KR101819303B1 - Apparatus for induction heating material and endless rolling method of thesame - Google Patents

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating apparatus and a continuous continuous rolling method including the induction heating apparatus,

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.

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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 total induction heater 40 can be determined using the amount of deviation reduction and the amount of increase in the widthwise temperature deviation due to cooling as a variable.

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 entire induction heater 40 is determined by the initial widthwise temperature deviation DELTA T _ini of the center portion and the edge portion, -1) of the material S in the width direction, and the amount of increase Δ T2 in the width direction in the width direction due to cooling.

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 entire induction heater 40 in the induction heating apparatus of the present invention can be determined by the following equation.

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 entire induction heater 40 so as to form a uniform temperature distribution in the width direction.

Hereinafter, the process of determining the output ratio of the first induction heater 40-1 at the output ratio of the entire induction heater 40 in the induction heating apparatus of the present invention will be described with reference to the following embodiments. .

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 induction heater 40 can be varied. The output ratio of each induction heater 40 provided in the induction heater is calculated so that the output ratio of each induction heater 40 is the same. The induction heater 40-1 and the second induction heater 40-2 will be described.

[Example 1]

In the case where the total induction furnace 40 is 10 units, 3MW per unit, and the efficiency is 60% in the case of H = 100 mm, V = 100 mm / s, W = 1600 mm, L = 20000 mm and ΔT _ini = 150, The amount of heat supplied to the material S through the induction heater 40 of 3000000W * 0.6 = 1800000W.

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 induction furnaces 40. Conversely, the second induction furnace 40-2 (LF system) can have a total of 10 induction furnaces 40, 0 ~ 6 units may be installed.

[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 induction heater 40 of 3000000W * 0.6 = 1800000W.

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 direction temperature gauge 50 for measuring a width direction temperature deviation of the work S is installed in a region where the work S heated by the induction heater 40 is drawn out .

The width direction temperature measuring device 50 can measure the temperature deviation in the width direction of the center portion and the edge portion of the material S drawn out from the induction heater 40 and detects the information measured by the width direction temperature measuring device 50 It is possible to control the output ratios of the first induction heater 40-1 (TF system) and the second induction heater 40-2 (LF system) that heats the material S based on the temperature.

The material S to be measured by the width direction temperature measuring device 50 may be a primary rolled material rolled in a roughing mill 20 or a strip rolled in a finishing mill 30. [

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 induction heater 40 may include a draw-out entrance differential 43 and an induction heating portion 41. [

The induction heating furnace 40 is provided with a draw-out entrance differential 43 which is moved on a conveying rail R provided over the conveying direction of the work S, S and an induction heating part 41 surrounding the area including the upper and lower surfaces of the induction heating part 41 and having one side opened.

The induction heating portion 41 is installed on the draw-out entrance carriage 43 slidably formed on the conveying rail R provided on the support frame F and can be drawn out to the conveying path of the work S.

As shown in Fig. 3, the induction heating apparatus of the present invention can be applied to the continuous continuous rolling apparatus 1.

At this time, the continuous continuous rolling apparatus 1 may include a caster 10, a roughing mill 20, a finishing mill 30, an induction heating apparatus, and a winder 60.

Specifically, the continuous continuous rolling apparatus 1 comprises a continuous casting machine 10 for producing a slab, a rough rolling mill 20 for rolling the slab and reducing the thickness to produce a primary rolled material, A finishing mill 30 for rolling the primary rolled material produced by the roughing mill 20 to reduce the thickness and rolling it into strips, a slab before entering into the roughing step, The induction heating apparatus according to any one of claims 1 to 4, which heats at least one of the rolled materials, and a winder (60) for winding and coiling the strip.

The induction heating apparatus may be installed in at least one of the caster 10 and the roughing mill 20 in the continuous continuous rolling apparatus 1 and between the roughing mill and the finishing mill 30.

The induction heating apparatus can be installed between the performer 10 and the roughing mill 20 and between the roughing mill and the finishing mill 30 in the continuous continuous rolling apparatus 1.

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 machine 10.

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 mill 30, and the first predetermined thickness of the first rolled material is rolled to the second predetermined thickness, have.

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 mill 30 can be wound by a winding machine 60 in the form of a coil in the form of a final product.

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 rolling apparatus 1 having various embodiments described above can be applied.

Therefore, detailed configurations of the induction heating apparatus and the continuous continuous rolling apparatus 1 have already been described, and a detailed description thereof will be omitted in order to avoid redundancy.

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)

delete A first induction heating furnace of a TF (Transverse Flux) type which is installed in a material conveying region for induction heating the conveyed material; And
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.
3. The method of claim 2,
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) .
3. The method of claim 2,
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.
3. The induction heating device according to claim 2,
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 continuous casting step of producing a slab with 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
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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