JPH0747401A - Method and equipment train for shape with flange - Google Patents

Abstract

PURPOSE:To execute a comparatively large reduction of web height of a stock to be rolled without changing a roll tool, and also, to provide a product of a high quality being free from web buckling, center offset, and an overlapping flaw of a fillet part, etc. CONSTITUTION:At the time of reducing web height by a horizontal roll barrel width universal rolling mill in a finish rolling process of a steel shape, an excess metal 18 is formed in both end peripheral parts of a web by providing a recessed part 19 on both left and right end surfaces of upper and lower horizontal rolls 2H of a universal rolling mull RU in an intermediate rolling process 2. Subsequently, the excess mertal 18 is subjected to rolling reduction adjustment by an excess metal rolling reduction device YS of a universal type or a two-high type so that web projection contact length and flange projection contact length always becomes equal to each other in accoodance with the reduction amount of web height by a finish universal mill FU.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flanged profile, such as H-section, channel profile and similar metallic or non-metallic profiles, in particular H-section, for efficient web height relief. The present invention also relates to a method for freely making different parts and a rolling apparatus train thereof.

[0002]

2. Description of the Related Art Universal rolling mills are mainly used for rolling shaped steel products having a flange, for example, H-shaped steel.
As shown in FIG. 7, in the conventional rolling method, since the horizontal roll 2H having the same body width is used in the same series, the web inner width WB of the H-section steel becomes constant, and when the flange thickness tF is different, the web is correspondingly changed. Since the height W changes, the heights of the webs in the same series are different. When such rolled H-section steels are joined together to form a beam for a building structure, the outer surfaces of one flange are usually aligned with each other, so that a deviation of twice the flange thickness occurs in the other, which is inconvenient for construction. Further, the coating thickness of the steel-framed reinforced concrete varies depending on the size, which is inconvenient in design. Therefore, the conventional rolling H
Shaped steel may not be easy to use depending on the application such as building pillars and beams, beams and beams, and pillars and columns splicing. There has been a strong demand for the production of shaped steel.

To meet this demand, Japanese Patent Publication No. 1-472
No. 41 and Japanese Unexamined Patent Publication No. 2-60001, H
As one of means for adjusting the web height of shaped steel within the same roll chance, a rolling method for reducing the web height of the intermediate rolled material after rough universal mill rolling in the finish rolling step, so-called web height reduction rolling method is disclosed. ing.

In this web height reduction rolling method, a finishing universal rolling machine having a pair of upper and lower horizontal rolls and a pair of left and right vertical rolls having variable roll widths is arranged, and H-section steel is rolled by the rolling mill. The horizontal roll body width is set smaller than the inner width of the H-section steel, and the gap between the vertical roll and the side of the horizontal roll (vertical roll gap) is set according to the product flange thickness. This is a rolling method in which the web height of the profile is adjusted by reducing the web equivalent part of the strip from the width direction. This rolling means is a practical means capable of easily adjusting the web height of the profile with relatively inexpensive equipment investment. But,
Since the ratio (thinness ratio) of the thickness tw to the inner width WB of the web portion is relatively large, when the amount of reduction of the inner width of the web is large, the web easily buckles as shown in FIG. Is preceded by the restraint of the material to be rolled by the horizontal rolls, the action of guiding the material to the regular position by the horizontal rolls is reduced, and in synergy with the buckling of the web described above, FIG.
There is a problem that the center deviation e of the web becomes very large like 0. Recently, with the progress of labor saving and automation at the construction site, the dimensional accuracy of rolled H-section steel, which is a member, has been improved.
Particularly, it is required to improve the accuracy of the center deviation of the web, and the increase of the center deviation e is a serious problem.

This center deviation e improves the guiding accuracy of the material to be rolled to the finishing universal rolling mill by devising the structure of the guide, and adjusts the flange reduction ratio in the finishing universal rolling mill to devise the overall stretching balance. By
Although it can be improved to some extent, the reduction amount of the web height cannot be increased so much in practice due to the basic mechanism of forming. Against this background, as inventions proposed to change the molding mechanism, JP-A-3-94903, JP-A-3-216201, and JP-A-3-216903 have been proposed.
Each means described in Japanese Patent No. 268802 has been proposed.

