Numerical Analysis of Polygonal Deformation Phenomenon of Borehole in Reaming Process

(Taking into Account Bending Vibration of Tool)

Abstract

Reaming is a finishing process to be performed in order to improve the accuracy of the prepared hole drilled. In this process, a chatter vibration often occurs and the drilled hole is deformed in a polygonal shape. This polygonal deformation phenomenon becomes a problem, because of decrease in the precision of the hole. The generating mechanism of the polygonal deformation is considered to be a self-excited vibration caused by time delay. In the previous study, a simple analytical model is proposed in order to study the basic characteristic of the phenomenon. In this study, an analytical model taking into account bending vibration of tool is proposed in order to investigate the higher order polygonal deformation phenomenon at the entry of the hole. Also, the stability analysis is performed numerically.