KR20240048849A - State measuring device, casting apparatus and casting method - Google Patents

Abstract

The present invention includes a main body disposed to face the path through which the cast slab is drawn, a measuring unit installed in the main body so that it can be input into the path and measuring the temperature of the cast slab by contacting the cast slab, and measuring the casting state of the cast slab. A state measuring device, a casting device, and a casting method that can accurately measure the casting state of a cast steel are presented as a state measuring device, a casting device including the same, and a casting method applied thereto.

Description

STATE MEASURING DEVICE, CASTING APPARATUS AND CASTING METHOD}

The present invention relates to a state measuring device, a casting device, and a casting method, and more specifically, to a state measuring device, a casting device, and a casting method that can accurately measure the casting state of a cast steel.

The molten steel that has been refined in the converter is charged into a ladle and transported to the casting facility. The molten steel in the ladle is supplied to the tundish of the casting facility, and the molten steel in the tundish is injected into the mold, cooled first, and cast into cast steel. At this time, a solidified layer is formed on the surface of the cast steel, and an unsolidified layer is formed inside the cast steel. Additionally, the cast steel is drawn from the mold by a plurality of segments and subjected to secondary cooling. At this time, while the cast steel is being drawn, solidification of the unsolidified layer progresses inside the cast steel.

Meanwhile, during casting, it is necessary to measure the surface temperature of the cast steel undergoing secondary cooling. In other words, in order to control the cast steel temperature related to the surface cracks of the cast steel, determine the optimal light pressure position of the cast steel to reduce center segregation of the cast steel, and establish the boundary conditions of the heat transfer model for analyzing the internal temperature and solidification state of the cast steel. , it is important to accurately measure the surface temperature of the cast steel.

Conventionally, the surface temperature of cast steel was measured from a distance using a thermometer, radiation pyrometer, etc. However, the conventional method has a problem in that it is difficult to accurately measure the temperature due to the influence of oxidized scale generated on the surface of the cast steel and dust scattered around the cast steel.

Additionally, during casting, it is necessary to measure the thickness of the solidified layer of the cast steel undergoing secondary cooling. Conventionally, a gun is used to insert an aluminum-coated steel pin into a cast piece undergoing secondary cooling, and after secondary cooling is completed, the cast steel pin is cut at the position where the iron pin is inserted, and the aluminum is removed from the cut surface of the cast steel. The thickness of the coagulated layer was measured by confirming the location of the membrane.

In order to accurately measure the thickness of the solidified layer using this conventional method, the aluminum-coated iron pin must sufficiently enter the unsolidified layer of the cast steel and melt the aluminum-coated iron pin within the unsolidified layer.

However, when cast steel is cast from a high-strength steel type, the solid rate of the cast steel is high, or the cast steel is thick, there is a problem in that it is difficult to insert the aluminum-coated iron pin into the unsolidified layer inside the cast steel. Accordingly, even if an aluminum-coated steel pin is inserted into a cast steel that is undergoing secondary cooling, the aluminum-coated steel pin cannot enter the unsolidified layer, and an aluminum film cannot be formed inside the cast steel. As a result, the thickness of the cast steel is measured. Situations often occurred where this could not be done.

The technology behind the present invention is published in the following patent documents.

KR 10-1818154 B1 KR 20-0116766 Y1

The present invention provides a condition measuring device, a casting device, and a casting method that can accurately measure the casting condition of a cast piece.

A state measuring device according to an embodiment of the present invention is a state measuring device for measuring the casting state of a cast slab, and includes a main body disposed to face the path through which the cast slab is drawn; It includes a measuring part installed in the main body so that it can be introduced into the path, and capable of measuring the temperature of the cast steel by contacting the cast steel.

It may include a core portion supported by the measuring unit and seated on the cast steel to generate a crack inside the cast steel.

It may include a fixing part formed on the bottom surface of the core so that it can be fixed to the surface of the cast steel using the weight of the core.

The main body part is disposed on the upper side of the path, the length is adjustable, and the measuring part has a first region that is wound and supported by the main body part, and a second region that can be deployed from the main body part and the core part is supported at an end. Can include areas.

The second area is arranged to pass between two selected drawing machines among the drawing machines arranged along the path to draw the cast steel, and the height may be adjusted by winding and unwinding the first area.

The main body portion includes a body; a storage roll rotatably disposed on the body, the first region of the measuring portion being wound and supported on an outer surface; It extends from the body to cross the upper side of the path, has an adjustable length, and may include a support arm for supporting the second region of the measuring unit.

The main body portion is connected to the storage roll, and includes a motor for rotating the storage roll so that the measurement portion can be rolled up and stored or unwound and introduced. It may include a switching roll rotatably disposed at an end of the support arm and for changing the direction of deployment of the measuring unit along the outer surface.

The measuring unit includes a thermocouple wire; a contact member formed at an end of the thermocouple wire to be positioned on the bottom surface of the core portion; It may include a data collector connected to the thermocouple wire and measuring the temperature of the cast steel.

A plurality of the core portions are provided according to the thickness of the cast slab, and can be replaced according to the thickness of the cast slab.

The measuring portions are provided in the same number as the number of core portions, and can be replaced together with the core portion when the core portion is replaced.

The core portion has a bottom surface and an upper surface that face each other, and a side surface connecting the bottom surface and the upper surface, and a portion of the upper surface may be formed to be inclined.

The inclined surface formed on a portion of the upper surface of the core portion may be formed to be inclined so as to approach the bottom surface of the core portion as the distance from the end of the measuring portion increases.

