KR20160046381A - Method and apparatus for continuous casting - Google Patents

Method and apparatus for continuous casting Download PDF

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Publication number
KR20160046381A
KR20160046381A KR1020140141769A KR20140141769A KR20160046381A KR 20160046381 A KR20160046381 A KR 20160046381A KR 1020140141769 A KR1020140141769 A KR 1020140141769A KR 20140141769 A KR20140141769 A KR 20140141769A KR 20160046381 A KR20160046381 A KR 20160046381A
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KR
South Korea
Prior art keywords
rotational speed
rolls
driving
drive
roll
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KR1020140141769A
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Korean (ko)
Inventor
권상흠
원영목
신기태
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주식회사 포스코
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Priority to KR1020140141769A priority Critical patent/KR20160046381A/en
Publication of KR20160046381A publication Critical patent/KR20160046381A/en

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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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/043—Curved moulds
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0628—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by more than two casting wheels
    • 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
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • 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
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • 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
    • 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
    • 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
    • B22D11/208—Controlling or regulating processes or operations for removing cast stock for aligning the guide rolls

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

Abstract

The present invention provides a continuous casting machine comprising a mold, a plurality of drive rolls, and a controller capable of controlling the speed of each of the plurality of drive rolls, a process of drawing a casting from the mold, And controlling the speed to apply a compressive stress to the cast steel in a direction in which the cast steel is to be pulled out. The continuous casting method includes the steps of controlling the rotational speed of each of a plurality of drive rolls for casting a cast steel during casting, A continuous casting method and a continuous casting apparatus capable of casting a cast steel having excellent surface quality by applying a compressive stress and suppressing or preventing occurrence of cracks on the surface of the cast steel are proposed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a continuous casting method,

TECHNICAL FIELD The present invention relates to a continuous casting method and a continuous casting apparatus, and more particularly, to a continuous casting method capable of casting a cast steel having excellent surface quality and a continuous casting apparatus applied thereto.

The continuous casting process is a process in which refined molten steel is supplied and cast into a cast steel. During casting of a cast steel in a continuous casting process, tensile stress and deformation applied to the cast steel during concentration of the cast steel are concentrated on a weak portion of the cast steel caused by formation of a solidification layer in the casting mold and crack sensitivity of the steel grade, May occur. The cracks on the surface of the cast steel remain as defects on the cast steel surface at the time of rolling the cast steel.

Conventionally, surface cracks of the cast steel were removed by a correction process such as scarfing at the casting stage. However, as described above, the method of correcting the cast steel at the casting stage has a problem that the productivity of the casting process is lowered, such as increasing the process time and delaying the supply of the cast steel to the rolling process.

Also, in the conventional continuous casting process, by utilizing the information of the reduction ratio of area (RA) of the casting according to the temperature of the casting casting, it is possible to prevent the casting of castings in the temperature range, The cracking and propagation on the surface of the slab was suppressed by controlling the cooling conditions of the slab. However, in the case of casting a steel having a low section shrinkage value in a wide temperature range due to the addition of various metal elements to steel for the production of high-grade steel satisfying high strength, light weight, . That is, it is difficult to set a temperature region except for the temperature region, which is low in cracking occurrence due to low cross-sectional shrinkage rate of each steel type to which various metal elements are added, as the temperature condition at the casting and apply it to each continuous casting process.

Therefore, there is a need for a new method capable of suppressing or preventing the generation of cracks on the surface of the cast steel in a manner different from the conventional one.

On the other hand, the technology as the background of the present invention is disclosed in Korean Patent Registration No. 10-1439620 (Apr.

KR 10-1439620 B1

The present invention provides a continuous casting method and a continuous casting apparatus capable of casting a cast steel having excellent surface quality by suppressing or preventing occurrence of cracks on the surface of cast steel during casting of the cast steel.

The present invention provides a continuous casting method and a continuous casting apparatus capable of suppressing or preventing occurrence of cracks on the surface of a cast steel by applying compressive stress to the cast steel during casting the cast steel.

The present invention provides a continuous casting method and a continuous casting apparatus capable of controlling the rotational speed of each of a plurality of drive rolls that pull out a casting product while casting the casting product to apply compressive stress to the cast product.

A continuous casting method according to an embodiment of the present invention includes the steps of: providing a continuous casting apparatus having a mold, a plurality of drive rolls, and a controller capable of controlling the speed of each of the plurality of drive rolls; Withdrawing a casting from the casting mold; And controlling the rotational speed of each of the driving rolls to apply compressive stress to the strip in a direction in which the main strip is pulled out.

Wherein the step of applying the compressive stress to the cast slabs includes the step of moving each of the plurality of drive rolls so that the rotational speed of the preceding drive roll preceding the main slope with respect to the direction in which the main slab is pulled out is greater than the rotational speed of the following drive roll, And controlling the rotation speeds at different rotational speeds.

The plurality of driving rolls may be controlled at different rotational speeds so that the degree of change in rotational speed between the preceding driving roll and the trailing driving roll is equal to each other in a direction in which the main cutting edge is pulled out.

The plurality of drive rolls may be controlled at different rotational speeds so that the degree of change in the rotational speed between the preceding drive roll and the following drive roll increases or decreases in the direction in which the main lead is extracted.

When the intermediate value between the rotational speed of the drive roll located on the inner side and the rotational speed of the drive roll located on the outer side among the plurality of drive rolls is V, the rotational speed VI of the drive roll located inside of the plurality of drive rolls And the rotational speed VO of the driving roll located on the outer side is the unbending section of the main spindle

VI = V = VO.

Wherein the controlling each of the plurality of driving rolls at different speeds comprises:

When V N + 1 = V N + V N * a, N = 1, 2, 3, ...,

In the unbending period of the main spindle, the plurality of driving rolls are controlled at different rotational speeds by using [Equation 1], where a is

0.002? A? 0.02,

Here, N is the position of each of the plurality of drive rolls spaced from each other in the direction in which the main strip is pulled out, and the larger the value, the closer to the mold.