Japanese Unexamined Patent Publication (Kokai) No. 3-94903 preforms a fillet portion shape of a material so that a part of a horizontal roll and a material to be rolled are in contact with each other over a portion or an entire area of a predetermined flange projection contact length or more. However, it is described that the center deviation is suppressed by moving the point where buckling occurs when the web is reduced from the fillet portion to the central portion of the web.

The invention described in Japanese Patent Application Laid-Open No. 3-216201 is based on reduction rolling using a material in which the shape of the fillet portion is preformed so that the projected contact length of the web is equal to or longer than the projected contact length of the flange. , To suppress the central deviation. As the horizontal roll of the finishing universal rolling mill, one having a fixed cylinder width or one having an adjustable width is used.

Further, in Japanese Unexamined Patent Publication No. 3-268802, 10 ° ≦ θ ≦ 60 °, R ₁ ≧ r, and R ₂ ≧ r, where θ: the straight portion of the fillet portion with respect to the web surface Formed angle R ₁ : A radius of an arc of a joint between the fillet portion and the inner surface of the flange R ₂ : A material in which a shape of a fillet portion is preformed so as to satisfy an arc radius of a joint between the fillet portion and a web surface. It is disclosed that the center deviation is suppressed by performing reduction rolling by means of. As the horizontal roll of the finishing universal rolling mill, one having a fixed cylinder width or one having an adjustable width is used.

In all of the above-mentioned publications, a horizontal roll is used during the web high reduction rolling in order to suppress the buckling of the web as small as possible and to move the buckling occurrence position from the fillet portion to the central portion of the web. It is proposed to determine the shape of the fillet so that the web restraint range is equal to or longer than the flange projected contact length.

However, when the proper shape of the fillet portion is determined as described above, the web projected contact length becomes extremely longer than the flange projected contact length in the case where the web height reduction amount is small, and the horizontal roll starts to contact the web. During the period from the start of the web height reduction to the start of the web height reduction, the web is independently rolled without the horizontal roll restraint (guide). Therefore, the material is rolled in a very unstable state, the material is flowed to the left or right in extreme cases, the amount of reduction on one side becomes extremely large during the subsequent web height reduction rolling, As shown in FIG. 11, as a result, a fold flaw PL is generated in one of the fillet portions.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the prior art, and enables a relatively large reduction in the web height of a material to be rolled without replacing the roll tool. An object of the present invention is to provide a rolling method of a profile having a flange and a rolling device row thereof, which can be carried out and can produce a high quality product without buckling of the web, deviation of the center, and fold flaws in the fillet portion.

[0012]

The gist of the present invention resides in the rolling method and rolling apparatus train shown below. That is, the rolling method of the present invention is a rolling method for reducing the web height of a profile having a flange in a finish rolling process of a shaped steel rolling process consisting of a rough rolling process, an intermediate rolling process, and a finish rolling process. After forming excess thickness at both ends of the web of the profile by at least one or more universal rolling mills of the above, a flange is provided for adjusting the thickness of the excess thickness by a excess thickness reducing device provided in the preceding stage of the finish rolling step. Rolling method for profiles. A method for rolling a profile having a flange according to the above item, wherein vertical rolls of at least one or more universal rolling mills in the intermediate rolling step are moved to the rolling-out side or rolling-in side to adjust and roll the thickness of the excess thickness. And, in the process of forming the excess thickness at both ends of the web of the profile by the pair of upper and lower horizontal rolls of at least one universal rolling mill in the intermediate rolling process, the ratio of the flange reduction ratio and the web reduction ratio is changed. It is a method of rolling a profile having a flange as described in the above item 1 or 2, which adjusts and rolls the thickness.
Further, the apparatus train of the present invention includes a profile having a flange in which a universal rolling machine with a variable horizontal roll width is arranged in a finish rolling process of a shaped steel rolling process including a rough rolling process, an intermediate rolling process, and a finish rolling process. In the rolling mill train, at least one or more universal rolling mills that form a surplus portion by concave portions formed on each of the left and right circumferential surfaces of the pair of upper and lower horizontal rolls are provided in the intermediate rolling process. Separately, there is provided a rolling mill train for a profile having a flange provided with a surplus wall reduction device for reducing the thickness of a surplus part at a stage before the finish rolling process, and at least one or more universal rolling mills in the intermediate rolling process. Is a rolling apparatus train for a profile having a flange as described in the above item, which has a vertical roll whose position can be changed to the rolling exit side or the rolling entrance side.

