JPH09192702A - Manufacture of channel with projection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an efficient economical method for manufacturing a channel with a projection, a cross section in the width direction of which is approximately an F-shape and which is used for rails for a magnetically levitated linear motor car transportation systems by normal conduction. SOLUTION: Using vertically asymmetrically grooved rolls, 1) a base stock is made into a rough formed material 11 having an approximately H-shape in the cross section in the width direction. 2) Using vertically and horizontally asymmetrically grooved rolls, the rough formed material is made into approximately an h-shape by disappearing by reducing one side of a 1st flange 101 and feeding steel in that part into the other part. 3) To preventing the generation of bend (camber) at the time of cooling after the completion of rolling, in the middle of that process, partial cooling is executed in the vicinity of the 2nd joined part 205 of the triple point of the approximate h-shape for making temp. difference in the interior of a slab not more than a certain value, 4) using the vertically and horizontally asymmetrically grooved rolls, bending work is added to the 3rd deformed flange of the projected part upward the approximately h-shape in the extended direction of the width direction of the web 200 and the cross section of approximately F-shape is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rail for a normal electric magnetic levitation type linear motor car transportation system as shown in FIG. 6 in which a vertical cross section (hereinafter simply referred to as a cross section) is used. The present invention relates to a method for producing a substantially F-shaped grooved steel with projections (including a rotated shape and a line-symmetrical shape) that is asymmetrical to the left and right (hereinafter referred to as F-shaped steel).

[0002]

2. Description of the Related Art A normal magnetically levitated linear motor car transportation system (hereinafter referred to as "linear motor car transportation system" of this type in the present invention) has recently attracted attention as an application of F-section steel. It is also referred to as the linear motor car system.
A rail for a linear motor car system is referred to as a rail for a linear motor car. ) Has a rail used.

This linear motor car system has already entered the stage of practical use, and the number of rails used for the linear motor car system will be increased in the future. However, the linear motor car system has a completely different shape from the conventional rails and is required. The characteristics are also different.

FIG. 11 (a) is an overall sectional view of a linear motor car system, and FIG. 11 (b) is an enlarged sectional view of a rail and a main landing gear. 501 is a vehicle body, 502 is a rail, 5
03 is the main leg. This system is a type that lifts the vehicle body by the attractive force between the magnet on the ground side (or the rail itself may be the magnet itself) held on the rail and the magnet on the vehicle body side. It has a function of giving (by a reaction plate), floating (holding) the vehicle body at regular intervals, and laterally positioning the vehicle body.

Although these functions themselves are similar to those of a normal rail, the rail and the vehicle body side (the portion corresponding to the wheels of a conventional electric train) do not normally come into contact with each other. There is. Especially in this system, the rail is not supported from the bottom by the roadbed like the conventional rail, but the rail is extended to both sides of the main girder to hold the rail in the form of a cantilever as shown in the figure. Often, the shape becomes more complex.

FIG. 6 is a sectional view of the rail (according to the method of the present invention, that is, the rolling method). 400 is a reaction plate mounting portion (hereinafter referred to as plate mounting portion), and 401 is an outer lateral guide portion. (Hereinafter, referred to as an outer guide portion), 403 is a main girder connection portion, and 402 is an inner lateral guide portion (hereinafter, referred to as an inner guide portion).

The reaction plate gives thrust to the vehicle body, and the plate mounting portion is required to have sufficient flatness. The outer guide portion and the inner guide portion, together with the magnets on the vehicle body side, have the function of floating the vehicle body (positioning in the vertical direction) and the function of positioning in the horizontal direction. Since the main girder connecting portion has a function of fixing the rail to the main girder, the requirements for strength and toughness are particularly severe. Also, as a whole, high dimensional accuracy,
Of course, it is required that there is little bending or twisting.

The outer guide portion has a side surface inclined slightly downward (outside the main girder connection portion) from the lower surface of one end opposite to the main girder connection portion of the plate mounting portion. Have,
The cross section is a substantially parallelogram. The inner guide portion extends downward from the lower surface of one end of the plate mounting portion on the main girder coupling portion side, and has a trapezoidal cross section. The inclination of each side surface of the outer guide portion and the inner guide portion from the vertical direction is 5 to 15 °. This angle is necessary for roll pulling when manufactured by the rolling method.

