NUMERICAL STUDY ON DYNAMIC BEHAVIOR OF BORING BAR OF UNEQUAL BENDING STIFFNESS
Journal Title: Proceedings in Manufacturing Systems - Year 2012, Vol 7, Issue 2
Abstract
The effects of tool tip orientation with respect to principal axis of non circular boring bar, on the stability of self-excited regenerative chatter vibration are numerically and experimentally investigated. The principal formulation of the problem is based on the finite element method and the resolution of the differential equations governing the vibratory movement of the boring bar use “Theta Wilson” method. The superposition of relative displacements of the cutting tool tip, obtained for various orientations of the tool with respect to their principal axes, in curves of lissajoux characterizes the elliptic trajectory of the cutting tool tip while machining. It is clearly shown that there exist a couple of frequency and orientation angle of the boring bar making it possible to delay considerably the appearance of the phenomenon of chattering, there also existed other couples of angles and dangerous frequencies corresponding to the proper modes of the bar. Results of the numerical simulation of the boring bar motion are successfully confirmed by experimental investigations.
Authors and Affiliations
A. Bourdim
Keywords
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