Features of the Cold-Rolling of Tubes on Tandem Mills with a Four-High Stand

Aspects of rolling on tandem four-high cold-rolling tube mills are studied. The article examines how the gear ratio of the diagonal transmission of the stand is related to the axial force on the semifinished product and loss of stability by the tube. An improved method is developed for designing the rolls so that the deformation process is divided between a pair of breakdown rolls and a pair of sizing rolls. The study is performed using an expert automated system developed to design technologies for the cold periodic rolling of tubes. The laws that govern the accumulation of damage resulting from the effects of the main process parameters are described and technical recommendations are made on mastering the use of the given type of mill.