WO2013114909A1 - Manufacturing device and manufacturing method for unequal leg and unequal thickness angle steel - Google Patents

Description

Manufacturing apparatus and manufacturing method for unequal sides and unequal thickness irons

The present invention relates to a manufacturing apparatus and a manufacturing method of unequal sides and unequal thick angle steel.

Unequal side unequal thickness angle steel is a steel material having an asymmetrical shape in the length and thickness of the long side and the short side, and is often used as a stiffener inside a ship. . Such an unequal side unequal thickness angle steel has an asymmetric shape in the vertical and horizontal directions, and is difficult to manufacture stably. In general, unequal side unequal thick angle steel is manufactured using a perforated rolling method (see Patent Document 1). That is, the unequal side unequal thickness angle steel is obtained by performing reciprocal rolling of a plurality of passes on a steel material having a rectangular cross section using a rough rolling mill having a hole shape in a rough rolling step. A rough shaped steel slab having a long side is manufactured, and (2) in the intermediate rolling process, the rough shaped steel slab is subjected to reciprocal rolling of a plurality of passes using an intermediate rolling mill having a hole shape, and (3) a finish rolling process. The steel slab is subjected to finish rolling using a finish rolling mill having a hole mold.

JP-A-60-102201

There are the following problems when manufacturing unequal side unequal thick angle steel using the perforated rolling method. That is, the cross-sectional shape of the hole shape used in the layout of the rolling line shown in FIG. 1 is asymmetric both vertically and horizontally as shown in FIG. For this reason, if rolling is performed without any induction guide, the product will bend up and down and left and right on the entry side and exit side of the rolling mill during rolling, causing a shape defect and the hole shape of the next process. It is difficult to guide and bite the product.

Furthermore, there is another problem as shown below in the method of manufacturing the unequal side unequal thick angle steel using the hole rolling method. Hereinafter, with reference to FIG. 9, the problem of the manufacturing method of an unequal side unequal thickness angle steel using a hole rolling method is demonstrated. FIG. 9 is a plan view of a steel slab for explaining the problems of the method of manufacturing an unequal side unequal thick angle steel utilizing the hole rolling method. Since the unequal side unequal thickness angle steel has an asymmetrical shape up and down and left and right, as in the steel slab 100a shown in FIG. 9, it is bent in the left and right direction (± Y direction in the figure) immediately after rolling in the intermediate and finish rolling steps. May occur. The code | symbol L in FIG. 9 has shown the center position of the rolling roll. *

When the left and right direction bending occurs in the steel piece, it is difficult to stably guide the steel piece to the next hole shape and bite it. From such a background, in the conventional method for manufacturing unequal side unequal thick angle steel, as shown in FIG. By restricting, like the steel piece 100b shown in FIG. 9, it was suppressed that the bending of the left-right direction generate | occur | produces immediately after rolling.

However, when the lateral movement of the steel slab is restricted by installing the side guides 101a and 101b, the downward movement (Z-direction in the figure) is restricted by the transport roller or the like, so that the upward direction ( The force to lift in the (+ Z direction in the figure) acts on the steel piece, and the steel piece is twisted. When the steel piece is twisted, it is difficult to stably guide the steel piece to the next hole shape and bite it in the same manner as when the horizontal bending occurs. For this reason, provision of the manufacturing apparatus and manufacturing method of the unequal-side unequal thick angle steel which can suppress that a bending and a twist generate | occur | produce in a steel piece was anticipated.

This invention is made | formed in view of the said subject, The objective provides the manufacturing apparatus and manufacturing method of an unequal side inequality thick angle steel which can suppress that a bending and a twist generate | occur | produce in a steel piece. There is.

An apparatus for producing an unequal side unequal thick angle steel according to the present invention includes a rolling mill having a perforation, and produces an unequal side unequal thickness angle steel by passing a steel piece through the rolling mill. A manufacturing apparatus for thick steel, which is provided on the exit side of the rolling mill, and is provided on the exit side of the rolling mill, a first member that regulates the lateral movement of the steel slab rolled by the rolling mill. And a second member that regulates the upward movement of the steel slab by contacting the upper surface of the steel slab rolled by the rolling mill.

