Investigation into Generation Mechanism of Aerodynamic Noise Caused by a Rotating Lathe Chuck and its Reduction Remedies.

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  • 旋盤爪チャックによる空力音発生機構の検討とその低減対策
  • センバン ツメ チャック ニ ヨル クウリキオン ハッセイ キコウ ノ ケントウ ト ソノ テイゲン タイサク

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Abstract

There has been promoted further high-speed cutting with the recent background of increasing demands for shorter development period in accordance with further complex and varied user needs for products. In order to realize high speed cuting for a lathe, high speed rotation of a spindle should be necessary. In this case, reducing aerodynamic noise caused by a rotating chuck would arise as one of important problems to be solved. This paper investigates a generation mechanism of aerodynamic noise caused by a rotating chuck and also proposes remedies for reduction of aerodynamic noise. Concretely, measuring sound around a lathe machine with a three-jaws scroll chuck makes clear relationships of sound puressure level with jaw shape and rotational speed, sound directivity and resonance tube phoenomenon. Relating sound measurement results with air flow around rotating jaws reported in our previous paper, aerodynamic noise can be classified into three types ; narrow band sound depending on rotation, wide-band sound depending on turbulent air flow around jaws and narrow band sound independent of rotation. Finally, aerodynamic noise reduction remedies corresponding to a characteristic of each sound classified above are proposed. Furthermore, some experiments with jaws improved according to the proposed remedies have shown their validity.

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