KR20160044866A

KR20160044866A - Semi-continuous casting equipment of vertical type and casting method therewith

Info

Publication number: KR20160044866A
Application number: KR1020140139883A
Authority: KR
Inventors: 정태인; 김용인
Original assignee: 주식회사 포스코
Priority date: 2014-10-16
Filing date: 2014-10-16
Publication date: 2016-04-26

Abstract

The vertical semi-continuous casting facility comprises a pair of long side plates arranged to face each other and a pair of short side plates which are arranged so as to intersect with the pair of long side plates and spaced apart from each other so as to face each other, A casting mold for casting the cast steel by cooling the molten steel, a pair of long side portions corresponding to the casting mold and a pair of long side portions which intersect with the pair of long side portions The molten steel injected into the mold at the upper portion is solidified to cast the main body, and the base is lowered in a state of supporting the casting in the casting mold to withdraw the casting from the casting mold. And a heating device for heating the edge region of the upper surface of the table in the longitudinal direction of the table before the table is inserted into the mold.
Therefore, according to the embodiment of the present invention, before the casting is started, the edge region in the direction of the long side of the plate surface is heated in advance or in advance by using the heating apparatus. In other words, in the present invention, the edge region is pretreated so as to have a higher temperature than the central region in the long-side direction of the top surface of the table before inserting the table into the mold and cooling. When the mold is cooled by the mold, there is no difference in the temperature difference between the central region and the edge region in the direction of the long side of the upper surface of the surface of the base plate and the resulting coagulation time point, or the difference is minimized or compared with the conventional case Can be reduced. Therefore, it is possible to prevent or minimize the occurrence of the bending deformation due to the difference in the solidification time on the lower part of the cast formed by solidification on the upper surface of the table.

Description

Technical Field [0001] The present invention relates to a vertical semi-continuous casting apparatus and a casting method using the same,

The present invention relates to a vertical semi-continuous casting apparatus and a casting method using the same, and more particularly, to a vertical semi-continuous casting apparatus capable of preventing bending deformation of a lower portion of a casting and a casting method using the same.

Continuous casting is a continuous casting method in which molten steel is continuously injected into a mold having a predetermined shape, and a casting specimen (hereinafter referred to as "casting") of molten steel, which is reacted in a mold, is continuously drawn to the lower side of the mold, Blooms, billets, and the like. The casting method is to produce semi-finished products of various shapes such as bloom, billet and the like.

Semi-continuous casting is used when the size of the cast steel becomes large and it is difficult to continuously cast. When a certain amount of molten steel is continuously injected into the casting mold, the continuous casting is continuously drawn from the casting mold, It is a casting method in which semi-finished products are manufactured by stagnating in a casting machine and completely solidifying the reacted cast steel.

In a conventional vertical semi-continuous casting machine for producing a cast steel by a semi-continuous casting method, molten steel is introduced into a mold from a tundish, and the casting is cooled and cooled by the cooling water sprayed while passing through a guide roll provided right under the casting mold. It is pulled out. In order to draw the casting from the casting mold, a base plate is coupled to the lower end face of the casting to support the casting casting, and the base plate is driven up and down by a separate driving means, and the casting die is pulled out from the casting mold by the base plate driven downward.

The mold is composed of a pair of facing long side plates and a pair of short side plates connected to each pair of long side plates so as to cross each other. When molten steel is introduced into the mold after cooling the molten steel into the mold, the molten steel is brought into contact with the surface of the molten steel to start cooling. The time point at which the molten steel is solidified in the edge region of the upper surface of the surface of the plate is faster than the point of time when the molten steel is solidified in the surface of the surface of the plate in contact with the surface of the molten steel. 7, the lower portion of the cast steel, which has started to solidify on the base 60, has a curved deformation in the long-side direction, as shown in FIG. 7, Lt; / RTI > That is, at the long side of the lower part of the cast steel, the central region of the long side is protruded or convexly deformed in the frontal direction as compared with the edge. To explain this, deflection occurs in the lower part of the cast steel, where the short side portion of the cast steel corresponding to the short side plate is separated from the base. As a result, the edge of the lower part of the cast steel is spaced apart from the base 60, and a gap is generated. When the molten steel flows into the gap in the state where the gap is generated, an accident that the molten steel falls or leaks to the outside of the mold 30 may occur.

