KR101858842B1 - Reducing unit for temperature difference in steel plate and shape correcting apparatus for steel plate - Google Patents

Abstract

According to one embodiment of the present invention, provided is a temperature difference reducing unit. The temperature difference reducing unit comprises: a roll member disposed on a movement route of a steel plate; and a heating member closely coming in contact with the roll member to heat the steel plate and supplying large amounts of heat to an energy unit of the steel plate. Moreover, the steel plate correcting apparatus of the present invention may comprise: the temperature difference reducing unit; and a pressurizing roll unit disposed in downstream of the temperature difference reducing unit in the movement direction of the steel plate and closely coming in contact with the steel plate passing through the temperature difference reducing unit to apply pressure.

Description

Technical Field [0001] The present invention relates to a temperature deviation reducing unit and a steel plate correcting apparatus including the same,

The present invention relates to a temperature deviation reducing unit and a steel plate calibrating apparatus including the same.

In the process of producing the post-steel sheet, the slab is heated and rolled, and subjected to accelerated cooling.

During the manufacturing process, the slab or the steel sheet is exposed to air, and the temperature of the slab or the steel sheet is cooled during the course of the process. At this time, by cooling the steel sheet by heat transfer through the edge portions such as the front- There is a problem that when the temperature is measured in the width direction of the steel sheet, the edge portion of the steel sheet is formed at a lower temperature than the center portion.

It can be confirmed from the temperature distribution in Fig. 1A that the temperature T of the widthwise edge portion Se of the steel sheet is lower than the temperature T of the central portion Sc.

Further, if the hot calibration is performed after the temperature distribution is formed, there arises a further problem that plate deformation occurs during the subsequent accelerated cooling or normal temperature cooling process.

That is, as shown in FIG. 1B, if the calibration is performed after the temperature deviation in the width direction of the steel sheet is formed, the yield stress of the steel sheet If the cooling is performed after the unbalance of the yield stress, plate deformation of the steel sheet occurs.

Therefore, in order to solve the above-described problems, researches on a temperature deviation reduction unit and a steel plate correcting apparatus including the same are needed.

Korean Application No. 10-2013-0033255

SUMMARY OF THE INVENTION An object of the present invention is to provide a temperature deviation reducing unit for forming a uniform temperature distribution in the width direction of a steel sheet before correction of the shape of the steel sheet, reducing the deformation of the steel sheet after calibration, and a steel plate correcting apparatus including the same.

The temperature deviation reducing unit according to an embodiment of the present invention includes a roll member provided on a movement path of a steel sheet and a heating member provided adjacent to the roll member to heat the steel sheet and to supply heat input to the edge portion of the steel sheet Member.

Further, the heating member of the temperature variation reducing unit according to an embodiment of the present invention is provided on the bottom surface of the edge of the steel sheet, and is provided with a triangular or trapezoidal shape, And a coil wound around the core plate to induction-heat the steel plate.

Further, the core plate of the temperature variation reducing unit according to an embodiment of the present invention may be characterized in that a triangular or trapezoidal inclined surface on which the coil is wound is formed in a plurality of stepped shapes.

Further, the core plate of the temperature variation reducing unit according to an embodiment of the present invention may have a plurality of protruding protrusions formed at the ends of the stepped shapes to prevent the coil from escaping.

Further, the coil of the temperature deviation reducing unit according to an embodiment of the present invention may be provided by being wound in one pass with respect to the entire core plate.

The coil of the temperature deviation reducing unit according to an embodiment of the present invention is characterized in that the core plate is divided into a plurality of regions in the width direction of the steel plate and a current is separately applied to the core plate portions of the respective regions, Can be separately wound.

Further, the roll member of the temperature deviation reducing unit according to an embodiment of the present invention includes a lower roll portion provided with a lower surface of the steel plate so as to be in contact with the steel plate and to be moved in contact with the upper surface of the steel plate, And an upper roll portion provided to move up and down depending on the thickness.

The heating member of the temperature deviation reducing unit according to an embodiment of the present invention includes a lower heating portion provided between a plurality of the lower roll portions and an upper heating portion fixedly coupled to an upper shaft of the upper roll portion moving up and down can do.

Further, the upper roll portion of the temperature deviation reducing unit according to an embodiment of the present invention is rotatably coupled to the upper shaft, and the upper portion is provided upstream of the heating portion in the moving direction of the steel sheet, And may include a tangential upper roll.

