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Proceedings of the Twenty-First International Machine Tool Design and Research Conference pp 223–229Cite as

Producing Superplastic Tubular Tee-Joints by Thermoforming

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Summary

A new process to produce tubular tee-joints from straight lengths of superplastic tubes is presented. The process is achieved by holding one straight superplastic tube inside a split-die composed of two cylindrical cavities perpendicular to each other; thus making-up the required tee-shaped cavity. By applying pressure inside the superplastic tube at the appropriate temperature, only the lateral bulging of a small portion of the tube wall is allowed. After trimming the bulged zone, the tee-joint is realised by butt-welding of a second straight tube along the trimmed contour.

A simple theoretical analysis to predict thickness distribution in the bulged zone as wellas the forming pressures and times for various superplastic material behaviours is presented. Experiments of forming tee-joints from superplastic lead-tin alloy gave results only in fair agreement with the theoretical predictions.

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Author information

Authors and Affiliations

  1. Department of Mechanical Design and Production Engineering, Cairo University, Egypt

    A. R. Ragab

Authors
  1. A. R. Ragab
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Editor information

Editors and Affiliations

  1. University College of Swansea, UK

    J. M. Alexander (Professor and Head of Department of Mechanical Engineering, Chairman of School of Engineering) (Professor and Head of Department of Mechanical Engineering, Chairman of School of Engineering)

Copyright information

© 1981 The Department of Mechanical Engineering, University College of Swansea

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Ragab, A.R. (1981). Producing Superplastic Tubular Tee-Joints by Thermoforming. In: Alexander, J.M. (eds) Proceedings of the Twenty-First International Machine Tool Design and Research Conference. Palgrave, London. https://doi.org/10.1007/978-1-349-05861-7_29

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  • DOI: https://doi.org/10.1007/978-1-349-05861-7_29

  • Publisher Name: Palgrave, London

  • Print ISBN: 978-1-349-05863-1

  • Online ISBN: 978-1-349-05861-7

  • eBook Packages: EngineeringEngineering (R0)

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