Abstract
Certain trends in the improvement of the operations that are carried out to make cold-deformed tubes are discussed and “technological niches” are identified. Mathematical modeling is performed of the operations executed in roller drawing through one and two roller dies, periodic drawing, and the nonuniform reduction of circular tubes that vary in the thickness of their wall. The modeling is done using the finite-elements method and variational methods from metal-shaping theory. The results obtained from analyzing the laws discovered during the modeling are used to develop new methods of drawing and improve the design of the equipment used on tube cold-rolling mills.
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