JPH0767562B2 - Rolling method for continuous joint shaped steel - Google Patents

Description

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

(Prior Art) FIG. 5 (a) shows an example of the most typical shape of a continuous joint shape steel targeted by the present invention. In the figure, continuous joint section steel 1
Has a female joint 1b having a joint portion thickness T _F opened in the axial direction of the web at both ends of the web 1a formed to have a predetermined web thickness T _W. The distance W between the center portions of the left and right female joints 1b is called the effective width. 5 (b) and 5 (c) show an example of the product shape of the connecting member 6 having a male joint that fits into the female joint 1b of the continuous joint shaped steel 1, and the connecting member 6 in FIG. The H-shaped steel has a simple shape with a short flange width, and the connecting member 6 of FIG. 5 (c) has a joint inner space formed at the time of fitting with a female joint by bending a flange serving as a male joint outward ( It is a deformed H-section steel with a large margin. The cross-sectional shapes of the continuous joint shape steel 1 of FIG. 5 (a) and the connecting members shown in FIGS. 5 (b) and 5 (c), which are the connecting members, are completely symmetrical vertically and horizontally. Moreover, 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 T _W and the joint portion thickness T _F. The product size has the same effective width W and joint thickness T _F within the series, and the web thickness T _W has various thickness configurations.

Typical applications of these continuous joint shaped steels are shown in Fig. 6 (a),
As shown in (b), (c), and (d), a so-called box in which H-shaped steel 3 or plate 5 is welded to a web of two continuous joint shaped steels 1 to form a H-shaped cross-section Used as shaped steel sheet pile. 6 (a) and 6 (c) are examples in which the H-shaped steel 3 is welded, and FIGS. 6 (b) and 6 (d) are examples in which the plate 5 is welded. Further, in FIGS. 6 (a) and 6 (b), a large H-section steel 2a having a wide web equivalent to the effective width W of the continuous joint section steel 1 is used as a member of the male joint. In Figures (c) and (d), a small H-shaped steel 2b having a narrow web is used as a member of the male joint. Further, in FIG. 6 (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 characteristics of this steel box-type steel sheet pile are that the wall thickness can be made thin because it has excellent cross-sectional performance, it is suitable for the wall function because the surface of the constituent members is smooth, and that it is easy to combine with concrete. There are concrete applications such as continuous retaining walls, foundation piles, earthquake resistant walls for permanent construction, and deep landslide piles.

In recent years, due to the active development of underground space, increasing depth and construction in urban areas have become mainstream, and the workability of continuous joint type steel 1 which is the basic member of the box-type steel sheet pile is improved. There is a demand for improved fitting performance of joints with a focus on, and the provision of a product series with a wide range of cross-sectional performance has become an important issue. Especially when constructing a deep underground wall,
Since the earth pressure is small near the ground, the web thickness T _W of the continuous joint section steel 1 may be small, but in the underground where the earth pressure increases, the web thickness T _W is increased according to the increase of the earth pressure. It is necessary to increase the rigidity strength of the shaped steel sheet pile. In this case, the joint thickness T _F of the joint portion is constant even if the web thickness T _W is increased. During construction, relatively short box-shaped steel sheet piles made of continuous joint shaped steel 1 having different web thickness T _W are sequentially joined in the longitudinal direction at the construction site and continuously laid in the longitudinal direction. On the other hand, since the cross-sectional shape and dimensions of the male joint material of FIGS. 5 (b) and (c) that fit with this are constant over the entire laying length, the joints of continuous joint shaped steel are the same regardless of the product size. Uniform fitting property with the male 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 of the product becomes unstable, making the rolling operation extremely difficult. Further, since the number of hole types is large, a long roll body length is required, and it is difficult to manufacture a wide continuous joint shaped steel having a large effective width W.

