WO2018186379A1 - Method and equipment for manufacturing flanged steel sheet piling - Google Patents

Abstract

The present invention suppresses the formation of shape defects such as flange unevenness by reverse rolling, and improves product dimensional precision and rolling stability. Provided is a manufacturing method for forming a flanged steel sheet pile from stock via grooved roll rolling, the method including a step for using the same groove to perform reverse rolling on the stock. The reverse rolling step includes a step for forming a first flange part straddling a neutral line and second and third flange parts disposed on either side of the first flange part. The groove comprises a first flange-facing section for forming the first flange part, a second flange-facing section for forming the second flange part, and a third flange-facing section for forming the third flange part. The angle of inclination of the first flange-facing section with respect to the horizontal plane is greater than the angles of inclination of the second and third flange-facing sections.

Description

Manufacturing method and manufacturing equipment for steel sheet pile with flange

(Cross-reference of related applications)
This application claims priority based on Japanese Patent Application No. 2017-073578 for which it applied to Japan on April 3, 2017, and uses the content here.

The present invention relates to a manufacturing method and manufacturing equipment for a steel sheet pile having a flange such as a hat-shaped steel sheet pile or a U-shaped steel sheet pile.

Conventionally, a steel sheet pile having joints at both ends, such as a hat shape, has been manufactured by a perforated rolling method. As a general process of the perforated rolling method, it is known that a rectangular material heated to a predetermined temperature in a heating furnace is first rolled in order by a roughing mill, an intermediate rolling mill and a finishing mill equipped with a perforated mold. It has been. As a perforated rolling method, for example, in Patent Document 1, a plurality of perforations are arranged on a roll in rough rolling, intermediate rolling, and finish rolling, and each of these perforations is rolled one or two passes to form a hat-shaped steel sheet pile. Techniques for manufacturing are disclosed.

In addition, for example, in Patent Document 2, a hole mold is formed so that the stretch balance between the web and the flange is maintained in the manufacture of the U-shaped steel sheet pile, and the material to be rolled is reciprocated several times in the same hole mold for rolling. Techniques to do are disclosed. Further, for example, Patent Document 3 discloses a technique for reducing the placing resistance during the construction of the steel sheet pile, and proposes a configuration in which a gently inclined portion is provided in the flange portion.

For example, Patent Document 4 discloses a Z-shaped steel including a step of forming a preform having two flange / web transition sections parallel to the rolling surface and a central section inclined with respect to the rolling surface in the vicinity of the neutral line. A manufacturing technique of a sheet pile is disclosed.

Thus, as a method for manufacturing a steel sheet pile, a perforated rolling method and a technique (so-called single-hole multi-pass rolling) in which rolling is performed by reciprocating a material to be rolled a plurality of times in the same perforation have been devised.

JP 2006-88176 A JP 60-44101 A JP 2004-76580 A JP-A-8-224634

However, in the conventional perforation rolling method exemplified in Patent Document 1 above, in the rough rolling, intermediate rolling process to finish rolling process, the flange is in a linear state at almost the same angle as the product, and one pass or two passes. In particular, when the flange width is large and the plate thickness is thin, when the reverse rolling is performed, the stretching balance of each part in the cross section of the material to be rolled cannot be achieved, and a flange wave may be generated. is there. In addition, the "hole type" in this specification shows the part which passes and rolls a to-be-rolled material in the clearance gap formed between the upper and lower hole type | mold rolls. Hereinafter, even if the distance between the upper and lower hole-type rolls varies, if the grooves on the roll forming the hole mold are the same, the hole type will be referred to as “the same hole type”. In addition, “reverse rolling” in the present specification refers to a process in which rolling is repeatedly performed by reciprocating a multi-pass rolled material while gradually narrowing a roll gap in the same hole mold constituted by upper and lower hole rolls. It is.

Moreover, in the technique described in the said patent document 2, especially when carrying out rolling which takes large extension | stretching with respect to a large steel sheet pile with a flange width large and thin flange thickness compared with the past like a hat-shaped steel sheet pile. In addition, even if the stretching balance described in Patent Document 2 is maintained, shape defects such as flange waves occur, stable rolling / modeling is difficult, and product shape defects may occur. In addition, there are cases in which an appropriate balance condition cannot be realized in order to suppress the occurrence of a shape defect such as a flange wave under the constraints of the rolling mill. In recent years, there has been a demand for steel sheet piles with large cross sections that are large in height and thin from the viewpoints of economy and workability, and further technical improvements are required in the production of such large steel sheet piles. It is a fact.

Moreover, in the technique described in the above-mentioned Patent Document 3, at least one part of a web part (defined as a flange part in the present invention) (a corner part formed by an end flange part and a web part and a central part of the web part) Although there is a description of reducing the placing resistance and improving the workability by providing a gently inclined portion in the above), there is no mention of shape defects such as flange waves in the manufacturing process, and a large steel sheet pile There is a need for further technical improvements with respect to the suppression of shape defects and the realization of stable rolling and modeling in the manufacture of steel.

In addition, the technique described in Patent Document 4 is presumed to be a technique for performing one-pass one-pass rolling, so-called reverse, in which the upper and lower roll gaps are gradually narrowed with the same hole mold and multiple-pass rolling is performed. There is no description of rolling. This is because, in the technique described in Patent Document 4, when reverse rolling is performed with the same hole shape, stretching is uneven for each part in the cross section, metal flow occurs, and the filling state of the joint portion changes. In addition, it is believed that the flange / web transition section stretch is geometrically larger than the center section stretch and is more likely to twist. In the case of performing one-hole type one-pass rolling, the shape of the hole shape can be optimized at the time of one-pass rolling, so that a problem such as a shape defect of the material to be rolled due to the hole shape cannot occur. That is, Patent Document 4 does not mention anything about the generation of a flange wave that may occur during reverse rolling, and naturally does not mention any suppression of the flange wave.

Therefore, in view of the above circumstances, an object of the present invention is to provide a steel having a flange capable of suppressing the occurrence of shape defects such as a flange wave due to reverse rolling and improving product dimensional accuracy and rolling stability. The purpose is to provide sheet pile manufacturing technology.

In order to achieve the above object, according to the present invention, there is provided a manufacturing method for forming a steel sheet pile having a flange from a material to be rolled by perforated roll rolling, and reverses the material to be rolled by the same hole die. The step of performing reverse rolling, the step of performing reverse rolling includes a step of forming a first flange portion straddling a neutral line and second and third flange portions disposed on both sides of the first flange portion. The hole mold has a first flange facing portion for forming the first flange portion, a second flange facing portion for forming the second flange portion, and a third flange portion. And a third flange facing portion, wherein an inclination angle of the first flange facing portion with respect to a horizontal plane is larger than an inclination angle of the second and third flange facing portions. Method for producing a steel sheet pile which is provided.

The reverse rolling step includes a step of forming a web corresponding portion and an arm corresponding portion, and the hole mold forms a web facing portion for forming the web corresponding portion and the arm corresponding portion. An arm facing portion, and the hole type includes a web side flange facing portion group including at least one second flange facing portion and an arm side flange facing portion group including at least one third flange facing portion. And a second straight line connecting a boundary portion between the web side flange facing portion group and the web facing portion and a boundary portion between the arm side flange facing portion group and the arm facing portion. The flange facing portion may have a convex shape in the flange outer direction, and the third flange facing portion may have a convex shape in the flange inner direction.

