Influence of the abradant's composition on the selected physical properties in the process of front grinding of surfaces with microcrystalline sintered corundum grinding wheels

摘要

This paper presents the results of experimental research on the influence of the composition of the abradants applied in the microcrystalline sintered corundum grinding wheels at the maximum temperature obtained in the grinding zone, maximum grinding power thrust component, grinding power feed component, active grinding power, and volumetric abradant wear. Tests were conducted in the conditions of front finishing grinding of flat surfaces of the objects made of corrosion-resistant steel, with austenitic structure. In our tests, we used a mini-grinder for flat surfaces, controlled by a CNC system, shank mounted grinding wheels made of mixed electrocorundum-cubitron abradant, a piezoelectric dynamometer, a thermal camera, a digital power analyzer, and a laser gauge. The test results were subjected to statistical and substantive analyses. It was found that, together with a proportional increase of the microcrystalline sintered corundum content in the grinding wheel's material, the values of the indicated physical properties displayed a decreasing tendency that could be determined by the trend functions, in the form of second-degree polynomials, without interaction. It was further found that such changes in the abradant composition significantly influenced the changes of the values of selected physical properties, and the test results well-approximated by the test object functions, in the form of third-degree polynomials, without interaction. The test object functions were characterized by the occurrence of local extremes whose locations indicated that it was the most beneficial to operate grinding wheels with the abradant content belonging to the range of 7CB-9CB, in the assumed testing conditions.