Bending Steel Billet on Presses of Tube Electrical Welding Aggregation

At the production of the steel thick-walled large-diameter pipes according to UOE-technology at the tube electrical welding aggregation 1020 (TEWA 1020), the steel sheet is in series bent on the flanging press, the pre-forming press and the final-forming press. When the steel sheet is deformed on the final-forming press, the excessively curved sections of the sheet are partially unbent in the opposite direction. The calculation of sheet’s curvature at the alternating bending causes the significant difficulties because of Bauschinger’s effect at bending, in which the mechanical characteristics of the steel change significantly. In this paper, the analytical method for calculating the final curvature of steel pipe billet at the alternating bend at UOE-technology is proposed. The results of the paper can be applied in metallurgy.

Algorithm to Find Technical Solutions for the Modernization of the Cold Rolling Mill of Large Diameter Pipes

The problem of reconstruction and modernization of manufacturing equipment for the production of large diameter pipes was considered in this paper. To assess the strength and the technical resource of the equipment was used mathematical modeling based on the experimental results and consistent solution of nonlinear boundary value problem of the elasticity theory. The results of solution for the tube cold mill, which were used for design of the new equipment, are given