Ishikawajima-harima Jukogyo Kabushiki Kaisha

Kabushiki Kaisha Toshiba

Nippon Steel Corporation

Hiroaki Kuwano

Takao Kawanami

Ken Okudaira

Akihiro Tanaka

Hideaki Kakuma

Toshiro Matsushita

Teruaki Motomiya

A multi-pass rolling method and a multi-pass rolling-mill stand best adapted to carry out said multi-pass rolling method. In a rolling-mill stand having three or more work rolls arranged one above the other, a workpiece is simultaneously rolled at two or more points by at least one of the work rolls.

Multi-pass rolling method and multi-path rolling-mill stand for carrying

A multi-pass rolling method which permits a multi-pass rolling-mill stand to perform multi-path rolling and still stabilize the rolling operation by preventing lateral deviation movement of a metal workpiece being rolled. The rolling-mill stand has three or more work rolls arranged one above the other and the workpiece is simultaneously rolled at two or more points by at least one of the work rolls. Directly or indirectly roll gaps are detected on the work and drive sides of at least one pass by sensors. A difference signal from the output signals of the sensors is obtained thereby determining a roll gap difference. Control devices are provided which are responsive to the difference signal for independently changing the roll gaps on the work and drive sides.

Disclosed is a direct-drive type electro-hydraulic servo valve in which dynamic characteristics of a spool are simulated by an electronic circuit or a computor to derive a signal representative of the spool velocity and the derived signal is negatively fed back to an input of a power amplifier.

Direct-drive type electro-hydraulic servo valve

Disclosed is a method and apparatus for controlling lateral unstable movement and camber of a strip being rolled in which the lateral displacement and the camber magnitude of the strip being rolled are directly detected. The lateral unstable movement is controlled by changing the right and left roll gaps of the horizontal rolling mill while the camber of the strip is corrected by changing the path line through the vertical rolling mill. As a result, the lateral unstable movement of the strip can be prevented so that the rolling operation can be carried out in a stable manner. In addition, the quality of the rolled strip can be improved and the yield can be increased.

Method and apparatus for controlling lateral unstable movement and

A winding machine for winding a strip in which a plurality of wrapper rolls disposed around a mandrel are adapted to be retracted away from the mandrel whenever the stepped portion of the strip passes them in response to the control signal generated at the time when the stepped portion passes each wrapper roll, the time being calculated automatically from the time when the stepped portion passes a specified wrapper roll.

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Yokohama, Japan

Hiroaki Kuwano