Nippon Steel Sumitomo Metal Corporation

Shigeru Kidani

Akihito Yamane

[Problem to be Solved] A device for adjusting the rolling positions of rolling rolls and restraining poor roll-biting of the front edge part of a pipe material rolled by a three-roll mandrel mill includes pressing-down devices(P1 to P6) for moving rolling rolls Rto Rin the rolling direction and a control unitfor controlling the pressing-down devices. Immediately after the front edge part of a pipe material T has begun to be rolled by the rolling rolls disposed on at least one rolling stand of the rolling rolls Rto R, the control unitcontrols the pressing-down deviceto move the rolling rolls in the closing direction. Preferably, the rolling rolls disposed on at least one rolling stand of the rolling rolls Rto Rin the closing direction are moved at a speed of 16 mm/sec or higher using the pressing-down device

Growing community of inventors

Tokyo, Japan

Shigeru Kidani