Study on Metal Flow in Continuous Extrusion Cladding of Cable Aluminum Sheath Using FEM Analysis
Study on Metal Flow in Continuous Extrusion Cladding of Cable Aluminum Sheath Using FEM Analysis
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DOI：
10.4028/www.scientific.net/amr.189-193.1934
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发表时间：
2011-02
期刊：
影响因子：
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通讯作者：
Ying Zhao;B. Song;Jiu-yang Pei;X. Yun
中科院分区：
文献类型：
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作者：
Ying Zhao;B. Song;Jiu-yang Pei;X. Yun
本文对连续挤压复合过程进行了非稳态三维有限元模拟。该模型用于预测整个过程中的金属流动特性。根据金属流动特点，将连续挤压复合过程分为补缩、焊接、充型和成形四个阶段。模拟结果预测温度，应力，应变率和速度场。由于模具型腔结构的不对称性和上下温度的差异，金属在模具型腔中流动时，速度分布是不均匀的。有限元分析结果还表明，速度分布对芯棒半径的变化很敏感。增大芯棒半径可以相对提高上型腔金属流动速度，降低下型腔金属流动速度。存在一个使金属流动最均匀的最佳芯棒半径值。为优化工艺和模具设计提供了理论依据。
This paper analyzed continuous extrusion cladding process through 3D FE simulation in the non-steady state. The model is used to predict the metal flow characteristics during the entire process. According to the metal flow characteristic, continuous extrusion cladding process is classified into feeding, welding, filling and forming stages. The modeling results predict temperature, stress, strain rate and velocity fields. When the metal flows through the die bearing, the velocity distribution is non-uniformity, because of the non-symmetrical structure and the difference in temperature of the upper and bottom portion of the die cavity. And FEM results also show that the velocity distribution is sensitive to the change in mandrel radius. Increasing the mandrel radius can relatively improve the metal flow velocity in the upper cavity and decrease the velocity in the bottom cavity. There is an optimum mandrel radius value that makes metal flow most uniform. These also provide the theoretical basis for optimizing the technology and the die design.