As a solution to this problem, a so-called universal rolling method disclosed in Japanese Examined Patent Publication No. 47-47784 is known as a rolling method for removing defects in forming by directly reducing the material forming the joint. A representative example of this universal rolling method is shown in FIG. 8. By performing universal rolling at K4-1, 2, and 3 in the intermediate rolling section, it is possible to manufacture from a rectangular billet SL. Also, in Japanese Examined Patent Publication No. 58-38241, the finish hole type K
In 1 as well, a means for suppressing the variation in the hole width of the joint by limiting the hole width of the left and right joints with the hard roll fitted in the left and right joint parts by adopting the finish universal rolling method is also well known.
However, even with this method, the upper and lower horizontal rolls need to have a relatively deep and complicated hole shape, and the above problems cannot be solved.

As another measure, a method in which the shape of a straight steel sheet pile is changed to a product shape that can be easily rolled, a so-called universal rolling facility for H-section steel is used, and rolling is possible by means similar to the rolling method for H-section steel There is. The technique of Japanese Patent Publication No. Sho 55-11921 shown in FIG. 9 and the technique of Japanese Patent Publication No. Sho 55-1 shown in FIG.
The technology of Japanese Patent No. 913 is an example thereof, and although the problem in the case of rolling with a hole type having a closed hole type described above has been solved, it is directed to the production of a linear steel sheet pile of a specific size.

As described above, if the conventional method for rolling straight steel sheet piles is suitable, the web thickness T _W has to be limited to a very narrow range due to the limitation of shaping, and the same roll set is used. Then, there is a problem that it is impossible to roll the continuous joint shape steel having various web thicknesses T _W while keeping the joint shape constant.

(Problems to be Solved by the Invention) The present invention, when producing a continuous joint shaped steel by rolling, does not cause defective joint shape, bending during rolling, reduction of roll unit, etc., and web thickness T Providing a means that allows _W to be created in any desired size according to the purpose of the application, and by utilizing the existing H-section steel universal rolling machine row as much as possible, new installation or modification of rolls or guides can be minimized. The purpose is to produce a continuous joint shaped steel having a constant effective width and a constant joint shape and dimension.

(Means for Solving the Problem) The present invention provides a breakdown mill for rolling a billet raw material into a rough shaped material,
An intermediate rolling mill composed of a universal mill and an edger mill for rolling the rough shaped material into an intermediate rolled material having a substantially H-shaped cross section, a flange bending apparatus and a finishing mill for intermediate finish rolling and flange bending of the rolled material. In the method of rolling steel, the rough shaped material formed into a dogbone shape with the breakdown mill, the web portion with a predetermined various thickness and inner width constant dimension with the intermediate rolling mill and the thickness and width of the flange portion After being formed into an intermediate rolled material having a substantially H-shaped cross-section with a fixed size, and then the flange portion is curved outward by the curved portion of the upper and lower horizontal rolls with the widthwise end portions opened, the upper and lower horizontal portions of the finishing mill are horizontally curved. Finishing the flange part with rolls, and manufacturing continuous joint shaped steel having a web thickness of various predetermined sizes and a constant effective width and joint shape / dimension. It is an extension method.

Further, hard rolls having ridges formed on the circumferential surfaces of the rolls are provided on both sides of the upper and lower horizontal rolls of the finishing mill, and the ridges of the hard rolls are finish-rolled while being fitted between the upper and lower flange ends of the material to be rolled. A rolling method for producing a continuous joint shaped steel having a web thickness of various predetermined sizes and a constant effective width and a constant joint shape / dimension.

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

FIG. 1 shows a rolling method in the case where the present invention is applied to the production of vertically and horizontally symmetrical continuous joint shape steels, and FIG. 2 shows an example of arrangement of rolling devices for carrying out the method of the present invention.

In the figure, the breakdown mill BD is a process in which a thin slab having a rectangular cross section or a dogbone-shaped steel slab is subjected to edging a plurality of times by upper and lower horizontal rolls to process it into a dogbone-shaped roughly shaped material. The breakdown mill according to the present invention is used in the rough rolling process of the section steel having a flange such as the conventional H section steel as described above, and a detailed description thereof will be omitted.

