JP4811031B2 - Universal rolling method for section steel - Google Patents

Description

The present invention relates to a universal rolling method for a shape steel that rolls a shape steel such as an H-shaped steel, and more particularly to a universal rolling method for a shape steel that suppresses left and right bending of the shape steel caused by rolling the shape steel .

  A web and a shape steel having flanges on both sides of the web, represented by an H-shaped steel, are usually produced by rolling using a universal rolling mill. The universal rolling mill is a rolling mill provided with a pair of upper and lower horizontal rolls whose axis extends in the horizontal direction and a pair of left and right vertical rolls whose axis extends in the vertical direction with respect to the axis of the horizontal roll. Yes, rolled steel is manufactured by simultaneously rolling the web of rolled material from the top and bottom with a pair of horizontal rolls, and rolling the rolled material flange with the pair of vertical rolls and the side surfaces of the pair of horizontal rolls. I will do it.

  By the way, taking the case of H-shaped steel as an example, when rolling and manufacturing H-shaped steel, the bending in the left-right direction shown in FIG. 6 (a) (hereinafter referred to as bending) or FIG. 6 (b). The vertical warping shown below (hereinafter referred to as warping) tends to occur entirely or locally. As a method of correcting this bending and warping, a method of adjusting rolling conditions in a universal rolling mill is known. However, the occurrence of bending and warping is affected by the rolling unbalance of the universal rolling mill and defective shape of the material to be rolled, i.e. various vertical and horizontal asymmetric rolling factors affect the universal rolling mill and the rolled material. It is difficult to finely adjust the rolling conditions of the universal rolling mill corresponding to the above factors, and it is difficult to stably produce an H-section steel without bending or warping.

  Therefore, if bending or warping cannot be prevented even by adjusting the rolling conditions, a method for correcting the hot-rolled H-section steel after cooling it and cutting it to a predetermined length becomes indispensable. Regarding this method, warping is usually corrected online using a roller straightener, but for bending, the correction load is significantly excessive compared to warping correction. Press correction processing is performed. As described above, when the press correction process is performed off-line, the work efficiency is lowered, and the production capacity of the H-section steel is greatly hindered.

In order to solve such a problem, for example, an H-section steel rolling device shown in FIG. 7 has been proposed (see Patent Document 1).
A rolling apparatus 101 shown in FIG. 7 is a rolling apparatus provided with a universal rolling mill 102 having a pair of upper and lower horizontal rolls 102a and a pair of left and right vertical rolls 102b, 102c. Entry-side restraining rollers 103a that face the flange outer surface of the front H-shaped steel 105r and can move forward and backward toward the flange outer surface, and whose cross-sectional profile is substantially the same as the cross-sectional shape of the flange outer surface of the H-shaped steel 105r before rolling. 103b, on the exit side of the universal rolling mill 102, is opposed to the flange outer surface of the rolled H-section steel 105R and can move forward and backward toward the flange outer surface, and the cross-sectional contour shape of the flange of the rolled H-section steel 105R Outlet restraining rollers 104a and 104b having substantially the same cross-sectional shape as the outer surface are provided. The entry side restraint rollers 103a and 103b and the exit side restraint rollers 104a and 104b are brought into contact with substantially the entire outer surfaces of both flanges to roll the H-section steel while restraining the flanges.

According to the rolling method by the rolling apparatus 101, even if various horizontal asymmetric rolling factors such as the rolling balance of the universal rolling mill 102 and the horizontal shape defect of the rolled material occur, the fine rolling conditions are not adjusted. The bend of the H-section steel can be corrected online.
As another example for solving the above-described problem, for example, an H-section steel rolling device shown in FIG. 8 has been proposed (see Patent Document 2).

