Effect of joint conditions on the dynamic behavior of a grinding wheel spindle

A numerical model of a grinding wheel spindle was presented to analyze the dynamic behavior of the wheel spindle with respect to joint conditions. Each joint condition of the wheel-spindle assembly was modeled to examine the dynamic behavior change due to disk mode vibration and joint conditions such as the bolt tightening forces between flange and wheel, and the taper tightening force between shaft and flange contact surface. The effects of bolt and taper coupling joint conditions on the dynamic characteristics, natural frequency and damping ratio of vibration modes, were numerically investigated using this model. Experiments were performed to measure modal parameters and compared with the numerical results. The numerical results obtained from the model agreed well, within 5%, with the experimental results. It was found that joint conditions, such as bolt tightening force and taper tightening force, have significant influence on the dynamic characteristics; the maximum natural frequency change was about 60%. It was also shown that the disk mode vibration of the wheel greatly affects the vibration mode of a wheel-spindle assembly.