Cold extrusion numerical simulation and load reducing
with highfrequency electrohydraulic vibration
DONG Mingfei, WANG Zhiheng, HU Xinhua, BAO Guanjun, YANG Qinghua
(Key Laboratory of E&M, Ministry of Education & Zhejiang Province, Zhejiang
University of Technology, Hangzhou 310032, China)
Abstract: Aiming at reducing the problems of large flow stress, high parts forming pressure in cold extrusion, a new technological measures was put forward, a new axial vibration excitation test platform and die of cold extrusion was designed. Finite element analysis model was established with Deform3d,the load shedding of model forming process was analyzed under axial vibration excitation, the forming pressure of universal joint shaft sleeve was simulated accurately, the forming pressure between traditional extrusion form and axial vibration excitation form were compared, the accuracy of FEM was verified by experiment. The experimental results indicate that new extrusion measures can reduce the forming pressure of universal joint shaft sleeve by 21.78%. Through experimental research, the new forming process can lay the foundation for some difficulty forming parts in cold extrusion.
Key words: cold extrusion; numerical simulation; highfrequency electrohydraulic vibration; universal joint shaft sleeve; forming pressure