In order to prevent the deformation of the lower part of the cast steel, there is a method of weakening the cooling of the short side plate as compared with the long side plate of the casting mold as in Japanese Laid-Open Patent Publication No. 1999-197801.

Japanese Laid-Open Patent Publication No. 1999-197801

The present invention provides a vertical semi-continuous casting facility capable of preventing bending deformation of a lower part of a casting and a casting method using the same.

Further, the present invention provides a vertical semi-continuous casting apparatus and a casting method using the same, which can prevent warpage deformation due to a difference in solidification time between a center region and an edge region in a long side direction of a lower portion of a casting.

The vertical semi-continuous casting plant according to the present invention comprises a pair of long-side plates spaced apart from each other to face each other and a pair of short-side plates arranged to intersect with the pair of long-side plates and spaced apart from each other, A casting mold for casting molten steel into an internal space defined by a pair of long side plates and a pair of short side plates to cool the molten steel; A pair of long side portions and a pair of short side portions intersecting with the pair of long side portions so as to correspond to the casting mold and inserted into the casting mold so that molten steel injected into the casting mold on the upper portion is solidified to cast the casting lead, A platen that descends while supporting the casting in the casting mold and draws the casting from the casting mold; And a heating device installed on the outer side of the mold and heating the edge area of the upper surface of the table in the longitudinal direction of the table before the table is inserted into the mold.

Wherein the heating device includes a pair of heating members positioned above the upper surface of the table positioned below the mold and heating the table, wherein the pair of heating members are arranged such that, when the table is heated, Of the upper surface of the base plate.

The heating device includes: an up-down unit connected to the pair of heating members to raise and lower each of the pair of heating members; And the pair of heating members are horizontally moved so that the pair of heating members are positioned on the upper side of the upper surface of the table top and the upper side of the edge region in the longitudinal direction of the table, Or horizontally moving the pair of heating members to horizontally move away from each other.

It is effective to include a moving truck which is horizontally movable toward or away from the base plate by mounting the pair of heating members, the elevating and lowering unit and the horizontal moving section.

The vertical semi-continuous casting method according to the present invention is a vertical semi-continuous casting method comprising the steps of heating the edge region in the longitudinal direction of the plate located outside the mold and controlling the temperature of the plate so that the temperature of the edge region in the longitudinal direction is higher than that in the central region ; Inserting the heated platen into a lower side of the mold; Supplying molten steel to the mold to cool the molten steel to cast a slab; And lowering the base plate while supporting the bottom of the cast steel, thereby drawing the cast steel from the casting mold.

A pair of heatable heating members are arranged on the upper side of the upper surface of the table in the process of heating the edge region in the longitudinal direction of the table located outside the mold to adjust the temperature of the table, , And a vertical semicontinuous casting method in which both edge regions are located.

The distance between the pair of heating members is set to be longer than the length in the long side direction of the base plate in a process of positioning the pair of heating members on the upper side of the base plate in the long side direction of the base plate A process of horizontally moving and adjusting; Raising the pair of heating members to the upper side of the table; And horizontally moving each of the pair of heating members so that each of the pair of heating members is positioned on the upper side of the upper surface of the table so as to be located on the upper side of both edge regions in the longer side direction.

And moving the heating member to the outside of the mold and the mold after finishing the process of adjusting the temperature of the surface of the mold by heating the edge region in the longitudinal direction of the mold located outside the mold.

