JPH0767563B2 - Roll forming method for continuous joint shaped steel - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for forming continuous joint shaped steel by rolling.

(Prior Art) The continuous joint shape steel to which the present invention is applied has the most typical shape example thereof on both ends of the web 1a formed to have a predetermined wall thickness Tw as shown in FIG. 7 (a). , And has a female joint portion 1b having a thickness T _F and opening in the axial direction of the web. The left and right female joints
The center-to-center distance W of 1b is called the effective width. The same figure (b),
(C) shows an example of the product shape of the connecting member 6 having a male joint that fits into the female joint portion 1b of the continuous joint shaped steel 1, and the connecting member 6 in FIG. Is a simple H-shaped steel having a short length, and the connecting member 6 of FIG. 6C has a joint inner space (a margin of a space) formed when the flange serving as a male joint is curved outward to be fitted with a female joint. Is a deformed H-section steel with a large The cross-sectional shapes of the continuous joint shape steel 1 of FIG. 9A and the connecting members 6 of FIGS. 8B and 8C are completely symmetrical vertically and horizontally. The product size of the conventional linear steel sheet pile having a similar shape is generally set for each of the effective width W, the web thickness Tw and the joint portion thickness T _F , but the product of the continuous joint shaped steel 1 targeted by the present invention. The size has the same effective width W in the series, and the web thickness Tw and the joint portion thickness T _F have various thickness configurations and are used for various purposes.

The general use of these continuous joint shaped steels is as shown in FIGS. 8 (a), (b), (c), and (d). It is used as a so-called steel box steel sheet pile in which a steel 3 or a plate 5 is welded to form an H-shaped section. Of these, the same figure (a) (c)
Is an example in which H-shaped steel 3 is welded, FIGS. 7 (b) and 7 (d) are examples in which plates 5 are welded, and in FIGS. 9 (a) and 9 (b), a continuous joint type is used as a male joint member. The large H-shaped steel 2a having a wide web equivalent to the effective width W of the shaped steel 1 is used, and in the figures (c) and (d), it is a small type with a narrow web as a member of the male joint. H-shaped steel 2b is used. Further, in FIG. 8 (a), a stiffening member 4 for preventing deformation is used in order to compensate for the insufficient strength of the continuous joint shaped steel 1 and the large H-shaped steel 2a.

The features of the steel box-type steel sheet pile assembled in this way are that the wall thickness can be made thin because it has excellent cross-sectional performance, and because the surface of the component members is smooth, it is suitable for wall function, and the composite structure with concrete is It is easy, and its specific uses include continuous retaining walls, foundation piles, earthquake-resistant walls for permanent construction, and landslide deep foundation piles.

In recent years, increasing depth and construction in urban areas have become mainstream in the active development trend of underground space. In the construction done in artificial dense areas in urban areas, vibro hammers and other driving machines that were used before cannot be used to prevent vibration and noise. Therefore, there is a strong demand for joint fitting property that enables steel sheet piles lifted by a crane or the like to smoothly fit into each other's joints without using any means such as driving. That is, it is an important subject to improve the fitting property of the joint, which emphasizes the workability, and to provide a product series having a wide range of cross-sectional properties, even for the continuous joint shaped steel 1 which is the basic member of the above-mentioned steel box-type steel sheet pile. It has become. Especially when constructing a deep underground wall,
Since the earth pressure is small near the ground, the web thickness Tw of the continuous joint type steel 1 may be small, but when used inside the underground where the earth pressure increases, increase the web thickness Tw to increase the rigidity of the box-type steel sheet pile. Need to raise. In this case, the joint portion thickness T _F of the joint portion may be increased as the web thickness T w is increased if necessary, but may be constant. At the time of construction, the continuous joint shaped steels 1 having different thicknesses and relatively short lengths are sequentially joined at the construction site in the longitudinal direction, driven in, and laid continuously in the longitudinal direction. On the other hand, since the cross-sectional shape and dimensions of the male joint material of FIGS. 7 (b) and 7 (c) that fit with this are constant over the entire laying length, the joint portion of the continuous joint shaped steel 1 is male regardless of the product size. Uniform fitting with the joint material is required.

