KR20170011099A - Unit for Preventing Surface Defects of Slab, Casting Apparatus having the same, and Casting Method - Google Patents

Unit for Preventing Surface Defects of Slab, Casting Apparatus having the same, and Casting Method Download PDF

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Publication number
KR20170011099A
KR20170011099A KR1020150103074A KR20150103074A KR20170011099A KR 20170011099 A KR20170011099 A KR 20170011099A KR 1020150103074 A KR1020150103074 A KR 1020150103074A KR 20150103074 A KR20150103074 A KR 20150103074A KR 20170011099 A KR20170011099 A KR 20170011099A
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temperature
casting
slab
cast steel
unit
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KR1020150103074A
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Korean (ko)
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KR101719514B1 (en
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신기태
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주식회사 포스코
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1213—Accessories for subsequent treating or working cast stock in situ for heating or insulating strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

The present invention provides a temperature control apparatus comprising a temperature regulating unit located on a traveling path of a casting and having a plurality of temperature regulators respectively disposed on both sides of the casting so as to raise the temperature of a corner portion of the casting, And a pressing portion which is disposed on at least one of the upper side and the lower side of the casting so as to press the center portion of the casting, thereby preventing the occurrence of defects at corner portions of the casting.

Description

Technical Field [0001] The present invention relates to a casting defects preventing unit, a casting apparatus having the casting defects preventing unit, and a casting method,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting defects prevention unit, a casting apparatus having the casting defects prevention unit, and a casting method, and more particularly to a casting defects prevention unit capable of preventing defects at corners of a cast steel, And a casting method.

In general, the continuous casting is a casting method in which molten metal is continuously injected into a mold, and a cast product such as a billet, a bloom (Blssm), and a slab is obtained by continuously withdrawing the reacted cast steel from the bottom of the casting mold.

In this continuous casting, the cast steel drawn out of the mold solidifies while passing through the cooling stand. The cooling zone forms a movement path of the casting, and can include a straight section and a curved section. At this time, defects may occur in the slab passing through the point where the straight line section is switched to the curve section or the point where the straight line section is switched from the curve section. That is, the surface of the main body passes through the point where the moving direction is switched, and the surface is flattened while being bent or bent. As a result, an excessive tensile force is generated on the upper surface or the lower surface of the cast steel, resulting in a defect that the surface is cracked at the corner portion of the cast steel.

Conventionally, the entire upper surface or the lower surface of the cast steel is heated to prevent the occurrence of defects at corner portions of the cast steel. However, the center of the cast steel can be convexly expanded due to the action of the iron tack on the molten steel inside the cast steel. As a result, cracks are generated in the cast steel or segregation at the center of the cast steel becomes more severe.

Further, since the corner portion of the cast steel has a larger contact area with the air than the center portion, the corner portion is cooled faster than the center portion. Therefore, when the temperature of the corner portion is heated to an excessively high temperature, the temperature of the center portion between the corner portions can also rise. As a result, the molten steel in the center portion of the cast steel can not be cooled and re-melted or the coagulated layer is weakened, so that the cast steel may be torn.

KR 2012-0074744 A JP 1999-170019 A

The present invention provides a casting defects prevention unit, a casting apparatus having the casting defects prevention unit, and a casting method capable of preventing defects from being generated at corner portions of cast steel.

The present invention provides a casting defects prevention unit capable of preventing the central portion of a cast steel from being expanded, a casting apparatus having the casting defects prevention unit, and a casting method.

The present invention provides a casting defects prevention unit, a casting apparatus having the casting defects prevention unit, and a casting method that can easily adjust the temperature of a corner portion of a cast steel.

The present invention provides a temperature control apparatus comprising: a temperature regulating unit located on a traveling path of a casting and having a plurality of temperature regulators respectively disposed on both sides of the casting so as to raise the temperature of a corner portion of the casting; And a pressing portion located between at least one of the upper side and the lower side of the casting so as to press the center portion of the casting, the pressing portion being located between the plurality of temperature regulators; .

And a driving unit connected to the temperature controller to move the temperature controller in the width direction of the cast steel.

And a control unit for controlling the operation of the temperature controller and the driving unit according to the temperature of the cast steel and the moving distance of the temperature controller.

And a temperature measuring device disposed on at least one of the upper side and the lower side of the casting and measuring the temperature of the casting.

The control unit may include a first transceiver connected to the temperature measuring unit, a determiner determining whether the measured temperature value is within a preset temperature range, and a second controller controlling the operation of the temperature controller according to the determination of the determiner. Controller.

An interval gauge disposed on a side surface of the cast steel and measuring an interval between the cast steel and the cast steel, and a movement distance gauge measuring a movement distance of the temperature regulator in the width direction.

The control unit may include a second transceiver connected to the movement distance measuring unit and the gap measuring unit, and a second controller for controlling the driving unit such that the temperature adjusting unit is spaced apart from the casting by a predetermined distance.

The pressurizing portion includes a pressurizing roll, and the temperature regulator includes at least one of a heat wire, an induction coil heater, and a burner.

The present invention relates to a mold for injecting molten steel; And a plurality of conveying rollers located below the mold and forming a movement path of the casting to be withdrawn; And a casting defect preventing unit disposed between the conveying rollers to pressurize the casting and adjust the temperature of at least a part of the edge of the casting; .

The movement path includes a first straight line section, a curved section, and a second straight line section, and the gable piece defect prevention unit is disposed at a point immediately before the start of the curve section and immediately before the start of the second straight section .

A casting defect preventing unit disposed at a position immediately before the start of the curved section is formed such that at least a part of the casting defect preventing unit surrounds a lower edge of the casting and a casting defect preventing unit disposed at a point immediately before the start of the second straight section At least a portion of which is formed to surround the upper edge of the casting.

