SUNConferences, Southern African Institute of Industrial Engineering 2013

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To Coat or not to Coat when Cutting it Cool with Titanium Alloys
Anton Alexander Enever, Nico Francois Treurnicht

Last modified: 2013-06-18

Abstract


The use of titanium alloys is increasing in several specialised applications such as medical, automotive, but especially in the aerospace industry. This in turn increases the demand for titanium alloy components and inevitably puts pressure on production rates. To increase production rates, cutting speeds and feed rates need to increase. The thermal conductivity of titanium alloys is low compared to comparable metals such as steel and aluminium, leading to concentration of heat in the cutting zone and hence higher temperatures. The logical conclusion that cooling is essential for titanium alloy machining, is supported by the bulk of the literature in this field.

Another possibility to increase the production rates of titanium alloys is to use coated tools for the machining. Some previous studies, however, show that there is minimal or no economic benefit using coated tools after the increased cost of the coated tools has been discounted. These studies have mostly been done with conventional flood cooling, while new developments with high pressure through spindle cooling proved to be effective. Coating technologies are at the same time a fast developing technology.

This study investigates high pressure cooling and coating technologies simultaneously for the machining of Ti-6Al-4V.

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