As a general manufacturing method of the continuous joint shape steel, there is a so-called caliber rolling method of the conventional straight steel sheet pile shown in FIG. In the figure, the rough slab BB is a material produced in a slab or a casting plant, and this material BB is rolled into each product in each hole type of K13 to K1 to make a product. Since the rolling is performed mainly by the grinding action of the side wall of each, the type of each hole type is a closed hole type (Closed Pass)
Is an integral component of the pore series. For this reason, the amount of roll refurbishment due to hole-type wear is large, the roll unit is high, and a large amount of rolling oil and roll cooling water are
If this is insufficient, the shape of the joint portion of the product becomes unstable and rolling work becomes extremely difficult. Also, since there are many hole types,
A long roll cylinder length is required, and it is difficult to manufacture a wide linear steel sheet pile having a large effective width W.

As a solution to this problem, there is a so-called universal rolling method, which is disclosed in Japanese Patent Publication No. 47-47784, as a rolling method for removing a molding defect by directly applying a reduction to a material forming a joint. A typical example of this universal rolling method is shown in Fig. 10.
By performing universal rolling at 1, 2, and 3, it is possible to manufacture from rectangular billet material SL. See also Sho 58
As disclosed in the -38241 publication, by adopting the finish universal rolling method for the finish hole type K1 as well, by restricting the hole width of the left and right joints with the hard roll fitted in the left and right joint parts,
Means for suppressing the variation in the hole width of the joint are also known. However, even with this method, the upper and lower horizontal rolls need a relatively deep and complicated hole shape, and the above-mentioned problems cannot be solved.

As another measure, the shape of the straight-lined steel sheet pile was changed to a product shape that is easy to roll, and so-called universal rolling equipment for H-section steel was used, and it was improved so that it could be rolled by means similar to the rolling method for H-section steel. There is a means. The technology described in Japanese Patent Publication No. Sho 55-11921 shown in FIG. 11 and the technology described in Japanese Patent Publication No. Sho 55-1913 shown in FIG. 12 are examples, and in the case of rolling in the closed hole type described above. Although the problem has been solved, it is intended for the production of linear steel sheet piles of a specific size.

As described above, when the conventional straight type steel sheet pile rolling method is applied, it is unavoidable to limit the web thickness Tw to a very narrow range due to the limitation in shaping, and moreover, the same roll group is used for various types. Form a flange width according to the web thickness,
In addition, there is a problem in that it is impossible to roll a continuous joint shaped steel having a constant effective width and a substantially constant claw opening width.

(Problems to be Solved by the Invention) The present invention, when manufacturing a continuous joint type steel by rolling, does not cause a bad shape of the end joint portion, bending at the time of rolling, reduction of the roll unit, etc., and the web thickness Tw. It is possible to form a desired size and form a flange width according to the web thickness to obtain a continuous joint with a constant claw opening width. It is an object of the present invention to provide a method for rolling and forming by making the most of the H-shaped steel universal rolling machine train and minimizing new installation or modification of rolls or guides.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention provides a rough rolling step in which a breakdown mill is arranged, an intermediate rolling step in which a universal mill and a variable diameter edger mill are arranged, and a flange bending molding mill. With the intermediate finishing process arranged
In a rolling method of a continuous joint shaped steel including a finishing rolling step in which a finishing mill is arranged, a slab material is roughly shaped into a dogbone shape, and the rough shaped material is rolled by the universal mill and a variable diameter edger mill, When the inner width of the web is kept constant with the universal mill, and the web and flange are set to a specified thickness, the width of the flange is reduced while the web is restrained by the variable diameter edger rolls that are separated into the left and right sides. According to the optimum flange width, an intermediate rolled material having an H-shaped cross section was formed, and then the flange of the intermediate rolled material was curved outward by the curved portion provided in the width direction of the upper and lower horizontal rolls of the flange bending mill. After that, the spacing between the upper and lower horizontal rolls is adjusted with a finishing mill to shape the web into a predetermined thickness, the flange portion is formed into a predetermined joint portion shape, and the joint opening width is almost constant. Cormorant and roll forming method gist of rolled form type steel continuous joint type steel, characterized in that finish.

(Operation / Example) Hereinafter, an operation and an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of a rolling method when the present invention is applied to the production of a vertically and horizontally symmetrical continuous joint shape steel, and FIG. 2 shows an example of a rolling apparatus for carrying out the method of the present invention.