When the intermediate value between the rotational speed of the drive roll located on the inner side and the rotational speed of the drive roll located on the outer side among the plurality of drive rolls is V, the rotational speed VI of the drive roll located inside of the plurality of drive rolls And the rotational speed VO of the driving roll located on the outer side of the bending section

VI < V < VO.

The process of controlling each of the plurality of drive rolls at different speeds may include the steps of: determining a position of each of the plurality of drive rolls spaced from each other in a direction in which the main strip is pulled out, Location,

V N + 1 = (k I * V N ) + (k I * V N ) * a, N = 1, 2, 3, ...

[Expression 3] when the VO N + 1 = (k O * V N) + (k O * V N) * a, N = 1, 2, 3, ...,

In the bending section of the cast steel, each of the drive rolls located at the inner side among the plurality of drive rolls is controlled at different rotational speeds by using [Equation 2], and the outermost one of the plurality of drive rolls Control each of the positioned driving rolls at different rotational speeds, wherein a, k I, and k O are

0.002? A? 0.02, and k I <1 <k O ,

Here, N is the position of each of the plurality of drive rolls spaced from each other in the direction in which the main strip is pulled out, and the larger the value, the closer to the mold.

A continuous casting apparatus according to an embodiment of the present invention is a continuous casting apparatus that receives molten steel and casts the molten steel into a cast steel, comprising: a casting mold for forming a passage through which molten steel passes; A plurality of drive rolls spaced apart from each other in a pull-out direction of the cast steel so as to be able to pull out the cast steel to a lower side of the cast steel; A driving roll motor connected to each of the plurality of driving rolls to control respective rotational speeds; And a controller for controlling a rotational speed of each of the plurality of driving rolls so that a compressive stress is applied to the cast strip in a direction in which the main strip is pulled out.

Wherein the controller includes: a storage unit for storing information on a steel strip casting speed of molten steel and information on a rotating speed of a reference driving roll corresponding to the steel strip drawing speed information; Wherein the rotating speed of the preceding driving roll, which is relatively close to the mold, of the plurality of driving rolls is greater than the rotating speed of the trailing driving roll, which is a position relatively far from the mold, An operation unit for calculating a rotation speed of each of the plurality of drive rolls; And a controller for controlling the rotational speed of each of the plurality of driving rolls by controlling outputs of the driving roll motors connected to the plurality of driving rolls so as to follow the rotational speeds of the plurality of driving rolls calculated by the calculating unit can do.

Wherein the arithmetic unit calculates the rotational speed of the preceding driving roll based on the rotational speed of the preceding driving roll so that each of the plurality of driving rolls is controlled at a different rotational speed, The rotational speed of the following driving roll may be respectively calculated so as to increase within a range of 0.2% to 2% with respect to the rotational speed of the roll.

The calculating unit may calculate the rotational speed of each of the plurality of drive rolls so that the rotational speed ratio of the rotational speed of the preceding drive roll and the rotational speed of the following drive roll is constant with respect to the direction in which the main track is pulled out.

Wherein the arithmetic unit calculates the rotational speed of each of the plurality of drive rolls so that the rotational speed ratio of the rotational speed of the preceding drive roll and the rotational speed of the following drive roll increases with respect to the direction in which the main lead is pulled out, The rotation speed of each of the plurality of drive rolls may be calculated.

Wherein the calculation unit calculates the rotation speed so that the rotation speeds of the drive rolls positioned on the inner side and the drive rolls positioned on the outer side of the plurality of drive rolls are equal to each other in the unbending interval of the main spindle, The rotational speed can be calculated so that the rotational speed of the driving roll located outside the rotational speed of the driving roll located inside of the two driving rolls is large.

According to the embodiment of the present invention, compressive stress can be applied to the cast steel by controlling the respective rotational speeds so that the rotational speeds of the plurality of drive rolls drawing the cast steel during the casting of the cast steel are different. More specifically, the rotational speed of each of a plurality of drive rolls is controlled so that the rotational speed of a relatively preceding drive roll among a plurality of drive rolls is greater than a rotational speed of a drive roll relatively following A compressive stress can be applied. From this, it is possible to suppress or prevent occurrence of cracks due to tensile stress on the surface of the cast steel, and cast a cast steel having excellent surface quality.

Further, according to the embodiment of the present invention, the rotational speed of each of the plurality of drive rolls sequentially disposed in the direction from the reference drive roll toward the mold during casting of the cast steel is sequentially increased within the range of 0.2% to 2% It is possible to apply a predetermined compressive stress to the billet between the preceding drive roll and the following drive roll. Therefore, it is possible to effectively suppress or prevent the occurrence of cracks on the surface of the cast steel even when casting a steel grade to which a predetermined alloy element is added to lower the value of the sectional shrinkage ratio (RA) in a temperature range susceptible to cracking. This makes it possible to relax the control level of the temperature condition at the time of casting, even when the step of continuously casting a predetermined steel species, which is low in cracking occurrence due to a low value of the sectional shrinkage rate, is performed.

Further, according to the embodiment of the present invention, generation of cracks on the surface of the cast steel can be suppressed or prevented, and a correction process such as scarfing, which was conventionally performed in the casting step, can be omitted. From this, it is possible to improve the process productivity by reducing the process time of the whole process and smooth supply of the billet to the rolling process, thereby reducing the process cost and the product delivery date.

