The Electro-Hydraulic Bending Moment Servo Vibration Damper

Abstract In the metal cutting process, selfexcited chatter sometimes may take place and it may cause bad effects on the workpiece surface, on machine life and on the cutter. It is generated, first of all, by the extremely resilient dynamic stiffness in the structure of the machine tool; this is especially true when a boring bar is long and slender. As the result, an additional damping unit is highly desirable to improve the cutting stability. This paper introduces the idea and theoretical analysis of a boring bar provided with a bending moment servo vibration damper. Chang's optimum control theory is applied to the controller because the damping force must be most effectively used. Then, the damper is applied to stablize the cutting chatter with good results.