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IJAT Vol.8 No.4 pp. 550-560
doi: 10.20965/ijat.2014.p0550
(2014)

Paper:

Contributions of High-Speed Cutting and High Rake Angle to the Cutting Performance of Natural Rubber

Naoki Takahashi and Jun Shinozuka

Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama, Kanagawa 240-8501, Japan

Received:
March 30, 2014
Accepted:
May 14, 2014
Published:
July 5, 2014
Keywords:
high-speed cutting, natural rubber, viscous drag, cutting force, shape accuracy
Abstract

This study investigates the contributions of high-speed cutting and a high rake angle to the improvement of the cutting performance of natural rubber. Orthogonal cutting experiments were conducted at cutting speeds ranging from 1.0 m/s to 141.1 m/s. The rake angles examined were 0°, 20° and 50°. The following results were obtained from the experiments. The cutting ratio is almost 1.0 regardless of the cutting speed and rake angle. The cutting force rises rapidly as the cutting speed increases. High-speed cutting or a high rake angle eliminates tear defects on the machined surface and reduces chipping defects at the entry edge of the workpiece. An uncut portion, however, always remains at the exit edge. The cross-sectional shape of the machined surface becomes concave. Besides, the machined surface comes into broad contact with the clearance face. These degradations in the shape accuracy arise from the large elastic distortion that occurs in the shear zone. Increasing the cutting speed improves the flatness of the machined surface. Although an analysis of the cutting mechanism reveals that the apparent stiffness of the material in the shear zone is enhanced with increasing the cutting speed, a very high cutting speed worsens the shape accuracy because of the development of shock waves. Depending on the rake angle, there is a critical cutting speed that should not be exceeded to maximize the cutting performance of natural rubber.

Cite this article as:
N. Takahashi and J. Shinozuka, “Contributions of High-Speed Cutting and High Rake Angle to the Cutting Performance of Natural Rubber,” Int. J. Automation Technol., Vol.8, No.4, pp. 550-560, 2014.
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