铝合金挤压模具型腔曲线优化设计  

Die container optimum design for aluminum alloy extrusion

作　　者：舒洁[1] 刘全坤[1] 胡龙飞[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2008年第1期85-88,共4页Journal of Hefei University of Technology：Natural Science

基　　金：教育部博士点专项科研基金资助项目(20030359002)

摘　　要：应用上限法建立铝合金圆棒料挤压成形的流动模型,推导了坯料在5种不同型腔曲线下变形时的动可容速度场、应变速率场及上限功率的表达式。同时,以挤压力最小为优化目标,对成形过程进行优化,获得最低能耗下的型腔曲线长度;为验证上限解的可靠性,采用FEM对最佳型腔曲线长度下棒料成形过程进行数值模拟,得到了挤压力与型腔曲线表面接触应力的分布曲线,数值解与理论解相吻合;结果表明,在最佳型腔曲线长度及相同的断面缩减率下,3次曲线和余弦曲线为最优的模具型腔曲线。An extrusion flow model of aluminum alloy cylinder is built by the upper-bound method, and the kinematically admissible velocity field, the strain rate field and the upper-bound deformation power are deduced with five different die containers. In addition, aiming at reducing the extrusion power, the length of the die containers is optimized. The FEM is used to simulate the extrusion process with the best die container length, then the distribution of extrusion power and die contact stress is obtained, and it can be seen that the theoretical results are in good accordance with the simulation results. The results shows that, with the best die container length and the same area reduction ratio, the third-order polynomial die and the cosine die are the best amongst the profiles considered.

关 键 词：挤压 上限法 型腔曲线 优化 

分 类 号：TG375.4[金属学及工艺—金属压力加工]