Noise and Vibration in Belt Grinding at Contact Wheels

In belt grinding the contact wheel type affects as well the technology of the process as the noise proceeding. To obtain a high stock removal rate the contact wheels are slotted (0° slot angle ≙ even toothing; 90°slot angle ≙ unprofiled wheel). With decreasing angle of the slotted wheels the stock removal rate, the roughness of the workpiece and the machining noise increases. The noise is of extreme tonality. The analysis of the components of the sound shows the grinding belt to be the main sound radiator. A model for the vibration excitation of the belt is developed. During idling there are two dominant excitation positions: one at the entry of the grinding belt on to the contact wheel and the second at the outlet. During grinding a third source appears in the working area. Possibilities for noise reduction are explained.