JPH0985343A - Method and equipment for roller-straightening wide flange beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the method and device for straightening a wide flange beam capable of straightening even the large wide flange beam of small web thickness. SOLUTION: Repeated straightening of bending is performed by rolling down a web of a wide flange beam 1 by horizontal rolls 10 which are alternately provided in the vertical direction along the advancing direction of the wide flange beam 1, each side face of the flange of the wide flange beam 1 is rolled down by vertical rolls 11, and the web of the wide flange beam 1 is pressed by opposite horizontal rolls 12 arranged opposite to the horizontal rolls 10. Localized contact of the horizontal rolls 10 with a fillet part of the wide flange beam 1 is prevented, and the contact distributed load is leveled. The change in the web height can be suppressed, and straightening without fillet cracking can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller straightening method and apparatus for H-section steel manufactured by hot rolling or welding, and particularly to a large size which cannot be effectively straightened due to the restriction of the cross-sectional dimension. Shape H-shaped steel straightening.

[0002]

2. Description of the Related Art H as manufactured by hot rolling or welding
Since the shaped steel is bent or warped as a whole or locally, it is usually cold straightened and then shipped. As a cold straightening method, press straightening or roller straightening is often used, but the former is not efficient because it is appropriately deformed by a press fitting while observing the shape before straightening, and is not suitable for mass production. On the other hand, the roller straightening method is a straightening method in which the H-section steel is straightened by repeatedly bending it with a large number of rollers, is efficient, and is installed and used as an online facility in a factory.

FIG. 7 and FIG. 8 show a part of the contact state between the straightening roller and the H-section steel in the conventional roller straightening method. As you can see in these figures,
The conventional roller straightening machine has a web rolling method in which the web 3 of the H-section steel 1 is loaded by the outer circumference of the roller 4 as shown in FIG. 7, and a flange 2 of the H-section steel 1 as shown in FIG. There are two types of flange reduction methods in which the ends are loaded by the outer circumference of the roller 5. However, whichever rolling down method is employed, the following problems cannot be avoided.

That is, in the web reduction method of FIG. 7, in the case of H-section steel having a flange width wider than the web plate thickness, the load by the roller 4 is converted into the deflection of the web 3 and the flange 2 is sufficiently deformed. Not only bending deformation does not occur, but only the local contact portion between the roller 4 and the web 3 is plastically deformed and, in severe cases, cracking may occur. Japanese Examined Patent Publication No. 57-61488 proposes to devise the shape of the roll for pressing the web in order to suppress such local deformation, but considering the situation where a product having a thinner web thickness is required, Such a method cannot essentially solve the problem.

Further, in the flange reduction method of FIG. 8, when the flange width is wide and a large bending load is required, the end of the flange 2 in contact with the roller 5 is crushed and the flange 2 The width is greatly reduced. Such problems have been proposed in Japanese Patent Publication No. 56-40646 and Japanese Patent Publication No. 53-141158.
The load is reduced by increasing the roller spacing, and it is reduced to some extent by increasing the contact area between the roller and the flange by increasing the roller diameter.However, such means inevitably leads to an increase in equipment size and an increase in construction cost. Not only that, if the roller interval is increased, the lengths of the uncorrectable portions at both ends of the H-section steel also become longer, so that these means are naturally limited.

[0006]

As described above, in either of the conventional web reduction system and flange reduction system,
Although it is clear that H-section steel with a large cross section cannot be effectively corrected, the current situation is that the web reduction method is unavoidable. In order to solve the drawbacks of the above two methods, as shown in FIG. 9 (for example, Japanese Patent Publication No. 57-11728), a method of simultaneously pressing down the flange 2 and the web 3 has been proposed. However, it is difficult to set the load to be distributed between the flange 2 and the web 3, the height of the web 3 may be expanded, and the toes of the flange 2 may be crushed, and the mechanism may be complicated. If the thickness is further reduced, it is inevitable that the aforementioned problems will be exposed.

Further, Japanese Patent Publication No. 56-45684 proposes a rather ingenious invention to reduce the surface pressure applied to the flange when the flange is pressed, but in this method, the circumference of the portion contacting the flange is proposed. Since the speeds are different, deformation is induced in the direction of the falling of the flange, the load at the part that starts contact with the flange and the part that comes out of contact with the flange becomes high, and as a straightening machine, it is a dedicated H-section steel machine. There is a problem such as being lost.