According to the embodiment of the present invention, before the casting is started, the edge region in the longitudinal direction of the plate is heated in advance or in advance by using a heating device. In other words, in the present invention, the edge region is pretreated so as to have a higher temperature than the central region in the long-side direction of the top surface of the table before inserting the table into the mold and cooling. When the mold is cooled by the mold, there is no difference in the temperature difference between the central region and the edge region in the direction of the long side of the upper surface of the surface of the base plate and the resulting coagulation time point, or the difference is minimized or compared with the conventional case Can be reduced. Therefore, it is possible to prevent or minimize the occurrence of the bending deformation due to the difference in the solidification time on the lower part of the cast formed by solidification on the upper surface of the table.

1 to 3 are views showing a vertical semi-continuous casting facility according to an embodiment of the present invention
FIG. 4 is a cross-sectional view of the upper part of the mold viewed from the upper side in the state where the table is inserted into the mold according to the embodiment of the present invention.
5 is a view for explaining the positional state and moving operation of the heating member according to the embodiment of the present invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of other various forms of implementation, and that these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know completely.

1 to 3 are views showing a vertical semi-continuous casting facility according to an embodiment of the present invention. FIG. 1 shows a state in which a heating apparatus according to an embodiment of the present invention heats an edge of a base before starting a casting operation. FIG. 2 shows a state in which a base is heated by a heating apparatus according to an embodiment of the present invention, FIG. 3 is a view showing a state in which a cast steel is continuously cast by lowering a surface plate. FIG. 3 is a view showing a state in which casting is started by inserting a surface plate into a casting mold. FIG. 4 is an upper cross-sectional view of a state in which a table is inserted into a mold according to an embodiment of the present invention, viewed from the upper side of the mold. 5 is a view for explaining a positional state and a moving operation of the heating member according to the embodiment of the present invention.

1 to 3, a vertical semi-continuous casting facility according to an embodiment of the present invention includes a tundish 100 for temporarily storing molten steel, a tundish 100 for supplying molten steel from the tundish 100, A spindle S which is provided right below the casting mold 300 and is pulled out from the casting mold 300 and which is movable up and down by supporting the casting mold 300 and the casting S, A heating unit 800 for heating the edge of the base 600 before casting is started, a roll unit 500 for cooling the cast steel S while guiding the casting S, a lifting unit (not shown) for lifting and lowering the base 600, ). The nozzle 200 is connected to one end of the tundish 100 and the other end of the tundish 300 to be inserted into the mold 300 and supplies the molten steel to the mold. And an agitating device 400 that stirs molten steel in the mold 300 and stirs and heats the top portion of the cast S.

The tundish 100 is a means for temporarily storing molten steel to continuously supply the molten steel of the mold 300 and has an inner space and is located above the mold 300. A nozzle 200 is installed under the tundish 100.

The casting mold 300 primarily cools the liquid molten steel supplied from the tundish 100 and continuously casts the cast steel S having a rectangular cross section. The mold 300 has a cylindrical shape with an upper space and a lower side opened, and the shape of the cross section is rectangular. More specifically, the mold 300 comprises a pair of long side plates 310 and a pair of short side plates 320, as shown in FIG. That is, the two long side plates 310 are disposed to face each other so as to be parallel to each other, and the two short side plates 320 are arranged parallel to each other and perpendicular to the two long side plates 310. In other words, the mold 300 has first and second long-side plates 310 and second and third long-side plates 310, which are parallel to each other and opposed to each other, and first and second long-side plates 310, A first short side plate 320 connected to one end of the first long side plate 310 and connected to one end of the second long side plate 310 at the other end and a first short side plate 320 connected to one end of the first long side plate 310 orthogonal And a second short side plate 320 connected at one end to the other end of the first long side plate 310 and at the other end connected to the other end of the second long side plate 310. Thus, the cross section of the mold 300, which is composed of the pair of long side plates 310 and the pair of short side plates 320, has a rectangular inner space. Of course, the shape of the transverse section of the mold 300 is not limited to a rectangle having a long side and a short side, but can be transformed into a square, various polygonal shapes.