Wherein the temperature control unit includes a first heater disposed to surround an upper edge of the cast steel, and a second heater disposed to surround the lower edge of the cast steel, 2 heater.

Wherein the cast steel flaw unit includes a temperature regulator having a plurality of temperature regulators respectively disposed on both sides of the cast steel so as to raise the temperature of the corner portion of the cast steel, And a pressing portion disposed on at least one of the upper side and the lower side of the casting so as to press it.

The present invention relates to a process for casting a cast steel by injecting molten steel into a mold; Adjusting a temperature of a corner portion of the casting which moves along the movement path at a plurality of positions; Pressing the center of the bobbin of the temperature controlled region; .

Wherein the moving path includes a first straight line section, a curved section, and a second straight line section, wherein the temperature of the corner section of the casting is changed to a local temperature at a point immediately before the curved section starts and immediately before the second straight line section starts .

The process of adjusting the temperature of the corner portion of the casting may include heating the corner portion of the casting, Measuring the temperature of the edge portion of the heated casting; Checking whether the measured temperature value is within a preset temperature range; And adjusting the temperature of the casting when the measured temperature value is out of the set temperature range; .

The set temperature range is above the casting temperature of the cast steel and below the casting temperature of the cast steel.

A temperature controller for adjusting a temperature of a corner portion of the cast steel at least at any one of before, during, and after the temperature of the corner of the cast steel; and adjusting a separation distance of the cast steel .

The step of adjusting the separation distance between the temperature regulator and the casting may include the steps of: measuring an interval between the interval gauge for measuring the interval and the interval; Measuring a moving distance of the temperature regulator; Calculating a distance between the temperature regulator and the slab by calculating the gap and the moving distance; And moving the temperature controller such that the calculated value is within a predetermined set distance range; .

According to the embodiments of the present invention, the temperature of the corner portion of the cast steel can be increased immediately before the main beam moves along the straight line section in the curve section or the curve section in the straight section. Thus, when the main body passes through the section where the path is switched, the corner portion of the main body can be made flexible, thereby suppressing or preventing the occurrence of cracks in the cast due to the tensile force.

Further, it is possible to suppress or prevent the central portion of the cast steel from being bulged and formed convexly by providing a pressing portion for pressing the center portion of the cast steel. Thus, the quality of the produced cast steel can be improved, and the failure occurrence rate can be reduced.

In addition, the temperature of the cast steel can be adjusted while measuring the cast steel temperature in real time. Therefore, it is easy to keep the temperature of the cast steel within the set temperature range, and the cast steel has a too low temperature, so that the cast steel can not have flexibility and cracks are generated or the cast steel is too hot to melt the cast steel.

In addition, by keeping the distance between the cast steel and the temperature regulator constant, various casts having different widths can be controlled in temperature under the same conditions. Therefore, the temperature of the cast steel can be easily adjusted. Thus, it is possible to prevent the heat generated by the temperature controller from being transmitted to the casting product, because the cast steel is too close to the cast steel and the cast steel is melted or the cast steel is too far from the temperature regulator.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic representation of the structure of a casting apparatus according to an embodiment of the present invention.
2 is a perspective view showing a cast steel defect preventing unit according to an embodiment of the present invention;
Fig. 3 is a front view showing the sponge defect prevention unit according to the embodiment of the present invention; Fig.
FIG. 4 is a front view showing a sponge defect prevention unit according to another embodiment of the present invention; FIG.
5 is a flowchart illustrating a casting method according to an embodiment of the present invention.
6 is a graph showing temperature changes at the upper and lower corners of the cast steel 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 will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. To illustrate the invention in detail, the drawings may be exaggerated and the same reference numbers refer to the same elements in the figures.

2 is a perspective view showing a cast steel defect preventing unit according to an embodiment of the present invention, and Fig. 3 is a perspective view showing a cast steel casting machine according to an embodiment of the present invention. Fig. 4 is a front view showing a sponge defect prevention unit according to another embodiment of the present invention. Fig.

Referring to FIG. 1, a casting apparatus according to an embodiment of the present invention includes a mold 20 into which molten steel is injected, a plurality of conveying rollers 20 which are located below the mold 20 and form a movement path of the cast S, (31), and a casting defects prevention (30) disposed between the conveying rollers (31) to regulate the temperature of at least a part of the edge portion of the cast (S) while pressing the casting (S) Unit 100 as shown in FIG.

The mold 20 may be a frame for determining the appearance of the gold product by solidifying the molten steel. The mold 20 has a pair of structurally opposed surfaces opened to form a hollow portion for receiving the molten steel supplied from the nozzle 15 of the tundish 10 arranged on the upper side. A cooling passage through which the cooling water can move can be formed inside the wall surface of the mold. Accordingly, the molten steel supplied into the mold 20 can be produced as the heat energy is taken up by the cooling water moving through the cooling channel and solidified.

The cooling stand 30 is disposed on the lower side of the mold 20. The cooling bed 30 is provided with a plurality of conveying rollers 30 arranged continuously to perform a series of forming operations while cooling the unfrozen casting S by forming a movement path of the casting S to be drawn to the lower portion of the casting mold 20, (31). In order to rapidly solidify the cast steel S, the injection nozzle 32 is provided in a part of the movement path of the cast steel S so that cooling water is sprayed on the upper and lower surfaces of the cast steel S and cooling water is supplied to both sides of the cast steel S It can be sprayed.

