Rigid-plastic boundaries approach to the analysis of arbitrary profile dies in axisymmetric extrusion

被引：5

作者：

Huang, Guo-Ming ^{[1
,2
]}

Wang, Jang-Ping ^{[1
,2
]}

Lee, Hsien-Der ^{[1
]}

Chang, Cheng-Sung ^{[1
]}

机构：

[1] Natl Taiwan Ocean Univ, Dept Marine Engn, Chilung 20224, Taiwan

[2] Natl Taiwan Ocean Univ, Res Ctr Mat Proc & Measurement, Chilung 20224, Taiwan

来源：

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2009年 / 209卷 / 09期

关键词：

Axisymmetric extrusion; Generalized rigid-plastic boundaries; Arbitrary profile of dies; VELOCITY-FIELDS; TUBE EXTRUSION;

D O I：

10.1016/j.jmatprotec.2008.10.037

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A new theoretical model to analyze arbitrary profiles of extrusion dies is proposed in this paper. In this model, generalized rigid-plastic boundaries with optional variables are used to minimize the power by the upper-bound method. To satisfy the velocity boundary conditions at the entrance and exit, the streamline function is designed in the normal form of r(eta, z), which satisfies the flow conditions and the rigid-plastic boundaries. Four sets of profile dies (cosine, elliptic, hyperbolic, and conic) are represented with different slopes at the entrance and exit in order to illustrate this method. Experiments were conducted in order to compare the results with those of the theoretical model. It was found that the predicted load and flow patterns were in agreement with the experimental observation and the results from the literature. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：4351 / 4359

页数：9