JPH0489102A - Method for rolling continuous joint type shapes - Google Patents

Abstract

PURPOSE:To extremely smoothly bend a flange to the outside by bitting the flange in a mill SKM. CONSTITUTION:An intermediate rolled stock which is rolled by a rough universal mill U and an edger mill E and has various kinds of web thicknesses and a nearly H-shaped section symmetrical to vertical and horizontal center lines is formed by bending its flange part through a flange bending mill SKM outward into an intermediate finish rolled stock 16. This flange bending mill SKM is mounted so that oblique rolls 40a, 40b, 41a, 41b having a nearly trapezoidal section each can be adjusted in width vertically and in the direction orthogonally crossed with rolling direction. The oblique rolls 40a-41b are composed of an upper flange 401, a lower flange 402 and a bent barrel tart 403 between them, the axial center C of this roll is inclined with an axial angle to the surface orthogonally crossed with the horizontal surface in the rolling direction and an inclination angle beta is set to the horizontal surface in the rolling direction.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for forming continuous joint type steel sections by rolling.

(Prior Art) The continuous joint type steel section to which the present invention is directed has the most typical shape as shown in FIG. 7(a). It has a female joint portion 1b having a thickness T and opening in the axial direction of the web. Note that the distance W between the centers of the left and right female joint portions b is referred to as the effective width. Figures (b) and (c) show examples of the product shape of the connecting member 6 having a male joint that fits into the female joint part 1b of the continuous joint type section steel 1, and the shape of the connecting member 6 shown in Figure (b) The connecting member 6 is a simple H-shaped steel with a short flange width, and the connecting member 5 shown in FIG. 3(c) is a joint formed by curving the flange outward to form a male joint when mating with a female joint. This is a deformed H-beam with a larger internal space (room allowance). The cross-sectional shapes of the continuous joint type steel section 1 shown in FIG. 1(a) and the connecting member 6 shown in FIGS. The product size of conventional linear steel sheet piles of similar shapes is generally set for each effective width W1 web thickness Tw and joint part TP, but the product size of the continuous joint type steel sheet pile 1 targeted by the present invention is effective. The width W is series inward, and the web thickness Tw
and the joint part TF are provided in various thickness configurations for various purposes.

The general uses of these continuous joint type steel sections are shown in Figure 8 (a).
, (b) = (c), (d), 2
It is used as a so-called steel box sheet pile in which an H-shaped steel 3 or a plate 5 is welded to the web of a continuous joint type steel section 1 to form a section having an H-shaped cross section. Of these, figure (a)
, (c) is an example of welding H-section steel 3, and (b) of the same figure,
(d) is an example in which the plate 5 is welded;
In a) and (b), a large size H having a wide web equivalent to the effective width W of the continuous joint type section steel is used as the male joint member.
In Figures (c) and (d), a small H-shaped steel 2b with a narrow web is used as a member of the male joint.
is used. Furthermore, in FIG. 8(a), a deformation-preventing reinforcing steel material 4 is used to compensate for the lack of strength of the continuous joint type section steel 2a.

The characteristics of the steel box-shaped sheet piles assembled in this way are: ■ It has excellent cross-sectional performance, so the wall thickness can be reduced, ■ The surfaces of the constituent members are smooth, making it suitable for wall functions, and ■ Concrete. It is easy to form a composite structure with other materials, and its specific uses include continuous walls for earth retention, foundation piles, seismic walls for permanent construction, and deep foundation piles for landslides.

In recent years, amid the active trend of underground space development, increasing the depth of underground space and construction work in urban areas has become mainstream. In construction work carried out in densely populated urban areas, the vibrohammers and other driving machines that were used in the past cannot be used in order to prevent vibrations and noise.

