| Summary: | 碩士 === 逢甲大學 === 自動控制工程所 === 97 === Chatter has counter effects in cutting process so that we desired to solve it. The traditional solutions in the workshop are enhancing the workpiece rigidity or reducing the depth of cut. However, these methods will also reduce the material removal rate.
In this study, the chatter suppression for the turning of slender workpieces is investigated. A tool holder driven by a piezoelectric actuator was designed for suppressing chatter by using active control methods. It is noted that, when the displacement sensor makes measurements close to the cutting point, the measurements can be easily corrupted by cutting chips and coolants. Therefore, a novel control structure is proposed for avoiding the difficulty.
The designed controller is easy to use in the workshop, since there is only one parameter of the controller has to be tuned for making a trade-off between the control performance and the actuator saturation. It is also proved by the proposed theory that the controller possesses the ability to suppress chatter at any cutting points.
The derived theoretical results are verified through computer simulations. A table lathe was retrofitted for carrying out the turning experiments using the piezo-actuated tool holder. Under the same cutting conditions, the experimental results are compared for conventional tool holder, uncontrolled piezo-actuated tool holder and the controlled piezo-actuated tool holder. The experimental results have indicated that the proposed controller can suppress chatter effectively.
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