Summary
A simplified method of producing smooth edged blanks in conventional presses is outlined. The method allows existing tool manufacturing techniques to readily accommodate the tooling requirements. It is the subject of patent specification no. 1367639.
The process is concerned primarily with the imposition of a stress system resulting from tooling characteristics in blanking and piercing, which allows metal flow to take place in the work-hardened region produced by conventional methods.
The influence of the tooling geometry is discussed and associated force requirements presented.
A review of the effects on component characteristics is made and a specific industrial application is discussed.
In general it is suggested that the process offers the advantages attributed to
other smooth edge blanking and piercing methods. Tool making costs, tool maintenance
costs and press capacity requirements are no more demanding than those associated with conventional piercing and blanking.
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References
PRODUCTION ENGINEERING RESEARCH ASSOCIATION Report No. 70, Finish Piercing.
STROMBERGER & THOMSEN — Smooth Hole Walls in Piercing — Machine Tool Engineering and Production News. English Translations from “Werkstatt und Betrieb” Vol. 98 No. 10 October 1965.
STANDARD HANDBOOK OF LUBRICATION ENGINEERING McGraw-Hill 1968 — Selection and Use of Lubricants in Forming of Sheet Metal pp 23–30.
PRODUCTION ENGINEERING RESEARCH ASSOCIATION — Report No. 97 — Lubrication for Blanking and Piercing Carbon Steels.
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© 1979 Department of Mechanical Engineering, University of Manchester Institute of Science and Technology
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Westwood, J.C. (1979). Smooth Edge Blanking and Piercing Using Conventional Presses. In: Davies, B.J. (eds) Proceedings of the Nineteenth International Machine Tool Design and Research Conference. Palgrave, London. https://doi.org/10.1007/978-1-349-81412-1_26
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DOI: https://doi.org/10.1007/978-1-349-81412-1_26
Publisher Name: Palgrave, London
Print ISBN: 978-1-349-81414-5
Online ISBN: 978-1-349-81412-1
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