The upper roll portion of the temperature deviation reducing unit according to an embodiment of the present invention may further include a support bar fixed to the ground and having a guide hole into which the both ends of the upper shaft are inserted in a longitudinal direction, Wherein the upper cylinder includes a driving cylinder coupled to the upper shaft, the driving cylinder moves the upper shaft by a distance corresponding to the upper surface of the upper roll, And the distance from the upper surface of the steel sheet is always kept constant.

The temperature deviation reducing unit according to an embodiment of the present invention may include a moving member to which the heating member is coupled and moves the heating member in the width direction of the steel plate.

According to another aspect of the present invention, there is provided a steel plate correcting apparatus, which is provided downstream of the temperature deviation reducing unit and the temperature deviation reducing unit in the moving direction of the steel plate and is in close contact with a steel plate passed through the temperature deviation reducing unit, And a press roll unit for imparting the press roll.

The temperature deviation reducing unit of the present invention and the steel plate correcting apparatus including the same can have an effect of forming a uniform temperature distribution in the width direction of the steel sheet before the steel sheet is calibrated to reduce the deformation of the steel sheet after calibration.

In other words, it is possible to uniformly change the temperature at the edge portion of the steel sheet so that the temperature in the width direction of the steel sheet becomes uniform before the steel sheet is calibrated, thereby preventing the steel sheet from being deformed during cooling after calibrating by removing residual stress .

In addition, the present invention has an advantage that it is possible to provide the heating member at a constant interval from the steel plate regardless of the thickness of the steel plate, and it is possible to have an effect of accurately correcting the heat input to the steel plate.

It should be understood, however, that the various and advantageous advantages and effects of the present invention are not limited to those described above, and may be more readily understood in the course of describing a specific embodiment of the present invention.

FIGS. 1A and 1B are views showing a nonuniform temperature distribution of a conventional steel sheet and a steel sheet shape deformation thereof.
2 is a side view showing a temperature deviation reducing unit and a steel plate calibrating apparatus including the same according to the present invention.
3 is a front view showing the temperature deviation reducing unit of the present invention.
4 is a plan view showing the temperature deviation reducing unit of the present invention.
5 is a plan view showing a heating member in the temperature deviation reducing unit of the present invention.
6 is a plan view showing a modification of the core plate in the heating member of the temperature variation reducing unit of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

The present invention relates to a temperature deviation reducing unit (100) and a steel plate correcting apparatus including the same, wherein a uniform temperature distribution in the width direction of the steel sheet (S) is formed before the shape correction of the steel sheet (S) The deformation can be reduced.

In other words, by uniformizing the temperature rapidly changing at the edge portion Se of the steel sheet S and uniforming the temperature in the width direction of the steel sheet S before the calibration of the steel sheet S, It is also possible to prevent the steel plate S from being deformed at the time of welding.

2 is a side view illustrating a temperature deviation reducing unit 100 and a steel plate correcting apparatus including the same according to the present invention. The temperature deviation reducing unit 100 according to an embodiment of the present invention includes: A roll member 110 provided on the movement path of the steel sheet S and a steel member S provided adjacent to the roll member 110 to heat the steel sheet S, And a heating member 140 for supplying a large amount of heat input.

In other words, when the steel sheet S is cooled in the air during the calibrating operation, the temperature drop at the edge portion Se becomes larger than the center portion Sc of the steel sheet S, In order to adjust the non-uniform temperature distribution in the width direction, the heating member 140 is provided.

Here, the roll member 110 is provided on a path through which the steel sheet S moves, and supports the steel sheet S to support and move the steel sheet S.

The heating member 140 is provided between a plurality of the roll members 110 in order to make the temperature distribution of the steel sheet S in the width direction uniform.

In addition to heating the edge Se of the steel sheet S, the heating member 140 may increase the amount of heat input toward the edge Se from the central portion Sc of the steel sheet S Can be provided to supply.

For this purpose, the heating member 140 may include a core plate 141 and a coil 142 as a structure for induction heating, and a detailed description thereof will be given later with reference to FIGS. 5 and 6. FIG.

The heating member 140 is configured to move in the width direction of the steel sheet S and can perform a heating operation on the steel sheets S having various widths and is configured to move in the thickness direction of the steel sheet S The steel sheet S having various thicknesses can be subjected to a heating operation, which will be described later in detail with reference to FIGS. 3 and 4. FIG.

The present invention also provides a steel plate correcting apparatus including the temperature deviation reducing unit (100) as well as the temperature deviation reducing unit (100).

That is, the steel plate correcting apparatus according to another embodiment of the present invention is provided downstream of the temperature deviation reducing unit 100 and the temperature deviation reducing unit 100 in the moving direction of the steel sheet S, And a pressing roll unit 200 which is in close contact with the steel plate S that has passed through the unit 100 and applies a pressing force.

