KR101499940B1 - Apparatus for 'ㄷ' type steel manufacturing and manufacturing method using the same - Google Patents

Abstract

One embodiment of the present invention includes a web and a cooling image for cooling a 'U' shaped steel having a first flange and a second flange provided on both sides of the web, The cooling phase includes a first cooling water supply part for injecting cooling water into the first flange of the 'C' shaped steel supplied to the inlet side; A conveying unit for guiding the 'C' shaped steel supplied to the inlet side to the outlet side; And a second cooling water supply unit provided between the inlet side and the outlet side for cooling the lower portion of the 'C' shaped steel which is moved by spraying the cooling water upward, and a method of manufacturing the 'C' shaped steel pipe .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a '

More particularly, the present invention relates to an apparatus for manufacturing a '' 'shaped steel and, more particularly, to a method of manufacturing a' '' shaped steel by reducing a temperature deviation between a first flange and a second flange during cooling of a ' And a method of manufacturing the same.

Generally, '' 'shaped steel is widely used in civil engineering, construction and machinery fields.

The 'U' shaped steel is manufactured by heating the rolled material such as slab, billet, and bloom in a heating furnace, followed by rough rolling, intermediate rolling and finishing rolling.

This rolling process can be carried out, for example, with a two-stage mill.

The two-stage rolling mill has a multi-stage upper rolling roll provided on the upper side and a lower rolling roll provided on the lower side, and the rolling material is gradually pressurized from the upper and lower parts to produce a 'U' shaped steel. The high-temperature '' 'shaped steel rolled by the two-stage rolling mill is moved to the cooling bed and cooled.

FIG. 1 is a schematic view showing a conventional cooling phase, and FIG. 2 is an exemplary view showing a '?'

As shown in FIG. 1 and FIG. 2, the 'C' shaped steel 10, which is guided to the cooling phase 400, is cooled in the cooling phase 400 by a process of air cooling and water cooling Lt; / RTI > In other words, in the cooling phase 400, mainly the air cooling is performed for the 'C' shaped steel 10, and spray cooling using cooling water is performed in parallel for increasing the cooling rate.

For example, the cooling process may be performed by applying only the air cooling method to the high-temperature 'C' shaped steel 10 in the cooling phase 400, but in this case, the cooling time is long and the productivity of the product is low have. Therefore, in order to shorten the cooling time of the 'C' shaped steel 10, the air cooling method and the water cooling method are applied together.

Specifically, the 'C' shaped steel 10 supplied to the inlet side 410 of the cooling bed 400 is moved to the outlet side 420 of the cooling bed 400 through the conveying unit 440 and cooled . A spray zone 430 in which a water cooling process is performed is formed in the cooling phase 400 so that the cooling water is directly sprayed to the lower portion of the ' .

However, the cooling water injected from the spray zone 430 is concentrated only on the web 11 and the second flange 13 of the 'C' shaped steel 10 conveyed in a tilted form, so that the first flange 12 is cooled There is a problem in that it becomes weak. That is, in the spray zone 430, there is a problem that only the web 11 and the second flange 13 are rapidly cooled. In addition, the scattered cooling water can be moved to the housing space 15 of the 'C' shaped steel 10 while bumping against the 'C' shaped steel 10 and the cooling water moved into the housing space 15 The tilted '' 'shaped section (10) is tilted at the bottom.

As a result, the temperature difference between the second flange 13 and the first flange 12 of the 'C' shaped steel sheet 10 greatly increases. That is, the temperature difference between the side of the second flange 13 on the side of the second flange 13 and the side of the first flange 12 is larger than the side on the side of the first flange 12 And the temperature difference between the side of the second flange 13 and the side of the first flange 12 is different from that of the first flange 12 by the amount of contraction of the ' There is a problem that deflection occurs due to thermal deformation as shown in FIG.

In practice, when water-cooling treatment is performed on the web 11 and the second flange 13 in the spray zone 430, a temperature difference of 50 占 폚 occurs between the first flange 12 and the second flange 13 This causes a deflection of 1 to 2 m based on the 50 m-long 'U' shaped steel 10.

The 'C' shaped steel strip 10 shown in FIGS. 1 and 2 is produced in the CUP type, and the 'C' shaped steel strip 10 in the CUP type has an open top side. On the other hand, the CAP type is a shape in which the CUP type is inverted and the lower side of the 'U' shape steel is opened.

There is a problem that the cooling water is accumulated in the housing space 15 of the 'C' shaped steel 10 and the CAP Type " shaped < / RTI > shaped steel to the cooling phase 400 to perform the cooling of the shaped steel.

