工作機械の共振周波数を変更する技術の開発

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In the 21st century, various kinds of materials are being used for high quality, and high confidence in various purposes. The establishments of optimum cutting condition for those materials are also being demanded for high productivity. On the other side, there exist many resonance frequencies for a machine tool. When a compulsory vibration of a machine tool congregates to the resonance frequency, extremely high vibration occurs on the machine tool structure and the geometrical accuracy of the work-piece also becomes lowered. For this condition, other cutting condition must be selected outside the range of the resonance frequency. Therefore, the technique for controlling resonance frequency on a machine tool was developed for establishment of optimum cutting condition. Resonance frequency can be controlled by changing stiffness and appearance density of a machine tool. In particularly, resonance frequency under 100Hz has very large influence on the vibration of the machine and thus for the accuracy of the product. Therefore, simple and rational reinforced structure for high stiffness, and lightweight structure for low density were considered for controlling of resonance frequencies less than 100Hz. Injection of water was used for creating high density in a machine tool structure. Moreover, the positions of supports under the machine tool were also changed for controlling vibration. The experiments were done using the techniques mentioned above. Form the results, it is concluded that, (1) The technique for controlling resonance frequency on a machine tool was effective for cutting with optimum machining condition, (2) Reinforced structure, lightweight structure, injection of water and changing position of supports were very effective for controlling resonance frequency.

工作機械の共振周波数を変更する技術の開発

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