In the hole mold, rolling may be performed such that the flange extension λf1 in the first flange portion is smaller than the flange extensions λf2 and λf3 in the second flange portion and the third flange portion.

The step of forming the first flange portion, the second flange portion, and the third flange portion may be an intermediate rolling step.

The hole mold may have a hole shape in which both ends in the width direction are open.

The bent flange-corresponding portion formed on the material to be rolled by the step of forming the first flange portion, the second flange portion, and the third flange portion is formed into a desired flat shape by rolling in the latter-stage hole mold of the step. It may be rolled and formed into a shape.

In the hole mold, rolling may be performed so that the flange stretching λf1 in the first flange portion is equal to or less than the web stretching λw.

The steel sheet pile may be a hat-shaped steel sheet pile.

According to the present invention from another point of view, it is a production facility for forming a steel sheet pile having a flange from a material to be rolled by hole roll rolling, and reverse rolling is performed on the material to be rolled by the same hole die. A rolling mill that includes a rolling mill and performs the reverse rolling includes a first flange portion straddling a neutral line, and a hole mold that forms second and third flange portions disposed on both sides of the first flange portion. The hole mold includes a first flange facing portion for forming the first flange portion, a second flange facing portion for forming the second flange portion, and a third flange portion. And a third flange-facing portion, wherein the first flange-facing portion has an inclination angle greater than the inclination angle of the second and third flange-facing portions with respect to a horizontal plane. Manufacturing facility of the plate is provided.

The rolling mill for performing reverse rolling includes a web corresponding part and a hole mold for forming an arm corresponding part, and the hole mold forms a web facing part for forming the web corresponding part and the arm corresponding part. An arm-facing portion, and the hole mold includes a web-side flange-facing portion group including at least one second flange-facing portion and an arm-side flange facing including at least one third flange-facing portion. A portion group, and a straight line connecting a boundary portion between the web side flange facing portion group and the web facing portion, and a boundary portion between the arm side flange facing portion group and the arm facing portion, The second flange facing portion may be convex in the flange outer direction, and the third flange facing portion may be convex in the flange inner direction.

In the hole mold, the flange extension λf1 in the first flange portion may be smaller than the flange extensions λf2 and λf3 in the second flange portion and the third flange portion.

The hole mold may be a hole mold provided in an intermediate rolling mill.

The hole mold may have a hole shape in which both ends in the width direction are open.

Subsequent holes for rolling and shaping the bent flange-corresponding part formed on the material to be rolled into a desired flat shape by rolling with a hole mold that forms the first flange part, the second flange part, and the third flange part. A mold may be provided.

In the hole mold, the flange extension λf1 in the first flange portion may be equal to or less than the web extension λw.

The steel sheet pile may be a hat-shaped steel sheet pile.

According to the present invention, it is possible to suppress the occurrence of shape defects such as flange waves due to reverse rolling, and to improve product dimensional accuracy and rolling stability.

It is a schematic explanatory drawing of a rolling line. It is a schematic sectional drawing which shows the hole shape of a 1st hole type. It is a schematic sectional drawing which shows the hole shape of a 2nd hole type. It is a schematic sectional drawing which shows the hole shape of a 3rd hole type. It is a schematic sectional drawing which shows the hole shape of a 4th hole type. It is a schematic sectional drawing which shows the hole shape of a 5th hole type. It is a schematic explanatory drawing of the hole type | mold of the structure which the 3rd hole type | mold improved, (a) shows a schematic whole figure, (b) shows the enlarged view of the location vicinity which opposes a flange corresponding | compatible part. It is a schematic explanatory drawing which concerns on the modification of this invention. It is explanatory drawing about an Example. It is a schematic explanatory drawing which concerns on the modification of this invention. It is a schematic explanatory drawing which concerns on the modification of this invention. It is a schematic explanatory drawing which concerns on the modification of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted. In the present embodiment, the material to be rolled having a substantially hat-shaped steel sheet pile shape is described as being rolled in a posture in which the web is positioned below the flange (so-called U posture), but naturally the scope of application of the present invention is as follows. It extends to rolling in other postures (for example, reverse U posture). Moreover, although the applicable range of this invention is a steel sheet pile product which has various flanges, such as a hat shape and U shape, the steel sheet pile product manufactured in this Embodiment is demonstrated as what is a hat type steel sheet pile product. .

In addition, the material A to be rolled described below indicates a steel material that is rolled when a hat-shaped steel sheet pile product is manufactured, and the steel material that is passed through the rolling line L is collectively referred to as the material A to be rolled. The material A to be rolled in each rolling mill is described with a different name (A1 to A5 described below) as necessary. The material A to be rolled has a substantially hat-shaped shape, a web-corresponding portion 3 that is substantially horizontal, flange-corresponding portions 5 and 6 that are connected to both ends of the web-corresponding portion 3 at a predetermined angle, and each flange. It is comprised from the arm corresponding | compatible parts 8 and 9 connected to the edge part different from the connection side with the web corresponding | compatible part 3 in the parts 5 and 6, and the joint corresponding | compatible parts 10 and 11 connected with the front-end | tip of the arm corresponding | compatible parts 8 and 9. Has been. The end portions of the joint corresponding portions 10 and 11 are referred to as claw portions 14 and 15, respectively. Below, each site | part which comprises the to-be-rolled material A is illustrated and demonstrated with said each code | symbol.
In this specification, regarding the material A to be rolled, the rolling direction is referred to as the “longitudinal direction” of the material to be rolled, and the direction perpendicular to the longitudinal direction and parallel to the rolling roll axis is the “width direction” of the material to be rolled. The direction perpendicular to both the longitudinal direction and the width direction is referred to as the “height direction” of the material to be rolled and will be described. Further, “thickness reduction” of the material to be rolled refers to plate thickness reduction with respect to the thickness direction of the material to be rolled.

First, the outline of the rolling line L which is a fundamental structure as the manufacturing apparatus 1 which manufactures a hat-shaped steel sheet pile is demonstrated. FIG. 1 is an explanatory diagram of a rolling line L for producing a hat-shaped steel sheet pile, a rolling mill provided in the rolling line L, and the like. In FIG. 1, the rolling progress direction of the rolling line L is a direction indicated by an arrow, and the material A to be rolled flows in the direction, and each of the perforating rolling mills on the line (rough rolling mill and intermediate rolling described below). Rolling machine, finish rolling machine), and product is formed. In addition, the some conveyance roll which is not shown in figure is installed on the rolling line L, and the to-be-rolled material A is conveyed on the rolling line L by these conveyance rolls.

As shown in FIG. 1, a rolling line L includes a roughing mill (BD) 17, a first intermediate rolling mill (R1) 18, a second intermediate rolling mill (R2) 19, a finish rolling mill ( F) 30 is arranged.

