JPH11104701A - Making of shape steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of manufacturing an asymmetric shape steel of dimensional accuracy with optional shapes such as the round shape of corner division of the foot tip of the flange, by rolling the shape steel in which the flanges of right and left are asymmetric, using a universal mill one of whose paired length roll is a barreled roll. SOLUTION: A shape steel is rolled so that the flange thickness is horizontally even from right and left and closed at the side 13 of the extrorse taper of a level roll 10 and the circumference surface 14 of the extrorse taper of a barreled length roll 12, at start and under rolling of a flange 22 with narrower flange width of a universal mill. Therefore, the flange 22 is rolled so that it is naturally located in the center of the vertical direction of the gap of the practically rhombic shape formed by the side 13, 13 with tapers of the level roll 10, 10 and the circumference surface 14, 14 with tapers of the barreled length roll 12. Therefore the asymmetric shape steel with dimensional accuracy and of which flange leg length is uniform is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for manufacturing a shaped steel, and more particularly to a method for manufacturing a shaped steel having different left and right flange shapes.

[0002]

2. Description of the Related Art FIG. 8 shows a typical manufacturing process of an H-section steel in which right and left flanges are symmetric. FIG. 8A shows that a beam blank 60 having a substantially H shape is manufactured by continuous casting.
Using this as a raw material, an H-section steel 65 is manufactured by the following forming rolling 61 and further universal rolling steps 62, 63, 64. FIG. 8B shows a method of manufacturing an H-section steel 65 by using a rectangular continuous cast slab 66, for example, a slab, as a raw material, and forming and rolling 67 and then universal rolling steps 62, 63 and 64.

On the other hand, in the case of producing a shaped steel having asymmetrical flanges on the left and right sides, as shown in FIG. In the subsequent universal rolling steps 72, 73, and 74, a pair of left and right vertical drums having the same drum shape as in the case of the H-section steel in FIG. 8 are formed in the universal rolling steps 72, 73, and 74 shown in FIG. The asymmetrical section steel 75 was manufactured by rolling using 78.

[0004]

When the asymmetrical section steel 75 as shown in FIG. 10 is manufactured by the above-described method in which the thickness of one flange 75b is thinner toward the foot and the flange width is narrower, the universal rolling is required. As shown in FIG. 11, the leg lengths of the flanges 75a and 75b are likely to be non-uniform, and it is difficult to manufacture a shaped steel having good dimensional accuracy. This is because if the vertical roll is drum-shaped at the time of universal rolling, the center of the flange 75a, particularly at a narrow flange width, is likely to be shifted up and down with respect to the vertical roll. As shown in FIG. 12, since the raw material 20 is inclined and bites into the rolling mill, the leg lengths at the narrow flange width portion 22 as well as at the wide flange width portion 21 are not uniform.

[0005] In recent years, in the field of steel bridges, for example, a rounded girder material is required at the corner of the foot of the flange due to the need for maintenance-free such as improvement of paintability or drainage of raindrops. I have. However, in the conventional manufacturing method, the corner portion at the toe of the flange can be rolled only in a right angle shape, and the shaped steel having the rounded corner at the toe of the flange cannot be rolled.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is intended to manufacture an asymmetric steel section having good dimensional accuracy and having an arbitrary shape such as a rounded corner at the foot of a flange. It is intended to obtain a method.

[0007]

According to a first method of manufacturing a shaped steel according to the present invention, there is provided a method of manufacturing a shaped steel by universal rolling, wherein a universal rolling mill in which one of a pair of vertical rolls has a drum-shaped roll. Is characterized in that a left and right flange is rolled into an asymmetrical shaped steel.
In the second manufacturing method of the present invention, the material to be rolled is guided by disposing a guide device for individually supporting or restraining the left and right flanges of the material to be rolled on the entry side of the universal rolling mill. Further, in a third manufacturing method of the present invention, in the first or second method for manufacturing a shaped steel, a plurality of dies are arranged on a roll of an edging mill, and these dies are moved in a roll axis direction. By properly using
It is to form the corner of the toe of the flange.

In the first manufacturing method of the present invention, one of the pair of vertical rolls of the universal rolling mill is a drum-shaped roll. Therefore, during universal rolling, the flange has a tapered side surface of a horizontal roll and a drum-shaped vertical roll. Since the vertical component of the rolling reaction force received from the tapered outer peripheral surface always acts toward the center of the flange, the center of the flange is automatically positioned on the pass line for vertical displacement of the flange. The self-centering property of positioning is exhibited. Therefore, the length of the flange legs can be made uniform, and an asymmetric section steel with good dimensional accuracy can be manufactured.

In the second manufacturing method of the present invention, since the guide devices for individually supporting or restraining the left and right flanges of the material to be rolled are arranged on the entry side of the universal rolling mill, the rolling entry side table must be horizontal. The asymmetric rolling material is bitten into the universal rolling mill at an appropriate position and posture without being affected by the above-mentioned effects, and in combination with the above-described self-centering property of the flange, uniform dimensional accuracy of the flange leg length is obtained. Good asymmetric steel shapes can be manufactured.

