Primetals Technologies Japan, Ltd.

Mitsubishi Heavy Industries Limited

Akira Sako

Kanji Hayashi

Shinya Kanemori

Toru Takeguchi

Akio Kuroda

Kenji Horii

Tatsunori Sugimoto

Hideaki Furumoto

Tadashi Hiura

Jiro Hasai

Hideki Tonaka

Masashi Yoshikawa

Fuchen Wang

Taroh Satoh

Shoozoo Tashiro

Takao Owada

Guohua Xu

Syuji Maniwa

Hiroaki Watanabe

Qun Fan

Dale Sun

Angles of an upper-side pair of an upper work rollA and an upper backup rollA, and a lower-side pair of a lower work rollB and a lower backup rollB are adjusted in a state where the upper-side pair is kept parallel and in a state where the lower-side pair is kept parallel. Thereafter, work-roll pressing apparatusesA andB, work-roll position control apparatusesA andB, backup-roll pressing apparatusesA andB, and backup-roll position control apparatusesA andB are controlled such that the angles of the upper work rollA and the lower work rollB are adjusted in a state where the angles of the upper backup rollA and the lower backup rollB are maintained.

Hot rolling mills and hot rolling methods

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.

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

Rolling apparatus and a rolling method

A roll replacing method and a roll replacing system for a chockless rolling mill, in which bearings for supporting the ends of work rolls are supported at an eccentric position of rotary bushes on housings, and the rotary bushes are turned to set a roll gap, includes, pulling out the chockless rolling mill from a rolling line onto a pullout track extending perpendicularly to the rolling line; fixing the housing on a drive side onto the pullout track at a nearest position, moving a support trestle perpendicularly to the pullout track, and fitting the support trestle between the pullout track and the upper and lower work rolls to support these work rolls on the support trestle; separating the housing on a work side, the trestle, and the upper and lower work rolls, as a unit, from each other and from the drive-side housing, and moving them onto the pullout track until they come to a halt; and moving the trestle and the upper and lower work rolls as a unit onto a roll replacement track perpendicular to the pullout track, to replace the upper and lower work rolls as a unit by spare upper and lower work rolls as a unit, or to replace the trestle and the upper and lower work rolls, as a unit, by a spare trestle and spare upper and lower work rolls as a unit.

Roll replacing method and system for chockless rolling mill

Growing community of inventors

Hiroshima, Japan

Akira Sako