In the rolling line L shown in FIG. 1, the material A to be rolled, such as slab and bloom, heated in a heating furnace (not shown) (not shown) is sequentially rolled in the roughing mill 17 to the finishing mill 30. As a result, the hat-shaped steel sheet pile as the final product is manufactured.

Next, the drawings of the shape of the hole shape provided in any of the rough rolling mill 17, the first intermediate rolling mill 18, the second intermediate rolling mill 19, and the finishing rolling mill 30 arranged in the rolling line L in order from the upstream side. A brief description will be given with reference. In FIGS. 2 to 6 referred to in the following description, a cross section of the material A to be rolled when the reduction in each hole mold is completed is indicated by a one-dot chain line for reference.

FIG. 2 is a schematic cross-sectional view showing a hole shape of the first hole mold 49 (hereinafter also simply referred to as a hole mold 49). As shown in FIG. 2, the hole mold 49 includes an upper hole roll 45 and a lower hole roll 48. A hole die 49 constituted by the upper hole roll 45 and the lower hole roll 48 is provided in, for example, the roughing mill 17, and thickness reduction is performed on the entire material to be rolled A by hole rolling in the hole mold 49 (that is, Rough rolling) is performed. Specifically, hole rolling is performed such that a slab heated to a predetermined temperature in a heating furnace approximates a hat shape, and a rough material A1 indicated by a one-dot chain line in FIG. 2 is formed. The rough rolling at this time may be performed, for example, by reverse rolling in the same hole mold 49.

FIG. 3 is a schematic cross-sectional view showing a hole shape of a second hole mold 59 (hereinafter also simply referred to as a hole mold 59). As shown in FIG. 3, the hole mold 59 includes an upper hole roll 55 and a lower hole roll 58. A hole mold 59 composed of the upper hole roll 55 and the lower hole roll 58 is provided, for example, in the first intermediate rolling mill 18, and the thickness of the whole material A to be rolled is reduced by hole rolling in the hole mold 59 ( That is, the first intermediate rolling) is performed. In the hole mold 59, thickness reduction is performed at the same time as the nail height of the claw portions 14 and 15 is adjusted to a desired height. Specifically, the rough material A1 carried out from the hole mold 49 is further shaped into a hat. Pore rolling is performed so as to approximate the shape. Thereby, 1st intermediate material A2 shown to the dashed-dotted line in FIG. 3 is modeled. Note that the rolling here is performed, for example, by reverse rolling in the same hole mold 59.

FIG. 4 is a schematic cross-sectional view showing a hole shape of a third hole mold 69 (hereinafter also simply referred to as a hole mold 69). As shown in FIG. 4, the hole mold 69 includes an upper hole roll 65 and a lower hole roll 68. A hole die 69 constituted by the upper hole roll 65 and the lower hole roll 68 is provided, for example, in the second intermediate rolling mill 19, and thickness reduction is performed on the whole material to be rolled A by hole rolling in the hole die 69 ( That is, second intermediate rolling) is performed. Specifically, hole rolling is performed so that the first intermediate material A2 unloaded from the hole mold 59 is brought closer to a hat shape, and the second intermediate material A3 indicated by the one-dot chain line in FIG. 4 is formed. The Since the hole mold 69 has a shape in which both end portions in the width direction are open, the claw portions 14 and 15 of the material A to be rolled have a shape extending in the width direction due to thickness reduction. Note that the rolling here is performed, for example, by reverse rolling in the same hole mold 69.

FIG. 5 is a schematic sectional view showing a hole shape of a fourth hole mold 79 (hereinafter also simply referred to as a hole mold 79). As shown in FIG. 5, the hole mold 79 includes an upper hole roll 75 and a lower hole roll 78. A hole die 79 constituted by the upper hole roll 75 and the lower hole roll 78 is provided in, for example, the second intermediate rolling mill 19, and the claw portions 14 and 15 of the material A to be rolled are formed by the hole die 79, for example. It is done with emphasis. Specifically, the second intermediate material A4 is formed by performing the reduction so that the claw heights of the claw portions 14 and 15 in the state extended by the third hole mold 69 are aligned to a desired height. . Note that the rolling here may reduce the thickness.

FIG. 6 is a schematic sectional view showing a hole shape of a fifth hole mold 89 (hereinafter also simply referred to as a hole mold 89). As shown in FIG. 6, the hole mold 89 includes an upper hole roll 85 and a lower hole roll 88. A hole mold 89 constituted by the upper hole roll 85 and the lower hole roll 88 is provided in the finishing mill 30, for example, and the claw portions 14 and 15 are mainly bent with respect to the material A to be rolled by the hole mold 89. Molding (ie, finish rolling) is performed. Specifically, the second intermediate material A4 is subjected to reduction using a finishing material A5 having a substantially hat shape (substantially hat-shaped steel sheet pile product shape). Note that finish rolling is usually not performed by reverse rolling but by rolling of only one pass.

As described above, in each rolling described with reference to FIGS. 2 to 6, the material A to be rolled is pierced and finally the finishing material A5 is formed.

Note that the configurations of the first to fifth hole molds described above in the present embodiment are merely examples, and are not limited to the illustrated forms. For example, the arrangement order of the hole molds, each rolling mill, The shape of the holes and the increasing / decreasing arrangement of the modified hole types of various hole types can be changed as appropriate according to conditions such as equipment conditions and product dimensions. Further, depending on the type of material, it is conceivable to separately provide a hole mold such as a preformed hole mold used in the rough modeling process from the material.

According to the study by the present inventors, in the intermediate rolling process using the hole mold 59 and the hole mold 69 in the above manufacturing process, the rolling is performed while maintaining the balance between the extension of the web corresponding part 3 and the flange corresponding parts 5 and 6. 3 and 4, since the upper and lower hole rolls have different upper and lower roll diameters depending on the part, the relative sliding speed between the material to be rolled A (particularly the flange-corresponding portions 5 and 6) and the roll is the part. It depends on. In the flange-corresponding portions 5 and 6, in a portion where the difference between the upper and lower roll diameters is large, the elongation of the material to be rolled is suppressed by the peripheral speed difference between the upper and lower rolls. , Described as “Neutral Line”), it is easy for elongation to occur. Therefore, the flange near the neutral line of the roll bite tends to generate compressive stress in the longitudinal direction. 5 and 6 have a shape defect called a so-called flange wave.

In particular, in the manufacture of a large steel sheet pile such as a hat-shaped steel sheet pile with a large flange width / flange thickness ratio, the elongation of the flange near the neutral line tends to be relatively large relative to the elongation of the web. , 6 is subjected to a compressive stress in the longitudinal direction from the inside of the roll bite. Further, the buckling limit stress is also reduced, and as a result, the flange wave is likely to be remarkably generated.
When performing one pass rolling with the same hole shape, flange waves can be suppressed by designing the shape of the hole shape in consideration of flange stretching and web stretching in relation to the shape of the previous hole shape. However, when rolling with two or more passes with the same hole mold, the stretching of the web corresponding portion, the flange corresponding portion, and the arm corresponding portion is defined by the shape of the hole shape in the second and subsequent passes. Thus, it has been found that even if the hole shape is designed as described above, the generation of the flange wave during reverse rolling cannot be suppressed. For example, when reverse rolling is performed with these hole molds 59 and 69, in the flange corresponding parts 5 and 6, meat gathers at the center part (near the neutral line) of these flange corresponding parts 5 and 6 every time rolling is performed, and the flange thickness As a result of examination, it became clear that a phenomenon such as restoration of data is likely to occur. When the restoration of the thickness occurs, the flange extension in the next pass increases, and a flange wave is likely to be generated, which is not preferable.

