KR101819303B1 - Apparatus for induction heating material and endless rolling method of thesame - Google Patents
Apparatus for induction heating material and endless rolling method of thesame Download PDFInfo
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- KR101819303B1 KR101819303B1 KR1020150184720A KR20150184720A KR101819303B1 KR 101819303 B1 KR101819303 B1 KR 101819303B1 KR 1020150184720 A KR1020150184720 A KR 1020150184720A KR 20150184720 A KR20150184720 A KR 20150184720A KR 101819303 B1 KR101819303 B1 KR 101819303B1
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- induction
- induction heating
- induction heater
- heater
- width direction
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/02—Winding-up or coiling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1213—Accessories for subsequent treating or working cast stock in situ for heating or insulating strands
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
- H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
- H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor
- H05B6/104—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor metal pieces being elongated like wires or bands
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Metal Rolling (AREA)
- General Induction Heating (AREA)
Abstract
The present invention relates to a TF (Transverse Flux) first induction heating furnace installed in a material conveying region for induction heating a conveyed material; And a second induction heater of LF (Longitudinal Flux) type, which is installed in a transfer area of the material, for induction heating the material to be transferred, and the initial width direction temperature deviation Tini of the center part and the edge part of the material, A total induction heating including the first induction heating and the second induction heating, with the variable amount of the temperature variation in the width direction of the material reduced by the heating of the first induction heater and the amount of increase in the temperature variation in the width direction by cooling, An induction heating apparatus for determining the output ratio of a first induction heater at an output ratio of a heater.
Description
The present invention relates to an induction heating apparatus capable of reducing a temperature variation in the width direction of a material and an open continuous rolling method including the induction heating apparatus.
It should be noted that the contents described in this section merely provide background information on the present invention and do not constitute the prior art.
Securing the rolling temperature for continuous continuous rolling in the casting direct rolling process is a very important factor.
Currently, many steelworks use a tunnel furnace and an induction heater to heat the material.
In the tunnel, gas is burned to secure the temperature of the material through the temperature of the heated air.
In addition, a magnetic field is applied to the induction heating element which occupies a relatively small space compared with the tunnel furnace, and the material is heated by the heat generated by the applied eddy current.
In order to ensure the temperature of the material before rolling, the material can be heated by induction heating before rough rolling and finishing.
Induction heating using induction heating has a method using a vertical flux induction coil and an induction heating method using a longitudinal flux induction coil.
FIG. 1 shows an induction heater using an LF (Longitudinal Flux) heating coil, and FIG. 2 shows an induction heater using a heating coil of a TF (Transverse Flux) Hereinafter referred to as " TF scheme ").
As shown in FIG. 1 (a), the induction heater H1 of the LF type forms a magnetic flux (magnetic field) in a horizontal direction on the surface of the workpiece to heat the workpiece.
As shown in FIG. 1 (b), the induction heater H1 of the LF type operates in a horizontal direction to the metal plate, so the direction of the lower eddy current is different in the thickness direction of the material There is a problem that it is offset at the center portion.
As shown in FIG. 2 (a), the induction heater H2 of the TF type forms a magnetic flux (magnetic field) in a direction perpendicular to the surface of the workpiece to heat the workpiece.
As shown in FIG. 2 (b), the induction heater H2 of the TF type induces a perpendicular magnetic flux (magnetic field) of the material to induce an eddy current in a wide transverse section, Also, the thinner the thickness of the metal plate, the more the eddy currents flowing in the upper and lower portions of the metal plate overlap each other to increase the current density, so that the heating efficiency can be increased.
However, as shown in Fig. 2 (c), there is a problem that the edge portion of the work can be heated.
Accordingly, there is a pressing need to develop an induction heating apparatus capable of uniformly distributing the temperature distribution in the width direction of the material by solving the above problems comprehensively.
The present invention provides an induction heating device capable of reducing the temperature variation in the width direction of a material by obtaining the advantages of the induction heating of the TF system and the induction heating of the LF system so that the material can secure a uniform temperature in the width direction do.
