Characteristics of metal flow in cold extrusion under electric-hydraulic chattering
Characteristics of metal flow in cold extrusion under electric-hydraulic chattering
复制标题
电液颤振下冷挤压金属流动特性
DOI：
10.1016/s1006-706x(17)30020-1
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发表时间：
2017-02-01
影响因子：
2.5
通讯作者：
Yang, Qing-hua
中科院分区：
文献类型：
--
作者：
Wang, Zhi-heng;Zhan, Wei-tao;Yang, Qing-hua
建立了冷挤压过程电液颤振实验装置，介绍了其工作原理。利用Deform-3D软件建立了一种材料为20Cr的杯形零件的有限元模型。进行了有和无电液抖振的有限元仿真实验，分析了速度场和金属网格流线。对杯形零件进行了不同条件下的挤压实验。利用扫描电子显微镜和Keyence超深度三维显微系统，讨论了有电液抖振和无电液抖振时金属流线的差异。结果表明：随着电液颤振的增加，物料流动速度增大，变形阻力减小；电液颤振使金属流动容易，金属流线弯曲程度小，金属晶粒细长致密，从而提高了变形件的质量。
An experimental setup for cold extrusion process with electric-hydraulic chattering was developed and its working principle was introduced. The finite element (FE) model for a kind of cup part (material: 20Cr) was built by using the software Deform-3D. FE simulation experiments with and without electric-hydraulic chattering were carried out to analyze the velocity fields and the metal grid flow lines. The extrusion experiments of the cup part were also performed under different conditions. The difference of metal flow lines with and without electric-hydraulic chattering was discussed via a scanning electron microscope (SEM) and the Keyence super-depth three-dimensional microscopic system. The results showed that with the electric-hydraulic chattering, the velocity of material flow increases, whereas deformation resistance decreases. Electric-hydraulic chattering results in easy metal flow, small bending degree of metal flow lines, slender and dense metal grains, and thereby an improved quality of the deformed parts.