JP5369706B2 - T-shaped steel manufacturing equipment and manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide equipment and a method for manufacturing a T-shaped steel by hot-rolling, in which both inside and outer corners of the tip end of a flange of a T-shaped steel are rounded. <P>SOLUTION: In the equipment 1 for manufacturing the T-shaped steel by hot-rolling, an edger mill 5 has upper and lower horizontal grooved rolls 51a, 51b, which are provided with at least arc-shaped inside corner parts 55 for rolling down the inside corners of the tip ends of a flange 22. In the front or the rear of a finishing mill 6, there are provided upper and lower rollers 7, 7, which have small diameter parts 72 to be brought into contact with the front end faces of the flange 22 and have side wall parts 74 to be brought into contact with the outer faces of the flange 22, and in which corner parts 75 formed between the small diameter parts 72 and the side wall parts 74 are made arc-shaped. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a manufacturing facility and a manufacturing method for T-shaped steel by hot rolling.

FIG. 11 shows the cross-sectional shape of the T-section steel. The T-section steel 20 is a section steel having a T-shaped cross section composed of a web 21 and a flange 22 and is widely used in the fields of shipbuilding, bridges, etc., and has various dimensions depending on the application, use conditions, use location, etc. The product is manufactured.
Commonly used dimensions of the T-shaped steel 20 are as follows: web height: about 200-1000 mm, web thickness: about 8-25 mm, internal web dimension: about 190-980 mm, flange width: about 80-400 mm, flange thickness: 12 About 40 mm. Furthermore, in the case of the T-section steel 20 used for shipbuilding, the web height is often twice or more the flange width.

  The T-shaped steel 20 for shipbuilding or the like is often painted for the purpose of rust prevention. When the tip shape of the flange 22 of the T-shaped steel 20 or the shape of the portion where the flange 22 and the web 21 intersect is a right angle, there is a problem that the paint becomes thin at the corner portion and the coating is easily peeled off. Therefore, R (roundness) is formed at the tip of the flange 22 of the T-shaped steel 20 or at the corner of the portion where the flange 22 and the web 21 intersect in order to improve paint adhesion and prevent peeling. It is desirable. Here, R must be formed on the inner side and the outer side of the front end of the flange 22, and the radii are not only the same, but also different radii R1, R2 as shown in FIG. There is a case.

  The T-shaped steel 20 is generally manufactured by welding a web 21 and a flange 22. However, in that case, since the steel plate used for the flange 22 has four corners having right angles, it is necessary to give R (roundness) to the corners of the tip by some method in the application for coating. On the other hand, when the T-section steel 20 is integrally formed by rolling, it is considered that there is a possibility that R can be formed at the tip of the flange 22 during rolling.

As an example of the technology for manufacturing the T-section steel 20 by rolling, in order to efficiently manufacture T-section steel having various dimensions of web thickness, flange thickness, web height and flange width, a universal rolling mill is used as an intermediate rolling process. There has been proposed a hot rolling facility in which one unit is disposed in the finish rolling process (see, for example, Patent Document 1). FIG. 13 shows an example of hot rolling equipment.
The hot rolling equipment 101 includes a rough shaping rolling mill 102 that reciprocally rolls a raw steel piece carried out of a heating furnace (not shown) to roughly form a cross-section with a substantially T-shaped section, and the rough shaping rolling mill 102 substantially Intermediate rolling mill group 103 for forming a T-shaped steel piece roughly formed into a T-shape (see FIG. 12) into a T-shaped steel having a substantially product size, and a T-shaped steel formed into a substantially product size as a product size. A finishing universal rolling mill 106 for forming is provided. The intermediate rolling mill group 103 includes a rough universal rolling mill 104 and an edger rolling mill 105 installed downstream of the rough universal rolling mill 104.

  The rolling process by the rough shaping rolling mill 102 is a rough shaping rolling process, and the configuration of the rough shaping rolling mill 102 is schematically shown in FIG. The rough shaping rolling mill 102 includes an upper roll 102a and a lower roll 102b in which three sets of perforations are formed. Then, the rough shaping rolling mill 102 sequentially rolls the material steel slabs with these hole molds to obtain a material to be rolled (T-shaped steel slab) H composed of the web 21 and the flange 22 shown in FIG. .

  Moreover, the rolling process by the rough universal rolling mill 104 and the edger rolling mill 105 constituting the intermediate rolling mill group 103 is an intermediate rolling process. FIG. 14B shows the configuration of the rough universal rolling mill 104, and FIG. 1 schematically shows the configuration of the edger mill 105. The rough universal rolling mill 104 includes a pair of horizontal rolls 141a and 141b and a pair of trough rolls 142a and 142b as shown in FIG. As shown in FIG. 14C, the edger rolling mill 105 has a pair of horizontal rolls 151a and 151b each having a large diameter roll part 153 and a small diameter roll part 154. The material to be rolled (T-shaped slab) H obtained in the rough shaping rolling process is a rough universal rolling mill 104 and an edger rolling mill 105 that constitute an intermediate rolling mill group 103 installed on the downstream side of the rough shaping rolling mill 102. Thus, the thickness of the web 21 and the flange 22 is reduced, and the material to be rolled (T-shaped steel having a substantially product size) H in which the flange width of the flange 22 is adjusted. At this time, various web thicknesses can be adjusted without changing the roll by adjusting the roll opening degree of the horizontal rolls 141a and 141b, and various by adjusting the roll opening degree of the pair of saddle rolls 142a and 142b. The flange thickness can be adjusted. Furthermore, the flange width can be adjusted by adjusting the interval between the small diameter portions 154 of the pair of horizontal rolls 151a and 151b.

