Grain mill test for sintered microcrystalline aluminum oxide abrasive grains

摘要

In this contribution results from physical and technological testing of different sintered microcrystalline aluminum oxide abrasive grains are presented. For the physical testing an innovative test stand based on a grain mill was used. Significant differences of the measured friction forces were obtained for two different sintered microcrystalline abrasive grain types. In the technological testing vitrified grinding wheels were used for an external cylindrical profile grinding process. In the values of the grinding forces, the surface roughness and the profile deviation good correlations to the results from physical testing showed up. Also at grinding with a higher load coincident tendencies of the grinding force values were detectable. Drawing conclusions it can be declared that the results from the physical testing allow evaluating the grinding performance of the tested grain types. In further experiments the impact of different percentages of the microcrystalline grit was analyzed. It turned out that the friction forces in the physical testing increased accordingly with the percentage of microcrystalline grit while the grinding forces in the technological testing showed a nonlinear interdependency to the percentage of microcrystalline grit. To give reasons for these effects an advanced approach for modeling the interdependencies of micro-crystalline grit percentage was formulated.