In the rough rolling process of the present invention, the breakdown mill BD
The upper and lower horizontal rolls perform edging multiple times using a thin-walled slab having a rectangular cross section or a dogbone-shaped steel slab as a raw material to process it into a dogbone-shaped rough shaped material. The rough rolling step in the present invention is the same step as the above-described rough shaping of a section steel having a flange such as an H-section steel as conventionally known. Therefore, its detailed description is omitted. Next, the jar mill E of the intermediate rolling shape steel of the present invention is arranged, and the rough shaping material is the intermediate roughing of the substantially H-shaped cross section having the predetermined web thickness and flange thickness by the hole type KAL.3 constituted by the universal mill U. It is roll-shaped on the rolled material 15a. Here, the horizontal rolls 20a, 20 of the universal mill U have a flat surface for pressing the web surface of the intermediate rough rolled material 15a and a side surface abutting the inner surface of the flange has an outer inclination angle α (approximately 3 to 10 degrees). The formed roll is used to restrain the inner surface of the flange, and the openings of the horizontal rolls 20a and 20b are adjusted to obtain a desired web thickness. That is, the horizontal rolls 20a and 20b have the same profile as the horizontal roll in the conventional universal mill for H-shaped steel rolling, and can be shared or used. On the other hand, as the hard rolls 30a and 30b, rolls that press the flange surface of the intermediate rough rolled material 15a and whose roll circumferential surface is substantially flat (hereinafter referred to as flat hard rolls) are used. Also, a flat hard roll used in a conventional universal mill for H-shaped steel rolling can be used. That is, by using a flat hard roll,
The continuous joint type steel has a thick joint at its base and a thin so-called tapered wall at the tip, resulting in an economical shape with no waste in terms of joint performance, and web deviation of the intermediate rough rolled material 15a. And the difference in wall thickness between the upper and lower flanges can be reduced.

Next, the intermediate rough rolled material 15 rolled by the universal mill U
a is formed on the intermediate rolled material 15b whose flange end is shaped by the hole type KAL, 3E of the variable diameter edger mill E which is arranged in a pair with the universal mill U and has a predetermined flange width according to the web thickness. To be done. This variable diameter edger mill E is composed of upper and lower web restraint rolls 21a, 21b and the rolls 2
The edging rolls 40a, 40b that rotate in synchronism with 1a, 21b are the main components, and the web surface of the intermediate rolled material 15b is not actively rolled down, but the restraint at both ends of the web surface and the rolling down of the flange tip are performed. Simultaneously, the flange according to the thickness of the web, that is, the flange piece width lk can be edging controlled to an appropriate dimension, and the web can be accurately held at the center position of the flange.

An example of a specific configuration of the variable diameter edger mill is shown in FIGS. 3 and 4. FIG. 3 shows an eccentric sleeve type variable diameter mill, in which an eccentric ring 52 is fitted on the outer peripheral surface of an edging roll 50 via a bearing 51, and a web restraint ring 54 is concentrically formed with the ring via a bearing 53. Inserted edger in the shaft C
The structure is fixed so that it can be moved left and right. Also the fourth
The figure shows a backup roll type, in which a pair of backup rolls 63 rotatably applied to the outer periphery of the shaft portion 62 of the web restraint roll 61 and a flange roll work roll 64 supported by the backup rolls are provided.
Has a structure that is displaced in the direction of the arrow. That is, the former is capable of adjusting the flange piece width lk by eccentric displacement and the latter by displacement of the backup roll.

(These edgers are used for rolling H-section steels, as disclosed in JP-A-62-77107 (FIG. 3) and JP-A-62-77101.
It is disclosed in Japanese Patent Publication (Fig. 4). ) The variable diameter edger mill referred to in the present invention has the above-mentioned configuration, but is not limited to the above examples, and it is capable of edging the flange piece width to a predetermined dimension for different web thicknesses. Any of them can be applied.

In the above-mentioned example, in the intermediate rolling step, one universal mill U and one variable diameter edger mill E are arranged to form a pair, but these may be knitted into a group of a plurality of pairs of rolling mills if necessary. Good.

Next, the intermediate rolled material 15b having a substantially H-shaped cross section having various web thicknesses which is rolled by the rough universal mill U and the edger mill E is formed by the forming mill S in the flange bending step.
The flange portion is curved and bent outwardly by the process to form the intermediate finish rolled material 16. This flange bending forming mill S has upper and lower horizontal rolls 22 as shown by hole pieces KAL, 2.
A curved concave portion P for performing bending forming on the widthwise ends of a and 22b.
Is formed.