1 is a schematic view of a continuous casting apparatus according to an embodiment of the present invention;
2 and 3 are partial schematic views of a continuous casting apparatus for explaining a continuous casting method according to an embodiment of the present invention.
FIG. 4 is a table for explaining the results obtained by varying the rotational speed increasing rate of the driving roll in the continuous casting process using the continuous casting method according to the embodiment of the present invention. FIG.
FIG. 5 is a graph for explaining a change in a cross-sectional shrinkage rate of a steel material to be treated in a continuous casting process to which an embodiment of the present invention is applied. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, but may be embodied in various forms. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. The drawings may be exaggerated in size to illustrate embodiments, and like reference numerals in the drawings designate like elements.

1 is a schematic view showing a continuous casting apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a continuous casting apparatus according to an embodiment of the present invention is a continuous casting apparatus for continuously supplying refined molten steel into a cast steel, and includes a ladle 110 containing refined molten steel, a ladle 110 A tundish 120 for temporarily storing molten steel to be introduced, a mold 130 for supplying molten steel from the tundish 120 and casting the molten steel into a cast steel, and strands. The mold 130 is formed with a passage through which molten steel can pass, and molten steel passes through the mold 130 and solidifies into a predetermined shape. The strands are provided with a plurality of segments, and the plurality of segments are continuously arranged in one direction to form a path through which the main yarn is pulled out. Molten steel passing through the mold 130 and solidifying in a predetermined shape passes through a plurality of segments and is secondarily cooled and pressed down and cast into a cast steel.

A plurality of driving rolls 140 spaced apart from each other in the thickness direction of the casting sheet and spaced apart from each other in a direction in which the casting strips are pulled out so that the casting strips can be pulled out to the lower side of the casting mold 130, A driving roll motor 150 connected to each of the driving rollers 140 to control the rotation speed of the driving rollers 150 to adjust the output of the driving roll motor 150 so that compressive stress is applied to the strips in the direction in which the main strips are pulled out, A controller 160 may be provided to control the rotation speed of each of the first and second motors.

Although not shown in the drawing, the segments of the continuous casting apparatus are continuously disposed in the direction in which the casting pieces are pulled out so as to be able to guide the casting pieces drawn to the lower side of the casting mold 130 by the driving roll 140, A plurality of pinch rolls spaced apart from each other in the drawing direction and a plurality of pinch rolls spaced apart from each other at a plurality of positions spaced from each other in the thickness direction and the drawing direction so as to secondarily cool the castings continuously withdrawn to the lower side of the casting mold 130 (Not shown) for spraying the cooling water toward the cooling water supply pipe (not shown).

The ladle 110, the tundish 120, the mold 130, the drive roll 140, and the drive roll motor 150 are not limited to any particular configuration and manner, May be varied. Therefore, detailed description of these components will be omitted so as not to obscure the gist of the present invention.

The controller 160 is a component provided to control the rotation speed of the driving roll 140 by controlling the output of the driving roll motor 150. The controller 160 is a detailed component that is configured to calculate the pulling speed information of the casting corresponding to the process conditions such as the desired steel type and the rotation speed of the reference drive roll corresponding to the pulling speed information of the casting so that the casting can be cast at a desired pulling- The rotational speed of the preceding driving roll provided at a position relatively close to the mold 130 in each of the plurality of driving rolls 140 is located at a position relatively far from the mold 130 An arithmetic unit 162 for calculating the rotational speed of each of the plurality of drive rolls based on the rotational speed information of the reference drive roll that is input to the storage unit 161 so as to be greater than the rotational speed of the following drive roll, Controls the rotation speed of each of the plurality of driving rolls 140 by controlling the output of the driving roll motor 150 connected to each of the plurality of driving rolls 140 so as to follow the rotation speed of each of the calculated driving rolls 140 doing It may include a fisherman 163.

The storage unit 161 stores information on the rotational speed of the reference driving roll corresponding to the steel type of the molten steel, and stores rotational speed information of the reference driving roll corresponding to the molten steel type in the continuous casting process, (162).

Here, the reference drive roll refers to a drive roll that is a reference for controlling the rotation speed of drive rolls disposed within a banding section and an unbending section, which will be described later. When any one of the plurality of drive rolls 140 is selected as the reference drive roll . Although not shown in the drawings, in the embodiment of the present invention, it is exemplified that the driving roll located at the rear end of the unbending section to be described later is selected as the reference driving roll. However, the selection of the reference drive roll can be variously changed, and any one of the drive rolls in a position that is later than the drive roll pulling out the strip at the position corresponding to the vulnerability of the cast steel, which is susceptible to surface crack generation and propagation, It is selectable by roll. For example, among the plurality of driving rolls disposed apart from each other in the direction in which the main strips are pulled out, the driving rolls that are the longest distance from the mold 130 can be selected as the reference driving rolls, have. Alternatively, a drive roll may be selected as the reference drive roll for pulling out the casting at a predetermined position of the rear end of the casting fragile portion so as to selectively apply compressive stress only to the fragile portion of the casting which may crack on its surface during continuous casting . Thus, the generation of surface cracks can be suppressed or prevented by applying compressive stress to the cast steel at the front end of the reference drive roll on the path where the cast steel is pulled out, and no compressive stress is applied to the cast steel at the rear end of the reference drive roll. From this, energy consumption of the continuous casting process can be reduced, and the cast steel can be drawn smoothly.

The operation unit 162 is connected to the storage unit 161 and is capable of calculating the rotation speed of each of the plurality of drive rolls 140 using the rotation speed information of the reference drive roll received from the storage unit 161. Specifically, the calculating unit 162 can calculate the rotational speeds of the following drive rolls on the basis of the rotational speeds of the preceding drive rolls so that each of the plurality of drive rolls 140 is controlled at different rotational speeds. At this time, the calculating unit 162 can calculate the rotational speed of the following drive roll so that the rotational speed of the preceding drive roll increases within the range of 0.2% to 2% with respect to the rotational speed of the following drive roll. Therefore, the rotational speed of the preceding driving roll, which is relatively short in distance from the mold 130, of the two driving rolls disposed adjacent to each other in the direction in which the main strip is pulled out, The rotational speed of each drive roll can be calculated to be 1.002 times to 1.02 times of the rotational speed of each drive roll.

