Affiliation:
1. Department of Mechanical Engineering, The University of British Columbia, Vancouver, BC, Canada V6T 1Z4
Abstract
Chamfered cutting tools are used in high speed machining of hardened steels due to their wedge strength. An analytic model is proposed to investigate the influence of chamfer angle and cutting conditions on the cutting forces and temperature. The model is based on the tool geometry, cutting conditions, steady state temperature in the shear and chip-rake face contact zones, strain, strain rate, and the corresponding flow stress of the work material. With the aid of a slip line field model, the cutting and friction energy in the primary, secondary and chamfer zones are evaluated. By applying the minimum energy principle to total energy, the shear angle in the primary deformation zone is estimated. The corresponding shear strain, strain rate and flow stresses are identified. The model leads to the prediction of cutting forces and temperature produced in three deformation zones. The model is experimentally verified by high-speed orthogonal cutting tests applied to P20 mold steel using ISO S10 carbide and CBN cutting tools. It is shown that the analytic model is quite useful in selecting optimal chamfer angle and cutting speed which gives the minimum tool wear and relatively lower cutting forces. [S1087-1357(00)00204-5]
Subject
Industrial and Manufacturing Engineering,Computer Science Applications,Mechanical Engineering,Control and Systems Engineering
Reference21 articles.
1. Merchant, M. E. , 1945, “Mechanics of the Metal Cutting Process, II. Plasticity Conditions in Orthogonal Cutting,” J. Appl. Phys., 16, pp. 318–324.
2. Lee, E. H., and Shaffer, B. W., 1951, “The Theory of Plasticity Applied to A Problem of Machining,” Trans. ASME, J. Appl. Mech., 18, pp. 405–413.
3. Oxley, P. L. B., 1989, Mechanics of Machining—An Analytical Approach to Assessing Machinability, Ellis Horwood Limited.
4. Oxley, P. L. B., and Hastings, W. F., 1977, “Predicting the Strain Rate in the Zone of Intense Shear in Which the Chip is Formed in Machining From the Dynamic Flow Stress Properties of the Work Material and the Cutting Conditions,” Proceedings of the Royal Society of London, Vol. A356, pp. 395–410.
5. Hitomi, K. , 1961, “Fundamental Machinability Research in Japan,” J. Eng. Ind., 83 pp. 531–544.
Cited by
67 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献