However, when the 'C' shaped steel produced in the CAP type is supplied to the cooling phase 400, the 'C' shaped steel produced in the CAP type has a small contact area with the transfer part 440, There is a problem that can not be supported. Therefore, it is difficult to transfer the 'C' shaped steel to the outlet side 420 of the cooling bed 400.

In order to solve the above problems, a technical problem of the present invention is to reduce the temperature difference between the first flange and the second flange during cooling of the 'C' And a method for manufacturing the same.

According to an aspect of the present invention, there is provided a method of cooling a " " shaped steel having a first flange and a second flange provided on both sides of the web and the web, Wherein the cooling phase comprises: a first cooling water supply part for injecting cooling water into the first flange of the 'C' shaped steel supplied to the inlet side; A conveying unit for guiding the 'C' shaped steel supplied to the inlet side to the outlet side; And a second cooling water supply unit provided between the inlet side and the outlet side for cooling the lower part of the 'C' shaped steel which is moved by spraying the cooling water to the upper side.

According to an embodiment of the present invention, the transfer unit may include a stationary grid in which the 'C' shaped steel is placed and cooled; A movable grid which is alternately provided with the fixed grid and moves the 'C' shaped steel secured to the fixed grid; And a control unit for controlling the upward movement, the forward movement, the downward movement and the backward movement of the moving grid.

According to an embodiment of the present invention, the conveying portion includes a seating portion for supporting a lower surface of the web and a second flange, and the seating portion has a shape of 'V', and the length L1 of the web and the length of the second flange (L2).

In one embodiment of the present invention, when the length of the first flange is 65 mm, the first cooling water supply unit injects cooling water with a water density of 300 L / m 2 · min. When the length of the first flange is 75 mm Coolant injection can be achieved with a water density of 260 L / m 2 · min.

One embodiment of the present invention relates to a rolling mill for rolling a rolled material to produce the "? 'Shaped steel; And a calibrator for calibrating the 'C' shaped steel cooled from the cooling phase.

Meanwhile, in the present invention, a plurality of rolling mill rolls a rolled material and is rolled into a 'U' shaped steel having a first flange and a second flange provided on both sides of the web and the web, step; The first cooling water supply part injects cooling water into the first flange of the 'C' shaped steel supplied to the inlet side of the cooling bed; Guiding the 'C' shaped steel supplied to the inlet side of the cooling bed to the outlet side of the cooling bed; And the second cooling water supply part is provided between the inlet side and the outlet side of the cooling bed, and cooling the lower part of the 'C' shaped steel which is moved by spraying the cooling water to the upper side, to provide.

The effect of the '' 'shaped steel manufacturing apparatus and the manufacturing method thereof according to the present invention will be described as follows.

First, according to the present invention, the '' 'shaped steel manufacturing apparatus includes a first cooling water supply unit that injects cooling water into a first flange of a' C 'shaped steel supplied to an inlet side of a cooling bed, and a' A second cooling water supply unit for injecting cooling water into the web of the section steel and the second flange may be provided so that the 'C' shaped steel can be cooled at a uniform temperature. That is, the first flange, the second flange, and the web can prevent the occurrence of warping of the 'C' shaped steel due to the temperature deviation.

Secondly, according to the present invention, the '' 'shaped steel manufacturing apparatus can improve the cooling rate of the' '' shaped steel by applying both the air cooling method and the water cooling method to the 'ㄷ' shaped steel in the cooling phase. That is, the productivity of the 'C' shaped steel can be increased.

Thirdly, according to the present invention, the seat portion has a length corresponding to the web and the second flange, and supports the 'C' -shaped steel, so that when moving the 'C' shaped steel from the inlet side to the outlet side of the cooling water, It is possible.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a schematic diagram showing a conventional cooling phase.
FIG. 2 is an exemplary view showing a '?'
FIG. 3 is a schematic cross-sectional view illustrating a process of rolling 'C' shaped steel from a two-stage rolling mill according to an embodiment of the present invention.
4 is a schematic diagram illustrating a cooling phase in accordance with one embodiment of the present invention.
FIG. 5 is an exemplary view showing a '?' Shaped steel strip to be moved on a cooling stage according to an embodiment of the present invention.
6 is a flowchart illustrating a method of manufacturing a 'C' shaped steel according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a schematic cross-sectional view illustrating a process of rolling a 'C' shaped steel from a two-stage rolling mill according to an embodiment of the present invention, wherein the 'C' shaped steel is slab, billet, ) Are heated in a heating furnace, and then subjected to rough rolling, intermediate rolling and finishing rolling.

