Development of Curved Hole Drilling Method by EDM with Suspended Ball Electrode-Improvement in Shape Accuracy of Bending Holes Using Foil Supporting Guide

Atsushi Yamaguchi, Yuta Inaba, Sho Shiraga, Akira Okada

Research output: Contribution to journalArticlepeer-review

Abstract

Curved hole drilling method by electrical discharge machining (EDM) using suspended ball clcctrodc composed of a metal ball and flexible thin foil has been developed, and it was clarified that curved and bending holes with various curving and bending angles into various workpiccc materials could be machincd by controlling the workpiece tilting angle during the process. However, the shape accuracy of the holes is not sufficient for practical applications. In order to improve the shape accuracy of bending holes, the bending hole EDM drilling technique using a foil supporting guide was proposed in this study. In EDM drilling into aluminum alloy and carbon steel, the drilling performance was very stable. Without using the foil supporting guide, the bending angle was larger than the designed one at the bending corner. By contrast, bending holes with various bending angles, such as 10-100°, could be accurately formed by using the foil supporting guide. Furthermore, practical hole shapes, such as Z-, U-, Y- A nd T-shapes were successfully formed by combining bending and straight holes.

Original languageEnglish
Pages (from-to)461-466
Number of pages6
JournalSeimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering
Volume87
Issue number5
DOIs
Publication statusPublished - 2021

Keywords

  • Bending hole
  • Electrical discharge machining
  • Foil supporting guide
  • Suspended ball electrode

ASJC Scopus subject areas

  • Mechanical Engineering

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