JPH07303921A - Method and device for straightening h-shape steel - Google Patents

Abstract

PURPOSE:To enable even a large H-shape steel with less web thickness to be straightened by arranging zigzag on both sides of the H-shape steel a plural number of rings that come into loaded contact with the flange end face of the steel, rotating the plural rings in the delivering direction of the steel and thereby imparting bending deformation repeatedly to the steel. CONSTITUTION:A ring 3 that comes into loaded contact with the flange end face 57 of an H-shape steel 51 is flattened, enlarging a contact area between the flange end face 57 and the ring 3, and reducing the load per unit area of the flange end face 57. In addition, while the steel 51 is delivered by the ring 3 rotated by a driving shaft 5, a bending deformation is repeatedly imparted to the flange end face 57 by the ring, straightening the H-shape steel 51. The ring 3 is also pressurized to the side of the steel 51 by a loading roll, enlarging the flatness of the ring. Further, a vertical roll 11 arranged closely to each ring 3 on both sides of the steel 51 prevents the fall of the side face of the flange.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for straightening H-section steel manufactured by hot rolling or welding.

[0002]

2. Description of the Related Art Since H-section steel as manufactured by hot rolling or welding has bending or warpage in whole or locally, it is cold straightened straight and shipped as a product. Is normal. As such a cold straightening method, there are a press straightening method and a roller straightening method. However, in the press straightening method, it is inefficient because appropriate deformation is applied by a pressing metal fitting while observing the shape before straightening, which is not suitable for mass production. .
On the other hand, the roller straightening method is a method of straightening the H-section steel by repeatedly bending the H-section steel with a large number of rollers, which is efficient and is installed and used as an online facility in a factory. 14 and 15 are explanatory views of a conventional H-section steel straightening method, and show a contact state between a straightening roller and an H-section steel in a conventional roller straightening method. As shown in these figures, the conventional roller straightening machine load method is shown in FIG. 14, in which the web 53 of the H-section steel 51 is loaded by the outer peripheral surface of the roller 55, and FIG. Flange end face 5 of H-section steel 51
There are two types of flange reduction type in which 7 is loaded by the outer peripheral surface of the roller 59.

[0003]

However, any of the rolling systems has the following problems. That is, the problem of the web reduction method is that, in the case of H-section steel having a wider flange width than the web plate thickness, the load by the roller 55 is converted into a slack of the web, and sufficient bending deformation does not occur in the flange. Only the local contact between the roller 55 and the web 53 is plastically deformed and, in severe cases, even cracks occur.

As a means for suppressing such local deformation, there is a straightening roll of a roller straightening machine for H-section steel disclosed in Japanese Patent Publication No. 57-61488. What is described in the publication is to avoid the occurrence of local deformation by devising the shape of the roll that presses the web, but the local deformation is unavoidable because the web is pressed down, and it is essential. It cannot be a solution to any problem. This is especially true in today's demand for thinner web products.

A problem with the flange reduction method is that when the flange width is wide and a large bending load is required, the flange end surface 57 in contact with the roller 59 is crushed and the flange width is significantly reduced. Is. Such a problem is caused by a decrease in load due to an increase in roller spacing and a contact area between the roller and the flange due to an increase in roller diameter, as proposed in JP-B-56-40646 and JP-A-53-141158. However, if such a means is not only inevitably increased in equipment size and construction cost, but also if the roller interval is increased, the uncorrectable portion at both ends of the H-section steel will be reduced. Since the length is also long, these means are naturally limited.

In order to overcome the drawbacks of the above two methods, FIG.
As shown in FIG. 7, as a method of simultaneously pressing down the flange end surface 57 and the web 53 by the rollers 61 and 63, for example, there is a method disclosed in Japanese Examined Patent Publication No. 57-11728. However, since this method also involves the complicated mechanism and reduction of the web 53, it is inevitable that the above-mentioned problem of local deformation is exposed if the web thickness is not reduced.

Further, as another example, Japanese Patent Publication No. 56-4568.
There is one disclosed in Japanese Patent No. 4 publication. According to the publication, the stepped rollers are arranged in a staggered manner on both sides of the flange of the H-section steel, and the load and step on the outer surface of the flange of the H-section steel by the outer peripheral surface of the small diameter portion of the stepped roller. By applying a load to the flange end surface of the H-section steel by the large-diameter step end surface of the attached roller, the H-section steel is repeatedly bent and deformed about two axes to correct the H-section steel. However, in this method, the speed of the stepped end surface of the large diameter portion of the stepped roller is different between the outer peripheral side and the inner peripheral side, so that shearing force is applied to the flange end surface that is pressed down by this, which induces the collapse of the flange. Will be done. In addition, there are problems that the load at the portion where the flange starts contacting and the portion where the flange comes out of contact become high, and that the straightening machine is a dedicated H-section steel machine. As described above, none of the conventional methods can effectively correct an H-section steel having a large cross section, and it has been desired to develop an H-section steel straightening method and an apparatus for realizing the same.