According to an aspect of the present invention, there is provided a method of manufacturing a semiconductor device, including: a first induction heater of a TF (Transverse Flux) type installed in a material transfer region for induction heating a transferred material; And a second induction heater of LF (Longitudinal Flux) type, which is installed in a transfer area of the material, for induction heating the material to be transferred, and the initial width direction temperature deviation Tini of the center part and the edge part of the material, A total induction heating including the first induction heating and the second induction heating, with the variable amount of the temperature variation in the width direction of the material reduced by the heating of the first induction heater and the amount of increase in the temperature variation in the width direction by cooling, An induction heating apparatus for determining the output ratio of a first induction heater at an output ratio of a heater.
delete
Preferably, the output ratio of the first induction heater at the output ratio of the total induction heater can be determined by the following equation.
Here, P TF Is the amount of heat which the first induction is added to the material by the opening (TF method), △ T i ni is the initial width direction temperature deviation, H is the thickness (mm) of the material, W is the material width (mm) V is the material speed (mm / sec), L is the induction heating section length (mm), and k is the exothermic multiples of the edge portions of the first induction heating furnace (TF method) .
Preferably, a width direction temperature measuring device for measuring a temperature variation in the width direction of the workpiece may be installed in a region where the workpiece heated by induction heating is drawn out.
Preferably, the induction heating is a draw-out energizing line which is moved on a conveying rail installed over a conveying direction of the material; And an induction heating unit installed on the draw-out entrance carriage and surrounding the area including the upper and lower surfaces of the work to be conveyed and having one side opened.
According to another aspect of the present invention, there is provided a continuous casting machine comprising: a continuous casting step of producing a slab by a continuous casting machine; A rough rolling step of rolling the slab produced in the continuous casting step to a first predetermined thickness to produce a first rolled material; A finish rolling step of rolling the first rolled material produced in the rough rolling step to reduce the thickness and rolling the first rolled material to a second predetermined thickness to produce a strip; And an induction heating step in which the induction heating apparatus heats at least one of a slab before entering into the rough rolling step and a first rolled material before entering into the finishing rolling step and a winding step of winding and stripping the strip To provide a continuous continuous rolling process.
According to an embodiment of the present invention as described above, the advantages of the induction heating of the TF type and the induction heating of the LF type are combined to reduce the temperature variation in the width direction of the material, There is an effect that one temperature can secure.
Fig. 1 is a diagram showing the induction heating of the closed type LF system.
Fig. 2 is a diagram showing the induction heating of the TF system.
3 is a view showing an open continuous rolling apparatus equipped with the induction heating apparatus of the present invention.
4 is a view showing a first induction heating furnace and a second induction heating furnace according to the present invention.
Fig. 5 is a view showing a state in which the induction heating furnace of the present invention is drawn in and out on a feed path of a work.
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for clarity.
Hereinafter, an induction heating apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.
3 and 4, an induction heating apparatus according to an embodiment of the present invention includes a first induction heater 40-1 and at least a first induction heater 40-2 of the second induction heater 40-2. (40-1), and may further include a lateral temperature gauge (50).
3, the induction heating apparatus includes a TF type first induction heater 40-1 installed in a conveying region of a material S for induction-heating a conveyed material S, S and at least a first induction heater 40-1 among the LF type second induction heater 40-2 for induction heating the material S to be fed.
The induction heating apparatus has an initial widthwise temperature deviation T ini of the center portion and an edge portion of the work S and a widthwise temperature of the work S by heating the first induction heater 40-1 The output ratio of the first induction heater 40-1 at the output ratio of the
As shown in FIG. 3, the first induction heater 40-1 and the second induction heater 40-2 may be installed together.
A plurality of induction heater (s) 40 may be installed in the conveying path of the work S to continuously heat the work S to be conveyed.
However, at least one first induction heater 40-1 may be installed, and a second induction heater 40-2 may not be installed.
The output ratio of the first induction heater 40-1 at the output ratio of the
The initial widthwise temperature deviation DELTA T ini and the widthwise temperature variation decrease DELTA T1 of the material S due to the heating of the first induction heater 40-1 and the cooling of the material S The material S can have a uniform temperature distribution in the width direction when the value obtained by adding the width direction temperature variation increase amount?
As shown in Fig. 1 (c), the first induction heater 40-1 of the LF type has a lower temperature in the edge portion which is the end portion in the width direction of the work S, as compared with the center portion.
As shown in FIG. 2C, the first induction heater 40-1 of the TF type has a relatively high heating value at the edge portion, which is the end portion in the width direction of the work S, Is increased.