The core portion may have a through hole formed to penetrate the bottom surface and the top surface.

The fixing part may protrude so that the width becomes narrower as the distance from the bottom surface of the core part increases.

The fixing part may be provided in plural numbers and may be arranged along the perimeter of the bottom surface of the core part.

A casting device according to an embodiment of the present invention includes a mold; A plurality of drawing machines arranged to form a path through which cast steel is drawn from the lower side of the mold; It includes a state measuring device disposed between two drawing machines selected from among the plurality of drawing machines and capable of measuring the temperature of the cast steel by contacting the cast steel.

The condition measuring device includes a thermocouple wire to be seated on the surface of the cast steel, and a measuring unit including a contact member formed at an end of the thermocouple wire to measure the temperature of the cast steel by contacting the cast steel; It may include a core portion connected to the thermocouple wire and seated on the cast steel to generate a crack inside the cast steel.

A through hole is formed in the core part, the condition measuring device includes a main body part, and the measuring part may be installed in the main body part so that it can be deployed from the main body part.

A casting method according to an embodiment of the present invention includes the process of drawing a cast slab from a mold; A process of advancing solidification from the surface of the cast steel to the inside; A process of contacting a condition measuring device to the surface of the cast steel; It includes; measuring the temperature of the surface of the cast steel with the condition measuring device.

The process of contacting the state measuring device includes: seating the contact member and core provided at the end of the state measuring device on the cast plate; It may include a process of moving the contact member and the core portion together with the cast steel in the casting direction.

The process of seating the contact member and the core portion on the cast plate may include a process of fixing the bottom surface of the core portion on the cast plate.

The process of moving the contact member and the core along with the cast slab in the casting direction includes: entering the contact member and the core between the roller for drawing the cast slab and the cast slab; A process of pressing down the contact member and the core that enters between the roller and the cast slab; and the process of measuring the temperature of the surface of the cast slab with the condition measuring device is a process of measuring the temperature of the surface of the cast slab from the pressed contact member. May include ;.

The process of reducing the contact member and the core portion may include positioning the contact member and the core portion below the outermost surface of the cast steel.

The process of entering the contact member and the core between the roller for drawing the cast slab and the cast slab may include a process of contacting the roller from an inclined surface formed on the core.

A process of generating a cast crack inside the cast slab while pressing down the contact member and the core that enter between the roller and the cast slab; And it may further include a process of measuring the thickness of the solidified layer in the cast steel using the generated crack.

The process of measuring the thickness of the solidified layer includes discharging the cast slab from the path through which the cast slab is drawn; A process of cutting the discharged cast steel; It may include a process of measuring the depth of the crack on the cut surface of the cut cast steel.

According to an embodiment of the present invention, a measuring unit for measuring the temperature of the cast steel can be brought into contact with the cast steel being cast. Accordingly, the surface temperature of the cast steel can be measured consistently and accurately without being affected by various contaminants such as scale generated on the surface of the cast steel and dust scattered around the cast steel.

According to an embodiment of the present invention, a crack can be created inside the cast slab by seating the core portion on the surface of the cast slab and pressing the core portion. Accordingly, the thickness of the solidified layer of the cast steel can be accurately measured. In other words, regardless of the conditions of the cast steel, such as steel type, solidity rate, and thickness, the simple structure and operation of seating the core on the surface of the cast steel creates a crack inside the cast steel, and the thickness of the solidified layer of the cast steel is consistently and accurately determined. It can be measured.

In addition, according to an embodiment of the present invention, the temperature can be measured by contacting the cast steel and a crack can be created inside the cast steel. Therefore, both the surface temperature of the cast steel and the thickness of the solidified layer of the cast steel can be accurately measured using a simple structure.

1 is a schematic diagram of a casting device according to an embodiment of the present invention.
Figure 2 is a schematic diagram showing how the condition measuring device according to an embodiment of the present invention operates to bring the measuring part into contact with the surface of the cast steel.
Figure 3 is a schematic diagram of a state measuring device according to an embodiment of the present invention.
Figure 4 is a schematic diagram of a measuring portion and a core portion according to an embodiment of the present invention.
Figures 5 to 7 are schematic diagrams for explaining a method of measuring the surface temperature of a cast slab using a measuring unit according to an embodiment of the present invention and a method of creating a crack inside the cast slab.
Figure 8 is a schematic diagram illustrating a method of measuring the thickness of the solidification layer by measuring the depth of the crack on the cut surface of the cast steel where the crack was created by the deep portion according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. However, the present invention is not limited to the embodiments disclosed below, and will be implemented in various different forms. Only the embodiments of the present invention are provided to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. The drawings may be exaggerated to explain embodiments of the present invention, and like symbols in the drawings refer to like elements.

The present invention relates to a state measuring device, a casting device, and a casting method. Hereinafter, a case where the state measuring device, a casting device, and a casting method are applied to a process of casting a cast steel used as a semi-finished product in steelmaking operations will be described as an example of the present invention. is explained in detail.

Of course, the state measuring device, casting device, and casting method according to embodiments of the present invention can be applied to various facilities and processes for casting various melts.

1 is a schematic diagram of a casting device according to an embodiment of the present invention.

First, with reference to Figure 1, a casting device according to an embodiment of the present invention will be described.

