【摘要】 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。更多还原

【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.更多还原