KR101758496B1

KR101758496B1 - Apparatus for Cooling Wire-rod Coil

Info

Publication number: KR101758496B1
Application number: KR1020150183484A
Authority: KR
Inventors: 이준태; 시성규; 심성민
Original assignee: 주식회사 포스코
Priority date: 2015-12-22
Filing date: 2015-12-22
Publication date: 2017-07-17
Also published as: KR20170075045A

Abstract

A wire coil cooling apparatus according to an embodiment of the present invention includes a blowing unit disposed corresponding to a feed path of a wire coil conveyed on a roller conveyor and provided to cool the wire coil to blow air; A nozzle member provided on the blowing unit and forming a blowing opening disposed in a width direction of the roller conveyor; And a cover unit disposed on the nozzle member so as to be movable in a conveying path direction of the wire member coil so that the blowing opening is opened or closed, wherein the cover unit includes a conveying roller of the roller conveyor when the blowing opening is closed, And a heating unit disposed between the heating unit and the heating unit.

Description

[0001] Apparatus for Cooling Wire-rod Coil [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire-coil cooling apparatus for cooling wire-wound coils wound and fed.

Generally, a wire coil process is a process in which a steel strip is rolled and formed into a wire coil, water cooled, a water-cooled wire coil is rolled up, and a ring is placed on the roller conveyor in a ring form.

At this time, the air-cooled wire coil is quenched or quenched according to the required mechanical properties. Particularly, in the case of a wire coil requiring strength, cooling air is sprayed by a blower installed in a lower portion of a roller conveyor to quench, and in the case of a wire coil requiring a high elongation, a method of cooling is used.

However, in order to cool down, a cooling device for lowering the cooling rate is required. However, such a cooling device has a problem in that it is difficult to control the cooling rate, thereby lowering the reliability of the product.

SUMMARY OF THE INVENTION One of the technical problems to be solved by the technical idea of the present invention is to provide a wire-wound coil cooling apparatus which can easily control the cooling rate.

According to an embodiment of the present invention, there is provided an air blowing apparatus comprising: a blowing unit disposed corresponding to a conveying path of a wire coil conveyed on a roller conveyor, A nozzle member provided on the blowing unit and forming a blowing opening disposed in a width direction of the roller conveyor; And a cover unit disposed on the nozzle member so as to be movable in a conveying path direction of the wire member coil so that the blowing opening is opened or closed, wherein the cover unit includes a conveying roller of the roller conveyor when the blowing opening is closed, And a heating unit disposed between the heating unit and the heating unit.

For example, the heating portion may be disposed at 80% of at least the rear end of the feed path of the wire coil.

For example, the heating unit may be long in the width direction of the conveyance path, and the length of the heating unit may be 70% to 80% of the width of the conveyance path.

For example, the heating unit may include a plurality of heaters arranged long in the width direction of the conveyance path.

For example, the plurality of heaters can heat the heating temperature of the heater disposed in the central region in the width direction of the conveyance path to a temperature lower than the heating temperature of the heater disposed in the edge region.

For example, the cover unit may include: a cover that covers the blowing opening; And a driving member for driving the cover so that the blowing opening is automatically opened and closed.

For example, the cover unit may be formed of a refractory material.

It is possible to provide a wire-wound coil cooling apparatus having a cover and a heater, which can easily control the cooling rate.

The various and advantageous advantages and effects of the present invention are not limited to the above description, and can be more easily understood in the course of describing a specific embodiment of the present invention.

1 is a schematic view of a wire coil cooling apparatus according to an embodiment of the present invention.
2 (a) and 2 (b) are views showing the opening and closing process of the cover unit of Fig.
3 is a schematic plan view showing the wire-wound coil cooling apparatus of Fig.
4A and 4B are graphs showing the widthwise direction cumulative density and temperature variation of the wire coil.
5 is a photograph showing the temperature distribution of the infrared image according to the deposition density of the wire coil.
6 is a graph showing the relationship between the temperature deviation of the wire coil and the heat to be heated.

