Evaluation of the Influence of Contact between Tool and Workpiece on the Machine Tool Vibration Characteristics based on Detected Contacting Condition

Abstract

Contact between the tool and the workpiece during machining has a significant effect on the vibration characteristics of the machine tools. In this study, contacting rate is defined as the contact time per unit time based on the detected contact between the tool and workpiece during the excitation tests, and relationship between the contacting rate and vibration characteristics is investigated. As a result, it was confirmed that the natural frequency increased significantly when the contacting rate was over 90%, and the vibration damping increased significantly when the contacting rate was in the range of 0-10%.