The Theory of Plasticity Applied to Machining With Cut-Away Tools

[+] Author and Article Information
E. Usui, K. Hoshi

Hokkaido University, Hokkaido, Japan

K. Kikuchi

Muroran Institute of Technology, Hokkaido, Japan

J. Eng. Ind 86(2), 95-104 (May 01, 1964) (10 pages) doi:10.1115/1.3670497 History: Received January 21, 1963; Online December 08, 2011


Cut-away tools have a strong tendency to produce a complicated plastic flow ahead of the restricted tool-chip contact area as far as the restriction is in effect. The paper stresses the importance of the plastic field for better understanding the machining characteristics with cut-away tools. By applying the theory of ideal plasticity, the plastic field is found to be composed of one centered fan and two straight slip-line fields. The stress and velocity fields are then calculated based upon the construction of slip lines. The plastic deformation during chip-forming process is obtained analytically as a deformed pattern of originally square grids printed on the side of workpiece. The analytical pattern is verified to be in good agreement with the pattern actually produced in experiments. A quantitative analysis for variation of coefficient of friction on rake face with the artificial reduction of tool-chip contact area is proposed, in comparison with experimental results. The experimental results appear to support the analysis.

Copyright © 1964 by ASME
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