Vibration-Damped Tool Holders in Industrial Robotic Machining Systems

Since the introduction of automation systems has begun to be applied to most industries with the development of technology, the utilization of industrial robots is increasing every year. However, the processing field a such as milling and Rough Cutting processing process occurs vibration from large processing load. Since industrial robots basically have low stiffness, they are vulnerable to vibration generated from processing loads when processing. In this paper, multi-axis active spindle holder of high stiffness was developed to improve precision and quality deterioration due to vibration generated from a processing load. If an active spindle holder of high stiffness is applied, it can increase the dynamic stiffness of the robot by blocking vibrations in the low-frequency range at the end effector before they are transmitted from the spindle to the robot, and as a result, it is expected to improve precision and quality. The performance evaluation of the active spindle holder manufactured based on the design was proceeded, and it was verified that the active spindle holder developed to compensate for the shortcomings of industrial robots was made with moving range and high stiffness of 200 Hz more. Furthermore, machining experiments confirmed an improvement in quality of more than 10%.