Aerodynamic Noise Radiation from a Circular Cutting Tool. Influence of an Attack Angle of a Slit Tooth on Aerodynamic Noise.

Abstract

The aerodynamic noise from a circular cutting tool was significantly reduced by using a slit tooth. By making a slit longitudinally through the tooth running parallel with a principal stream, a self-jet is caused by a slit to under the stream. A reason for the aerodynamic noise reduction is that the vortices generated behind a tooth are controlled by the self-jet. The slit tooth leads to good results in order that a circular cutting tool itself may have an effect the aerodynamic noise reduction. This paper presents the results of an investigation into the influence of the attack angle of the slit tooth on aerodynamic noise reduction by using a columnar slit tooth model. From the experimental results, the influence of the attack angle on the noise reduction quantity, the attenuation coefficient of sound pressure and the spectrum is clarified.