Next, the intermediate rolling mill is composed of a rough universal mill U and an edger mill E. First, the rough shaping material is rolled and shaped by the hole type KAL.3 of the rough universal mill U into an intermediate rough rolling material 15a having a substantially H-shaped cross section. . UNIVERSAL MILLE U
As the horizontal rolls 20a and 20b, rolls are used in which the surface pressing the web surface of the intermediate rough rolled material 15a is flat and the side surface abutting the inner surface of the flange has an outer inclination angle α. The outer inclination angle α is the same as that used for universal rolling of conventional H-section steel or I-section steel. On the other hand, as the hard rolls 30a and 30b, rolls for pressing the flange surface of the intermediate rough rolled material 15a whose roll peripheral surface is formed substantially flat (hereinafter referred to as flat hard rolls) are used. It is possible to use flat hard rolls used in such finishing universal mills. That is, by using a flat hard roll, the thickness of the joint portion of the continuous joint shaped steel is formed into a so-called tapered wall shape with a thick base and a thin tip.
It is possible to prevent the web deviation and the flange thickness deviation of the intermediate rough rolled material 15a that are likely to occur when using the abacus ball-shaped hard roll used in the shape rolling.

Next, the intermediate rough rolled material rolled by the rough universal mill U
15a is formed into an intermediate rolled material 15b having a predetermined flange width by shaping the flange end of the rough universal mill U by a hole type KAL.3E of an edger mill E. Horizontal rolls 21a, 21b, 21c of this Edger Mill E,
21d has the same shape as the horizontal roll in the conventional edger mill for manufacturing H-section steel with a constant flange width described in JP-A-62-77107, and is positive for the web surface of the intermediate rolled material 15b. Web thickness T _W
Even if the web is changed, the horizontal rolls 21a and 21b restrain the both ends of the web while the horizontal rolls 21c and 21d simultaneously roll down the flange tip at any position in the flange width direction. The flange width B can be made constant while preventing deviation. In this example, the intermediate rolling step is a simple example in which one coarse universal mill U and one edger mill E are arranged to form a pair.
If desired, a plurality of pairs of rolling mills may be grouped.

Next, the intermediate rolled material 15b having various web thicknesses, flange thicknesses, and constant flange widths and having a substantially H-shaped cross section that is vertically and horizontally symmetrically rolled by the rough universal mill U and the edger mill E is removed by the flange bending apparatus S from the flange portion. Curved and bent in one direction, and formed into the intermediate finish rolled material 16. The horizontal rolls 22a and 22b of this flange bending apparatus S are hole type KAL.2.
As shown in (1), a copper portion for restraining the web of the intermediate finish rolled material 16 and curved concave portions P for performing bending forming are formed at both end portions in the width direction of the roll, and side end portions are open.

Subsequently, the intermediate finish rolled material 16 having the flange portion preformed and bent is finished by the finish rolling mill F into the final product shape 17 of the continuous joint shape steel. The roll cavities of the upper and lower horizontal rolls 23a, 23b of the finish rolling mill F are KAL.1 (a) or KAL. (B), and are formed by the flange bending finish cavities R for finish forming the joint portion 18. Note that KA in Fig. 1
The upper and lower horizontal rolls 23a and 23b of L.1 (a) and 1 (b) are divided into left and right, but may be integrated as in KAL.2. KAL.1 (a) consists of horizontal rolls only, but KA
In L.1 (b), the rigid rolls 40a and 40b with ridges are horizontal rolls
Placed on both sides of 23a, 23b, fit the ridges 41a, 41b of the ridged hard rolls 40a, 40b between the upper and lower flange ends of the material to be rolled (between joint ends), and By limiting the width, the width and position of the joint opening of the final product shape 17 are accurately formed.

Since the load and torque acting on the hole type KAL.2 formed on the horizontal rolls 22a and 22b of the flange bending apparatus S are extremely small, when the universal mill U and the finishing mill F are continuous rolling, the flange bending is performed. Even if the apparatus 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. If the horizontal rolls 23a, 23b of the finishing mill F are drilled in parallel with the hole type KAL.1 (a), 2 and the material is laterally shifted between the passes during rolling, the flange bending apparatus S
Need not be provided separately.

The size of the web thickness T _W of the continuous joint shape steel is classified by adjusting the horizontal rolls of the rough universal mill U, the edger mill E, and the flange bending machine S to reduce the size of the joint portion. The rolls of the hard rolls 30a and 30b and the horizontal rolls 21c and 21d are adjusted so as to have the shape dimensions.