The mold 300 is a water-cooled mold provided with a cooling water pipe (not shown) in which cooling water is circulated. The molten steel injected into the mold 300 is first cooled to form a solidified region B And the non-solidified region A coexists.

The stirring device 400 is installed around the outer periphery of the mold 300 to stir the molten steel in the mold 300. The stirring device 400 according to the embodiment of the present invention is an electromagnetic magnetic stirrer (EMS) which stirs molten steel by forming a magnetic field in molten steel. As the molten steel is stirred in the mold 300 by the stirring device 400, the initial solidification layer of the billet S in the mold 300 can be uniformly formed.

Of course, the stirrer 400 is not limited to the electromagnetic stirrer (EMS) described above, and various means capable of stirring molten steel and non-solidified molten steel within the mold 300 can be applied.

The roll unit 500 is positioned below the casting mold 300 and passes through the casting S so as to physically interfere with the expansion of the casting S and to guide the casting S in a direction perpendicular to the paper surface, and the cooling water is sprayed or sprayed on a plurality of rolls positioned below the foot roll 510 to guide the slip S passing through the foot roll 510. The slip S is subjected to secondary cooling (Not shown).

The configuration of the tundish 100, the mold 300, and the roll unit 500 described above need not be limited to the specific configuration in the present invention, and the various configurations and operation methods are well known to those skilled in the art. It is omitted.

The platen 600 descends while supporting the cast slab S drawn to the lower side of the casting mold 300 in a direction perpendicular to the paper surface and continuously withdraws the slab S from the casting mold 300. The platen 600 is partially or wholly inserted into the mold 300 before the molten steel flows into the mold, and when the molten steel flows into the mold 300 and begins to solidify first, the platen 600 gradually falls. The base 600 has a shape in which the cross section thereof corresponds to the cross section of the mold 300, that is, a rectangular shape. That is, the base 600 has a rectangular shape including a pair of long side portions 61 and a pair of short side portions 62 (see FIG. 4).

Although not shown, a drive unit for moving the base 600 in the up and down direction is connected to the base 600. The driving unit may be configured to include, for example, a moving member on which the base 600 is seated, and a driving portion coupled to a lower portion of the moving member to drive the moving member up and down. The driving unit may be implemented in various ways such as a gear system using a motor, a belt, a pulley system, a cylinder system, and the like. In the embodiment of the present invention, a hydraulic piston is used.

On the other hand, the molten steel injected or introduced into the mold 300 by molten steel is brought into contact with the upper surface of the surface plate 600, cooled by the primary cooling by the mold 300 while being in contact with the upper surface of the surface plate 600 , And begins to solidify. In the case of the mold 300 including the long side plate 310 and the short side plate 320, the cooling ability of the short side plate 320 is larger than that of the long side plate 310. Therefore, when the molten steel flowing into the mold 300 is cooled and solidified, the time point at which the molten steel adjacent to the short side plate 320 is solidified is faster than the solidification point when compared with the other regions. The edge of the mold 300 or the short side plate 320 and the end face of the mold 300 are positioned in the longitudinal direction of the mold 300 in comparison with the molten steel in the central region of the mold 300. In other words, The molten steel in the adjacent region starts to solidify more quickly, and coagulation shrinkage occurs at the difference in solidification timing.

The difference in solidification time between the long side plate 310 and the short side plate 320 is affected by the first contact and solidification of the molten steel on the surface plate 600 so that the temperature of the short side plate 320 at the upper surface of the surface plate 600 is reduced, And the time when the molten steel in the adjacent region coagulates is faster than the other regions. The time when the molten steel is solidified in the edge region of the upper surface of the surface plate 600 when the molten steel is contacted and cooled on the surface of the surface plate 600 is referred to as the center of the surface of the surface plate 600, Is faster than when the molten steel in the region coagulates. The lower part of the cast steel S which has started to solidify on the base 600 is curved in the direction of the long side, The bending deformation of the bushing is generated. That is, at the long side of the slab S, as shown in Fig. 7, the central region of the long side is protruded or convexly deformed in the direction of the base plate 600 as compared with the edge. To be more specific, in the lower portion of the cast steel S, warpage occurs in which the short side portion 62 of the cast steel S corresponding to the short side plate 320 is separated from the base plate.