The calculating unit 162 can calculate the rotational speed of each of the plurality of drive rolls 140 so that the rotational speed ratio of the rotational speed of the preceding drive roll and the rotational speed of the following drive roll is constant with respect to the direction in which the main track is pulled out. That is, the rotational speed ratio of the driving roll at a position spaced apart from the driving roll at one position of the plurality of driving rolls in the direction toward the mold 130 and the rotational speed ratio of the driving roll at a position spaced apart from the one position among the plurality of driving rolls The rotational speed ratios of the drive rolls at the other positions and the rotational speed ratios of the drive rolls at positions spaced apart from the drive rolls in the direction toward the mold 130 may be fixed to each other. Thus, the compressive stress applied to the cast steel can be constant with respect to the entire region of the cast steel in the direction in which the cast steel is pulled out, so that quality control of the cast steel face can be facilitated.

The calculating section 162 calculates the rotational speed of each of the plurality of drive rolls 140 so that the rotational speed ratio of the rotational speed of the preceding drive roll and the rotational speed of the following drive roll increases with respect to the direction in which the main track is pulled out And the rotation speed of each of the plurality of drive rolls 140 may be calculated so as to decrease with respect to the direction in which the main shaft is pulled out. For example, the rotation of the driving roll at a position farthest away from the mold 130 among the driving rolls at three positions spaced apart from each other in the direction in which the main strip is pulled out and the driving roll at the middle position among the driving rolls at three positions The ratio of the rotational speed of the driving roll at the middle position to the rotational speed of the driving roll at the position closest to the mold 130 among the driving rolls at three positions among the three positions of the driving rolls at three positions, Thus, the magnitude of the compressive stress applied to the billet can be controlled so as to be gradually increased or decreased according to the direction in which the billet is pulled out, so that the quality of the billet surface can be controlled in various ways.

Of course, in addition to the above-described method, the rotational speed ratio of the preceding drive roll and the following drive roll can be determined in arbitrary sections in various manners. The rotational speed ratio between the leading drive roll and the trailing drive roll in a predetermined section vulnerable to the occurrence of surface cracks and the rotational speed ratio of the leading drive roll and the trailing drive roll in the remaining section among arbitrary sections, The rotational speeds of the respective drive rolls can be calculated so that the ratios are different from each other. From this, it is possible to apply a desired amount of compressive stress locally or selectively to the cast steel, thereby improving the energy efficiency in the process of controlling the rotational speed of each of the drive rolls for controlling the quality of the cast steel surface.

In the embodiment of the present invention, the main yarn can be drawn through the banding section and the unbending section successively. The cast steel passing through the unbending section is spaced apart in the thickness direction of the cast steel and has the same drawing speed at one face and the other face of the cast steel opposite to each other. The cast steel passing through the casting section has a draw- different. The pulling speed of the other surface of the cast steel facing the outside which is opposite to the pulling speed of the one surface of the cast steel facing the inside where the center of curvature of the cast steel is located can be faster, especially about the cast steel passing through the banding section.

Corresponding to this, in the unbending section of the main spindle, the calculating section 162 can calculate the rotational speed so that the rotational speeds of the driving rolls located on the inner side and the driving rolls positioned on the outer side among the plurality of driving rolls 140 are equal to each other . The calculating unit 162 can calculate the rotational speed so that the rotational speed of the driving roll located outside the rotational speed of the driving roll located inside of the plurality of driving rolls 140 is large in the banding period of the strip. This means that when the calculating unit 162 calculates the rotational speed of each driving roll, the inner and outer driving rolls are divided to correspond to the above-mentioned characteristic of each section, and the rotational speed thereof is calculated. The main body can be pulled smoothly in both the unbending section and the bending section of the main body.

The control unit 163 is connected to the arithmetic unit 162 and is connected to each of the plurality of drive rolls 140 so as to follow the rotational speed value of each drive roll received from the arithmetic unit 162 The output of the roll motor 150 can be controlled. So that the rotational speed of each drive roll can be controlled to a desired rotational speed so that compressive stress can be applied to the product between each drive roll spaced apart in the product take-off direction. Various known techniques implemented to control various servomotors can be applied to the control unit 163 for controlling the output or the torque of the driving roll motor, so that the description thereof will be omitted.

2 and 3 are partial schematic views showing a continuous casting apparatus to explain a continuous casting method according to an embodiment of the present invention. 2 is a partial schematic view showing a part of the driving rolls provided in the unbending zone of the main roll of the driving rolls provided in the continuous casting apparatus according to the embodiment of the present invention, Is a partial schematic view showing a part of the driving rolls provided in the banding zone of the casting roll of the continuous casting apparatus. 4 is a table for explaining the results obtained by varying the rate of increase of the rotational speed of the driving roll in the continuous casting process using the continuous casting method according to the embodiment of the present invention, Sectional graph illustrating the change of the cross-sectional shrinkage rate of the steel material to be treated in the continuous casting process according to the temperature change.

Hereinafter, a continuous casting method applied to a continuous casting apparatus according to an embodiment of the present invention will be described with reference to Figs. 1 to 5. Fig.

The continuous casting method according to the embodiment of the present invention includes a continuous casting apparatus having a mold 130 and a controller 160 capable of speed control of a plurality of drive rolls 140 and a plurality of drive rolls 140 A process of pulling out the slab from the mold 130, and a process of controlling the rotational speed of each of the driving rolls 140 to apply a compressive stress in a direction in which the slab is pulled out to the slab.

