二维电液颤振对冷挤压成形的影响

针对冷挤压成形过程中变形抗力大、金属流动困难导致模具磨损较大等问题，提出了一种二维电液颤振辅助冷挤压成形工艺，并运用Deform-3D有限元分析软件建立二维电液颤振辅助冷挤压成形的有限元模型，对比分析了无颤振成形方式以及轴向颤振激励下成形、径向颤振激励下成形及二维颤振激励下成形的成形过程。研究结果表明：与无颤振成形方式相比较，成形载荷在二维颤振激励、轴向颤振激励和径向颤振激励成形方式下，分别减小了26.1%、 13.2%和 5.7%。二维颤振激励成形方式下的成形载荷最小，且金属流速显著增大，应力场分布更加均匀。

Influences of Two-dimensional Electro-hydraulic Flutters on Cold Extrusion Forming

Aiming at the problems of large die wear in cold extrusion forming caused by large deformation resistance, metal flow difficulty, a two-dimensional electro-hydraulic flutter assisted cold extrusion forming process was proposed. Deform-3D FEA software was used to establish the finite element model of two-dimensional electro-hydraulic flutter assisted cold extrusion forming, and the forming processes without flutter mode, forming processes under axial flutter excitation, forming processes under radial flutter excitation and forming processes under two-dimensional flutter excitation were compared and analyzed. The research results show that compared with the non-flutter forming mode , the forming loads are decreased by 26.1%, 13.2% and 5.7% under the two-dimensional flutter excitation, the axial flutter excitation and the radial flutter excitation respectively. The forming load is the smallest under the two-dimensional flutter excitation forming mode, and the metal flow velocity is further increased, and the stress field distribution is more uniform.