The main girder connecting portion is slightly thinner than the plate mounting portion, and its upper and lower surfaces are parallel to the upper and lower surfaces of the plate mounting portion, respectively. The upper and lower surfaces of the main girder connecting portion are located on the inner guide portion side with respect to the upper and lower surfaces of the plate mounting portion.

Conventionally, it has been difficult to manufacture a shaped steel having a complicated shape which is asymmetrical in the left, right, up and down directions as described above. Steel materials such as H-section steel are manufactured by the rolling method, but most of them are symmetrical in the vertical and horizontal directions, and it is relatively easy to manufacture by the rolling method. On the other hand, it is extremely difficult to manufacture a steel material having a remarkably asymmetric and complicated shape, such as a rail for a linear motor car, into a shape close to a final product by a rolling method.

For this reason, a method has also been adopted in which the shape is manufactured to a certain degree of approximation by a rolling method, and the remainder is cut and removed by machining. In this case, unlike the welding build-up method described later, the inner quality is uniform, but the amount of inefficient and high-cost cutting processing is large, and the economical efficiency is extremely poor. Note that this method is also a bitter measure taken because the height of the outer guide portion and the inner guide portion cannot be sufficiently secured by the rolling method, and the dimensional accuracy cannot be secured.

The hot extrusion method is considered to be suitable for the production of shaped steel having such an asymmetrical and complicated shape. For example, Ironmaking Research Journal, No. 275, (1972), No. 3
From page 8 to page 41, a method for producing a grooved steel with protrusions is described as a shaped steel for masts of forklifts. In this method, a die suitable for the target cross-sectional shape is used, and the billet is extruded to form the shape of the product as it is.

However, the cost of the die and the lubricant is high,
Large crops, low yield, and low manufacturing efficiency. Further, when the product is thin, extrusion processing is difficult and the product length is limited. Further, complicated bending and twisting deformation are likely to occur during hot extrusion, and a large amount of correction is also a major factor in cost increase.

For the above-mentioned reasons, the conventional method for manufacturing the shaped steel having such a complicated shape is generally the built-up method (assembly method) by welding as shown in FIG. In this method, steel pieces constituting each part are collected from a rolled steel plate (sheet bar) by a method such as cutting and cutting, and assembled by welding.

However, although this weld build-up method can be said to be practical in the case of small-volume production, it requires significant cost and man-hours and is not a process suitable for mass production. In addition, it has drawbacks such as uneven texture, uneven shape, and difficulty in manufacturing long products.

[0016]

As described above, all of the conventional methods for manufacturing F-section steel, such as those used for rails for linear motor cars, are extremely labor-intensive, have low production efficiency, and have a high yield. It is also low and economically inferior.
In addition, it has performance defects such as non-uniform internal quality, a product that is not long enough to be manufactured, and large correction is required.

Therefore, there has been a demand for a method of economically and efficiently manufacturing a product having a uniform inner quality, excellent dimensional accuracy, and a sufficiently long length. And although it was thought that the rolling method was preferable, it was possible to accurately manufacture products with complicated shapes,
A manufacturing method in which a shape close to that of the final product is formed by a rolling method, and further, the deformation during cooling after rolling is small has not been completed.

[0018]

DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted repeated research aiming at establishment of a method for manufacturing F-section steel by a rolling method, which is used for rails for linear motor cars having a complicated shape as described above. Completing the present invention, by optimizing the manufacturing process, it does not require a large amount of mechanical grinding or the like after molding, and does not require large straightening after cooling.
The technology for manufacturing shaped steel was established.

