ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
A New Analytical Model for the Calculation of Mean Roll Radius in Round-oval-round Alloy Bar Rolling
Yong-gang DongWen-zhi ZhangJian-feng Song
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2006 Volume 46 Issue 10 Pages 1458-1466

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Abstract

In rod (or bar) rolling process, the roll surface is not flat for the groove on the roll, so the roll radius is not constant along the roll axis direction. In this paper, a suitable spread formula was determined to calculate the maximum spread of alloyed steel, then the surface profile of outgoing workpiece and the critical point on the contact boundary has been predicted. Furthermore, the formula of the equivalent contact section area has been proposed and the mean roll radius has been obtained.
The validity of the new model has been examined by the bar rolling experiment and the rigid-plastic FEM simulation. Compared with the existing models, the mean roll radius obtained by the new analytical model approach the experiment data more closer than other models. So, it can be used as a available reference in practice and the theoretical derivation.

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© 2006 by The Iron and Steel Institute of Japan
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