The apparatus for producing an unequal side unequal thickness angle steel according to the present invention is characterized in that, in the above invention, the second member is disposed at a position in contact with the peak of the unequal side unequal thickness angle steel. And

The apparatus for producing an unequal side unequal thickness chevron according to the present invention is characterized in that, in the above invention, the second member is disposed at a position in contact with a long side portion of the unequal side unequal thickness chevron. To do.

In the above invention, the manufacturing apparatus for unequal side unequal thick angle steel according to the present invention is characterized in that the second member is configured to be movable in the vertical direction.

An apparatus for producing unequal side unequal thick angle steel according to the present invention is the above-mentioned invention, wherein the steel slab is brought into contact with a lower surface of a steel slab rolled by the rolling mill provided on the outlet side of the rolling mill. It is characterized by including the 3rd member which regulates the downward motion.

In the above invention, the manufacturing apparatus for unequal-sided unequal thick angle steel according to the present invention comprises a plurality of hole molds, and the first member and the second member are provided on the outlet side of each hole mold, The arrangement position of the members is different among a plurality of hole types.

A method for producing an unequal side unequal thick angle steel according to the present invention is a method for producing an unequal side unequal thickness angle steel by passing a steel piece through a rolling mill having a hole mold. The first member provided on the exit side of the rolling mill regulates the left-right movement of the steel slab rolled by the rolling mill, and the first member provided on the exit side of the rolling mill. And restricting the upward movement of the steel slab rolled by the rolling mill by two members.

According to the manufacturing apparatus and the manufacturing method of the unequal side unequal thick angle steel according to the present invention, it is possible to suppress the bending and twisting of the steel piece.

FIG. 1 is a diagram showing a configuration of a rolling line of unequal side unequal thick angle steel to which the present invention is applied. FIG. 2 is a diagram showing a configuration of a rolling line of unequal side unequal thick angle steel to which the present invention is applied. FIG. 3 is a cross-sectional view showing a configuration of an unequal side unequal thick angle steel which is an embodiment of the present invention. FIG. 4 is a schematic diagram showing the configuration of a hole mold used in the manufacture of unequal side unequal thick angle steel. FIG. 5 is a front view showing a configuration of a rolling mill exit-side guide that is an embodiment of the present invention. FIG. 6 is a view of a rolling mill exit guide according to an embodiment of the present invention as viewed from the exit of the rolling mill. FIG. 7 is a view showing a configuration of a modified example of the rolling mill outlet guide shown in FIG. FIG. 8 is a view showing a configuration of another modified example of the rolling mill outlet guide shown in FIG. FIG. 9 is a plan view of a steel slab for explaining the problems of the method of manufacturing an unequal side unequal thick angle steel utilizing the hole rolling method.

Hereinafter, with reference to the drawings, a manufacturing apparatus and a manufacturing method of unequal side unequal thick angle steel which is an embodiment of the present invention will be described.

[Composition of rolling line]
First, with reference to FIG. 1, the structure of the rolling line of the unequal side unequal thickness angle steel to which this invention is applied is demonstrated.

FIG. 1 is a diagram showing a configuration of a rolling line of unequal side unequal thick angle steel to which the present invention is applied. As shown in FIG. 1, the rolling line of unequal side unequal thickness angle steel to which the present invention is applied is a reverse type that produces unequal side unequal thickness angle steel by performing multiple passes of reciprocating rolling on a steel slab. The rolling line. That is, a rolling line 1 shown in FIG. 1 includes a heating furnace 2 that uniformly heats a steel slab having a rectangular cross section, and a breakdown mill (BD) that rolls the steel slab into a rough steel slab having a short side and a long side. 3), a transport mechanism 4 for transporting the rough steel slab to the intermediate rolling mill 5, and by performing reciprocating rolling of a plurality of passes, the rough steel slab is only partially convex on the long side of the rectangle. Intermediate rolling mills 5 and 6 (R1 mill, S1 mill) for rolling into a flat shape, and finish rolling mill (SF mill) 7 for rolling a steel slab into a product shape by finish rolling with a hole mold having a product shape, I have.

