新型B路径的等通道转角挤压工艺

Equal channel angular pressing process with new route B

通过Deform-3D有限元软件,对一种新型B路径下的2024铝合金进行等通道转角挤压数值模拟。分析了等效应变大小及其分布规律,得到新型B路径下铝合金的变形特点。利用等通道转角挤压实验,验证了2024铝合金在新型B路径下变形模拟的可信性。结果表明:多道次等通道转角挤压后,新型B路径下的变形效果剧烈并且变形更均匀,试件均匀变形区扩大,头部、尾部也得到了充分变形;由于各方向上等效应变梯度的变化,等效应变均匀性随着道次的增加呈现出先上升、后下降的趋势。通过实验与仿真结果的对比发现,由于头部与主变形区的等效应变值接近,头部不会产生明显的翘曲。

The equal channel angular pressing process of 2024 aluminum alloy with new route B was numerical simulated by finite element software Deform-3 D,and the equivalent strain and its distribution law were analyzed to obtain the deformation characteristics of aluminum alloy under new route B.Then,the accuracy of deformation simulation for 2024 aluminum alloy with new route B was verified by equal channel angular pressing experiment.The results show that after multi-pass equal channel angular pressing,the deformation effect under new route B is severe and more uniform,the main deformation area of specimen is enlarged,and the head area and tail area deform fully.Due to the change of equivalent strain gradient in all directions,the uniform of equivalent strain increases firstly and then decreases with the increasing of passes.By comparing the experimental and the simulation results,the head does not warp because of the similar equivalent strain between the head and the main deformation areas.