Therefore, when the temperature of the edge of the material S is lowered, the output of the TF type first induction heater 40-1 is increased and the output of the LF type second induction heater 40-2 It is necessary to reduce the output.
Conversely, when overheating occurs at the edge of the material S, the output of the first induction heater 40-1 of the TF system is reduced and the output of the second induction heater 40-2 of the LF system It is necessary to increase the output.
In the case of the specialized steel (containing Nb and Ti), the edge portion of the material S can be intentionally overheated. This is because in the case of specialized steel including niobium (Nb) and titanium (Ti) So that the edge portion can be prevented from being broken.
The initial width direction temperature deviation T ini of the center portion and the edge portion of the work S and the amount of decrease in the widthwise temperature deviation of the work S due to the heating of the first induction heater 40-1, Can be determined by the following equation with the variable amount of increase in the temperature in the width direction by the variable as a variable.
The output ratio of the first induction heater 40-1 at the output ratio of the
Here, P TF ΔT ini is the initial widthwise temperature deviation of the material S and H is the amount of heat of the material S by the first induction heater 40-1 (TF method) W is the width (mm) of the material S, V is the speed of the material S (mm / sec), L is the induction heating section length (mm), k is the thickness (The amount of heat generated at the edge portion / the amount of heat generated at the center portion) of the edge portion of the heater 40-1 (TF method).
The material S can control the output ratio of the first induction heater 40-1 at the output ratio of the
Hereinafter, the process of determining the output ratio of the first induction heater 40-1 at the output ratio of the
Here, P TF ΔT ini is the initial widthwise temperature deviation of the material S and H is the amount of heat of the material S by the first induction heater 40-1 (TF method) W is the width (mm) of the material S, V is the speed of the material S (mm / sec), L is the induction heating section length (mm), k is the thickness (The amount of heat generated at the edge portion / the amount of heat generated at the center portion) of the edge portion of the heater 40-1 (TF method).
However, the exothermic drainage k of the edge portion of the first induction heater 40-1 varies depending on the design of the induction heating apparatus. In the following embodiment, k = 2 to 5 .
The ratio of the output of the
[Example 1]
In the case where the
It is assumed that k is in the range of 2 to 5, and the value of P TF is calculated according to the above equation.
5680000 (when k = 5)? P TF ? 19312000 (when k = 2)
Accordingly, the installation number N TF of the first induction heater 40-1 is in the range of 3.2? N TF ? 10.7 based on P TF / 1800000, and the first induction heater 40-1 TF system) can be installed in four to ten units out of the total of 10
[Example 2]
(20), 3MW per unit, and 60% efficiency in the case of H = 20 mm, V = 500 mm / s, W = 1600 mm, L = 15000 mm and ΔT ini = 150, The amount of heat supplied to the material S through the
It is assumed that k is in the range of 2 to 5, and the value of P TF is calculated according to the above equation.
4039500 (when k = 5)? P TF ? 13734300 (when k = 2)
Accordingly, the installation induction number N TF of the first induction heater 40-1 is in the range of 2.2? N TF ? 7.6 in terms of P TF / 1800000, and the first induction heater 40-1 TF method) can be installed in a total of 20 induction furnaces (40), and the second induction furnace (40-2) (LF type) can be provided with a total of 10 induction furnaces (40) 12 to 17 units may be installed.
3, a width
The width direction
The material S to be measured by the width direction
4 (a) is a view showing a first induction heater 40-1 of the induction heating apparatus according to the present invention, and FIG. 4 (b) is a view showing a second induction heater 40-2.
4, the first induction heater 40-1 and the second induction heater 40-2 of the induction heating apparatus of the present invention are configured to surround the upper and lower surfaces of the work, So that one side can be configured to be opened so that it can be drawn in and out on the conveying path of the material.
As shown in Fig. 5, the
The
The
As shown in Fig. 3, the induction heating apparatus of the present invention can be applied to the continuous continuous
At this time, the continuous continuous
Specifically, the continuous continuous
The induction heating apparatus may be installed in at least one of the
The induction heating apparatus can be installed between the
Next, the continuous continuous rolling method will be described in detail with reference to FIG.
Referring to FIG. 3, the continuous continuous rolling method according to an embodiment of the present invention may include a continuous casting step, a rough rolling step, a finishing rolling step, an induction heating step, and a winding step.
