中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 25 No. 9 September 2015 |
（1. Key Laboratory of Special Purpose Equipment and Advanced Manufacturing Technology,
Ministry of Education & Zhejiang Province, Zhejiang University of Technology, Hangzhou 310014, China;
2. College of Mechanical and Electrical Engineering, Jinhua Polytechnic, Jinhua 321007, China）
Abstract:The possibility of the electric-hydraulic chattering technology and its application in the cold extrusion were presented. The conventional and electric-hydraulic chattering assisted backward extrusion processes were performed on 6061 aluminum alloy billets at room temperature. The experimental results showed that 5.65% reduction in the extrusion load was attained if the die and ejector were vibrated at a frequency of 100 Hz and amplitude of 0.013 mm in the longitudinal direction. The friction coefficient at the billet and tool system interface determined from the finite element analysis (FEA) decreased from 0.2 without chattering to 0.1 with application of electric-hydraulic chattering. The higher values of instantaneous velocity and direction change of material flow were achieved during the chattering assisted backward extrusion process. The strain distribution of the chattering assisted backward extrusion billet revealed lower maximum strain and smoother strain distribution in comparison with that produced by the conventional extrusion method.
Key words: 6061aluminum alloy; conventional backward extrusion; electric-hydraulic chattering assisted backward extrusion; finite element analysis; material flow; strain distribution
