Abstract: To improve forming performance in a smart mill allowing implementation of required forming by moving a forming tool arranged in a stand of a pipe mill automatically to a predetermined position. Non-drive type breakdown rolls BD exclusive to bending are arranged in multiple stands. Drive roll DR stands exclusive to driving are arranged in stages in front of and behind each DR stand. The drive roll DR is configured to apply thrust to a central portion of a raw material using an upper flat roll and a lower flat roll, and has thrust control means and driving rotation number control means for applying thrust required for passage through the step using the drive rolls DR in multiple stages entirely and controlling the thrust.

Abstract: [Problem to be solved] To provide a squeeze device of excellent economic efficiency and excellent workability for electric resistance welded pipe manufacturing having a simple configuration, achieving size reduction and weight reduction easily, and allowing operation in roll changing to be performed simply. [Solution] The squeeze device includes: a U-shaped fixed stand 10 with an open top; and a slidable roll support plate 60 inserted into the U-shaped fixed stand 10 through the open top of the U-shaped fixed stand 10 and held in the U-shaped fixed stand 10 in a manner allowing taking off of the roll support plate 60. The roll support plate 60 supports right and left side rolls 40 in a pair and an upper roll 50 on an upstream-side main surface in a manner allowing the side rolls 40 and the upper roll 50 to move in screw down directions. The roll support plate 60 has space 61 for passage of the pipe-shaped material formed at a position surrounded by these rolls.

Abstract: To enhance forming performance enhanced in square tube forming of forming a round tube into a square tube by passing the round tube through a plurality of roll stands arranged in a raw tube forming direction. To give a high degree of multi-usability to a square tube forming device. To suppress the entire length of a roll stand array. A first flat roll stand 20A and a second flat roll stand 20B of rolling directions orthogonal to each other are arranged alternately in a forming direction to form a roll stand array 10. Each of the roll stands 20A and 20B includes roll gap adjusting means by which a rolling amount is independently settable, and one of the first flat roll stand 20A and the second flat roll stand 20B adjacent to each other is driven to rotate by roll driving means 40. A forming rolling amount distribution is allocated individually as a rolling amount at each of the roll stands 20A and 20B.