JP4992040B2 - T-section steel rolling method and rolling equipment - Google Patents

Description

  The present invention relates to a rolling method and rolling equipment for T-shaped steel using a rolling tool for H-shaped steel, and more particularly to a rolling method and rolling equipment for T-shaped steel with easy web height adjustment and good web tip shape.

  As shown in FIG. 1, a T-section steel is a section steel in which a web portion 11 and a flange portion 12 are integrally formed, and is widely used in fields such as shipbuilding and bridges, and products of various sizes are required.

  Patent Document 1 relates to a method for rolling a T-shaped steel, and describes a method for efficiently producing a T-shaped steel that requires various dimensions (web thickness, flange thickness, web height, and flange thickness).

  The invention described in Patent Document 1 manufactures a T-section steel using the equipment for rolling the H-section steel shown in FIG. 7, and uses a roughly universal T-shaped rough slab as a rough universal rolling mill 2 in an intermediate rolling process. T-section steel is produced by rolling with the edger rolling mill 4 and the finishing universal rolling mill 5.

  It is possible to roll products with various flange thicknesses and web thicknesses by adjusting the opening degree of the horizontal roll and the saddle roll of the finishing universal rolling mill 5.

Patent Document 2 describes a method of manufacturing a T-shaped steel using a dedicated rolling facility. In the invention described in Patent Document 2, the thickness of the web and the flange is rolled by an exclusive rolling mill having three rolls, the leading end of the flange is rolled by a vertical roll rolling mill, and the leading end of the web is rolled by an edger rolling mill having a number of perforations. To do.
Japanese Patent Publication No. 43-19671 Japanese Patent Laid-Open No. 50-17356

  However, in the rolling method of the T-section steel described in Patent Document 1, a universal rolling mill is used in both the intermediate rolling process and the finishing rolling process, the web thickness is adjusted by the universal rolling mill, and the flange thickness is adjusted. Further, the end of the flange is formed by being reduced by an edger rolling mill installed near the downstream of the rough universal rolling mill, but the hot end of the end of the web is terminated without being reduced by a roll in the web height direction.

  For this reason, in many cases, the web height is not always equal to the target dimension, and the tip of the web has an arc shape when viewed in the longitudinal section of the product, which is not preferable as a product.

  Therefore, after hot rolling, the tip of the web may be cut and shipped as a product by gas cutting or slitting, etc., but if it is made a product after the hot rolling through a cutting process, the manufacturing cost of the T-shaped steel Lead to an increase in delivery and delays in delivery.

  In addition, although a method has been described in which a cutting portion is provided in a horizontal roll of a finishing universal rolling mill and a web tip is cut and shaped in a finishing rolling process, since the sagging or rounding occurs in the cutting portion in this method, the shape of the web tip As a result, the product having a good cross-sectional shape cannot be obtained.

  In the method described in Patent Document 2, the use of a special three-roll rolling mill increases the equipment cost. Also, in order to prevent buckling when edging the web, it is necessary to provide a large number of hole types in the edger rolling mill, set the hole type that matches the web dimensions by rapidly shifting in the direction perpendicular to the pass line, The equipment costs are further increased due to the shift device.

  Further, when the web is thinned, the width of the hole mold must be narrowed. In particular, when the web height is large, there is a high possibility that the rolled material does not enter the hole mold well and a rolling defect is caused.

  The present invention has been made to solve such problems, and is a method for rolling a T-shaped steel, which allows a web height dimension to be set as a target by hot rolling and can shape the web tip into a good shape. The purpose is to provide inexpensive rolling equipment.

The object of the present invention can be achieved by the following means.
1. A roller provided between a rough universal rolling mill and an edger rolling mill when a T-shaped steel slab roughly formed into a T shape in a rough rolling process is rolled using a rough universal rolling mill and an edger rolling mill in an intermediate rolling process. The rolling method of T-section steel rolled into a product shape by rolling using a finishing universal rolling mill in a finishing universal rolling process after rolling with a coarse universal rolling mill and an edger rolling mill while reducing the web tip.
2. In a T-shaped steel rolling facility having a rough universal rolling mill, an intermediate rolling mill group, and a finishing universal rolling mill, the intermediate rolling mill group is a roller that rolls down the web tip between the rough universal rolling mill and the edger rolling mill. A rolling facility for T-section steel, comprising at least one rolling mill group having

  According to the present invention, while maintaining the hot rolling, the height of the web becomes the target, and the shape of the web tip is improved, so that it is not necessary to cut the web tip after the hot rolling. As a result, the manufacturing cost of the T-shaped steel can be reduced, and delays in delivery can be prevented.

