The limiting drawing ratio for plastic instability of the cup-drawing process

被引:32
作者
Leu, DK [1 ]
机构
[1] Kuang Wu Inst Technol & Commerce, Dept Mech Engn, Taipei, Taiwan
关键词
limiting drawing ratio; instability; cup-drawing;
D O I
10.1016/S0924-0136(98)00307-0
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The plastic instability of cup-drawing is usually measured by the limiting drawing ratio (LDR). A new and practically applicable equation for estimating the LDR in the cup-drawing of a cylindrical cup with a flat-nosed punch is derived using an integral technique based on the load-maximum principle for localization of the plastic flow. It is a function of the process parameters of normal anisotropy value (R) over bar, strain-hardening exponent n, friction coefficient mu, radius of the die are r(d), half die opening r(1) and yield strength sigma(y), and can clearly explore the interaction between the process parameters and the LDR in a theoretical manner. Good agreement between calculation and experiment is obtained. It is thereby possible to better understand and control cup-drawing behavior for optimum press-drawability. (C) 1999 Elsevier Science S.A. All rights reserved.
引用
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页码:168 / 176
页数:9
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