On the Method to Determine the Stiffness of Grinding Machines

Abstract

The effects of stiffness upon either the elastic deformation between workpiece and grinding wheel, and the stability limit of self-excited vibration have been reported in detail so far. According to these, the grinding machine should be designed as stiff as possible in order to obtain more efficient and precise grinding. On the other hand, the stiffness of grinding machine has to be settled in an appropriate value both from the performance and the economical requirements in practice. The present study proposes the method to determine the stiffness of grinding machine for a use of rough operation, standing on the point to utilize the given spindle motor power fully, without any trouble from the both behaviors written above. Namely, the minimum value of static stiffness is first analyzed which can give an appropriate amount of elastic deformation even under the full cut condition. Secondly, the minimum value of dynamic stiffness, regarding mainly to the damping ratio, is analyzed which is enough to make the operations free from the chatter vibration even under the full cut condition.