Primetals Technologies Japan, Ltd.

Shinya Kanemori

Masahiro Yamada

Hideaki Furumoto

Akira Sako

Jiro Hasai

Kanji Hayashi

Akio Kuroda

Kenji Horii

Tatsunori Sugimoto

Toru Takeguchi

Tadashi Hiura

Hideki Tonaka

Taroh Satoh

Masashi Yoshikawa

Takashi Yonekura

Masao Tambara

Fuchen Wang

Shuji Maniwa

Guohua Xu

Masatomo Yamane

Hironori Abe

Kazuki Yoshida

Chitoshi Mochizuki

Akihiro Omura

Qun Fan

Dale Sun

A hot rolling millincludes a control apparatusthat adjusts an angle formed between an upper-side pair of an upper backup rollA and an upper work rollA and a lower-side pair of a lower backup rollB and a lower work rollB in a state where the upper-side pair is kept parallel and in a state where the lower-side pair is kept parallel. The hot rolling millis configured such that the work rollsA andB satisfy the condition that DW/Lb is equal to or smaller than 0.30 where DW is a diameter of the work rollsA andB, and Lb is the maximum strip width of a rolled material, and the hot rolling millperforms rolling in a state where a bending force is applied to the work rolls.

Hot rolling mills and hot rolling methods

A control deviceobtains second pressing forces acting on work-side and drive-side roll chocksA andB on the basis of entry side and exit side first pressing forces, and controls at least one of work roll position control devicesB andB and at least one of work roll pressing devicesB andB changing a position of at least one of the roll chocksA andB in such a manner that a difference between the work-side second pressing force and the drive-side second pressing force is equal to or smaller than a predetermined value.

Rolling mills and rolling methods

There are provided a work-side position measurement device and a drive-side position measurement device for directly measuring positions of roll chocks in a rolling direction, and positions of upper and lower working rolls and upper and lower backup rolls in the rolling direction are adjusted to zero point or predetermined positions. Alternatively, a change caused in the strip wedge due to a minute crossing of the axes of working rolls and backup rolls is calculated, and the quantities of leveling of a work-side rolling reduction cylinder device and a drive-side rolling reduction cylinder device are adjusted to make the strip edge equal to or smaller than a predetermined value. Accordingly, the bilateral asymmetry (strip wedge) of the thickness distribution of a rolled material is easily adjusted even in the event that the positions of the roll chocks in the rolling direction are changed due to wear on various components.

Rolling mill and rolling mill adjustment method

When a portion for measuring the plating adhesion amount reaches an upstream side position, plating adhesion amount estimation values are calculated by using a plating adhesion amount estimation expression at positions away from a position that faces the distance sensors, that is, the upstream side position, by strip-width direction distances, of the surfaces of the steel strip. When the portion for measuring the plating adhesion amount reaches a downstream side position, the strip-width direction distances of the plating adhesion amount meters are matched to the strip-width direction distances, and the plating adhesion amount actual measurement values are obtained. The plating adhesion amount estimation expression is corrected on the basis of the differences between the plating adhesion amount estimation values and the plating adhesion amount actual measurement values. Accordingly, the control accuracy of the plating adhesion amount is improved.

Plating adhesion amount control mechanism and method for controlling an adhesion amount by comparing a plating adhesion amount estimation value at an upstream position and a plating adhesion actual amount at a downstream position

In a decision control device of a control system, a predetermined pass schedule is decided by adjusting the rolling force per unit width at a last stand of a hot finishing tandem rolling mill to cause the edge profile on the outlet side of the last stand to fall within an allowable range based on the relationship between a strip crown and the edge profile on the outlet side of the last stand with respect to the rolling force per unit width and a strip shape control parameter, obtained regarding the last stand, and adjusting the strip shape control parameter of the last stand to cause the strip shape on the outlet side of the last stand to fall within an allowable range and cause the strip crown to become a predetermined value or smaller.

Strip profile control method of hot finishing tandem rolling mill and hot finishing tandem rolling mill

Provided are hot rolling equipment and a hot rolling method for precisely controlling the meandering and plate shape of a steel strip, thereby making it possible to prevent tail end squeezing of the steel strip. Hot rolling equipment () for this purpose, for sequentially passing a steel strip () through rolling machines () and thereby rolling the steel strip (), wherein a plurality of split rolls () capable of contacting the steel strip () is provided between the rolling machines (), and, when the split rolls () contact the steel strip (), detection torques (Td, Tw) acting on the left and right ends of the split rolls () are detected by torque detectors (), the reduction leveling of the rolling machines () being adjusted on the basis of the detected detection torques (Td, Tw) to control the meandering and plate shape of the steel strip ().

Hot rolling equipment and hot rolling method

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Hiroshima, Japan

Shinya Kanemori