[0013]

The method of the present invention and the apparatus sequence for carrying out the method of the present invention will be described in more detail below with reference to FIGS. 1 (a) and 1 (b) show typical examples of rolling mill trains provided by the present invention. FIG. 1A shows a rough rolling machine BD in a rough rolling step 1 for supplying a beam blank 4, which is used to roll the beam rank 4 into a substantially H shape and to form a surplus thickness 18 at both ends of the web 2a. Recessed portion (cutout portion) 19
Horizontal rolls 2 formed on both the left and right peripheral surfaces
Universal rolling mill RU of intermediate rolling step 2 having H,
The edger rolling machine E of the intermediate rolling step 2 for forming the width F of the flange portion 1a, the excess thickness reduction device YS for reducing the thickness of the excess thickness 18, and the finishing rolling step 3 having the horizontal roll having the body width varying mechanism. It is an apparatus train constituted by a finish universal rolling mill FU. As the surplus wall reduction device YS, a universal type or double type rolling device can be used.

FIG. 1B shows a rough rolling machine BD in a rough rolling step 1 for supplying a beam rank 4, the beam blank 4 is rolled into a substantially H shape, and a surplus thickness 18 is formed at both ends of the web 2a. Upper and lower horizontal rolls 2H having recesses (notches) 19 formed on the left and right peripheral surfaces,
A universal rolling mill RU in the intermediate rolling process 2 having a vertical roll 2V having a mechanism for changing the position to the rolling out side or the rolling in side, an edger rolling device E in the intermediate rolling process 2 for forming the width F of the flange portion 1a, It is a device row constituted by a surplus wall reduction device YS for adjusting the thickness of the surplus wall 18 and a finish universal rolling mill FU in a finish rolling step 3 having a horizontal roll having a cylinder width varying mechanism. However,
In (a) and (b), the case where the universal type surplus thickness reducing device YS is installed between the universal rolling mill RU and the finish universal rolling mill FU is illustrated.

Next, a rolling method of the present invention using the above-described rolling apparatus train will be described. The basic idea of the present invention is to reduce the thickness of the excess thickness portion before the finish rolling step so that the projected web contact length and the projected flange contact length are the same for all reduction amounts of the web height. . this is,
In the conventional rolling method, the web projection contact length becomes extremely longer than the flange projection contact length depending on the reduction amount of the web height due to fixing the shape of the fillet portion (corresponding to the excess thickness portion in the present invention). It becomes a very unstable state, and there is a problem in that the fillet portion is broken and a flaw occurs. Hereinafter, a method for adjusting the thickness reduction of the excess thickness portion and an appropriate shape of the excess thickness portion based on the above basic concept will be described.

FIGS. 2 (a) and 2 (b) schematically show the web height reduction rolling state by the finish universal rolling mill FU.
In this figure, the web projection contact length Lw is generally (1)
It can be expressed by a formula.

[Equation 1] Further, the flange projected contact length Lf can be expressed by equation (2).