[0010] In the third manufacturing method of the present invention, a plurality of dies are arranged on the roll of the edging mill and the roll is movable in the axial direction. Secondary processing of an arbitrary shape such as roundness can be formed simultaneously with rolling at the toe.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the outline of an embodiment of the present invention. In FIG. 1, 1 is a heating furnace, 2 is a shaping mill, 3, 3A is a universal mill, 4, 4A is an edging mill, 5 is a finishing universal mill, and 6, 6A and 6B are universal mills of these. It is a guide device arranged on the entrance side of the machine. Reference numeral 7 denotes an approximately H which has been shaped and rolled by the shaping mill 2.
The material of the shape is shown.

An outline of the operation in the above-mentioned production line will be described. First, the rolled material is heated to a rolling temperature in the heating furnace 1, and then formed and rolled by the forming and rolling machine 2 into a material 7 whose left and right flanges are asymmetric. This material 7
Are universal rolling mills 3, 3A, by guide devices 6, 6A, 6B for supporting or restraining the left and right flanges individually.
5 is properly introduced into the gap between the rolls, is rolled, and a plurality of dies are arranged on the roll, and these dies are properly used in the edging mills 4 and 4A in which the rolls can be moved in the axial direction. The flange width is reduced or the toe of the flange is formed, and by repeating this, the thickness of the web and the thickness and width of the left and right flanges are reduced and adjusted, and finally, the finished universal rolling mill 5 forms the product into a product shape. .

The present invention will be described in more detail. FIG. 2 shows a state at the time of universal rolling in which one of the vertical rolls is a drum shape, which is one of the features of the present invention. FIG. 2 shows the configuration of universal rolling mills 3 and 3A used for rough rolling. In FIG.
Is one drum-shaped vertical roll, 12 is the other drum-shaped vertical roll,
Reference numeral 13 denotes a tapered side surface of the horizontal roll 10, and reference numeral 14 denotes a tapered outer peripheral surface of the drum-shaped vertical roll 12. Reference numeral 20 denotes a material to be rolled, reference numeral 21 denotes a wide flange, and reference numeral 22 denotes a narrow flange.

Since the universal rolling mills 3 and 3A are configured as described above, the outer tapered side surface 13 of the horizontal roll 10 is formed at the start of rolling of the flange 22 having the smaller flange width and during rolling. And drum-shaped vertical roll 1
Since the thickness of the flange on the outer peripheral surface 14 of the outward taper 2 is uniformly rolled from the left and right in the horizontal direction and closed, the flange 22 naturally has the tapered side surfaces 13 and 13 of the horizontal rolls 10 and the drum-shaped vertical. The roll 12 is rolled so as to be located at the center in the vertical direction of the substantially rhombic gap formed by the tapered outer peripheral surfaces 14, 14.

FIGS. 3A and 3B show the rolling reaction force acting during rolling. FIG. 3A shows the case of the present invention, and FIG. 3B shows the case of the conventional method. As shown by the dotted line in FIG. 3A, for example, when the flange 22 bites in an upward direction, the upper thickness reduction becomes larger than the lower thickness. The forces PH1 and PV1 are larger than the lower rolling reaction forces PH2 and PV2, and the component forces PHY1 and PVY1 in the vertical direction.
Is larger than the vertical component force PHY2 and PVY2,
The flange 22 moves downward so that the vertical component of the rolling reaction force is balanced, and the upper and lower flange leg lengths are uniformly rolled. On the other hand, when a conventional drum-shaped vertical roll is used, as shown in FIG.
The vertical reaction forces PH1 and PVY1 of the rolling reaction forces PH1 and PV1 received from the tapered side surface 77 and the tapered outer peripheral surface 79 of the vertical roll 78 cancel each other out, and cannot exhibit the self-centering property as in the present invention.

Further, in the finish universal rolling, as shown in FIG. 4A, in the present invention, the deformation and the shape of the flanges 21 and 22 have already been appropriately adjusted in the rough universal rolling. Although the horizontal roll 30 and the vertical rolls 31 and 32 of FIG.
In the conventional method shown in (1), since a particularly narrow flange needs to be set up vertically, the deformation is unreasonable, and here too, the flange leg length tends to be uneven.

Next, guide devices 6, 6A and 6B for individually supporting or restraining the left and right flanges, which are the second feature of the present invention, are arranged on the entry side of the universal rolling mill. This will be described with reference to FIG. Since all the guide devices have the same configuration, the guide device 6 will be described as a representative. 5A is a front view, and FIG. 5B is a side view. The guide device 6 includes guide rollers 61, 62, 6 whose vertical positions are individually adjusted so as to come into contact with the end surfaces of the flanges 21, 22 of the material to be rolled 20, respectively.
3, 64. Although means for moving these guide rollers in the vertical direction are not shown, they can be implemented using a normal cylinder, screw shaft, link mechanism, or the like.