Referring to FIG. 1, the casting device according to an embodiment of the present invention includes a mold 200 and a plurality of draw machines arranged to form a path (L) through which the cast slab (S) is drawn from the lower side of the mold (200). 400), and a state measuring device 500 disposed between two drawing machines selected from among the plurality of drawing machines 400 and contacting the cast steel S to measure the casting state of the cast steel S. At this time, the casting state of the cast steel (S) may include the temperature of the cast steel (S). Of course, the casting state of the cast steel (S) may further include the thickness of the solidified layer (S ₁ ) of the cast steel (S). Meanwhile, the temperature of the cast steel (S) may be the surface temperature of the cast steel (S). Hereinafter, the surface temperature of the cast steel (S) is simply referred to as the temperature of the cast steel (S).

In addition, the casting device according to an embodiment of the present invention is disposed on the upper side of the mold 200 so as to supply molten material, such as molten steel, to the mold 200, molten steel is accommodated therein, and a tapping hole is formed in the lower portion. A controller 600 for controlling the operation of the tundish 100, the submerged nozzle 300, which is mounted on the tapping hole at the bottom of the tundish 100 and disposed on the upper part of the mold 200, and the state measuring device 500. ) may include.

The configuration and method of the tundish 100, mold 200, and immersion nozzle 300 may vary. In addition, the configuration and method of continuous casting equipment at a steel mill can be applied to these configurations and methods. Hereinafter, detailed descriptions thereof will be omitted in order not to obscure the gist of the present invention.

The drawing machine 400 serves to draw the cast slab (S) from the mold 200 and to perform secondary cooling of the drawn slab (S). In addition, the drawing machine 400 may also serve to reduce the cast steel (S) undergoing secondary cooling.

The draw machine 400 may be disposed on the lower side of the mold 200. At this time, the number of drawing machines 400 may be plural. A plurality of drawing machines 400 may be arranged along a defined path (L). The path L may include multiple sections. Specifically, the path L may include a vertical section, a curved section, and a horizontal section.

The vertical section may be a section through which the cast piece (S) passes vertically, and may extend in the vertical direction (Z) from the lower side of the mold 200. The curved section may be a section in which the posture of the cast piece (S) changes from a vertical state to a horizontal state, and may be obliquely extended in the up-down direction (Z) and the front-back direction (X) from the lower side of the vertical section. Meanwhile, the upper part of the curved section can be divided into a bending section, and the lower part can be divided into an unbending section. The horizontal section may be a section through which the cast piece (S) passes in a horizontal state. The horizontal section is connected to the lower part of the curved section and may extend in the front-to-back direction (X).

The arrangement structure of the drawing machine 400 may be different depending on the section in which it is placed. Additionally, the state measuring device 500 may be placed on the drawing machine 400 in the horizontal section. Therefore, hereinafter, the drawing machine 400 will be described based on the horizontal section. Of course, the contents described below can be similarly or equally applied to the drawing machine 400 disposed in the vertical section and the curved section.

Figure 2 is a schematic diagram showing how a state measuring device disposed in a drawing machine according to an embodiment of the present invention is operated to bring the measuring part into contact with the surface of the cast steel. At this time, Figure 2 is an enlarged view of part A of Figure 1.

Referring to FIGS. 1 and 2 , the drawing machine 400 may include an upper frame 410 and a lower frame 420 and a plurality of rollers 430 that are opposed to each other in the vertical direction (Z). At this time, the plurality of rollers 430 are mounted on the lower part of the upper frame 410, and the upper roller 431, which can be in contact with the upper surface of the cast steel (S), is mounted on the upper part of the lower frame 420 and can contact the upper surface of the cast steel (S). It may include a lower roller 432 that can be in contact with the lower surface of the. In addition, the drawing machine 400 includes a rod (not shown) mounted to connect the upper frame 410 and the lower frame 420, and cast steel ( S) may include an upper nozzle (not shown) disposed on the upper frame 410 side and a lower nozzle (not shown) disposed on the lower frame 420 side to spray coolant.

The drawing machine 400 can draw and reduce the cast steel (S) by drawing the cast steel (S) between the upper roller 431 and the lower roller 432 and passing it in the casting direction. In addition, the draw machine 400 can secondary cool the cast steel (S) by spraying coolant to the cast steel (S) using the upper nozzle and the lower nozzle. The casting direction may be parallel to the front-back direction (X) and away from the mold 100.

The cast steel (S) may have a predetermined width in the left-right direction (Y), a predetermined thickness in the up-and-down direction (Z), and a predetermined length in the front-back direction (X). Meanwhile, hereinafter, the left-right direction (Y) may be referred to as the width direction, and the front-back direction (X) may be referred to as the casting direction or the longitudinal direction.

The cast steel (S) may have a solidified layer (S ₁ ) formed on the surface and an unsolidified layer (S ₂ ) formed inside, and solidification of the unsolidified layer (S ₂ ) may proceed in the direction from the surface to the inside. You can. Accordingly, the thickness of the solidified layer (S ₁ ) may become thicker in the casting direction, and the thickness of the unsolidified layer (S ₂ ) may become thinner. The point at which solidification of the unsolidified layer (S ₂ ) is completed is referred to as the solidification completion point (P). Meanwhile, for quality control of the cast steel, the temperature of the cast steel (S) undergoing secondary cooling and the thickness of the solidified layer (S ₁ ) of the cast steel (S) must be measured.

At this time, in order to measure the temperature of the cast steel (S), the measuring part 520 is brought into contact with the cast steel (S), and the upper roller 431 and the lower roller ( 432) It is possible to pass the cast steel (S) and the measuring part 520 between them. Accordingly, as the measuring unit 520 is pressed toward the inner side of the cast slab (S), it can dig into the scale C generated on the surface of the cast slab (S) and directly contact the surface of the cast slab (S). Accordingly, the measuring unit 520 can accurately measure the temperature of the cast slab (S) from the surface of the cast slab (S). At this time, digging may mean breaking or pushing the scale (C) and advancing toward the surface of the cast steel to reach the surface of the cast steel.