The movement path of the slab S formed by the cooling stand 30 may include a first straight section A, a curved section B and a second straight section C. [ The first straight section A is disposed below the mold 20 and extends in the vertical direction. The curved section B is connected to the first straight section A and has a curvature. The second straight line section C is connected to the curve section B and extends in a direction extending from the first straight section A. Therefore, the cast steel S can move through the first straight section A, the curved section B, and the second straight section C, respectively.

At this time, when the slab S passes the curved section B in the first straight section A or passes the second straight section C in the curved section B, defects may occur in the cast slab . That is, the surface of the main body passes through the point where the moving direction is switched, and the surface is flattened while being bent or bent. As a result, an excessive tensile force is generated on the upper surface or the lower surface of the cast steel, resulting in a defect that the surface is cracked at the corner portion of the cast steel. Therefore, it is possible to prevent the occurrence of defects in the cast steel S by providing the cast steel defect prevention unit 100. [

The spun-member defect prevention unit 100 is disposed at a point immediately before the start of the curve section B and immediately before the start of the second straight section C, respectively. Therefore, before the slab S passes the point where the section is changed, the slab defect prevention unit 100 supplies the heat energy to the edge portion of the slab S to set the temperature of the edge portion of the slab S to a predetermined set temperature Within a predetermined range. That is, the temperature of the corner portion of the cast steel can be locally controlled. Therefore, since the edge portions of the cast steel S to be solidified are in a flexible state, it is possible to prevent the surface of the cast steel S from cracking when bent or flattened.

2 and 3, the cast steel defect preventing unit 100 is provided on both sides of the cast steel S so as to be positioned on the moving path of the cast steel S and raise the temperature of the corner portion of the cast steel S And a plurality of temperature regulators 111 and 112 disposed between the plurality of temperature regulators 111 and 112. The temperature regulator 110 includes a plurality of temperature regulators 111 and 112 disposed on the upper and lower sides of the slab S, And a pressing portion 120 disposed on at least one of the two portions.

The slab defect prevention unit 100 further includes a driving unit 130 connected to the temperature regulators 111 and 112 to move the temperature regulators 111 and 112 in the width direction of the slab S, And a control unit 140 for controlling the operation of the temperature controller 110 and the driving unit 130 according to the temperature of the cast steel S and the width of the cast steel S, At this time, the cast steel S may move from the front to the rear, and the width direction may be the left and right direction intersecting with the moving direction of the cast steel.

The temperature regulating unit 110 may include a pair of temperature regulators 111 and 112 spaced apart from each other in the width direction of the slab S so as to surround the edge of the slab S. [ The temperature regulators 111 and 112 are disposed between the plurality of feed rollers 31 to regulate the temperature of the edge portion of the billet S moving along the cooling band 30. [ Thus, the temperature of the edge portion of the slab S can be adjusted while the slab S is being conveyed.

The temperature regulators 111 and 112 disposed at a position immediately before the start of the curve section B may be formed in an '?' Shape to wrap the lower edge of the slab S, and the second straight section C may be formed The temperature regulators 111 and 112 disposed at the point immediately before the formation of the slab S may be formed in an 'a' shape so as to surround the upper edge of the slab S.

That is, in the case of the cast steel S passing through the point where the curve is switched from the first straight section A to the curved section B, the upper surface is shortened in length and the length of the lower surface is increased. As a result, cracks can be easily generated due to the tensile force as the edges of the lower surface are stretched. In the case of the cast steel S passing through the point where the transition from the curved section B to the second straight section C is performed, the length of the upper surface may be increased while the lower surface may be made shorter while being flattened in the bent state. As a result, cracks are easily generated due to the tensile force as the edges of the upper surface are stretched.

Therefore, the temperature of the lower edge portion of the slab S is raised immediately before the transition from the first straight section A to the curved section B, and the temperature of the lower edge part of the slab S is changed from the curved section B to the second straight section C It is possible to raise the temperature of the upper edge portion of the slab S immediately before the occurrence of defects on the upper or lower edge portion of the cast slab. Thus, the temperature controllers 111 and 112 are arranged to supply the thermal energy only to the portions where the temperature of the slab S needs to be raised, thereby improving the space utilization and preventing the thermal energy from being wasted.

These temperature regulators 111 and 112 may be induction coil heaters having induction coils therein. When power is supplied to the induction coil in the temperature regulators 111 and 112, the induction coil generates heat to heat the edge portion of the slab S. However, the method of raising the temperature of the edge portion of the cast steel S is not limited thereto, and various methods such as hot wire and burner can be used.

The pressing portion 120 is disposed between a pair of temperature controllers 111 and 112 spaced apart in the width direction of the slab S. [ One or more pressing portions 120 may be arranged in a line along the conveying direction of the slab S. The pressing portion 120 may include at least one pressing roll 121 formed in a roller shape and arranged in a line, and a support 122 for rotatably supporting the pressing roll 121. The pressing roll 121 may be in contact with the upper surface or the lower surface of the center of the cast steel S and may be formed narrower than the conveying roller 31. [

The pressing portion 120 disposed at a position immediately before the start of the curve section B may be positioned below the slab S so as to contact the lower surface of the slab S and the second straight section C The pressing portion 120 disposed at a point just before the start may be positioned above the slab S so as to come into contact with the upper surface of the slab S. [ That is, the pressing portion 120 may be provided in a direction in which the temperature regulators 111 and 112 surround the slab S.

