Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 04, 2019 - October 06, 2019
During the cutting operations, it is expected that the vibration characteristics of the entire machine tool are influenced by the process damping and contacting stiffness due to the contact between the tool and the workpiece. In this study, excitation tests were carried out by using the motor torque command in the feed drive system. The frequency characteristics of the machine tool during the cutting operations were measured in both of with and without cutting operations and the influence of the contact between the tool and workpieces is investigated based on the changing of the frequency responses. As a result, it is confirmed that the natural frequency slightly increased during processing and the vibration amplitude decreased due to the contact. In addition, the influence of the contact between the tool and workpiece was quantitatively evaluated as the stiffness and damping coefficients by identifying the values through matching the measured and simulated frequency responses. The time domain coupled simulation between the machine tool dynamics and cutting force with the contacting effect are also carried out. As the results of the simulations, it is confirmed that the contacting stiffness and process damping have an effect to suppress the chatter during the cutting operations.