  The rolling apparatus 201 shown in FIG. 8 is a rolling apparatus provided with a universal rolling mill 202 having a pair of upper and lower horizontal rolls 202a and a pair of left and right vertical rolls 202b and 202c, one on the entry side of the universal rolling mill 202. The first entry side restraint devices 204, 205, and 206 are provided at positions along the exit side rolling direction of the universal rolling mill 202. The entry side restraining device 203 has entry side restraining rollers 203a and 203b that face the flange outer surface of the H-shaped steel 207r before rolling and are movable back and forth toward the flange outer surface. Further, each of the first to third outlet side restraining devices 204, 205, 206 is opposed to the flange outer surface of the rolled H-section steel 207R, and can be moved forward and backward toward the flange outer surface, the outlet side restraining rollers 204a, 204b, 205a, 205b, 206a, 206b. And, with these entry side bundle device 203 and the first to third exit side restraint devices 204, 205, 206, rolling is performed while restraining the flange outer surfaces of the H-shaped steel 207r before rolling and the H-shaped steel 207R after rolling. I have to.

Even by various rolling asymmetric rolling factors such as the rolling balance of the universal rolling mill 202 and the horizontal shape defect of the rolled material, even with the rolling method by the rolling apparatus 201, without performing delicate adjustment of rolling conditions, It is possible to correct the bending of the H-section steel online.
JP 2000-140925 A JP 2000-176502 A

However, the rolling method using the rolling device 101 shown in FIG. 7 and the rolling method using the rolling device 201 shown in FIG. 8 have the following problems.
That is, in the case of the rolling method using the rolling apparatus 101 shown in FIG. 7, the outer surface of the flange of the H-section steel 105R is restrained only at one place by the exit restraining rollers 104a and 104b on the exit side of the universal rolling mill 102. . For this reason, when there is an error in the set positions of the outlet side restraining rollers 104a and 104b, the bending of the H-section steel 105R cannot be sufficiently corrected. Further, the outlet side restraining rollers 104a and 104b for restraining the flange of the H-shaped steel 105R are arranged outside the housing of the universal rolling mill 102, and the arrangement position of the outlet side restraining rollers 104a and 104b is set at the roll bite outlet (H shape). In the longitudinal direction of the steel, it is considerably far from the center position of the vertical rolls 102b and 102c). Therefore, no matter how much the positions of the exit side restraining rollers 104a and 104b are set correctly, as shown in FIG. 9, the tip of the H-section steel 105R is between the exit of the roll bite and the exit side restraining rollers 104a and 104b. Sometimes, the exit side restraining rollers 104a and 104b cannot sufficiently restrain the tip of the H-shaped steel 105R, and eventually the local bending generated at the tip of the H-shaped steel 105R may not be corrected.

  On the other hand, in the case of the rolling method by the rolling device 201 shown in FIG. 8, the flange of the H-section steel 207R is provided at three locations of the first to third outlet restraining devices 204, 205, 206 on the outlet side of the universal rolling mill 202. The outer surface is constrained, and the effect of correcting the bending of the H-section steel 207R can be expected from the rolling method by the rolling apparatus 101 shown in FIG. However, it is only restrained intermittently in the longitudinal direction of the H-section steel 207R, and, like the rolling device 101 shown in FIG. 2, the first first outlet side that restrains the flange of the H-section steel 207R. The restraint device 204 is disposed outside the housing of the universal rolling mill 202, and the position of the first exit side restraint device 204 is considerably far from the roll bite outlet. Therefore, when the tip of the H-section steel 207R is between the roll bite outlet and the first exit side restraint device 204 or between the three first to third exit side restraint devices 204, 205, 206, the first The third exit side restraint devices 204, 205, and 206 cannot sufficiently restrain the tip of the H-section steel 207R, and eventually the local bending generated at the tip of the H-section steel 207R may not be corrected.

  Therefore, the present invention has been made in view of these problems, and the object thereof is to provide a local guide at the tip of the section steel without requiring strict setting accuracy of the guide for restraining the flange outer surface of the section steel. An object of the present invention is to provide a universal rolling mill and a universal rolling method for a shaped steel that can correct even a slight bend.