The first means is a roll having a hole shape of a steel slab heated to a high temperature and having a substantially rectangular cross section in the width direction, which is pressed down in the vicinity of the central portions of the two opposite surfaces. Forming a steel material having a substantially H-shaped cross section composed of the first flange and the second flange, and rolling one side of the first flange of the steel material having the substantially H-shaped cross section by a roll having an asymmetric vertical and horizontal hole shape. It is pressed down in the vertical direction, and that part is sent to the other part to be substantially eliminated, and the remaining one side is used as the first deformed flange, and the joint between the web and the first deformed flange is the first joint. A part of the second flange,
One side extending in substantially the same direction as the first deforming flange is a second deforming flange, and one side of the second flange extending in the opposite direction of the second deforming flange is a third deforming flange. And forming a steel material having a substantially h-shaped cross section with a joint between the web and the second deformable flange and the third deformable flange as a second joint, and having the substantially h-shaped cross section. During or after forming into a steel material, the above-mentioned approximately h
Cooling the second joint of the shaped steel and its vicinity,
A method for producing a grooved steel with protrusions, in which the third deformable flange is bent in a direction substantially extending in the width direction of the web by a roll having an asymmetric hole shape in the vertical and horizontal directions to form a protrusion to form a substantially F-shape. .

The second means is a roll having a hole shape of a steel slab heated to a high temperature and having a substantially rectangular cross section in the width direction, which is pressed down in the vicinity of the central portion of the two opposite surfaces, and is provided on the web and both sides thereof. One side of the first flange of the steel material having the substantially H-shaped cross section is formed by a roll having a substantially H-shaped cross-section formed of a first flange and a second flange and having a hole shape that is vertically and horizontally asymmetrical. In the height direction, the part is sent to the other part to substantially disappear, and the remaining one side makes an angle with the web within the range of 95 to 105 °,
The first deformed flange having a substantially parallelogram cross section, the joint between the web and the second deformed flange is the first joint, and the substantially same direction as the first deformed flange of the second flange. On one side extending to the, the thickness of the joint portion with the web is thicker, the thickness of the tip portion is thinner than the joint portion, and the angle with the web is in the range of 95 to 105 °, and the cross section is substantially isosceles. With a trapezoidal second deformation flange, of the second flange,
The one side extending in the opposite direction to the second deforming flange is a third deforming flange having an approximately parallelogram-shaped cross section and having an angle of 95 to 125 ° with the web. Forming a steel material having a substantially h-shaped cross section with the deformed flange and the joint portion with the third deformable flange as a second joint portion, and / or forming into a steel material having the substantially h-shaped cross section. After forming, a direction in which the second joint portion of the substantially h-shaped steel material and its vicinity are cooled, and the third deformable flange is extended substantially in the width direction of the web by a roll having a hole shape that is vertically and horizontally asymmetrical. It is a method for manufacturing a grooved steel with protrusions which is bent into a shape to form protrusions to form a substantially F shape.

A feature of the present invention is that, as shown in the outline of the process in FIG. 1, a steel slab (15) is made up of a web (100), a first flange (101), and a second flange (102).
A rough shaped material (11) having a shaped cross section, the upper part of the first flange (101) is pressed down by a closed hole type roll, and it is substantially eliminated, and the web (200) and the first deformed flange (201). ) And their joints a first joint (204), a second deformation flange (202), a third deformation flange (203), and the web (20).
0) and a second joint (205) having a second joint (205) is formed into a substantially h-shape (including a line-symmetrical shape, a chair shape), and then a portion protruding upward (a portion of a chair back), that is, a first portion. The three deforming flanges (203) are horizontally bent projections (303) to form a substantially F-shaped steel piece.

Through these steps, the first deformable flange (201), the second deformable flange (202), and the third deformable flange (20) which are the substantially h-shaped leg portions.
The length (height) of 3) can be sufficiently secured, and the angle drop of the first joint portion (204) between the first deforming flange (201) and the web (200) can be prevented.

By the way, the F-section steel manufactured by the above process is usually air-cooled after being processed into that shape. The temperature distribution inside the steel slab is relatively uniform in the initial rolling stage, but as the process progresses, the difference due to the position becomes large due to the effects of cooling and heat generation during processing.

Of these, the former is greatly affected by the cooling method. For example, comparing the temperatures of the first joint portion (204) and the second joint portion (205), the amount of steel increases as the process proceeds. The temperature of the second joint (205), which is rich in steel, is higher than that of the first joint (204), which is low in steel.