Then, the final product 17 of the continuous joint shaped steel is finished by the intermediate finishing rolling mill F in which the flange portion is preformed and bent. The roll hole type KAL, 1 of the upper and lower horizontal rolls 23a, 23b of the finish rolling mill F is formed with a flange bending finish hole type R on the body portion which presses the web portion and both ends thereof. The outer shapes of the upper and lower halves of the flange bending finish hole die R forming the joint portion 18 of the product are common in the series having the same effective width W.

Since the load and torque acting on the hole type KAL, 2 formed on the horizontal rolls 22a, 22b of the flange bending forming mill S are very small, the flange bending forming is performed when the universal mill U and the finishing mill F are continuously rolled. Even if the mill S is a non-driving guide roller arranged on the rear surface of the edger mill E or the front surface of the finishing mill F, the function can be sufficiently exhibited. Further, in order to simplify the example of the apparatus, the horizontal rolls 23a, 23b of the finishing mill F may be dug with the hole types KAL, 1, 2 in parallel, and the material may be provided so as to be laterally shiftable between rolling passes.

As described above, in the present invention, the size of the web thickness Tw of the continuous joint shaped steel is classified by the universal mill U and adjusted by the horizontal rolls of the flange bending forming mill S and the finishing mill F. Also, the claw thickness (flange thickness) T _F , which is the joint thickness, is divided into hard rolls 30a, 30b.
Adjust with the reduction of. Then, the joint (claw) length, that is, the length of the flange piece width is adjusted by a variable diameter edger mill, and is formed into a constant joint opening width within a product series having the same effective width W by a finish rolling mill.

Hereinafter, the reason why the joint opening width, which is a characteristic operation of the present invention, can be made constant within the product series having the same effective width W, the conditions of the hole shape, and the like will be described in more detail.

As described above, the web thickness Tw in the present invention is separately produced by the universal mill U, and the flange piece width lk is adjusted by the thickness variation by the variable diameter edger mill E. As a result, the joint opening formed by flange bending in the finish rolling mill F is made constant. Fig. 5 shows a finish rolling mill with horizontal rolls 23a, which have the same specifications as continuous joint shaped steels of various sizes with different web thickness Tw and joint (claw) length.
Fig. 23 shows the case of rolling at 23b, a thin rolled material with a web thickness of tw ₁ (a) and a thick rolled material with a web thickness of tw ₂ (b)
The figure also shows a horizontal roll 23a with a joint hole type of radius R with the same specifications,
It is made by pressing up and down 23b. It is controlled as follows by adjusting the flange piece width lk This time joint length l ₂ of the joint of thin rolled material length l ₁ thick material diameter varying Ejjamiru E. That is, l ₂ = l ₁ + (tw ₂ −tw ₁ ) / 2 lk ₁ ＝ l ₁ (1 + β ₁ ) lk ₂ ＝ l ₂ (1 + β ₂ ) where β ₁ , β ₂ : KAL.1,2 bending Reduction rate of line length (claw length) associated with processing Therefore, by forming the flange piece width by the edger mill E according to the web thickness, and by bending and forming by the joint hole type in the finish rolling mill F, A constant opening width k will be maintained regardless of the web thickness.

The thickness of the joint (flange) may be increased as the thickness of the web increases, but if it is made as thin as the thin standard material, the overall weight when assembled on a box-shaped steel sheet pile will be relatively lighter. It is possible and advantageous in terms of bending.

FIGS. 6 (a) and 6 (b) show the structure of the joint portion of the straight steel sheet pile manufactured by the conventional method.

That is, in the conventional method, the flange piece width lc is not considered to be adjusted even if the web thickness of the rolled material is different when manufactured by the common roll, so the flange piece width lc is constant, and therefore the joint opening width k Is a thin material k of web tw _1
1 is a thick material k ₂ of the web _{tw 2 k 2 -k 1 = tw} 2 -tw 1 i.e. an opening difference of the web thickness difference. When such a steel sheet pile is used as a member for a continuous wall for a deep underground space, the self-weight fitting property is impaired. Further, since the dimensions of the male joint are determined on the basis of a thin material having a small space in the female joint, when the opening width k becomes large for the thick material, the male joint will come off.

