Authors: KorotkovA.N., KorotkovV.A., MinkinE.M.

Title of the article: The influence of the shape and grain orientation on the performance indicators of grinding wheels with a flat grinding

Year: 2018, Issue: 3, Pages: 56-61

Branch of knowledge: Mechanical engineering and machine science

Index UDK: 621.922.3

DOI: 10.26730/1999-4125-2018-3-56-61

Abstract: Grinding tools do not fully use their potential capabilities. The main reason for this drawback is that the grains that are the cutting elements of these tools have an arbitrary shape and a chaotic arrangement. The absence of an ordered geometry of grains impedes the effective process of cutting metal. This follows from a comparison of the geometry of blade tools (cutters, drills, milling cutters, etc.) with grinding. With blade tools, the cutting wedges are honed with high precision and in accordance with the recommendations of the directories. And in grinding tools, the geometry of grains varies arbitrarily in a wide range from isometric to lamellar varieties. In addition, the geometry of the cutting wedges of grains is influenced by their position in the body of the tool. Methods are proposed for a purposeful selection of the shape and orientation of the grains, which make it possible to improve the performance of grains and tools in general. The ordering of the grains was achieved by separating the original abrasive mass from the vibratory separator into a series of fractions with the same grain form. Orientation of the grains was provided due to the electrostatic effect and a specially developed method. The technology for manufacturing experimental grinding wheels with a controlled shape and orientation of the grains has been designed. A pilot batch of experimental grinding wheels was made. The design of a test bench for evaluating the performance characteristics of experimental circles has been developed. Comparative tests of such circles with flat grinding relative to standard tools have been carried out. During the tests, the following parameters were monitored: cutting capacity, grinding coefficient, cutting force components, effective power, heating temperature of the part, roughness of the surfaces to be treated. The results of the tests show that the experimental tools for a number of performance indicators exceed standard wheels.

Key words: grinding tools shape and orientation of grains manufacture of wheels comparative tests performance indicators

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