The present invention has been made to solve the above problems, and an object thereof is to provide a straightening method for H-section steel and a device therefor capable of straightening even a large H-section steel having a small web thickness. .

[0009]

A method for straightening H-section steel according to the present invention comprises a plurality of rings arranged in zigzag on both sides of the H-section steel in load contact with the flange end faces of the H-section steel. The ring is rotated in the feeding direction of the H-section steel so that the H-section steel is repeatedly subjected to bending deformation.

Further, the flange is prevented from falling down by applying a load to the both side surfaces of the flange from the outside by rollers.

Further, the flange is prevented from falling down by restraining the inner surface of the flange.

Further, the flange is prevented from falling down, and a load is applied to the H-section steel web.

Further, the load on the end face of the flange by the ring is made constant.

Further, the load on the flange and the load on the web are individually controlled.

Further, the straightening device for H-section steel according to the present invention comprises:
In a straightening device for an H-section steel for straightening the H-section steel by repeatedly applying bending deformation to the H-section steel, the H-section steel is arranged in a zigzag pattern on both sides of the H-section steel and a flange end surface of the H-section steel is loaded. A plurality of rings that come into contact with each other and a plurality of drive shafts that rotate the plurality of rings in the feed direction of the H-section steel are provided.

Further, one or more load rolls for pressing the rings toward the H-shaped steel are provided for each ring.

Further, vertical rolls for pressing the side surface of the flange are arranged on both sides of the H-section steel in the vicinity of each ring.

[0018]

In the straightening method for the H-section steel configured as described above, the ring that is in load contact with the flange end surface of the H-section steel is flat, and the contact area between the flange end surface and the ring becomes large. The load per unit area is reduced.

Further, in the H-section steel straightening device configured as described above, the contact area between the flange end surface and the ring increases due to the flatness of the ring that makes load contact with the flange end surface of the H-section steel. Further, while the ring rotating by the drive shaft sends out the H-section steel, the flange end face is repeatedly bent and deformed to correct the H-section steel.

Further, the load roll presses the ring toward the H-section steel to increase the flatness of the ring.

Further, vertical rolls arranged on both sides of the H-section steel close to each ring prevent the side surfaces of the flange from falling.

[0022]

【Example】

Example 1. FIG. 1 is an explanatory view for explaining a main configuration of one embodiment of the present invention, and shows a state of the H-shaped steel 51 as viewed from a side surface of a flange. FIG. 2 is a view of FIG. 1 as viewed from the traveling direction when the H-section steel is being straightened. In the figure, reference numeral 1 is a ring roll reduction device, in which the ring 3 is arranged on the outer periphery of the drive shaft 5 in place of the roller 59 of the roller straightening machine shown in FIG. 15 which is a conventional example. The inner diameter of the ring 3 is formed to be larger than the outer diameter of the drive shaft 5, and when the ring 3 is fitted into the drive shaft 5, a constant gap is formed as shown in FIG. Further, the ring 3 is in frictional contact with the drive shaft 5, and when the drive shaft 5 rotates, it rotates due to the frictional force generated between the two. Further, the drive shaft 5 fitted with the ring 3 (hereinafter referred to as "ring roll") is located at the same position as the roller 59 of the conventional roller straightener, that is, at both end surfaces 57 of the H-section steel flange. In contrast, they are arranged in a staggered pattern.

FIG. 3 is an explanatory view for explaining a contact state between the ring 3 and the flange end surface. FIG. 3 (a) shows a conventional example, and FIG. 3 (b).
Shows the respective examples. The mechanism at the time of rolling reduction in the ring roll will be described based on FIGS. 2 and 3. As is clear from FIG. 2, y of H-section steel 51
The bending deformation load around the axis is transmitted by the contact surface of the ring 3 that contacts the flange end surface 57. The black portion in FIG. 3 indicates the contact portion between the ring 3 and the flange end surface 57. As is clear from this, the area of this portion is larger than that of the conventional example (FIG. 3 (a)). (Fig. 3 (b)
) Is slightly larger. This is because when the ring 3 is pressed from the inside by the drive shaft 5, a bending moment that causes the ring 3 to be concavely bent toward the flange end surface 57 side acts on the inner surface of the ring 3, and the ring 3 is thus flatly deformed. is there. This is a phenomenon that occurs because there is a gap between the ring 3 and the drive shaft 5. In a conventional roller straightening machine in which the drive shaft and the roll are joined together without a gap, the pressing force of the drive shaft causes When the roll is about to undergo flat deformation, it cannot be flatly deformed due to being constrained by the outer peripheral surface of the drive shaft.