Therefore, there is a strong demand for joint fitability that allows the joints to be smoothly inserted into each other by their own weight without using steel sheet piles hoisted up by a crane or other means such as driving. In other words, it is important to improve the fitability of joints with an emphasis on workability, and to provide a product series with a wide range of cross-sectional performance for the continuous joint type steel section 1, which is the basic component of the steel box-type steel sheet pile mentioned above. This has become an issue. In particular, when constructing a deep underground continuous wall, since the earth pressure is small near the ground, is it okay to make the web thickness TW of the continuous joint type steel section 1 small?When using it underground where the soil pressure increases, Is it necessary to increase the rigidity and strength of the box-shaped steel sheet pile by increasing the web thickness Tw? In this case, the joint portion TF of the joint portion may be increased as the web thickness TW increases, or may be constant, as required. During construction, continuous joint shaped steel sections 1 having different thicknesses and relatively short lengths are successively joined and driven in the longitudinal direction at the construction site, and are continuously laid in the longitudinal direction. On the other hand, the cross-sectional shape and dimensions of the male joint material shown in FIGS. 7(b) and (c) that fit with this are constant over the entire installation length, so
Regardless of the product size, the joint part of the continuous joint type steel section 1 needs to have good fitability with the male joint material.

A common method for producing continuous joint shaped steel sections is the so-called caliber rolling method for conventional straight steel sheet piles, as shown in FIG. In the same figure, the rough shaped steel billet BB is a material made in a blooming factory or a foundry, and this material BB is
13 to 1 to form a product. Since this method is mainly based on the grinding action of the side walls of the upper and lower rolls, the type of each of the holes is a closed hole type (Clo
sedPass) becomes an essential component of the array. For this reason, the free cutting amount of the roll due to wear of the hole shape is large, and the roll consumption rate is high.In addition, large amounts of rolling oil and roll cooling water are required, and if this is insufficient, the shape of the joint part of the product will become unstable. This makes rolling work extremely difficult. Moreover, since there are many holes, a long roll body length is required, and it is difficult to manufacture wide straight steel sheet piles with a large effective width W.

As a solution to this problem, a so-called universal rolling method is disclosed in Japanese Patent Publication No. 47-47784, which is a rolling method that eliminates forming defects by applying direct pressure to the raw material portion that forms the joint. A typical example of this universal rolling method is shown in FIG. 10, and it is possible to manufacture a rectangular billet material SL by performing universal rolling in step 4-1.2.3 in the intermediate rolling section. Furthermore, as disclosed in Japanese Patent Publication No. 58-38241, the finishing universal rolling method is also adopted for the finishing hole mold 1, and the hole width of the left and right joints is regulated by vertical rolls inserted into the left and right joints. , Means for suppressing variations in hole width of joints are also well known. However, even with this method, relatively deep and complicated holes are required for the upper and lower horizontal rolls, and the above-mentioned problems cannot be solved.

As another measure, the shape of the straight steel sheet pile was changed to a product shape that is easier to roll, and improvements were made so that it could be rolled using so-called universal rolling equipment for H-section steel and by means similar to the rolling method for H-section steel. There is a way. The technique described in Japanese Patent Publication No. 55-11921 shown in FIG. 11 and the technique described in Japanese Patent Application Laid-open No. 551913 shown in FIG. has been solved, but it is aimed at manufacturing straight steel sheet piles of a specific size.

As described above, when applying the conventional rolling method for straight steel sheet piles, the different web thicknesses Tw have to be limited to a very narrow range due to modeling constraints, and moreover, the same roll set can be used to There was a problem in that it was impossible to form a flange width corresponding to the web thickness and to roll a continuous joint type steel section with a constant effective width and a substantially constant width between the jaws.

