Load shedding principle of flutter cold extrusion and its simulation

JI Chao-ping，DONG Ming-fei，WANG Zhi-heng，BAO Guan-jun，YANG Qing-hua

（Key Laboratory of E&M（Zhejiang University of Technology），Ministry of Education & Zhejiang Province，

Hangzhou 310032，China）

Abstract：Aiming at the problem of high resistance to deformation and large tonnage equipment，while the common vibration forms have unsatisfied load shedding，flutter stimulation is imported into the metal cold extrusion process will contribute to the reducing of the forming resistance，from the view of a surface effect，the friction variation during the metal cold extrusion process under flutter stimulation was analyzed. The basical principle of vibration load shedding was illuminated. The basical principle of load shedding under flutter stimulation was illuminated. Taken the universal-joint sleeve as the example，Deform-3D software was used for the establishment of the finite element analytical model. The simulation results implied that the maximum forming resistance of the universal-joint sleeve cold extrusion reduces 8.3%，and the final forming resistance reduces 10.1% under the periodic flutter stimulation of frequency 100 Hz and amplitude 0.03 mm. The wear extent of the single punch also reduced，while that of the die increased.