The ring 3 is flatly deformed by the mechanism as described above, and the outer peripheral surface of the ring 3 and the flange end surface 57.
Since the contact area becomes larger and the load per unit area of the flange end surface 57 becomes smaller, the crushing of this portion becomes extremely smaller than that of the conventional example. Regarding the straightening operation of the H-section steel 51, similarly to the conventional roll straightening machine, the H-section steel 51 is sequentially fed by the rotation of the ring 3 and straightened by the pressing force of the ring 3 from the vertical direction in the figure.

Example 2. FIG. 4 is an explanatory diagram for explaining the main configuration of another embodiment of the present invention. In this embodiment,
On the side of the ring 3 opposite to the H-shaped steel 51, a load roll 7 is provided in contact with the peripheral surface thereof to apply a constant load. The ring 3 is flattened by the load applied from the load roll 7. As a result, the ring 3 and the flange end surface 5
The contact area of 7 can be made larger. The load roll 7 itself may be driven, and by doing so, the ring 3 can rotate more smoothly.

Example 3. FIG. 5 is an explanatory view for explaining the main constitution of another embodiment of the present invention, and FIG. 6 is a view of FIG. 5 viewed from the advancing direction when straightening the H-section steel. In this embodiment, the vertical roller 11 for pressing the flange outer surface 58 of the H-shaped steel 51 is provided in the apparatus of the embodiment shown in FIG. This can prevent the flange from falling down when the flange end 57 is loaded.

Example 4. FIG. 7 is an explanatory diagram illustrating the main configuration of another embodiment of the present invention. In this embodiment,
The flange collapse prevention roll 13 that is inscribed in the flange inner side surface 56 is provided.
Is designed to prevent the flange from falling. The flange collapse prevention roll 13 does not contact the web 53 as shown in FIG. 7, and functions exclusively to prevent the flange collapse.

Example 5. FIG. 8 is an explanatory diagram for explaining the main configuration of another embodiment of the present invention. In this embodiment,
The ring 3 is pressed down on the flange end surface 57 and the web pressing roll 15 is pressed down on the web 53 at the same time. By individually controlling the web reduction load P1 and the flange reduction load P2, it is possible to repeatedly bend and deform the web 53 while preventing the constriction of the wenob 53, and to correct the flange collapse.

Example 6. In the above embodiment, the flange 3 is pressed down by the ring 3 to increase the contact area with the flange end 57 and prevent the flange end 57 from being crushed.
In the case where the flange width of the H-section steel varies, the conventional straightening method of fixing the intermesh may apply a large load to a portion having a large width, and the flange end surface 57 may be crushed. In fact, the H-section steel after rolling and before straightening usually has variations in flange width and the like, and when it is large, it may reach several mm. Therefore, an embodiment of an H-section steel straightening method and its apparatus which can cope with such variations in flange width and the like will be described below.

When the web is pressed, the roll load is used for both the bending deformation of the flange and the bending deformation of the web, so that it is difficult to determine the required load. However, when the flange is rolled down, the rolling load is used as it is as a bending moment, so setting by the load is easy. Since the bending moment and the curvature have the relationship shown in FIG. 9, the bending moment of each roll may be set as shown in FIG. 10, for example. 9 and 10, M is the bending moment actually applied, Me is the elastic limit bending moment, Ki is the curvature of the H-shaped steel actually bent, and Ke is the bending limit due to the elastic limit bending moment Me. Shows the curvature of. Further, b in FIG. 9 indicates the thickness of the flange, and t2 indicates the width of the flange. further,
In FIG. 10, # 2 to # 8 indicate each roll ring.

With respect to the setting of the bending moment as described above, the load actually applied to each ring roll is given by the following equation. P _i = (M _i-1 + 2M _i + M _{i + 1} ) / L where i: roll number L: roll pitch P _i : ring roll load M _i : bending moment

As the load control method, a preset load is determined by the above formula and the rolling control is performed so as to achieve this load, or an intermesh is preset and the H-section steel is bitten into the ring roll. There is a method to hold the load at that time.