In addition, in order to measure the thickness of the solidified layer (S ₁ ) of the cast slab (S), the core portion 530 is seated on the cast slab (S), the core portion 530 is moved together with the cast slab (S), and the upper roller 431 ) and the lower roller 432 can pass the cast steel (S) and core portion 530. Accordingly, the core portion 530 may be compressed from the surface of the cast slab (S) to the inside of the cast slab (S), and cracks may occur inside the cast slab (S). At this time, cracks may occur on the inner surface of the solidified layer (S ₁ ) of the cast slab (S) facing the unsolidified layer (S ₂ ) of the cast slab (S). That is, cracks may occur at the boundary between the solidified layer (S ₁ ) and the unsolidified layer (S ₂ ). Therefore, the location where the crack occurs may be the boundary between the solidified layer (S ₁ ) and the unsolidified layer (S ₂ ).

On the other hand, it is difficult for the worker to contact the measuring portion 520 with the surface of the cast steel (S) and maintain contact between the casting portion (S) and the measuring portion (520). For example, an operator must approach the cast piece (S) being cast and accurately insert the measuring part 520 between the cast piece (S) and the upper roller 431, and continue to measure the measuring part 520 in accordance with the drawing speed of the cast piece (S). You have to push it in.

In addition, it is also difficult for the worker to seat the core portion 530 on the cast steel (S). For example, in order for the worker to seat the core portion 530 on the cast steel (S), the worker must go up to the drawing machine 400 at the point where the core portion 530 is to be seated. Accordingly, the worker must drop the core portion 530 toward the cast steel (S) from a height of about 2 m or more from the cast steel (S).

Therefore, when the measuring part 520 is brought into contact with the surface of the cast steel (S) and the core part 530 is seated, there is a risk of the worker being exposed to the narrow space and harsh environment around the drawing machine 400. In addition, the measuring unit 520 may not be accurately inserted between the cast steel (S) and the upper roller 431 and may miss the cast steel (S) or the upper roller (431). In addition, the core portion 530 may not be stably seated on the cast slab (S), may accelerate and collide with the surface of the cast slab (S), and may roll down toward the edge of the cast slab (S) due to the impact generated at this time.

Accordingly, in an embodiment of the present invention, it is possible to form a state measuring device 500 that allows the measuring part 520 to stably contact the cast steel (S). In addition, by placing the state measuring device 500 on the path L, instead of the method in which the operator drops the measuring part 520, the measuring part 520 can be measured up to the surface of the cast steel (S) using the state measuring device 500. ) can be developed to make stable contact.

In addition, the state measuring device 500 according to an embodiment of the present invention may stably seat the core portion 530 on the cast steel (S) using the operation of expanding the measuring portion 520. Accordingly, by arranging the condition measuring device 500 on the path L, instead of the method in which the worker drops the core 530, the condition measuring device 500 is used to measure the core 530 up to the surface of the cast steel S. It can be lowered and placed stably.

That is, the condition measuring device 500 serves to accurately measure the temperature of the cast slab (S) from the surface of the cast slab (S) by contacting the measuring unit 520 with the cast slab (S). In addition, the condition measuring device 500 generates a crack for measuring the thickness of the solidified layer (S ₁ ) of the cast slab (S) inside the cast slab (S) by seating the core portion 530 on the cast slab (S). ) serves to measure the thickness of the solidification layer (S ₁ ).

The state measuring device 500 may be placed upstream from the solidification completion point (P). Here, the upstream side may be a location where the cast piece (S) passes relatively first. Meanwhile, the solidification completion point (P) can be confirmed from the operation performance obtained while performing the process of casting the cast steel (S) multiple times, or the characteristics of the steel type of the cast steel (S), the casting speed in the draw machine 400, and the coolant. It can be predicted from operating conditions such as injection amount.

The number of condition meters 500 may vary. For example, there may be one or more state measuring devices 500. When the number of state measuring devices 500 is plural, the plurality of state measuring devices 500 may be continuously arranged along the path L with the drawing machine 400 interposed therebetween. Below, the detailed structure of the state measuring device 500 will be described.

Figure 3 is a schematic diagram of a condition measuring device according to an embodiment of the present invention, and Figure 4 is a schematic diagram of a measuring portion and a core portion according to an embodiment of the present invention. At this time, Figures 4 (a), (b), and (c) are a top view, a side view, and a bottom view to show the core part connected to the measurement part.

Referring to Figures 2 and 3, the state measuring device 500 according to an embodiment of the present invention is for measuring the casting state of the cast steel (S), and is directed toward the path (L) where the cast steel (S) is drawn. The main body part 510 is disposed, is installed on the main body part 510 so that it can be input into the path (L), and includes a measuring part 520 for measuring the temperature of the cast steel (S) by contacting the cast steel (S). do. At this time, the casting state may include the temperature of the cast steel (S).

In addition, the condition measuring device 500 according to an embodiment of the present invention is supported on the measuring part 510 and is seated on the cast slab (S) to further include a core portion 530 for generating cracks inside the cast slab (S). It may also be included. In this case, the casting state may include the temperature of the cast steel (S) and the thickness of the solidified layer (S ₁ ) of the cast steel (S).

On the other hand, the condition measuring device 500 according to an embodiment of the present invention has a fixing part 540 formed on the bottom surface of the core portion 530 so that it can be fixed to the surface of the cast slab (S) using the weight of the core portion 530. ) may further be included. Additionally, the state measuring device 500 may further include a control unit (not shown) for controlling the operation of the main body 510.