Therefore, it is necessary to reduce the difference in solidification time due to the temperature difference between the edge region and the center region on the upper surface in the long side direction of the base 600 at the beginning of casting. Accordingly, in the present invention, when the molten steel is solidified at the upper part of the base 600, the center of the upper surface of the base 600 is adjusted to have a different solidification timing at the edge area based on the long side direction. More specifically, before the start of casting, the edge region is previously or previously heated in the direction of the long side of the base 600 so that the edge region of the base 600 is higher than the center region. In other words, the central region of the base 600 has a lower temperature than the edge region. More specifically, in particular, before the start of casting, the edge region of the upper surface of the base 600 is preheated or heated in advance in the longitudinal direction of the upper surface of the base 600 so that the edge region of the upper surface of the base 600 faces the base 600) of the upper surface. In other words, the central region of the upper surface of the base plate 600 is lower in temperature than the edge region of the upper surface of the base plate 600.

Thus, in the present invention, the edge region of the base 600 is heated in advance to make the temperature higher than the central region, and the base 600 is inserted into the mold 300 while keeping the temperature difference, do. Then, the molten steel and the base 600 start to be cooled by the mold 300 at the beginning of the casting, and when the low temperature of the mold 300 is transferred or cooled by the base 600, When the base 600 is cooled by the mold at the beginning of the casting, the temperature of the edge region of the upper surface in the longitudinal direction of the base 600 And there is no difference in temperature between the center region and the center region, or is smaller than the conventional one.

The temperature difference value between the edge region and the center region in the long side direction of the upper surface of the surface plate 600 by heating the surface plate 600 through the heating device 800 is set such that the surface plate 600 is inserted into the mold 300 The heat conduction rate or the heat conduction velocity of the upper surface in the long-side direction of the surface plate 600 is related to the heat conduction velocity at the beginning of casting in which cooling is started by the mold 300. That is, the temperature difference between the central region and the edge region of the upper surface in the longitudinal direction of the plate by heating by the heating device 800 is such that the plate 600 is inserted into the mold 300 and cooled, There is a relationship with the time or time at which the edge region and the central region in the long side direction of the base plate 600 are cooled to the solidification temperature of the molten steel at the initial stage of solidification.

As described above, by heating the edge region in the long side direction of the base 600 and inserting the edge region into the mold 300 in a state where the temperature is high in the central region and cooling the edge region, And the central region are cooled to the solidification temperature of the molten steel are similar or the same, or the time difference interval is reduced compared with the conventional case. This is because the edge region in the longitudinal direction of the base 600 is first cooled or the temperature is lower by the ordinary mold 300 in the initial stage of casting, but in the present invention, the temperature of the edge region is relatively higher at the beginning of the casting than in the center region, This is because the time or time at which the region cools the solidification temperature is the same as or similar to the central region, or the difference is small compared to the conventional case.

The heating apparatus 800 according to the embodiment of the present invention is installed outside the edge of the base 600 before the base 600 is inserted into or charged into the mold 300, An ascending and descending unit 830 connected to the heating device 800 to move up and down, and a horizontal moving unit 840 for controlling the width of the heating device 800. Although not shown, the power supply unit for applying power for generating heat to the heating apparatus 800, the above-described heating apparatus 800, the ascending / descending unit 830, the power supply unit, and the horizontal shifting unit 840 And a movable carriage 880 movable in a mounted state.

The heating unit 810 heats the outer edge or edge region of the table 600 in the longitudinal direction of the table 600 (see FIG. 5). In other words, the heating device 800 heats the region including the short side portion 62 corresponding to the outer edge or edge region in the long-side direction of the base 600. The heating device 800 includes a pair of heating members 811a and 811b provided at positions opposed to both edge regions or a pair of short sides 62 in the long side direction of the base 600, And heating members 812a and 812b which are respectively installed in the heating members 811a and 811b and which heat the pair of heating members 811a and 811b.

