On the static coefficient of friction in sheet metal forming

• Autorzy: Steinmetz G. , Felder E. , Reinhardt A.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

friction law; static friction; press forming; simulation

PL

tarcie; tłoczenie; symulacja

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2002
• Tom: Vol. 7, no 3
• Strony: 1001--1013
• Opis fizyczny: Bibliogr. 3 poz., rys., wykr.

Twórcy

autor

Steinmetz G.

• Centre de Mise en Forme des Matériaux, Ecole des Mines de Paris BP 207, 06904 Sophia Antipolis, FRANCE

autor

Felder E.

• Centre de Mise en Forme des Matériaux, Ecole des Mines de Paris BP 207, 06904 Sophia Antipolis, FRANCE

autor

Reinhardt A.

• P.S.A. Peugeot Citroen, Route de Gisy 78943 Velizy-Villacoublay Cedex, FRANCE

Bibliografia

• [1] Devine I. (1996): Apport de la tribometrie et des essais sur presse pilote pour la simulation numerique de I'emboutissage des tóles d'acier nues et revetue de zinc pur. - These de Doctorat, Ecole des Mines de Paris.
• [2] Benabdallah H. and Fisa B. (1989): Static friction coefficient of some thermoplastics. - Proceedings of ANTEC ‘89, May 1-4, 1989, New York, pp.1055-1058.
• [3] Monfort G. and Defoumy J. (1990): Surface Roughness and Friction in Press Forming. - Liege: Centre de Recherche en Metallurgie.