Although the installation interval and the number of each ring roll described above also depend on the cross-sectional dimension of the H-section steel to be straightened, in order to perform the repeated bending deformation the same number of times as the conventional roller straightening, It is desirable that the number is about 10 to 10.
Further, it is possible to provide a ring roll only in the front stage portion where the load is large and to straighten the web or flange in the rear stage portion. Of course, cantilever,
It is applicable to both double-ended straighteners. Furthermore, if the ring roll part is made removable, it becomes possible to select and use the conventional type of roller straightening appropriately, and the conventional roll can be used to ring other shaped steels other than H-shaped steel. It can be applied simply by changing to a roll. Also, a guide for correctly inserting the ring roll pair on the drive shaft,
By appropriately arranging a ring roll interval adjusting device, a vertical position adjusting device, and a driving device, it is possible to continuously and effectively correct H-section steel having various cross-sectional dimensions.

Next, the effect of the first embodiment shown in FIG. 1 is shown in FIG.
This will be described in comparison with the conventional web reduction method shown in FIG.
Table 1 shows the dimensions of the H-section steel to be straightened and the specifications of the actual straightening machine. Table 2 shows intermesh in Example 1 and the conventional web straightening method.

[0035]

[Table 1]

[0036]

[Table 2]

Table 3 and FIGS. 1 to 13 show Tables 1 and 2 above.
2 shows the effect of the conventional method and that of Example 1 when the H-section steel is straightened according to the specifications of FIG.

[0038]

[Table 3]

In Table 3, the correction effect means the amount represented by the following formula. Straightening effect = Post-correction shape evaluation amount / Pre-correction shape evaluation amount Here, the post-correction shape evaluation amount is an evaluation amount defined by JIS standard, for example, and is an amount representing the degree of bending with respect to a certain length of H-section steel. Is.

FIG. 11 is a graph showing the reduced state of the web thickness, where the vertical axis represents the web thickness (mm) and the horizontal axis represents the distance (mm) from the web center. As can be seen from FIG. 11, the web thickness is reduced by about 0.25 mm in the conventional example, while it is almost absent in the case of the present embodiment.

FIG. 12 is a graph showing an increase state of the web height, in which the vertical axis shows the web height (mm) and the horizontal axis shows the longitudinal position (M) of the H-section steel. As can be seen from FIG. 13, according to the conventional example, the height of the web is increased by about 1.6 mm, whereas in the case of the present example, it is hardly seen.

FIG. 13 is a graph showing the increasing state of the change in web hardness, in which the vertical axis shows the hardness (Kgf) and the horizontal axis shows the distance from the flange surface of the H-section steel. As can be seen from FIG. 14, according to the conventional example, a large increase in hardness occurs at the base portion of the flange and the web, but in the case of the present embodiment, it is almost the same.

Regarding the changes in the flange width and the flange thickness, there are almost no conventional examples, but according to Example 1, as shown in Table 3, a decrease of 0.5 mm and a decrease of 0.2 m are obtained.
An increase in m occurred. However, these have practically no problems. As described above, according to Example 1, it was confirmed that only slight crushing occurs at the flange end portion, and it is possible to effectively perform straightening without causing any change in web height.

Next, the effect of the fifth embodiment shown in FIG. 8 is shown in FIG.
This will be described in comparison with the conventional web reduction method shown in FIG.
However, the ring roll was not driven. Table 4 shows the dimensions of the H-section steel as the material to be straightened and the specifications for straightening the actual equipment. Table 5
Shows the bending moment for each roll number set by the setting method shown in FIG. Table 6 shows the load setting value for each roll, and the total load required for each roll is 15 for the web side and the flange side, respectively.
%, 85%, and the load was set so that the load was controlled by the above-described load control method.

[0045]

[Table 4]

[0046]

[Table 5]

[0047]

[Table 6]

Table 7 shows a comparison between the effects of the conventional method and this embodiment.

[0049]

[Table 7]

As can be seen from Table 7, the changes in the flange width and the flange thickness are as follows:
In contrast to the increase of 0.2 mm in this example, as shown in Table 7, the decrease of 0.3 mm and the decrease of 0.1 mm are obtained, respectively, and it can be seen that the crushing of the flange end is reduced as compared with the first example. This is because the bending load was also shared by the web. From the above, according to this example, it was confirmed that the H-section steel can be more effectively straightened without causing any change in web height.