Each of the pair of heating members 811a and 811b is opposed to a pair of short sides 62 of the base 600 and each of the pair of the heating members 811a and 811b faces toward a pair of short sides 62 of the base 600 It is horizontally movable in the opposite direction. Each of the pair of heating members may have a shape corresponding to a pair of short sides 62 of the base 600, and the shape of the cross section may be, for example, rectangular. Is equal to or larger than the length in the short side direction of the base 600.

Each of the pair of heating members 811a and 811b is moved toward the pair of short sides 62 or away from the pair of short sides 62 as described above by the horizontally moving unit 840 described later It is horizontally movable. At this time, the pair of heating members 811a and 811b are horizontally moved so as to be positioned on the edge region in the long side direction of the table, that is, the upper side of the short side portion 62, in order to heat the upper surface of the table 600 before the start of casting. An edge region or a region including a short side of the upper surface of the table 600 is positioned below each of the pair of heating members 811a and 811b. That is, the edge region of the upper surface of the table 600 is positioned below the pair of heating members 811a and 811b, and the edge regions of the upper surfaces of the pair of heating members 811a and 811b and the upper surface of the table 600, Make the locations overlap each other.

The heating elements 812a and 812b generate heat by a power source supplied from a power supply unit and heat the heating members 811a and 811b, and may be, for example, induction heating coils.

The ascending and descending unit 830 raises the heating apparatus 800 to the upper side of the table 600 for heating the table 600 or lower the heating apparatus 800 after the heating of the table 600 is completed. This ascending and descending unit 830 includes a pair of ascending and descending members 831 connected to each of the pair of heating members 811a and 811b and a pair of ascending and descending members 831 for ascending or descending the pair of ascending and descending members 831, (832).

The horizontal moving unit 840 horizontally moves each of the pair of heating members 811a and 811b so that the pair of heating members 811a and 811b move horizontally . In other words, the horizontally moving part 840 is positioned such that each of the pair of heating members 811a and 811b is brought close to the short side part 62 from the upper side of the base 600 or the position thereof is overlapped with the short side part 62 Or horizontally moved away from the short side portion 62 of the base 600. The horizontal moving unit 840 may be connected to a pair of elevating and lowering driving units 832 connected to the pair of heating members 811a and 811b. The horizontal moving unit 840 may include a guide rail and a horizontally moving block slidable or slidable along the guide rail. However, the horizontal moving unit 840 may be configured to move the heating members 811a and 811b horizontally Various means are applicable.

The power supply unit applies power for heating to the heating apparatus 800 and includes a power supply unit for supplying power and a power supply unit having one end connected to the power supply unit and the other end connected to the heating elements 812a and 812b of the heating apparatus 800 Power line.

The moving truck 880 horizontally moves in a direction perpendicular to the pulling direction of the slab S, that is, in a horizontal direction with respect to the paper sheet, and includes a heating device 800, a power supply unit, an elevating unit 830, And moves to a state in which the moving unit 840 is mounted. The moving carriage 880 is in a position corresponding to the platen 600 so as to heat the platen to start casting. When heating of the platen 600 is completed and the platen 600 is inserted into the mold, 600 or out of the mold 300.