  Furthermore, the rolling process by the finishing universal rolling mill 106 is a finishing rolling process, and the configuration of the finishing universal rolling mill is schematically shown in FIG. As shown in FIG. 14D, the finishing universal rolling mill 106 includes a pair of horizontal rolls 161a and 161b and a pair of trough rolls 162a and 162b. And the to-be-rolled material H obtained by the intermediate rolling process becomes the product cross-sectional shape by the flange 22 standing upright by the finishing universal rolling mill 106.

  On the other hand, as a technique for forming R at the tip corner of the flange of the section steel having the flange, for example, there is a method and equipment for forming R at the tip corner of the flange of the H-section steel disclosed in Patent Document 2. . In this technique, as shown in FIG. 15, a raw steel slab is roughly rolled into a roughly H-shaped rough shaped material H <b> 1 by a rough shaping rolling mill 201, followed by intermediate rolling comprising a rough universal rolling mill 203 and an edger rolling mill 204. In the manufacturing method of H-section steel, which is formed into an intermediate rolled material H2 having a predetermined web thickness, flange thickness, and flange width by the machine group 202, and then finish-rolled by the finish universal rolling mill 205, as a roll of the edger rolling mill 204, FIG. As shown in FIG. 4, the inner corner at the tip of the flange 22 is formed in an arc shape by using the upper roll 204a and the lower roll 204b each having a hole shape in which the corner that compresses the inner corner at the tip of the flange 22 has a predetermined arc shape. 15 and 17 is provided between the intermediate rolling mill group 202 and the finishing universal rolling mill 205, and the upper rolls 206a, 06a and lower roll 206 b, to obtain an intermediate rolled material H3 forming an outer angle portion of the tip of the flange 22 in a circular arc shape by the rolling mill 206 having a 206 b.

  Further, in Patent Document 3, as a method of forming R at the outer corner of the flange end of the I-shaped steel, forming rollers 301, 302, 303, 304 as shown in FIG. 18 are provided on the entrance side of the finishing universal rolling mill. The technology to arrange is known.

Japanese Patent Publication No. 43-19671 Japanese Patent No. 4016818 JP 2002-301501 A

However, as a result of investigations by the present inventors, it has been found that there is the following problem when trying to form R at the corner of the flange tip of the T-shaped steel using the above-described conventional technique.
That is, in the technique described in Patent Document 2 (see FIG. 15), the R of the inner corner of the tip of the H-shaped steel flange is applied by the upper roll 204a and the lower roll 204b of the edger rolling mill 204. (Refer to FIG. 16). It is considered that the technique of imparting R to the inner corner of the flange tip is also applicable to T-section steel.

  However, the technique applied by the rolling mill 206 having the upper rolls 206a, 206a and the lower rolls 206b, 206b having variable hole widths shown in FIG. It turned out to be difficult.

  The H-shaped steel has a symmetric cross-sectional shape and has flanges on the left and right. Therefore, when the outer corner of the tip of the flange is squeezed with the hole type shown in FIG. Can be rolled. On the other hand, in the case of T-shaped steel, since it has an asymmetrical cross-sectional shape, there is a roll that restrains the opposite side when the outer corner of the flange tip is squeezed with the hole type shown in FIG. In other words, the material to be rolled escapes and it is difficult to form R by properly rolling down the outer corner of the tip of the flange. The flange of the material to be rolled to be rolled by the edger rolling machine is rolled in a state inclined about 3 ° to 10 ° outward, and when this is done, the outer corner of the tip of the flange is rolled down in the horizontal direction. A force for pressing the rolled material is inevitably generated, and the material to be rolled escapes in the horizontal direction opposite to the flange. This problem similarly occurs even when the forming rollers 301, 302, 303, and 304 (see FIG. 18) disclosed in Patent Document 3 are applied to rolling of T-shaped steel.

  Therefore, the present invention has been made to solve the above-described problems, and the object thereof is to provide a hot that can form R at both the inner corner and the outer corner of the tip of the flange of the T-shaped steel. An object of the present invention is to provide a production facility and a production method for T-shaped steel by rolling.

In order to achieve the above object, a T-shaped steel manufacturing facility according to claim 1 of the present invention is a rough shaping rolling mill for roughly rolling a material steel piece into a material to be rolled comprising a web having a substantially T-shaped cross section and a flange. A rough universal rolling mill and an edger for rolling the material to be rolled comprising a web and a flange having a substantially product size, and a web having a substantially T-shaped cross section and a flange roughly rolled by the rough shaping rolling mill. An intermediate rolling mill group composed of rolling mills, and a finish rolling mill that finish-rolls the material to be rolled, which has been rolled to a substantially product size by the intermediate rolling mill group, into a T-shaped steel including a web and a flange having a product dimension. In a manufacturing facility for T-shaped steel by hot rolling, the edger rolling machine includes upper and lower horizontal rolls each having a hole mold having at least an arc-shaped inner corner that compresses the inner corner at the tip of the flange. In addition, the front or rear surface of the finishing mill has a small-diameter portion that contacts the front end surface of the flange and a side wall portion that contacts the outer surface of the flange, and a corner portion between the small-diameter portion and the side wall portion. Is formed in an arc shape, and upper and lower rollers having an angle between the small diameter portion and the side wall portion of 90 ° to 110 ° are provided.