The present inventors changed the shape of various guides arranged on the exit side of the universal rolling mill to perform universal rolling of the H-section steel and experimented how the bending suppression effect changes. 10 to 12 show various types of guides.
In the form of the guide shown in FIG. 10, the rolling apparatus 301 includes a universal rolling mill 302 having a pair of upper and lower horizontal rolls 302a and a pair of left and right vertical rolls 302b and 302c, like the rolling apparatus shown in FIG. Three first to third guides 303, 304, and 305 are provided at positions along the rolling direction on the exit side of the rolling mill 302. Each of the vertical rolls 302b and 302c is supported by roll chock 302d and 302e. Each of the first to third guides 303, 304, and 305 is opposed to the flange outer surface of the rolled H-shaped steel 306 and is capable of moving back and forth toward the outer surface of the flange, 303a, 303b, 304a, 304b, and 305a. , 305b. Then, the outer surface of the flange of the H-shaped steel 306 after rolling is constrained by the roller guides 303a, 303b, 304a, 304b, 305a, 305b (actually, the gap between each roller guide and the H-shaped steel 206 is S). I'm rolling only ₄ ). The setting positions of the roller guides 303a and 303b of the first guide 303 are the center positions of the roller guides 303a and 303b from the roll bite outlet (the same position as the center position of the vertical rolls 302b and 302c in the longitudinal direction of the H-section steel). The distance L ₅ is 1.5 m in consideration of the position of the housing of the universal rolling mill 302 and the like. The distance L ₆ between the center position of the roller guides 303a and 303b of the first guide 303 and the center position of the roller guides 304a and 304b of the second guide 304 is 1.0 m, and the roller guides 304a and 304a of the second guide 304 are A distance L ₇ between the center position of 304b and the center positions of the roller guides 305a and 305b of the third guide 305 is also 1.0 m. Hereinafter, the form of the guide shown in FIG. 10 is referred to as condition (a).

Moreover, in the form of the guide shown in FIG. 11, the rolling apparatus 401 includes a universal rolling mill 402 having a pair of upper and lower horizontal rolls 402a and a pair of left and right vertical rolls 402b and 402c. Each of the vertical rolls 402b and 402c is supported by roll chock 402d and 402e. A pair of scraper guides 403a and 403b for restraining the outer surface of the flange of the H-section steel 404 are disposed on the exit side of the vertical rolls 402b and 402c of the universal rolling mill 402 and inside the roll chock 402d and 402e. It is arranged to extend from. Then, the flange outer surface scraper guide 403a of the H-beam 404 after rolling, with while restraining 403b (in fact, each scraper guides 403a, the gap between the 403b and H-beam 404 is opened only S ₅₎ I try to roll. Each scraper guide 403a, the length of 403b L ₈ has a 0.7 m. Hereinafter, the form of the guide shown in FIG. 11 is referred to as condition (b).

Further, in the form of the guide shown in FIG. 12, the rolling device 501 includes a universal rolling mill 502 having a pair of upper and lower horizontal rolls 502 a and a pair of left and right vertical rolls 502 b and 502 c. A guide 504 is provided at a position along the direction. Each of the vertical rolls 502b and 502c is supported by roll chock 502d and 502e. A pair of scraper guides 503a and 503b for restraining the outer surface of the flange of the H-section steel 505 are disposed on the exit side of the vertical rolls 502b and 502c of the universal rolling mill 502 and inside the roll chock 502d and 502e. It is arranged to extend from. The guide 504 has a pair of side guides 504a and 504b extending from the scraper guides 503a and 503b. And while restraining the flange outer surface of the H-shaped steel 505 after rolling with the scraper guides 503a and 503b and the side guides 504a and 504b (actually, each scraper guide 503a, 503b, 504a, 504b and the H-shaped steel 505 Rolling is performed with a gap of S ₆ between them. The scraper guide 503a, 503b and the side guides 504a, the total length of 504b L ₉ has a 2m. Hereinafter, the form of the guide shown in FIG. 12 is referred to as condition (c).

In this experiment, a difference of about 1% is applied to the left and right flange thickness reduction ratios of the H-shaped steels 306, 404, and 505, and bending is forcedly generated by rolling by the universal rolling mills 302, 402, and 502, and the gap S _4, S _5, was to evaluate the effect of correcting the bend and adjust the S _6. The gaps S ₄ , S ₅ , S ₆ are respectively set to the same horizontal position as the peripheral surface of the vertical rolls 302b, 302c, 402b, 402c, 502b, 502c of the universal rolling mills 302, 402, 502 as a reference: 0, When the vertical rolls 302b, 302c, 402b, 402c, 502b, and 502c are located outside (in a direction away from the material), they are defined as positive. In addition, the left and right guides were set at symmetrical positions for each condition.