Further, when comparing the hole mold 59 and the hole mold 69, the hole mold 69, which is the latter hole mold, rolls the material to be rolled A (especially the flange-corresponding portions 5 and 6) more thinly. Form defects such as occurrence tend to be remarkable. In addition, in the process closer to finish rolling, when a shape defect occurs, it tends to be directly connected to a product shape defect. That is, from the viewpoint of product dimensional accuracy and rolling stability, it is important to solve the above-described problems particularly in the hole mold 69 which is the latter hole mold.

In view of such problems, the present inventors have intensively studied the shapes of the hole molds 59 and 69 described with reference to FIGS. Invented a hole shape that satisfies the above conditions. In the following, the detailed shape of the hole mold 69 ′ is described with reference to the drawings, in which the shape of the hole mold 69 is further improved so that the flange wave is not generated. In the following, although illustrated and described by taking as an example the rolling modeling of the hole die 69 ′, particularly the flange-corresponding portion 6, the hole die targeted in the present invention performs thickness reduction on the whole material A to be rolled. It is a hole type, and is not limited to the hole types 59 and 69.

FIG. 7 is a schematic explanatory view of a hole mold 69 ′ having an improved configuration of the third hole mold 69. FIG. 7A is a schematic overall view, and FIG. 7B is a portion facing the flange corresponding portion 6. The enlarged view of the vicinity (the part enclosed with the broken line in Fig.7 (a)) is shown. Here, FIG. 7B shows a state after rolling in the hole mold 69 ′, and the rolled material A is shown by a one-dot chain line. In FIG. 7, components having the same functional configuration as the hole mold 69 described with reference to FIG. 4 are denoted by the same reference numerals, and description thereof is omitted.

In the improved hole mold 69 ′ shown in FIG. 7, the facing portion 100 facing the flange-corresponding portion 6 of the material to be rolled A is different in shape from the hole mold 69, specifically, the side closer to the web. In this order, it is composed of a plurality of flange facing portions 100a, 100b, 100c having different inclinations. Regarding these flange facing portions 100a, 100b, and 100c, in this specification, the flange facing portion 100b is referred to as a “first flange facing portion”, and the flange facing portions 100a and 100c disposed on both sides thereof are referred to as “second flange facing portions”. It may be defined and referred to as “third flange facing portion”. Moreover, the part of the flange corresponding part 6 formed by rolling by the flange facing part 100b located at the center is referred to as “first flange part”, and each part of the flange corresponding part 6 disposed on both sides thereof (by the flange facing parts 100a and 100c). The part to be rolled and shaped) may be defined and referred to as “second flange part” and “third flange part”.
In addition, as shown to Fig.7 (a), about the part 101 which opposes the flange corresponding | compatible part 5 of the to-be-rolled material A, it is similarly comprised from the flange opposing part 101a, 101b, 101c.

The inclination angles of the flange facing portions 100a, 100b, and 100c with respect to the horizontal line are θf2, θf1, and θf3, respectively, and θf1 is larger than θf2 and θf3. Also, θf2 and θf3 may be equal angles. Spaces tf2, tf1, and tf3 (also referred to as roll gaps) between the upper hole roll 65 and the lower hole roll 68 in the flange facing portions 100a, 100b, and 100c are respectively constant (upper hole roll 65 and lower hole roll 68). Are opposite to each other, the angles θf2, θf1, and θf3 of the upper hole roll 65 and the lower hole roll 68 are equal. On the other hand, when the angle between the flange facing portions 100a, 100b and 100c and the horizontal line is different between the upper hole roll 65 and the lower hole roll 68, the angles θf2, θf1 and θf3 are the same as those of the upper hole roll 65 and lower hole roll 68. What is necessary is just to set it as the average value of the angle which a flange opposing part and a horizontal line make. The inclination angles θf2, θf1, and θf3 are substantially the same even if they are defined by the angle formed by the center line S and the horizontal line in the roll gap of the upper and lower hole type rolls.
Further, the flange facing portion 100b is configured at a position so as to straddle the neutral line O in the height direction. The flange facing portion 100a is positioned closer to the web than the flange facing portion 100b, and is close to the arm (joint). The flange facing portion 100c is located on the side. That is, the flange facing portion 100b is positioned so as to straddle the neutral line O, and the flange facing portions 100a and 100c are positioned on both sides thereof.

Here, the stretching per pass is defined by the ratio of the thickness before rolling to the thickness after rolling (after 1 pass), and the thickness is represented by the roll gap in the plate thickness direction in the hole die 69 ′. When the amount of roll gap reduction in the vertical direction of one pass during reverse rolling is Δg, the stretching λf1, λf2, and λf3 per pass of the flange facing portions 100b, 100a, and 100c are expressed by the following equations (1) to (3 ).
λf1 = tf′1 / tf1 = (tf1 + Δg · cos θf1) / tf1 (1)
λf2 = tf′2 / tf2 = (tf2 + Δg · cos θf2) / tf2 (2)
λf3 = tf′3 / tf3 = (tf3 + Δg · cos θf3) / tf3 (3)
Here, tf′1, tf′2, and tf′3 are roll gaps corresponding to the thickness before rolling of the flange corresponding portions 6 corresponding to the flange facing portions 100b, 100a, and 100c in the hole mold 69 ′. . Further, tf1, tf2, and tf3 are roll gaps corresponding to the thicknesses of the flange corresponding portions 6 that are rolled in the flange facing portions 100b, 100a, and 100c in the hole mold 69 ′.
That is, by setting θf1 to an angle larger than θf2 and θf3 based on the relationship between tf1, tf2, and tf3, the following formulas (4) and (5) are satisfied in rolling with the hole mold 69 ′.
λf1 <λf2 (4)
λf1 <λf3 (5)
Here, the above formulas (1) to (3) show the stretching per one pass of rolling, but the formulas (1) to (3) also apply to the case of total stretching in reverse rolling performed in a plurality of passes. The same relationship as in 3) is established. Therefore, in the hole mold 69 ′, by setting θf1 to an angle larger than θf2 and θf3, not only in the case of stretching per pass, but also in the case of total stretching in multiple passes during reverse rolling, the above Expressions (4) and (5) are satisfied.

The material A to be rolled formed by the hole mold 69 ′ has a bent shape having a plurality of inclination angles at the flange corresponding parts 5 and 6. This shape is a hole type downstream of the hole mold 69 ′ provided in the intermediate rolling mill, for example, the fourth hole mold 79, the fifth hole mold 89 of the finishing mill 30 (finish rolling process), or those. A desired flat flange shape (a flange shape of a hat-shaped steel sheet pile product) is obtained by both hole types. In such flange flattening, reverse rolling is not performed. In addition, after bending back of the flange part, there may be a streak-like trace in the longitudinal direction due to the difference in the scale adhesion state with the other part at the boundary part of the bent part. It does not reduce the strength of the part, and does not affect the quality of the steel sheet pile.

