METHOD OF SEAMLESS METAL PIPE MANUFACTURING Russian patent published in 2018 - IPC B21B19/04 

FIELD: rolling of pipes.

SUBSTANCE: invention relates to pipes rolling. Continuous billet is subjected to rolling-piercing, using a rolling mill with four inclined rollers, including having larger diameter main conical (1, 1') rollers, which are installed horizontally or vertically relative to each other across the rolling line (X-X), and having smaller diameter auxiliary conical rolls (7, 7'), which are installed vertically or horizontally facing each other also across the rolling (X-X) line and between the arranged facing each other main rolls, while maintaining the feeding angle (β) and the main rolls rolling angle (γ), as well as the angle (β') of feeding and the auxiliary rolls rolling angle (γ') in the regulated ranges.

EFFECT: invention allows the thin-walled hollow piece manufacturing at a great degree of reduction from the billet consisting of poorly shaped material.

4 cl, 8 dwg