FIG. 13A shows the relationship between the setting guide position and the total bending amount, and FIG. 13 shows the relationship between the setting guide position and the local bending amount, with respect to the guide forms in the conditions (a), (b), and (c). Shown in (b). The setting guide position corresponds to the gaps S ₄ , S ₅ , S ₆ . Further, in FIG. 6A, the total bending amount is the deformation amount δ of the most bent portion of the H-shaped steel with the total length L = 10 m, and the local bending amount is 1.5 m from the end of the H-shaped steel. Is the deformation amount δ of the most bent portion. The local bending amount is evaluated at both ends of the H-section steel, but the deformation amount δ is obtained by the same method as the total bending amount with the position 1.5 m from the end of the H-section steel as a virtual end portion. As shown in FIG. 6 (a), the deformation amount δ is positive when the H-shaped steel is bent to the left and the most bent portion is indented to the right with respect to the end, and the H-shaped steel is bent to the right and bent most. Negative if the part is dented to the left with respect to the edge. The target range of the total bending amount at 10 m is within 1/1000 = 10 mm of the product length as per JIS standard (JIS G3136, 3192), and the target range of the local bending amount at 1.5 m is 1 mm here.

In the form of the guide of the condition (a), as shown in FIG. 13B, it is bent at the tip of the H-shaped steel 306 regardless of the set guide position of the roller guides 303a, 303b, 304a, 304b, 305a, 305b. Has been found to occur easily. That is, even when adjusting the clearance S ₄ in any 0～3Mm, local curve amount is greater than the target range 1 mm. This is because the bending correction force does not work until the tip of the H-shaped steel 306 that has been bent by rolling reaches the first roller guides 303a and 303b. In addition, when the tip of the H-shaped steel 306 reaches the first roller guides 303a and 303b, a bending correction force acts in a direction opposite to the direction of the bending suddenly generated by rolling, so a local S-shape. It has also been found that bending tends to occur. Further, the correction effect on the entire bending is small, and as shown in FIG. 13A, the entire bending amount of the H-section steel 306 is also independent of the set guide positions of the roller guides 303a, 303b, 304a, 304b, 305a, 305b. The target range of 10 mm is exceeded.

Further, even in the guide form of the condition (b), the correction effect on the entire bending is small, and as shown in FIG. 13A, the gap S _{5 is set} to 0 regardless of the set guide position of the scraper guides 403a and 403b. Even if it adjusts to any of -3mm, the total bending amount of the H-section steel 404 exceeds 10 mm of a target range. Also, smaller straightening effect on the local curvature, as shown in FIG. 13 (b), the roller guide 303a, 303b, 304a, 304b, 305a, regardless of the setting guide position of 305b, i.e. the clearance S ₅ of 0~3mm Regardless of the adjustment, the local bending amount of the H-section steel 404 exceeds the target range of 1 mm.

For these conditions in the case of the guide form of (c) has a large correction effect against bending and local bending entire scraper guide 503a, 503b and the side guides 504a, setting guide position of 504b, that is, the gap S ₆ If it is 1 mm or less, as shown in FIGS. 13 (a) and 13 (b), the entire bending amount of the H-section steel 505 can be set to 10 mm or less of the target range, and the local bending amount of the H-section steel 505 is set to the target range. It was found that it can be made 1 mm or less.

Next, with respect to the condition (c) in which the bending correction effect was good, the total length L ₉ of the scraper guides 503a and 503b and the side guides 504a and 504b was changed to change the correction effect of the local bending. investigated. In this investigation, the gap S ₆ was fixed to 1 mm. FIG. 14 shows the relationship between the length of the guide and the amount of local bending, which is the investigation result. As shown in FIG. 14, the scraper guide 503a, the 503b and scraper guide 504a, the total length L ₉ of 504b becomes longer, improves the effect of correcting the local curvature, the target range local bending of the product front end 1.5mm It has been found that the total length L ₉ of the scraper guides 503a and 503b and the side guides 504a and 504b should be 1.5 m or more so as to be within 1 mm.