This rolling process can be performed by a rolling mill, and the two-stage rolling mill 100 having the upper rolling roll 110 and the lower rolling roll 120 rolls the rolling material into a 'C' shape steel.

Referring to FIG. 3, the two-stage rolling mill 100 is provided with an upper rolling roll 110 provided on the upper side and a lower rolling roll 120 provided on the lower side. The upper rolling roll 110 and the lower rolling roll 120 form various grooves and are formed in a multi-stage structure so that the rolling material 1 is sequentially pressed to produce a 'C' shaped steel.

Specifically, a top roll 110 of a two-stage rolling mill 100 is formed to press the top of the web 11 and the inner side of the first flange 12 and the inner side of the second flange 13. The lower rolling roll 120 is formed to press the lower portion of the web 11 of the 'C' shaped steel 10, the outer surface of the first flange 12 and the outer surface of the second flange 13.

The rolled material 1 is rolled from the two-stage rolling mill 100 to a "? 'Shaped steel 10 at a high temperature of 1000 to 1100 ° C. The 'C' shaped steel 10 rolled from the two-stage rolling mill 100 is moved to the cooling phase 200 (see FIG. 4) and cooled to a temperature of 70 ° C. or lower. Next, the 'C' shaped steel 10 subjected to the cooling treatment on the cooling phase is supplied to the calibrator 300 (see FIG. 4) and is manufactured as a final product through a calibrating operation.

FIG. 4 is a schematic view showing a cooling phase according to an embodiment of the present invention, FIG. 5 is an exemplary view showing a 'C' shaped steel moving on a cooling stage according to an embodiment of the present invention, FIG. 4 is a flowchart showing a method of manufacturing a 'C' shaped steel according to an embodiment.

As shown in FIGS. 4 to 6, the 'C' shaped steel manufacturing apparatus 1000 may include a rolling mill, a cooling bed 200, and a calibrator 300. The rolling mill is equipped with a first flange 12, a second flange 13 and a web 11 by pressurizing the rolling material 1 (see Fig. 3) with respective rolling rolls at the top and bottom, A two-stage rolling mill 100 for rolling into a 'C' shaped steel 10 may be used. The 'C' shaped steel 10 rolled from the two-stage rolling mill 100 is moved to the cooling phase 200 and cooled.

The cooling phase 200 may include a first cooling water supply unit 210, a transfer unit 220, and a second cooling water supply unit 230. The first cooling water supply unit 210 is provided at one side of the inlet side 241 of the cooling bed 200 and is connected to one side of the " e " shaped steel 10 moved to the inlet side 241 of the cooling bed 200 So that the cooling water is cooled.

At this time, a transfer carrier (not shown) is provided at the inlet side 241 and the outlet side 242 of the cooling image 200 to form a 'C' shape that is inserted into the inlet side 241 of the cooling image 200 So that the section steel 10 can be seated on the transfer section 220. Such a transfer carrier (not shown) may be a turner, a crane, or the like, but is not limited thereto. At this time, the inlet side 241 and the outlet side 242 of the cooling bed 200 are made up of roller tables equipped with rollers to assist the movement of the 'C' shaped steel.

The temperature of the 'C' shaped steel 10 supplied to the inlet side 241 of the cooling bed 200 may reach 900 to 1000 ° C, but is not limited thereto.

As described above, the 'C' shaped steel 10 guided to the inlet side 241 of the cooling bed 200 is subjected to water cooling by the first cooling water supply unit 210. At this time, the first cooling water supply unit 210 is connected to the first flange (not shown) of the 'C' shaped steel 10 in a state that the 'U' shaped steel bar 10 is completely moved to the inlet side 241 of the cooling bed 200 12 is subjected to water-cooling treatment. That is, the first cooling water supply unit 210 uniformly cools only the first flange 12 by injecting cooling water only to the first flange 12.

The second cooling water supply unit 230 of the cooling fan 200 can cool only the web 11 and the second flange 13 after the first flange 12 is first cooled, 'Shaped steel 10 to be uniformly cooled.

The first cooling water supply part 210 is provided with a water density of 300 L / m < 2 >.min when the length of the first flange 12 of the 'U' shaped steel 10 (length protruding from the bottom surface of the web) When the length of the first flange 12 of the 'C' shaped steel 10 is 75 mm, the cooling water is injected at a water density of 260 L / m 2 · min. That is, since the cooling water is injected in a predetermined amount in the first cooling water supply part 210, the water density becomes lower as the length of the first flange 12 is longer. The water pressure of the cooling water injected from the first cooling water supply unit 210 is maintained at 5 bar, and the cooling water is injected.