Japanese Unexamined Patent Publication (Kokai) No. 4-59124 is intended to solve the above problem by restraining the deformation of the web by providing a vertical roll for restraining the web and restraining the flange. It is clear that simply restraining the flange against such a large load is not sufficient.

The present invention has been made to solve the above-mentioned problems, and provides a roller straightening method for H-section steel and a device therefor capable of straightening even a large H-section steel having a small web thickness. The purpose is to do.

[0010]

A roller straightening method for an H-section steel according to the present invention forms a web of the H-section steel by first horizontal rolls which are alternately provided up and down along the traveling direction of the H-section steel. While pressing and performing straightening and straightening, the both sides of the flange of the H-section steel are reduced by the vertical rolls, and the H-section steel web is formed by the second horizontal rolls arranged to face the first horizontal rolls. Press. The roller straightening device for H-section steel according to the present invention has first horizontal rolls provided alternately up and down along the traveling direction of the H-section steel, and the web of H-section steel is formed by the first horizontal rolls. In a roller straightening device for H-section steel that carries out repeated bending straightening by rolling down, a pair of vertical rolls respectively rolling down both side surfaces of a flange of H-section steel and a first horizontal roll are arranged so as to face each other. Second horizontal roll that presses the web. And
At least one of the first horizontal rolls is provided with a pair of vertical rolls and a second horizontal roll. In the present invention, the base of the web is pressed down by the first horizontal roll to repeatedly bend and straighten the web, and the side surface of the flange of the H-section steel is pressed down by the vertical roll, and the H is cut by the second horizontal roll. By pressing the web of shaped steel,
The local contact between the first horizontal roll and the fillet portion is prevented, and the contact distribution load is flattened. Therefore, the change in the height of the web is suppressed, and it is possible to correct the fillet without causing cracks.

[0011]

1 is a side view of a roller straightening device for H-section steel according to an example of an embodiment of the present invention, and FIG. 2 is an operation explanatory view seen from the front thereof. In this roller straightening device, horizontal rollers (: web rolling rolls) 10 for rolling down the web along the traveling direction of the H-shaped steel 1 are alternately arranged vertically, and a pair of vertical rollers corresponding to the respective horizontal rollers 10. A roll 11 is provided. The vertical roll 11 is provided with a reduction mechanism (not shown) for applying a reduction force. Further, facing horizontal rolls 12 are provided at positions facing the horizontal rolls 10 provided above and below, respectively. In addition, in FIGS. 1 and 2, the vertical roller 11 is used.
The opposite horizontal rolls 12 are installed corresponding to all stands, but if these are installed on at least one of the stands that are bent by the web reduction, the effect can be exerted. .

FIG. 3 is an explanatory view showing the state of local reduction of the fillet portion of H-section steel in the conventional web reduction method. A concentrated load 20 is applied to the web 3 of the H-shaped steel 1 by the horizontal pressing roller 4, and the fillet is constricted due to this load, and deformation occurs in the web height direction. This concentrated load 20 is the main cause of the change in the web height and the cracking of the fillet portion, and it is necessary to reduce it in some way. Japanese Patent Laid-Open No. 4-591
In Japanese Patent No. 24, at this time, a vertical roll is provided outside the flange 2 to restrain the flange, thereby increasing the bending rigidity of the web and suppressing the deformation thereof.
Although trying to solve the above problem, no measures have been taken to reduce the concentrated load, which is the main cause.

The inventors of the present invention have recognized that the change in web height and the crack in the fillet portion are due to the concentrated load of the horizontal roll (: web reduction roll) on the fillet portion. It was found that it is necessary to positively apply compressive stress to the web in order to improve the contact state between the web and the fillet portion and to suppress the change in web height that exerts the effect of the vertical roll. Then, the configuration shown in FIGS. 1 and 2 has been adopted.

FIG. 4 shows the pinch rolls (horizontal roll 10, opposing horizontal roll 12) and vertical roll 1 shown in FIGS. 1 and 2.
It is a figure which shows the contact state by 1 and a stress state. As shown in the figure, by applying a compressive force by the vertical rolls 11 and a reverse pressing force by the facing horizontal rolls 12, the horizontal rolls 10 contact the web 3 in a wider range, and the contact load distribution becomes flat. It can be seen that the concentrated load is reduced.

