KR101316512B1 - Method using apparatus for cooling a strip - Google Patents

Method using apparatus for cooling a strip Download PDF

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Publication number
KR101316512B1
KR101316512B1 KR1020100135313A KR20100135313A KR101316512B1 KR 101316512 B1 KR101316512 B1 KR 101316512B1 KR 1020100135313 A KR1020100135313 A KR 1020100135313A KR 20100135313 A KR20100135313 A KR 20100135313A KR 101316512 B1 KR101316512 B1 KR 101316512B1
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KR
South Korea
Prior art keywords
plate
cooling
injection
sheet
cooling water
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KR1020100135313A
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Korean (ko)
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KR20120073521A (en
Inventor
이필종
정은호
권휘섭
성언식
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주식회사 포스코
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Priority to KR1020100135313A priority Critical patent/KR101316512B1/en
Publication of KR20120073521A publication Critical patent/KR20120073521A/en
Application granted granted Critical
Publication of KR101316512B1 publication Critical patent/KR101316512B1/en

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Abstract

The present invention relates to a sheet cooling apparatus and a sheet cooling method using the same, and more particularly, to a sheet cooling apparatus capable of adjusting the injection degree of the cooling water according to the state of the sheet and a sheet cooling method using the same. Plate cooling apparatus according to an embodiment of the present invention includes a first spraying portion provided on the conveying path of the sheet so that the cooling water is sprayed to the upper and lower surfaces of the heated sheet; A second spraying part provided on a conveying path of the sheet material so that the cooling water is sprayed onto the upper and lower surfaces of the heated sheet material; And a pinch roll provided in the conveyance path of the sheet material so that the coolant injected from the first or second jetting portion is uniformly distributed in the sheet material and provided to correct the shape of the sheet material.

Description

Plate cooling method using sheet cooling device {METHOD USING APPARATUS FOR COOLING A STRIP}

The present invention relates to a sheet cooling method using a sheet cooling device, and more particularly, to a sheet cooling method using a plate cooling device that can adjust the injection degree of the cooling water according to the state of the plate.

The high temperature material (slab) manufactured by the continuous casting process and subjected to the heating furnace produces thick plates having a predetermined thickness through rolling steps such as rough rolling mill and finishing mill. do.

For example, as shown in Figure 1, for example, slabs (Slab) produced by the continuous casting process is heated to the target temperature according to the steel grade in the heating furnace (110). After passing through the furnace, the rolling material is subjected to a rolling step 120 such as a roughing mill (RM) and a finishing mill (FM), and then rolls the material to a predetermined thickness, for example, to the thickness of the final product. Produces plate (S).

Next, as illustrated in FIG. 1, the thick plate material S primarily rolled to a predetermined plate thickness through a roughness rolling mill passes through an accelerated cooler 130 for grain refinement or control of transformation structure.

Then, in order to increase the quality of the rolled product (thick plate product) through a leveling step through the leveler, and finally to the cooling table 150 is finished as a final product.

However, in the case where the thick plate product is not normally produced (rolled), as the demand level of the current consumer is stricter day by day, although not shown in a separate drawing, heat treatment or leveling work (plate calibration work) is performed again through a plate deformation measuring system. Finally, the product for which the plate deformation is compensated for, for example, a heavy plate product is shipped.

Therefore, when the cooling is completed, the material, that is, the non-corrective sheet material should be produced without the need for the post-treatment process after the rolling is completed, which affects the product productivity or the unit cost.

In other words, if the produced plate is deformed, it must undergo a separate calibration work, in which case the production cost is increased, as well as the customer delivery rate decreases due to the weight of the logistics load.

Thus, conventionally, in order to cool the thick plate, a laminar jet method, a multi jet method, and a slit slit jet method have been used. However, in the case of the melt-jet cooling method or the slant slit jet cooling method, there is a small variable range of cooling capacity according to the flow rate, and thus there is a problem in that it is difficult to obtain a desired cooling effect when a material or weak cooling is required.

Accordingly, an object of the present invention is to provide a plate cooling method using a plate cooling apparatus capable of adjusting the spraying degree of the coolant according to the state of the plate, which is devised to solve the above problems.

