A workpiece material is fed between rollers to bend the workpiece material while rolling, wherein the workpiece has a first thickness portion and a second thickness portion connected to each other with a setting angle of 90 degrees. The first thickness portion increases from an inner side toward an outer side, and a thickness on an outer peripheral side of the first thickness portion is M, and a thickness of a cross section of the second thickness portion is N. The workpiece material is rolled in such that at a completion of bending, a thickness of a cross section of a first thickness portion is m, an outer radius of the first thickness portion is R, an inner radius of the first thickness portion is r, and a thickness of a cross section of a second thickness portion is n, and M equals to m(R/r), and N equals to n(R/r).

A workpiece material is fed between rollers to bend the workpiece material while rolling, wherein the workpiece has a first thickness portion and a second thickness portion connected to each other with a setting angle of 90 degrees. The first thickness portion increases from an inner side toward an outer side, and a thickness on an outer peripheral side of the first thickness portion is M, and a thickness of a cross section of the second thickness portion is N. The workpiece material is rolled in such that at a completion of bending, a thickness of a cross section of a first thickness portion is m, an outer radius of the first thickness portion is R, an inner radius of the first thickness portion is r, and a thickness of a cross section of a second thickness portion is n, and M equals to m(R/r), and N equals to n(R/r).

Plural calibers which perform a rough rolling step include: a grooving caliber configured to perform grooving vertically with respect to end parts in a width direction of a material to be rolled; one or plural split calibers formed with projections configured to create splits vertically with respect to the end parts in the width direction of the material to be rolled after being grooved to form divided parts on the end parts of the material to be rolled; and plural bending calibers formed with projections configured to abut against the splits and sequentially bend the formed divided parts, at least the split caliber of the last stage out of the one or plural split calibers is provided with caliber side surfaces configured to abut against right and left side surfaces of the material to be rolled and restrain the material to be rolled from right and left, and in the split caliber provided with the caliber side surfaces, rolling and shaping is performed under a condition where a caliber restraining rate B becomes 0.7 or more and less than 1.0.

Plural calibers which perform a rough rolling step include: a grooving caliber configured to perform grooving vertically with respect to end parts in a width direction of a material to be rolled; one or plural split calibers formed with projections configured to create splits vertically with respect to the end parts in the width direction of the material to be rolled after being grooved to form divided parts on the end parts of the material to be rolled; and plural bending calibers formed with projections configured to abut against the splits and sequentially bend the formed divided parts, at least the split caliber of the last stage out of the one or plural split calibers is provided with caliber side surfaces configured to abut against right and left side surfaces of the material to be rolled and restrain the material to be rolled from right and left, and in the split caliber provided with the caliber side surfaces, rolling and shaping is performed under a condition where a caliber restraining rate B becomes 0.7 or more and less than 1.0.

A milling apparatus includes a plurality of milling roller units each including one milling roller that is made contact with, by pressing, one surface of one of a plurality of differently angled plate parts of an elongated metal milling material and another milling roller that is made contact with another surface of the plate part by pressing. At least one of the milling roller units mills a plate part different from a plate part milled by any other milling roller unit. A plurality of the milling roller units configured to mill an identical plate part are installed in a longitudinal direction of the plate part. The one milling roller and the other milling roller of at least one of the milling roller units are movable in axial directions thereof.

A milling apparatus includes a plurality of milling roller units each including one milling roller that is made contact with, by pressing, one surface of one of a plurality of differently angled plate parts of an elongated metal milling material and another milling roller that is made contact with another surface of the plate part by pressing. At least one of the milling roller units mills a plate part different from a plate part milled by any other milling roller unit. A plurality of the milling roller units configured to mill an identical plate part are installed in a longitudinal direction of the plate part. The one milling roller and the other milling roller of at least one of the milling roller units are movable in axial directions thereof.

A section mill (10) for the rolling of steel sections is disclosed. The section mill includes a universal mill stand (12) and an edger mill stand (14) for rolling a workpiece (18) in a plurality of back-and-forth passes into a steel section having a web and one or more flanges. The section mill further includes a cooling arrangement (16) for cooling the workpiece while it undergoes rolling during one or more of the passes. The cooling arrangement includes a cooling box (20) having a spray head (21) with spray openings (22) for spraying jets of pressurized cooling liquid against the workpiece. The cooling arrangement further includes an actuator (38, 34) configured to move the cooling box relative to the stand frame (58) of the universal mill stand and/or of the edger mill stand for adjusting a distance between the spray openings and the workpiece.

A section mill (10) for the rolling of steel sections is disclosed. The section mill includes a universal mill stand (12) and an edger mill stand (14) for rolling a workpiece (18) in a plurality of back-and-forth passes into a steel section having a web and one or more flanges. The section mill further includes a cooling arrangement (16) for cooling the workpiece while it undergoes rolling during one or more of the passes. The cooling arrangement includes a cooling box (20) having a spray head (21) with spray openings (22) for spraying jets of pressurized cooling liquid against the workpiece. The cooling arrangement further includes an actuator (38, 34) configured to move the cooling box relative to the stand frame (58) of the universal mill stand and/or of the edger mill stand for adjusting a distance between the spray openings and the workpiece.

An H-shaped steel product having a larger flange width as compared with conventional ones is efficiently and stably produced by performing flat shaping and rolling of a large-size raw blank without bringing about problems such as elongation in a web height direction and deformation of a flange corresponding part. A rough rolling step includes an edging rolling step, and a flat rolling step of performing rolling of a web part by rotating the material to be rolled after completion of the edging rolling step, upper and lower caliber rolls of at least one caliber of calibers configured to perform the flat rolling step include recessed parts configured to form a raised part at a middle of a web part of the material to be rolled, the recessed parts being provided at roll barrel length middle parts, the caliber configured to perform the flat rolling step further includes a raised part eliminating caliber configured to reduce the raised part and perform inner size widening of the web part of the material to be rolled on the material to be rolled in which the raised part is formed, rolling and shaping in the raised part eliminating caliber is performed on the material to be rolled after forming the raised part in the caliber having the recessed parts configured to form the raised part, and rolling and shaping of forming the raised part is not performed after a reduction of the raised part.

An H-shaped steel product having a larger flange width as compared with conventional ones is efficiently and stably produced by performing flat shaping and rolling of a large-size raw blank without bringing about problems such as elongation in a web height direction and deformation of a flange corresponding part. A rough rolling step includes an edging rolling step, and a flat rolling step of performing rolling of a web part by rotating the material to be rolled after completion of the edging rolling step, upper and lower caliber rolls of at least one caliber of calibers configured to perform the flat rolling step include recessed parts configured to form a raised part at a middle of a web part of the material to be rolled, the recessed parts being provided at roll barrel length middle parts, the caliber configured to perform the flat rolling step further includes a raised part eliminating caliber configured to reduce the raised part and perform inner size widening of the web part of the material to be rolled on the material to be rolled in which the raised part is formed, rolling and shaping in the raised part eliminating caliber is performed on the material to be rolled after forming the raised part in the caliber having the recessed parts configured to form the raised part, and rolling and shaping of forming the raised part is not performed after a reduction of the raised part.