Authors: A.N. Korotkov, V.A. Korotkov, V.G. Bashtanov, M.P. Vidyaev

Title of the article: Research of the efficiency of application in grinding wheels as pores of hollow spherocorundum and glass microspheres

Year: 2023, Issue: 1, Pages: 13-23

Branch of knowledge: 2.5.5. Technology and equipment for mechanical and physical-technical processing

Index UDK: 621.922.3

DOI: 10.26730/1999-4125-2023-1-13-23

Abstract: Research has been carried out in the field of creation and application of highly porous grinding wheels using various pore-forming components - hollow (hollow) spherocorundum and glass microspheres. Hollow spherocorundums are produced from a melt of white electrocorundum (99% Al2O3), they have medium and large sizes (400÷5000 µm), i.e. grain numbers and wall thicknesses up to several tens of microns. Glass microspheres (the main component is SiO2) differ from spherocorundums in significantly smaller sizes (20–160 µm) and wall cross sections up to 2 µm. Both of these components can be used as pores in highly porous grinding wheels, which provide reduced heat stress in the grinding process and reduce the effect of tool clogging. The difference in size, chemical composition and properties of hollow spherocorundum and glass microspheres affect the difference in performance of grinding tools. Therefore, in the present work, experimental wheels were made and tested, where 40% of the abrasive grains of normal electrocorundum grade 13A63N (630 μm) were replaced by hollow spherical corundum grade ES63 (630 μm) or glass microspheres of grade MS-V (90 μm). To ensure comparative tests, reference wheels were also made and tested with the initial percentage of abrasive. The tests were carried out on a flat grinding operation on a machine model 3G71 by processing workpieces from tool steel ShKh15 in the delivery condition (HB 190). As a result, it was found that the use of glass microspheres in grinding wheels is much more efficient than hollow spherocorundum in terms of the main performance indicators: grinding coefficient, grinding temperatures and roughness of the treated surfaces.

Key words: Polishing process highly porous grinding wheels hollow spherocorundum glass microspheres grinding coefficient temperature during grinding roughness of the treated surfaces

Receiving date: 11.02.2023

Approval date: 27.02.2023

Publication date: 30.03.2023

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