At this time, the conveying roller 31 may be disposed on the upper side or the lower side of the slab S in correspondence with the position of the pressing portion 120. Since the width of the feed roller 31 is larger than the separation distance of the pair of temperature controllers 111 and 112, it can not be disposed between the temperature controllers 111 and 112. The feed roller 31 may be disposed at a portion where the temperature regulators 111 and 112 are not wrapped so that the pressurizing portion 120 and the feed roller 31 press the upper and lower sides of the slab S. [

Even if the solidification layer at the center of the slab S tends to bulge up convexly due to the tilting force acting on the molten metal in the solidification layer S, the pressing portion 120 presses the center of the slab S, (S) can be kept flat. Therefore, it is possible to prevent defects becoming convex on the surface of the cast steel S from occurring. In addition, the support table 122 can be installed to be movable up and down. Thus, the pressing roll 121 can press the center of the cast steel S in accordance with the thickness of the cast steel S.

Meanwhile, the temperature controllers 111 and 112 and the pressing unit 120 may have different structures as shown in FIG. That is, the temperature regulators 111 and 112 may be formed in a 'C' shape so as to cover the entire side surface of the slab S, and the pressing portion 120 may be disposed both above and below the slab S .

The temperature regulators 111 and 112 include a first heater 111a 'arranged to surround the upper edge of the slab S and a second heater 111b' arranged to surround the lower edge of the slab S . When the upper edge of the cast steel S is heated, power is supplied only to the first heater 111a ', and when the lower edge of the cast steel S is heated, power is supplied only to the second heater 111b' When all the upper and lower edges of the cast steel S are heated, power can be supplied to both the first heater 111a 'and the second heater 111b'. That is, the first heater 111a 'and the second heater 111b' may operate independently of each other or separately.

Further, since the temperature regulators 111 and 112 surround the side surface of the slab S, the slab S can be prevented from being separated from the feeding path, and the slab S can be stably transported. In addition, the direction in which the temperature regulators 111 and 112 are installed may not be considered, regardless of the point just before the curve section B and the point just before the second straight section C, respectively. Therefore, the structure of the casting apparatus is simplified, and the maintenance of the casting apparatus can be facilitated. The pressing portion 120 disposed on the upper side and the lower side of the cast steel S can press the center of the cast steel S to prevent the central portion of the cast steel S from swelling. However, the structure and shape of the temperature controllers 111 and 112 are not limited to these, and may be various.

The driving unit 130 is provided with the temperature controllers 111 and 112 and is connected to the temperature controllers 111 and 112, respectively. The driving unit 130 may be a cylinder and may move the temperature regulators 111 and 112 left and right along the width direction of the slab S. [ Thus, by controlling the operation of the driving unit 130, the distance between the side surface of the cast steel S and the temperature controllers 111 and 112 can be adjusted. Therefore, even if the cast steel S is produced in various widths, the distance between the temperature regulators 111 and 112 and the side surface of the cast steel S can be always kept constant. However, the method by which the driving unit 130 moves the temperature controllers 111 and 112 is not limited to this, and may vary.

In addition, an auxiliary driving unit (not shown) for moving the temperature controllers 111 and 112 up and down may be provided. Thus, even if the thickness of the slab S varies, the distance between the upper surface or the lower surface of the temperature regulator 111 or 112 and the temperature regulator 111 or 112 can be kept constant. Since the edge portions of the slab S are always heated under the same conditions when the distance between the temperature regulators 111 and 112 and the slab S is kept constant, the temperature of the edge portion of the slab S is controlled Can be facilitated.

The control unit 140 controls the operation of the temperature control unit 110 and the driving unit 130 according to the temperature of the slab S and the moving distance of the temperature controllers 111 and 112. The control unit 140 is connected to a temperature measuring unit 156 for measuring the temperature of the slab S and a moving distance measuring unit 157 for measuring the moving distance of the temperature regulators 111 and 112, It is possible to transmit and receive the moving distance information of the temperature controllers 111 and 112. In addition, the controller 140 may be connected to an interval measurer 155 that measures the interval between the slab S and itself. At this time, the portion into which the slab S is introduced relative to the temperature regulators 111 and 112 may be forward, and the portion through which the slab S passes may be rearward.

The temperature measuring device 157 is disposed at the rear of the temperature regulating part 110 and at least one of the upper side and the lower side of the slab S, That is, the temperature measuring device 157 can measure the temperature of the upper or lower edge of the slab S passing through the temperature controllers 111 and 112. Thus, it is possible to monitor in real time whether or not the temperature of the edge portion of the slab S heated by the temperature regulators 111 and 112 is heated to within the preset temperature range through the temperature measuring device 156.

The temperature measuring device 156 may be disposed so as to be able to measure the temperature of the edge portion of the slab S and be spaced apart from each other in the width direction of the slab S. [ When the temperature controllers 111 and 112 adjust the temperature of the upper edge of the slab S, the temperature gauge 156 is disposed on the upper side of the slab S and the temperature regulators 111 and 112 adjust the temperature of the lower edge of the slab S The temperature measuring device 156 is disposed below the slab S. The pair of temperature gauges 156 can adjust the length of the gap S so as to measure the temperature of the corner portion of the slab S corresponding to the edge position of the slab S depending on the width of the slab S, . However, the number of the temperature measuring devices 156 is not limited to this and may vary.

The interval gauge 155 is disposed on the side of the slab S and measures the interval between the slab S and itself in the width direction. The interval gauge 155 is disposed in front of the temperature regulators 111 and 112 to measure the interval between itself and the slab S before passing through the temperature regulators 111 and 112. For example, the interval gauge 155 may be a laser sensor. Thus, the interval measuring device 155 can calculate the interval between itself and the slab S by measuring the time of returning the laser beam to the side of the slab S by oscillating the laser beam. The pair of interval gauges 155 may be provided to measure the interval between itself and the slab S on both sides of the slab S, respectively.