Moreover, the T-section steel manufacturing facility according to claim 2 of the present invention is the T-section steel manufacturing facility according to claim 1, wherein the upper and lower rollers are within 5 m forward or within 5 m rearward of the finishing mill. It is characterized by being installed in .

Moreover, the T-section steel manufacturing facility according to claim 3 of the present invention is the T-section steel manufacturing facility according to claim 1 or 2 , wherein the upper and lower rollers are provided behind the finish rolling mill, The small diameter portions of the upper and lower rollers are horizontally installed.

Moreover, the manufacturing method of the T-shaped steel which concerns on Claim 4 among this invention is a rough shaping | molding rolling process of rough-rolling a raw material piece to the to-be-rolled material which consists of a web and a flange of a substantially T-shaped cross section with a rough shaping rolling mill, The material to be rolled comprising a web and a flange having a substantially T-shaped cross-section that has been roughly rolled by the rough shaping rolling process comprises a web and a flange having a substantially product size by an intermediate rolling mill group comprising a rough universal rolling mill and an edger rolling mill. An intermediate rolling process for rolling to a material to be rolled, and a finish rolling process for finishing and rolling the material to be rolled, which has been rolled to a substantially product size by the intermediate rolling process, to a T-shaped steel comprising a web and a flange having a product size. In the method of manufacturing a T-section steel by hot rolling, the intermediate rolling step has fewer arc-shaped inner corners that squeeze the inner corners of the front ends of the flanges. In the hole mold of the edger rolling mill having upper and lower horizontal rolls having a hole mold, the material to be rolled is rolled to form an inner corner of the tip of the flange into an R shape, and the finish rolling step Then, the corner between the small diameter portion and the side wall portion is provided on the front surface or the rear surface of the finish rolling mill, and has a small diameter portion that contacts the front end surface of the flange and a side wall portion that contacts the outer surface of the flange. The upper and lower rollers having a circular arc shape and an angle between the small diameter portion and the side wall portion of 90 ° to 110 ° are used to roll the material to be rolled, and the outer corner at the tip of the flange is rounded It is characterized by being molded into

According to the T-section steel manufacturing facility according to claim 1 and the T-section manufacturing method according to claim 4 of the present invention, in the intermediate rolling step, the arc-shaped inner side that compresses the inner corner of the tip of the flange. In the hole mold of the edger rolling mill having upper and lower horizontal rolls having a hole mold having at least a corner, the material to be rolled is rolled to form the inner corner of the tip of the flange into an R shape, and in the finish rolling step, Provided on the front or rear surface of the finishing mill, and has a small diameter portion that contacts the front end surface of the flange and a side wall portion that contacts the outer surface of the flange, and the corner portion between the small diameter portion and the side wall portion has an arc shape With the upper and lower rollers, the material to be rolled is rolled and the outer corner of the tip of the flange is formed into an R shape. For this reason, the manufacturing equipment and manufacturing method of the T-shaped steel by hot rolling which can form R in both the inner corner | angular part and outer corner | angular part of the front-end | tip of the flange of T-shaped steel can be provided.

Moreover, according to the T-section steel manufacturing facility according to claim 2 of the present invention, in the T-section steel manufacturing facility according to claim 1, the upper and lower rollers are within 5 m forward or rearward of the finish rolling mill. Since it is installed within 5 m, R can be reliably formed at the outer corner of the tip of the flange.
Furthermore, according to the manufacturing facility of T-shaped steel according to claim 1 of the present invention, since the angle between the small-diameter portion and the side wall portion of the front Stories upper and lower rollers is at 90 ° to 110 °, rolled There is no possibility that the corners of the large-diameter part and the side wall part come into contact with the outer surface of the flange of the T-shaped steel and cause wrinkles. Can be formed.

Moreover, according to the T-section steel manufacturing facility according to claim 3 of the present invention, in the T-section steel manufacturing facility according to claim 1 or 2 , the upper and lower rollers are provided behind the finishing mill. Since the small-diameter portions of the upper and lower rollers are installed horizontally, the front end surface of the flange can be squeezed horizontally, and the material to be rolled can be moved to the outer corner of the front end of the flange without moving laterally. R can be reliably formed.