Here, the steel sheet straightening apparatus performs a correcting operation after the steel sheet S having passed through the temperature deviation reducing unit 100 is formed at a uniform temperature in the width direction, thereby reducing the residual stress in the correcting operation of the steel sheet S And the problem of deformation of the shape of the steel sheet S due to the residual stress in the subsequent cooling can be prevented.

In other words, the pressing roll unit 200 forms a flat steel sheet S by applying a pressing force to the steel sheet S. At this time, the steel sheet S in a heated state is pressed and calibrated The defect due to the temperature variation in the width direction of the steel sheet S does not appear immediately.

However, when there is a temperature variation along the width direction of the steel sheet S, a relatively large tensile force is applied to the central portion Sc at a high temperature and a relatively small tensile force is applied to the low-temperature edge portion Se, The central portion Sc of the high temperature is relatively shrunk due to the more thermal deformation and the edge portion Se of the low temperature is relatively shrunk due to the small thermal deformation to form the central portion Sc and the edge portion Se ), A deformation of the steel sheet S occurs.

However, in the present invention, the temperature distribution in the width direction of the steel sheet S is uniformly formed in the temperature deviation reducing unit 100 before the calibration by the pressure roll unit 200, It is possible to prevent the shape from changing.

3 is a front view showing a temperature deviation reducing unit 100 according to the present invention. Referring to FIG. 3, the roll member 110 of the temperature deviation reducing unit 100 according to an embodiment of the present invention includes: And a lower roll part 120 provided on the lower surface of the steel sheet S so as to move in a vertical direction according to the thickness of the steel sheet S, (Not shown).

In other words, the roll member 110 includes a lower roll part 120 on which the steel sheet S is seated to move the steel sheet S, and further moves up and down corresponding to the thickness of the steel sheet S And an upper roll part 130 provided in contact with the upper surface of the steel sheet S.

Particularly, the upper roll part 130 is provided with the heating part 140b fixed on the upper part of the heating member 140 to be described later, so that the upper heating part 140b can move up and down synchronously with the heating part 140b, The upper heating portion 140b can always be provided at a certain distance from the upper surface of the steel sheet S regardless of the thickness of the steel sheet S. [

Accordingly, the upper portion of the steel sheet S on the upper surface can have an advantage that the amount of heat input by the heating portion 140b can be accurately supplied.

This is because the lower portion of the heating member 140 to be described later which heats the lower surface of the steel sheet S is always fixed so as to be kept at a certain distance from the lower surface of the steel sheet S, It is possible to accurately control the heat input amount with respect to the upper surface and the lower surface and to increase the accuracy of the uniform temperature distribution in the width direction of the steel sheet S.

In other words, the heating member 140 of the temperature deviation reducing unit 100 according to an embodiment of the present invention includes the lower heating unit 140a provided between the plurality of lower rollers 120, And an upper heating portion 140b fixedly coupled to the upper shaft 131 of the upper roll portion 130. [

The upper heating portion 140b is maintained at a certain distance from the upper surface of the steel sheet S by the upper roll portion 130. [

Since the lower roll 120 supports the steel sheet S, it is preferable that the lower roll 120 is longer than the steel sheet S so as to support the entire steel sheet S in the width direction.

Since the upper roll part 130 only needs to be positioned with respect to the steel sheet S, the upper roll part 130 may be provided to have a length contacting only one side of the steel sheet S. For example, as shown in FIG. 3, But may be provided only to the edge portion Se of the steel sheet S.

Particularly, the upper roll 132 of the upper roll part 130 is provided only at the edge Se of the steel sheet S and the upper part of the upper roll part 130 is provided upstream of the heating part 140b in the moving direction of the steel sheet S It can also serve as a guard to prevent the upper portion from colliding with the heating portion 140b even when the edge portion Se of the steel sheet S is deformed and enters by bending or the like.

The temperature deviation reducing unit 100 according to an embodiment of the present invention includes a heating member 140 and a moving member 150 for moving the heating member 140 in the width direction of the steel sheet S ).

This is for providing the heating member 140 to the edge portion Se of the steel sheet S corresponding to various widths of the steel sheet S. [

To this end, the moving member 150 may include a seating plate 151, a sliding plate 152, and a regulating cylinder 153.

Here, the sliding plate 152 is fixed to the supporting bar 133 with the upper heating portion 140b fixed to the upper shaft 131, and the lower heating portion 140a is fixed And is moved in the width direction of the steel plate S by the adjusting cylinder 153.