However, the rolling line of the unequal side unequal thickness angle steel to which the present invention is applied is not limited to the reverse type rolling line shown in FIG. 1, and is also applied to the tandem type rolling line as shown in FIG. can do. That is, the rolling line 1 shown in FIG. 2 is provided with a plurality of finishing mills 8a to 8j (F mill group) having hole shapes different in shape, and finishes a plurality of steel slabs without reciprocating the steel slabs. The steel slab is rolled into a product shape by sequentially inserting it into the rolling mills 8a to 8j.

[Composition of unequal sides and unequal thickness irons]
Next, with reference to FIG. 3, the structure of the unequal side unequal thickness angle steel which is one Embodiment of this invention is demonstrated.

FIG. 3 is a cross-sectional view showing a configuration of an unequal side unequal thick angle steel which is an embodiment of the present invention. As shown in FIG. 3, an unequal side unequal thick angle steel 10 according to an embodiment of the present invention has a long side part (web) 10a and a short side part (flange) 10b. Further, the length A of the long side portion 10a is longer than the length B of the short side portion 10b, and the thickness t1 of the long side portion 10a is thinner than the thickness t2 of the short side portion 10b. The unequal-side unequal thickness chevron 10 is rolled in an asymmetrical chevron shape as shown in FIG. 3, but may be rolled in an L-shape.

[Hole type configuration]
Next, with reference to FIG. 4, the structure of the hole type | mold used for manufacture of an unequal side unequal thickness angle steel is demonstrated.

FIG. 4 is a schematic diagram showing the configuration of a hole mold used in the manufacture of unequal side unequal thick angle steel. As shown in FIGS. 4 (a) to 4 (h), a plurality of perforations having different shapes are used in the production of unequal side unequal thick angle steel, and these perforations are used in the intermediate rolling mill shown in FIG. 5 and 6 and the finishing mill 7 or the finishing mills 8a to 8j shown in FIG. The unequal side unequal thickness angle steel is manufactured by rolling the steel slabs into a product shape in stages by sequentially inserting the steel slabs into a plurality of perforations using a reverse mill or a tandem mill.

[Configuration of rolling mill exit guide]
In the manufacturing apparatus and manufacturing method of unequal side unequal thick angle steel which is an embodiment of the present invention, in order to suppress the occurrence of bending and twisting in the steel slab, the rolling mill exit side guide is as shown below. It is composed. Hereinafter, with reference to FIG. 5 thru | or FIG. 8, the structure of the rolling mill delivery side guide which is one Embodiment of this invention is demonstrated.

FIG. 5 is a front view showing a configuration of a rolling mill exit guide according to an embodiment of the present invention. FIG. 6 is a view of a rolling mill exit guide according to an embodiment of the present invention as viewed from the exit of the rolling mill. FIG. 7 is a view showing a configuration of a modified example of the rolling mill outlet guide shown in FIG. FIG. 8 is a view showing a configuration of another modified example of the rolling mill outlet guide shown in FIG. Hereinafter, the rolling (insertion) direction of the steel slab is expressed as the X direction, the direction orthogonal to the X direction in the horizontal plane is expressed as the Y direction, and the vertical direction orthogonal to the X direction and the Y direction is expressed as the Z direction.

The rolling mill delivery-side guide according to an embodiment of the present invention is provided with the exits of the intermediate rolling mills 5 and 6 and the finishing rolling mill 7 shown in FIG. 1 or the finishing rolling mills 8a to 8j shown in FIG. On the side. As shown in FIGS. 5 and 6, the rolling mill exit side guide 20 includes side guides 21 and 22, side rollers 23 and 24, an upper stripper 25, a lower stripper 26, and a pressing roller 27. ing. However, in FIG. 5, illustration of the side guide 22 and the side roller 24 is omitted. Moreover, the code | symbol 31 in FIG. 5 represents the table roller in the reverse type rolling line, and represents the intermediate trough in the tandem type rolling line. The side guides 21 and 22 and the side rollers 23 and 24 function as a first member according to the present invention. The pressing roller 27 functions as a second member according to the present invention.

