics in plastic forming process,the materials flow regularity of the deformation area in the process of split forming process based on the classical plasticity theory was studied.Split flow radius value relation with mould and geometric parameter were analyzed using the theory of principal stress analysis,and constructed the model of axial split flow radius numerical.The test shows that the model could be used to accurate design of axial split forming blank.Based on energy theory and considering the complex coefficient,the axial split forming unit forming force calculation model was derived.The experiment and FEM model in different temperature was carried out for comparison with the model,the grey correlation degree between the experiment and test value is 0.91,relatively,0.83 with the traditional FEM;The average absolute error of model is0.68 ×10^3 kN with the FEM is 2.2×10^3 kN.The test results show the high accuracy of the model.The results in this paper can be used in the theoretical guidance for practical engineering application of axial split flow forming.

关 键 词：轴向分流 分流面半径 能量理论 单位成形力 

分 类 号：TG376[金属学及工艺—金属压力加工]