 Therefore, if the gap between the gap gauge 155 and the cast steel S becomes large, the width of the cast steel S becomes short, and if the gap between the gap gauge 155 and the cast steel S becomes short, It can be seen that it is long. However, the position of the gap measuring device 155, the method of measuring the gap, and the number of the gap measuring device 155 are not limited to this and may vary.

The movement distance measurer 157 may be installed in the driving unit 130 and may measure the movement distance of the temperature controllers 111 and 112 in the width direction. For example, the movement distance measurer 157 can indirectly measure the movement distance of the temperature controllers 111 and 112 by measuring a distance of movement of the rod of the driving unit 130 that moves the temperature controllers 111 and 112. The moving distance measuring device 157 is disposed on the same line as the moving direction of the slab S with respect to the gap measuring device 157 so that the measured value measured by the moving distance measuring device 157 and the measured value measured by the interval measuring device 155 Can be easily calculated.

That is, the distance measured between the temperature controllers 111 and 112 and the slab S can be calculated by subtracting the measured value from the movement distance measurer 157 from the measured value by the interval measurer 155 and adding a mechanical offset amount have. Thus, it is possible to monitor in real time whether the calculated value deviates from a predetermined set distance range. However, the method of confirming the position of the movement distance measuring device 157 and the moving distance of the temperature controllers 111 and 112 is not limited to this and may be various.

The control unit 140 includes a first transceiver connected to the temperature measuring unit 156, a determiner for determining whether the measured temperature value is within a preset temperature range, and a controller for controlling the operation of the temperature controller And a first controller. The controller 140 controls the temperature controller 111 and the temperature controller 112 in accordance with the width of the second transceiver and the slab S connected to the length measuring device 155 and the position measuring device 157, And a second controller for controlling the driving unit 130 so as to be spaced apart from each other.

The first transceiver is connected to the temperature measuring device 156 and transmits and receives temperature information of the corner portion of the slab S measured by the temperature measuring device 156. Thus, the temperature information of the slab S can be collected in real time through the first transceiver.

The determiner is connected to the first transceiver and serves to compare the temperature of the edge portion of the slab S with a predetermined set temperature range. At this time, the set temperature range may vary depending on the steel type of the cast steel S, and the set range temperature may be determined between the casting temperature of the cast steel S and the melting temperature. That is, the setting range temperature is higher than the embrittling temperature of the cast steel S and lower than the melting temperature.

When the temperature of the slab S is lower than the embrittling temperature, a crack may occur on the surface of the slab S when the slab S is kept in a rigid state and is bent or spread. Further, when the temperature of the cast steel S is higher than the melting temperature, there may occur a problem that the cast steel S is melted and torn. Therefore, it is necessary to judge whether the temperature of the edge portion of the slab S is within the set temperature range so that the slab S has flexibility and does not melt.

The first controller is connected to the determiner and controls the operation of the temperature controllers 111 and 112 according to the determination of the determiner. That is, if the judging unit judges that the temperature of the slab S is within the temperature setting range, the first controller does not change the heating temperature of the slab S of the temperature regulators 111 and 112. When the judging unit determines that the temperature of the slab S is lower than the temperature setting range, the first controller raises the slab S heating temperature of the temperature regulators 111 and 112 so that the temperature of the slab S is adjusted within the temperature setting range Can be controlled. If the judging unit determines that the temperature of the slab S is higher than the temperature setting range, the first controller lowers the slab S heating temperature of the temperature regulators 111 and 112 so that the temperature of the slab S is higher than the temperature of the slab S It can be controlled so as to be controlled within the temperature setting range.

Therefore, the temperature of the edge portion of the slab S can be always controlled within the set temperature range. Thus, the slab S can be made flexible so as to prevent cracks from being generated on the surface of the slab S while preventing the slab S from being melted.

The second transceiver is connected to an interval measurer 155 and a movement distance measurer 157. Accordingly, the interval information between the interval gauge 155 and the slab S and the moving distance information of the temperature controllers 111 and 112 can be collected in real time through the second transceiver.

The second controller is connected to the second transceiver and controls the operation of the driving unit 130. The second controller may control the temperature controllers 111 and 112 to be spaced apart from the sides of the slab S by a predetermined distance after confirming the positions of the temperature controllers 111 and 112 even if the width of the slab S varies. Therefore, since the heating conditions of the slab S via the temperature regulators 111 and 112 can always be made identical, it becomes easier to control the temperature of the slab S.

At this time, an operator may be provided to calculate the measured value measured by the gap measuring device 155 and the measured value measured by the moving distance measuring device 157 to measure the separation distance between the temperature adjusting devices 111 and 112 and the slab S have. The set distance value may vary depending on the steel type of the steel strip S, and may be a range in which the steel strips 111 and 112 stably heat the steel strip S. That is, if the distance between the temperature regulators 111 and 112 and the slab S is too close to each other, the temperature regulators 111 and 112 may come into contact with the slab S and break or the slab S may melt. Conversely, if the distance between the temperature controllers 111 and 112 and the cast steel S is too large, the temperature controllers 111 and 112 may not be able to control the temperature of the cast steel S.

Therefore, after comparing the calculated value of the operation unit with the set distance range, the temperature adjusters 111 and 112 can be moved so that the calculated value is within the set distance range. The second controller can keep the distance between the temperature regulators 111 and 112 and the slab S constant.

As described above, just before the slab S moves along the second straight section C in the first straight section A or the curved section B or the curved section B, It is possible to raise the temperature of the edge portion of the substrate S. Thus, when the cast steel S passes through the section where the path is switched, the corner portion of the cast steel S is made flexible, so that cracking of the cast steel S due to the tensile force can be suppressed or prevented. It is also possible to suppress or prevent the central portion of the slab S from being bulged and formed convexly by providing the pressing portion 120 for pressing the center portion of the slab S. Thus, the quality of the produced cast steel S is improved, and the failure occurrence rate can be reduced.

