THE ROUGHNESS OF TREATED SURFACE UNDER THE ULTRASONIC SUPERFINISHING OF DETAILS FROM VT3-1 AND VT 22 TITANIUM ALLOYS

To guarantee operational characteristics in the process of manufacturing parts for aeronautical equipment and rocket production, it is necessary to satisfy strict technological requirements. The production of a surface with minimum roughness is one of such requirement which is worthy of separate attention as this factor directly influences the fatigue strength and the resource. The objects of the study are the titanium alloys which are characterized by low cutting performance and proved to have valuable structural properties. The paper describes the mechanism for the formation of irregularities of parts depending on the properties of treated material, types of processing, equipment parameters, tools, processing modes, and other design and technology factors. The paper presents the results of the study of the influence of ultrasonic superfinishing technological process modes on the value of roughness of a treated surface of titanium alloy parts. The authors carried out the research when finishing titanium alloys using the ceramic-based bars of green silicon carbide and the ultrasonic head. In the research process, the authors calculated the bearing surface area to define the forms of the lobes of irregularity top sides at various bearing area values. For this purpose, the authors determined the corner radius R and the angle b which is formed by the profile sides. To obtain the relation between the relative bearing area and relative approach of bearing area curves, the least square method was used. The research allowed concluding that the applying of ultrasonic oscillations to the processing area with the simultaneous oscillation mechanism transmission to the hones in the process of superfinishing caused the decrease in roughness by 15-25 % in comparison with usual superfinishing.