AN ANALYTICAL STUDY ON THE STABILITY OF DRILLING AND REAMING

摘要

This paper presents an analytical study on the stability of drilling and reaming processes based on computer simulation. The computer simulation model is made of four parts: the force model for the cutting lips, the force model for the chisel edge, the dynamic model for the machine tool (including the cutter) and the regenerative correlation between the force and the machine tool. The first three parts are acquired from the existing models. The key to the model is the last part: the regenerative correlation between the cutting forces and the machine tool vibration. It uses a new 3D chip formation model to describe the interaction between the cutter and the workpiece. The simulation results are validated experimentally and the average error is about 10 percent. Using the new model, it is found that the stability limit is effected by five factors: the feed, the point angle of the drill / reamer, the dynamics of the machine tool, the cutting speed, and the width of the cut. A number of research issues are also proposed for the future work.