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

The embodiments of the present invention may be modified into various other forms or various embodiments may be combined, and the scope of the present invention is not limited to the following embodiments. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings may be exaggerated for clarity of description, and the elements denoted by the same reference numerals in the drawings are the same elements.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. As used herein, terms such as " comprise, "" comprise ", or "have ", and the like, specify features, numbers, steps, operations, elements, parts, or combinations thereof described in the specification Steps, operations, elements, parts, or combinations thereof, which do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof. The term "and / or" includes any and all combinations of one or more of the listed items.

Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers and / or portions, these members, components, regions, layers and / It is obvious that no. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

1 is a schematic view of a wire coil cooling apparatus according to an embodiment of the present invention.

In general, a wire rod production process is a process in which a billet is heated to approximately 1000 to 1200 DEG C in a heating furnace, and then the hot circular wire material subjected to rough rolling, intermediate rough rolling, intermediate finishing rolling and finishing rolling is cooled in a water- The wire coil is produced through the process and then put into the correction line.

At this time, according to the rolling step, the coil of the wire rod will produce a small diameter wire having a diameter of 5.5 to 15 mm and a wire having a diameter of 15 to 42 mm.

On the other hand, in the case of a small-diameter wire, if the coil is formed into a non-concentric circular coil shape through a winding device such as a laying head, heat treatment is performed in parallel with the conveyance of the conveying device (conveying conveyor) reforming tub, and then injected into the test line.

That is, as shown in Fig. 1, the material rolled in the rolling mill 10 is cooled by the water-cooled bar 20 cooled by cooling water, and is wound on the laying-head 30 through the winding machine.

The wire-wound coil 1 thus wound is placed and dropped continuously on the roller 42 of the conveying conveyor 40. The wound wire-wound coil is passed through the conveying conveyor 40 while being blown to the blowing unit 50, That is, the cooling air blown from the cooling medium.

Then, the wound wire coil 1 is dropped into the collector 60 associated with the conveying conveyor and integrated into the final product.

As shown in FIG. 1, the wire coil continuously wound in the form of a coil in the laying-head 30, which is a winding machine, is fed to the roller conveyor 40 While being dropped on the roller 42 and being conveyed, air is blown to the conveying conveyer side from the air blowing unit 50 provided with a plurality of units along the conveying conveyor at the lower part of the conveying conveyor. Such blown air passes through the wire- The wire coil in the high temperature state is cooled to a low temperature before the accumulation is performed, and the heat treatment process of the wire coil is performed.

At this time, the temperature of the wire-wound coil wound up and dropped by the feed roller is approximately 800 to 900 DEG C, and the wire-coil after cooling is approximately 300 to 500 DEG C.

The blowing unit 50 includes a duct 54 provided at a lower portion of the blower 52 and a nozzle member 57 for forming a blowing opening 56 at an upper portion of the duct 54 . The wind speed of the cooling air supplied from the feed opening 56 is approximately 20 to 50 m / s.

3, the wire coil 1 can be divided into three parts, that is, the center part CN, the middle part MI and the edge ED, which are placed in a non-concentric circle shape .

On the other hand, although such an air blowing unit 50 is also called a stellmor, it provides an advantage that various cooling rates can be obtained according to the cooling conditions such as the intensity of the wind power or the feeding speed of the wire rod coil 1 , There is a problem in implementing the same blowing in the width direction of the wire coil 1.

4A, when the wire-wound coil 1 is extracted from the laying-head and is transported in a full-stroke on the transporting roller 42 of the transporting conveyor 40, the edge of the wire- The difference in the lamination density between the center portion ED and the center portion CN is considerably different between the edge portion ED and the central portion CN and therefore, as shown in FIG. 4B, Or more.

5 is a photograph showing a measurement of the temperature distribution in the width direction of the wire coil (ring) at an actual operating site with an infrared thermography thermometer. In addition to the cooling imbalance caused by the difference in the overlapping density of the wire coils (between the rings) Since the sheets are one-dimensionally stacked and cooled on the conveyor, the inter-lap overlap is severely generated.

