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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.4; Jul 7-11, 2003; Leganes, Madrid, Spain >Multi Equal Channel Angular Pressing with Rotational Dies
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Multi Equal Channel Angular Pressing with Rotational Dies

机译：带旋转模具的多等通道角冲压

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摘要

The recent successful development of the equal channel angular pressing (ECAP) process in metals provides a feasible solution to produce ultra-fine or nano-grained bulk materials with tailored material properties. However, ECAP is difficult to scale up commercially due to excessive load requirements. In this paper, a new Multi-ECAP process with die rotation is considered to obtain ultra-fine grain structured materials under a moderate deformation force. It is shown that an addition of torsion results in a reduction in the pressing force and an increase in severity of plastic deformation. An analysis using the upper bound method is found to be useful in predicting the pressing load and flow pattern of ECAP with and without rotational dies. Solutions are obtained for different inclined channel angles under different angular velocities of dies. Relative pressures are presented and some computed solutions are compared with those found by FEM simulation. The theoretical predictions of the pressing load are in good agreement with the simulation results. The amount of plastic deformation is determined by the inclined angle between the two intersecting channels, and the velocity ratio between the angular velocity of dies and the normal component of the punch velocity.
机译：金属中的等通道角挤压（ECAP）工艺的最新成功开发为生产具有定制材料性能的超细或纳米晶粒的散装材料提供了可行的解决方案。但是，由于负载需求过大，ECAP很难在商业上进行规模扩展。在本文中，考虑采用新的带有模具旋转的Multi-ECAP工艺，以在中等变形力下获得超细晶粒结构材料。结果表明，增加扭力会导致压紧力降低和塑性变形的严重性增加。发现使用上限方法进行的分析对于预测带有或不带有旋转模具的ECAP的挤压载荷和流动方式很有用。在模具的不同角速度下获得不同倾斜通道角度的解决方案。提出了相对压力，并将一些计算出的解决方案与通过FEM仿真找到的解决方案进行了比较。压力载荷的理论预测与仿真结果吻合良好。塑性变形的量取决于两个相交通道之间的倾斜角度，以及模具角速度和冲头速度的法向分量之间的速度比。

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