A Cobalt Diffusion Based Model for Predicting Crater Wear of Carbide Tools in Machining Titanium Alloys
Author:
Hua Jiang1, Shivpuri Rajiv1
Affiliation:
1. 1971 Neil Avenue, Room 210, Industrial, Welding and Systems Engineering, The Ohio State University, Columbus, Ohio 43210
Abstract
In machining titanium alloys with cemented carbide cutting tools, crater wear is the predominant wear mechanism influencing tool life and productivity. An analytical wear model that relates crater wear rate to thermally driven cobalt diffusion from cutting tool into the titanium chip is proposed in this paper. This cobalt diffusion is a function of cobalt mole fraction, diffusion coeficient, interface temperature and chip velocity. The wear analysis includes theoretical modeling of the transport-diffusion process, and obtaining tool–chip interface conditions by a nonisothermal visco-plastic finite element method (FEM) model of the cutting process. Comparison of predicted crater wear rate with experimental results from published literature and from high speed turning with WC/Co inserts shows good agreement for different cutting speeds and feed rate. It is seen that wear rates are independent of cutting time.
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference17 articles.
1. Molinari, A., and Nouari, M., 2002, “Modeling of Tool Wear by Diffusion in Metal Cutting,” Wear, 252, pp. 135–149. 2. Trent, E. M., and Wright, P. K., 1991, Metal Cutting, 3rd ed., Butterworth-Heinemann, Washington, DC. 3. Ezugwu, E. O., and Wang, Z. M., 1997, “Titanium Alloy and Their Machinability—A Review,” J. Mater. Process. Technol., 68, pp. 262–274. 4. Hua, J., 2002, Chip Mechanics and Its Influence on Chip Segmentation and Tool Wear, Ph.D. Dissertation, The Ohio State University. 5. Cook, N. H., and Nayak, P. N., 1966, “The Thermal Mechanics of Tool Wear,” ASME J. Eng. Ind., 88(1), pp. 93–100.
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