Simulation of drilling process for control of burr formation

The cutting force and the chip flow direction are simulated to reduce burr formation at the backside of the machined plate in an analytical model based on the minimum cutting energy. The curved lips drill is discussed to reduce the thrust and increase the chip flow angle with the orientation and the curvature. The counterclockwise orientation is effective to reduce the thrust and control the chip flow with the small curvature. A curved lip drill is designed with a large radial rake angle at the end of the lips based on the cutting simulation.