According to the hole type configuration as shown in FIG. 7, the flange extension in the vicinity of the neutral line O in which compressive stress is likely to occur by increasing the angle θf <b> 1, and the hole type 69 with the flange-facing portion as shown in FIG. The effect of suppressing the generation of the flange wave is realized by lowering relative to the flange extension at a position distant from the neutral line O. On the other hand, by reducing the angles θf2 and θf3, an increase in the height of the flange is suppressed, and the extension of the cross section of the flange corresponding portion 6 is maintained. For example, with respect to the angle θf1 determined as the flange wave suppression condition, in consideration of suppression of dimensional variations when forming a desired flat flange shape by rolling with the latter-stage hole mold, the flange facing portion (100a of the hole mold 69 ′) is considered. , 100b, 100c), the angle θf2 and θf3 should be designed so that the length of the center line S corresponding to the flange 69 of the hole mold 69 is the same as the length of the center line and the horizontal position of the joint does not change. It ’s fine. That is, when reverse rolling is performed with the improved hole mold 69 ′, the flange extension is reduced in the flange facing portion 100b as compared to the hole mold 69 shown in FIG. 4, but the flange facing portions 100a and 100c are compared with the hole mold 69. Since the flange extension increases, the flange as a whole can maintain the same flange cross-section extension as the hole mold 69. In addition, if the line length of the center line S corresponding to the flange facing part (100a, 100b, 100c) of the hole mold 69 ′ is the same as the line length of the center line of the flange facing part of the hole mold 69, it means completely the same. However, it is sufficient that the error is within the same range (for example, less than ± 1% with respect to the length of the center line of the flange facing portion).

Here, in order to suppress the flange wave in the flange facing portion 100b in the vicinity of the neutral line O (hereinafter also referred to as the steeply inclined portion 100b), the flange extension λf1 in the steeply inclined portion 100b and the web corresponding portion 3 are used. It is preferable to set the angle θf1 so that the relationship with the stretching λw satisfies the following formula (6).
λf1 ≦ λw (6)
As a more detailed condition, it is desirable that λf1 / λw per path be within a range of 0.967 ≦ λf1 / λw ≦ 1.000. The reason for this numerical value will be described in an embodiment described later.
Since the extension of the flange is strongly affected by the extension of the web, the extension of the flange corresponding part in the vicinity of the neutral line O is expressed in relation to the extension of the web in the technique of the present invention. In the case of a hat-shaped steel sheet pile, it is considered that the extension of the arm corresponding portions 8 and 9 and the extension of the web corresponding portions 5 and 6 are substantially equal, and since the U-shaped steel sheet pile has no arm corresponding portion, the vicinity of the neutral line O The extension of the flange-corresponding portion can be substantially expressed in relation to the web extension. The stretching λw of the one-pass web during reverse rolling is expressed by the following formula (7).
λw = tw ′ / tw = (tw + Δg · cos θw) / tw (7)
Here, tw ′ is a roll gap corresponding to the thickness before rolling of the web corresponding portion 3 in the hole mold 69 ′. Moreover, tw is a roll gap corresponding to the thickness of the web corresponding part 3 rolled by the hole mold 69 ′. Further, θw is an inclination angle with respect to the horizontal line of the roll gap corresponding to the web corresponding portion 3.

Further, in the case of a hat-shaped steel sheet pile having a constant thickness in the flange width direction, the thicknesses of the flange facing portions 100a, 100b, and 100c in the final pass are excluded in the hole die 69 ′ immediately before finish rolling, except for errors due to roll wear and the like. Although the hole shape is designed such that the inclination angle θf1 of the flange facing portion 100b is different from the inclination angles θf2 and θf3 of the flange facing portions 100a and 100c, each thickness of the intermediate path of the hole mold 69 ′ is different. It will not be constant. Therefore, considering the stretch ratios λf1 / λw, λf2 / λw, and λf3 / λw in the path where the flange wave is most likely to occur due to the relationship between the thickness and stretch of each flange facing portion and the stretch of the web corresponding portion, The inclination angle and width of the facing portion may be determined.

As described above, by increasing the inclination angle θf1 of the steeply inclined portion 100b, the flange extension in the vicinity of the neutral line O can be reduced, and the compressive stress generated in this portion can be reduced.

As described above with reference to FIG. 7, the hole shape of the hole mold 69 ′ provided in the second intermediate rolling mill 19 is a shape having a plurality of flange facing portions 100a, 100b, 100c having different inclination angles. By setting the inclination angles of the flange facing portions 100a, 100b, and 100c to suitable conditions as shown in the above formulas (1) to (6), the flange corresponding portions in the rolling modeling with the hole 69 ' It is possible to reduce the compressive stress generated in the vicinity of the neutral line O of 6 and suppress the generation of the flange wave. Furthermore, it is possible to reduce the restoration of the flange thickness in which meat gathers in the vicinity of the neutral line of the flange-corresponding portion 6 in reverse rolling, and the generation of flange waves is further suppressed.

On the other hand, the extension of the flange that occurs in the flange facing portions 100a and 100c is relatively increased compared to the extension of the flange that occurs in the vicinity of the neutral line O (that is, the extension of the flange in the flange facing portion 100b). Although the compressive stress which arises also increases, in addition to being away from the neutral line O, since the metal flow to the web corresponding | compatible part 3 and the arm corresponding | compatible part 9 is easy to produce, compressive stress does not become excessive. Further, in the flange corresponding portion 6, the portions corresponding to the flange facing portions 100 a and 100 c are connected to the web corresponding portion 3 and the arm corresponding portion 9 and are not easily buckled. Hard to do.

In this way, the hole shape of the hole mold 69 'is a shape having a plurality of flange facing portions 100a, 100b, 100c having different inclination angles, so that the conventional hole shape (hole) shown in FIG. Compared with rolling modeling with the die 69), it is possible to suppress the flange wave generated near the neutral line O of the flange-corresponding portions 5 and 6 of the material A to be rolled, thereby improving the product dimensional accuracy and rolling stability. Is done. Depending on the product shape, in the conventional hole shape (hole shape 69) as shown in FIG. 4, the extension of the flange corresponding portions 5 and 6 is larger than the extension of the web corresponding portion 3, and the balance can be maintained. In some cases, the flange wave cannot be suppressed. In that case, instead of changing the inclination angle of the entire flange, as shown in FIG. 7, the inclination angle θf1 of the steeply inclined portion 100b is made larger than the flange inclination angle of the conventional hole shape, and the flange facing portion 100a and By making it larger than 100c, an increase in the height of the material A to be rolled during rolling modeling can be suppressed, and the flange wave can be effectively suppressed.