The first cooling water supply unit 210 injects cooling water into the first flange 12 to cool the first flange 12 so that the temperature of the first flange 12 is lower than the temperature of the second flange 13 by 50 ° C. And cooled.

Shaped steel 10 having been cooled from the first cooling water supply part 210 to the first flange 12 is moved to the outlet side 242 of the cooling bed 200 by the conveying part 220. At this time, the conveying unit 220 conveys the 'C' shaped steel 10 and cools it through the air cooling.

The transfer unit 220 may include a stationary grid 221, a movement grid 222, and a control unit (not shown). The stationary grid 221 and the movement grid 222 are alternately provided to connect the 'U' shaped steel 10 supplied to the inlet side 241 of the cooling bed 200 to the outlet side 242 of the cooling bed 200, .

The fixed grid 221 supports the lower surface of the 'C' shaped steel bar 10 and allows the 'C' shaped steel bar 10 to be air cooled. The fixed grid 221 is fixed to the cooling bed 200 and the stationary grid 221 does not move and supports the 'C' shaped steel 10.

The moving grid 222 is configured to support the 'C' shaped steel 10 and the 'C' shaped steel 10 to be introduced into the cooling bed 200. The moving grid 222 moves the 'U' shaped steel 10 supplied to the inlet side 241 of the cooling bed 200 to the outlet side 242 of the cooling bed 200.

At this time, the only difference is whether the fixed grid 221 and the moving grid 222 are configured to be fixed to the cooling bed 200 or to move the 'C' shaped steel 10.

The stationary grid 221 and the movement grid 222 are formed with a seating part 225 to stably support the 'C' shaped steel 10. The seating part 225 supports the web 11 and the second flange 13 and stably feeds the 'U' shaped steel 10 to the outlet side 242 of the cooling bed 200. The seating part 225 is formed to correspond to the length of the web 11 and the second flange 13 in a state of being inclined at a predetermined angle and is supported by the cooling image 200 in a state of stably supporting the ' To the outlet side (242) of the outlet. That is, the seating portion 225 is made to support the entire length L1 of the web 11 and the length L2 of the second flange 13.

5, the length L1 of the web 11 refers to the connection length of the web 11 connecting the first flange 12 and the second flange 13 and the length L1 of the second flange 13 Refers to a length protruding from the bottom surface of the web 11. The seating part 225 is formed in a shape of 'V' to stably support the 'C' shaped steel bar 10.

The moving grid 222 moves the 'U' shaped steel 10 in a state where the movable grid 222 is alternately arranged with the fixed grid 221. The moving grid 222 is provided with a driving unit (not shown), and the moving grid 222 moves the 'U' shaped steel 10 through a circulating operation (upward, downward, .

That is, the 'U' shaped steel 10 mounted on the stationary grid 221 is mounted on the moving grid 222 by the upward motion of the moving grid 222, and the 'U' (10) advances to the outlet side (242) of the cooling bed (200) by the advancing movement of the moving grid (222). Next, the moving grid 222 places the 'U' shaped steel 10, which is seated on the moving grid 222, in the downward movement with the fixed grid 221. Next, the movement grid 222 is moved backward by the backward movement.

Thus, the moving grid 222 moves the 'U' shaped steel 10 to the outlet side 242 of the cooling image 200 through the ascending operation, the advancing operation, the descending operation and the backward operation.

At this time, it goes without saying that the operator can selectively adjust the upward movement, the forward movement, the downward movement, and the backward movement of the mobile grid 222 by operating the control unit (not shown).

The second cooling water supply unit 230 is positioned between the inlet side 241 and the outlet side 242 of the cooling bed 200 and injects the cooling water to the lower portion of the ' That is, the second cooling water supply unit 230 is provided in the spray zone 235, and the lower portion of the 'U' shaped steel 10 is cooled by injecting cooling water upward.

The second cooling water supply unit 230 is composed of an atomizing nozzle (not shown) for finishing water using air so that the web 11 and the second flange 13 are separated from the atomizing nozzle And cooled by the injected cooling water. At this time, the air pressure injected from the atomizing nozzle is 3 bar, and the water 11 and the second flange 13 are cooled at a rate of 1.5 L / min.

In other words, the web 11 and the second flange 13 are water-cooled by the second cooling water supply part 230 of the 'U' shaped steel 10 mounted on the transfer part 220 in an inclined state, The cooling water which is scattered by colliding against the web 11 and the second flange 13 is solidified in the accommodation space 15 of the U-shaped steel 10 to cool the web 11 and the second flange 13 .

