Suppression of Wheel Regenerative Grinding Vibration by Alternating Wheel Speed

To understand the mechanism of vibration suppression effected by alternating the running speed of the grinding wheel in cylindrical plunge grinding operation, theoretical and experimental analyses have been undertaken. Based on the growing process of the vibration observed in grinding tests at constant wheel speed, and referring to the previously proposed theoretical model, the onset and the growth of the grinding vibration are discussed in the present study. Theoretical model predicts that the method of alternating the wheel speed will be associated with two different frequencies of vibration that will appear during the periods of grinding at two pre-selected wheel speeds respectively, and they will be caused by the development of two corresponding series of asperities formed as the result of wheel wear around its surface. Above prediction has been confirmed by the cylindrical plunge grinding experiments. Grinding vibration measured for different ranges of wheel speed variation indicates that the greater range up to ±10 % around the average speed consistently reduces the growth of vibration. Another series of experiments revealed that workpiece surfaces are finished by the alternating wheel speed to better quality in terms of the variation in light reflectivity around the circumference.