As mentioned above, although an example of embodiment of this invention was demonstrated, this invention is not limited to the form of illustration. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

For example, in the above-described embodiment, the subject to which the technique of the present invention is applied and the hole shape is improved is described as the third hole 69, and particularly regarding the rolling shaping of the flange corresponding portion 6 of the material A to be rolled, FIG. However, the scope of application of the present invention is not limited to this. That is, in the rolling modeling with the third hole mold 69, the present invention can be applied to both the flange corresponding portions 5 and 6, and can also be applied to the rolling modeling of the second hole mold 59. That is, the same improvement can be applied to the hole mold 59 described with reference to FIG. 3 to suppress, for example, a flange wave generated in the first intermediate rolling. Naturally, the technique of the present invention may be applied to the hole shape of both the second hole mold 59 and the third hole mold 69. Alternatively, with respect to the second hole mold 59 and the third hole mold 69 whose main components are thickness reduction, the second hole mold 59 has a hole shape in which both ends in the width direction are opened, and the third hole mold 69 is provided. The same improvement can be applied to the case where the hole shape is such that the nail height is simultaneously formed. Furthermore, you may apply to the 1st hole type which performs rough rolling.

In the above embodiment, the hole shape of the hole mold 69 ′ has been described as a shape having a plurality of flange facing portions 100a, 100b, and 100c having different inclination angles, but the important point of the technology of the present invention is that In the hole mold for performing intermediate rolling, the inclination angle θf1 of the flange facing portion 100b in the vicinity of the neutral line O is set to a larger angle than that of other flange facing portions, and the compressive stress acting on the material A to be rolled is reduced in the vicinity of the neutral line O. There is to make it. From this point of view, in the technique of the present invention, when the hole shape of the intermediate rolling mill is configured as a shape having a plurality of flange facing portions having different inclination angles, the three flange facing portions as shown in FIG. There is no need, and as long as the inclination angle θf1 of the flange facing portion 100b in the vicinity of the neutral line O is larger than that of other flange facing portions, any number of flange facing portions having different inclination angles may be used. That is, for example, as shown in FIG. 10, a hole mold for performing intermediate rolling may be configured to have four or more flange facing portions having different inclination angles.

Moreover, in the hole-shaped part (namely, flange opposing part 100) facing the flange corresponding parts 5 and 6 of the material A to be rolled, the boundary part on the arm side (of the material to be rolled) and the web side (of the material to be rolled) With respect to the straight line connecting the boundary portion, it is convex in the flange inner side on the arm side from the flange facing portion near the neutral line O, and is convex in the flange outer direction on the web side from the flange facing portion in the vicinity of the neutral line O. May be.

Specifically, with respect to the shape of the flange facing portion 100 provided with the steeply inclined portion 100b described in the above embodiment, the shapes of the flange facing portions 100a to 100c do not necessarily have to be linear. If the inclination angles of the flange facing portions 100a, 100b, and 100c are in a suitable condition as shown in the above formulas (4) to (6), for example, part or all of the flange facing portions 100a to 100c are curved. It may be constituted by. In this case, the steeply inclined portion 100b is defined as a range between the intersection with the flange facing portion 100a and the intersection with the flange facing portion 100c, and the steeply inclined portion 100b is configured to straddle the neutral line O.
FIG. 8 is a schematic explanatory view according to a modification of the present invention, and is a schematic enlarged view showing an example of the vicinity of a portion facing the flange corresponding portion 6. As shown in FIG. 8, in this modification, the flange facing portions 100a and 100c are configured in a curved shape. The process of performing reverse rolling, including other embodiments, includes at least a web corresponding portion 3 connected to a flange portion (also referred to as a web side flange portion) including at least one second flange portion, and a third flange portion. It is preferable to include a step of forming an arm corresponding portion 9 connected to a flange portion (also referred to as an arm side flange portion) including one. In this case, the hole mold according to the present invention preferably includes a web facing portion 100 d for forming the web corresponding portion 3 and an arm facing portion 100 e for forming the arm corresponding portion 9. Here, the hole type includes a web side flange facing portion group including at least one flange facing portion 100a (second flange facing portion) and an arm side flange including at least one flange facing portion 100c (third flange facing portion). It is preferable to provide an opposing portion group. Here, the boundary between the web side flange facing portion group and the web facing portion 100d is Pa, and the boundary between the arm side flange facing portion group and the arm facing portion 100e is Pc.
In the example shown in FIG. 8, the arm side boundary portion Pc (the boundary between the arm facing portion 100e and the flange facing portion 100c facing the arm corresponding portion 9) and the web side boundary Pa (the web corresponding portion in the hole 65). 3, the flange facing portion 100 a has a curved shape that protrudes outwardly from the flange, and the flange facing portion 100 c has a flange shape with respect to the straight line Q connecting the web facing portion 100 d and the flange facing portion 100 a. The curved shape is convex in the inner direction. In the present modification, the steeply inclined portion 100b is illustrated as a linear shape, but the steeply inclined portion 100b may be curved.

When the flange facing portions 100a and 100c as shown in FIG. 8 are curved, the inclination angles θf2 and θf3 of the flange facing portions 100a and 100c are tangents at the center in the height direction of the flange facing portions 100a and 100c with respect to the horizontal line. What is necessary is just to determine with the inclination angle of (Qa, Qc in FIG. 8). When the steeply inclined portion 100b has a curved shape, the inclination angle may be determined based on the tangent line that maximizes the angle. In FIG. 8, the straight line Q and the tangent lines Qa and Qc have been described with the lower hole type roll 68, but the upper hole type 65 roll may be determined in the same manner. In addition, when the angle between the flange facing portions 100a, 100b, 100c and the horizontal line is different between the upper hole roll 65 and the lower hole roll 68, θf2, θf1, and θf3 are the upper hole roll 65 and the lower hole roll 68, respectively. What is necessary is just to set it as the average value of the angle which a flange opposing part and a horizontal line make. Regarding the inclination angles of the flange facing portions 100a to 100c defined in this way, as in the above embodiment, by setting to suitable conditions as shown in the above formulas (1) to (6), Similar effects can be obtained.

That is, in the above embodiment, the hole shape of the hole mold 69 ′ is described as a shape having a plurality of flange facing portions 100a, 100b, 100c having different inclination angles, and details of the portions 100a, 100b, 100c are described. There is no mention of any special shapes. The shapes of the flange corresponding portions 5 and 6 may be configured by a plurality of straight lines or curves, or a combination of both, and the shapes of the portions 100a, 100b, and 100c can be arbitrarily designed according to the shapes. If a curved portion is formed in the flange corresponding portions 5 and 6, the inclination angle of the curved portion may be defined by the angle of the tangent line.

In addition, the flange-corresponding part has a thickness distribution in which the thickness changes in the direction along the surface of the flange-corresponding part, or a plurality of bends in which the flange-corresponding part has a large inclination angle near the neutral line. It is very effective to apply to a product having a shape having a portion, and is included in the scope of the present invention. When the flange-corresponding portion has a thickness distribution in the direction along the surface, it is conceivable to relatively reduce the thickness in the vicinity of the neutral line from the cross-sectional efficiency of the hat-shaped steel sheet pile product. When the technique of the present invention is applied in such a case, the flange-facing portion 100b has a larger inclination angle than the flange-facing portions 100a and 100c. Therefore, the flange extension at the flange-facing portion 100b is larger than that of the conventional hole shape. It is hard to become, and the effect similar to the said embodiment or more is acquired. In addition, for steel sheet pile products in which the flange is bent so that the inclination angle increases in the vicinity of the neutral line in the product shape, the rolling state in the bent shape shown in FIGS. 7 and 8 can be applied to the product shape. Useful for.