In addition, the temperature of the slab S can be adjusted while measuring the temperature of the slab S in real time. Therefore, it is easy to keep the temperature of the cast slab S within the set temperature range and the temperature of the slab S is too low to cause the cast slab S not to have flexibility, It is possible to prevent the molten resin from melting.

Also, by keeping the distance between the cast steel S and the temperature regulators 111 and 112 constant, the temperature of the various casts having different widths can be controlled under the same conditions. Therefore, the temperature of the slab S can be easily adjusted. The reason for this is that the temperature of the slab S is too close between the slab S and the temperature regulators 111 and 112 or the slab S is too far between the slab S and the temperature regulators 111 and 112, ) Can be prevented from being not properly transmitted.

FIG. 5 is a flow chart showing a casting method according to an embodiment of the present invention, and FIG. 6 is a graph showing temperature changes on the upper and lower surfaces of the cast steel according to the embodiment of the present invention.

Hereinafter, a casting method according to an embodiment of the present invention will be described.

A casting method according to an embodiment of the present invention includes a process of drawing a cast steel by injecting molten steel into a casting mold, a process of adjusting the temperature of a corner portion of the casting mold moving along the movement path at a plurality of positions, Wherein the temperature of the corner portion of the casting is controlled at least at any one of before, during, or after the temperature of the corner portion of the casting has been adjusted, And adjusting the distance between the regulator and the casting spindle.

Referring to FIG. 5, the process of adjusting the separation distance between the temperature regulator and the cast steel may include a step S110 of measuring the interval between the interval gauge and the cast steel to measure the interval, a step S120 of measuring the moving distance of the temperature regulator (S140) of calculating a distance between the temperature regulator and the cast steel by calculating the interval and the movement distance, checking whether the calculated value is within a predetermined set distance range (S140), and And moving the temperature controller when the calculated value is out of the set distance range (S150).

First, molten steel supplied to the mold 20 is conveyed along the conveying roller 31 of the cooling stand 30 while being drawn downward. The feed path of the slab S formed by the cooling stand 30 may include a first straight section A, a curved section B, and a second straight section C. At this time, at the point just before the transition from the first straight section A to the curved section B and before the transition to the second straight section C from the curved section B, Can be installed.

Then, the temperature adjusters 111 and 112 of the cast steel defect prevention unit 100 can be moved before the cast steel S reaches the place where the cast steel defect prevention unit 100 is disposed. That is, when the spacing distance between the pair of temperature regulators 111 and 112 is shorter than the width of the slab S, the moving slab S may collide with the temperature regulators 111 and 112. Therefore, in order to prevent the slab S and the temperature controllers 111 and 112 from colliding with each other, the separation distance of the pair of temperature controllers 111 and 112 can be adjusted before the slab S moves along the cooling stand 30. [

For example, the cast slab S is drawn in accordance with the width of the casting mold 20. Therefore, after the width information of the mold 20 (or the initial width information of the casting) is measured in advance, the temperature regulators 111 and 112 are controlled so that the distance between the pair of temperature regulators 111 and 112 is larger than the width of the mold 20. [ .

Then, when the slab S moves along the conveying roller 31 and reaches the position where the slab prevention unit 100 is disposed, the interval gauge 155 first measures the interval between the slab S and itself. The temperature controller 111 or 112 may be moved by controlling the driving unit 130 such that the temperature controller 111 or 112 is spaced apart from the slab S by a predetermined distance.

Then, the moving distance measuring device 157 measures the moving distance of the temperature controllers 111 and 112 in the width direction. The measured value of the movement distance measurer 157 may be calculated with the value measured by the interval measurer 155 to calculate the separation distance between the temperature regulators 111 and 112 and the slab S. [ For example, if the mechanical offset value is added after subtracting the measured value from the movement distance measuring device 157 from the value measured by the interval measuring device 155, the distance between the temperature regulating devices 111 and 112 and the slab S is calculated .

 Then, it is possible to confirm whether the calculated value is within a predetermined set distance range. It is possible to bring the temperature controllers 111 and 112 close to the slab S by adjusting the positions of the temperature controllers 111 and 112 if the separation distance between the slab S and the temperature controllers 111 and 112 is larger than the set distance range. On the contrary, if the value of the separation distance between the slab S and the temperature controllers 111 and 112 is smaller than the set distance range, the temperature controllers 111 and 112 are adjusted to move the temperature controllers 111 and 112 from the slab S to a remote position .

Even if the width of the slab S varies, the temperature controllers 111 and 112 may be controlled to be spaced apart from the side surface of the slab S by a predetermined distance after the positions of the temperature controllers 111 and 112 are confirmed. Therefore, since the heating conditions of the slab S via the temperature regulators 111 and 112 can always be made identical, it becomes easier to control the temperature of the slab S. The set distance value may vary depending on the steel type of the steel strip S, and may be a range in which the steel strips 111 and 112 stably heat the steel strip S.

Next, a process of adjusting the temperature of the edge portion of the casting which moves along the movement path at a plurality of positions, and a process of pressing the center portion of the casting of the temperature controlled region can be performed. The process of pressing the center of the casting may be performed simultaneously or the process of adjusting the temperature of the corner of the casting may be performed after pressing the center of the casting It is possible.

