摘要:
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).
摘要:
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.
摘要:
The invention relates to a method and device for producing metal sections having two profile flanges arranged opposite one another and having flange inner faces that are to be kept apart from each other by a closely toleranced final chamber dimension. In order to adapt the chamber dimension from a starting chamber dimension K0 to a desired final chamber dimension K1, the metal section is passed through the device, which forms working gaps between an inner working roll pair and outer support rolls. The working rolls that form the inner working roll pair roll over each other in order to brace the forming forces exerted on the working roll pair from the flange inner faces against each other.
摘要:
A method of forming and using a metal I-beam includes hot rolling an elongated metal workpiece to establish a web and a pair of flanges on the edges thereof. The web is formed with elongated reinforcement of solid cross-section having a generally straight longitudinal axis oriented generally parallel to the flanges. The hot rolled I-beam is cooled without forming substantial waves in the web and the I-beam is subsequently secured in a building construction or other structural product. The method involves the longitudinally oriented reinforcing means which preferably are one or more elongated laterally projecting ribs having such mass that the average temperature of the web prior to cooling will be sufficiently close to the average temperature of the flanges prior to cooling that the formation of waves within the web during cooling will be resisted. The reinforcement if preferably coextensive with the I-beam. The web is preferably substantially continuous. A corresponding I-beam and the use of the I-beam in a load bearing position in a building or other structural product are disclosed.
摘要:
A pair of edging rolls for edging the flange edges of symmetrical steel sections, particularly I-girders. Each edging roll has a barrel engaging in the inner contour of the steel section and guiding the section, and two edging paths adjoining the barrel on either side and extending outwardly in a conical shape for the flange edges of the section. The edging paths are arranged at the outer circumference of bushings which are guided so as to be displaceable coaxially at both sides of the barrel on the roll body. The bushings have end faces which face one another and engage in annular recesses of the barrel.
摘要:
In the fabrication of H-piles, I-beams, channels, tees, angles, double-tee structural shapes and similar rolling stock, a first structural shape segment or web is joined to at least one second structural shape segment or flange which may be bent outwardly. After the edging passes, during finishing, the flange or flanges are bent inwardly when the shape or stock is subjected to a final bending pass. A new bending method uses the principle of a three-roll bending process. An alternative bending solution includes a bending process with backup rolls for the first structural shape segment or web which do not touch the inner surfaces of the flanges or second structural shape segments.
摘要:
A method for producing H-shaped steel, the method includes: a rough rolling step; an intermediate rolling step; and a finish rolling step, wherein: the rough rolling step includes: an edging rolling step of rolling and shaping a material to be rolled into a predetermined almost dog-bone shape; and a flat rolling step of performing rolling of a web part with the material to be rolled after completion of the edging rolling step rotated 90° or 270°; 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 of the upper and lower caliber rolls; and a side surface inclination angle α of the formed raised part is set to 30° or more.
摘要:
A bending method feeds a long workpiece material made of metal and having a plurality of thickness portions disposed at different angles between rollers and bends the workpiece material. An initial shape of the workpiece material is a straight line or a bend with a bend radius larger than a target bend radius, a thickness of a cross section of the workpiece material along a bend radius direction is set to increase from an inner side toward an outer side of the bend radius direction, the workpiece material is fed between the rollers and rolled in a way that an amount of rolling in a region corresponding to the outer side of the bend radius direction is larger than an amount of rolling in a region corresponding to the inner side, and the workpiece material is bent to have the target bend radius from the initial shape.
摘要:
The method of rolling a wide flange beam results in an improved accuracy of the web thickness and the flange thickness in a universal rolling mill. Rolling a wide flange beam in a universal rolling mill having horizontal rolls and vertical rolls, switching over the positional control gain for each of drives for the horizontal rolls and drives for the vertical rolls by means of measured values of rolling load on the horizontal rolls and the vertical rolls during rolling, or filtering a control amount of the horizontal roll position calculated from a rolling load acting on the horizontal rolls and a control amount of the vertical roll position calculated from a rolling load acting on the vertical rolls to achieve different responses of horizontal roll rolling and vertical roll rolling, results in reducing mutual interference between horizontal roll rolling and vertical roll rolling caused through the rolling material.
摘要:
A rolling train for rolling girder sections includes at least one two-high reversing roughing stand and a plurality of subsequent universal stands for work rolling and finish rolling. Two universal stands and an upsetting stand are combined to form a reversing tandem group. A universal sizing stand for passing rolling is arranged immediately subsequent to the tandem group. The universal stands of the tandem group have double-cone shaped vertical rolls and the universal sizing stand has cylindrical vertical rolls. The girder section is rolled in several successive passes with the flanges of the section being directed outwardly and the outwardly directed flanges are rolled so as to extend parallel in a last smoothing pass.