That is, the 'U' shaped steel 10 moved to the outlet side 242 of the cooling bed 200 is cooled by the first cooling water supply unit 210 and the second cooling water supply unit 230, 12, the second flange 13 and the web 11 can be uniformly cooled without temperature variations. Therefore, it is possible to prevent the warping of the 'C' shaped steel 10 from occurring.

A plurality of rolling mills are used for rolling the rolling material 1 to form a web 11 and a first flange 12 ) And the second flange 13 (step S100).

Next, the 'C' shaped steel sheet 10 rolled from the rolling mill is guided to the inlet side of the cooling bed 200, and the first cooling water supply unit 210 injects cooling water to the first flange 12, 1 flange 12 is water-cooled (S200)

Next, the 'C' shaped steel 10, which has been subjected to the first water cooling process by the first cooling water supply unit 210, is air-cooled while being placed on the conveyance unit 220, 242. (S300)

At this time, the second cooling water supply part 230 provided between the inlet side 241 and the outlet side 242 of the cooling bed 200 performs the secondary water cooling process on the 'C' shaped steel 10. Here, the second cooling water supply unit 230 injects cooling water into the lower part of the 'C' shaped steel 10 to cool the 'C' shaped steel 10 by water cooling. That is, the second cooling water supply unit 230 performs secondary water cooling process on the second flange 13 and the web 11. [

Accordingly, the 'U' shaped steel 10 is cooled by the first cooling water supply unit 210 and the second cooling water supply unit 230, respectively, so that the first flange 12 and the second flange 13 and the web 11 are cooled, Can be cooled to a uniform temperature (S400)

Next, the 'C' shaped steel 10 guided to the outlet side 242 of the cooling bed 200 is supplied to the calibrator 300 to perform a calibration operation on the 'C' shaped steel 10 to obtain a final product Is produced.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

1: rolled material 10: 'C' shaped steel
11: web 12: first flange
13: second flange 15: accommodation space
100: two-stage rolling mill 110: upper rolling roll
120: Lower rolling roll 200: Cooling phase
210: first cooling water supply unit 220:
221: stationary grid 222: movement grid
225: seat part 230: second cooling water supply part
235: spray zone 300: calibrator
1000: 'C' shaped steel manufacturing equipment

Claims (6)

And a cooling phase for cooling the "?'Shaped steel having a first flange and a second flange provided on both sides of the web,
The cooling phase,
A first cooling water supply part for injecting cooling water into the first flange of the 'C' shaped steel supplied to the inlet side;
A conveying unit for guiding the 'C' shaped steel supplied to the inlet side to the outlet side; And
And a second cooling water supply unit provided between the inlet side and the outlet side for cooling the lower portion of the 'C' shaped steel which is moved by spraying the cooling water upward,
The conveyance unit includes a fixed grid on which the 'C' shaped steel is placed and cooled, a movable grid alternately provided with the fixed grid, for moving the 'U' shaped steel secured to the fixed grid, And a controller for controlling the operation, the forward operation, the down operation, and the reverse operation of the '''shaped steel. delete The method according to claim 1,
Wherein the receiving portion includes a seating portion for supporting a bottom surface of the web and a second flange, the seating portion having a shape of 'V', and having a length L1 of the web and a length L2 of the second flange, Shaped steel pipe. The method according to claim 1,
When the length of the first flange is 65 mm, the first cooling water supply unit injects cooling water with a water density of 300 L / m 2 · min. When the length of the first flange is 75 mm, the quantity of 260 L / Wherein the cooling water is injected at a predetermined temperature. The method according to claim 1,
A rolling machine for rolling the rolled material into the '''shapedsteel; And
And a calibrator for calibrating the 'C' shaped steel moved from the cooling phase. Rolling a plurality of rolling mills into a "U" shaped steel having a first flange and a second flange provided on both sides of the web and the web by rolling the rolled material;
The first cooling water supply part injects cooling water into the first flange of the 'C' shaped steel supplied to the inlet side of the cooling bed;
Guiding the 'C' shaped steel supplied to the inlet side of the cooling bed to the outlet side of the cooling bed; And
And the second cooling water supply part is provided between the inlet side and the outlet side of the cooling bed, and cooling the lower part of the 'C' shaped steel which is moved by spraying the cooling water upward,
The conveyance unit includes a fixed grid on which the 'C' shaped steel is placed and cooled, a movable grid alternately provided with the fixed grid, for moving the 'U' shaped steel secured to the fixed grid, And a control unit for controlling the operation, the forward operation, the downward operation, and the reverse operation.

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