The present invention has been made based on these findings and further studies.
That is, in the universal rolling method of a section steel according to claim 1 of the present invention, a section steel having a web and a flange provided at the left and right ends of the web by a pair of upper and lower horizontal rolls and a pair of left and right vertical rolls. A universal rolling mill for rolling, and constrains the outer surface of the flange of the shaped steel, which is arranged on the inner side of a roll chock so as to extend from the exit side of the vertical roll of the universal rolling mill to the exit side of the roll bite by the vertical roll. A pair of first guides, and a pair of second guides, which are arranged on the exit side of the pair of first guides so as to extend continuously from the first guide and restrain the flange outer surface of the shape steel. comprising the door, with the first guide and the universal rolling mill of the second guide section steel total length of the rolling direction is 1.5m or more, of the first guide and the shaped steel The gap between the flange outer surface and 0.5 to 1 mm, the gap between the second guide and the flange outer surface of the shaped steel as 0 to 1 mm, is characterized by rolling said section steel.

Moreover, the universal rolling method of the section steel which concerns on Claim 2 among this invention is set to the invention of Claim 1, Each of the said 2nd guide is comprised by the some roller, It is characterized by the above-mentioned.
Furthermore, in the universal rolling method of a section steel according to claim 3 of the present invention, in the invention according to claim 2, each of the second guides is configured by arranging a guide plate between the adjacent rollers. It is a feature.

According to the universal rolling method for section steel according to claim 1 of the present invention, a pair of first guides for restraining the outer surface of the flange of the section steel is provided on the outlet side of the vertical roll of the universal rolling mill. A pair of second guides, which are arranged inside the roll chock so as to extend from the immediate vicinity of the exit, and restrain the flange outer surface of the shape steel on the outlet side of the pair of first guides, are continuously provided following the first guide. Since the shape steel is rolled with the first guide and the second guide constraining the outer surface of the flange of the shape steel, the bending in the left-right direction of the shape steel caused by rolling extends from the nearest position of the roll bite. It can be constrained by the first guide and the second guide extending continuously from the first guide, and not only the entire bending of the shape steel in the left-right direction, but also the local bending of the tip of the shape steel. It can be positive. And even if there is a slight error in the gap between the first guide and the second guide and the flange outer surface of the structural steel, it is possible to expect a straightening effect of bending. Therefore, strict setting accuracy of the guide that constrains the outer surface of the flange of the structural steel is required. Never.
Moreover, since the total length of the first guide and the second guide in the rolling direction is 1.5 m or more, the local bending of the tip of the H-section steel can be more effectively corrected.

According to the universal rolling method for shape steel according to claim 2 of the present invention, since each of the second guides is composed of a plurality of rollers, each of the second guides is configured with a simple configuration. be able to.
Furthermore, according to the universal rolling method for shape steel according to claim 3 of the present invention, each of the second guides is configured by installing guide plates between adjacent rollers. Can be prevented by the guide plate, and the local bending of the tip of the section steel can be more effectively corrected than when each of the second guides is constituted by a plurality of rollers.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view schematically showing a rolling apparatus to which the universal rolling method according to the present invention is applied. FIG. 2 is a partially enlarged plan view of the universal rolling mill and the universal rolling guide in the rolling apparatus of FIG. FIG. 3 shows the rolling apparatus of FIG. 1, (a) is a side view, and (b) is a cross-sectional view taken along the line A-A ′ in (a). However, in FIG. 3, the vertical roll chock, the housing, and the like are omitted.

A rolling apparatus 1 shown in FIGS. 1 to 3 includes a universal rolling mill 2 that rolls a web and an H-section steel 10 provided on the left and right ends of the web, and a universal rolling guide disposed on the exit side of the universal rolling mill 2. 3.
And the universal rolling mill 2 has a pair of upper and lower horizontal rolls 2a, 2a and a pair of left and right vertical rolls 2b, 2c. With these horizontal rolls 2a, 2a and vertical rolls 2b, 2c, FIG. 1 and FIG. The H-section steel 10 conveyed in the direction of the arrow is produced by rolling. Here, the left vertical roll 2b is supported by a chock 2d attached to the housing 2f, while the right vertical roll 2c is supported by a chock 2e attached to the housing 2f.

