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Production Engineering

, Volume 8, Issue 5, pp 577–584 | Cite as

Determination of friction coefficients in deep drawing by modification of Siebel’s formula for calculation of ideal drawing force

  • Martin Grüner
  • Marion Merklein
Production Process

Abstract

The numerical simulation of deep drawing processes is state of the art. Beside flow curves and yield locus, friction coefficients for blank-die contact are the most important, but often not exactly known, input parameters. This paper deals with the topic to calculate friction coefficients from Siebel’s formula for calculation of ideal maximum drawing force. Different modifications for special cases e.g. displaced blankholder or big die clearances are taken into account. The modified Siebel formula is used to determine friction coefficients for elevated temperatures up to 600 °C and different dry lubes. The calculated values for the friction coefficients are compared to values identified in numerical simulation.

Keywords

Production process Friction coefficient Elevated temperatures 

Notes

Acknowledgments

The presented results were achieved by investigations within the research Project DFG–ME2043/9–4. “Warm forming of high strength steel using granular material as a hydroforming medium” which is sponsored by the German Research Foundation (DFG).

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Copyright information

© German Academic Society for Production Engineering (WGP) 2014

Authors and Affiliations

  1. 1.Department Mechanical Engineering, Institute of Manufacturing TechnologyFriedrich-Alexander-Universität Erlangen-NürnbergErlangenGermany

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