Chattering Phenomena as the Criterion of Redress Life of Grinding Wheel: A Study on the Establishment of Optimum Operational Condition in Precision Grinding of Hardened Steel

Summary

The occurrence of chatter in the grinding process is adopted as one of the most important criteria of the wheel life. The chattering phenomena are examined experimentally by using many kinds of measurements such as grinding force, roughness of ground surface, profile of wheel face, etc., as well as mechanical vibration.

The generation of chattering is recognized as taking place in the region where the static component of normal grinding force saturates after increasing the grinding force gradually. This means that the resonant state of the vibration system of grinding is kept in that region of saturation because the coupling stiffness between wheel and workpiece is settled at a constant value.

The sub-microscopic conditions of the wheel face are observed. It is verified that there exists an optimum grinding condition with regard to the production rate. The saturation of grinding force appears lastly through the proper combination of attrition wear and fracture of cutting edges under that condition. It is confirmed that such a minute profile of the ground surface as shapes of valleys in a profilograph changes in connection with the grinding force as the grinding progresses.