Effect of feed pitch on formability in tube expansion using ball spin forming

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Effect of feed pitch on formability in tube expansion using ball spin forming

OGURI Soma, KAJIKAWA Shohei, KUBOKI Takashi

Abstract. This study proposes a simple and localized forming method using a train of four balls in a tube-hoop direction that expands tube diameter at arbitrary axial positions. The balls travel in the tube direction while rotating around the tube axis. Compared with conventional methods, the expansion mechanism is compact as only one input-rotational drive forms taper and parallel sections. This paper particularly focuses on the effect of feed pitch for the parallel section forming and the ball gap to the cylinder on dimensional precision. An outer cylinder was used for securing the outer diameter as the inner surface of the cylinder can suppress the overshoot of the tube diameter. The experimental results verified the effect of the cylinder. When the ball gap to the cylinder was small enough to push the tube wall to the cylinder-inner surface, the tube diameter was stable at the target value regardless of the feed pitch for the parallel section forming. The tube thickness t decreased to 0.5 mm with increase of the clearance between the balls and the cylinder-inner surface just as designed. However, the thickness could not be less than 0.5 mm.

Keywords
Tube Forming, Expansion, Ball Spin Forming, Spinning, Aluminum

Published online 9/15/2024, 7 pages
Copyright © 2024 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: OGURI Soma, KAJIKAWA Shohei, KUBOKI Takashi, Effect of feed pitch on formability in tube expansion using ball spin forming, Materials Research Proceedings, Vol. 44, pp 656-662, 2024

DOI: https://doi.org/10.21741/9781644903254-70

The article was published as article 70 of the book Metal Forming 2024

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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