Article | REF: BM7536 V1

Deep-drawing tribology

Author: Éric FELDER

Publication date: March 10, 2011

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ABSTRACT

This article successively presents the principal methods of characterization sheets before and after friction, the microscopic mechanisms responsible for the sheet/tool interactions (microplastic deformation of the plate, micro-hydrodynamic effects, chemical reactivity of lubricant additives),the restraining effects of the draw-beads and the various models used for the numerical simulation of forming.

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AUTHOR

  • Éric FELDER: Ingénieur civil des Mines de Paris, Docteur ès sciences physiques, Maître de recherches à l'École des Mines de Paris, Groupe "Surfaces et Tribologie" du CEMEF

 INTRODUCTION

This article is a continuation of [BM7535] , which sets out the issues and general framework of the problem of friction in stamping: material properties, sheet deformation modes and associated contact conditions, and the main test methods for studying and measuring friction. This article deals successively with the following points:

  • the main methods for characterizing sheet metal before and after friction, which allows us to begin to define the main characteristics of sheet metal friction;

  • microscopic mechanisms responsible for sheet metal/tool interactions (microplastic deformation of the sheet metal, micro-hydrodynamic and hydrodynamic effects, chemical reactivity of lubricant additives);

  • the operation of the retaining rings used to control the flow of metal under the hold-down;

  • the various models, more or less sophisticated, used to take friction into account in the numerical simulation of stamping operations.

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Stamping tribology