Numerical Optimization of Bearing Length in Composite Extrusion Processes
Numerical Optimization of Bearing Length in Composite Extrusion Processes
复制标题
复合材料挤压过程中轴承长度的数值优化
DOI：
10.4028/www.scientific.net/kem.367.47
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
A. Tekkaya
中科院分区：
文献类型：
--
作者：
Thomas Kloppenborg;M. Schikorra;M. Schomäcker;A. Tekkaya
挤压过程中轴承长度的减少导致材料流的增加，并通过此提供了操纵和优化的可能性。本文提出了一种基于模拟的优化技术，利用这种效果，优化直接挤压过程中的材料流动。首先将该方法应用于等节圆型材的多次挤压过程，然后应用于非对称型材的挤压过程。此外，复合挤压工艺进行了分析，其中无端线的高强度钢嵌入在一个基础材料的铝。将增强元件插入到基础材料流中，特别是在型材厚度和增强直径之间的小比率内，可能导致模具内的显著局部扰动，这导致不期望的型材缺陷。因此，基于模拟的优化方法特别适用于复合材料型材中的非均匀壁厚优化。
The decrease of the bearing length in extrusion processes results in increasing of the material flow and offers, through this, the possibility for manipulation and optimization. This paper presents a simulation based optimization technique which uses this effect for optimizing the material flow in direct extrusion processes. Firstly, the method is used in a multi-extrusion process with equal pitch circle profiles, then in an extrusion process of an asymmetric profile. Furthermore, a composite extrusion process is analyzed where endless wires of high strength steel are embedded in a base material of aluminum. The insertion of reinforcement elements into the base material flow, especially within the small ratio between profile thickness and the reinforcement diameter, can lead to significant local disturbances inside the die, which result in undesirable profile defects. Hence, the simulation-based optimization method is especially used to optimize inhomogeneous wall thicknesses in composite profiles.