(Problems to be Solved by the Invention) The present invention is capable of reducing the web thickness Tw without causing problems such as poor joint face shape, bending during rolling, or reduction in roll consumption when manufacturing a continuous joint type section steel by rolling. In addition to making the web into the desired size, it is possible to bend the web extremely smoothly and obtain a continuous joint flat section with a constant width between the jaws. The object of the present invention is to provide a method for rolling forming H-section steel by utilizing the universal rolling equipment row as much as possible and minimizing the installation and modification of rolls and guides.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a rough rolling process equipped with a breakdown mill, an intermediate rolling process equipped with a universal mill and an edger mill,
In a continuous joint type steel rolling method including an intermediate finishing process using a flange bending mill and a finishing rolling process using a finishing mill, the slab material is roughly shaped into a dogbone shape,
This roughly shaped material is rolled by the universal mill and edger mill to form an intermediate rolled material with an H-shaped cross section with a constant inner width of the web part and a predetermined thickness of the web and flange. A flange bending mill is equipped with a pair of upper and lower oblique rolls having a predetermined axis angle with respect to a plane perpendicular to the horizontal plane of the rolling direction, and the width of the intermediately rolled material can be adjusted in a direction perpendicular to the rolling direction. After the flange is curved outward, the spacing between the upper and lower horizontal rolls is adjusted using a finishing mill to shape the web portion to the specified thickness, and the flange portion is shaped into the specified joint shape, with the joint opening width being approximately constant. The gist of this paper is a rolling forming method for continuous joint type steel sections, which is characterized by finishing them in such a manner.

(Operations/Examples) Hereinafter, operations and examples of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of a rolling method in which the present invention is applied to the production of vertically and laterally symmetrical continuous joint shaped steel sections, and FIG. 2 shows an arrangement of rolling equipment for carrying out the method of the present invention.

The breakdown mill BD in the rough rolling process of the present invention is a mill that uses upper and lower horizontal rolls to process a thin slab with a rectangular cross section or a dog-bone-shaped steel piece into a rough shape in the dog-bone shape multiple times as a raw material. . As mentioned above, the rough rolling process in the present invention is a process similar to the rough shaping of a conventionally known H-beam steel section having a flange, and detailed explanation thereof will be omitted.

Next, in the intermediate rolling process, a rough universal mill U and an edger mill E are arranged as shown in the figure, and the rough shaped material has a predetermined web thickness and flange thickness due to the hole type KAL, 3 of the universal U, and Abbreviation H for constant web inner width
It is rolled and shaped into an intermediate rough rolled material 15a with a shaped cross section. Here, the horizontal rolls 20a and 20b of the universal mill U have a flat surface that presses the web surface of the intermediate rough rolled material 15a, and a side surface that contacts the inner surface of the flange at an outward inclination angle θ (approximately 3 to 10
It is preferable to use rolls formed so as to provide a desired web thickness by constraining the inner surface of the flange and adjusting the opening degrees of the horizontal rolls 20a and 20b. That is, the horizontal rolls 20a and 20b have the same profile as the horizontal rolls in a conventional universal mill for H-shape rolling, and can be used in common or diverted.

On the other hand, the vertical rolls 30a and 30b carry intermediate rough rolled material 15.
A roll (hereinafter referred to as a flat vertical roll) whose circumferential surface is almost flat is used to press the flange surface of a, and this flat vertical roll is also used in a conventional finishing universal mill for H-shape rolling. You can also use flat vertical rolls, which are commonly used for cooking. That is, this flat vertical roll 30a as well as the horizontal rolls 20a and 2Db.

By using 30b, the wall thickness of the joint part of continuous joint type section steel is thick at the root and thin at the tip, so it is formed into a so-called tapered wall thickness shape, which is reasonable in terms of product shape and joint performance, and has less wasted parts. It is economical, and intermediate rough rolled material 1
It is possible to reduce the web deviation of 5a and the difference in wall thickness between the upper and lower flanges.

Next, the intermediate rough rolled material 1 rolled by the universal mill U
5a is an edger placed in pair with the universal mill U.
The end of the flange is shaped by the holes KAL and 3E of the mill E, and an intermediate rolled material 15b having a predetermined flange width is formed. Horizontal roll 21a of this edger mill E
, 21b has the same shape as the horizontal roll in a conventional edger mill for H-shape rolling, and the intermediate rolled material 15b
The web surface is not actively rolled down, but both ends of the web are restrained and the tip of the flange is rolled down at the same time, so no web deviation occurs. In this example, a simple example is shown in which the intermediate rolling mill is a pair of roughing universal mill U and edger mill E, but if necessary, multiple pairs of rolling mills can be grouped. You can also do this.