In the present invention, a continuous joint shaped steel having a constant effective width W can be formed into a series, and the shaped steel without the above trouble can be obtained. Further, it is possible to manufacture a continuous joint type shaped steel having the same row of rolls and using the same joint member without changing the hole shape and having extremely smooth joint jointability.

(Effects of the Invention) According to the method and apparatus sequence of the present invention, in the existing H-section steel universal rolling apparatus sequence, the same roll set has a multi-sized web thickness Tw / female joint thickness T _F female joint. Since it is possible to make continuous joint shaped steel into a desired size economically according to the construction project while maintaining the common fitting property with the male joint of the same size shape, the requirement of the rolling roll and its accessories is required. As the number of rolls is drastically reduced and the unit of rolls is improved, the number of roll reshuffles is reduced, so the operating rate is improved and the reshuffling staff is small. Furthermore, the size of the materials used can be aggregated, which is a great advantage in production. Further, since it is possible to efficiently manufacture a high quality continuous joint shaped steel having a stable joint shape and excellent workability even in a small lot, it is possible to promptly and accurately meet the needs of the current diversifying market.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a rolling sequence according to one embodiment of the present invention, FIG. 2 is an explanatory view showing a rolling process according to one embodiment of the present invention, and FIGS. 3 and 4 are used for the present invention. Fig. 5 (a) (b) is a schematic sectional view for explaining the rolling shape of the continuous joint shape steel according to the present invention, and Fig. 6 (a) (b) is a conventional diagram showing an example of a variable diameter edger mill. Schematic cross-sectional views for explaining the rolled shape of the steel sheet pile, FIG. 7 (a) shows the shape of the continuous joint shaped steel of the present invention, and (b) and (c) show the shape of the male joint, FIG. (A) (b) (c) and (d) are explanatory views showing an example of use in which a vertically and horizontally symmetrical continuous joint shaped steel manufactured by the present invention is formed as a box-type steel sheet pile, and FIG. 9 is a conventional hole type Fig. 10 is an explanatory diagram showing the rolling method of vertical asymmetrical left-right symmetric straight type steel sheet pile by rolling method.Fig. 10 is a part of the conventional hole rolling method. An explanatory view showing a rolling method of a vertical asymmetric left-right symmetrical straight steel sheet pile to which the Niversal rolling method is applied, FIG. 11 is an explanatory view showing a vertical symmetrical left-right asymmetric straight steel sheet pile rolling method by a conventional universal rolling method, The figure is an explanatory view showing a conventional method of rolling a vertical asymmetrical left-right symmetric straight type steel sheet pile by a universal rolling method. BD: Breakdown mill U: Universal mill E: Variable diameter edger mill S: Flange bending mill F: Finishing mill 15a, 15b: Intermediate rolled material 16: Intermediate finished rolled material 17: Final product 20a, 20b: Horizontal of universal mill U Rolls 30a, 30b: Universal U hard rolls 21a, 21b: Edger mill E divided horizontal rolls 22a, 22b: Flange bending forming mill S horizontal rolls 23a, 23b: Finishing mill F horizontal rolls

Claims (1)

[Claims] 1. A rough rolling process with a breakdown mill, an intermediate rolling process with a universal mill and a variable-diameter edger mill, an intermediate finishing process with a flange bending mill, and a finishing rolling process with a finishing mill. In the rolling method of continuous hand-shaped steel including and, the slab material is roughly shaped into a dogbone shape, and the roughly shaped material is rolled by the universal mill and the variable diameter edger mill, and the inner width of the web portion is universal milled. A cross-section H having a constant flange width and a predetermined thickness of the web and the flange, and the width of the flange being reduced by restraining the web with the diameter-variable edger rolls separated into the right and left to obtain the optimum flange width according to the web thickness. Shape of the intermediate rolled material, and then the flange of the intermediate rolled material is formed by the curved portions of the upper and lower horizontal rolls provided at the widthwise ends of the flange bending mill. After allowed outwardly curved, and the flange portion in a predetermined joint section shape with by adjusting the distance between the upper and lower horizontal rolls in the finishing mill to shape the web to a predetermined thickness,
A rolling forming method for continuous joint shaped steel, which is characterized by finishing so that the joint opening width becomes almost constant.