In the following, the reason why the web thickness T _W can be size-separated in the product series in which the joint shape dimension and the effective width W are constant, which are the characteristic actions of the present invention, and the conditions of the hole shape are described in detail.

Fig. 3 (a) is an explanation for forming continuous joint shaped steels of different plate thickness sizes with different web thickness T _W and claw thickness (flange thickness) T _{F in} the finishing rolling process with the same finishing horizontal rolls 23a, 23b. FIG. 3 (b) shows that the upper and lower flange ends (joint ends) are regulated by inserting the hard rolls 40a, 41b with ridges 41a, 41b from the roll ends of the finishing horizontal rolls 23a, 23b. It is an explanatory view in the case of molding while (however, FIGS. 3A and 3B show only the left side portion). For example, maximum web thickness
When _resizing from T _WMAX to minimum web thickness T _WMIN :
The roll gaps of the horizontal rolls of the rough universal mill U, the edger mill E and the flange bending machine S are changed so that the web thickness of the intermediate finish rolled material 16 _becomes T _WMIN , and the finishing horizontal rolls 23a, 23b and the hard rolls 40a, 40b are changed. Maintains the actual roll gap in the suitable material of the rolled material at a predetermined constant value. At this time, the roll gaps of the hard rolls 30a, 30b and the horizontal rolls 21c, 21d are adjusted so that the flange width and thickness of the intermediate finish rolled material 16 are constant. Therefore, the joint shape is constant, and there is no problem even if the same male joint is used for connecting various thickness sizes in the longitudinal direction. FIG. 4 (a) shows the dimensional relationship of the finishing bend forming hole die KAL.1, and FIG. 4 (b) shows the dimensional relationship of the pre-bending forming hole die KAL.2. K
The relationship between the inner width w of AL.2 and the inner width w of KAL.1 is preferably w = W-α, α = 0 to 10 mm. If α is less than 0 mm, the material will swing left and right within KAL.1 and the joint shape will be incorrect. If α exceeds 10 mm, the material will be spread to both sides by the KAL.1 horizontal roll, resulting in defective joint shape and deviation in web thickness.

KAL.3E flange center line length l ₃ (see Fig. 1) is KAL.2
Is determined from the centerline length l _{2 of} and the centerline length l _{1 of} KAL.1.

l ₃ = (1 + β ₂ ) × l ₂ , l ₂ ＝ (1 + β ₁ ) × l ₁ β ₁ , β ₂ is the reduction rate of the center line length due to bending in KAL.1,2 The larger the material, the larger the bending resistance, such as when the friction on the roll surface is large. In addition, KAL.1 (a) vs. KAL.1
In (b), if β ₁ is increased by about 0.5 to 3% in consideration of the reduction margin of the flange tip (joint toe) by the hard rolls with protrusions 40a, 40b, the molded shape becomes more stable. In addition, KAL.2
The horizontal rolls 22a and 22b are designed to stabilize the material vertically and horizontally and to maintain symmetry by restraining the web portion of the intermediate finish rolled material 16 during bending in the hole die.
However, in the KAL.1 finishing horizontal rolls 23a, 23b, the web portion can be restricted only in the case of the maximum web thickness T _WMAX ,
For other general web thickness T _W , the gap (T
_WMAX- T _W ) is generated, so the shape of the bending process tends to become unstable. As a countermeasure against this, it is effective to dispose the hard rolls 40a and 40b with ridges at the ends of the left and right joints. Further, it is also effective to guide the material in close contact with the guide device so as to have a shape that follows the change of the shape of the material formed by the roll of the material and to penetrate the material from the entrance side.

In addition, in the above example, the intermediate universal mill group is one group of U and E, but of course, it may be a plurality of groups.
Generally, the method and apparatus of the present invention can be applied to any factory where universal rolling of H-section steel is performed. Furthermore, in order to manufacture a series of vertically and horizontally symmetrical continuous joint shaped steel, the rolls of BD, U and E mills can be shared with the existing H-shaped steel rolling series by properly determining the effective width and joint shape. So, in the end, the flange bending machine S and finishing mill F
Only the horizontal roll of 1 is required to be prepared as a dedicated roll and within the same effective width.