  Moreover, it is possible to manufacture a T-shaped steel with an equipment configuration in which a roller is added to a general H-shaped steel rolling equipment, and equipment costs can be reduced.

  The T-section steel rolling facility according to the present invention uses the H-section steel rolling facility shown in FIG. 7, and a roller for reducing the web tip is provided between the rough universal rolling mill and the edger rolling mill. It is characterized by that. Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 2 shows an example of a T-section steel rolling facility according to the present invention. In the figure, 1 is a rough shaping rolling mill, 2 is a rough universal rolling mill, 3 is a roller, 4 is an edger rolling mill, and 5 is a finishing universal rolling mill.

  The rough shaping rolling mill 1 is a double rolling mill equipped with a roll having a hole shape, and rolls a raw steel piece from a heating furnace into a T-shaped steel piece having a substantially T-shaped cross section.

  The intermediate rolling equipment is a rolling equipment in which the rough universal rolling mill 2 and the edger rolling mill 4 are installed. The coarse universal rolling mill 2 reduces the thickness of the web and the flange, and the edger rolling mill 4 reduces the flange tip to flange. Control the width.

  In the present invention, the roller 3 for reducing the tip of the web 11 is installed between the rough universal rolling mill 2 and the edger rolling mill 4. In the intermediate rolling process, reciprocating rolling using these rolling mills and rollers 3 is performed.

  FIG. 3 schematically shows the rolling situation of the T-section steel by the rough universal rolling mill 2, and the thickness of the web 11 is reduced by the horizontal roll 21, and the thickness of the flange 12 is reduced by the side surface of the horizontal roll 21 and the side roll 22. To do.

  In order to suppress the thrust force acting in the axial direction of the horizontal roll 21 by reducing the flange 12, the saddle roll 23 facing the saddle roll 22 is preferably rolled while being pressed against the side surface of the horizontal roll 21.

  FIG. 4 is a schematic view showing a state in which the tip of the T-shaped steel web 11 is crushed by rollers 31 and 32 installed between the rough universal rolling mill 2 and the edger rolling mill 4. A roller having a flat outer periphery is used so that the tip of the web 11 can be crushed flat regardless of the web thickness.

  The roller 32 on the flange side has an inclination that decreases in diameter toward the upper and lower ends of the roller in accordance with the inclination of the flange 12. The roller 32 is a restraint for preventing the position of the rolled material from shifting due to the rolling force at the tip of the web 11, and does not roll down the flange 12.

  Although it is possible to reduce the tip of the web 11 without the roller 32 on the flange side, it is preferable to provide the roller 32 in order to roll the web height with high accuracy. The rollers 31 and 32 may be driven, but are installed between the two rolling mills, the rough universal rolling mill 2 and the edger rolling mill 4, which obstructs the passage of the rolled material even if it is not driven. In other words, a non-driving roller that freely rotates is sufficient from the viewpoint of simplifying the equipment.

  However, in order to adjust the amount of reduction at the tip of the web 11, the position can be adjusted in the horizontal direction perpendicular to the rolling direction.

  FIG. 5 is a diagram schematically showing rolling of the T-shaped steel by the edger rolling machine 4, and both ends of the flange 12 are crushed. The horizontal roll 41 of the edger rolling machine 4 is rolled with a slight gap between the web 11 and the horizontal roll 41 so that only the tip of the flange 12 is crushed and the web 11 is not crushed. In the intermediate rolling process, it is desirable to roll the flange 12 with an inclination angle θ of about 5 to 10 °.

  FIG. 6 is a diagram schematically showing the rolling of the T-section steel by the finishing universal rolling mill 5, and the rolled material rolled to the target web thickness, flange thickness, web height and flange width in the intermediate rolling process is as follows. The flange 12 is vertically shaped by the horizontal roll 51 and the saddle rolls 52 and 53 to become a product.

  In the present invention, the rollers 31 and 32 for rolling down the tip of the web 11 are installed between two adjacent rolling mills, the rough universal rolling mill 2 and the edger rolling mill 4, for the following reason. State.

  As the web 11 becomes thinner and the height dimension of the T-shaped steel becomes larger, the web 11 may buckle when the tip of the web 11 is rolled down, and a desired amount of reduction cannot be obtained, or the cross-sectional shape of the T-shaped steel may deteriorate. Increases sex.

  The rolling mills used in the intermediate rolling mill group of the present invention are the rough universal rolling mill 2 and the edger rolling mill 4, and each rolling mill rolls with the web 11 sandwiched between horizontal rolls.

