Authors: А.Kh. Rakhimyanov, Yu.S. Semenova, A.A. Zhivaga

Title of the article: Technological modes for ultrasonic surface hardening of parts with thin-layer coatings

Year: 2018, Issue: 2, Pages: 84-92

Branch of knowledge: Mechanical engineering and machine science

Index UDK: 621.9.048.6

DOI: 10.26730/1999-4125-2018-2-84-92

Abstract: The application of thin-layer functional coatings requires a special approach to the final surface processing. To ensure keeping of the coating properties, it is necessary to provide such an effect on the coating material that will allow the maintaining of its integrity and functionality. In this paper, the prospects of using ultrasonic surface hardening as a hardening-finishing processing of products with thin-layer coatings are presented. Within the framework of the studies conducted, limitations on the designation of technological mode were revealed. These limitations related both to the capabilities of the equipment and the need to ensure the required surface and surface layer properties. The characteristics of the equipment, that determine the processing parameters, are identified. For these parameters, the dependencies of the diameter of a single tool imprint on the static force of pressing the tool to the part are shown. The conditions for obtaining a regular microrelief formed on the surface to be treated are established based on the calculation of the imprint diameter. The regular microrelief is formed by overlapping these imprints when the tool and the surface being processed moved reciprocally. The ranges of values of the mode parameters of ultrasonic plastic deformation of cylindrical parts made of hardened and non-hardened steel 45, providing the formation of a regular microrelief on the processed surface, are determined.

Key words: ultrasonic plastic deformation microhardness microrelief cementation mathematical planning

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