Deformation Analysis of Co-Extrusion Process of Aluminum Alloy and Copper Alloy
Deformation Analysis of Co-Extrusion Process of Aluminum Alloy and Copper Alloy
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DOI：
10.4028/www.scientific.net/kem.340-341.645
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发表时间：
2007-06
期刊：
影响因子：
--
通讯作者：
D. Jang;B. Hwang
中科院分区：
文献类型：
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作者：
D. Jang;B. Hwang
本文主要对双金属共挤过程的塑性变形进行分析。挤压与材料的大变形有关，并导致工件材料内的不均匀变形。复合棒挤压过程中的塑性变形机理比单一金属挤压过程中的塑性变形机制复杂得多。两种不同材料共挤出的变形模式由多个工艺参数来表征。在本文中，分析的重点是研究沿两种不同材料之间的界面的接触条件的影响。采用硬塑性有限元方法对共挤过程进行分析。所选材料为AA 1100铝合金作为硬质材料，CDA 110作为软质材料。这种类型的材料选择是为了检查硬芯和软套管在变形模式方面的效果，反之亦然。初始复合材料坯料是通过分别以紧密（0.023mm）和弱（0.012mm）过盈结合插入芯材来制备的。模拟了四种不同的共挤工艺在材料组合和过盈粘合方面的情况，以研究芯部和套筒之间的材料排列以及粘合对塑料区域的影响。从模拟结果可以看出，共挤过程中的塑性区域受材料排列选择或建筑材料之间的粘合条件的影响不大。然而，从模拟结果可以看出，每种结构材料的挤压比，即共挤压的均匀性，很大程度上取决于材料的排列和粘合条件。
This paper is concerned with the analysis of plastic deformation of bimetal co-extrusion process. Extrusion is related to large deformation of material and leads to non-homogeneous deformation within work-piece material. The mechanism of plastic deformation during the composite rod extrusion is much more complicated than that in single metal extrusion. Deformation patterns of co-extrusion of two different materials are characterized by several process parameters. In this paper, the analysis is focused to investigate the effect of contact conditions along the interface between two different materials. The rigid-plastic finite element method was applied to the analysis of co-extrusion process. The selected materials are AA 1100 aluminum alloy as hard material and CDA 110 as soft one. This type of material selection was to examine the effect of hard core and soft sleeve and vice versa in terms of deformation pattern. The initial composite billets were prepared by inserting the core material in tight (0.023mm) and weak (0.012mm) interference bonding, respectively. Four different cases of co-extrusion process in terms of material combination and interference bonding were simulated to investigate the effect of material arrangement between core and sleeve, and of bonding on the plastic zones. It is concluded from the simulation results that the plastic zones in this co-extrusion process are not influenced much by the selection of material arrangements or bonding condition between construction materials. However, it was seen from the simulation results that the extrusion ratio of each construction material, i.e. homogeneity of co-extrusion, depends much on the material arrangement and the bonding condition.