Drilling process of indexable drill bit based on Coupled Eulerian-Lagrangian method: A simulation study

42CrMo steel has the characteristics of high strength, high wear resistance, high impact resistance, and fatigue resistance. Therefore, drilling 42CrMo steel has always been a challenging task. The indexable drill bit has the advantages of high processing efficiency and low processing cost and has been widely used in the field of aerospace hole processing. To better understand the machining mechanism of the indexable drill bit, this paper uses the Coupled Eulerian-Lagrangian method (CEL) to simulate the three-dimensional drilling model for the first time. The simulation results of the drilling force obtained by the CEL method and Lagrangian method are compared with the experimental results. It is verified that the CEL method is easy to converge and can avoid the problem of program interruption caused by mesh distortion, and the CEL simulation value is more consistent with the actual value. Secondly, the simulation results of cutting force and blade cutting edge node temperature under different process parameters are extracted. The variation of time domain cutting force, frequency domain cutting force and tool temperature with process parameters are obtained. This study provides a new method for the prediction of cutting performance and the optimization of process parameters of indexable drills.