First, a continuous casting apparatus according to an embodiment of the present invention is provided. The continuous casting apparatus includes a ladle 110 in which refined molten steel is received, a tundish 120 for receiving and temporarily storing molten steel from the ladle 110, a mold 120 for supplying molten steel from the tundish 120 and solidifying the molten steel into a predetermined shape, A plurality of driving rolls 130 arranged to be spaced apart from each other in a direction of drawing the main strips at a plurality of positions spaced apart from each other in the thickness direction of the main strip, A drive roll motor 150 connected to each of the plurality of drive rolls 140 to control the rotation speed of each of the plurality of drive rolls 140, And a controller 160 for controlling the rotational speed and applying a compressive stress in a direction in which the main body is pulled out to the slab.

Next, the molten steel is supplied to the mold 130 and the casting is continuously drawn from the mold 130. [ The casting strips drawn from the mold 130 are drawn between a plurality of drive rolls 140 disposed at a plurality of positions in the direction in which the main strips are drawn out and are continuously pressed down by the rotation of the drive rolls 140, have. At this time, as shown in FIG. 1, the cast steel which is pulled in between the plurality of drive rolls 140 spaced apart in the thickness direction of the cast steel and continuously pulled out is bent at a predetermined curvature through the curvature portion, for example, Drawn, and then horizontally straightened and drawn through the horizontal portion of the strand, e.g., the unbending portion.

On the other hand, in the molten steel cast into the cast steel in the combustion casting apparatus, the additive constituent elements such as nickel (Ni), copper (Cu) and boron (B) 0.04%. &Lt; / RTI &gt; Therefore, the content of each constituent element of the molten steel may be different for each desired steel species. This is caused by the addition or addition of various alloying elements to the steel for the production of high-grade steel satisfying the light weight of the steel and the superficialization of the steel, and the steel having different contents of the constituent elements added to the steel has a cross- RA) values may differ from each other.

Here, the cross-sectional shrinkage ratio of steel is information obtainable by a method of preparing a tensile specimen according to the steel type and performing a tensile test at each temperature. The higher the cross-sectional shrinkage value, the more ductile properties are obtained. The higher the export rate, the more brittle it is. That is, the larger the value of the cross-sectional shrinkage ratio is, the stronger the tensile stress is, and the smaller the cross-sectional shrinkage value, the more easily it is broken by the tensile stress. When the degree of crack sensitivity of the steel is judged by the value of the sectional shrinkage percentage, it is judged that the higher the sectional shrinkage value, the lower the crack sensitivity, and the lower the sectional shrinkage value, the higher the crack sensitivity.

A plurality of steels having different contents of predetermined component elements were prepared, and a cross-sectional shrinkage ratio (RA) value according to the temperature of the steel was obtained by a tensile test. The results are shown in FIG. Here, A steel type is a steel type having a relatively smaller amount of alloy added than B type steel, B type steel is a steel type having a relatively small amount of alloy addition than C type steel, and C type steel is a steel type having a relatively smaller amount of alloy added than D type steel.

Referring to FIG. 5, it can be seen that the value of the cross-sectional shrinkage ratio decreases in the entire temperature range as the kind and amount of the added element added to the molten steel increases. It is also seen that the temperature range of the steel corresponding to the cross-sectional shrinkage region, for example, a region where the cross-sectional shrinkage value is less than 50%, which is vulnerable to cracking, increases as the kind and amount of the additive element added to molten steel increase. Therefore, in the continuous casting process, the process should be controlled so as to avoid a temperature region having a low sectional shrinkage and to set an appropriate temperature condition corresponding to each steel type in order to suppress cracks on the surface of the cast steel during continuous casting. For example, in order to continuously cast C steel or D steel, the temperature condition in the continuous casting process should be set to avoid around 800 ° C. Therefore, it is difficult to control the temperature in the process of continuous steel casting for various steel types. Even if the temperature is controlled, there is a limit in suppressing cracking of cast steel.

However, in the embodiment of the present invention, since the occurrence of cracks can be suppressed or prevented by applying compressive stress over a predetermined region or an entire region of the cast steel, the temperature condition of a C steel or a D steel, for example, It is possible to effectively suppress or prevent the occurrence of cracks on the surface of the cast steel even if casting of C steel or D steel is controlled. That is, in the embodiment of the present invention, since the generation of cracks on the surface of the cast steel is suppressed or prevented by applying the compressive stress to the cast steel, the cast steel can be cast in a wider temperature range during casting in the continuous casting process of various types of steel. The temperature condition at the time of casting can be controlled more easily than before.

Next, the rotating speed of each of the driving rolls 140 is controlled to apply compressive stress in a direction in which the main strip is pulled out to the strip. The process of applying the compressive stress to the cast steel is performed by moving each of the plurality of drive rolls 140 in such a manner that the rotational speed of the preceding drive roll preceding the casting direction is greater than the rotational speed of the following drive roll, And controlling them at different rotational speeds. At this time, each of the plurality of drive rolls can be controlled at different rotational speeds so that the degree of change in rotational speed between the preceding drive roll and the following drive roll is equal to each other in the direction in which the main lead is pulled out, It is possible to control each of the plurality of drive rolls at different rotational speeds so that the degree of change in the rotational speed between the rolls increases or decreases in the direction in which the main body is pulled out.

The process of controlling each of the plurality of drive rolls at different rotational speeds is exemplified so that the degree of change in the rotational speed between the leading drive roll and the trailing drive roll is the same in the direction in which the lead pieces are pulled out. Is as follows.

The process of controlling each of the plurality of drive rolls at different rotation speeds in the unbending zone of the main spindle,

When V N + 1 = V N + V N * a, N = 1, 2, 3, ...,

In the unbending period of the main spindle, each of the plurality of drive rolls is controlled at different rotational speeds by using [Equation 1].

Here, the coefficient (a) is a proportional coefficient expressed by numerically expressing the degree of change in the rotational speed between the preceding drive roll and the following drive roll, that is, the rate of increase in speed, and can be obtained by repeating the continuous casting process. In the present embodiment, the coefficient (a) satisfying the following formula is exemplified.

