Title: Study on cutting forces in zero-cutting after complete stop of feed motion when face milling of alloy 718

Authors: Shinpei Tanaka; Ryutaro Tanaka; Katsuhiko Sekiya; Keiji Yamada

Addresses: Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan ' Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan ' Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan ' Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan

Abstract: The cutting forces after the feed motion started to decelerate were investigated to establish a novel method to evaluate the friction characteristic between cutting tool and work material. The cutting force component in cutting direction Ft and that in the direction at right angle to cutting direction Fn decreased with the deceleration of feed speed and then showed almost constant in zero-cutting. In zero-cutting, the repeatability of wave form of cutting force was high and visually chips were not found. Because the contact was in the friction state without chip formation, the average cutting force rate Ft′/Fn′ in zero-cutting could be defined as coefficient of friction. Therefore, a user can easily evaluate the friction characteristic of tool-work material and set appropriate cutting conditions. Comparing the average cutting force rate in zero-cutting of alloy 718, the emulsion 10% caused smaller average cutting force rate than dry condition.

Keywords: intermittent cutting; feed motion; uncut chip thickness; cutting force; zero-cutting; elastic deformation; friction characteristic; coefficient of friction.

DOI: 10.1504/IJAT.2023.130841

International Journal of Abrasive Technology, 2023 Vol.11 No.3, pp.175 - 183

Received: 20 Jun 2022
Accepted: 05 Oct 2022
Published online: 12 May 2023 *