Hereinafter, the condition measuring device 500 according to an embodiment of the present invention includes a main body 510, a measuring part 520, a core part 530, a fixing part 540, and a control part. is explained in detail. However, the condition measuring device 500 according to an embodiment of the present invention includes a main body portion 510, a measuring portion 520, and a control portion, and may not include the core portion 530 and the fixing portion 540. Of course, what will be described below is that the condition measuring device 500 according to an embodiment of the present invention includes a main body 510, a measuring part 520, a control part, a core part 530, and a fixing part 540. Even if it is not done, it can be applied in the same or similar way.

The main body portion 510 serves to accommodate the measuring portion 520 and the core portion 530, unfolds the measuring portion 520, and lowers the core portion 530. The main body 510 may be disposed on the upper side of the path L. Additionally, the main body portion 510 may be disposed between the upper frames 410 of two drawing machines 400 selected from among the plurality of drawing machines 400. Specifically, the main body portion 510 is between two upper frames 410 located on both sides of the point where the measuring portion 520 is brought into contact with the cast steel (S) and the core portion 530 is seated on the cast steel (S). can be placed. At this time, the main body 510 may be arranged to be spaced apart from the two upper frames 410 in the left and right direction (Y). Of course, the main body 510 may be seated on opposite ends of the two upper frames 410. Meanwhile, the length of the main body 510 can be adjusted in the width direction of the path L. At this time, the width direction may be parallel to the left and right direction (Y).

The main body 510 includes a body 511, a storage roll 512 rotatably disposed on the body 511, and a storage roll 512 on which the first region R1 of the measurement unit 520 is wound and supported on the outer surface. Connected to (512), a motor 513 for rotating the storage roll 512 so that the measuring part 520 can be wound and stored or unwound and introduced, and a body so as to cross the upper side of the path L in the width direction. A support arm 514 protrudes from (511), the length of which is adjustable, and rotatably disposed at the end of the support arm 514 to support the second region (R2) of the measuring unit 520, and has an outer surface. Accordingly, a switching roll 515 may be included to change the deployment direction of the measuring unit 520.

The body 511 may support the entire structure of the main body 510. The body 511 may extend in the vertical direction (Z). The body 511 may have a square pillar shape. Of course, the shape of the body 511 may vary. A plurality of protrusions may be formed on the upper part of the body 511. The plurality of protrusions may be spaced apart from each other in the front-back direction (X). The storage roll 512 may be rotatably mounted on surfaces of the plurality of protrusions facing each other.

The storage roll 512 stores the measuring part 520 on the outer peripheral surface, unwinds the measuring part 520 from the outer peripheral surface, and rolls up the measuring part 520. At this time, the act of the storage roll 512 unwinding and lowering the measurement unit 520 may be referred to as unfolding, and the act of the storage roll 512 winding up the measurement unit 520 may be referred to as storage. The storage roll 512 may extend in the front-back direction (x) and may have a cylindrical shape. The storage roll 512 may be rotatably mounted on a plurality of protrusions formed on the upper part of the body 511. The motor 513 is used to rotate the storage roll 512, can be connected to the storage roll 512, and can be mounted on the upper part of the body 511, for example, on at least one of the plurality of protrusions. Of course, the location where the motor 513 is mounted may vary. The motor 513 may receive power from a battery (not shown), and its operation may be controlled by a controller (not shown).

The support arm 514 serves to support the switching roll 515. The support arm 514 may extend from the body 511 in the width direction between a plurality of protrusions on the upper part of the body 511. At this time, the support arm 514 may extend inclined upward so that its height increases as the distance from the body 511 increases. Additionally, the support arm 514 may cross the upper side of the path L in the width direction. Additionally, the support arm 514 may include a plurality of cylinders interconnected to enable length adjustment in the width direction of the path L. Meanwhile, the body 511 may be spaced apart from the center of the width direction of the path L by the length of the support arm 514 extended.

The switching roll 515 supports the second region (R2) of the measuring unit 520 and serves to change the development direction of the second region (R2) from the width direction to the vertical direction (Z). The diverting roll 515 may be spaced apart from the receiving roll 512 . Additionally, the diverting roll 515 may be rotatably mounted on the end of the support arm 514.

The measuring unit 520 contacts the surface of the cast slab (S) and serves to measure the temperature of the cast slab (S) from the surface of the cast slab (S). Of course, the measuring part 520 may also serve to lower the core part 530. That is, when the measuring part 520 is deployed and brought into contact with the surface of the cast slab (S), the core part 530 connected to the measuring part 520 is also lowered along the expansion of the measuring part 520 to the surface of the cast slab (S). It can be settled in . That is, the core portion 530 may serve as a weight for deployment of the measuring portion 520.

Of course, if the state measuring device 500 does not include the core part 530, the measuring part 520 is deployed so that the measuring part 520 can be stably lowered using the weight of the measuring part 520 itself. A weight member (not shown) may be further provided at the end of the measuring unit 520 in the direction. Weight members may have various forms, such as sheaths, fillers, blocks, rings, hooks, plates, etc. Of course, the size and thickness of the contact member 522 may be adjusted so that the contact member 522 can function as a weight member instead of the weight member.

The measuring unit 520 may be installed in the main body 510 so that it can be deployed from the main body 510 and introduced into the path L. The measuring unit 520 can measure the temperature of the cast steel (S) by contacting the cast steel (S). The measuring part 520 is connected to the thermocouple wire 521, the contact member 522 formed at the end of the thermocouple wire 521 to be located on the bottom surface of the core part 530, and the thermocouple wire 521, and the cast steel (S ) may include a data collector 523 for measuring the temperature, and a compensation wire 524 for connecting the thermocouple wire 521 to the data collector 523.