It is a schematic block diagram of embodiment of the manufacturing equipment of the T-section steel which concerns on this invention. It is a schematic diagram for demonstrating the rough universal rolling mill used for the manufacturing equipment of the T-section steel shown in FIG. It is a schematic diagram for demonstrating the edger rolling machine used for the manufacturing equipment of the T-section steel shown in FIG. FIG. 4 is an enlarged view of a portion indicated by an arrow 4 in FIG. 3. It is a schematic diagram for demonstrating the finishing mill used for the manufacturing equipment of the T-section steel shown in FIG. It is a schematic diagram for demonstrating the upper and lower rollers used for the manufacturing equipment of the T-section steel shown in FIG. It is a schematic diagram which shows the detail of the shape of the upper and lower rollers shown in FIG. It is a schematic diagram which shows the modification of an up-and-down roller. It is a schematic diagram for demonstrating an up-and-down roller at the time of installing an up-and-down roller in the front surface of a finishing mill. It is a schematic diagram which shows the detail of the shape of the upper and lower rollers shown in FIG. It is sectional drawing of T-section steel. It is sectional drawing of the T-shaped steel piece of a substantially T-shaped cross section. It is a schematic block diagram which shows an example of the manufacturing equipment of the conventional T-section steel. (A) is a schematic diagram for explaining a rough shaping rolling mill used in a conventional T-shaped steel manufacturing facility, and (B) is for explaining a rough universal rolling mill used in a conventional T-shaped steel manufacturing facility. (C) is a schematic diagram for explaining an edger rolling machine used in a conventional T-shaped steel manufacturing facility, and (D) is a finishing universal rolling mill used in a conventional T-shaped steel manufacturing facility. It is a schematic diagram for demonstrating. It is a schematic block diagram which shows an example of the manufacturing equipment of the conventional flange tip R attached H-section steel. It is a figure which shows the method of providing R to the inner corner | angular part of a flange front-end | tip in the edger rolling mill of the manufacturing equipment of the H-section steel with flange front-end | tip R in FIG. It is a figure which shows the method to provide R to the outer corner | angular part of a flange front-end | tip in the hole-type variable rolling mill of the manufacturing equipment of the H-section steel with a flange front end R in FIG. It is a figure which shows the technique which provides R to the outside corner | angular part of the conventional I-shaped steel flange front-end | tip.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an embodiment of a T-section steel manufacturing facility according to the present invention.
The T-section steel manufacturing facility 1 shown in FIG. 1 sequentially arranges the rough shaping rolling mill 2, the intermediate rolling mill group 3, and the finishing rolling mill 6 from the upstream side to the downstream side, that is, from the front side to the rear side. Set up. Further, on the rear surface of the finishing mill 6, upper and lower rollers 7 and 7 (only the lower roller 7 is shown in FIG. 1) for forming an R at the outer corner of the flange tip are installed.

  The rough shaping rolling mill 2 reciprocally rolls a material to be rolled (raw steel slab, not shown) conveyed on a table roller (not shown) from a heating furnace (not shown), and has a substantially T-shaped cross section. Then, rough rolling is performed on the material to be rolled (T-shaped steel slab, see FIG. 12) H (rough modeling rolling process). As the rough shaping rolling mill 2, known equipment can be used, for example, a double rolling mill equipped with a roll having a hole shape.

The intermediate rolling mill group 3 is installed downstream of the rough shaping rolling mill 2 in the rolling direction. The intermediate rolling mill group 3 is substantially formed of a material to be rolled H composed of a web 21 and a flange 22 that are roughly rolled in the rough shaping rolling mill 2. The material is rolled into a material to be rolled (see a broken line in FIG. 3) H composed of a web 21 and a flange 22 (intermediate rolling process).
In this embodiment, the intermediate rolling mill group 3 includes a rough universal rolling mill 4 shown in FIG. 2 and an edger rolling mill 5 shown in FIG. Yes.

Here, as shown in FIG. 2, the rough universal rolling mill 4 has a pair of upper and lower horizontal rolls 41a and 41b that rotate on a horizontal axis, and a pair of left and right rolls 42a and 42b that rotate on a vertical axis. doing. The pair of upper and lower horizontal rolls 41a and 41b and the pair of left and right heel rolls 42a and 42b are arranged to face each other.
In the rough universal rolling mill 4, the entire surface in the height direction of the web 21 of the material to be rolled H is pressed down in the plate thickness direction by the horizontal rolls 41 a and 41 b, and the flange 22 is formed on the side surfaces of the roll roll 42 a and the horizontal rolls 41 a and 41 b. Roll down in the thickness direction.

The thickness of the web 21 is adjusted by adjusting the opening of the horizontal rolls 41a and 41b, and the thickness of the flange 22 is adjusted by adjusting the opening of the flange roll 42a and the side surfaces of the horizontal rolls 41a and 41b.
Further, as shown in FIG. 3, the edger rolling mill 5 has upper and lower horizontal rolls 51 a and 51 b provided with a large-diameter roll portion 53 and a small-diameter roll portion 52 in the horizontal axis direction. The large-diameter roll portion 53 guides the web 21 of the material to be rolled H, and the roll surface 52a of the small-diameter roll portion 52 presses down the front end surface of the flange 22 in the width direction. A side wall portion 54 is provided between the roll surface 52 a of the small diameter roll portion 52 and the roll surface of the large diameter roll portion 53. This side wall part 54 is in contact with the inner surface of the flange 22 of the material to be rolled H to be rolled, and plays a role of guiding the material to be rolled H. As shown in FIG. 4, the corner between the side wall portion 54 and the roll surface 52 a of the small-diameter roll portion 52 is an arc-shaped inner corner portion 55 that reduces the inner corner portion at the tip of the flange 22. . The arc radius R1E of the inner corner 55 is the same or slightly larger than the arc radius R1 of the inner corner of the tip of the flange 22 of the T-shaped steel 20 that is the product. This is because the arc radius may be slightly smaller when the flange 22 is lightly reduced by the finish rolling mill 6 after the intermediate rolling process, and the arc radius R1E is 0 to 30% larger than R1. It is preferable to do this. The arc radius R1E is generally 2 mm or more. This is because the arc radius required at the tip of the flange 22 of the T-shaped steel used for painting purposes is 2 mm or more. In addition, since the upper limit of the arc radius at the tip of the flange 22 is up to ½ of the flange thickness, the arc radius R1E of the inner corner 55 at the tip of the flange 22 may be less than or equal to ½ of the flange thickness. What is necessary is as follows.

