Investigation of Influence of Grinding-machine Spindle Unit Rigidity on the Character of Abrasive Tool Wear

Abstract

During grinding, the high accuracy and quality of the ground surface are inseparably connected with the study of the dynamic status of machine system elasticity. The investigations show the influence of the spindle unit, the most flexible part of the machine system, rigidity on the wear and cutting profile of the grinding tool.The studies of the grinding-machine spindle unit rigidity and the dependences of metal removal and consumption of diamonds in the cutting layer on grinding conditions allow establishing that with the increase in the spindle unit rigidity, the depth of grinding increases by 25% and the amount of the line feed decreases by 20%; in this case, the starting taper of the tool does change and the tool finishing part is within the limits of the tolerance zone. This provides high dimensional accuracy of the machined surface, an increase in production capacity and a decrease in the consumption of the diamond cutting layer.During the tool operation, when the rigidity of the spindle unit is increased, the generating line of the cutting edge shifts radially without changing the profile shape. As a result, the grains on the finishing part and starting taper of the tool cut off a layer of the work material regularly. Due to this, the tool is worn regularly along the entire cutting edge and its shape and profile do not get distorted.