The thermocouple wire 521 is used to measure the temperature from the surface of the cast steel (S) by contacting the surface of the cast steel (S). A contact member 522 may be formed at the end, and a plurality of thermocouples are used at the rest except for the end. It may include wire, sheath, and insulating powder. A plurality of thermocouple wires may be accommodated in a sheath or a metal protection tube, insulated from the sheath by insulating powder, and the thermocouple wires may be insulated from each other.

The thermocouple wire 521 has a first region (R1) wound and supported by the storage roll 512, and a second region (R2) that can be expanded from the storage roll 512 and has a core portion 530 supported at the end. It can be included. At this time, the first region R1 may be supported on the outer peripheral surface of the storage roll 512 and may be wound or unwound by rotation of the storage roll 512. The second region (R2) can be arranged to pass between the two upper frames 410, and its height can be adjusted by winding and unwinding the first region (R1). Meanwhile, as the thermocouple wire 521 is unwound from the storage roll 512, the length of the second region (R2) may gradually become longer, and the length of the first region (R1) may gradually become shorter. The thermocouple wire 521 is separated from the storage roll 512 when unwinding is completed. At this time, the length of the second region R2 may be the length of the thermocouple wire 521. Meanwhile, when the thermocouple wire 521 is completely unwound, the connection with the compensation conductor 524 may also be released.

The time for measuring the temperature of the cast steel (S) can be adjusted by adjusting the length of the thermocouple wire 521. That is, as the length of the thermocouple wire 521 increases, the temperature of the cast steel S can be measured for a long time by maintaining connection with the compensation conductor 524 for a long time.

Meanwhile, the thermocouple wire 521 may have a length equal to the distance from the end of the draw machine 400 from which the cast steel (S) is discharged to the location where the state measuring device 500 is installed. Of course, the length of the thermocouple wire 521 may vary. For example, the thermocouple wire 521 may have a length equal to the distance from the solidification completion point (P) to the location where the state measuring device 500 is installed. Additionally, the thermocouple wire 521 may have a length equal to the distance from a point between the solidification completion point (P) and the end of the draw machine 400 to the location where the state measuring device 500 is installed. In addition, the temperature measurement by the thermocouple wire 521 is performed after the contact member 522 at the end of the thermocouple wire 521 contacts the surface of the cast steel (S), and then the unwinding of the thermocouple wire 521 is completed and compensation is performed. The connection between the conductive wire 524 and the thermocouple wire 521 may be disconnected.

The contact member 522 is for connecting the plurality of wires of the thermocouple wire 521 to each other and contacting the plurality of wires with the surface of the cast steel (S). The plurality of thermocouple wires are in contact at the end of the thermocouple wire 521. can be formed by The contact member 522 can reach the cast steel (S) by lowering the second region (R2) of the thermocouple wire 522, and is pressed down by the upper roller 431 to dig into the scale (C) and penetrate the cast steel ( S) may contact the surface. On the other hand, when the condition measuring device 500 does not include the core portion 530, the above-described weight member may be provided around the contact member 522, for example, at the boundary between the contact member 522 and the thermocouple wire 521. .

The data collector 523 is used to measure the temperature of the cast steel (S) by measuring the thermoelectric power formed in the wire of the thermocouple wire 521, and is mounted on the main body 510 or installed on the main surface of the main body 510. can be placed. The compensation wire 524 is used to electrically connect the data collector 523 and the thermocouple wire 521, and may have an extra length to maintain the connection with the thermocouple wire 521 even when the storage roll 512 rotates. and can be rotatably connected to the terminal of the data collector 523. In addition, the compensation conductor 524 is connected to the thermocouple wire 521 in a plug and jack structure so that the connection with the thermocouple wire 521 can be disconnected when the thermocouple wire 521 is completely unwound and separated from the storage roll 512. can be connected

Referring to Figures 3 and 4 (a), (b), and (c), the core portion 530 is seated on the cast steel (S) and is compressed to generate a crack (C) inside the cast steel (S). It plays a role. The core portion 530 may be formed in a disk shape with an area larger than the thickness, and a through hole H may be formed at the center. The core portion 530 may have a thickness that allows it to be inserted between the cast slab (S) and the upper roller 431 to press down the cast slab (S). In addition, the core portion 530 may have an area that allows a sufficient number of cracks C to be generated within the cast steel S with a sufficient distribution range. The core portion 530 may include the same material as the steel type of the cast steel (S), or may include a metal material with higher strength than the steel type of the cast steel (S).

The core portion 530 may be supported on the measuring portion 520, and may be seated on the cast slab (S) by the expansion of the measuring portion 520, thereby generating a crack inside the cast slab (S). A plurality of core portions 530 are provided according to the thickness of the cast slab (S), and can be replaced according to the thickness of the cast slab (S). At this time, the measuring unit 520 may be provided in the same number as the core unit 530, and may be replaced together with the core unit 530 when the core unit 530 is replaced.

The plurality of core portions 530 may include a first core portion having a thickness of 8 mm to 10 mm, a second core portion having a thickness of 10 mm to 12 mm, and a third core portion having a thickness of 12 mm to 14 mm. For example, the first core portion can be used when the thickness of the cast steel S is 250 mm or less, and the second core portion can be used when the thickness of the cast steel S is greater than 250 mm or less than 300 mm. Additionally, the third core portion can be used when the thickness of the cast steel (S) is greater than 300 mm and less than or equal to 400 mm.