0.002? A? 0.02

The rotational speed V means an intermediate value between the rotational speed of the driving roll located inside of the plurality of driving rolls 140 spaced apart in the thickness direction of the casting and the rotational speed of the driving roll located outside, And corresponds to the drawing velocity of the strip at the center position in the thickness direction of the strip. The rotational speed VI of the driving roll and the rotational speed VO of the driving roll located on the inner side of the plurality of driving rolls with respect to the rotational speed V in the unbending section of the main shaft satisfy the following equation do.

VI = V = VO

The subscripts N are subscripts for indicating the position of each of a plurality of drive rolls spaced apart from each other in the direction in which the main strips are pulled out. The larger the value, the closer the main roll is to the preceding drive roll, Means the position of the driving roll, and when the subscript (N) is 1, it means the position of the reference driving roll.

Therefore, the rotational speed (VI N) includes a plurality of outer side the means the rotational speed of the main shift plurality of inner drive that are spaced apart from each other in a direction in which the drawing rolls, respectively, and the rotational speed (VO N) is spaced from each other in the direction in which the pull-out state shift Means the rotation speed of each drive roll. In this case, as the value of the subscript (N) increases, the rotational speed of the inner and outer drive rolls is relatively close to the mold, or when the value of the subscript (N) is 1, the inner and outer Means the rotational speed of the reference drive roll.

Hereinafter, with reference to FIG. 2, a process of controlling each of a plurality of drive rolls at different rotational speeds in an unbending zone of the main spindle will be described. Here, for convenience of explanation, the inner and outer reference drive rolls among a plurality of drive rolls disposed in the unbending zone of the main span will be described.

The rotational speed VI 2 of the inner second drive roll RI 2 located away from the inner reference drive roll RI 1 in the direction toward the mold opposite to the direction in which the main shaft is pulled out is detected by the inner reference drive roll RI 1 by 0.002 to 0.02 times as much as the rotational speed VI 1 of the first clutch C1. The rotational speed VI 3 of the inner third driving roll RI 3 located apart from the inner second driving roll RI 2 in the direction toward the mold is smaller than the rotational speed VI of the inner second driving roll RI 2 , (VI 2 ).

The rotational speed VO 2 of the outer second driving roll RO 2 located apart from the outer reference driving roll RO 1 in the direction toward the mold is determined by the rotational speed VO of the outer reference driving roll RO 1 1 ) by 0.002 to 0.02 times. The rotational speed VO 3 of the outer third driving roll RO 3 which is located apart from the outer second driving roll RO 2 in the direction toward the mold is determined by the rotational speed VO 2 of the outer second driving roll RO 2 , Is controlled to be 0.002 to 0.02 times the rotational speed of VO 2 .

The above relationship can be expressed as follows.

(VI 3 = VO 3 = V 3 )> (VI 2 = VO 2 = V 2 )> (VI 1 = VO 1 = V 1 )

Therefore, as shown in the figure, between the drive rolls spaced apart from each other in the direction in which the main strip is pulled out, compressive stress in the stripping direction of the strip is applied to the strip, whereby the tensile stress acting on the strip surface The surface cracking due to tensile stress can be suppressed or prevented.

The process of controlling each of the plurality of drive rolls at different rotation speeds in the bending section of the casting,

V N + 1 = (k I * V N ) + (k I * V N ) * a, N = 1, 2, 3, ...

[Expression 3] when the VO N + 1 = (k O * V N) + (k O * V N) * a, N = 1, 2, 3, ...,

In the banding zone of the casting, each of the driving rolls located inside the plurality of driving rolls is controlled at different rotational speeds by using [Equation 2], and by using [Equation 3] The rolls are controlled at different rotational speeds.

Here, the coefficient (a) is a proportional coefficient expressed by numerically expressing the degree of change in the rotational speed between the preceding drive roll and the following drive roll, that is, the rate of increase in speed, and satisfies the following equation.

0.002? A? 0.02

The rotational speed V means an intermediate value between the rotational speed of the inner drive roll and the rotational speed of the outer drive roll, and corresponds to the withdrawal speed of the casting at the center position in the thickness direction of the cast steel. The relation between the rotational speed VI of the inner drive roll and the rotational speed VO of the outer drive roll among the plurality of drive rolls with respect to the rotational speed V in the banding zone of the casting can be expressed as follows.

(VI = K I * V) <V <(VO = K O * V), 0 <K I <1 <K O

Here, the coefficient K I is calculated by taking into consideration the drawing speed at one surface of the cast steel facing the inside and the difference in the cast steel drawing speed at the center position in the thickness direction of the cast steel with respect to the cast steel being bent at a predetermined curvature, . The coefficient K o is calculated by taking into account the difference between the drawing speed at the other surface of the cast steel toward the outside and the drawing speed at the center position in the thickness direction of the cast steel with respect to the cast steel being bent at a predetermined curvature, . For example, the coefficient K I and the coefficient K O can be derived as a numerical value by measurement or can be expressed by the following equation.

K I = 1 - ((thickness of cast steel) / 2) * (1 / (radius of curvature))

K O = 1 + ((thickness of cast steel) / 2) * (1 / (radius of curvature))

The subscripts N are subscripts for indicating the position of each of a plurality of drive rolls spaced apart from each other in the direction in which the main strips are pulled out. The larger the value, the closer the main roll is to the preceding drive roll, Means the position of the drive roll.

Therefore, the rotational speed (VI N) includes a plurality of outer side the means the rotational speed of the main shift plurality of inner drive that are spaced apart from each other in a direction in which the drawing rolls, respectively, and the rotational speed (VO N) is spaced from each other in the direction in which the pull-out state shift Means the rotation speed of each drive roll.

Hereinafter, with reference to FIG. 3, a process of controlling each of a plurality of drive rolls at different rotation speeds in a bending section of the cast steel will be described. For convenience of explanation, a plurality of drive rolls The inner and outer fourth drive rolls will be used as a reference.

