KR101867716B1 - Cooling apparatus, heat treatment apparatus using same, and heat treatment method - Google Patents

Cooling apparatus, heat treatment apparatus using same, and heat treatment method Download PDF

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Publication number
KR101867716B1
KR101867716B1 KR1020160169318A KR20160169318A KR101867716B1 KR 101867716 B1 KR101867716 B1 KR 101867716B1 KR 1020160169318 A KR1020160169318 A KR 1020160169318A KR 20160169318 A KR20160169318 A KR 20160169318A KR 101867716 B1 KR101867716 B1 KR 101867716B1
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KR
South Korea
Prior art keywords
refrigerant
cooling
container
heat treatment
vessel
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Application number
KR1020160169318A
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Korean (ko)
Inventor
한인석
황재훈
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주식회사 포스코
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Priority to KR1020160169318A priority Critical patent/KR101867716B1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/58—Oils
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/63—Quenching devices for bath quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0012—Rolls; Roll arrangements
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

The present invention relates to a cooling apparatus, and a heat treatment apparatus and a heat treatment method using the same. The apparatus comprises: a container storing a first refrigerant, having an entrance hole through which a material can be introduced provided at one side of the container and an exit hole through which the material can be discharged provided at the other side thereof, and allowing the material to be immersed in the first refrigerant; and a heat exchanging unit which is installed in the container, and through which a second refrigerant can pass to cool the first refrigerant. Therefore, boiling can be removed so as to prevent damage to facilities. Moreover, the refrigerant is not pure water so that oxidation of the material can be suppressed to increase a surface quality of a product.

Description

TECHNICAL FIELD [0001] The present invention relates to a cooling apparatus, a heat treatment apparatus and a heat treatment method using the same,

The present invention relates to a cooling device for reducing cost by preventing pure water from being used, preventing damage to facilities by eliminating boiling phenomenon, suppressing oxidation on the surface of the material and improving the quality of the product, And a method of heat treatment.

For example, a cold-rolled steel sheet is subjected to a heat treatment such as annealing because its internal stress is increased and workability is lowered. There are batch type and continuous type of heat treatment method.

Fig. 1 shows a cooling zone according to the prior art and shows an example used for a continuous type heat treatment.

The steel sheet is heated and then cooled to secure necessary properties and cooled to room temperature. The steel sheet is slowly cooled in a reducing atmosphere to about 150 ° C, and then cooled to about 50 ° C in the cooling zone as shown.

In such a conventional cooling table, cooling water (W) is contained in the container (10) for cooling the material (1) such as a steel sheet. As the cooling water, pure water is used to prevent impurities from being caught between the immersion roll 11 and the material in the container.

However, since the pure water must be used in this way, the cost is increased, shock waves due to the boiling phenomenon are generated on the surface of the material such as the steel sheet, and the cooling water directly contacts the material. There is a problem that the quality is deteriorated.

(Patent Document 1) KR 0657560 B1

Accordingly, the present invention provides a cooling device capable of reducing cost, preventing damage to equipment by eliminating boiling phenomenon, suppressing oxidation on the surface of the material and improving the quality of the product by using pure water, There is a main purpose in providing a heat treatment apparatus.

The cooling device according to the present invention is characterized in that the cooling device is closed by a lid and accommodates the first refrigerant and has an inlet through which material can enter from one side and an outlet from which the material can flow out from the other side, A container which is immersed in refrigerant; And a heat exchange unit installed in the container and passing the second refrigerant to cool the first refrigerant, wherein the first refrigerant is oil, and the container is provided with a gas supply port for supplying an inert gas for purging .

delete

Further, a heat treatment apparatus according to the present invention includes: a heating device for heating a material; And a cooling device disposed downstream of the heating device.

According to another aspect of the present invention, there is provided a heat treatment method comprising: heating a material; And cooling the heated workpiece, wherein the cooling step includes: purging the vessel filled with the first refrigerant with an inert gas; Immersing the material in a first coolant; And cooling the first refrigerant through heat exchange with a second refrigerant, wherein the first refrigerant is oil, and when the material is immersed in the first refrigerant, 1 refrigerant is 10 占 폚 higher than the boiling point of the refrigerant.

As described above, according to the present invention, the boiling phenomenon of the first refrigerant can be eliminated, damage to the equipment can be prevented, and since the first refrigerant is not water such as pure water, It is possible to obtain an effect that can be improved.

In addition, according to the present invention, pure water is not used as the first refrigerant, and the first refrigerant can be cooled by the general cooling water instead of pure water, so that it is not necessary to supply the pure water.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a cooling zone according to the prior art; Fig.
2 is a view showing a cooling device according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 is a view showing a cooling device according to an embodiment of the present invention. As shown in the figure, the cooling device according to the embodiment of the present invention includes a first refrigerant (C1), an inlet (12) through which the material (1) can enter at one side, A container (10) provided with an outlet (13) through which material can be immersed in the first refrigerant; And a heat exchange unit (20) installed in the container for cooling the first refrigerant through the second refrigerant (C2).