According to the method of the present invention (Effect of the Invention), existing at H-beam universal rolling device rows, the web thickness T _W of the multi-size in the same roll pair
Since it is possible to make a continuous joint shaped steel having a female joint with a constant shape and dimensions of a size having a desired cross-sectional performance economically according to the construction project while maintaining the common fitting property with the male joint. In addition, the required number of rolling rolls and their accessories is drastically reduced, the roll unit is improved, and the number of roll changes is reduced, so that the operation rate is improved and the number of change workers 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 diagram showing a rolling process according to one embodiment of the present invention, and FIGS. FIG. 4 (a) and FIG. 4 (b) are explanatory views of the rolling procedure of vertically and horizontally symmetrical continuous joint shaped steels of various thicknesses according to the present invention. FIG. 5 (a), (b), (c) is a schematic cross-sectional view for explaining the shapes of the vertical and left-right symmetrical type continuous joint shaped steel and male joint according to the present invention, and FIG. 6 (a). , (B), (c), and (d) are explanatory views showing an example of use in which the vertically and horizontally symmetrical continuous joint shape steel manufactured according to the present invention is formed as a box-type steel sheet pile, and FIG. Fig. 8 is an explanatory view showing a rolling method of vertically asymmetrical left-right symmetrical type straight steel sheet pile by rolling method, and Fig. 8 shows a part of the conventional hole rolling method. Fig. 9 is an explanatory view showing a rolling method of a vertical asymmetric left-right symmetrical straight steel sheet pile to which the monkey rolling method is applied. Fig. 9 is an explanatory view showing a vertical symmetrical left-right asymmetric straight steel sheet pile rolling method by a conventional universal rolling method. FIG. 1 is an explanatory view showing a conventional method of rolling a vertical asymmetrical left-right symmetrical linear steel sheet pile by a universal rolling method. BD: Breakdown mill U: Universal mill, E: Edger mill S: Flange bending machine, F: Finishing mill 15a, 15b: Intermediate rough rolled material 16: Intermediate finished rolled material, 17: Final product 20a, 20b: Universal mill U Horizontal Rolls 30a, 30b: Universal Mill U Hard Rolls 21a, 21b, 21c, 21d: Edger Mill E Horizontal Rolls 22a, 22b: Flange Bending Machine Horizontal Rolls 23a, 23b: Finishing Mill F Horizontal Rolls 40a, 40b : Hard roll with ridge

Claims (2)

[Claims] 1. A breakdown mill for rolling a billet material into a rough shaped material, an intermediate rolling mill composed of a universal mill and an edger mill for rolling the rough shaped material into an intermediate rolled material having a substantially H-shaped cross section, and the rolled material as an intermediate In a method of rolling a continuous joint shaped steel by a flange bending apparatus and a finishing mill for finish rolling and flange bending, a rough shaped material formed into a dogbone shape by the breakdown mill, a web portion by the intermediate rolling mill. Curved parts of upper and lower horizontal rolls formed into an intermediate rolled material having a substantially H-shaped cross-section with predetermined thicknesses and constant inner widths and flange thicknesses and widths fixed dimensions, and subsequently with the widthwise ends open. After bending the flange part outward by means of the above, the flange part is finish-molded by the upper and lower horizontal rolls of the finishing mill to obtain the web thickness of various predetermined sizes. And the effective width and rolling process method of continuous joint type shaped steel fitting shape and size, characterized in that the production of certain continuous joint type section steel. 2. On both sides of the upper and lower horizontal rolls of the finishing mill,
A hard roll having a ridge formed on the circumferential surface of the roll is provided, and the ridge of the hard roll is finish-rolled while being fitted between the upper and lower flange ends of the material to be rolled, and has a web thickness of various predetermined sizes. The method for rolling a continuous joint shape steel according to claim 1, wherein the continuous joint shape steel having a constant effective width and a constant joint shape and size is manufactured.