In the conventional method, since the roller table on the entry side of the universal rolling mill is horizontal, as shown in FIG. 12, the material 20 to be rolled, which is asymmetrical left and right, is inclined and bites into the roll gap of the universal rolling mill. This promotes unevenness of the leg length of the flange. In the present invention, for example, as shown in FIG. 5, the guide device 6 for individually supporting or restraining the left and right flanges 21 and 22 is disposed on the rolling entry side,
By making the rolled material 20 bite in the proper position and posture with respect to the roll gap of the universal rolling mill so that the flange leg length is not uniform, even if the leg length is not uniform, By adjusting the position of the guide device 6 individually on the left and right, the flange leg length can be made uniform.

FIG. 6 shows a third feature of the present invention, namely, a method of arranging a plurality of cavities on a roll of an edging rolling mill, and forming a corner portion of a flange toe by properly using these cavities. , FIG. In the figure, 40 is the first
Edging roll, 41 has a plurality of cavities 42, 43, 4
4 is a second edging roll configured to be movable in the direction of the roll axis 45. That is, the first edging roll 40 corresponding to the flange 21 having the larger flange width and the second edging roll 41 corresponding to the flange 22 having the smaller flange width are separated from each other and relatively move in the roll axis direction. It is possible.

As shown in FIG. 6, the hole 42 is used until the pass near the end where the thickness of the universal rolling flange is reduced.
In the vicinity of the final pass, as shown in FIG. 7, the second edging roll 41 in which the dies are arranged is moved in the axial direction, and the dies 43 having rounded corners are formed.
Edging with In the case of rolling a size having a different flange thickness, rolling is performed using the same groove 42 as described above until near the final pass, and edging is performed using a different groove 44 near the final pass. Thus, not only can the flange toe corner be rounded, but also in the case of different sizes of the flange thickness, it is possible to manufacture without changing the roll.

[0021]

As described above, according to the present invention, since the rolling material is rolled by using one of the vertical rolls, which is a component of the universal rolling mill, having a drum shape, the length of the flange leg is uniform. It is possible to manufacture highly accurate asymmetric steel bars. In addition, by arranging a guide device for individually supporting or restraining the left and right flanges on the rolling entry side, the material to be rolled can be introduced into the universal rolling mill at an appropriate position and posture, so that higher dimensional accuracy can be achieved. Asymmetric steel sections can be manufactured. In addition, a plurality of dies are arranged on the roll of the edging mill, and these dies are moved in the roll axis direction to selectively use the dies so that the toes of the flange are formed. Can be subjected to secondary processing of any shape.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an outline of a manufacturing method of the present invention.

FIG. 2 is a configuration diagram of a universal rolling mill.

FIG. 3 is an explanatory diagram showing the action of a rolling reaction force during rolling in the case of the present invention and a conventional method.

FIG. 4 is an explanatory diagram showing an operation at the time of finish universal rolling in the case of the present invention and a conventional method.

FIG. 5 is a front view and a side view of the guide device.

FIG. 6 is a configuration diagram of an edging rolling mill.

FIG. 7 is an explanatory view showing an operation of rounding a flange toe by an edging rolling mill.

FIG. 8 is an explanatory view of a conventional method for manufacturing a symmetric steel.

FIG. 9 is an explanatory view of a conventional method for producing an asymmetric steel section.

FIG. 10 is a diagram showing an example of an asymmetric steel section.

FIG. 11 is a diagram showing a state in which the flange leg lengths of the asymmetric steel bars are not uniform.

FIG. 12 is an explanatory view showing a state in which an asymmetric shaped steel bites into a universal rolling mill.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating furnace 2 Modeling rolling mill 3, 3A universal rolling mill 4, 4A edging rolling mill 5 Finishing universal rolling mill 6, 6A, 6B Guide device 7 Material 10 Horizontal roll 11 Drum type vertical roll 12 Drum type vertical roll 20 Rolled material 21, 22 Flange 40 First edging roll 41 Second edging roll 42, 43, 44 Hole 45 Roll axis

Claims (3)

[Claims] 1. A method for producing a shaped steel by universal rolling, characterized in that a shaped steel whose left and right flanges are asymmetrical is rolled using a universal rolling mill in which one of a pair of vertical rolls has a drum-shaped roll. Manufacturing method of shaped steel. 2. The rolled material is guided by arranging a guide device for individually supporting or restraining the left and right flanges of the rolled material on the entry side of the universal rolling mill. The method of manufacturing shaped steel. 3. The method for producing a shaped steel according to claim 1, wherein a plurality of dies are arranged on a roll of the edging mill, and these dies are moved in the roll axis direction and used properly. A method for manufacturing a shaped steel, comprising forming a corner of a toe of a flange.