Further, the heat treatment apparatus according to the present invention comprises a heating device (not shown) for heating the material 1; And a cooling device disposed downstream of the heating device and shown and described herein.

Further, a heat treatment method according to the present invention includes the steps of: heating a material (1); And cooling the heated workpiece, wherein the cooling step comprises: immersing the workpiece in a first coolant (C1); And cooling the first refrigerant through heat exchange with the second refrigerant (C2).

Hereinafter, the cooling device according to the embodiment of the present invention will be described and illustrated with reference to the case where the cooling device is used for the continuous type heat treatment. However, the cooling device of the present invention is not necessarily limited to this example , And may be changed within the scope of the technical idea of the present invention.

For example, in the continuous type heat treatment, a material 1 such as a steel sheet is heated in a heating device and then cooled to secure necessary physical properties and cooled to room temperature. The material 1 is slowly cooled in a reducing atmosphere to about 150 ° C, It is possible to cool to about 50 캜 in the cooling apparatus shown in Fig.

The container 10 of the cooling device according to the embodiment of the present invention can be closed by a cover (not shown) which can be opened for maintenance or the like, as a substantially box-shaped tank whose upper surface is closed.

At one side of the container 10, there is provided an inlet 12 through which a material 1 such as a steel sheet can be inserted, and an outlet 13 through which material can escape from the other side. These inlets and outlets may be provided with sealing rolls 14 for sealing the inflow of reducing gas or oxygen, respectively, while at the same time preventing the outflow of gas in the container.

Also, at least one dipping roll 11 may be installed in the container 10 according to an embodiment of the present invention. Such an immersion roll may be immersed in the first refrigerant C1 to support the material 1 or change the traveling direction of the material.

As the first refrigerant (C1), mineral oils such as light oil and kerosene, and oils such as synthetic oil may be employed. These oils may be used alone or in combination.

For example, when the first refrigerant (C1) is light oil, since the boiling point of light oil is 220 ° C or higher (approximately 250-350 ° C), the material slowly cooled to approximately 150 ° C during the above- , The material 1 is immersed in light oil and cooled, so that no boiling phenomenon occurs. Thereby, there is no shock wave derived from the boiling phenomenon, so that damage to the equipment, particularly the vessel 10, caused by shock waves can be prevented.

When the material (1) is immersed in the first refrigerant (C1), the maximum allowable temperature of the material may be about 10 ° C higher than the boiling point of the first refrigerant. Preferably, the temperature of the workpiece to be cooled is lower than the boiling point of the first refrigerant.

If the first refrigerant C1 has a little volatility, it may help to clean the material in a subsequent process. However, since the volatility is higher, the first refrigerant C1 is easier to explode, so that the first refrigerant is preferably a volatile oil having low volatility.

On the other hand, when the first refrigerant (C1) is light oil, since its flash point is approximately 50 to 70 ° C, flame or explosion may occur due to a material having approximately 150 ° C. In order to prevent such a flame or an explosion, it is necessary to fill the remaining empty space outside the space filled with the first refrigerant of the vessel 10 with an inert gas such as nitrogen or argon, And the gas supply port 15 may be connected to a gas supply source (not shown) via a pipe 15a, a pump 15b, a valve 15c, or the like.

Since the first refrigerant C1 made of oil has a specific heat and thermal conductivity lower than that of water, the cooling capacity may be insufficient. Therefore, in the vessel 10, the first refrigerant C1 ' A jet nozzle 16 for jetting the jetted jet can be additionally provided. These injection nozzles can also be connected to a separate first refrigerant supply source (not shown) via a pipe 16a, a pump 16b, a valve 16c, and the like. At this time, it is preferable that the temperature of the first refrigerant (C1 ') supplied for jetting is lower than that of the first refrigerant (C1) contained in the vessel.

The heat exchanging part 20 is provided in the vessel 10 with a passage through which the second refrigerant C2 passes. By providing the heat exchanging portion, it is possible to cool the first refrigerant (C1), which is gradually heated by the material (1), to be kept much lower than the temperature of the material, thereby improving the cooling efficiency of the first refrigerant. Particularly, by cooling the first refrigerant by the heat exchanging part, the boiling phenomenon can be eliminated to some extent.

Here, as the second refrigerant C2, water such as seawater, clear water, tap water or the like is used instead of pure water, and the cost can be reduced.

As shown in FIG. 2, the heat exchanging unit 20 may be disposed in the form of a cooling pipe 21 through which the second refrigerant C2 passes or a hollow cooling plate protruding into the interior of the container 10, But may be arranged in the form of, for example, a cooling jacket embedded in the wall of the container and formed with a passage of the second refrigerant.