Next, the intermediate rolled material +5b having a vertically symmetrical approximately H-shaped cross section of various web thicknesses rolled by the rough universal mill U and edger mill E is bent outward at the flange portion by a flange bending mill SKM. It is bent and formed into an intermediate finish rolled material I6. This flange bending mill SKM is usually called a skew mill, and includes oblique rolls 40a, 40b, 4La, and 41b each having a substantially trapezoidal cross section and whose width can be adjusted vertically and in a direction perpendicular to the rolling direction. The oblique rolls 40a to 41b are attached to the upper flange 4.
01, a lower flange 402, and a curved body part 403 between them, and the roll axis C is inclined at an axial angle α with respect to a plane perpendicular to the horizontal plane in the rolling direction, and at an inclination angle β with respect to the horizontal plane in the rolling direction. It is set. In the present invention, the mill SKM is fitted with a flange, so that outward bending can be performed extremely smoothly.

Subsequently, the intermediate finish rolled material 16 whose flange portion has been preformed and bent is finished into a final product 17 of a continuous joint type steel section by a finishing rolling mill F. The roll hole type KAL of the upper and lower horizontal rolls 23a and 23b of the finishing rolling mill F,
1 is formed with a flange bending finishing hole type R on the body part that presses the web part and its both ends, and the hole opening degree of this water roll is adjusted according to the thickness of the web and the flange thickness. A joint portion (claw) 18 is formed using the R portion of the mold. Note that the outer shape of the upper and lower halves of the flange bending finishing hole mold R forming the joint part (claw) 18 of the product is the same in a series having the same effective width W.

In this way, the web thickness Tw of the continuous joint type section steel of the present invention is mainly created by adjusting the rolling reduction of each horizontal roll of the universal mill U1 flange bending mill S and finishing mill F, and the thickness of the joint part is Claw seat (flange thickness) Tp
The O size is created by adjusting the rolling reduction of the vertical rolls 30a and 30b.

Hereinafter, a method for smoothly forming a joint part within a product series having the same effective width W, which is a characteristic effect of the present invention, will be described in detail.

The present inventors formed a curved recess P on the flange of the intermediate rolled material (H-shaped cross section) at the widthwise end side of the upper and lower horizontal rolls as shown in FIG. , we proposed preliminary bending with a hole type KAL, which has a stopper part P1 at its end to restrain the flange tip.

During this preliminary bending, the tip of the flange of the intermediate rolled material 16 comes into contact with point V at the start of biting, and as the gap between the upper and lower rolls decreases in the vertical direction (↑↓ in the direction of the applied force), it is not compressed by the rolls until it reaches point 21. The bending process is performed while sliding on the inner periphery of the curved recess.When sliding on the inner periphery of the curved recess P, large friction is generated between the flange tip surface and the surface of the flange, as shown in FIG. Wrap-like scratches may occur over a width of 5 to 15 ml, and the roll may also be sequestered and wear may progress rapidly.

In particular, in the preliminary bending described above, the biting angle γ of the flange tip to the roll curved surface P, which is determined by the following formula, becomes large.

d-Δh γ-CO5 where d: Roll radius at contact start point Δh: Reduction amount For example, if d=980mm and Δh=1851, γ-
It becomes 35.8 degrees, which is quite large. When the biting angle becomes large like this, biting problems are likely to occur.
In addition, the material tends to sway from side to side within the hole mold, causing the joint shape of the product to change easily. If finish rolling is carried out as it is, the left-right symmetry of the joint length will be poor, resulting in an asymmetrical claw shape as shown in Figure 6, which will result in the male joint mating and unmating (left-hand type) and mating ability (right-hand type). It can be.

The present invention prevents this from occurring.

