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. © 2019, China Mechanical Engineering Magazine Office. All right reserved.