In other words, when the thickness of the cast steel (S) is 250 mm or less, cracks can be smoothly created only when the cast steel is pressed down with a core having a thickness of 10 mm or more. In addition, when the thickness of the cast steel (S) is 250 mm or less, if a core with a thickness of 12 mm or more is used, it may be difficult for the core to pass between the cast steel (S) and the roller. Likewise, depending on the thickness of the cast slab (S), the thickness of the core portion can be adjusted to a thickness range that can smoothly generate cracks and pass between the cast slab and the roller.

Meanwhile, the core portion 530 may have a different posture depending on its height. For example, the core portion 530 is supported by the measuring portion 520 and may have an attitude aligned in the vertical direction (Z) at a height spaced apart from the upper side of the cast steel (S). In addition, when the core portion 530 is seated on the cast slab (S) and positioned at the height of the outermost surface of the cast slab (S) or at the height of the surface of the cast slab (S), it has an attitude aligned in the front-back direction (X). You can. Below, the structure of the core portion 530 will be described in detail based on the posture in which the core portion 530 is seated on the cast piece (S) and aligned in the front-back direction (X) at the height of the outermost surface of the cast piece (S). .

Meanwhile, the outermost surface of the cast slab (S) and the surface of the cast slab (S) are distinct surfaces, and the outermost surface of the cast slab (S) refers to the surface of the scale (C) formed on the cast slab (S). You can. At this time, the actual surface of the cast steel (S) may be located below the outermost surface of the cast steel (S). In addition, the actual surface of the cast steel (S) can be simply referred to as the surface of the cast steel (S).

Referring to FIG. 4, the core portion 530 may have a bottom surface 531 and an upper surface 532 that face each other, and a side surface 533 connecting the bottom surface 531 and the upper surface 532. At this time, a portion of the upper surface 532 may be formed to be inclined. Accordingly, the upper surface 532 may include a flat surface 532a and an inclined surface 532b. At this time, the inclined surface 532b serves to reduce the thickness of the core portion 530 and smoothly inserts the core portion 530 between the cast steel (S) and the upper roller 431, and is located at the front of the core portion 530. It may be formed in an area, and may be formed at an angle so that the farther away it is from the end of the measuring unit 520, the closer it is to the bottom surface 531. The front area may be the area that first contacts the cast steel (S) when the core portion 530 is lowered while hanging on the measuring portion 520 and placed in the vertical direction. In addition, the front area first passes between the upper roller 431 and the cast steel (S) when the core portion 530 seated on the cast steel (S) moves along with the cast steel (S) in the direction in which the cast steel (S) is drawn. It could be an area. Meanwhile, the inclined surface 532b may also be referred to as a chamfered surface.

When the core portion 530 is compressed, the through hole (H) serves to receive the surface of the cast piece (S) into the interior and allow the compressed core portion (530) to be firmly coupled to the surface of the cast piece (S). . The through hole (H) may be formed to penetrate from the bottom surface 531 to the upper surface 532 of the core portion 530. By the through hole (H), the movement of the core portion 530 can be effectively prevented by the surface of the cast steel (S) that is convexly introduced into the through hole (H) after the core portion 530 passes the first roller. . In addition, while the movement of the core portion 530 is effectively prevented by the through hole (H), the core portion 530 moves in the casting direction and is gradually compressed deeper, causing cracks generated in the cast steel (S) to form in the cast steel (S). It propagates inward, that is, in the thickness direction, and may increase in size. Accordingly, the location of the crack can be easily found when cutting the cast steel (S) later.

The inner diameter of the through hole (H) may be 50% or more of the outer diameter of the core portion 530. Additionally, the distance between the edge of the through hole (H) and the edge of the core portion 530 may be 20 mm or more. At this time, the inner diameter of the through hole (H) must be formed to be 50% or more of the outer diameter of the core portion 530, so that the depth at which the cast steel (S) is depressed by the core portion 530 is in the left-right direction (Y) and the front-back direction (X ) can suppress or prevent deviations from occurring. In addition, the distance between the edge of the through hole (H) and the edge of the core portion 530 must be 20 mm or more so that cracks can smoothly occur inside the cast steel (S).

The core portion 530 can be stably seated on the cast slab (S) and can stably pass between the roller and the cast slab (S) due to the structure and shape described above. Accordingly, stable work is possible through remote operation of the main body 510 without operator observation or intervention.

Meanwhile, a concave groove may be formed in the rear area of the bottom surface 531 of the core portion 530, and the contact member 522 may be accommodated in the concave groove. At this time, the upper part of the contact member 522 is accommodated in the concave groove, and the lower part of the contact member 522 protrudes from the concave groove, so that it may protrude downward from the bottom surface 531. By positioning the contact member 522 on the bottom surface of the core portion 530 in this way, temperature measurement of the cast steel and crack formation for measuring the thickness of the solidified layer can be performed simultaneously and at the same location on the cast steel (S).

The fixing part 540 is for fixing the bottom surface 531 of the core part 530 on the cast steel (S), and may be formed on the bottom surface 531 of the core part 530, and may hold the weight of the core part 530. It can be fixed on the cast steel (S) using a plurality of fixing parts 540. A plurality of fixing parts 540 may be arranged along the perimeter of the bottom surface 531 of the core part 530. The fixing part 540 may protrude so that its width becomes narrower as it moves away from the bottom surface 531 of the core part 530. Accordingly, the weight of the core part 530 is concentrated on the narrow width of the lower part of the fixing part 540, and a large pressure is used to partially dig into the outermost surface of the cast steel (S), that is, the scale (C) surface, and to the inside of the scale (C). It may be fixed, or it may be fixed by penetrating the scale (C) surface and contacting or embedded in the surface of the cast plate (S) below it. Meanwhile, the lower end of the fixing part 540, where the width is narrowed, may be referred to as the tip part. Additionally, the fixing part 540 may be referred to as a spike.

