Kawasaki Steel Corporation

Hiroyuki Hayashi

Hironori Miura

Tsuneo Seto

Yoji Fujimoto

Takaaki Iguchi

Atsushi Hatanaka

Shinji Inamura

Method for detecting setting errors of clearance between rollers in

A method of producing H-beams is carried out by rolling a rough rolled steel billet having a web and flanges by a universal finishing mill having a pair of vertical rolls embracing the flanges of the billet on both sides and a pair of horizontal rolls having widths less than those in the rough rolling and embracing the web on upper and lower sides to reduce the web width and thicknesses of the flanges of the billet and to correct inclination of the flanges, thereby reducing and adjusting an inner web width of the H-beam. The billet is finish-rolled in a state such that the axes of the pair of vertical rolls are shifted onto the downstream side of the axes of the pair of horizontal rolls into an area including a zone where the web width and the thicknesses of the flanges are simultaneously reduced. In another aspect, the billet is rolled by the universal finishing mill whose pair of vertical rolls are positively driven.

Method of rolling H-beams

Adjustable width rolls are preferably used for rolling, for example, insides of H-beams of various sizes without exchanging horizontal rolls of a rolling mill. Each of the adjustable width rolls includes a roll shaft rotatably and axially movably supported relative to the rolling mill, and axially adjustable sleeve roll fixed to the roll shaft, and an axially stationary sleeve roll mounted on the roll shaft to be axially slidable but against rotatable relatively to the roll shaft. The adjustable width roll further includes an axially adjustable roll fixedly supported by the axially adjustable sleeve roll to form substantially one half of a rolling barrel of the adjustable width roll, an axially stationary roll fixedly supported by the axially stationary sleeve roll to form substantially the remaining half of the rolling barrel of the adjustable width roll, and a driving mechanism for driving the roll shaft in axial directions of the roll shaft.

Adjustable width rolls for rolling mill

H-shaped steel products having substantially a constant web height are efficiently manufactured from workpieces after breakdown rolling by using a particular universal rolling mill comprising a pair of width variable horizontal rolls and a pair of vertical rolls in rough universal rolling and/or finish universal rolling stages without arrangement of rolls in the same size series having different flange thicknesses.

Method of rolling H-shaped steels

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Chiba, Japan

Hiroyuki Hayashi