Analysis of temperature during drilling of Ti6Al4V with minimal quantity of lubricant

This paper presents a study of the temperature reached during drilling of the titanium alloy Ti6Al4V, employing class K10 carbide drills with and without hard coating (TiAlN, CrCN or TiCN). The main object of this study was to evaluate the temperature for different coated tools under the condition of application of minimal quantity of lubricant (MQL). The drilling process was chosen to evaluate the effect of the lubrication obtained with MQL, where the lubricant was applied either with an external nozzle or internally through the drill. The results show potential for drilling with MQL applied internally through the tool. For drilling with MQL applied with an external nozzle, the process was restricted to small depths and limited with reference to the requirements of the surface quality of the hole.