Abstract
PID control strategies are widely used for numerically controlled machine tools. A lot of methods have been developed to tune PID controllers. However, today, no universal industrial tuning method is commonly used. Therefore, the aim of this paper is to propose a generic tuning method based on dynamic model of machine tool structure. Thus, the obtained tuning gains are adapted to the dynamic behavior of the machine. The machine tool and dynamic model parameters are identified to guarantee the reliability of the method for task kinematic loads. Hence, the methodology is universal, repeatable, and can be processed without an excessive immobilization of the machine, according to industrial needs. The study is illustrated with a five-axis machine tool, HURON KX15. The proposed methodology is validated with a ballbar test and a design simulator. This method is a first step to define a tuning method adapted to the machine behaviors and task load. We focus here on the dynamic behaviors of machine tool structure.
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