  In the intermediate rolling process, reciprocal rolling is performed by the rough universal rolling mill 4 and the edger rolling mill 5, and the material to be rolled H is rolled to a predetermined dimension in a plurality of passes. Here, in the intermediate rolling step, the hole shape of the edger rolling mill 5 having upper and lower horizontal rolls 51a and 51b each having an arcuate inner corner portion 55 that squeezes the inner corner portion of the tip of the flange 22 is provided. Then, the material to be rolled H is rolled and the inner corner of the tip of the flange 22 is formed into an R shape. However, the outer corner of the tip of the flange 22 of the material to be rolled H is a corner where R is not formed.

The finish rolling mill 6 is installed behind the intermediate rolling mill group 3, and the rolled material H rolled to a substantially product size by the intermediate rolling mill group 3 is a T-shaped steel made up of a product-size web 21 and a flange 22. 20 is finish-rolled (finish rolling step).
The finish rolling mill 6 is composed of a finish universal rolling mill. As shown in FIG. 5, a pair of upper and lower horizontal rolls 61a and 61b that rotate on a horizontal axis and a pair of left and right rolls that rotate on a vertical axis. 62a and 62b. The side surfaces of the horizontal rolls 61a and 61b are orthogonal to the roll surface.

  When the flange 22 of the material H to be rolled is lightly rolled by the roll 62a, the flange 22 is formed perpendicular to the web 21. The horizontal rolls 61a and 61b can be prevented from moving in the axial direction by pressing the heel roll 62b against the side faces of the horizontal rolls 61a and 61b on the side not facing the flange 22.

  In the finish rolling mill 6, the web 21 is hardly reduced or is lightly reduced to the extent that the shape and dimensions are adjusted. The finish rolling mill 6 and the rough universal rolling mill 4 are generally different in the shape of the flange roll on the flange 22 side. That is, in the rough universal rolling mill 4, it is often the shape of a mountain that is centered in the height direction of the roll 42 a and is inclined 3 ° to 5 ° from the vertical. On the other hand, in the finishing mill 6, the outer peripheral surface of the reed roll 62a is substantially vertical, the outer periphery of the reed roll 62a is flat, and the roll diameter is the same. The number of passes of finish rolling is generally one pass, and the material to be rolled H is rolled while moving in one direction from the upstream to the downstream of the rolling line.

  And the to-be-rolled material H which rolling by the finishing mill 6 was complete | finished gives R to the outer corner | angular part of the front-end | tip of the flange 22 by the up-and-down roller 7 installed in the back of the finishing mill 6, and has product cross-sectional shape. Become. FIG. 6 shows the configuration of the upper and lower rollers 7, and FIG. 7 shows the details of the shapes of the upper and lower rollers. As shown in FIG. 6, each of the upper and lower rollers 7, 7 is positioned between a small diameter portion 72 that contacts the distal end surface of the flange 22, a large diameter portion 73, and between the small diameter portion 72 and the large diameter portion 73. In addition, a side wall 74 that contacts the outer surface of the flange 22 is provided. And the corner | angular part 75 between the small diameter part 72 and the side wall part 74 is formed in the predetermined circular arc shape. By rolling down the outer corner of the tip of the flange 22 of the material to be rolled H with the corner 75 formed in this arc shape, R is formed at the outer corner of the tip of the flange 22.

  Each of the upper and lower rollers 7 and 7 is assumed to produce T-shaped steel 20 having various flange thicknesses, and a position adjusting mechanism (not shown) that can move in the lateral direction (direction perpendicular to the rolling direction). have. This position adjustment mechanism moves each of the upper and lower rollers 7 and 7 to the large-diameter portion 73 side when rolling a product with a thick flange, and when rolling a product with a thin flange thickness, Each of the rollers 7 and 7 is moved to the small-diameter portion 72 side so that the position of the arc-shaped corner 75 is aligned with the outer corner of the end of the flange 22 of the material H to be rolled after the finish rolling mill 6 has finished rolling. To. Each of the upper and lower rollers 7 and 7 has a position adjusting mechanism (not shown) that can move in the vertical direction on the assumption that the T-section steel 20 having various flange widths is manufactured. In the case of rolling a product with a narrow flange width, this position adjusting mechanism moves each of the upper and lower rollers 7 and 7 so that the interval between them is narrow, and when rolling a product with a wide flange width, Each of the upper and lower rollers 7 and 7 is moved so that the distance between them is increased, and the position thereof is adjusted to a height at which the outer peripheral surface of the roll of the small diameter portion 72 is in contact with the front end surface of the flange 22 of the material H to be rolled.

  The arc radius R2R of the corner portion 75 between the small diameter portion 72 and the side wall portion 74 is usually the same as the arc radius R2 of the outer corner portion of the tip of the flange 22 of the target product, and is generally 2 mm or more. This is because the arc radius required at the tip of the flange 22 of the T-shaped steel 20 used for painting purposes is 2 mm or more. Further, since the upper limit of the arc radius at the tip of the flange 22 is up to ½ of the flange thickness, the arc radius R2R of the outer corner portion 75 at the tip of the flange 22 may be less than or equal to ½ of the flange thickness. What is necessary is as follows.

