Modeling of Drill Temperature and Thermal Stress in Drilling of Titanium Alloys

Abstract

The critical technical information for the drill design and process parameter selection for drilling of Ti alloys is the spatial and temporal distributions of temperature of the drill. The high and concentrated temperature at the drill tip softens the drill material and promotes rapid diffusion wear, chemical reaction, and drill wear and edge chipping. The drill temperature is studied experimentally or numerically in this chapter. Because the heat generation rate and drill temperature are difficult to measure directly during drilling, numerical modeling is a necessary tool to predict the temperature inside the drill. The inverse heat transfer method with the combination of experimental measurement and numerical modeling is presented in this chapter to find the drill temperature during drilling.