  In addition, the universal rolling guide 3 is provided on the exit side of the vertical rolls 2b and 2c of the universal rolling mill 2 by the roll bite exits of the vertical rolls 2b and 2c (center positions of the vertical rolls 2b and 2c in the longitudinal direction of the H-section steel 10). The first guides 4a and 4b, which are arranged so as to extend from the nearest position and restrain the flange outer surface of the H-shaped steel 10, and the first guides 4a and 4b on the exit side of the pair of first guides 4a and 4b. 4a, 4b, and a pair of second guides 5a, 5b, which are arranged so as to continuously extend, and restrain the flange outer surface of the H-section steel 10.

Each of the first guides 4a and 4b is attached to each of the chocks 2d and 2e of the vertical rolls 2b and 2c. The length from the roll bite outlet of each of the first guide 4a, 4b are set to L _1. By arranging each of the first guides 4a and 4b so as to extend from the vicinity of the roll bite outlet, the left and right flanges of the H-section steel 10 in the vicinity of the roll bite outlet can be easily restrained. In the present embodiment, each of the first guides 4a and 4b is constituted by a scraper guide that removes foreign matters such as scales attached to the surfaces of the vertical rolls 2b and 2c. The pair of first guide 4a, 4b, as shown in FIG. 2, between the flange outer surface of the H-shaped steel 10 is disposed such that the clearance S _2. This gap S _2, it is preferably about 0.5 to 1 mm. If the clearance S ₂ is smaller than 0.5 mm, the flange outer surface first guides 4a of H-beam 10, will be able to scratch the flange outer surface of the H-shaped steel 10 hit the 4b, while, the clearance S ₂ is If it is larger than 1 mm, local bending of the tip of the H-section steel 10 cannot be effectively suppressed.

Each of the second guides 5a and 5b includes a plurality (three in this embodiment) of rollers 6a and 6b and a plurality of (in this embodiment) arranged between the adjacent rollers 6a and 6b. Is composed of two guide plates 7a and 7b. Then, the first roller 6a in the present embodiment, 6b set position of the distance from the roll bite outlet rollers 6a, to the center position of 6b is set to L _2, the first roller 6a, and 6b center position of the second roller 6a, the distance between the center position of 6b is set to L _3, also the second rollers 6a, 6b of the center position and the third roller 6a, the distance between the center position of 6b There has been set to L _4. The rollers 6a and 6b and the guide plates 7a and 7b are supported by support plates 8a and 8b, respectively, and the support plates 8a and 8b are attached to cylinders 9a and 9b fixed to the housing 2f, respectively. The cylinders 9a and 9b are configured to advance and retract the rollers 6a and 6b and the guide plates 7a and 7b with respect to the flange outer surface of the H-shaped steel 10 via the support plates 8a and 8b, respectively. The clearance S ₁ between the outer surface of the flange 10 and the clearance S ₃ between the guide plates 7a and 7b and the outer surface of the flange can be adjusted. The gap S ₁ is preferably about 0 to ₁ mm. If the gap S ₁ is larger than ₁ mm, the bending of the H-section steel 10 cannot be effectively suppressed. The gap S ₃ is preferably slightly larger than the gap S ₁ between the rollers 6a and 6b and the flange outer surface of the H-section steel 10, for example, about 0.5 mm. By making the gap S ₃ slightly larger than the gap S ₁ , wrinkles on the flange outer surface of the H-section steel 10 can be prevented.

And when rolling the H-section steel 10 with the rolling apparatus 1, the H-section steel 10 is rolled while restraining the flange outer surface of the H-section steel 10 with the first guides 4a and 4b and the second guides 5a and 5b.
In this rolling, the first guides 4a, 4b and the second guides 5a, 5b extending continuously from the first guides 4a, 4b and the first guides 4a, 4b are bent in the left-right direction of the H-section steel 10 generated by rolling. It is possible to restrain not only the entire bending of the H-shaped steel 10 in the left-right direction but also the local bending of the tip of the H-shaped steel 10. And even if there is a slight error in the gap between the first guides 4a and 4b and the second guides 5a and 5b and the flange outer surface of the H-shaped steel 10, the effect of correcting the bending can be expected. Strict setting accuracy of the constraining guide is not required.