[Equation 2] Under the condition of Lw = Lf, the required amount of excess wall thickness reduction can be expressed by the following equation (3). Δtw = ΔWr · Rv / RH ……………………………… (3)

The margin reduction Δtw is the web height reduction amount ΔW.
It depends on r. Therefore, the surplus portion is formed by the following method so that the formula (3) is always satisfied for all the web height reduction amounts ΔWr. First, the maximum reduction amount ΔWrmax
Maximum margin reduction Δtwmax (calculated from equation (3))
In order to obtain sufficient thickness, the extra thickness is formed at both ends of the web by the universal rolling machine in the intermediate rolling process. At this time, the recessed amount (notch) provided on the left and right circumferential surfaces of the upper and lower horizontal rolls of the universal rolling machine has a maximum of Δtwmax /
Set to 2. Next, when the reduction amount is smaller than ΔWrmax, the excess thickness formed by the universal rolling mill in the intermediate rolling process is adjusted by the excess thickness reduction device using the separately provided universal type or double type rolling device. Adjust the reduction. That is, in the intermediate rolling process, Δt from the center of the web
Using a rolling device with only the web edges that are thickened by wmax and provided separately, one pass or multiple passes (Δtwmax-Δt
wi) just down. However, Δtwi is the required reduction amount ΔW
It is the required amount of excess reduction calculated by substituting ri into equation (3). By performing such rolling, as shown in FIG. 3, with the start of the reduction rolling of the web height by the vertical rolls,
Rolling down of the excess part by a horizontal roll is started, and web height reduction rolling is performed while restraining the web, and the web does not buckle. Further, since there is no region where the web is independently rolled, the horizontal deviation of the rolled material does not occur. As a result, it is possible to stably manufacture a good product which has a smaller center deviation than the conventional method and does not have a flaw in the fillet portion.

Next, the proper shape of the extra thickness portion will be described. First, by changing the radius R of the fillet,
Consider the case where Δtw is controlled to make the web projected contact length equal to the flange projected contact length. The geometrical positional relationship between the roll and the material to be rolled in this case is shown in FIG. Using the symbols in the figure, the radius R of the fillet portion can be expressed by equation (4).

[Equation 3] For example, if ΔWr = 30 mm, then from equation (3), Δ
tw is 21.4 mm (however, RH = 1400 mm, Rv =
1000 mm), and R is 43.6 mm from the equation (4).

Next, the geometrical relationship between the roll and the material to be rolled when the outer shape is provided with a surplus consisting of a fillet portion and a flat portion to make the projected contact length of the web and the projected contact length of the flange equal to each other. As shown in FIG. In this case, since the horizontal roll and the flat portion of the excess thickness first come into contact with each other, the radius R of the fillet portion does not need to be specially specified and is set to a conventional value. However, the shape of the flat portion needs to be specified as follows. That is, the surplus portion thickness is set such that the surplus portion reduction amount Δtw satisfies the expression (3), and the width u of the surplus portion is set so as to satisfy the expression (5).

[Equation 4]

In addition, a surplus portion shape obtained by combining a plurality of arcs is also conceivable. Also in this case, if the radius R of the circular arc is defined from the expressions (3) and (4), the web projection contact length and the flange projection contact length can be basically made equal. However, in the case of a surplus part shape consisting of one or more arcs, it is necessary to change the horizontal rolls of the special rolling device when adjusting the surplus part thickness, so the web height can be adjusted without changing the rolls. It does not meet the purpose of the present invention. Therefore, in the present invention, by mainly adopting the shape of the excess thickness portion shown in FIG. 5 and changing the gap between the upper and lower horizontal rolls δt of the excess thickness reduction device YS for adjusting the thickness of the excess thickness portion as shown in FIG. The thickness twy of the extra thickness portion is adjusted by rolling.

In addition, in the surplus forming rolling by the universal rolling mill in the intermediate rolling step, a method of moving the vertical roll of the universal rolling mill to the rolling-in side or the rolling-out side, or the flange draft and the web draft. The amount of surplus may be roughly adjusted by a method of changing the ratio. This utilizes the fact that the steel material flow from the flange to the web can be controlled by moving the vertical roll to the rolling-in side or the rolling-out side, or by changing the ratio of the flange draft and the web draft. As a result, the amount of steel material that fills the recesses on the left and right peripheral surfaces of the upper and lower horizontal rolls of the universal rolling mill, that is, the amount of surplus, is changed.