Plate cooling apparatus according to an embodiment of the present invention includes a first spraying portion provided on the conveying path of the sheet so that the cooling water is sprayed to the upper and lower surfaces of the heated sheet; A second spraying part provided on a conveying path of the sheet material so that the cooling water is sprayed onto the upper and lower surfaces of the heated sheet material; And a pinch roll provided in the conveyance path of the sheet material so that the coolant injected from the first or second jetting portion is uniformly distributed in the sheet material and provided to correct the shape of the sheet material.

In one embodiment of the present invention, it is preferred that the first and second spraying portions are operated to spray cooling water to the heated sheet, separately or simultaneously, depending on the state of the heated sheet.

In one embodiment of the present invention, it is preferable that the first injection unit is composed of a plurality of unit headers provided to jet a large amount of cooling water in a jet injection method.

In one embodiment of the present invention, it is preferable that the second injection portion has a spray type injection structure such that a small amount of cooling water is injected in the form of mist.

Plate cooling method according to an embodiment of the present invention, when the strong cooling needs to be applied to the plate passing through the transfer path, the first injection unit is operated to spray the coolant to the plate (S1); When it is necessary to apply a weak cooling to the plate passing through the transfer path, the second injection unit is operated to spray the coolant to the plate (S2); When it is necessary to apply super cooling to the plate passing through the conveyance path, the step of operating the first and second injection unit at the same time (S3); And in at least one of the steps S1 to S3, it is preferable to include a step (S4) in which the pinch roll is operated to uniformly distribute the cooling water along the width direction of the plate.

In addition, the plate cooling method according to an embodiment of the present invention further includes a step (S5) of operating the second injection unit to remove the residual water formed by cooling the plate after the step S4 and the remaining coolant stays on the plate. It is preferable.

The present invention can adjust the degree of injection of the cooling water in accordance with the state of the plate material, it is possible to effectively cool the plate material.

In addition, the present invention can improve the cooling effect by using the pinch roll to remove the remaining water remaining on the surface of the plate while allowing the cooling water to be distributed throughout the plate surface.

1 is a schematic process chart showing a production (rolling) process of a thick plate product.
Figure 2 schematically shows the configuration of the plate cooling apparatus according to an embodiment of the present invention.
Figure 3 schematically shows a flow chart for a plate cooling method according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the plate cooling apparatus and the plate cooling method using the same according to an embodiment of the present invention.

As shown in FIG. 2, the plate cooling apparatus 10 according to the exemplary embodiment of the present invention includes a first spray unit 20 and 30, a second spray unit 40 and 50, and a pinch roll 60. do.

Here, the pinch rolls 60 are positioned between the transfer rolls 11, and finely pressurizes the plate S so that the cooling water W C sprayed from the first and / or second injection units is the plate S. In addition to being uniformly distributed in the width direction of), the cooling water W C (hereinafter referred to as the remaining water W R ) retained on the plate S is removed from the plate S.

In one embodiment of the present invention, the first spraying portion 20, 30 and the second spraying portion 40, 50 are members provided for spraying the cooling water (W C ) to the plate (S).

However, in one embodiment of the present invention, for convenience of description, the first injection unit for injecting the cooling water (W C ) to the upper surface of the plate (S) is referred to as the first upper injection portion 20, the plate (S) The first injection portion for injecting the cooling water (W C ) to the lower surface of the) will be referred to as a first lower portion 30.

In one embodiment of the present invention, the first upper injection portion 20 is spaced apart from the upper surface of the upper plate S to the upper portion is installed on the transport path of the plate (S). The first upper injection unit 20 supplies the coolant W C to the unit header 21 and the unit header 21 provided with a plurality of nozzles (not shown) capable of spraying the coolant W C. It consists of a first cooling water supply pipe (22).

Here, approximately 1000 or more nozzles provided in the unit header 21 will be used, in which case the plurality of nozzles are arranged to be aligned in rows spaced apart from each other at predetermined intervals. The plurality of unit headers 21 constituting the first upper injection part 20 are arranged in a row spaced apart from each other at predetermined intervals along the transport path direction of the plate S.

