Heat partition-based design of hard coatings in high-speed machining Online publication date: Thu, 26-Dec-2013
by Faraz Akbar; Paul Mativenga; Mohammad Sheikh
International Journal of Machining and Machinability of Materials (IJMMM), Vol. 14, No. 4, 2013
Abstract: In this paper, a methodology is presented to reduce the heat flux into the tool for multilayer physical vapour deposition coatings. It takes into account the thickness values of the coatings, the contact phenomena, and the thermal properties of the tool and the workpiece materials. This leads to a heat partition based design of coatings in which the heat partition from the interface to the film surface is decreased by optimising the other coating parameters. Cutting tests were conducted on AISI/SAE 4140 high-strength alloy steel using multilayer TiAlN/TiN coated tool. Cutting temperatures were measured experimentally using an infrared thermal imaging camera. The sticking and sliding regions were established using scanning electron microscopy and energy-dispersive X-ray analysis. A multilayer TiAlN/TiN coating was designed for enhanced reduction of the heat flux that goes into the tool. The approach sets a view that could be developed for a generic optimisation of coating layout.
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