[0022]

[Embodiment] Specifically, H with a constant web height within the series
When manufacturing shaped steel, the inner web width is constant for all sizes up to the intermediate rolled material shaped in the intermediate rolling process,
Based on the web height of the thinnest flange thickness in the intermediate rolled material, for the flange thickness larger than that,
The web height is reduced by a predetermined reduction amount (twice the difference between the flange thickness of the target material and the flange thickness of the reference material). This reduction of web height is performed by using a finishing universal rolling machine in which the horizontal width of the cylinder is variable. That is, the cylinder width of the horizontal roll is set narrower by a predetermined reduction amount than a reference value, and when the intermediate rolled material is rolled by a finish universal rolling mill, the vertical roll is pressed down in the web height direction to reduce the web height. Is adjusted to the required size.

In the following, product designation series H550 × 2
An example in which the present invention is applied to rolling an H-shaped steel having a constant web height of No. 00 will be described. Figure 1 shows the rolling mill train.
(B) was used. First, the web thickness and flange thickness are (6 mm x 9 mm), (6 mm x 12 mm), (6 mm x 16 m), respectively.
m), (9mm × 16mm), (9mm × 19mm), (9mm ×
22mm), (12mm × 16mm), (12mm × 19mm),
Intermediate rolled materials corresponding to product sizes of (12 mm × 22 mm) and (12 mm × 25 mm) were rolled to a required thickness in the intermediate rolling step 2. At this time, the extra thickness 18 was also formed at both ends of the web 2a of the intermediate rolled material by the upper and lower horizontal rolls 2H having concave portions formed on the circumferential surfaces on both the left and right sides. As for the shape of the extra thickness 18, the shape shown in FIG. 5 is adopted, and the maximum value Δtwmax of the extra thickness to be reduced by the finishing universal rolling mill is obtained by the equation (3) (the web height reduction amount is given by the equation (3)). (Calculated by substituting the maximum value ΔWrmax of the above), and the width u thereof is such that the above equation (5) is established. Here, among the above target sizes, the reference size is (6 mm × 9 mm), and the largest web height reduction amount is (12 mm × 25 mm). Therefore, the maximum web height reduction amount ΔWrmax is , (Flange thickness difference) × 2 = (25-9) × 2 = 32 mm. Therefore, the maximum value of the excess thickness reduction is ΔWrmax × Rv / RH = 3
It is 2 × 1000/1400 = 22.9 mm. Further, the extra thickness width u is ΔWrmax / 2 = 32/2 = 16 from the equation (5).
Since it suffices if it is not less than mm, it is set to 20 mm. In addition, as the excess thickness u increases, the load that acts on the horizontal rolls when the excess pressure is reduced by the finishing universal rolling mill increases, and it becomes difficult to erase the excess thickness. Should not be too big.

Next, the web height of the intermediate rolled material thus formed was reduced by a finishing universal rolling mill. For the size (12 mm x 25 mm), the intermediate rolled material formed as described above in the intermediate rolling process is used as it is, and the horizontal roll width is 532 mm, which is the standard width, and the web height reduction amount is 32 mm.
It was rolled by a finishing universal rolling mill FU in which the gap between the vertical roll and the side of the horizontal roll was set to be 25 mm so that the flange thickness after rolling was 25 mm.

On the other hand, for a size in which the amount of reduction in web height is smaller than the maximum value, the amount of reduction in excess thickness (calculated by the equation (3)) corresponding to the amount of reduction in web height is reduced by the excess thickness reduction device YS. Adjusted, then the horizontal roll cylinder width is set smaller than the reference cylinder width 532 mm by the amount of web height reduction, and the gap between the vertical roll and the horizontal roll side is set according to the desired flange thickness. Rolled with FU. In addition, in the above-described extra thickness reduction device YS, the amount of extra thickness reduction can be adjusted to a desired value regardless of whether it is a double type or a universal type. However, in the case of the double type, since there is no restraint in the web height direction by the vertical rolls, the reduction device YS
Since the web height was expanded when the excess thickness was reduced, the reduction amount of the web height in the finish universal rolling mill FU was increased. Therefore, in this case, when forming the excess thickness 18 at both ends of the web by the universal rolling machine RU of the intermediate rolling step 2, the position of the vertical roll 2V and the ratio of the flange reduction ratio and the web reduction ratio are adjusted, Rolling was performed so that the amount of surplus of the intermediate rolled material was as small as possible. As a result, H-section steel with a constant web height of product designation series H550 × 200 could be produced without changing the rolls. Further, the rolling was extremely stable, the product had a small center deviation due to the buckling of the web, and had a good quality with no residual thickness and no flaws in the fillet.