  In addition, each of the second guides 5a and 5b includes a plurality (three in this embodiment) of rollers 6a and 6b and a plurality of (in this embodiment) disposed between adjacent rollers 6a and 6b. Is composed of two guide plates 7a and 7b, so that the phenomenon that the tip of the H-section steel 10 bends between the adjacent rollers 6a and 6b can be prevented by the guide plates 7a and 7b. The local bending of the tip of the H-section steel 10 can be more effectively corrected than when each of the two guides 5a and 5b is configured by only a plurality of rollers 6a and 6b.

Also, the total length L in the rolling direction of the first guides 4a, 4b and the second guides 5a, 5b (the centers of the last rollers 6a, 6b from the roll bite outlet, the third rollers 6a, 6b in this embodiment) the distance to the position) in order to correct the curvature of localized at the tip portion of the H-beam 10 more effectively, you and 1.5m or more.
As mentioned above, although embodiment of this invention has been described, this invention is not limited to this, A various change and improvement can be performed.

For example, what is rolled by the rolling apparatus 1 shown in FIGS. 1 to 3 is not only the H-shaped steel 10 but also webs of thin steel and I-shaped steel, and flanges provided at the left and right ends of the web. Any shape steel may be used.
Further, the first guides 4a and 4b do not need to be scraper guides as long as they restrain the flange outer surface of the shape steel such as the H-section steel 10.

As a configuration in which the guide plates 7a and 7b are disposed between the first guides 4a and 4b and the adjacent rollers 6a and 6b, as shown in FIG. 4A, the first guides 4a and 4b and the guide plate 7a are arranged. 7b may be integrated.
Further, each of the second guides 5a and 5b may be configured by only a plurality of rollers 6a and 6b without arranging a guide plate as shown in FIG. 4B. In this case, each of the second guides 5a and 5b can be configured with a simple structure.

  Further, the number of each of the rollers 6a and 6b is not limited to three, and may be two or more from the viewpoint of preventing wrinkles on the flange outer surface of the shape steel such as the H-section steel 10.

The H-section steel having the dimensions shown in FIG. 5 (nominal dimensions H900 × 300 × 16 × 28) was rolled using the rolling apparatus 1 shown in FIGS. 1 to 3 (example of the present invention). For comparison, the same H-section steel was rolled using a conventional rolling apparatus 301 shown in FIG. 10 (comparative example).
In the example of the present invention, the length L ₁ from the roll bite outlet of each of the first guides 4a and 4b is 0.7 m, and the first rollers 6a and 6b have a length L1 from the roll bite outlet to the center position of the rollers 6a and 6b. The distance L ₂ is 0.8 m, the distance L ₃ between the center position of the first rollers 6a and 6b and the center position of the second rollers 6a and 6b is 0.5 m, and the center of the second rollers 6a and 6b. position and third rollers 6a, the distance L ₄ between the center position of 6b is 0.5 m, the first guide 4a, 4b and the second guide 5a, the total length L of the rolling direction of 5b to 1.8m did. Further, the clearance S ₁ between the rollers 6a, 6b and the flange outer surface of the H-shaped steel is 0 mm, the clearance S ₂ between the first guides 4a, 4b and the flange outer surface of the H-shaped steel is 0.5 mm, and the guide plates 7a, 7b The gap S ₃ with the outer surface of the flange of the H-shaped steel was initially set to 0.5 mm, and the gap S ₂ and the gap S ₃ were appropriately adjusted according to the occurrence of bending.

In the comparative example, the distance L ₅ from the roll bite outlet to the center position of the first roller guides 303a and 303b is 1.5 m, the center position of the first roller guides 303a and 303b, and the second roller guides 304a and 304b. distance L ₆ between the center position of 1.0m, 2 th roller guide 304a, the center position and the third roller guides 305a of 304b, the distance L ₇ between the center position of 305b to 1.0m did. Further, the gap S ₄ between the roller guides 305a and 305b and the outer surface of the flange of the H-shaped steel was initially set to 0 mm, and the gap S ₄ was appropriately adjusted according to the occurrence of bending.

