| Summary: | 碩士 === 國立臺北科技大學 === 機電整合研究所 === 104 === Although advances in science and technology, the machine tools manufacturing still focus on the improvement of machining precision and efficiency today. However, the whole machine is a complicated structural system. With the study objective of improving the stiffness and damping of linear guideway, the system develops a rigid auxiliary slider that can be installed on the existing linear guideway to provide additional stiffness, and can further improve the cutting vibration generated during the machining process.
Our laboratory has developed an auxiliary slider with passive stiffness successfully (No. I). Moreover, it has completed practical machine installation and test in the study, including the static stiffness test of the actual machine, fast-feeding vibration test, and cutting test. The measurement results are analyzed by the method of signal processing. It verifies the auxiliary sliderⅠ can achieve the effect of vibration suppression on the actual machine. Moreover, it summarizes the design objectives of new slider based on the discussion results, include: (1) Flexible and adjustable installation, (2) Adjustable stiffness section (Applicable to various model types), (3) Load compensation mechanism. Furthermore, it develops a new type auxiliary slider by taking the adjustable stiffness auxiliary slider (No. III) as the prototype.
This study examine five design cases and select the best one as a preliminary verification the function of auxiliary slider IV through CAE simulation, and completes sampling of auxiliary slider IV. Moreover, it inspects the key dimensions before conducting the related functional tests, so as to make it consistent with that required in the original design. Through MTS monomer static stiffness experiment and load compensation experiment, it verifies the auxiliary slider IV developed in the study has 3 stages of adjustable stiffness section. In addition, the piezoelectric actuator is driven by control of different voltages to achieve proactive inching load compensation function. This makes the effect of stiffness auxiliary slider get less the restrictions of the weight of workpiece and the load of cutting force.This study also provide the verification for automatic compensation in the future.
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