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1 International Journal of Applied Mechanics and Engineering

1 2002

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On the static coefficient of friction in sheet metal forming

Steinmetz G., Felder E., Reinhardt A.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, no 3

1001-1013

In a sheet metal working process, products or half products are manufactured from a flat sheet of metal. The friction between the material and the tools influences the process by modifying the strain distribution. From a numerical point of view, a constant Coulomb coefficient is commonly used in FEM simulations to model the frictional behaviour of contacting solids. However, this coefficient varies in time and space with many parameters. We present here a new control of the flat die test friction device which allows the determination of the static coefficient of friction. Experimental results are given for hot dipped galvanised steel sheets. We also propose a local friction law based partly on experimental results. FEM simulations are carried out for an axisymmetric stamping operation using the defined friction law. We compare the computed sheet thickness related to a local or global coefficient of friction. A localised influence of the local model is found on the punch nose that underlines the higher friction coefficient in this zone.