That is, a difference in the overlapping density of the wire coil causes a hot-spot portion that does not cool well in the wire coil. The hot-spot portion overlapping with the wire coil is not easily cooled by the air blowing method, and even if the air blowing amount is increased, the material deviation is caused by the cooling deviation.

As the distance from the laying-head 30 increases, there is a problem in that the difference in temperature history between the center portion CN of the wire-wound coil 1 and the edge ED increases.

That is, the temperature variation due to the difference in the cooling density between the center portion and the edge portion of the wire coil due to the difference in the rack density and the occurrence of the hot-spot portion (overlapping portion) And eventually leads to product failure.

In addition, there is a need to lower the cooling rate depending on the coil of the wire rod produced, and there is a limit to lowering the cooling rate even by adjusting the blowing amount.

The wire coil cooling apparatus according to an embodiment of the present invention includes an air blowing unit 50 disposed on a roller conveyor 40 and provided to cool the wire coil 1 to blow air, The cover unit 70 may include a nozzle member 57 forming a blowing opening 56 and a cover unit 70 movably arranged to open and close the blowing opening 56, And a heating unit (74) disposed between the conveying rollers of the roller conveyor when the conveying rollers (56, 56) are closed. The nozzle member 57 may be provided as a nozzle plate forming the blowing opening 56. [ Therefore, the nozzle member will be described as the nozzle plate 57 in the following.

1, the cover unit 70 is mounted on the nozzle plate 57 such that the blowing opening 56 of the nozzle plate 57 is opened and closed horizontally along the moving path direction of the wire coil 1, So that it can be moved.

The configuration and operation of the cover unit 70 will be described in detail with reference to Figs. 2 (a) and 2 (b). 2 (a) and 2 (b) illustrate the opening and closing process of the cover unit of Fig. 1, Fig. 2 (a) The air blowing opening 56 is opened.

The cover unit 70 may include a plurality of covers 71 and 72. The plurality of covers 71 and 72 are connected to the driving unit 75 by a rail 73, To move horizontally back and forth along the movement path. The plurality of covers 71 and 72 are disposed so as to correspond to the respective blowing openings 56. When the rails 73 are moved by the driving unit 75, 56 can be individually opened and closed automatically. Therefore, the cooling air flowing through the air blowing opening 56 is blocked, so that the cooling rate of the wire coil 1 can be controlled.

First, referring to Fig. 2 (a), a structure in which the blowing opening 56 is closed will be described. The plurality of covers (71, 72) are provided to be large enough to cover the blowing opening (56), so that the blowing opening (56) can be closed. 3, the plurality of covers 71 and 72 include a first cover 71 disposed between the conveying rollers 42 and a second cover 70 disposed below the conveying rollers 42 when viewed from above, (Not shown). The blowing opening 56 may include a first blowing opening 56b disposed between the conveying rollers 42 and a second blowing opening 56a disposed below the conveying roller 42. [

The first cover 71 may be disposed between the conveying rollers 42 when the blowing opening 56 is closed and directly exposed to the lower portion of the wire coil 1. [ A heating portion 74 is disposed on the first cover to further lower the cooling rate of the wire coil 1. [

The heating unit 74 may be arranged to be long in the width direction of the conveyance path and have a length W2 of 70% to 80% with respect to the conveyance path W1. 4A, the edge ED of the wire coil 1 has a very high compact density ratio as compared to the center portion CN and the middle portion MI, The relative cooling rate is significantly lower. Therefore, the heating portion 74 can be disposed only in the center portion CN and the middle portion MI, so that the cooling speed of the wire-wound coil 1 can be made uniform as a whole.

The heating unit 74 may include a plurality of heaters 74a and 74b arranged in the width direction of the conveyance path. The heating temperatures of the plurality of heaters 74a and 74b may be different from each other , The heating temperature of the central portion (CN) can be made lower than the heating temperature of the middle portion (MI). 4A, since the intermediate portion MI of the wire coil 1 is higher than that of the center portion CN, the cooling rate of the middle portion MI is relatively higher than that of the center portion CN low. Therefore, by making the heating temperature of the intermediate portion MI lower than the central portion CN, the cooling speed of the wire-wound coil 1 can be made uniform as a whole.