When the steel slab having this temperature difference is cooled after the final rolling, the amount of heat shrinkage of the second joint (205) finished at a high temperature becomes large, and the first joint (204) having a low finish temperature is increased. Material bend with outer side as outer circle (camber)
Occurs. Therefore, it is necessary to keep the temperature difference between the first joint portion (204) and the second joint portion (205) at a certain value or less at the time of rolling finish, and in order to do so, the temperature difference between the first joint portion (204) and the second joint portion (205) is set to a second value in the intermediate stage of the rolling. It is necessary to perform cooling to lower the temperature of the joint portion (205).

If the cooling time is too early, the temperature difference becomes large again in the subsequent process. Based on the posture of the material being rolled and the cross-sectional dimensions, the latter half of the first intermediate rolling step or the second intermediate rolling step is preferable in the step of forming from the approximately H shape to the approximately h shape, but in the first half of the final rolling step. You can go. Of course, it may be divided into multiple times.

[0027]

EXAMPLES Examples of the present invention will be described by taking F-section steel used for rails for linear motor cars as an example.

2 and 3, the rough rolling step (K
14 to K11) are upper and lower horizontal hole type rolls (K14 to K11) of the rough rolling mill (breakdown mill: BD) 31 in FIG.
K11) is a step of shaping into a rough rolled material (11) by using a steel slab (15) produced by the continuous casting method, the ingot casting method or the slab rolling method as a raw material.

The hole type rolls (K14 to K12) are symmetrical, but the upper hole type rolls (K14U to K12U) and the lower hole type rolls (K14L to K12L) are asymmetric.
(As shown in the figure, U is attached to the upper roll and L is attached to the lower roll.)

In the rolling with the hole-type rolls (K14 to K12), in order to secure the portion to be the main girder connecting portion in the sectional view shown in FIG. 6 from the initial molding stage, the upper hole-type roll (K14U) and the upper hole-type roll (K14U) are used. The hole roll (K13U) first interrupts, and the upper hole roll (K12U) spreads out the portion that will be the main girder connection portion.

The perforated roll (K11) is an upper perforated roll (K
11U) and the lower hole type roll (K11L) are asymmetric, and each roll is also asymmetrical. It should be noted that all the hole-type rolls used in the subsequent steps are asymmetrical in the vertical and horizontal directions, like the hole-type roll (K11). By rolling the hole-shaped roll (K11), the rough shaped material (12) is formed into a roughly shaped H-shaped section (1) including a web (100), a first flange (101) and a second flange (102).
1).

The upper side of the second flange (102) is a portion which will be the main girder connecting portion (403) in a later step, and it is necessary to secure a height in rolling after the hole-shaped roll (K10). The roll holes corresponding to the portions are rib holes. Therefore, the hole type roll (K11) forms a dead hole in order to secure the amount and shape of steel.

The upper side of the first flange (101) is a counter-flange portion in the rolling steps after the intermediate rolling step (K10), and this portion disappears in the process of forming it into a substantially h-shape later, and then the second flange. Of the second flange (102) serving as the deforming flange (202) and the second deforming flange (203), and has an effect of preventing the hole-type roll (K11) from being caught. First flange (101)
The lower side is the outer guide portion (401) and the second flange (10
The upper side of 2) is the main leg connecting part (403), and the lower side is the inner guide part (402).

The rough shaped material (11) rolled into a substantially H shape in the rough rolling step is then sent to the intermediate rolling step (K10 to K5). In the intermediate rolling step, the first intermediate rolling mill (SP1) 32 and the second intermediate rolling mill (SP2) 33 shown in FIG. 3 are used. All of them are closed hole type rolls (K10
~ K5). Note that the rolling in these steps is one-pass rolling, unlike the rough rolling step.

In the intermediate rolling process, the first flange (10
The upper side of 1) is gradually rolled down to reduce the amount and height of steel in other parts. The first flange (10
The upper side of 1) also has a function of preventing the corner from falling.

The first deformed flange (201), which is molded from the underside of the first flange (101), has a parallelogram cross section which intersects the web at an angle range of 95 to 105 ° for rolling. To do. The second deforming flange (202) molded from the lower side of the second flange 102 is closer to the first deforming flange (20) than the other end of the web (200).
1) A leg extending substantially in the same direction as the lower side has a large thickness on the joint side with the web and a thin thickness on the opposite side, and the angle between the oblique line and the web is 95 to 105 °. It has a trapezoidal cross section.

