Mishchenko O. Development of the theory of formation and reduction of the transverse wall thickness variation of cold-rolled tubes from titanium alloys

The dissertation is aimed at theoretical and experimental substantiation of the formation and reduction of the wall transverse thickness of cold-rolled tubes made of titanium alloys and the development of a method for calculating their final transverse thickness for conditions of multi-pass cold rolling. The application of the method creates conditions for improving the accuracy of pipes of this range. The thesis presents theoretical generalizations and a new solution to the scientific and applied problem, which consists in the development of the scientific basis of the method for calculating the transverse thickness of pipes made of titanium-based alloys during cold pilger rolling on a mandrel. The problem is solved by theoretical and experimental investigation of the mechanism of reducing the transverse eccentric wall transverse thickness of pipes when they are deformed on the mandrel in cold pilger rolling mills. A set of views on the essence of the mechanism of formation of the wall transverse thickness of cold-rolled pipes made of titanium-based alloys is research in-depth. The calculation method is developed for determining the eccentric transverse wall transverse thickness of pipes made of titanium-based alloys during their multi-pass deformation on the mandrel during cold pilger rolling. The practical significance of the obtained results lies in the creation of a developed method for calculating the final transverse wall thickness of pipes made of titanium alloys for conditions of multi-pass cold pilger rolling and the creation of an appropriate software product «CRT mills - forecast of tube wall transverse variation».