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Enhanced Hydrodynamic Lubrication in Hydrostatic Extrusion Using a Modified Die

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Proceedings of the Twenty-third International Machine Tool Design and Research Conference

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Summary

A conical die with a short, thin wedge inlet was designed to improve lubrication in hydrostatic extrusion. An analysis for the die indicates a critical billet speed above which hydrodynamic lubrication prevails. The extrusion pressure — speed variation is found to be very similar to the friction characteristic of a journal bearing. The extrusion pressure has a minimum value at a speed higher than the critical speed. At speeds above that for minimum extrusion pressure the process would be free of the stick-slip instability associated with simple conical dies at low speeds. Effects of the fluid properties, yield stress, work-hardening and the extrusion ratio are discussed. Lubrication with this die is compared with that of a simple conical die. Experiments using a modified die indicate improved lubrication in hydrostatic extrusion.

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Author information

Authors and Affiliations

  1. University of the West Indies, Trinidad, Jamaica

    S. Thiruvarudchelvan (Senior Lecturer in Mechanical Engineering)

Authors
  1. S. Thiruvarudchelvan
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Editor information

Editors and Affiliations

  1. Department of Mechanical Engineering, University of Manchester Institute of Science and Technology, Manchester, UK

    B. J. Davies (Professor of Manufacturing Technology) (Professor of Manufacturing Technology)

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© 1983 Department of Mechanical Engineering University of Manchester Institute of Science and Technology

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Thiruvarudchelvan, S. (1983). Enhanced Hydrodynamic Lubrication in Hydrostatic Extrusion Using a Modified Die. In: Davies, B.J. (eds) Proceedings of the Twenty-third International Machine Tool Design and Research Conference. Palgrave, London. https://doi.org/10.1007/978-1-349-06546-2_45

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  • DOI: https://doi.org/10.1007/978-1-349-06546-2_45

  • Publisher Name: Palgrave, London

  • Print ISBN: 978-1-349-06548-6

  • Online ISBN: 978-1-349-06546-2

  • eBook Packages: EngineeringEngineering (R0)

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