Influence of electric-hydraulic chattering on forward extrusion process
Influence of electric-hydraulic chattering on forward extrusion process
复制标题
电液颤振对正向挤压过程的影响
DOI：
10.1007/s00170-015-7486-3
复制
发表时间：
2016-02
影响因子：
3.4
通讯作者：
Xue, Junyi
中科院分区：
文献类型：
--
作者：
Wang, Zhiheng;Bao, Guanjun;Hong, Xiaoxiao;Xue, Junyi
振动辅助金属成形技术是近年来发展起来的一种改善成形过程中材料流动的有效技术。然而，一些技术挑战，如振动产生的大功率要求和金属成形过程控制的技术复杂性，难以解决。本文主要研究电液颤振在冷挤压过程中应用的可能性。进行了一系列有、无电液颤振辅助的正挤压实验和有限元模拟。实验结果表明，当油压为8MPa、振动频率为200Hz的电液振动叠加在下模上时，最大挤压载荷降低了5.1%。油压对挤压载荷的降低效果比振动频率更显著。使用所提出的设计观察到成形部件的表面光洁度的显著改善。振动挤压过程中材料流动速度呈周期性变化，最大速度高于常规挤压过程。角部区域的材料流动得到改善。由于颤振的存在，有效应力分布呈周期性变化。然而，最大有效应力近似等于通过常规方法获得的应力。此外，有效应变分布是更均匀的相比，由传统的挤压工艺产生的。
Vibration-assisted metal forming is one of the most recent and beneficial techniques used to improve material flow of the forming process. However, some technical challenges, such as the large power requirement of vibration generation and technical complexity of the metal forming process control, are difficult to solve. The main objective of this work is to investigate the possibility of applying electric-hydraulic chattering in the cold extrusion process. A series of forward cold extrusion experiments and finite element simulations were performed with and without electric-hydraulic chattering assistance. The experimental results showed that the maximum extrusion load was decreased by 5.1 % when electric-hydraulic chattering with an oil pressure of 8 MPa and a vibration frequency of 200 Hz was superimposed on the lower die. The effect of the oil pressure was more significant than the vibration frequency for the reduction of the extrusion load. A significant improvement in the surface finish of the formed parts was observed using the proposed design. The velocity of material flow during chattering extrusion process was changed cyclically, and the maximum velocity was higher than that achieved from the conventional extrusion process. The material flow at the corner area was improved. The effective stress distribution was altered periodically due to the chattering. However, the maximum effective stress was approximately equal to that attained by conventional method. Moreover, the effective strain distribution was more uniform compared to that produced by the conventional extrusion process.
登录
查看更多内容
影响因子：
0.8
作者：
M. Susan;Leandru-Gheorghe Bujoreanu
通讯作者：
M. Susan;Leandru-Gheorghe Bujoreanu
DOI：
10.1016/s0007-8506(07)60810-5
发表时间：
1997
期刊：
CIRP Annals
影响因子：
--
作者：
K. Osakada;X. Wang;S. Hanami
通讯作者：
K. Osakada;X. Wang;S. Hanami
DOI：
10.1007/s00170-012-3976-8
发表时间：
2012-03
期刊：
The International Journal of Advanced Manufacturing Technology
影响因子：
--
作者：
X. Shan;Haiqun Qi;Lili Wang;T. Xie
通讯作者：
X. Shan;Haiqun Qi;Lili Wang;T. Xie
影响因子：
6.3
作者：
K. Osakada;X. Wang;S. Hanami
通讯作者：
K. Osakada;X. Wang;S. Hanami
影响因子：
4.2
作者：
Yanxiong Liu;Qingyou Han;L. Hua;Clause Xu
通讯作者：
Yanxiong Liu;Qingyou Han;L. Hua;Clause Xu