  As shown in FIG. 7, each of the upper and lower rollers 7 and 7 (only the upper roller is shown in FIG. 7) is installed so that its rotation axis is horizontal in a direction orthogonal to the rolling direction. The outer peripheral surface of the small diameter portion 72 has the same roll diameter in the width direction (direction orthogonal to the rolling direction), and the surface that contacts the tip surface of the flange 22 is also held horizontally. For this reason, the front end surface of the flange 22 can be crushed horizontally.

  And the side wall part 54 following the small diameter part 72 inclines so that the angle which the small diameter part 72 makes may be in the range of 90 degrees-110 degrees. If the angle is smaller than 90 °, the corners of the large-diameter portion 73 and the side wall portion 74 may come into contact with the outer surface of the flange 22 of the rolled T-section steel 20 and are not preferable. On the other hand, when the angle is larger than 110 °, it becomes difficult to attach R to the outer corner of the tip of the flange 22 of the rolled T-shaped steel 20 and the product shape is deteriorated.

  The distance from the finishing mill 6 on which the upper and lower rollers 7 and 7 are installed is preferably within 5 m behind the finishing mill 6. This is to form R at the outer corner of the tip of the flange 22 in a state where the material to be rolled H rolled by the horizontal rolls 61a and 61b and the rolls 62a and 62b of the finishing mill 6 is constrained. . When the positions of the upper and lower rollers 7 and 7 are separated from the finish rolling mill 6 by 5 m or more, there is a possibility that the position of the material H to be rolled moves in the lateral direction (direction perpendicular to the rolling direction). The rolled material H immediately after exiting the finishing mill 6 has the web 21 in a horizontal posture, but the tip of the web 21 descends toward the roller table as the web 21 moves away from the finished rolling mill 6, and the rolled material. Since H assumes an oblique posture, it becomes difficult to roll down the outer corners of the tip of the flange 22 with the corners 75 of the upper and lower rolls 7 and 7. Therefore, it is preferable to install the upper and lower rolls 7 and 7 as close to the rolling roll exit side of the finishing mill 6 as possible.

  However, the material to be rolled H after being rolled by the finish rolling mill 6 has the flange 22 formed vertically, so that the lower end of the outer peripheral surface of the small-diameter portion 72 (the material to be rolled) like the upper and lower rollers 7 and 7 of this embodiment. When the material H is in contact with the tip end surface of the flange 22 and the roll axis is sandwiched from above and below by a roller with a horizontal roll axis, the material to be rolled H is applied in the transverse direction (perpendicular to the rolling direction) on the tip side of the web 21. The pushing force is not generated. Therefore, if a guide roller or the like that keeps the position and posture of the material to be rolled H appropriately is installed, it can be installed farther than 5 m behind the finishing mill 6.

  It is preferable that the upper and lower rollers 7 and 7 are placed in contact with the front end surface of the flange 22 or at a position where the flange 22 is lightly reduced at a reduction rate of 1% or less from above and below. Further, as shown in FIG. 8, the width of the small diameter portion 72 of the upper and lower rollers 7 and 7 may be smaller than the width of the front end surface of the flange 22. There may be parts that do not contact. In this case, it is preferable that the corner of the small diameter portion 72 opposite to the side wall portion 74 has an arc shape of 2 mm or more so that there is no step at the tip of the flange 22.

  Furthermore, as another method of forming R at the outer corner of the front end of the flange 22, a small diameter portion 72 that contacts the front end surface of the flange 22 and a side wall portion 74 that contacts the outer surface of the flange 22 on the front surface of the finish rolling mill 6. And upper and lower rollers 7 and 7 having a corner 75 between the small diameter portion 72 and the side wall portion 74 in an arc shape. In this case, since the flange 22 of the material to be rolled H is inclined outward on the front surface of the finish rolling mill 6, the upper and lower rollers 7 and 7 have a rotating shaft with a flange 22 as shown in FIG. Install the projector in a state that is inclined with respect to the horizontal direction according to the inclination. Here, it is preferable that the surface where the small diameter portion 72 is in contact with the front end surface of the flange 22 is perpendicular to the inclined flange 22. The angle formed by the small-diameter portion 72 and the side wall portion 74 is in the range of 90 ° to 110 °, similarly to the case where the upper and lower rollers 7 are installed on the rear surface of the finishing mill 6. Further, the arc radius R2R ′ of the corner portion 75 between the small diameter portion 72 and the side wall portion 74 shown in FIG. 10 is set to the same or slightly larger value than the arc radius R2 of the outer corner portion of the front end of the flange 22 of the product. This is because the arc radius may be slightly reduced when the flange 22 is lightly rolled by the finishing mill 6 after being rolled down by the upper and lower rollers 7, 7. The arc radius R2R ′ of the corner 75 between the small diameter portion 72 and the side wall portion 74 is preferably a radius that is 0 to 30% larger than R2. The arc radius R2R ′ is generally 2 mm or more. This is because the arc radius required for the tip of the flange of the T-shaped steel used for painting purposes is 2 mm or more. Further, since the upper limit of the arc radius at the tip of the flange 22 is up to ½ of the flange thickness, the arc radius R2R ′ of the corner portion 75 may also be ½ or less of the flange thickness, and generally 15 mm or less. . The width of the small diameter portion 72 may be smaller than the flange thickness of the material to be rolled H.

