Influence of thinning design on cutting process in drilling
Shoichi TAMURA, Tomohiro KIKUCHI, Katsufumi INAZAWA, Takashi MATSUMURA
Abstract. To ensure high product quality and production efficiency of holes, the drilling tools must be appropriately designed. The thinning design of the drill is crucial for controlling the chip formation and the cutting force in drilling, which significantly affects the hole accuracy and the production time. The chip formation and cutting force are discussed in drilling with X-type and R-type thinning drills. Chips on the thinning and the lip flow independently in drilling with an X-type thinning drill, whereas, a single chip is observed in drilling with the R-type thinning drill. The chip flow direction is analyzed with an energy-based force model. The chip flow directions on the thinning and the lip depend on changes in the cutting area as the cutter travels, because the chip formations on the thinning and the lip interact with each other in drilling with the R-type thinning drill. While the chips on the thinning and the lip flow independently in constant directions during drilling with the X-type thinning drill.
Keywords
Drilling, Chip Formation, Cutting Force, Chip Flow Direction
Published online 5/7/2025, 8 pages
Copyright © 2025 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: Shoichi TAMURA, Tomohiro KIKUCHI, Katsufumi INAZAWA, Takashi MATSUMURA, Influence of thinning design on cutting process in drilling, Materials Research Proceedings, Vol. 54, pp 1729-1736, 2025
DOI: https://doi.org/10.21741/9781644903599-186
The article was published as article 186 of the book Material Forming
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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