The reason why the second deformable flange (203) has an isosceles trapezoidal cross section in which the angle between the oblique line and the web is 95 to 105 ° is that the third deformable flange (20) is formed in a later step.
This is because the roll can be removed even when 3) is bent.

The third deformable flange (203) is connected to the second deformable flange (202) from the second joint (205) which is the joint between the web (200) and the second deformable flange (202). It extends substantially in the opposite direction, and the angle with the web is in the range of 95 to 125 °. The third deforming flange (203) has a large upper limit of the angle formed with the web so that the bending can be easily performed when the bending is performed in a later step.

At the same time, in the intermediate rolling process (K7 to K5), the web (200) and the third deformation flange (203) are used.
An interrupt a is inserted from the inner side (upper left direction in the drawing) of the third deforming flange (203) at the boundary portion between and.

As a result, the third deformation flange (203)
In a lateral direction (to the right in the figure) to divide the web (200) which becomes the plate mounting portion (502) and the third deforming flange (203) which becomes the main girder coupling portion (503), and Prevents defective molding. Further, in this step, the web (200) is attached to the plate attaching portion (40
0), the first deformable flange (201) as the outer guide portion (401), the second deformable flange (202) as the inner guide portion (402), and the third deformable flange (20).
3) is used as the main girder connecting portion (403), and the thickness and height are substantially determined.

In the above process, the cooling process described above is inserted. Of course, cooling may be performed in the final rolling step described later, but it is difficult in terms of cooling technology due to the material attitude during rolling. The cooling method may be any of water cooling, mist cooling, and air cooling, but air cooling has a small cooling effect, and the temperature difference may not be sufficiently small in some cases.

Cooling is accomplished by the second deformation flange (202),
The third deformed flange (203) and the second joint (205) which is the joint of the web (200) can be cooled effectively. For example, the second deformation flange (20
2) and the third deformation flange (203) may be included for cooling. In this case, the second deformation flange (2
02) and the third deformed flange (203) may be temporarily lower in temperature than the first deformed flange (201), but then the temperature from the second joint (205) is reduced. Reheats due to heat.

By setting the temperature difference between the second joint portion (205) and the first joint portion (204) to be a certain value or less,
Can prevent the product from bending (camber). This critical temperature difference varies depending on the size of the product, but an example of F-section steel used for rails for linear motor cars is shown in FIG.

From this figure, in order to obtain straightness that does not require straightening after the final rolling, the bend (1 / ρ) needs to be 0.0008 or less. For that purpose, It can be seen that the upper limit of the temperature difference between the first joint portion (204) and the second joint portion (205) is 20 ° C. Therefore, for example, it indicates that the temperature difference during the intermediate rolling needs to be less than this.

It is also shown that when the bend (1 / ρ) is 0.002 or less, the product can be obtained by straightening. The critical temperature difference in this case is 40 ℃
It is. The temperature difference exceeds 40 ° C, and the bend (1 /
If ρ) exceeds 0.002, the cost of straightening becomes extremely high, and it is realistic to discard it without making it a product.

Needless to say, the above-mentioned critical temperature difference varies depending on the shape and size of the F-section steel, the rolling end temperature, etc. Further, when cooling is performed in the upstream side process, cooling is performed in the downstream side process. Obviously, it is necessary to reduce the temperature difference as compared with the case where it is performed.

On the other hand, if it is cooled too much, bending will occur and problems will occur in the subsequent rolling. The amount of bending that occurs depends on the cooling conditions and the temperature of the steel, but the second joint (2
The temperature of 05) is the temperature of the first joint (204) +5
Be sure not to drop below "° C". From this point of view, it is also preferable to perform cooling several times.

Cooling may be performed in one direction or in two or more directions as shown in FIG. By cooling from two or more directions, it is possible to effectively cool the second joint portion (205) in a state where the temperature of the flange portion is small, and as a result, the first joint portion (204) and the second joint portion (205) are cooled. The temperature difference with the second joint (205) can be reduced.