  Thus, when the upper and lower rollers 7 and 7 are installed on the front surface of the finish rolling mill 6, the material to be rolled H moves in the lateral direction (direction perpendicular to the rolling direction) and the outer corner of the end of the flange 22. In order to prevent R from being formed in the part, it is preferable to install as close as possible to the finishing mill 6, and it is preferable to install within 5 m from the finishing mill 6. Further, the upper and lower rollers 7 and 7 are similar to the case where they are installed on the rear surface of the finishing mill 6 in order to cope with the rolling of T-shaped steels having different flange thicknesses and flange widths. A position adjustment mechanism is provided for moving the frame horizontally and vertically.

  As described above, according to the present embodiment, in the intermediate rolling process, the upper and lower horizontal rows 51a including at least the hole molds having the arc-shaped inner corners 55 that compress the inner corners of the tips of the flanges 22; In the hole mold of the edger rolling mill 5 having 51b, the material to be rolled H is rolled to form the inner corner of the tip of the flange 22 into an R shape, and is provided on the front surface or the rear surface of the finishing mill 6 in the finish rolling process. The upper and lower rollers having a small-diameter portion 72 in contact with the front end surface of the flange 22 and a side wall portion 74 in contact with the outer surface of the flange 22 and having a corner 75 between the small-diameter portion 72 and the side wall portion 74 in an arc shape. 7 and 7, the material H to be rolled is rolled and the outer corner of the tip of the flange 22 is formed into an R shape. For this reason, the manufacturing equipment and manufacturing method of the T-shaped steel by hot rolling which can form R in both the inner corner | angular part and outer corner | angular part of the front-end | tip of the flange of T-shaped steel can be provided.

  It should be noted that the upper and lower rollers 7 and 7 may be driven or not driven when installed on either the front surface or the rear surface of the finishing mill 6. However, in order to bring the upper and lower rollers 7 and 7 as close as possible to the finishing mill 6, it is necessary to make the structures of the upper and lower rollers 7 and 7 as simple as possible to make a small device, so normally no drive is preferable. Even if the upper and lower rollers 7 and 7 are not driven, if the rolls 7 and 7 are installed close to the finishing mill 6, the material to be rolled H is moved up and down by the driving force of the rolling mill and the inertia force of the material H to be rolled. It can pass between the rollers 7 and 7 without any problem.

As mentioned above, although embodiment of this invention has been described, this invention is not limited to this, A various change and improvement can be performed.
For example, the intermediate rolling mill group 3 includes one coarse universal rolling mill 4 and one edger rolling mill 5, but the rolling mill configuration of the intermediate rolling mill group 3 is not limited to this, and the rough universal rolling mill 4 or Two or more edger rolling mills 5 may be used. The present invention can also be applied to continuous rolling in which a plurality of rough universal rolling mills 4 and edger rolling mills 5 are unidirectionally rolled with finishing mill 6.

As an example, from a bloom having a rectangular cross section with a thickness of 250 mm and a width of 310 mm, a web height of 300 mm, a flange width of 100 mm, a web thickness of 9 mm, and a flange thickness of 16 mm were obtained using the T-shaped steel manufacturing facility 1 shown in FIG. A T-shaped steel having a target dimension was rolled.
As the rough rolling mill 2, a double rolling mill having upper and lower rolls provided with a plurality of perforations was used.

  As the rough universal rolling mill 4 constituting the intermediate rolling mill group, the one having the structure shown in FIG. 2 was used. As the horizontal rolls 41a and 41b, those having an angle from the vertical direction of the side surface (an angle formed by a vertical direction line and the side surfaces of the horizontal rolls 41a and 41b) of 7 ° were used. The left and right scissors rolls 42a and 42b are arranged so as to face each other and have a vertically symmetrical mountain shape having a hypotenuse inclined at an angle of 7 ° from the vertical, with the center in the width direction of the roll surface as a vertex in the cross-sectional shape. In addition, among the left and right scissors rolls 42a and 42b, those that press the side surfaces of the horizontal rolls 41a and 41b are adjusted so that the horizontal rolls 41a and 41b do not move in the horizontal axis direction by rolling the flange 22. .

As the edger rolling mill 5, the one shown in FIG. 3 was used. The inclination angle of the step portion was set to 7 ° from the vertical, and the arc radius R1E of the inner corner portion 55 that squeezed the inner corner portion of the tip of the flange 22 was 4 mm.
As the finishing mill 6, a finishing universal rolling mill having a structure shown in FIG. 5 was used.
Upper and lower rollers 7 and 7 having the same structure as that shown in FIGS. 6 and 7 were installed at a position 1 m from the axial center of the rear surface of the finishing mill 6. The horizontal positions and intervals of the upper and lower rollers 7 and 7 are such that the small-diameter portion 52 and the side wall are on a line extending from the position of the outer corner at the tip of the flange 22 of the material H to be rolled by the finish rolling mill 6 in the rolling direction. The adjustment was made so that the corner 75 of the part 52 came. The arc radius R2R of the corner 75 is 3 mm.

In the manufacture of the T-shaped steel, the bloom first heated in the heating furnace was rolled by the rough shaping rolling mill 2 to obtain a T-shaped steel piece having a substantially T-shaped cross section as shown in FIG. The obtained T-shaped billet had a web thickness of 40 mm, a flange thickness of 75 mm, a web height of 375 mm, and a flange width of 130 mm.
Subsequently, the intermediate universal rolling mill 4 in which the rough universal rolling mill 4 and the edger rolling mill 5 are arranged close to each other in this order from the upstream side to the downstream side performs five-pass reciprocating rolling. The thickness of the flange 22 was reduced, the width of the flange 22 was reduced by the edger rolling mill 5, and the inner corners of the tip of the flange 22 were each formed into an R shape.