The side guides 21 and 22 are provided on both the left and right sides of the unequal side unequal thickness iron 10. The side rollers 23 and 24 are provided on the side guides 21 and 22, respectively. The side rollers 23 and 24 are configured to be movable in the ± Y direction using an actuator so that the peripheral surfaces can protrude toward the unequal side unequal thickness iron 10 from the end surfaces of the side guides 21 and 22. The side rollers 23 and 24 may be controlled to move online or offline, or may be moved during rolling. The side guides 21 and 22 and the side rollers 23 and 24 bend in the ± Y direction to the unequal side unequal thickness angle steel 10 immediately after rolling by restricting the movement of the unequal side unequal thickness angle steel 10 in the ± Y direction. Is suppressed from occurring.

The upper stripper 25 and the lower stripper 26 are disposed close to the upper roll 30a and the lower roll 30b, respectively. The upper stripper 25 and the lower stripper 26 are respectively inserted into the upper roll 30a, the lower roll 30b, and the steel pieces by inserting tip portions protruding toward the peripheral surfaces of the upper roll 30a and the lower roll 30b. It suppresses that a steel piece winds around the roll 30a and the lower roll 30b. Concave portions 25a and convex portions 26b are formed on the lower surface of the upper stopper 25 and the upper surface of the lower stripper 26, respectively, in accordance with the hole shape. The unequal side unequal thickness angle steel 10 rolled by the intermediate rolling mill and the finish rolling mill is in the space S formed by the peripheral surfaces of the side rollers 23 and 24, the lower surface of the upper stopper 25, and the upper surface of the lower stripper 26. Pass through.

The pressing roller 27 has a drum shape. The pressing roller 27 is disposed at a position downstream of the upper stopper 25 in the rolling direction, and the circumferential surface thereof is in contact with the peak 10 c of the chevron of the unequal side unequal thickness iron 10. The pressing roller 27 is configured to be movable in the ± Z direction by using an actuator so that the circumferential surface can always contact the mountain-shaped apex 10 c of the unequal side unequal thickness angle steel 10. The pressing roller 27 may be controlled to move online or offline, or may be moved during rolling.

In the rolling mill outlet guide 20 having such a configuration, the movement of the unequal side unequal thick angle steel 10 in the ± Y direction is regulated by the side guides 21 and 22 and the side rollers 23 and 24. In addition, the movement in the −Z direction of the unequal side unequal thick angle steel 10 generated by regulating the movement in the ± Y direction is regulated by the table roller (or intermediate trough) 31 or the like. The movement in the + Z direction of the unequal side unequal thickness iron 10 generated by regulating the movement in the ± Y direction is regulated by the pressing roller 27.

For this reason, according to the rolling mill exit-side guide 20 according to an embodiment of the present invention, the occurrence of bending or twisting in the unequal side unequal thick angle steel 10 immediately after rolling is suppressed, and the unequal side unequal thickness chevron. The steel 10 can be stably guided and bitten to the next hole type. In addition, when the rolling mill outlet guide 20 is installed on the outlet side of the final rolling mill, product defects due to bending or twisting can be reduced, and subsequent press processing can be reduced and yield can be improved. Further, since the positions of the peripheral surfaces of the side rollers 23 and 24 and the pressing roller 27 are movable, the shape of the hole shape, that is, the rolling mill in which the rolling mill outlet guide 20 is arranged, and the magnitude of bending and twisting. In accordance with this change, the unequal side unequal thick angle steel 10 can be stably guided and bitten to the next hole shape.