Water which is the second refrigerant C2 used in the heat exchanging part 20 is supplied from a cooling water source (not shown), passes through the heat exchanging part, is absorbed from the first refrigerant C1, and can be discarded. Alternatively, the water as the second refrigerant is supplied from a separate cooling unit (not shown) provided with a blower for blowing cold air, etc., passes through the heat exchange unit, absorbs heat from the first refrigerant, .

Alternatively, the container 10 may be divided into a plurality of compartments 10a and 10b as shown in the drawings, but is not limited thereto. Further, when the refrigerant is divided into the plurality of compartments, the temperature of the first refrigerant contained in each of the compartments and the temperature of the second refrigerant for cooling the first refrigerant can be maintained differently.

More specifically, the first refrigerant (C1) in the upstream side partition (10a) in the vessel (10) can be maintained at a higher temperature than the first refrigerant (C1) in the downstream side partition (10b) The temperature of the second refrigerant C2 passing through the heat exchange unit 20 provided in the side partition may be higher than the temperature of the second refrigerant passing through the heat exchange unit provided in the downstream side partition. Of course, the temperatures of the second refrigerant on the upstream side and the second refrigerant on the downstream side may be the same.

As described above, according to the present invention, pure water is not used in the cooling apparatus, and disadvantages caused by using pure water as in the conventional art can be solved. In other words, it is possible to reduce the cost by not using pure water, to prevent the damage of the equipment by eliminating the boiling phenomenon, to suppress the oxidation on the surface of the material, and to improve the quality of the product.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present specification and drawings are intended to illustrate rather than limit the technical spirit of the present invention, and the scope of technical spirit of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

1: material 10: container
11: immersion roll 12: inlet
13: outlet 14: sealing roll
15: gas supply port 16: injection nozzle
20: heat exchanger 21: cooling pipe
C1: first refrigerant C2: second refrigerant

Claims (18)

A container which is closed by the cover and accommodates the first refrigerant and has an inlet through which the material can be introduced at one side and an outlet through which the material can flow out at the other side; And
A heat exchange unit installed in the vessel for passing the second refrigerant to cool the first refrigerant,
/ RTI >
The first refrigerant is an oil,
Wherein the container is provided with a gas supply port for supplying an inert gas for purging.
The method according to claim 1,
And a sealing roll for sealing is provided at the inlet and the outlet.
delete The method according to claim 1,
And a jet nozzle for jetting the jet toward the material is provided in the container.
5. The method of claim 4,
And the jet is a first refrigerant.
The method according to claim 1,
And the heat exchanging part protrudes into the interior of the container.
The method according to claim 1,
And the heat exchanger is disposed in the wall of the vessel.
The method according to claim 1,
And the second refrigerant is water.
9. The method of claim 8,
Wherein the first refrigerant is one or a combination of kerosene, light oil, and synthetic oil.
A heating device for heating the material; And
The cooling device according to any one of claims 1, 2, 4 to 9,
/ RTI >
Heating the material; And
Cooling the heated material
Lt; / RTI >
Wherein the cooling step comprises:
Filling the container containing the first refrigerant with an inert gas and purging the container;
Immersing the material in a first coolant; And
Cooling the first refrigerant through heat exchange with the second refrigerant
/ RTI >
The first refrigerant is an oil,
Wherein the maximum allowable temperature of the material is 10 ° C higher than the boiling point of the first refrigerant when the material is immersed in the first refrigerant.
12. The method of claim 11,
Wherein the cooling step comprises sealing the container containing the first refrigerant.
delete 13. The method of claim 12,
Wherein the second refrigerant is circulated between the vessel and a separate cooling section.
12. The method of claim 11,
Wherein said cooling includes jetting a jet stream in the vessel toward the workpiece.
delete 12. The method of claim 11,
Wherein when the material is immersed in the first refrigerant, the temperature of the material is lower than the boiling point of the first refrigerant.
delete
KR1020160169318A 2016-12-13 2016-12-13 Cooling apparatus, heat treatment apparatus using same, and heat treatment method KR101867716B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0234727A (en) * 1988-07-22 1990-02-05 Kawasaki Steel Corp Method and device for cooling metallic strip
JP2007051332A (en) * 2005-08-18 2007-03-01 Koyo Thermo System Kk Hardening device, and method for recovering exhaust heat of coolant
KR101699234B1 (en) * 2015-11-20 2017-01-24 주식회사 포스코 Device and method for cooling strip in continuous annealing furnace

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0234727A (en) * 1988-07-22 1990-02-05 Kawasaki Steel Corp Method and device for cooling metallic strip
JP2007051332A (en) * 2005-08-18 2007-03-01 Koyo Thermo System Kk Hardening device, and method for recovering exhaust heat of coolant
KR101699234B1 (en) * 2015-11-20 2017-01-24 주식회사 포스코 Device and method for cooling strip in continuous annealing furnace

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