PROSPECTS OF USE AND ASSESSMENT OF CONDITIONS FOR IMPLEMENTATION OF PROCESSES OF BURNISHING OF TITANIUM ALLOY PARTS
DOI:
https://doi.org/10.18372/0370-2197.1(110).20929Keywords:
diamond burnishing, gas turbine engine parts, titanium alloys, stress-strain state, friction coefficient controlAbstract
Based on the analysis of scientific publications, the prospects of using the process of diamond burnishing of titanium alloy parts are considered. It is shown that an effective finishing treatment for increasing the service life of products is burnishing the surface of parts by creating a surface with low roughness and residual compressive stresses in the surface layer with a thickness of up to 140 - 200 microns. It is practically impossible to achieve such a level of quality parameters for titanium alloys due to the high adhesive properties of titanium. Numerical calculation methods show that in the range of friction coefficient values from 0.05 to 0.25 at the active stage under load, the value of normal stresses in the direction of burnishing practically does not depend on the friction coefficient. At the same time, the maximum value of shear stresses on the surface of the part increases as the friction coefficient increases by more than 3 times. This leads to a decrease in residual normal stresses after burnishing with an increase in the friction coefficient and to a decrease in the endurance limit of the material, and accordingly, the resource of the part. It has been established that to increase the efficiency of burnishing of titanium-based alloys, it is necessary to create conditions for reducing the friction coefficient. The work proposes the most effective directions for reducing the friction coefficient during burnishing of titanium alloys: applying physicochemical coatings to the surface of the part and controlling the technological modes of the burnishing process.
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