Chatter control and stability analysis in cantilever boring bar using FEA methods

Abstract

Chatter is a self-excited vibration that occurs during any machining process. Chatter sensations were stir up during boring process due to cantilever shape of boring bars. These vibrations amplify the temperature of the boring tool additional which ultimately increases the tool wear. In this project a proper damping material is fixed on the boring bar, used to measure temperature for various positioning of the damper, different levels of speed, feed rate and depth of cut in the machining test. The main intention of the work is to design damped tool holder for existing machine tools with low cost. The enhancement of the damping ability of boring tool and control the chatter were attempted using different types of dampers such as Copper and Brass. These materials comprise high density and so that inertia mass of the boring tool is improved to suppress the chatter of boring operations. Modal analysis of boring bar is done by using ANSYS software in this current investigation. Modal examination is used to determine the natural frequencies and mode shapes of a structure. The natural frequencies and mode shapes are incredibly important factor in the design of a structure for vibrant loading conditions.