The sliding plate 152 may be provided on the seating plate 151 to guide the sliding movement. To this end, the sliding plate 152 includes a portion wider than the seating plate 151, and a guide tab protruding toward the seating plate 151 is formed at an end of the sliding plate 152 .

When the heating member 140 is moved in the width direction of the steel sheet S by the moving member 150, the length of the supporting bar supporting the upper heating portion 140b may be increased or decreased, The roll unit 130 may also include an accommodating cylinder 135. The receiving cylinder 135 is preferably provided as a tubular member into which the supporting rod is inserted.

FIG. 4 is a plan view showing the temperature deviation reducing unit 100 of the present invention. Referring to FIG. 4, the upper roll unit 130 of the temperature deviation reducing unit 100 according to an embodiment of the present invention includes: And an upper roll 132 which is rotatably coupled to the upper plate 131 and is disposed upstream of the heating unit 140b in the moving direction of the steel plate S and in contact with the upper surface of the steel plate S, .

In other words, when the upper roll 132 is provided upstream of the upper heating portion 140b in the moving direction of the steel sheet S, the edge Se of the steel sheet S is deformed by warping or the like So that it acts as a guard to prevent the upper portion from colliding with the heating portion 140b.

The upper roll part 130 of the temperature deviation reducing unit 100 according to an embodiment of the present invention has guide holes 133a through which both ends of the upper shaft 131 are inserted in the longitudinal direction, And a drive cylinder 134 coupled at one end to the upper end of the support bar 133 and coupled to the upper shaft 131 at the other end of the drive barrel 133, 134 moves the upper shaft 131 by a distance such that the upper roll 132 contacts the upper surface of the steel sheet S so that the distance between the upper heating portion 140b and the upper surface of the steel sheet S Is kept constant at all times.

The supporting bar 133 may be coupled to the sliding plate 152 of the moving member 150 in order to move in correspondence with the width of the steel plate S and may include the moving member 150 If not, it can be fixed on the ground.

The upper and lower rollers 132 and 132 are coupled to the upper and lower rollers 132 and 132 so that the upper and lower rollers 132 and 132 are in contact with the upper surface of the steel sheet S in correspondence to the thickness of the steel sheet S, Thereby providing a driving force for moving the upper shaft 131 up and down.

To this end, the other end portion of the driving cylinder 134 is fixedly coupled to the upper shaft 131.

A frame may be provided to connect the upper shaft 131 and the upper shaft 140b so that the upper shaft 140b is fixedly coupled to the upper shaft 131. [ For example, the upper heating portion 140b may be coupled to the upper shaft 131 by a support bar.

Particularly, when the upper part moves in the heating part 140b corresponding to the width of the steel sheet S by the moving member 150, the supporting rod is inserted into the receiving cylinder 135 .

In order to guide the upward movement of the upper roll 132 and the upper heating part 140b coupled to the upper shaft 131, the support bar 133 is provided with a guide The hole 133a may be formed in the longitudinal direction. A stopper for supporting the guide in the guide hole 133a is formed adjacent to the guide hole 133a on the upper shaft 131 inserted into the guide hole 133a.

5 is a plan view showing a heating member 140 in the temperature deviation reducing unit 100 according to the present invention. Referring to FIG. 5, the heating member 140 The core plate 141 and the core plate 141 are provided on the lower surface of the edge portion Se of the steel sheet S and are provided in a triangular or trapezoidal shape whose width is narrower toward the central portion Sc of the steel sheet S, And induction heating of the steel sheet S including the coil 142 wound and provided on the core plate 141 may be performed.

In other words, the heating member 140 is configured to heat the edge portion Se of the steel sheet S and increase the amount of heat input to the edge portion Se from the central portion Sc of the steel sheet S The coil 142 for performing induction heating, and the core plate 141 having a triangular or trapezoidal shape are provided so as to be supplied with a large supply.

Particularly, since the core plate 141 is provided in such a shape that its width becomes wider toward the edge Se of the steel sheet S, the amount of heat input from the edge Se of the steel sheet S Can be increased.

That is, since a larger number of coils 142 are wound on the wide portion of the core plate 141, more induced currents are formed in the corresponding portions of the steel sheet S by the flow of more current, And the amount of heat input to the edge portion Se of the steel sheet S increases.

In this case, the coil 142 may be provided as one member and wound. That is, by providing the coil 142 that forms one current (I) path, it is possible to supply the heat input amount corresponding to the wound area of the coil 142.

In other words, the amount of heat input by the coil 142 is the same, but the shape of the core plate 141 is provided in a triangular or trapezoidal shape to control the amount of heat input in proportion to the area of the core plate 141 .