  For each of the inventive examples and comparative examples, 20 rolls were performed, and the occurrence of the entire bending and local bending of the H-section steel was investigated. The results are shown in Table 1.

  In Table 1, the case where the H-shaped steel is bent to the left and the most bent portion is indented to the right with respect to the end is positive, the H-shaped steel is bent to the right and the most bent portion is indented to the left with respect to the end. Case is negative. Table 1 shows an average value, a standard deviation 1σ, a maximum value, and a minimum value of 20 products of the total bending amount and the local bending amount.

  Referring to Table 1, in the example of the present invention, the average value of both the total bending amount and the local bending amount of the H-section steel is small, and the standard deviation, the maximum value and the minimum value (absolute value) are small compared to the comparative example. It was good. On the other hand, in the comparative example, the standard deviation, the maximum value and the minimum value (absolute value) of the local bending amount at the tip portion of the H-section steel are large, and the standard deviation and the maximum of the entire bending amount of the H-section steel. The value and the minimum value (absolute value) were large.

In the examples of the present invention, there was no occurrence of oysters or the like that would cause a problem on the outer surface of the flange of the H-shaped steel.
Moreover, in the example of this invention, although H-section steel is rolled, it has confirmed that the bending of thin-shaped steel and I-shaped steel can also be corrected by the same method.

It is a top view which shows typically the rolling apparatus with which the universal rolling method which concerns on this invention is applied. It is the top view which expanded the universal rolling mill and the universal rolling guide in the rolling apparatus of FIG. 1 partially. 1 shows the rolling device of FIG. 1, (a) is a side view, and (b) is a sectional view taken along the line A-A ′ in (a). However, in FIG. 3, the vertical roll chock, the housing, and the like are omitted. It is a top view which shows typically the modification of the guide for universal rolling. It is sectional drawing of the H-section steel rolled and manufactured by the Example. It is a figure which shows the bending and curvature which generate | occur | produce at the time of rolling of H-section steel. It is a top view which shows an example of the conventional rolling apparatus. It is a top view which shows the other example of the conventional rolling apparatus. It is a figure for demonstrating the phenomenon example which cannot fully restrain the front-end | tip part of H-section steel in the rolling apparatus shown in FIG. It is a figure which shows typically the guide form of conditions (a). It is a figure which shows typically the guide form of conditions (b). It is a figure which shows typically the guide form of conditions (c). The relationship between the set guide position and the amount of bending with respect to the guide form in the conditions (a), (b), and (c) is shown. (A) is a graph showing the relationship between the set guide position and the total amount of bending. b) is a graph showing the relationship between the setting guide position and the amount of local bending. It is a graph which shows the relationship between the length of a guide and the amount of local bending about the guide form in condition (c).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling apparatus 2 Universal rolling mill 2a Horizontal roll 2b, 2c Vertical roll 2d, 2e Chock 2f Housing 3 Universal rolling guide 4a, 4b 1st guide 5a, 5b 2nd guide 6a, 6b Roller 7a, 7b Guide plate 8a, 8b Support plate 9a, 9b Cylinder 10 H-section steel

Claims (3)

A universal rolling mill for rolling a section steel having a web and a flange provided at the left and right ends of the web by a pair of upper and lower horizontal rolls and a pair of left and right vertical rolls,
A pair of first guides, which are disposed on the inner side of the roll chock so as to extend from the exit side of the vertical roll of the universal rolling mill so as to extend from the immediate vicinity of the roll bite exit by the vertical roll,
A pair of second guides, which are disposed on the exit side of the pair of first guides, and are arranged so as to extend continuously following the first guide, and restrain the flange outer surface of the shape steel;
Using a universal rolling mill of a section steel whose total length in the rolling direction of the first guide and the second guide is 1.5 m or more ,
The gap between the first guide and the flange outer surface of the section steel is 0.5 to 1 mm,
A method for universal rolling of section steel , wherein the section steel is rolled with a gap between the second guide and the flange outer surface of the section steel being 0 to 1 mm . 2. The method for universal rolling of section steel according to claim 1, wherein each of the second guides comprises a plurality of rollers. The method for universal rolling of section steel according to claim 2, wherein a guide plate is installed between the adjacent rollers to constitute each of the second guides.

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