TANTSURA Ganna, VINNICHENKO Ye., KOVALENKO A. & NAZARENKO O.
Estimation of influence of tangential cutting force on a stress state of grinding instrument
The averaging of mechanical properties of composite material was carried out by Voigt. The studies were carried out through analysis of a grinding wheel stress state for cases of application of concentrated force and a force distributed linearly along the length of a crystal.
Stress condition of a grinding tool, as a composite of abrasive grains, connected into a single structure by a special jointing material in a case of being subjected to the action of a concentrated tangential cutting force on it is determined. The averaging of mechanical properties of composite material was carried out by Voigt. Analytical expressions of parameters of a stress state of the grinding wheel for cases of application of the concentrated force, the force distributed linearly along the length of a crystal, and the stress from occurrence of the overturning moment as a result of eccentric loading, were obtained in a closed form. Application of the jointing material with higher values of the Poisson's ratio leads to higher maximum stresses in the material for unchanged other quantities. In a general case, the application of the jointing material with higher values of the Poisson's ratio leads to a decrease in endurance of the jointing material and a time decrease until the crystals fall out. Noted phenomenon can be used for timely renewal of cutting edges of the tool. Established stress distributions, analytical dependencies for their determination provide the possibility of predicting the number of load cycles of the jointing material of abrasive grains in the grinding tool before its destruction with a given cutting force. The cycle of stress changes in the material is symmetric.
Keywords: grinding tool, grinding grain, jointing material, tangential load, mechanical stresses