Numerical study of free vibration behaviour of filled tool holder using epoxy-granite

This paper presents a computer simulation focused on identifying the effect of cutting tool construction and damping material on its natural frequency. To this end, nine cutting tools with different cross-section of tool holder filled up with high damping material were presented. The free vibration analysis performed by ANSYS Workbench indicated that vibration amplitude decreases in cutting tools with epoxy-granite compared to that of conventional cutting tool. The relationship between the first and second natural frequencies with the length and diameter of the absorber chamber reveals that increase in diameter and length will reduce the natural frequency. Moreover, Multiple Regression Technique (MRT) was used to present a new equation for calculating the first natural frequency of filled tool holder via the dimensions of epoxy-granite cell. Next, various cases of filled tool holder were analysed based on Taguchi method. The results of the Taguchi sensitivity analysis showed the effect of length parameter (58%) on the natural frequency is more than the effect of diameter parameter (42%) on it. Moreover, it is also concluded that the natural frequency is more effectively reduced if the part between tool head and first tightening screw is filled with an increased volume of the absorbent.