As is clear from FIG. 5, the tip of the third deforming flange (203) is connected to the second joint (20).
Although it is a considerable distance from 5), if the temperature of this portion drops too much, waviness may occur in this portion even if no bending is observed as a whole.

Therefore, this third deformation flange (2
It is necessary to prevent the temperature of (03) from remarkably decreasing. From this viewpoint, the temperature of the tip of the third deforming flange (203) at the end of the final rolling is "the temperature of the second joint (205)". It is preferable that the temperature does not fall below -20 ° C.

Similarly, if the temperatures of the first deforming flange (201) and the second deforming flange (202) drop too much, they will cause vertical bending in FIG. In this case as well, in order not to cause bending, the tips of the first deformable flange (201) and the second deformable flange (202) and the first joint portion (204) and the second joint portion (205). It is necessary to set the temperature difference between and to 20 ° C. or less.

After setting the temperature distribution as described above, finish rolling is performed. In the finish rolling step (K4 to K1), a finish rolling machine (SPF) 34 is used to perform rolling for a total of 4 passes in each 1 pass. The finish rolling rolls (K4 to K1) are all closed hole type rolls that are asymmetrical in the vertical and horizontal directions. In this step, while bending each part to a predetermined size, the third deforming flange (203) is bent to form the main girder connecting part (403).

The above rough rolling process, intermediate rolling process, and finish rolling process are examples, and the number of processes, the number of rolling mills, and the like are not limited to these. Further, it goes without saying that the cooling method is not limited to the above coolant as long as it uses a fluid.

As described above, the characteristics of the above steps are as follows. A rough shaped material having a substantially H-shaped cross section is formed, an intermediate material having a substantially h-shaped cross section is formed, and the triple points are partially cooled. The protrusions protruding above the substantially h-shape are bent to form a substantially F-shape, which is naturally applicable to the manufacture of F-section steel as shown in FIGS. 7 to 10, for example.

In FIG. 7, the first deformation flange (201) has a trapezoidal cross section. FIG. 8 shows the first flange (10
It is a shape that is left without completely removing the upper side of 1).

FIG. 9 shows a shape in which the web (300) and the flange (projection) (303) have the same wall thickness.

In FIG. 10, the flange (projection) (303) is
The shape is downward. Needless to say, specifications such as height and width of each part can be changed in a wide range.

[0058]

According to the present invention, the grooved steel with protrusions (F-shaped steel) used for the rail for the linear motor car can be precisely
It has become possible to manufacture efficiently and economically.
In addition, the production method of the present invention is superior in internal quality as compared with the conventional method, and has a large technical improvement effect. The application of the F-section steel according to the present invention is, of course,
The invention is not limited to rails for linear motor cars, but can be widely applied to F-shaped steels having the same shape.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of a rolling process of the present invention.

FIG. 2 is a diagram showing details of a rolling process of the present invention.

FIG. 3 is a schematic view of a rolling mill train used for carrying out the present invention.

FIG. 4 is a diagram showing the relationship between the temperature difference at the end of final rolling and the amount of bending after cooling to room temperature.

FIG. 5 is a schematic view showing how to apply a coolant.

FIG. 6 is a cross-sectional view in a width direction of a rail for a linear motor car, which is an object of the present invention.

FIG. 7 is a cross-sectional view of an F-section steel which is an embodiment of the present invention.

FIG. 8 is a sectional view of an F-section steel which is another embodiment of the present invention.

FIG. 9 is a sectional view of an F-section steel which is another embodiment of the present invention.

FIG. 10 is a sectional view of an F-section steel which is another embodiment of the present invention.

FIG. 11 is a schematic view of a linear motor car system using an F-section steel according to an embodiment of the present invention.

FIG. 12 is a cross-sectional view of a rail for a linear motor car manufactured by a conventional manufacturing method (welding build-up method).