The rotational speed of the inner fifth drive roll (RI 5) spaced apart in the direction toward the mold from inside the fourth driving roll (RI 4) (VI 5) is a rotational speed (VI 4) inside the fourth driving roll (RI 4) 0.0 &gt; 0.02 &lt; / RTI &gt; The rotational speed VI 6 of the inner sixth driving roll RI 6 positioned away from the inner fifth driving roll RI 5 in the direction toward the mold is determined by the rotational speed VI of the inner fifth driving roll RI 5 , Is controlled to 0.002 to 0.02 times the rotation speed of the blade (VI 5 ).

The rotational speed VO 5 of the outer fifth driving roll RO 5 which is located apart from the outer fourth driving roll RO 4 in the direction toward the mold is set to a rotational speed VO 4 of the outer fourth driving roll RO 4 , (VO 4 ) by 0.002 to 0.02 times. The rotational speed VO 6 of the outer sixth driving roll RO 6 positioned away from the outer fifth driving roll RO 5 in the direction toward the mold is set to a rotational speed VO of the outer fifth driving roll RO 5 , Is controlled to a rotation speed of 0.002 to 0.02 times the VO 5 .

The above relationship can be expressed as follows.

VI 4 <V 4 <VO 4 , VI 5 <V 5 <VO 5 , VI 6 <V 6 <VO 6

VI 6 > VI 5 > VI 4 , VO 6 > VO 5 > VO 4

Therefore, as shown in the figure, between the drive rolls spaced apart from each other in the direction in which the main strip is pulled out, compressive stress in the stripping direction of the strip is applied to the strip, whereby the tensile stress acting on the strip surface The surface cracking due to tensile stress can be suppressed or prevented.

By the above-described process, a cast slab having a desired surface quality is cast, and the cast slab is cut to a desired length and transferred to a subsequent process.

In order to obtain the rate of change in the rotational speed between the preceding drive roll and the following drive roll, that is, the rate of increase in speed, the continuous casting process was repeatedly performed while varying the magnitude of the coefficient a. do. For convenience of explanation, experimental results derived from a part of the unbending section are mainly described. Experiments have been performed in the entire area including the unbending section and the banding section of the main body. Therefore, The features are equally applicable to the entire area including the unbending section and the banding section of the main body.

As shown in FIG. 4, the experiment for obtaining the coefficient (a) by quantifying the degree of change in the rotational speed between the preceding drive roll and the following drive roll, that is, the rate of increase in speed, Were determined to be 0.0005, 0.002, 0.01, 0.02 and 0.05, respectively, and the degree of occurrence of cracks on the surface of the cast steel was observed in each case.

First, in the first experiment (Case 1), casting was repeatedly performed at a rate of increase of 0.05%. As a result, it was confirmed that a crack occurred in the cast steel. This means that when the rate of increase in speed is set to 0.05%, the compressive stress is not applied as much as desired. On the other hand, considering that the strain level of the cast steel during bending and unbending of cast steel in a general continuous casting facility has a strain value of, for example, 0.2% to 0.3%, the above-mentioned result that a crack occurs in the cast steel can be sufficiently explained.

Next, as a result of repeating casting at the rate of 0.2%, 1% and 2% in the second experiment (Case 2), the third experiment (Case 3) and the fourth experiment (Case 4) . This means that in the case of the rate of increase of the above-mentioned numerical value, the compressive stress is applied to the cast as much as desired.

Next, in the fifth experiment (Case 5), casting was repeatedly performed at a rate of 5%, but the test could not be continued due to overloading in some drive rolls. However, when the above numerical value is applied, it can be predicted that the difference in speed may be excessively generated in each position of the cast steel during the casting of the cast steel. If the rate of increase is set to 5% or more, The quality may be deteriorated.

Therefore, in this embodiment, the value of the coefficient (a) is exemplified in the range of 0.002 to 0.02 as a proportional coefficient expressed by numerically expressing the degree of change in the rotational speed between the preceding drive roll and the following drive roll.

In the continuous casting process in which the continuous casting apparatus and the continuous casting method according to the embodiment of the present invention are applied, the generation of surface cracks due to tensile stress applied to the cast steel is suppressed or prevented by applying compressive stress to the cast steel during casting of the cast steel And a cast steel having excellent surface quality can be obtained.

Although the above embodiment of the present invention has exemplified the continuous casting process of steel, it can be applied to various equipment for continuously casting various melts. It should be noted, however, that the above-described embodiments of the present invention are for the purpose of explanation of the present invention and not for the purpose of limitation. It is to be understood that various modifications may be made by those skilled in the art without departing from the scope of the present invention.

130: mold 140: drive roll
150: driving roll motor 160: controller

Claims (14)