That is, as shown in the right half of FIG. 3, the flange preliminary bending of the intermediate rolling member 16 comes into contact with the curved body 403 of the skew type forming mill SKM and the upper flange 401 near the corner U point at the start of biting. . The oblique rolls 40a and 40b move in one direction indicated by the arrow due to the action of the axial angle α. The tip of the flange is moved by the rotation of the skew roll, and at this time, the rolling edge of the roll acts and moves to point 21 without receiving any force along the bending direction. The bite angle γ at this time is smaller than that of the stopper type prior art described above, and for example, if the roll radius at the contact start point is φ-830 mm and the rolling reduction amount Δh = 82 m11, it becomes γ-257° (γ
was calculated using the above formula. ). That is, according to the method of the present invention, there is almost no relative slippage on the flange of the intermediate rolled material 16 with the roll curved concave surface during preliminary bending of the flange, so that scratches and roll seizure of the product are eliminated and the product is stabilized. It is possible to obtain a series of continuous joint type steel sections that can be bent and have a highly accurate joint shape with a constant joint opening.

(Effects of the Invention) As described above, according to the present invention, a series of continuous joint type steel sections with a constant effective width W can be manufactured using the same roll row, and in particular, the joint part can be formed smoothly, stably, and accurately. Continuous joint shaped steel sections with extremely smooth joint fit can be manufactured.

According to the direction and equipment array of the present invention, in the existing H-shaped steel universal rolling equipment array, the same roll set can be used for multiple sizes of web thickness TW and joint thickness T.

Continuous joint shaped steel sections with female joints can be made into economical desired sizes according to the construction project, while maintaining common compatibility with male joints of the same size and shape. The required number of accessories is drastically reduced, the roll unit consumption is improved, and the number of roll changes is reduced, which improves the operating rate and requires fewer personnel to change the rolls. There are also significant production benefits, such as being able to consolidate the size of the materials used. In addition, high-quality continuous joint shaped steel sections with stable joint shapes and excellent workability can be efficiently manufactured even in small lots, making it possible to respond quickly and accurately to the current diversifying market needs.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing the rolling sequence according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the rolling process according to an embodiment of the present invention, and FIG. 3 is a flange bending mill of the present invention ( Figure 4 is an illustration of flange bending in a flange bending mill in the prior art; Figure 5 is a diagram showing the state of the flange formed by the method in Figure 4; Figure 6 is the conventional method. Figure 7(a) is a cross-sectional diagram illustrating the rolled shape of a steel sheet pile; 8
Figures (a), (b), (c) and (d) are explanatory diagrams showing an example of use in which the vertically and horizontally symmetrical continuous joint shaped steel section produced according to the present invention is formed as a box-shaped steel sheet pile, and Fig. 9 is an explanatory diagram showing an example of the use of the vertically symmetrical continuous joint shaped steel section produced according to the present invention. An explanatory diagram showing the rolling method of vertically asymmetrical and laterally symmetrical straight steel sheet piles using the groove rolling force of . Fig. 11 is an explanatory diagram showing the method of rolling vertically symmetrical and laterally asymmetrical straight steel sheet piles using the conventional universal rolling method. An explanatory diagram showing a rolling method for shaped steel sheet piles. BD Ni Breakdown Mill U, Universal Mill E, Edger Mill

Claims (1)

[Claims] A rough rolling process with a breakdown mill, an intermediate rolling process with a universal mill and an edger mill,
In a continuous joint type steel rolling method including an intermediate finishing process using a flange bending mill and a finishing rolling process using a finishing mill, the slab material is roughly shaped into a dogbone shape,
This roughly shaped material is rolled by the universal mill and edger mill to form an intermediate rolled material with an H-shaped cross section with a constant inner width of the web portion and a predetermined thickness of the web and flange. The flange of the intermediate rolled material is formed using a flange bending mill equipped with a pair of upper and lower oblique rolls having a predetermined axis angle with respect to a plane perpendicular to the horizontal plane of the rolling direction, and whose width can be adjusted in a direction perpendicular to the rolling direction. After curving outward, the spacing between the upper and lower horizontal rolls is adjusted using a finishing mill to shape the web portion to the specified thickness, and the flange portion is formed into the specified joint shape, and the joint opening width is approximately constant. A rolling forming method for continuous joint type steel sections, which is characterized by the following finish.