Next, the finishing mill 6 rolled one pass, and the inclination of the flange 22 was shaped vertically. The web 21 and the flange 22 were lightly pressed.
Finally, the upper and lower rollers 7 and 7 installed on the rear surface of the finish rolling mill 6 formed R at the outer corner of the tip of the flange 22 to finish rolling.
At the corner of the tip of the flange 22 of the rolled T-shaped steel 20 as described above, an R of 3.1 mm on the outside and 3.3 mm on the inside is formed. Could be granted.

  Thus, if the T-shaped steel manufacturing equipment and manufacturing method of the present invention are used, it becomes possible to manufacture a large number of flange-shaped R-shaped T-shaped steels suitable for the application to be painted in large quantities at low cost. .

DESCRIPTION OF SYMBOLS 1 Production equipment of T-shaped steel 2 Rough shaping rolling mill 3 Intermediate rolling mill group 4 Coarse universal rolling mill 5 Edger rolling mill 6 Finish rolling mill (finishing universal rolling mill)
7 Upper and lower rollers 20 T-shape steel 21 Web 22 Flange 41a, 41b Horizontal roll 42a, 42b Roller roll 51a, 51b Horizontal roll 52 Small diameter roll part 52a Roll surface 53 Large diameter roll part 54 Side wall part 55 Inner corner part 61a, 61b Horizontal Roll 62a, 62b Roller roll 72 Small diameter portion 73 Large diameter portion 74 Side wall portion 75 Corner portion 101 T-shape steel manufacturing equipment 102 Rough shaping rolling mill 102a Upper roll 102b Lower roll 103 Intermediate rolling mill group 104 Rough universal rolling mill 141a, 141b Horizontal roll 142a, 142b Roll roll 105 Edger rolling mill 151a, 151b Horizontal roll 153 Large diameter roll section 154 Small diameter roll section 106 Finish universal rolling mill 161a, 161b Horizontal roll 162a, 162b Roll roll 201 Rough modeling rolling Machine 202 Intermediate rolling mill group 203 Rough universal rolling mill 204 Edger rolling mill 204a, 204b Roll 205 Finish universal rolling mill 206a, 206b Roll 301, 302, 303, 304 Forming roller H Rolled material

Claims (4)

A rough shaping rolling machine for roughly rolling a material steel piece into a material to be rolled comprising a web and a flange having a substantially T-shaped cross section, and the rolled material comprising a substantially T-shaped web and a flange roughly rolled by the rough shaping rolling mill An intermediate rolling mill group consisting of a rough universal rolling mill and an edger rolling mill for rolling a material into a rolled material consisting of a web and a flange having a substantially product size, and the workpiece rolled to a substantially product size by the intermediate rolling mill group. In a T-shaped steel manufacturing facility by hot rolling equipped with a finish rolling mill that finish-rolls rolled material into a T-shaped steel consisting of a web and flange of product dimensions,
The edger rolling mill has upper and lower horizontal rolls provided with a hole mold having at least arc-shaped inner corners for rolling down the inner corners of the flange tips,
The finish rolling mill has a small-diameter portion that contacts the front end surface of the flange and a side wall portion that contacts the outer surface of the flange on the front or rear surface, and a corner between the small-diameter portion and the side wall portion is circular. A T-shaped steel manufacturing facility, characterized in that it has a shape and is provided with upper and lower rollers having an angle of 90 ° to 110 ° formed by the small diameter portion and the side wall portion .   The T-section steel manufacturing facility according to claim 1, wherein the upper and lower rollers are installed within 5 m forward or 5 m backward of the finishing mill. The said upper and lower rollers are provided in the back of the said finishing mill, The said small diameter part of the said upper and lower rollers is installed horizontally, The manufacturing equipment of T-section steel of Claim 1 or 2 characterized by the above-mentioned. A rough shaping rolling step of roughly rolling a raw steel piece into a material to be rolled consisting of a web and a flange having a substantially T-shaped cross section by a rough shaping rolling mill, and a web and a flange having a substantially T-shaped cross-section roughly rolled by the rough shaping rolling step An intermediate rolling process in which the material to be rolled is rolled into a material to be rolled consisting of a web and a flange having a substantially product size by a group of intermediate rolling machines composed of a rough universal rolling mill and an edger rolling mill, and a substantially product size obtained by the intermediate rolling process. In a method for producing a T-section steel by hot rolling, comprising a finish rolling step of finish-rolling the material to be rolled into a T-section steel consisting of a product-sized web and a flange by a finish rolling mill,
In the intermediate rolling step, in the hole mold of the edger rolling mill having upper and lower horizontal rolls provided with a hole mold having at least an arc-shaped inner corner portion for rolling down the inner corner portion of the tip of the flange, Rolling the material and forming the inner corner of the flange tip into an R shape,
In the finish rolling step, the finish rolling mill is provided on the front surface or the rear surface of the finish rolling mill, and includes a small diameter portion that contacts the front end surface of the flange and a side wall portion that contacts the outer surface of the flange, and the small diameter portion and the side wall portion The upper corner of the flange is formed by rolling the material to be rolled with upper and lower rollers having an arc shape between the corners and an angle between the small diameter portion and the side wall portion of 90 ° to 110 °. A method for producing a T-shaped steel, wherein the part is formed into an R shape.

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