Referring to FIG. 5, the process of adjusting the temperature of the corner portion of the cast steel may include heating the corner portion of the cast steel (S210), measuring the temperature of the edge portion of the heated cast steel (S220) (S230) of checking whether the measured temperature value is within a predetermined set temperature range, and adjusting the temperature of the casting piece when the measured temperature value is out of the set temperature range.

When the temperature regulators 111 and 112 are maintained at a constant distance from the slab S, the temperature of the edge portion of the slab S can be controlled by using the temperature regulators 111 and 112. For example, the edge portion of the cast steel S can be heated to raise the temperature of the edge portion of the cast steel S.

In the case of the cast strip S passing through the point where the curve is switched from the first straight line section A to the curved section B, the upper surface is shortened in length and the length of the lower surface is increased. As a result, cracks can be easily generated due to the tensile force as the edges of the lower surface are stretched. In the case of the cast steel S passing through the point where the transition from the curved section B to the second straight section C is performed, the length of the upper surface may be increased while the lower surface may be made shorter while being flattened in the bent state. As a result, cracks are easily generated due to the tensile force as the edges of the upper surface are stretched.

Therefore, the temperature of the lower edge portion of the slab S is raised immediately before the transition from the first straight section A to the curved section B, and the temperature of the lower edge part of the slab S is changed from the curved section B to the second straight section C It is possible to raise the temperature of the upper edge portion of the slab S immediately before the occurrence of defects on the upper or lower edge portion of the cast slab.

Then, the temperature of the edge portion of the slab S having passed through the temperature regulators 111 and 112 can be measured by using the temperature measuring device 156. Then, it is possible to confirm whether the measured temperature value is within the preset temperature range. The set temperature range may vary depending on the steel type of the cast steel S, and the set range temperature may be determined between the casting temperature and the melting temperature of the cast steel S, for example. That is, the setting range temperature is lower than the embrittling temperature of the cast steel S and lower than the melting temperature.

More specifically, the upper limit of the set range temperature may be a temperature obtained by subtracting 50 degrees Celsius or 100 degrees Celsius from the melting temperature. That is, when the edge portion of the cast steel S is heated close to the melting temperature, the temperature of the center portion of the cast steel S may rise and exceed the melting temperature. Accordingly, the center of the cast steel S may be melted and torn. Therefore, the temperature of the edge portion of the slab S can be heated to a much lower melting temperature in consideration of the temperature rise in the central portion of the slab S. [ However, the set temperature range is not limited to this and may vary.

When the temperature of the slab S is lower than the embrittling temperature, a crack may be generated on the surface of the slab S when the slab S is kept in a rigid state and is bent or spread. Further, when the temperature of the cast steel S is higher than the melting temperature, there may occur a problem that the cast steel S is melted and torn. Therefore, it is necessary to judge whether the temperature of the edge portion of the slab S is within the set temperature range so that the slab S has flexibility and does not melt.

If the measured temperature of the slab S is within the temperature setting range, the heating temperature of the slab S of the temperature regulators 111 and 112 is not changed. If the measured temperature of the slab S is lower than the temperature setting range, the temperature of the slab S of the temperature regulators 111 and 112 can be raised to control the temperature of the slab S to be within the temperature setting range. On the other hand, when the temperature of the slab S is higher than the temperature setting range, the temperature of the slab S of the temperature regulators 111 and 112 is lowered to control the temperature of the slab S to be within the temperature setting range of the slab S .

Therefore, the temperature of the edge portion of the slab S can be always controlled within the set temperature range. Thus, the slab S can be made flexible so as to prevent cracks from being generated on the surface of the slab S while preventing the slab S from being melted.

As shown in FIG. 6, the temperature of the upper edge portion and the temperature of the lower edge portion of the moving billet S were measured according to the embodiment of the present invention. 6 (a) is a graph showing the temperature change of the lower edge portion of the cast steel S with the movement of the cast steel S, and FIG. 6 (b) S in Fig.

6 (a), the temperature of the lower edge portion of the slab S immediately before the transition from the first straight section A to the curved section is lower than the embrittling temperature and the melting temperature by the temperature controllers 111, 112 Can be seen. Therefore, when the cast steel S is bent over the curve section B in a flat state, the lower edge of the cast steel S becomes flexible, and defects can be prevented from occurring due to the tensile force.

6B, when the temperature of the upper edge portion of the slab S is raised by the temperature regulators 111 and 112 to below the embrittling temperature and the melting temperature just before switching to the second straight section in the curved section can see. Thus, when the cast steel S is flattened beyond the second straight section C in a bent state, the upper edge of the cast steel S becomes flexible, and defects can be prevented from being generated by the tensile force.

At this time, even if the solidification layer in the central portion of the slab S tends to bulge up convexly due to the tilting force acting on the molten metal in the solidification layer S, the pressing portion 120 presses the central portion of the slab S, (S) can be kept flat. Therefore, it is possible to prevent defects becoming convex on the surface of the cast steel S from occurring.

As described above, just before the slab S moves along the second straight section C in the first straight section A or the curved section B or the curved section B, It is possible to raise the temperature of the edge portion of the substrate S. Thus, when the cast steel S passes through the section where the path is switched, the corner portion of the cast steel S is made flexible, so that cracking of the cast steel S due to the tensile force can be suppressed or prevented. It is also possible to suppress or prevent the central portion of the slab S from being bulged and formed convexly by providing the pressing portion 120 for pressing the center portion of the slab S. Thus, the quality of the produced cast steel S is improved, and the failure occurrence rate can be reduced.

In addition, the temperature of the slab S can be adjusted while measuring the temperature of the slab S in real time. Therefore, it is easy to keep the temperature of the cast slab S within the set temperature range and the temperature of the slab S is too low to cause the cast slab S not to have flexibility, It is possible to prevent the molten resin from melting.