When the first upper injection part 20 is operated, a large amount of cooling water W C is injected from the plurality of unit headers 21 to the upper surface of the plate material S in a jet injection method.

On the other hand, in one embodiment of the present invention, the first lower portion 30 is spaced downward from the lower surface of the plate (S), is installed on the transport path of the plate (S). Here, since the first lower part injection part 30 has the same components and operation methods as the first upper part injection part 20, in an embodiment of the present invention, a detailed description of the first lower part injection part 30 will be given. It will be omitted.

Next, in one embodiment of the present invention, the second jetting part is installed on the transport path at a position adjacent to the first jetting part, and together with or separately from the first jetting part, the cooling water W C is used as the sheet S. It is a member provided to cool the board | plate material S by spraying.

However, in one embodiment of the present invention, for convenience of description, the second injection portion for injecting the cooling water (W C ) to the upper surface of the plate (S) is referred to as a second upper injection portion 40, the plate (S) The second injection portion for injecting the cooling water (W C ) to the lower surface of the) will be referred to as a second lower portion 50.

In one embodiment of the present invention, the second upper injection portion 40 has a spray-type spray structure, it is possible to spray the cooling water (W C ) to the upper surface of the plate (S) in the form of a mist. In addition, similar to the second upper injection part 40, the second lower part injection part 50 also has a spray-type spraying structure, and the cooling water W C may be sprayed to the lower surface of the plate S in the form of a mist. .

Hereinafter, with reference to FIG. 3, a plate cooling method according to an embodiment of the present invention will be described.

First, the plate (S) rolled out of the heating furnace through the rolling roll is moved along the feed roll (11), and cooled while passing through the plate cooling apparatus (10).

At this time, according to the temperature of the plate S passing through the plate cooling apparatus 10, the first injection unit and / or the second injection unit is selectively operated.

For example, when it is determined that strong cooling needs to be applied to the plate S passing through the transport path, as in step S1, the first upper injection part 20 and the first lower part injection part 30 are operated to provide a large amount of the cooling. The cooling water W C may be injected onto the surface of the plate S in a jet spraying manner to cool the plate S.

Simultaneously with the above process, the plate S passing through the plate cooling apparatus 10 is pressurized to a micro pressure by the pinch rolls 60, in which the pinch rolls 60 are the coolant sprayed onto the surface of the plate S. (W C ) to be evenly distributed in the width direction of the plate (S).

For this reason, the plate cooling apparatus 10 according to the embodiment of the present invention allows the cooling water W C to be uniformly distributed throughout the plate S, thereby reducing the shape of the plate S ( S) can be cooled.

On the other hand, as in step S2, when it is determined that weak cooling needs to be applied to the plate S passing through the transfer path, the first upper injection part 20 and the first lower part injection part 30 are not operated. The second upper injection part 40 and the second lower part injection part 50 for spraying the cooling water W C in the spray type may be operated to cool the plate S.

At this time, the second upper injection unit 40 sprays a small amount of cooling water (W C ) to the upper surface of the plate (S) rather than the flow rate of the cooling water sprayed by the first upper injection unit 20 in the spray type. Then, the second lower part sand 50 will spray a small amount of cooling water W C to the lower surface of the plate S rather than the flow rate of the cooling water sprayed by the first lower part sand 30.

In addition, the pinch roll 60 is also operated while the second upper injection part 40 and the second lower part injection part 50 are operated, so that the cooling water W C is uniformly distributed throughout the plate S. To help.

And, as in step S3, when it is determined that the plate S passing through the conveying path needs to be supercooled very strongly, the first upper injection part 20, the first lower part injection part 30, the second The upper injection section 40 and the second lower injection section 50 are operated simultaneously.

Even when the first upper injection part 20, the first lower injection part 30, the second upper injection part 40, and the second lower injection part 50 are all operated, the pinch roll 60 is operated. Thus, the cooling water W C can be uniformly distributed throughout the sheet material S.

And finally, in order to remove the residual water W R remaining on the plate S, the second upper injection part 40 and the second lower part injection part 50 are operated. In this case, the second upper injection part 40 and the second lower part injection part 50 may be operated together with the pinch roll 60 to remove the residual water W R remaining on the surface of the plate S. On the other hand, through the above process, the residual water (W R ) removed from the plate (S) is introduced into the second injection portion (45, 50) can be reused as the cooling water (W C ).

