RATIONAL CONDITIONS FOR ULTRASONIC STABILIZATION OF RESIDUAL STRESSES IN ROUND PLATES

Abstract

In modern conditions of a market economy, the problem of improving the quality of products and ensuring their competitiveness for the countries of the Eurasian Economic Union is becoming the most urgent. The solution of existing problems is aimed at the development of processing methods based on the use of ultrasonic energy. The use of ultrasound makes it possible to increase the scientific and technical level of technological processes for processing parts from hard-to-process materials in mechanical engineering, and in some cases, to solve technological problems of their production in a fundamentally new way. (Research purpose) The research purpose is the optimization of the processing mode of round elastic plates, widely used in various automatic devices in order to stabilize residual stresses in their material. (Materials and methods) One of the most important requirements for such products is the exact match of the deformation value of the plate and the measured pressure of the medium. This is not always ensured due to the emerging phenomenon of elastic static hysteresis, as a result part of the energy spent on deformation of the plate is absorbed by the plate material and a so-called hysteresis loop is formed. This leads to a significant loss of accuracy of measuring instruments. (Results and discussion) The article presents the main stages of the process of choosing stabilization conditions: describing the tasks of ultrasonic vibromechanical processing; justification of the criterion for describing conditions; identification of statistical parameters characterizing the initial state of the part; mathematical modeling of the potential energy of residual stresses in the part; modeling the relaxation process of residual stresses in the part. (Conclusions) The theoretical foundations of a new microdynamic method allows correcting deviations of geometric shape, removing residual stresses and stabilizing the geometric parameters of round plates.