PIERCER ROLL Russian patent published in 2024 - IPC B21B27/02 B21B19/04 

FIELD: milling.

SUBSTANCE: piercer roll. The roll contains a guide section, input and output cones. On the guide section there is a protrusion in the form of a radial ridge. Using mathematical relationships, the guide section of length L₁ and the angle of the guide section generatrix with the rolling axis were calculated α₁.

EFFECT: stable grip of the workpiece by the rollers of the piercer roll is ensured, its centering along the rolling axis at the moment of gripping the workpiece by the rolls and a reduction in the thickness difference of the pipe workpiece during rolling by rolls.

4 cl, 2 tbl, 3 dwg