According to the embodiment of the present invention, the edge region in the longitudinal direction of the base plate 600 is heated in advance or beforehand by using the above-described heating apparatus 800 before starting casting. This is because the molten steel is solidified on the upper surface of the surface plate 600 when the surface plate 600 is inserted into the mold 300 and then the molten steel is supplied into the mold 300 to primarily cool the molten steel. So that the edge region in the direction of the long side of the top surface is prevented from solidifying earlier than the center region. That is, when the base 600 is inserted into the mold 300, the cooling water is cooled by the long side plate 310 and the short side plate 320 of the mold 300 in which the cooling water circulates. At this time, The solidification of the molten steel in the edge region takes place earlier than the solidification in the central region in the direction of the long side of the upper surface of the base 600. The different solidification time is due to the difference in cooling ability between the long side plate 310 and the short side plate 320 of the mold 300. Therefore, in the present invention, before the base plate 600 is inserted into the mold 300 and cooled, the edge region is pretreated so as to have a higher temperature than the central region in the long side direction of the upper surface of the base plate 600, The temperature difference between the central region and the edge region in the long side direction of the upper surface of the surface plate 600 and thus the difference in the solidification time due to inserting it into the mold 300 and cooling the mold 300, It can be reduced compared with the conventional art.

Hereinafter, a casting method using a vertical semi-continuous casting equipment according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG.

First, the edge region of the upper surface of the base 600 is heated before starting casting. More specifically, in the long-side direction of the upper surface of the base 600, the region including the edge region or the short side portion 62 is heated. To this end, the moving carriage 880 of the heating apparatus 800 is driven so that the heating apparatus 800 is positioned below the table 600. The horizontal moving unit 840 is operated so that the pair of heating members 811a and 811b of the heating apparatus 800 are moved horizontally away from each other so that the distance between the pair of heating members 811a and 811b (See the dotted lines 811a and 811b in FIG. 5). The pair of heating members 811a and 811b are raised so that the pair of heating members 811a and 811b are positioned above the table 600 by operating the ascending / descending unit 830. Thereafter, the horizontal moving unit 840 is operated again to horizontally move the pair of heating members 811a and 811b so as to be close to each other. At this time, as shown in FIGS. 1 and 5 (solid lines of 811a and 811b) Each of the pair of heating members 811a and 811b is positioned on the upper side of the edge region in the direction of the longer side of the upper surface of the base 600. [

When a pair of heating members 811a and 811b are positioned above the edge region in the long side direction of the upper surface of the table 600 as shown in FIG. 1, the power supply unit is operated to heat the heating elements 812a and 812b of the heating apparatus 800 Power is applied to heat the pair of heating members 811a and 811b for a predetermined time. When the pair of heating members 811a and 811b are heated, the temperature of the edge region is higher in the upper surface of the surface plate 600 than in the central region with respect to the long side direction.

The heating device 800 heats the edge area of the upper surface in the longitudinal direction of the table and moves the heating device 800 to the outside of the table when a temperature difference occurs between the edge area and the center area. That is, the horizontal moving unit 840 is operated to horizontally move the pair of heating members 811a and 811b of the heating device 800 so as to move away from each other so that the distance between the pair of heating members 811a and 811b (See the dotted lines 811a and 811b in FIG. 5). The pair of heating members 811a and 811b are lowered by operating the up-and-down unit 830 so that the pair of heating members 811a and 811b are positioned below the base 600. [ Thereafter, the moving carriage 880 of the heating apparatus 800 is driven so that the heating apparatus 800 is positioned on the lower side of the table 600.

Then, as shown in FIG. 2, the base 600 is lifted and inserted into the mold 300. When the base plate 600 is inserted into the mold 300, the molten steel of the tundish 100 is continuously supplied to the mold 300, and the molten steel introduced therein is first cooled. The molten steel introduced into the mold 300 at the beginning of the casting is brought into contact with the upper surface of the surface plate 600 and solidified on the surface plate 600. At this time, when the molten steel is brought into contact with the surface of the base 600 and solidified, the edge of the upper surface of the base 600 and the start point of solidification in the central region are the same, or the difference in solidification timing is smaller than in the conventional case. This is because the edge region of the upper surface is heated in the longitudinal direction of the base 600 before the base 600 is inserted into the mold 300 so that the temperature of the edge region is relatively higher at the beginning of the casting than in the central region, This is because the time or time at which the region cools to the solidification temperature is the same as or similar to the central region, or the difference is smaller than in the past. Therefore, it is possible to prevent or minimize the occurrence of warpage due to the difference in solidification time at the lower part of the cast steel S formed by solidification on the base 600 (see FIG. 6).