The plurality of heaters 74a and 74b reduce the cooling rate of the wire rod coil 1 to 0.2 ° C / s or less in order to prevent deformation of the wire rod coil 1 due to the difference in cooling rate as the wire rod coil 1 is cooled Each having an output of 45 kW or more. Fig. 6 is a graph showing the relationship between the temperature deviation of the wire coil and the heat to be heated. It is understood that an output of 45 kW or more is required to reduce the cooling rate to 0.2 캜 / s or less.

The heating section 74 may be disposed entirely in the conveyance path of the wire member coil 1 but may be disposed at a portion of the front end L2 close to the winder 30 in the entire conveyance path L1, And only 80% of the rear end. Immediately after the wire-wound coil 1 is dropped onto the roller 42 of the conveying conveyor 40 via the raining-head 30, the temperature of the wire-wound coil 1 is high and the center portion CN, the middle portion MI, The temperature difference of the edge (ED) is not large. It is effective that the wire rod coil 1 is fed to a distance L2 of 20% of the feeding path and heated to a certain degree before it becomes air-cooled. Therefore, when the heating portion 74 is disposed only at 80% of the rear end of the entire conveying path L1 except for the front end L2 close to the take-up unit 30, the heating portion 74 is provided over the entire conveying path L1. It is possible to reduce the cost required for heating while achieving substantially the same heating effect as in the case of disposing the heat sink.

The first and second covers 71 and 72 are formed of a refractory material and can be prevented from being deformed by the heat radiated from the wire rod coil 1.

Fig. 2 (b) shows that the cooling air is supplied through the air blowing opening 56 by driving the driving part 75 to open the air blowing opening 56. Fig. Therefore, the wire-wound coil cooling device of this embodiment can easily control the supply of the cooling air according to the necessity of the wire-wound coil.

Therefore, the wire-wound coil cooling apparatus according to the present embodiment can open / close the blowing opening 56 as needed, and can heat the wire-wound coil 1, so that the speed at which the wire- And the cooling rate of the wire coil 1 can be adjusted by adding only the cover unit 70 to the existing cooling facility without changing the equipment of a large scale.

The present invention is not limited by the above-described embodiment and the accompanying drawings, but is intended to be limited by the appended claims. It will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. something to do.

1: wire coil
10: Rolling mill
20: water cannon
30: Leigh-head
40: Roller conveyor
42: Feed roller
50: blowing unit
52: blower
54: Duct
56: blowing opening
57: nozzle plate
60: Collector
70: Cover unit
71, 72: cover
73: Rail
74:

Claims

A blowing unit disposed corresponding to a conveyance path of the wire coil conveyed on the roller conveyor and provided to cool the wire coil to blow air;
A nozzle member provided on the blowing unit and forming a blowing opening disposed in a width direction of the roller conveyor; And
And a cover unit disposed on the nozzle member so as to be movable in the direction of the feed path of the wire member coil so that the blowing opening is opened and closed,
Wherein the cover unit includes a first cover disposed between a plurality of conveying rollers of the roller conveyor and a second cover disposed under the plurality of conveying rollers when the blowing opening is closed, Wherein the second cover is disposed alternately on the conveying path of the wire coil, and the first cover includes a heating portion disposed toward the direction between the plurality of conveying rollers.

The method according to claim 1,
Wherein the heating portion is disposed at least 80% of at least the rear end of the feed path of the wire coil.

The method according to claim 1,
Wherein the heating section is arranged long in the width direction of the conveyance path, and the length of the heating section is 70% to 80% of the width of the conveyance path.

The method of claim 3,
Wherein the heating section includes a plurality of heaters arranged long in the width direction of the conveyance path.

5. The method of claim 4,
Wherein said plurality of heaters are heated at a temperature lower than a heating temperature of a heater disposed in a peripheral region in a central region in a width direction of said conveyance path.

The method according to claim 1,
Wherein the cover unit includes: a cover that covers the blowing opening; And
And a driving member for driving the cover so that the blowing opening is automatically opened and closed.

The method according to claim 1,
Wherein the cover unit is made of a refractory material.