[0051]

As described in detail above, according to the present invention, the flange end face of the H-section steel is loaded by the ring, so that the contact area between the ring and the flange end face becomes large and the flange end face is crushed. Can be prevented. As a result, it has become possible to efficiently correct a large H-section steel having a small web thickness.

Further, since the load is applied to both side surfaces of the flange from the outside by rollers, it is possible to prevent the flange from collapsing.

Further, since the inner surface of the flange is constrained, it is possible to prevent the flange from falling down.

Further, since the flange is prevented from falling inward and the web of the H-section steel is loaded, the straightening can be performed more efficiently.

Further, since the load on the flange end face by the ring is made constant, the flange end face is not crushed even when the flange width varies.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating a main configuration of an embodiment of the present invention.

FIG. 2 is a view of FIG. 1 viewed from a traveling direction when straightening an H-section steel.

FIG. 3 is an explanatory diagram illustrating a contact state between a ring 3 and a flange end surface.

FIG. 4 is an explanatory diagram illustrating a main configuration of another embodiment of the present invention.

FIG. 5 is an explanatory diagram illustrating a main configuration of another embodiment of the present invention.

FIG. 6 is a view of FIG. 5 viewed from the traveling direction during straightening of the H-section steel.

FIG. 7 is an explanatory diagram illustrating a main configuration of another embodiment of the present invention.

FIG. 8 is an explanatory diagram illustrating a main configuration of another embodiment of the present invention.

FIG. 9 is a graph showing the relationship between bending moment and curvature.

FIG. 10 is a graph showing a relationship between bending moments when a reduction setting is performed.

FIG. 11 is a graph showing a comparison of a web thickness reduction state according to the present embodiment and a conventional example.

FIG. 12 is a graph showing a comparison of web height increase states according to this embodiment and a conventional example.

FIG. 13 is a graph showing a comparison between the increasing state of the change in web hardness according to the present example and the conventional example.

FIG. 14 is an explanatory view of a contact state between a straightening roller and an H-section steel in a conventional web reduction method.

FIG. 15 is an explanatory view of a contact state between a straightening roller and an H-section steel in a conventional flange reduction method.

FIG. 16 is an explanatory view of a contact state between a straightening roller and an H-section steel in a conventional method of simultaneously pressing down a flange and a web.

[Explanation of symbols]

 1 Ring roll reduction device 3 Ring 5 Drive shaft 7 Load roll 11 Vertical roll 13 Flange fall prevention roll 15 Web reduction roll 51 H-section steel 53 Web 56 Flange inner surface 57 Flange end surface 58 Flange outer surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Misao Makinohara 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Naoki Kataoka 1-2-1 Marunouchi, Chiyoda-ku, Tokyo No. Nihon Kokan KK (72) Inventor Masaru Fukumura 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan KK

Claims (9)

[Claims] 1. A plurality of rings, which come into load contact with a flange end surface of the H-section steel, are arranged on both sides of the H-section steel in a staggered manner, and the plurality of rings are rotated in a feeding direction of the H-section steel. A method for straightening an H-section steel, which comprises repeatedly bending-deforming the H-section steel. 2. The method for straightening H-section steel according to claim 1, wherein the flange is prevented from falling by applying a load to both side surfaces of the flange from outside thereof by rollers. 3. The method of straightening H-section steel according to claim 1, wherein the flange is prevented from falling down by restraining the inner surface of the flange. 4. The H according to claim 1, wherein the flange is prevented from falling down by restraining the inner surface of the flange, and a load is applied to the H-section steel web.
Shaped steel straightening method. 5. The load on the flange end face by the ring is made constant so that the load is constant.
A method for straightening the H-section steel described. 6. The method for straightening H-section steel according to claim 4, wherein the load on the flange and the load on the web are individually controlled. 7. A straightening device for H-section steel for straightening the H-section steel by repeatedly applying bending deformation to the H-section steel, wherein the H-section steel is arranged in zigzag on both sides of the H-section steel. A straightening device for H-section steel, comprising: a plurality of rings that come into load contact with the flange end surface of 1. and a plurality of drive shafts that rotate the plurality of rings in the feeding direction of the H-section steel. 8. The straightening device for H-section steel according to claim 7, wherein one or more load rolls for pressing the ring toward the H-section steel are provided for each ring. 9. The straightening device for H-section steel according to claim 7, wherein vertical rolls for pressing the side surface of the flange are arranged close to each ring on both sides of the H-section steel.