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Application of bending under tension test to determine the effect of tool radius and the contact pressure on the coefficient of friction in sheet metal forming

journal contribution
posted on 2005-01-01, 00:00 authored by N Nanayakkara, Georgina Kelly, Peter HodgsonPeter Hodgson
To quantify the frictional behaviour in sheet forming operations, several laboratory experiments which simulate the real forming conditions are performed. The Bending Under Tension Test is one such experiment which is often used to represent the frictional flow of sheet material around a die or a punch radius. Different mathematical representations are used to determine the coefficient of friction in the Bending Under Tension Test. In general the change in the strip thickness in passing over the die radius is neglected and the radius of curvature to thickness ratio is assumed to be constant in these equations. However, the effect of roller radius, sheet thickness and the surface pressure are also omitted in some of these equations. This work quantitatively determined the effect of roller radius and the tooling pressure on the coefficient of friction. The Bending Under Tension Test was performed using rollers with different radii and also lubricants with different properties. The tool radii were found to have a direct influence in the contact pressure. The effect of roller radius on friction was considerable and it was observed that there is a clear relationship between the contact pressure and the coefficient of friction.

History

Journal

Materials forum

Volume

29

Pagination

114 - 118

Publisher

IMEA

Location

North Melbourne, Vic

ISSN

1447-6738

Language

eng

Notes

Reproduced with the specific permission of the copyright owner.

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2005, Institute of Materials Engineering Australasia Ltd

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