In the present embodiment, no roller is disposed on the lower stripper 26 side, but as shown in FIG. 7, the lower stripper 26 is located at the downstream side in the rolling direction, and the circumferential surface has unequal sides and unequal thicknesses. You may arrange | position the roller 28 in the position which contacts the lower surface 10d of the steel 10. FIG. By disposing the roller 28 at a position where the peripheral surface contacts the lower surface 10d of the unequal side unequal thickness iron 10, the lower surface 10d of the unequal side unequal thickness iron 10 is strong against the table roller (or intermediate trough) 31 and the like. It can suppress that shape defects, such as image sticking and abrasion, generate | occur | produce by contacting.

Moreover, in this embodiment, although the pressing roller 27 was arrange | positioned in the position where a surrounding surface contacts the peak-shaped vertex 10c of the unequal-sided unequal thickness angle steel 10, the present invention is not limited to this embodiment. As long as it is a place where bending or twisting occurs, it may be disposed opposite to a place other than the mountain-shaped apex 10 c of the unequal side unequal thick angle steel 10. Specifically, as shown in FIG. 8, the pressing roller 29 may be disposed at a position where the peripheral surface contacts the long side portion 10 a of the unequal side unequal thickness iron 10. However, in this case, the shape of the pressing roller 29 is a cylindrical shape in accordance with the hole shape. Further, the pressing roller 29 is configured to be movable in the ± Z direction using an actuator so that the circumferential surface can always come into contact with the long side portion 10a of the unequal side unequal thickness iron 10. By arranging the rollers so as to face each other only where bending or twisting occurs, the design of the rolling mill exit-side guide 20 can be facilitated, and maintenance work such as bearings provided on the rollers can be reduced. it can.

As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the description and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on the present embodiment are all included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Rolling line 2 Heating furnace 3 Breakdown mill 4 Conveying mechanism 5,6 Intermediate rolling mill 7,8a-8j Finishing rolling mill 10 Unequal side inequality thick angle steel 10a Long side part 10b Short side part 10c Vertex 10d Lower surface 20 Rolling mill Exit guide 21, 22 Side guide 23, 24 Side roller 25 Upper stripper 26 Lower stripper 27, 29 Pressing roller 28 Roller 30a Upper roll 30b Lower roll 31 Table roller (or intermediate trough)

Claims (7)

An apparatus for producing unequal side unequal thickness chevron for producing unequal side unequal thickness chevron by passing a steel slab through the rolling mill,
A first member that is provided on the exit side of the rolling mill and regulates the movement in the left-right direction of the steel slab rolled by the rolling mill;
A second member that is provided on the exit side of the rolling mill and that regulates the upward movement of the steel slab by contacting the upper surface of the steel slab rolled by the rolling mill;
An apparatus for producing unequal sides and unequal thickness irons. 2. The apparatus for manufacturing an unequal side unequal thickness chevron according to claim 1, wherein the second member is disposed at a position in contact with a peak of an unequal side unequal thickness chevron. The apparatus for manufacturing an unequal side unequal thick angle steel according to claim 1, wherein the second member is disposed at a position in contact with a long side portion of the unequal side unequal thickness angle steel. 4. The apparatus for producing unequal side unequal thick angle steel according to any one of claims 1 to 3, wherein the second member is configured to be movable in the vertical direction. A third member is provided on the outlet side of the rolling mill, the third member regulating the downward movement of the steel slab by contacting the lower surface of the steel slab rolled by the rolling mill. 5. The apparatus for producing an unequal side unequal thickness angle steel according to any one of 1 to 4. 2. A plurality of hole molds, wherein the first member and the second member are provided on the outlet side of each hole mold, and the arrangement positions of the second members are different among the plurality of hole molds. 6. The apparatus for producing unequal side unequal thick angle steel according to any one of items 5 to 5. A method for producing unequal side unequal thickness chevron to produce unequal side unequal thickness chevron by passing a steel piece through a rolling mill having a hole mold,
The step of regulating the movement in the left-right direction of the steel slab rolled by the rolling mill by the first member provided on the exit side of the rolling mill;
Regulating the upward movement of the steel slab rolled by the rolling mill by means of the second member provided on the exit side of the rolling mill;
The manufacturing method of an unequal side inequality thick angle steel characterized by including.

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