Thereafter, when the slab S starts to solidify in the mold 300, the slab 600 inserted in the lower portion of the mold 300 is lowered to pull the slab S out of the mold. The drawn cast steel S is secondarily cooled by the cooling water injected while passing through the roll unit 500.

When the cast steel S is continuously cast in the same manner as described above and the cast steel S is cast to a predetermined length, the operation of feeding the molten steel of the tundish 100 to the casting mold 300 is stopped, Conduct. At the end of the casting, the end portion of the cast steel S is pulled out from the casting mold, as shown in Fig. 2, by the continuous lowering operation of the base 600. Fig. And is moved to the outside of the drawn slab S to perform additional operations such as cutting.

300: Template 600: Plate
61: long side portion 62: short side portion
800: Heating device 810: Heating unit
811a, 811b: heating member

Claims

A pair of long side plates spaced apart from each other so as to face each other, and a pair of short side plates arranged to intersect with the pair of long side plates and spaced apart from each other to face each other, wherein the pair of long side plates and the pair of short side plates A mold for introducing molten steel into an inner space defined by the molten steel and cooling the molten steel to cast the molten steel;
A pair of long side portions and a pair of short side portions intersecting with the pair of long side portions so as to correspond to the casting mold and inserted into the casting mold so that molten steel injected into the casting mold on the upper portion is solidified to cast the casting lead, A platen that descends while supporting the casting in the casting mold and draws the casting from the casting mold;
A heating device installed outside the mold and heating the edge area of the upper surface of the table in the longitudinal direction of the table before the table is inserted into the mold;
A vertical semi-continuous casting plant.

The method according to claim 1,
Wherein the heating device includes a pair of heating members positioned above the upper surface of the table located below the mold and heating the table,
Wherein the pair of heating members are located above the edge region of the upper surface of the table in the longitudinal direction of the table when the table is heated.

The method of claim 2,
The heating device includes:
An elevating and lowering unit connected to the pair of heating members to raise and lower each of the pair of heating members;
And the pair of heating members are horizontally moved so that the pair of heating members are positioned on the upper side of the upper surface of the table top and the upper side of the edge region in the longitudinal direction of the table, Or horizontally moving the pair of heating members horizontally away from each other;
A vertical semi-continuous casting plant.

The method of claim 3,
And a moving carriage which is horizontally movable toward or away from the table base by mounting the pair of heating members, the elevating and lowering unit and the horizontal moving section.

Heating the edge region in the longitudinal direction of the plate located outside the mold to adjust the temperature of the plate so that the temperature of the edge region in the longitudinal direction of the plate is higher than that of the center region;
Inserting the heated platen into a lower side of the mold;
Supplying molten steel to the mold to cool the molten steel to cast a slab; And
Lowering the base plate while supporting the bottom of the cast steel, and drawing the cast steel from the casting mold;
/ RTI > A method of vertical semi-continuous casting.

The method of claim 5,
Heating the edge region in the direction of the long side of the plate located outside the mold to adjust the temperature of the plate,
Wherein a pair of heatable heating members are located on both sides of the upper surface of the table in the longitudinal direction of the table.

The method of claim 6,
In the process of causing the pair of heating members to be positioned on the upper surface of the table in the longitudinal direction of the table,
Horizontally moving and adjusting the spacing distance between the pair of heating members so as to be greater than the length in the longitudinal direction of the plate;
Raising the pair of heating members to the upper side of the table; And
Moving each of the pair of heating members horizontally so that each of the pair of heating members is positioned on the upper side of the upper surface of the table so as to be located on the upper side of both edge regions in the longer side direction;
/ RTI > A method of vertical semi-continuous casting.

The method of claim 7,
A step of heating the edge region in the direction of the long side of the plate located outside the mold and moving the heating member to the outside of the plate and the mold after finishing the process of adjusting the temperature of the plate; Way.