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TECHNICAL BRIEFS

Non-Free Cutting and Its Degree of Freedom Confinement

[+] Author and Article Information
H. Shi, X. Wang

School of Mechanical Engineering, Beijing Institute of Technology, Beijing, P.R. China 100081

Tao Lu

School of Mechanical Science & Engineering, Huazhong University of Science & Technology, Wuhan, Hubei, P.R. CHINA, 430074

J. Manuf. Sci. Eng 121(1), 150-153 (Feb 01, 1999) (4 pages) doi:10.1115/1.2830568 History: Received May 01, 1996; Revised October 01, 1997; Online January 17, 2008

Abstract

Plunge-turning processes of round-edged cutters is analyzed and its cutting force modeled in the light of a general theory of non-free cutting developed by the authors. In this study the whole cutting tool is treated as a combination of a series of Elementary Cutting Tools (ECTs). Due to the non-linearity of chip-ejection interference among all the ECTs the total cutting force of the whole cutter, however, cannot be calculated by simply superposing the incremental cutting forces generated by all the ECTs. A Non-Linear Synthesis Method (NLSM) is therefore suggested for modeling this non-free cutting force. The main feature of the method is that the chip-ejection interference is under consideration and modeled on the basis of the Principle of Minimum Energy (PME). Good agreement between the predicted and measured main cutting forces is identified. Furthermore, a Coefficient of Non-Free Cutting (CNFC) is applied to quantitatively indicate the strength of chip-ejection interference among the ECTs and the degree of freedom confinement of the cutting process.

Copyright © 1999 by The American Society of Mechanical Engineers
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