JPH04322820A - Correction device for warping and squareness of H-beam steel - Google Patents

Abstract

PURPOSE:To reduce the straightening load for working on a web, and simultaneously, to prevent the deformation of a flange, and to effectively execute straightening, in the device for straightening a camber of a wide flange shape. CONSTITUTION:In a roller straightening device for rolling down a web of a right angle straightening vertical rollers 4, 5 which have center shafts in the face containing the center shafts of horizontal rollers 2, 3, abut on the outside surface of a flange. and can tilt against the direction running along the flange width direction are provided, and by these vertical rollers 4, 5, the outside surface of the flange is detained, and also, straightening of squareness of the flange is also executed simultaneously.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a straightening device for straightening the shape of H-section steel.

0002

2. Description of the Related Art Rolled H-section steel is generally hot-formed using a universal mill equipped with coaxial upper and lower horizontal rollers and vertical rollers. Hot-formed H-section steel is cooled after rolling, but differences in cross-sectional thickness and differences in the cooling process within the cross-section cause temperature differences within the cross-section, resulting in warpage, bending, or bending as shown in Figure 4. An H-section steel 1 with such an angle defect is produced.

[0003] Any warps or bends that occur are corrected by a roller straightening device. FIGS. 5 and 6 are a side view and a sectional view illustrating a conventional correction device. By pushing the web 1a of the H-section steel 1 with rollers 2 and 3 arranged vertically and alternately in the longitudinal direction, the flange 1b is repeatedly bent and the warpage is corrected. On the other hand, a defective squareness as shown in FIG. 4 cannot be corrected using a conventional roller straightening device, so it is generally dealt with by off-line press straightening or heat straightening.

0004

[Problem to be solved by the invention] Straightening of H-beam steel is shown in Fig. 6.
This is done by pushing the web 1a with rollers 2 and 3 and applying bending deformation to the flange 1b, as shown in FIG. At this time, the rollers 2 and 3 push the vicinity of the base of the web 1a and flange 1b of the H-section steel 1, so that the web 1a is not bent. However, in reality, the web 1 bends due to the load generated during straightening, and as a result, the flange 1b falls inward and comes into contact with the rollers 2 and 3, causing plastic deformation in the flange 1b. This results in poor perpendicularity between the web 1a and the flange 1b. Furthermore, if the load is large compared to the rigidity of the web 1a, as shown in FIG. 8, the root of the web 1a and the flange 1b will be deformed or the web 1a will be bent, so sufficient warpage correction must be performed. The reality is that it is not possible.

[0005] Particularly in recent years, as quality requirements for rolled H-beams as construction materials have increased, so-called thin-walled H-beams with a large ratio of flange thickness to web thickness have been developed, and conventional orthodontic devices do not have the above-mentioned problems. This makes it increasingly difficult to correct warpage. On the other hand, regarding flange squareness defects, conventionally it is not possible to correct them online, so off-line press straightening or heating straightening is performed, but these operations are all dependent on the sensitivity of the operator, so workability and This has become a major problem in terms of productivity and quality.

In view of the above-mentioned problems, the present invention aims to correct the warpage of rolled H-section steel by preventing the deformation of the joint between the web and the flange or the collapse or bending of the flange, and at the same time, prevents the flange from having poor perpendicularity. It is an object of the present invention to provide an apparatus that can also perform squareness correction on a material to be corrected.

[0007]

[Means for Solving the Problems] The orthodontic device of the present invention has H
A roller straightening device for straightening the warpage of a section steel, having a central axis within a plane including the axis of a horizontal roller that rolls down a web,
A vertical roller that contacts the outer surface of the flange and is tiltable in a direction along the width of the flange is disposed in combination with each horizontal roller. In this device, a vertical roller is brought into contact with the outer surface of the flange of the material to be straightened during warp straightening.
At the same time as correcting the warpage of the material to be straightened, the flange squareness is also corrected.

[0008]

[Operation] Straightening of H-section steel is generally performed in the H position as shown in FIG. In the present invention, the web reduction roller (
At the same time as the web is pushed in by a horizontal roller, a vertical roller is brought into contact with the outer surface of the flange to prevent the flange from falling due to pushing the web in, and also to correct the squareness. By preventing the flange from collapsing, it is possible to prevent the flange from coming into contact with the web lowering roller, and it is possible to prevent bending deformation that occurs in the flange due to the contact.

Furthermore, by keeping the flange at a predetermined angle with the web using vertical rollers, it is possible to increase the bending rigidity of the web, and by applying a sufficient bending load to the flange that occurs during straightening, the straightening effect can be enhanced. be able to. That is, as shown in FIG. 9(a), when the flange is not restrained by the vertical rollers 12,
Since the base of the web flange corresponds to the free ends of the support beams at both ends, when the web is pushed in with the web lowering roller, the deflection and bending stress of the web become large. Therefore, if the straightening load is greater than the bending rigidity of the web, deformation of the base of the web and flange or bending deformation of the web will occur.

On the other hand, as shown in FIG. 9(b), when the flange is restrained at right angles to the web by the vertical rollers 4 and 5, the base of the web and flange is fixed at both ends. Corresponds to the fixed end of Therefore, the deflection and bending stress of the web when the web lowering roller presses the application point of the lowering force Fb are smaller than in the case of FIG. 9(a). Therefore, sufficient bending deformation can be applied to the flange without deforming the web, and a high correction effect can be obtained.