In the sheet cooling method according to an embodiment of the present invention, according to the state of the plate (S), the degree of injection of the cooling water (W C ) is determined (for example, cold, weak, or super cold), the cooling water to the plate (S) By injecting (W C ), the board member S can be cooled efficiently. In addition, it does not waste the cooling water (W C ) required for cooling, it is possible to reduce the production cost of the plate (S).

The exemplary embodiments described above are intended to be illustrative, not limiting, in all aspects of the invention. Accordingly, the invention is capable of many modifications and detail in the art, which may be obtained from the teachings contained herein by those skilled in the art. All such modifications and variations are to be considered within the scope and spirit of the present invention as defined by the following claims.

10: plate cooling device 20: first upper injection part
30: first lower part injection part 40: second upper part injection part
50: second lower part sand 60: pinch roll

Claims (6)

delete delete delete delete A first injector installed on the conveying path of the plate so that the coolant is sprayed onto upper and lower surfaces of the heated plate, and spraying the coolant by a jet spray method; A second injector installed on a conveying path of the plate so that coolant is sprayed onto upper and lower surfaces of the heated plate and spraying a smaller amount of coolant than the first injector in a mist form; And a pinch roll installed in the conveying path of the plate, such that the coolant sprayed from the first or second spray unit is uniformly distributed on the plate and provided to correct the shape of the plate. In the plate cooling method for cooling a plate using a plate cooling device comprising:
According to the plate passing through the conveying path,
A step (S1) in which coolant is injected into the plate by operating the first spraying unit;
The second spraying unit is operated to spray cooling water onto the plate (S2);
Simultaneously operating the first and second spray units (S3); One step is performed according to the amount of cooling,
In the step S1 to step S3, the pinch roll is operated to distribute the cooling water uniformly along the width direction of the plate (S4); plate cooling method performed.
The method of claim 5, wherein
After the step of uniformly distributing the cooling water, further comprising the step (S5) of operating the second injection unit to remove the remaining water formed by cooling the plate and the remaining cooling water stays on the plate. Cooling method.
KR1020100135313A 2010-12-27 2010-12-27 Method using apparatus for cooling a strip KR101316512B1 (en)

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KR1020100135313A KR101316512B1 (en) 2010-12-27 2010-12-27 Method using apparatus for cooling a strip

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Application Number Priority Date Filing Date Title
KR1020100135313A KR101316512B1 (en) 2010-12-27 2010-12-27 Method using apparatus for cooling a strip

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KR20120073521A KR20120073521A (en) 2012-07-05
KR101316512B1 true KR101316512B1 (en) 2013-10-08

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101536906B1 (en) * 2014-05-28 2015-07-16 현대제철 주식회사 Cooling apparatus for material
KR101848168B1 (en) * 2016-11-11 2018-04-12 오창영 Cooling apparatus for heat treatment of metals

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08192218A (en) * 1995-01-17 1996-07-30 Nippon Steel Corp Cooling device for hot rolled steel strip
JPH11347629A (en) * 1998-06-09 1999-12-21 Nkk Corp Straightening and cooling device for high temperature steel plate and its straightening and cooling method
JP2002121616A (en) 2000-10-12 2002-04-26 Nkk Corp Method and device for dewatering high temperature plate to be cooled
KR20080091393A (en) * 2006-03-03 2008-10-10 제이에프이 스틸 가부시키가이샤 Cooling apparatus for hot rolled steel band and method of cooling the steel band

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08192218A (en) * 1995-01-17 1996-07-30 Nippon Steel Corp Cooling device for hot rolled steel strip
JPH11347629A (en) * 1998-06-09 1999-12-21 Nkk Corp Straightening and cooling device for high temperature steel plate and its straightening and cooling method
JP2002121616A (en) 2000-10-12 2002-04-26 Nkk Corp Method and device for dewatering high temperature plate to be cooled
KR20080091393A (en) * 2006-03-03 2008-10-10 제이에프이 스틸 가부시키가이샤 Cooling apparatus for hot rolled steel band and method of cooling the steel band

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