That is, the coil 142 of the temperature deviation reducing unit 100 according to an embodiment of the present invention may be provided by being wound in one pass with respect to the entire core plate 141, 5 (a).

Meanwhile, the coil 142 of the temperature deviation reducing unit 100 according to an embodiment of the present invention divides the core plate 141 into a plurality of regions in the width direction of the steel sheet S, And the coil 142 is separately wound around the core plate 141 by applying an electric current to the core plate 141.

In this case, the amount of heat input can be controlled by supplying the current (I1 to I6, etc.) supplied by the core differently from the shape of the core plate 141 to each region. This is illustrated in Fig. 5 (b).

In other words, when a large amount of heat input is desired, a high ampere current is supplied. When a low heat input amount is desired, a low ampere current is controlled.

That is, as the area closer to the edge Se of the steel sheet S is supplied, a current of a high ampere is supplied to control the differential input heat quantity.

6 is a plan view showing a modified embodiment of the core plate 141 in the heating member 140 of the temperature variation reducing unit 100 of the present invention. The core plate 141 of the unit 100 may have a plurality of stepped shapes such as a triangular or trapezoidal inclined surface on which the coil 142 is wound.

This is a shape for stably winding the coil 142 when the coil 142 is wound around the core plate 141. In other words, the coil 142 is wound on the step-shaped flat portion.

In addition, the core plate 141 of the temperature deviation reducing unit 100 according to an embodiment of the present invention includes protruding protrusions 141a for preventing the coil 142 from being separated from the ends of the plurality of stepped shapes And the like.

The projecting step 141a is also configured to prevent the coil 142 from being separated after the coil 142 is wound on the inclined surface of the core plate 141. [

100: temperature deviation reducing unit 110: roll member
120: lower roll part 130: upper roll part
131: Upper shaft 132: Upper roll
133: support bar 134: drive cylinder
135: receiving cylinder 140: heating member
141: core plate 142: coil
150: moving member 151: seating plate
152: sliding plate 153: adjusting cylinder
200: pressure roll unit

Claims (12)

A roll member provided on a moving path of the steel strip; And
A heating member provided adjacent to the roll member for heating the steel sheet and supplying a larger amount of heat to the edge of the steel sheet;
/ RTI >
Wherein,
A lower roll portion having the lower surface of the steel plate so as to be in contact with the steel plate to move and move the steel plate; And
An upper roll portion provided in contact with an upper surface of the steel plate and adapted to move up and down according to a thickness of the steel plate;
Lt; / RTI >
The heating member
A lower heating section provided between the plurality of lower roll sections; And
An upper heating portion fixedly coupled to an upper shaft of the upper roll portion moving up and down;
/ RTI >
The upper roll portion
An upper roll rotatably coupled to the upper shaft, the upper roll being provided upstream of the heating part in the moving direction of the steel strip, the upper roll being in contact with the upper surface of the steel strip;
A support bar in which guide holes into which both ends of the upper shaft are inserted are formed in the longitudinal direction; And
A drive cylinder having one end coupled to an upper end of the support bar and the other end extending and contracting to be coupled to the upper shaft;
/ RTI >
Wherein the driving cylinder moves the upper shaft by a distance in which the upper roll contacts the upper surface of the steel plate to maintain a constant distance between the upper heating portion and the upper surface of the steel plate. The method according to claim 1,
The heating member
A core plate provided on a bottom surface of the edge of the steel plate and provided in a triangular or trapezoidal shape whose width is narrower toward the center of the steel plate; And
A coil wound on the core plate;
Wherein the temperature of the steel plate is lower than the temperature of the steel plate. 3. The method of claim 2,
Wherein the core plate has a plurality of stepped portions formed in a triangular or trapezoidal shape in which the coil is wound. The method of claim 3,
Wherein the core plate has a plurality of stepped ends formed with protruding protrusions for preventing the coils from escaping. 3. The method of claim 2,
Wherein the coil is provided by being wound in one pass with respect to the entire core plate. 3. The method of claim 2,
Wherein the coil is divided into a plurality of regions in the width direction of the steel plate and the coils are wound individually by applying a current to the core plate portions of the respective regions separately. delete delete delete delete The method according to claim 1,
A moving member to which the heating member is coupled and moves the heating member in the width direction of the steel plate;
And a temperature deviation reducing unit. The temperature deviation reducing unit according to any one of claims 1 to 6 and 11, And
A pressing roll unit provided downstream of the temperature deviation reducing unit in the moving direction of the steel plate and closely contacting the steel plate passed through the temperature deviation reducing unit to apply a pressing force;
Wherein the steel plate correcting device comprises:

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