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首页> 外文期刊>Journal of Materials Engineering and Performance >Comparison of Extrusion Strains Produced by Cosine and Conical Dies
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Comparison of Extrusion Strains Produced by Cosine and Conical Dies

机译：余弦和圆锥模产生的挤出应变的比较

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摘要

Visioplastic analysis is used to compare strain fields produced in cylindrical aluminum billets extruded at elevated temperature through axially symmetric dies that have either a cosine or a conical profile. The visioplastic method consists of computing strain rates from changes experienced in a flow function as a billet passes through the extrusion die. The flow function is constructed using a grid that is stamped on an axial plane of the billet before extrusion. After the partially extruded billet is removed from the die, numerical methods are used to determine the strain rates from the deformed grid. The state of strain over the extrusion region is computed using transformation and then integration of the strain rates. Results show that, unlike the conical die, the cosine die does not produce strains of reversed sign in the die entry region. The consequent benefits of using cosine dies for extrusion of powder metals are discussed.
机译：粘塑性分析用于比较在高温下通过具有余弦或圆锥形轮廓的轴向对称模具挤出的圆柱形铝坯料中产生的应变场。粘塑性方法包括根据坯料通过挤压模时流动函数的变化来计算应变率。流动功能是使用在挤压前在钢坯的轴向平面上冲压的网格构造的。从模具中取出部分挤压的坯料后，使用数值方法确定变形网格的应变率。使用转换，然后积分应变速率，可以计算出挤出区域的应变状态。结果表明，与圆锥形模具不同，余弦模具在模具进入区域不会产生反向符号应变。讨论了使用余弦压模挤压粉末金属的好处。

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