Further, in the hole shape of the hole mold 69 ′, the boundary portions of the flange facing portions 100 a, 100 b, 100 c may have R. In that case, the boundaries of the portions 100a, 100b, and 100c may be intermediate points of the corner R.

Further, as a result of detailed studies by the present inventors, the flange wave generated in the conventional hole 69 has a peak position of the wave height in the cross section of the flange corresponding portion, and the neutral line of the hole 69 shown in FIG. It became clear that it was included in the range of 10% of the hole mold depth D in the height direction from O. Therefore, when the steeply inclined portion 100b near the neutral line O is a straight line, as shown in FIG. 11, the steeply inclined portion 100b that reduces the flange extension has a hole depth D up and down from the neutral line O in the height direction. It is desirable to include a range of 10%. In addition, when the midpoint position Fc of the line segment in the steeply inclined portion 100b of the center line S coincides with the neutral line O, the functions and effects described in the above embodiment are remarkably obtained. The hole mold depth D is defined by the vertical height of the entire flange facing portion (100a, 100b, 100c) of the pilot hole roll forming the hole mold, and as shown in FIG. The upper end position of the height D is the upper end in the height direction of the boundary between the flange corresponding portion and the arm corresponding portion, and the lower end position is the lower end in the height direction of the boundary between the flange corresponding portion and the web corresponding portion.

Further, even when the flange facing portion 100b near the neutral line O is a curve or a combination of a plurality of line segments, as shown in FIG. 12, the steeply inclined portion 100b (range P1 to P2 in the figure) It is desirable to include a range of 10% of the hole depth D in the vertical direction from the neutral line O. In these cases, in the line segment corresponding to the steeply inclined portion 100b in the center line S, the above-described effect is more remarkable when the position Fd at which the angle with respect to the horizontal line is maximum coincides with the neutral line O. However, as shown in FIG. 12, if the position Fd is in the range of 10% of the hole depth D, the effect of the present invention can be enjoyed even if the position Fd is deviated from the neutral line O in the height direction. This is also the same reason as that when the flange facing portion 100b is a straight line. In this case, the inclination angle at the position of the maximum inclination angle may be θf1, and the flange extension may be λ1. Therefore, these cases are also included in the scope of the present invention as the vicinity of the neutral line.

In the above embodiment and other embodiments, the case where the second flange facing portion and the third flange facing portion are disposed adjacent to the first flange facing portion has been described. However, they are not necessarily adjacent to each other. There is no need to be placed. That is, the second flange facing portion and the third flange facing portion have an inclination angle smaller than that of the first flange facing portion, and are respectively between the first flange facing portion and the web facing portion, and between the first flange facing portion and the arm facing. It can also set between parts according to a product shape.

In the above-described embodiment and other embodiments, the case where the hat-shaped steel sheet pile is rolled is illustrated and described as an example, but the scope of application of the present invention is not limited to this. That is, the present invention is applicable to steel sheet piles having variously shaped flanges that may generate flange waves in intermediate rolling. Specifically, it can be applied to a U-shaped steel sheet pile in addition to a hat-shaped steel sheet pile.

Example 1
As Example 1 of the present invention, a hole mold corresponding to the improved hole mold 69 ′ described above with reference to FIG. 7 is an intermediate rolling hole mold (the second hole mold and the third hole mold in the above embodiment). And rolled molding of the material to be rolled was performed under conditions 1 to 5 shown in Table 1 below.
The hole-facing flange-facing portion is bent into three portions so that the first flange portion straddles the hole-type neutral line shown in Conditions 1 to 5. Here, the angle and length of each flange facing portion were adjusted. In addition, the flange-corresponding portion of the material to be rolled after the rolling shaping is flattened by the subsequent hole shape (the fourth hole shape and the fifth hole shape in the above embodiment).

Further, as a comparative example, a conventional hole shape (hole shape corresponding to the hole shape 69 before improvement) is applied to the intermediate rolling hole shape, and the rolling shaping of the material to be rolled is performed under conditions 6 and 7 shown in Table 1 below. Carried out.

Roll forming with a hole mold under the conditions shown in each of the conditions 1 to 7 is performed by a plurality of passes, and the flange / web stretch ratios λf1 / λw, λf2 / λw, and λf3 / λw shown in Table 1 are formed by a plurality of passes. Is the stretch ratio per pass. In the examples and comparative examples, the flange angle θf of the hat-shaped steel sheet pile product as the final product to be manufactured was set to 48 °. FIG. 9 is an explanatory diagram of the present embodiment, and is a schematic cross-sectional view showing the state of the final pass of the rolling shaping with the third hole mold according to the embodiment. In FIG. 9, the shape of the flange facing portion having the same flange angle θf = 48 ° as that of the final product is shown by a broken line. The values such as the symbols θf1, θf2, and θf3 shown in Table 1 are the values shown in FIG.

As shown in Table 1, in each of the conditions 1 to 5, when forming the steeply inclined portion in the hole mold, the values of the angles θf1, θf2, and θf3 are changed as shown in Table 1, and intermediate rolling is performed under each condition. It was. And after that, the flange corresponding | compatible part of the to-be-rolled material roll-modeled on each condition was shape | molded in the linear form (flat shape) with the subsequent rolling mill, and shape defects, such as the presence or absence of generation | occurrence | production of a flange wave, were confirmed.

Under conditions 1 to 5, since the steeply inclined portions satisfying θf1> θf2 and θf1> θf3 are formed in the hole mold, λf1 <λf2, λf1 <λf3, and the value of λf1 / λw is 0.967 to 1.004. It has become. Under such conditions, the flange stretching at the steeply inclined portion was reduced and the generation of the flange wave was suppressed. For conditions 1 to 4, the value of λf1 / λw was 0.967 to 1.000 so as to satisfy the above formula (6), and it was confirmed that no flange wave was generated from the time of intermediate rolling. In addition, with respect to the condition 5, since it slightly deviated from the range of the above formula (6), a slight flange wave was confirmed in some passes during the intermediate rolling, but a flange wave was confirmed in the product after the subsequent rolling. Sufficient effects were confirmed.

On the other hand, in condition 6 (comparative example), since rolling shaping was performed without forming the steeply inclined portion in the hole mold, flange stretching λf1> web stretching λw, and the formula (6) described in the above embodiment is Since the rolling modeling was not satisfied, the generation of flange waves was confirmed.
Further, in condition 7 (comparative example), the product was rolled under the condition that the flange thickness of the product was increased to 1.2 mm and the value of λf1 / λw was 0.995 so as to satisfy the formula (6). In the same manner as in the above, the rolling shaping was performed without forming the steeply inclined portion in the hole mold, and hence the generation of the flange wave was confirmed.
That is, in the comparative examples of conditions 6 and 7, since the rolling shaping was performed under the condition that the inclination angle of the flange portion was constant at any position without forming the steeply inclined portion in the hole mold, the position of the flange portion ( The stretch was different depending on the part), and a flange wave was generated.
From the above, it can be seen that bending the hole-facing flange-facing portion into three portions suppresses the suppression of the flange wave and enables the manufacture of a size with a thin flange thickness.