Providing a continuous casting apparatus having a mold, a plurality of drive rolls, and a controller capable of controlling the speed of each of the plurality of drive rolls;
Withdrawing a casting from the casting mold; And
And controlling the rotational speed of each of the drive rolls to apply a compressive stress to the cast steel in a direction in which the cast steel is pulled out.
The method according to claim 1,
In the process of applying the compressive stress to the cast steel,
And controlling each of the plurality of drive rolls at different rotational speeds so that the rotational speed of the preceding drive roll preceding the main track relative to the direction in which the main track is pulled out is greater than the rotational speed of the trailing drive roll following the main track Lt; / RTI &gt;
The method of claim 2,
Wherein the plurality of drive rolls are controlled at different rotational speeds so that the degree of change in rotational speed between the preceding drive roll and the following drive roll is equal to each other in a direction in which the main lead is pulled out.
The method of claim 2,
Wherein each of the plurality of drive rolls is controlled at a different rotational speed so that the degree of change in rotational speed between the preceding drive roll and the following drive roll increases or decreases in a direction in which the main lead is extracted.
The method according to any one of claims 2 to 4,
When the intermediate value between the rotational speed of the driving roll located on the inner side and the rotational speed of the driving roll located on the outer side among the plurality of driving rolls is V,
The rotational speed VI of the driving roll located inside and the rotational speed VO of the driving roll located outside the inside of the plurality of driving rolls may be set to a predetermined value in the unbending section
VI = V = VO.
The method of claim 5,
Wherein the controlling each of the plurality of driving rolls at different speeds comprises:
When V N + 1 = V N + V N * a, N = 1, 2, 3, ...,
In the unbending period of the main spindle, the plurality of driving rolls are controlled at different rotational speeds by using [Equation 1], where a is
0.002? A? 0.02,
Wherein N is a position of each of a plurality of drive rolls spaced apart from each other in a direction in which the main strip is pulled out, and the larger the value, the closer to the casting mold.
The method according to any one of claims 2 to 4,
When the intermediate value between the rotational speed of the driving roll located on the inner side and the rotational speed of the driving roll located on the outer side among the plurality of driving rolls is V,
The rotational speed VI of the driving roll located inside and the rotational speed VO of the driving roll located outside the plurality of driving rolls are set to be the same as each other in the bending section
VI < V < VO.
The method of claim 7,
Wherein the controlling each of the plurality of driving rolls at different speeds comprises:
N is the position of each of the plurality of drive rolls spaced from each other in the direction in which the main strip is pulled out, and the larger the value is, the position of the drive roll,
V N + 1 = (k I * V N ) + (k I * V N ) * a, N = 1, 2, 3, ...
[Expression 3] when the VO N + 1 = (k O * V N) + (k O * V N) * a, N = 1, 2, 3, ...,
In the bending section of the cast steel, each of the drive rolls located at the inner side among the plurality of drive rolls is controlled at different rotational speeds by using [Equation 2], and the outermost one of the plurality of drive rolls Control each of the positioned driving rolls at different rotational speeds, wherein a, k I, and k O are
0.002? A? 0.02, and k I <1 <k O ,
Wherein N is a position of each of a plurality of drive rolls spaced apart from each other in a direction in which the main strip is pulled out, and the larger the value, the closer to the casting mold.
A continuous casting apparatus for casting molten steel into a cast steel,
A mold for forming a passage through which the molten steel passes;
A plurality of drive rolls spaced apart from each other in a pull-out direction of the cast steel so as to be able to pull out the cast steel to a lower side of the cast steel;
A driving roll motor connected to each of the plurality of driving rolls to control respective rotational speeds; And
And a controller for controlling a rotational speed of each of the plurality of drive rolls so that a compressive stress is applied to the cast in a direction in which the main body is pulled out.
The method of claim 9,
The controller comprising:
A storage unit for storing information on the steel strip casting speed of the molten steel and the rotational speed information of the reference driving roll corresponding to the steel strip drawing speed information;
Wherein the rotating speed of the preceding driving roll, which is relatively close to the mold, of the plurality of driving rolls is greater than the rotating speed of the trailing driving roll, which is a position relatively far from the mold, An operation unit for calculating a rotation speed of each of the plurality of drive rolls; And
And a control unit for controlling an output of a driving roll motor connected to each of the plurality of driving rolls so as to follow a rotational speed of each of the plurality of driving rolls calculated by the calculating unit to control the rotational speed of each of the plurality of driving rolls Continuous casting equipment.
The method of claim 10,
The arithmetic unit calculates the rotational speed of the following driving roll based on the rotational speed of the preceding driving roll so that each of the plurality of driving rolls is controlled at a different rotational speed,
And calculates the rotational speed of the following drive roll so that the rotational speed of the preceding drive roll increases within a range of 0.2% to 2% with respect to the rotational speed of the following drive roll.
The method of claim 11,
And the arithmetic section calculates the rotational speed of each of the plurality of drive rolls such that a rotational speed ratio of the rotational speed of the preceding drive roll and the rotational speed of the following drive roll is constant with respect to a direction in which the main track is pulled out.
The method of claim 11,
Wherein the arithmetic unit calculates the rotational speed of each of the plurality of drive rolls so that the rotational speed ratio of the rotational speed of the preceding drive roll and the rotational speed of the following drive roll increases with respect to the direction in which the main lead is pulled out, And the rotation speed of each of the plurality of drive rolls is decreased.
The method according to any one of claims 11 to 13,
Wherein the calculation unit calculates the rotation speed so that the rotation speeds of the drive rolls positioned on the inner side and the drive rolls positioned on the outer side of the plurality of drive rolls are equal to each other in the unbending interval of the main spindle, Wherein the rotational speed is calculated so that the rotational speed of the driving roll located outside the rotational speed of the driving roll located inside of the two driving rolls is larger.
KR1020140141769A 2014-10-20 2014-10-20 Method and apparatus for continuous casting KR20160046381A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110434305A (en) * 2019-08-30 2019-11-12 中国重型机械研究院股份公司 A kind of system and method controlling the driven loads dynamic equilibrium of sheet billet continuous casting host area
KR102098023B1 (en) * 2018-10-24 2020-04-07 주식회사 포스코 Apparatus for setting temperature of continuous casting device

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Publication number Priority date Publication date Assignee Title
KR101439620B1 (en) 2012-09-03 2014-09-11 주식회사 포스코 Apparatus and method of controlling driving roll of casting equipment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101439620B1 (en) 2012-09-03 2014-09-11 주식회사 포스코 Apparatus and method of controlling driving roll of casting equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102098023B1 (en) * 2018-10-24 2020-04-07 주식회사 포스코 Apparatus for setting temperature of continuous casting device
CN110434305A (en) * 2019-08-30 2019-11-12 中国重型机械研究院股份公司 A kind of system and method controlling the driven loads dynamic equilibrium of sheet billet continuous casting host area

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