[Explanation of symbols]

1-15 ... Steel materials K1 to K14 ... Rolling rolls (manufacturing process) K1U to K14U ... Rolling top rolls K1L to K14L ... Rolling bottom rolls 31 ... Coarse rolling mill (breakdown) Mill, BD) 32 ... First intermediate rolling mill (SP1) 33 ... Second intermediate rolling mill (SP2) 34 ... Finishing rolling mill (SPF) 100 ... H-shaped steel web 101 ... First flange of H-section steel 102 ... Second flange of H-section steel 200 ... Web of h-section steel 201 ... First deformation flange of h-section steel 202 ... Second deformation flange of h-section steel 203 ... Third deformation flange of h-section steel 204 ... First joint of h-section steel 205 ... Second joint of h-section steel 206. ..Coolants (water, mist, air, etc.) 300 ... F-shaped steel web 301・ ・ ・ First deformation flange of F-shaped steel 302 ・ ・ ・ Second deformation flange of F-shaped steel 303 ・ ・ ・ Protrusion of F-shaped steel 400 ・ ・ ・ Reaction plate mounting part (plate mounting part) 401 ・ ・・ Outer lateral guide portion (outer guide portion) 402 ... Main girder coupling portion 403 ... Inner lateral guide portion (inner guide portion) 501 ... Vehicle body (normal conductive magnetic levitation linear motor car) 502. ..Rail 503 ... Main girder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Etsuo Higashi Marunouchi 1-2-2, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Akio Fujibayashi 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Date Inside the Steel Pipe Corporation (72) Inventor Masahisa Fujikake 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Steel Pipe Corporation

Claims (2)

[Claims] 1. A web and a first flange on both sides of the web by a roll having a hole shape of a steel slab heated to a high temperature and having a substantially rectangular cross-section in the width direction, which is pressed down in the vicinity of the central portions of two opposite surfaces. A steel material having a substantially H-shaped cross section formed of a second flange is formed, and the substantially H-shaped section is formed by a roll having an asymmetrical hole shape.
Shaped steel material, one side of the first flange is pressed down in the height direction, and that portion is sent to the other portion to be substantially eliminated, and the remaining one side is the first deformed flange, and the web And the first joint portion of the first deformed flange and the first joint portion, the second flange, one side extending in substantially the same direction as the first deformed flange, the second deformed flange, Second flange, one side extending in the opposite direction of the second deformation flange, as a third deformation flange, the web and the second deformation flange, and the joint portion of the third deformation flange, Forming a steel material having a substantially h-shaped cross section as a second joint, and during or after molding the steel material having the substantially h-shaped cross section, the second joint portion of the substantially h-shaped steel material and A roll that cools the vicinity and has an asymmetrical hole shape More, the third deformation flanges bent in a direction substantially extending in the width direction of the web, the manufacturing method of the protrusion with interposition steel, characterized in that a substantially F-shaped to form a protrusion. 2. A web and a first flange on both sides of the web by means of a roll having a hole shape in which a steel slab heated to a high temperature and having a substantially rectangular cross-section in the width direction is pressed down in the vicinity of the central portion of the two opposite surfaces. A steel material having a substantially H-shaped cross section formed of a second flange is formed, and the substantially H-shaped section is formed by a roll having an asymmetrical hole shape.
Of one side of the first flange of the steel material having a cross section of a shape is pushed down in the height direction, the portion is sent to the other portion to be substantially eliminated, and the remaining one side forms an angle with the web of 95 to
Within the range of 105 °, a first deformed flange having a substantially parallelogram cross section is used, and a joint between the web and the second deformed flange is defined as a first joint, and the first flange of the second flange is formed. On one side extending substantially in the same direction as the one deformed flange, the thickness of the joint portion with the web is thicker, the thickness of the tip portion is thinner than the joint portion, and the angle with the web is in the range of 95 to 105 °. In the second deformed flange with a substantially isosceles trapezoidal cross section,
An angle between the second flange and one side of the second flange extending in the opposite direction to the second deformed flange with the web is 95 to 125.
The third deformed flange having a substantially parallelogram cross section in the range of °, and the joint between the web, the second deformed flange, and the third deformed flange was used as the second joint. Forming a steel material having a substantially h-shaped cross section, and cooling the second joint portion of the substantially h-shaped steel material and its vicinity during or after forming into a steel material having the substantially h-shaped cross section, A grooved steel with protrusions, characterized in that the third deformable flange is bent in a direction substantially extending in the width direction of the web by a roll having a left-right asymmetrical hole shape to form a protrusion to form a substantially F shape. Manufacturing method.