Modeling of temperature distribution in drilling of titanium

Understanding the temperature distribution in drilling tool and workpiece is crucial for enhancing the drill performance and the process efficiency. However, a complete analysis of the same is extremely challenging, particularly for difficult-to-machine materials such as titanium. The existing analytical and finite element analysis techniques normally assume a sharp drill point, which is not true as the drill may wear during the process. The main objective of the present study is to develop a comprehensive finite element model for evaluating temperature distribution in the process considering a variable heat partition model and ploughing forces, by incorporating a cutting edge radius of the tool. The cutting edge of the drill is divided into a series of independent elementary cutting tools (ECT). The model presented efficiently calculates forces encountered during drilling and then evaluates temperature distribution in the drill by considering the heat partition factors adopted. An experimental procedure is developed to measure the temperature in work piece with the help of an IR camera and observed results are successfully validated. The simulation results obtained are in agreement with the prior studies on tool temperature distribution, and the experimentally measured work piece temperatures. (C) 2017 Elsevier Ltd. All rights reserved.