The continuous continuous rolling method includes a continuous casting step of producing a slab by a continuous casting machine, a rough rolling step of rolling the slab produced in the continuous casting step to a first predetermined thickness to produce a first rolled material, Rolling the produced first rolled material to reduce the thickness of the rolled first rolled material to a second predetermined thickness to produce a strip; and a step in which the induction heating device feeds the slab before entering the rough rolling step, An induction heating step of heating at least one of the preceding first rolled materials, and a winding step of winding and coiling the strip.
In the continuous casting step, the slab can be cast using continuous casting segments formed in the casting
In the rough rolling step, the continuously cast slab can be rolled to a first predetermined thickness through the roughing mill 20 to produce the first rolled material.
At this time, an induction furnace (40) is installed in front of the roughing mill (20) so that the slab can be introduced into the roughing mill (20) in a state of induction heating.
In the finishing rolling step, the first rolled material rolled primarily in the roughing mill 20 is rolled by the finishing
At this time, an induction furnace (40) is installed in front of the finishing mill (30) so that the first rolling material can be introduced into the finishing mill (30) while being inductively heated.
In the winding step, the strip rolled in the finishing
It is needless to say that in the continuous continuous rolling method of the present invention, various embodiments of the induction heating apparatus and the continuous continuous
Therefore, detailed configurations of the induction heating apparatus and the continuous continuous
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. And will be apparent to those skilled in the art.
1: continuous continuous rolling device 10:
20: rough rolling mill 30: finishing mill
40: induction heater 40-1: first induction heater
40-2: second induction heating element 41: induction heating element
43: draw-out entrance door 50: width direction temperature measuring instrument
60: take-up machine F: support frame
R: Feed rail S: Material
DELTA T1: reduction in temperature variation in the width direction of the material due to heating of the first induction heater
? T2: Increase in temperature variation in the width direction due to cooling of the workpiece
H1: LF method induction heating H2: TF method induction heating
Claims (6)
And a second induction heating furnace of LF (Longitudinal Flux) type, which is installed in the material transfer region to induction-heat the material to be transferred,
The temperature difference in the initial width direction of the center portion and the edge portion of the workpiece (Tini), the amount of decrease in the temperature variation in the width direction of the workpiece due to the heating of the first induction heater, Wherein the output ratio of the first induction heater at the output ratio of the total induction heater including the first induction heater and the second induction heater is determined.
Wherein an output ratio of the first induction heater is determined at an output ratio of the total induction heater by the following equation.
Here, P TF Is the amount of heat which the first induction is added to the material by the opening (TF method), △ T i ni is the initial width direction temperature deviation, H is the thickness (mm) of the material, W is the material width (mm) V is the material speed (mm / sec), L is the induction heating section length (mm), and k is the exothermic multiples of the edge portions of the first induction heating furnace (TF method) .
Wherein a width direction temperature measuring device for measuring a widthwise temperature deviation of the workpiece is installed in a region where the workpiece heated by the induction heater is drawn out.
A take-out energizing plate moved on a conveying rail installed over the conveying direction of the material; And
And an induction heating unit installed on the drawout entrance carriage and surrounding the area including the upper and lower surfaces of the work to be conveyed and having one side opened.
A rough rolling step of rolling the slab produced in the continuous casting step to a first predetermined thickness to produce a first rolled material;
A finish rolling step of rolling the first rolled material produced in the rough rolling step to reduce the thickness and rolling the first rolled material to a second predetermined thickness to produce a strip; And
The induction heating apparatus according to any one of claims 2 to 5, further comprising: an induction heating step of heating at least one of a slab before entering the rough rolling step and a first rolled material before entering into the finishing rolling step; And
And a winding step of winding the strip and coiling the strip.
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KR1020150184720A KR101819303B1 (en) | 2015-12-23 | 2015-12-23 | Apparatus for induction heating material and endless rolling method of thesame |
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KR102178713B1 (en) * | 2018-10-26 | 2020-11-13 | 주식회사 포스코 | Heating apparatus for material and continuous casting apparatus |
CN111702010B (en) * | 2020-06-23 | 2022-03-11 | 中冶赛迪工程技术股份有限公司 | Production process of thin strip by continuous casting and rolling |
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