The present invention can be applied to a manufacturing technique of a steel sheet pile having a flange such as a hat-shaped steel sheet pile or a U-shaped steel sheet pile.

DESCRIPTION OF SYMBOLS 1 ... Rolling equipment 3 ... Web corresponding part 5, 6 ... Flange corresponding part 8, 9 ... Arm corresponding part 10, 11 ... Joint corresponding part 14, 15 ... Claw part 17 ... Rough rolling mill 18 ... 1st intermediate rolling mill 19 ... Second intermediate rolling mill 30 ... Finishing rolling mill 45 ... (first hole type) upper hole type roll 48 ... (first hole type) lower hole type roll 49 ... first hole type 55 ... (second Upper hole type roll 58 ... (Second hole type) Lower hole type roll 59 ... Second hole type 65 ... (Third hole type) Upper hole type roll 68 ... (Third hole type) Lower hole type roll 69 ... third hole type 69 '... improved third hole type 75 ... (fourth hole type) upper hole type roll 78 ... (fourth hole type) Lower hole type roll 79 ... Fourth hole type 85 ... (Fifth hole type) upper hole type roll 88 ... (Fifth hole type) lower hole type roll 89 ... Fifth hole type 100 ... Pair Portions 100a ~ 100c ... flange facing portion 101a ~ 101c ... flange facing portion A (A1 ~ A5) ... the rolled material L ... rolling line O ... neutral line

Claims (16)

1. A manufacturing method for forming a steel sheet pile having a flange from a material to be rolled by perforated roll rolling,
   Comprising the step of performing reverse rolling on the material to be rolled with the same hole mold,
   The step of performing the reverse rolling includes a step of forming a first flange portion straddling a neutral line and second and third flange portions disposed on both sides of the first flange portion,
   The hole mold includes a first flange facing portion for forming the first flange portion, a second flange facing portion for forming the second flange portion, and a first flange for forming the third flange portion. 3 flange facing parts,
   The method of manufacturing a steel sheet pile having a flange, wherein an inclination angle of the first flange facing portion with respect to a horizontal plane is larger than an inclination angle of the second and third flange facing portions.
2. The step of performing the reverse rolling includes a step of forming a web corresponding part and an arm corresponding part,
   The hole mold includes a web-facing portion for forming the web-corresponding portion and an arm-facing portion for forming the arm-corresponding portion,
   The hole type includes a web side flange facing portion group including at least one second flange facing portion, and an arm side flange facing portion group including at least one third flange facing portion.
   For a straight line connecting a boundary portion between the web side flange facing portion group and the web facing portion, and a boundary portion between the arm side flange facing portion group and the arm facing portion,
   The second flange facing portion is convex in the flange outer direction,
   The method for manufacturing a steel sheet pile having a flange according to claim 1, wherein the third flange facing portion has a convex shape in a flange inner direction.
3. In the hole type, rolling is performed such that the flange extension λf1 in the first flange portion is smaller than the flange extensions λf2 and λf3 in the second flange portion and the third flange portion. A method for producing a steel sheet pile having the flange according to 2.
4. The flange according to any one of claims 1 to 3, wherein the step of forming the first flange portion, the second flange portion, and the third flange portion is an intermediate rolling step. Manufacturing method of steel sheet pile.
5. The method of manufacturing a steel sheet pile having a flange according to claim 4, wherein the hole mold has a hole shape in which both end portions in the width direction are opened.
6. The bent flange-corresponding portion formed on the material to be rolled by the step of forming the first flange portion, the second flange portion, and the third flange portion is formed into a desired flat shape by rolling in the latter-stage hole mold of the step. The method for producing a steel sheet pile having a flange according to any one of claims 1 to 5, wherein the steel sheet pile is formed into a shape by rolling.
7. The flange according to any one of claims 1 to 6, wherein in the hole mold, rolling is performed so that a flange stretch λf1 in the first flange portion is equal to or less than a web stretch λw. The manufacturing method of the steel sheet pile which has.
8. The method for producing a steel sheet pile having a flange according to any one of claims 1 to 7, wherein the steel sheet pile is a hat-shaped steel sheet pile.
9. A manufacturing facility for forming a steel sheet pile having a flange from a material to be rolled by perforated roll rolling,
   It comprises a rolling mill that performs reverse rolling on the material to be rolled with the same hole shape,
   The rolling mill that performs the reverse rolling includes a first flange portion that straddles a neutral line, and a hole mold that forms second and third flange portions disposed on both sides of the first flange portion,
   The hole mold includes a first flange facing portion for forming the first flange portion, a second flange facing portion for forming the second flange portion, and a first flange for forming the third flange portion. 3 flange facing parts,
   The equipment for manufacturing a steel sheet pile having a flange, wherein an inclination angle of the first flange facing portion with respect to a horizontal plane is larger than an inclination angle of the second and third flange facing portions.
10. The rolling mill that performs the reverse rolling includes a web-corresponding part and a hole mold that forms an arm-corresponding part,
    The hole mold includes a web-facing portion for forming the web-corresponding portion and an arm-facing portion for forming the arm-corresponding portion,
    The hole type includes a web side flange facing portion group including at least one second flange facing portion, and an arm side flange facing portion group including at least one third flange facing portion.
    For a straight line connecting a boundary portion between the web side flange facing portion group and the web facing portion, and a boundary portion between the arm side flange facing portion group and the arm facing portion,
    The second flange facing portion is convex in the flange outer direction,
    The equipment for manufacturing a steel sheet pile having a flange according to claim 9, wherein the third flange facing portion has a convex shape in the flange inner direction.
11. The flange type λf1 in the first flange portion is smaller than the flange extensions λf2 and λf3 in the second flange portion and the third flange portion in the hole mold, respectively. Equipment for manufacturing steel sheet piles with flanges.
12. The steel sheet pile manufacturing equipment having a flange according to any one of claims 9 to 11, wherein the hole mold is a hole mold provided in an intermediate rolling mill.
13. 13. The steel sheet pile manufacturing equipment having a flange according to claim 12, wherein the hole mold has a hole shape in which both end portions in the width direction are opened.
14. Subsequent holes for rolling and shaping the bent flange-corresponding part formed on the material to be rolled into a desired flat shape by rolling with a hole mold that forms the first flange part, the second flange part, and the third flange part. The steel sheet pile manufacturing equipment having a flange according to any one of claims 9 to 13, further comprising a mold.
15. The equipment for producing a steel sheet pile having a flange according to any one of claims 9 to 14, wherein in the hole mold, a flange extension λf1 in the first flange portion is a web extension λw or less. .
16. The steel sheet pile manufacturing equipment having a flange according to any one of claims 9 to 15, wherein the steel sheet pile is a hat-shaped steel sheet pile.

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