[0026]

According to the present invention, the web height of a profile having a flange can be reduced without replacing the roll tool, so that the web height can be made constant even if the flange thickness is different in the same series. be able to. Further, it is possible to suppress the deviation of the center of the web and the flaws in the fillet portion, which are feared in the conventional reduction rolling, and it is possible to manufacture a high-quality product.

[Brief description of drawings]

FIG. 1 (a), (b): Schematic view of a rolling apparatus train of the present invention.

2 (a) and (b): Schematic diagrams of a web high reduction rolling condition according to the present invention.

FIG. 3 is a schematic view comparing the conventional rolling method and the present invention with respect to the cross-sectional shape of the material to be rolled after the web height is reduced.

FIG. 4 is a schematic diagram showing a geometrical relationship between a horizontal roll of a finish universal rolling mill and a fillet portion of a material to be rolled.

FIG. 5 is a schematic view showing a geometrical relationship between a horizontal roll of a finish universal rolling mill and a flat portion of a surplus of a material to be rolled.

FIG. 6 is a schematic diagram showing a method for adjusting the thickness reduction of the extra thickness portion.

FIG. 7 is a schematic view showing a conventional universal rolling method.

FIG. 8 is a cross-sectional view showing a product shape of rolled H-section steel.

FIG. 9 is a schematic view showing a defective forming situation in a finish rolling process.

FIG. 10 is a cross-sectional view showing the product shape of rolled H-section steel in which dimension / shape defects occur.

FIG. 11 is a schematic view showing a defective rolling situation in the finish rolling process.

[Explanation of symbols]

 1 rough rolling process 2 intermediate rolling process 3 finish rolling process 4 beam blank 18 surplus 19 recessed portion BD rough rolling machine RU universal rolling machine E edger rolling machine YS surplus thickness reduction device

Claims (5)

[Claims] 1. A rolling method for reducing the web height of a profile having a flange in a finishing rolling process of a shaped steel rolling process comprising a rough rolling process, an intermediate rolling process and a finishing rolling process, wherein at least one of the intermediate rolling processes is used. A flange characterized by forming a surplus at both ends of the web of the profile with a universal rolling machine of a base or more, and then adjusting the thickness of the surplus part by means of a surplus reducing device provided in the preceding stage of the finishing rolling step. A method for rolling a profile having a. 2. The vertical rolling of at least one or more universal rolling mills in the intermediate rolling step is moved to the rolling-out side or the rolling-in side to adjust and roll the thickness of the excess thickness portion. Method for rolling a profile having a flange. 3. The ratio between the flange reduction ratio and the web reduction ratio is changed in the process of forming a surplus at both end portions of the web of the profile by the pair of upper and lower horizontal rolls of at least one universal rolling mill in the intermediate rolling process. The method for rolling a profile having a flange according to claim 1, wherein the thickness of the excess thickness portion is adjusted and rolled. 4. A rolling mill train for a profile having a flange in which a universal rolling mill with a variable horizontal roll width is arranged in a finishing rolling process of a shaped steel rolling process including a rough rolling process, an intermediate rolling process and a finishing rolling process. In the intermediate rolling step, at least one or more universal rolling mills that form a surplus portion by concave portions formed on the left and right peripheral surfaces of the pair of upper and lower horizontal rolls are provided, and finish rolling is performed separately from the universal rolling mill. A rolling mill row for a profile having a flange, characterized by being provided with a surplus thickness reduction device for reducing the thickness of a surplus portion in the preceding stage of the process. 5. In the intermediate rolling step, at least one or more universal rolling mills have vertical rolls whose positions can be changed to the rolling-out side or rolling-in side.
A rolling mill train for a profile having the described flange.