The vertical roll 11 and the opposing horizontal rolls 12 for applying compressive stress to the bending of these webs are preferably installed at each stage of the conventional horizontal rolls and the number of the horizontal rolls 11 and the opposing horizontal rolls 12 are set, whether they are driven or not driven. It can be effective. Further, the vertical roll pair / opposite horizontal roll of the present invention may be provided only in the front stage portion where the load is large, and the rear stage portion may be constituted by normal web or flange roller straightening. Of course, it can be applied to both a cantilever type and a double-sided type straightener. Then, by properly laying a guide for proper insertion into the straightening device of the present invention, an interval adjusting device for the vertical roller set, a vertical position adjusting device, and a driving device of the present invention, continuous H-section steel of various cross-sectional dimensions can be obtained.・ Effective correction is possible.

[0016]

EXAMPLES Table 1 is a table showing the dimensions of the material to be straightened according to the present invention and the specifications of the actual straightening machine. Table 2 is a table showing the intermesh compared with the conventional web straightening method. Table 3 is a table showing the effect of the present invention compared with the conventional method.

[0017]

[Table 1]

[0018]

[Table 2]

[0019]

[Table 3]

From the above characteristics, according to the straightening of the present invention, there is no fillet crack as compared with the conventional web rolling straightening,
It can be seen that the change in web height is also small.

FIG. 5 is a characteristic diagram showing the relationship between the reduction load of the vertical roll and the web height in the present invention. From the figure, it can be seen that the web height itself can be controlled by the vertical roll reduction load. Also, from the figure, it can be seen that simply restraining the flange with a vertical roll is not effective. The characteristics shown in FIG. 5 are all average values. FIG. 6 is a characteristic diagram showing how the pressing force of the vertical roll and the pressing force of the facing horizontal roll affect the flange and the web by taking hardness. This is an investigation of the hardness distribution of the fillet portion, and it can be seen that according to the present invention, the increase in hardness of the fillet portion is small despite the reduction of the vertical roll.

[0022]

As described above, according to the present invention, the web is repeatedly bent and straightened by the first horizontal roll, and the side face of the flange of the H-section steel is pressed down by the vertical roll.
Moreover, since the H-shaped steel web is pressed by the second horizontal roll, the contact between the first horizontal roll and the fillet portion is prevented from being localized, and the contact distribution load is flattened. Therefore, the change in web height can be suppressed,
Straightening without fillet cracking is possible, and since there is no effective straightening method in the past, productivity can be reduced and the large H-shaped steel that has been straightened with a press can also be efficiently shape-corrected, resulting in product quality. An excellent effect such as improvement can be exhibited.

[Brief description of drawings]

FIG. 1 is a side view of a roller straightening machine for carrying out an example of an embodiment of the present invention.

FIG. 2 is an operation explanatory diagram when FIG. 1 is viewed from the front.

FIG. 3 is an explanatory view showing a state of local reduction of a fillet portion of H-section steel in a conventional web reduction method.

FIG. 4 is a diagram showing a stress state due to a facing horizontal roll and a vertical roll in the present invention.

FIG. 5 is a characteristic diagram showing a relationship between a rolling load and a web height of a vertical roll in the present invention.

FIG. 6 shows how the vertical roll reduction and the opposing horizontal rolls affect the flange and the web by taking hardness.

FIG. 7 is an explanatory diagram of a conventional H-section steel straightening method (No. 1).

FIG. 8 is an explanatory diagram of a conventional H-section steel straightening method (No. 2).

FIG. 9 is an explanatory diagram of a conventional H-section steel straightening method (No. 3).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Makoto Watanabe 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. Inside the Steel Pipe Corporation (72) Inventor Minoru Komatsubara 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside the Nippon Steel Pipe Corporation

Claims (3)

[Claims] 1. A web of H-section steel is pressed down by first horizontal rolls provided alternately up and down along the traveling direction of H-section steel to repeatedly bend and straighten the web of H-section steel, and vertical rolls of H-section steel A roller straightening method for H-section steel, comprising pressing down both side surfaces of a flange and pressing a web of H-section steel by a second horizontal roll arranged opposite to the first horizontal roll. 2. A first horizontal roll, which is alternately provided above and below along a traveling direction of the H-section steel, has a web of the H-section steel rolled down by the first horizontal roll to repeatedly bend and straighten. In a roller straightening device for H-section steel to be performed, a pair of vertical rolls that respectively roll down both side surfaces of a flange of H-section steel, and the first horizontal roll are arranged so as to face each other.
A second horizontal roll for pressing the H-section steel web, and an H-section steel straightening device. 3. The roller straightening for H-section steel according to claim 2, wherein the pair of vertical rolls and the second horizontal roll are provided on at least one or more of the first horizontal rolls. apparatus.