Backward rod extrusion of bimetallic aluminum-copper alloys at room temperature
Backward rod extrusion of bimetallic aluminum-copper alloys at room temperature
复制标题
铝铜双金属合金室温后向棒材挤压
DOI：
10.14279/depositonce-10059
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
S. Mueller
中科院分区：
文献类型：
--
作者：
Vidal Sanabria;S. Gall;F. Gensch;R. Nitschke;S. Mueller
。研究了双金属铝-铜合金的室温反挤压成形。分别选用EN AW-1080A铝合金和铜合金Cu-ETP制备铸坯的型芯和套筒。铜的横截面相当于铸坯的30%。采用90°圆锥模角挤压，挤压比为14：1。实验结果表明，模面磨痕与石墨箔的结合，大大降低了铜与圆锥模间的摩擦。因此，在挤压过程的稳态过程中，铝和铜在轴承通道中的物质流动是均匀的。然而，在工艺结束时，铜套发生了多处断裂。应用基于有限元的有限元软件Deform 2D对挤压过程进行了数值模拟，以估算状态变量和材料流动。为了便于数值分析的验证，在整个过程中记录了模具和凸模的温度变化以及模具挤压力。
. The backward rod extrusion of bimetallic aluminum-copper alloys at room temperature was investigated. The aluminum alloy EN AW-1080A and the copper alloy Cu-ETP were selected to prepare the core and sleeve of the billet respectively. The copper cross section was equivalent to 30% of the billet. Moreover, the billet was extruded applying a conic die angle of 90° and an extrusion ratio of 14:1. Experimental results demonstrated that the combination of grounding marks on the die surface and the application of graphite foil reduced drastically the friction between copper and the conic die. Thus, a uniform material flow of aluminum and copper through the bearing channel was observed during the steady state of the extrusion process. However multiple fractures of the copper sleeve occurred at the end of the process. The extrusion process was numerically simulated applying the FEM-based software Deform 2D in order to estimate the state variables and material flow. The die and punch temperature evolution, as well as the die extrusion force were recorded during the whole process to facilitate the validation of the numerical analysis.