  For this reason, even if it rolls down the front-end | tip of the web 11 with the roller 31 between two adjacent rolling mills, the rough universal rolling mill 2 and the edger rolling mill 4, the front and back of the material to be rolled are Since the web 11 is almost fixed by being caught in the edger rolling mill 4, the web 11 is unlikely to buckle.

  It is possible to efficiently roll with a smaller number of passes by increasing the number of rolling mills, and when many rolling mills are arranged, the intermediate rolling is completed in one pass, and reciprocating rolling becomes unnecessary, The rolling efficiency is dramatically improved.

  Therefore, in the present invention, the intermediate rolling equipment includes at least one rough universal rolling mill 2 and an edger rolling mill 4, and a rolling mill group including rollers 31 and 32 for reducing the web tip between them.

  The arrangement of rolling mills in the intermediate rolling facility is, for example, from the upstream to the downstream, rough universal rolling mill 2, rollers 31, 32, edger rolling mill 4, rough universal rolling mill 2, rollers 31, 32, edger rolling mill 4. .

  When rolling T-shaped steel with the rolling equipment according to the present invention, first, T-shaped steel pieces roughly formed into a T-shape in the rough rolling process are used in the intermediate rolling process using a rough universal rolling mill and an edger rolling mill. Roll.

  At that time, the web tip is crushed by a roller provided between the rough universal rolling mill and the edger rolling mill, and subsequently the finished universal rolling process is used to obtain a product shape in the finishing universal rolling process.

  A section rolling mill shown in FIGS. 2 and 7 for a T-shaped steel having a target dimension of 300 mm web height, 100 mm flange width, 9 mm web thickness, and 16 mm flange thickness from a bloom having a rectangular cross section with a thickness of 250 mm and a width of 310 mm. It was manufactured using. FIG. 2 shows an example of the present invention, and FIG. 7 shows a comparative example in which one rough universal rolling mill 2 and one edger rolling mill 4 are provided.

  First, in any shape rolling equipment, rolling was performed with a double rolling mill 1 incorporating a hole roll to roll a T-shaped steel piece having a substantially T-shaped cross section. The web thickness of the T-shaped billet was 40 mm, and the flange thickness was 75 mm.

  When the shape steel rolling facility shown in FIG. 2 is used, a 5-pass reciprocating rolling is performed by an intermediate rolling mill group in which a web tip reduction roller 3 is arranged between the rough universal rolling mill 2 and the edger rolling mill 4, and the web And squeezed the flange.

  Finally, a finishing universal rolling mill 5 having a horizontal roll and a saddle roll was used to perform one-pass rolling in which the inclination of the flange was vertically shaped to obtain a T-shaped steel having a target size (Example of the present invention).

  On the other hand, when the shape steel rolling equipment shown in FIG. 7 in which the web tip reduction roller is not used is used, the web tip cannot be reduced, so the web height is larger than the target of 300 mm and is about 306 mm. A dimension error occurred.

  The web height increased as the leading and trailing ends of the rolled material, and the dimensions were not constant. Manufacturing costs increased because the web tip was cut.

The schematic diagram explaining T-section steel. Example of the present invention. The figure which shows typically the rolling condition of the T-section steel by a rough universal rolling mill. The schematic diagram which shows a mode that the web front-end | tip of T-shaped steel is crushed with a roller. The figure which shows typically the rolling situation of the T section steel with the edger rolling mill The figure which shows typically the rolling condition of the T-section steel by a finishing universal rolling mill. The figure explaining the rolling equipment of H-section steel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coarse shaping rolling machine 2 Coarse universal rolling mill 3 Roller 4 Edger rolling mill 5 Finishing universal rolling mill 11 Web 12 Flange 31, 32 Roller 41, 51 Horizontal roll 52, 53 竪 roll

Claims (2)

  A roller provided between a rough universal rolling mill and an edger rolling mill when a T-shaped steel slab roughly formed into a T shape in a rough rolling process is rolled using a rough universal rolling mill and an edger rolling mill in an intermediate rolling process. The rolling method of T-section steel rolled into a product shape by rolling using a finishing universal rolling mill in a finishing universal rolling process after rolling with a coarse universal rolling mill and an edger rolling mill while reducing the web tip.   In a T-section steel rolling facility having a rough universal rolling mill, an intermediate rolling mill group, and a finishing universal rolling mill, the intermediate rolling mill group is a roller that rolls down the web tip between the rough universal rolling mill and the edger rolling mill. A rolling facility for T-section steel, comprising at least one rolling mill group having

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