Some Observations on the Mechanics of Orthogonal Cutting of Delrin and Zytel Plastics

[+] Author and Article Information
U. M. Rao, J. D. Cumming, E. G. Thomsen

University of California, Berkeley, Calif.

J. Eng. Ind 86(2), 117-121 (May 01, 1964) (5 pages) doi:10.1115/1.3670466 History: Received January 25, 1963; Online December 08, 2011


An investigation of the mechanics of orthogonal cutting on an acetal resin (Delrin 150x) plastic and a nylon resin (Zytel 101) plastic was carried out. The specimens were in the form of tubes and the rake angles and feeds were varied from −10 to +40 deg and 0.003 to 0.0115 ipr, respectively. It was found that a shear-plane type of analysis and the minimum-energy principle at low tool chip contact friction are applicable. It was found further that some of the reasons for the formation of discontinuous chips for Delrin 150x were excessive strains and induction of tensile stresses into the zone ahead of the tool. By the use of the minimum-energy principle and a constant dynamic shear stress, which appears to correlate with static properties, it was possible to predict the tool forces for Zytel 101 to a satisfactory degree of accuracy.

Copyright © 1964 by ASME
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