Now, assuming that the case of (a) in FIG. 9 is a beam that is simply supported at both ends in the width direction of the web, and the case of (b) is a beam that is fixedly supported at both ends, the limit bending moment at which the web does not deform is determined by M.
o, the maximum pushing force at point A in each case is determined as follows. In the case of Fig. 9(a), Fa = Mo/L2 In the case of Fig. 9(b), Fb = Mo.L/L22 As is clear from this, by arranging the vertical rollers, the A greater reduction will be applied to the

[0012] If the central axis of the vertical roller deviates from the plane containing the central axis of the web reduction roller, the restraining effect of the flange decreases in accordance with the rigidity of the flange, so that a sufficient straightening effect cannot be obtained. Therefore, the center axis of the vertical roller and the center axis of the web pressing roller need to be installed so that they are in the same plane. Furthermore, for materials with poor flange squareness before correction, the perpendicularity can be corrected by tilting the vertical roller in the direction along the flange width. The direction of the inclination is such that the flange on the side without the horizontal roller is pushed in, as shown in FIG. 10(a). In other words, as shown in FIG. 10(b), when the flange is pushed toward the side where the horizontal roller is located, not only does it promote deformation of the web and cause poor flange perpendicularity, but also the above-mentioned effect on web pushing is As a result, the warpage correction effect becomes insufficient.

[0013] By setting the inclination angle of the vertical roller to a value determined in advance depending on the size of the material to be straightened, effective straightening can be achieved. The vertical rollers are tilted by at least one pair of all the vertical rollers;
The left and right sides may be tilted at the same time, or one side at a time.

[0014]

Embodiment FIG. 2 is a roller arrangement diagram showing an embodiment of the present invention. 2a to 2g, 3a to 3g are web 1 of H-beam steel 1
This is a group of horizontal web rolling rollers for rolling down web a alternately from above and below in the longitudinal direction. 4a to 4g and 5a to 5g are vertical roller groups for restraining the outer surface of the flange, which are arranged so as to have their axes within a plane including the web lowering roller axis, and can be tilted in a direction along the flange width.

FIG. 1 is a view taken along the line A--A in FIG. 2, and is a configuration diagram of an apparatus according to an embodiment. Vertical rollers 4, 5 are supported by chocks 7 attached to blocks 6. block 6
is movable in the width direction by a rolling down device 8, and is set to a predetermined opening depending on the web height of the H-section steel. Reduction device 8
is driven by a motor 9. Lowering device 8 and motor 9
is fixed to the frame 10. Further, the block 6 is guided in the web height direction by a guide 11 attached to the frame 10. Web reduction rollers 2 and 3
is supported by a drive shaft 12, which is supported by a chock 13 attached to the frame 10 and rotated by a motor (not shown).

FIG. 3(a) shows details of the Z section in FIG. 1, and FIG. 3(b)
) is its front view. 14 is a cylinder for tilting the chock 7 attached to the block 6. The chock 7 is attached to the block 6 by a pin 15.

[0017]

According to the apparatus of the present invention, it is possible to apply a larger reduction compared to the conventional method of correcting the warpage of an H-section steel by applying bending deformation to the flange by simply rolling down the web. In other words, by disposing a vertical roller whose central axis is in the same plane as the central axis of the web reduction roller and constraining the outer surface of the flange, and by simultaneously correcting the perpendicularity of the flange during straightening, the web reduction roller can straighten the web. It is possible to increase the web bending rigidity during rolling. Therefore, a greater pushing force can be applied to the web, resulting in a higher correction effect.

Furthermore, by keeping the outer surface of the flange vertical with the vertical roller during straightening, it is possible to prevent the flange from collapsing which occurs when the web is rolled down, and to prevent the flange from being deformed due to contact between the flange and the web lowering roller. can do. Furthermore, it is possible to correct the perpendicularity by tilting the vertical roller coaxial with the web reduction roller, and because the web can be restrained by the web reduction roller, deformation of the web due to flange pushing can be prevented. This allows for more effective straightness correction.

The present invention has great effects on so-called thin-walled H-beam steel, which has a large ratio of flange thickness to web thickness.
It is possible to correct sizes that cannot be corrected with conventional roller levelers, and the press correction load can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment (view taken along the line A-A in FIG. 2).

FIG. 2 is a roller arrangement diagram showing an embodiment of the present invention.

FIG. 3 is a detail of the Z section in FIG. 1;

FIG. 4 is an explanatory diagram of poor perpendicularity.

FIG. 5 is a front view illustrating a prior art correction device.

FIG. 6 is a cross-sectional view illustrating a prior art correction device.

FIG. 7 is a cross-sectional view of the H-section steel 1 illustrating the problems of the prior art straightening device.

FIG. 8 is a cross-sectional view of the H-section steel 1 illustrating the problems of the prior art straightening device.

FIG. 9 is a cross-sectional view illustrating the positional relationship of the web pressing rollers in the direction of squareness correction.

FIG. 10 is a sectional view for explaining the operation of the present invention.

[Explanation of symbols]

1 H-shaped steel
1a Web 1b Flange 2 (2a to 2g), 3 (3a to 3g) Web lowering roller (horizontal roller)

Claims (1)

[Claims] Claim 1: A roller straightening device for correcting warpage of H-section steel, which has a central axis within a plane including the axis of a horizontal roller that rolls down a web, contacts the outer surface of a flange, and extends in a direction along the width direction of the flange. A straightening device for H-beam steel, characterized in that a vertical roller for straightening a flange that can be tilted relative to the horizontal roller is arranged in combination with each horizontal roller.