Also, by keeping the distance between the cast steel S and the temperature regulators 111 and 112 constant, the temperature of the various casts having different widths can be controlled under the same conditions. Therefore, the temperature of the slab S can be easily adjusted. The reason for this is that the temperature of the slab S is too close between the slab S and the temperature regulators 111 and 112 or the slab S is too far between the slab S and the temperature regulators 111 and 112, ) Can be prevented from being not properly transmitted.

Although the present invention has been described in detail with reference to the specific embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be defined by the appended claims, as well as the appended claims.

100: casting defects prevention unit 110: temperature control unit
120: pressing portion 130:
140: control unit 155:
156: Temperature measuring instrument 157: Position measuring instrument

Claims (19)

A temperature regulating unit located on a traveling path of the casting and having a plurality of temperature regulators respectively disposed on both sides of the casting so as to raise the temperature of a corner portion of the casting; And
A pressing portion located between the plurality of temperature regulators and disposed on at least one of the upper side and the lower side of the casting so as to press the central portion of the casting; (2). The method according to claim 1,
And a driving unit connected to the temperature regulator to move the temperature regulator in the width direction of the cast steel. The method of claim 2,
And a control unit for controlling the operation of the temperature regulating unit and the driving unit according to the temperature of the casting and the moving distance of the temperature regulator. The method of claim 3,
And a temperature measuring device disposed on at least one of the upper side and the lower side of the casting and measuring the temperature of the casting. The method of claim 4,
The control unit may include a first transceiver connected to the temperature measuring unit, a determiner determining whether the measured temperature value is within a preset temperature range, and a second controller controlling the operation of the temperature controller according to the determination of the determiner. And a control unit. The method according to any one of claims 3 to 5,
An interval measuring device disposed on a side surface of the casting and measuring an interval between the casting and the casting, and a movement distance measuring device measuring a moving distance in the width direction of the temperature regulating device. The method of claim 6,
Wherein the control unit includes a second transceiver connected to the movement distance measuring unit and the gap measuring unit, and a second controller for controlling the driving unit such that the temperature regulator is spaced apart from the casting by a predetermined distance. The method according to any one of claims 1 to 5,
Wherein the pressing portion includes a pressing roll,
Wherein the temperature regulator includes at least one of a heat wire, an induction coil heater, and a burner. A mold into which molten steel is injected;
And a plurality of conveying rollers located below the mold and forming a movement path of the casting to be withdrawn; And
A casting defect preventing unit disposed between the conveying rollers to pressurize the casting and adjust the temperature of at least a part of the edge of the casting; Including casting equipment. The method of claim 9,
Wherein the movement path includes a first straight section, a curved section, and a second straight section, and the gable piece defect prevention unit is disposed at a position immediately before the start of the curved section and immediately before the start of the second straight section Casting device. The method of claim 10,
Wherein at least a part of the casting defect preventing unit disposed at a position immediately before the start of the curved section is formed so as to surround the lower edge of the casting,
Wherein at least a part of the casting defect preventing unit disposed at a position immediately before the start of the second straight section is formed so as to surround the upper edge of the casting. The method of claim 10,
At least a part of the gable piece defect prevention unit is formed so as to surround the side surface of the cast steel,
Wherein the temperature regulator includes a first heater arranged to surround an upper edge of the cast steel, and a second heater arranged to surround the lower edge of the cast steel. The method according to any one of claims 9 to 12,
Wherein the cast steel flaw unit includes a temperature regulator having a plurality of temperature regulators respectively disposed on both sides of the cast steel so as to raise the temperature of the corner portion of the cast steel, And a pressurizing portion disposed on at least one of the upper side and the lower side of the casting to press the casting. A process in which molten steel is injected into a mold to draw out the cast;
Adjusting a temperature of a corner portion of the casting which moves along the movement path at a plurality of positions;
Pressing the center of the bobbin of the temperature controlled region; Including casting methods. 15. The method of claim 14,
Wherein the moving path includes a first straight line section, a curved section, and a second straight line section, wherein the temperature of the corner section of the casting is changed to a local temperature at a point immediately before the curved section starts and immediately before the second straight line section starts . 15. The method of claim 14,
The process of adjusting the temperature of the corner portion of the casting may include:
Heating the corner portion of the casting;
Measuring the temperature of the edge portion of the heated casting;
Checking whether the measured temperature value is within a preset temperature range; And
Adjusting the temperature of the casting piece when the measured temperature value is out of the set temperature range; Including casting methods. 18. The method of claim 16,
Wherein the set temperature range is not less than the embrittling temperature of the cast steel, and less than the melting temperature of the cast steel. The method according to any one of claims 14 to 17,
A temperature controller for adjusting a temperature of a corner portion of the cast steel at least at any one of before, during, and after the temperature of the corner of the cast steel; and adjusting a separation distance of the cast steel Further comprising a casting method. 19. The method of claim 18,
Wherein the step of adjusting the distance between the temperature controller and the casting comprises:
Measuring an interval between the interval gauge measuring the interval and the casting;
Measuring a moving distance of the temperature regulator;
Calculating a distance between the temperature regulator and the slab by calculating the gap and the moving distance;
Checking whether the calculated value is within a predetermined set distance range; And
And moving the temperature controller when the calculated value is out of a set distance range; Including casting methods.
KR1020150103074A 2015-07-21 2015-07-21 Unit for Preventing Surface Defects of Slab, Casting Apparatus having the same, and Casting Method KR101719514B1 (en)

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KR102659026B1 (en) * 2022-11-23 2024-04-18 현대제철 주식회사 Continuous casting device for crack prevention

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