Jfe Steel Corporation

Hideto Yamaguchi

Hiroto Goto

Yukio Takashima

Tatsuhiro Sue

Yukihiro Matsubara

Tomoyoshi Ogasahara

Mitsutoshi Kemmochi

Shohei Nishi

A meandering amount arithmetically operating device of a meandering amount measurement device calculates the meandering amount of a steel sheet using a drive side edge site z(N) and a work side edge sites z(N) at a current time when a measurement reliability determination unit determines that both the drive side edge site z(N) and the work side edge sites z(N) at the current time have high reliability. When only one of the drive side edge site z(N) and the work side edge site z(N) at the current time is determined to have high reliability, the other edge site is calculated by interpolation using the number of pixels W from a sheet width updating unit with the drive side edge sites z(N) or the work side edge site z(N) at the current time having high reliability as a reference.

Steel-sheet meandering amount measurement device, steel-sheet meandering amount measurement method, hot-rolling equipment for hot-rolled steel strip, and hot-rolling method of hot-rolled steel strip

A meandering control device and hot rolling equipment suppress a meandering amount of a hot-rolled steel strip. A roll opening degree difference between an operation side and a driving side in an i-th rolling machine computed in a leveling control computation step (step S) in the meandering control method, satisfies the roll opening degree difference between the operation side and the driving side in the i-th rolling machine (Fi) by Expressions (1), (2), and (3) in a control section j, in a case where the control section j is set when a tail end portion (Sa) of a traveling hot-rolled steel strip () is present between a j-th (j≤i−1) rolling machine (Fj) and a (j+1)th rolling machine (Fj+1) counting from a rolling machine (F) installed on a most upstream side.

Meandering control method for hot-rolled steel strip, meandering control device, and hot rolling equipment

A meandering control method for steel strip includes: an imaging step of imaging the surface of a traveling steel strip using a line sensor camera installed between adjacent rolling mills; a meandering amount calculation step of calculating the meandering amount of the steel strip by detecting the positions of both end portions in the width direction of the steel strip from a one-dimensional brightness distribution based on the captured image; and a leveling control arithmetic operation step of arithmetically operating a roll opening difference between the operation and drive sides of the rolling mill located on the immediately downstream side of the line sensor camera based on the calculated meandering amount. The imaging is performed in a period of 5 msec or less.

Meandering control method, meandering control device, and hot rolling equipment for hot rolled steel strip

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Tokyo, Japan

Hideto Yamaguchi