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研究电液颤振技术在冷挤压成形中应用的可行性。在室温下对6061铝合金坯料进行传统反挤压和电液颤振辅助反挤压。实验结果表明,给凹模施加频率为100 Hz、幅值为0.013 mm的颤振,可使最大挤压力下降5.65%。采用有限元软件Deform模拟反挤压过程,结果表明,在反挤压过程中,颤振可使坯料与模具之间的摩擦因数从0.2下降为0.1,改变材料流动的方向及提高材料流动的瞬时速度,同时使坯料承受较小的最大塑性应变,其应变分布较传统反挤压更均匀。
The feasibility of using electrofluidic chatter in cold extrusion is studied. 6061 aluminum alloy billets were subjected to conventional anti-extrusion and electro-dither assisted reverse extrusion at room temperature. The experimental results show that the maximum compressive force can be decreased 5.65% by applying the flutter with the frequency of 100 Hz and the amplitude of 0.013 mm to the die. The inverse extrusion process was simulated by finite element software Deform. The results showed that in the anti-extrusion process, the flutter reduced the friction coefficient between the blank and the die from 0.2 to 0.1, changed the direction of material flow and increased the instantaneous flow of material Speed, while allowing the billet to withstand smaller maximum plastic strain, the strain distribution more uniform than the traditional anti-extrusion.