The control unit (not shown) serves to control the operation of the motor 513 and the support arm 514. The control unit can receive an operation schedule from the casting device while the casting device is performing the process of casting the cast steel (S), and operates the motor 513 at a designated time according to the input operation schedule to collect the storage roll 512. By unwinding the thermocouple wire 521 from , the thermocouple wire 521 can be deployed on the cast steel (S), and the core portion 530 can be seated on the cast steel (S). At this time, the position at which the thermocouple wire 521 is deployed and the lowering position of the core portion 530 can be adjusted by adjusting the length of the support arm 514. Additionally, the control unit may detect that the unwinding of the thermocouple wire 521 is complete and stop the operation of the motor 513. Methods for detecting completion of unwinding of the thermocouple wire 521 may vary. For example, by observing the outer peripheral surface of the storage roll 512 with a camera sensor, or by detecting that thermoelectric power is not input to the data collector 523 by disconnecting the compensation conductor 524 and the thermocouple wire 521, the thermocouple wire ( 521) can be detected to be complete. For this purpose, a control program may be provided in the control unit. Of course, the control unit may be remotely controlled by an operator.

Meanwhile, the control unit can detect breakage or damage of the thermocouple wire 521 and stop the operation of the motor 513. For example, if the thermocouple wire 521 is broken or damaged, the value of thermoelectromotive force input to the data collector 523 may change significantly. Accordingly, when the value of thermoelectric power input to the data collector 523 changes significantly beyond the preset reference range, the control unit detects this, determines that the state of the thermocouple wire 521 is abnormal, and operates the motor 513. can be stopped.

Meanwhile, the state measuring device 500 may further include a cutter (not shown). The cutter may be placed on the support arm 514 and may be placed to surround the thermocouple wire 521. The cutter may be operated under the control of the control unit, and if the state of the thermocouple wire 521 is determined to be abnormal, the cutter may be operated under the control of the control unit to cut the second region R2 of the thermocouple wire 521.

The controller 600 is for integrated control of the control unit provided in each of the plurality of state measuring devices 500 when the number of the state measuring devices 500 is plural. For example, the plurality of state measuring devices 500 are measured according to the casting speed of the cast steel S. The input timing of each measuring unit 200 and the core unit 530 provided in the plurality of state measuring devices 500 can be adjusted by sequentially operating the control unit to control the operating timing of the units 500 equally or differently. At this time, in order to easily distinguish the controller 600 from the above-described control unit, the controller 600 is hereinafter referred to as the integrated controller 600.

The integrated controller 600 can be connected to a plurality of control units by wire or wirelessly, and can operate a plurality of remote control units in a predetermined order or simultaneously. For example, after casting is started and the initial cast connected to the dummy bar (not shown) passes through the lower side of the plurality of condition measuring instruments 500, a plurality of condition measuring instruments are measured in order from the upstream side to the downstream side of the cast steel S based on the casting direction ( By sequentially operating 500, the plurality of measuring parts 520 and the plurality of core parts 530 can be sequentially seated on the cast steel (S). In addition, the plurality of condition measuring devices 500 may be operated simultaneously to seat the plurality of measuring parts 520 and the plurality of core parts 530 on the cast steel (S) at the same time.

Figures 5 to 7 are schematic diagrams for explaining a method of measuring the surface temperature of a cast slab using a measuring unit according to an embodiment of the present invention and a method of creating a crack inside the cast slab. Figure 8 is a schematic diagram illustrating a method of measuring the thickness of the solidification layer by measuring the depth of the crack on the cut surface of the cast steel where the crack was created by the deep portion according to an embodiment of the present invention.

Hereinafter, the operation of the state measuring device 500 according to an embodiment of the present invention will be described.

When casting begins and the dummy bar (not shown) passes the position of the condition measuring device 500, the measuring unit 520 is deployed (see FIG. 2) to measure the temperature of the cast steel (S), and the The end of the measuring part 520 can be seated on the top (see FIG. 5). That is, the contact member 522 can be seated on the cast steel (S). At this time, the end of the measuring part 520 can be prevented from shaking or being separated from the cast steel (S) by using a weight member provided in the measuring part 520 or using the core part 530. In addition, when using the core portion 530, the end of the measuring portion 520 can be more effectively fixed on the cast steel (S) using the fixing portion 540.

In addition, the measuring unit 520 can be moved together with the cast slab (S) and pressed down to be positioned below the outermost surface of the cast slab (S), such as the scale (C) surface (see FIG. 5). That is, the measuring unit 520 can be pressed down until the height (T ₅₂₀ ) of the end (contact member) of the measuring unit 520 becomes lower than the height (Tc) of the scale (C) surface. At this time, the height (T ₅₂₀ ) of the end (contact member) of the measuring part 520 may be lower than the height (Ts) of the actual surface of the cast steel (S). Of course, the height (T ₅₂₀ ) of the end (contact member) of the measuring part 520 may be the same as the height (Ts) of the actual surface of the cast steel (S). Thereafter, while continuing to move the measuring unit 520, the cast steel (S) is removed from the end (contact member) of the measuring unit 520 until the unwinding of the thermocouple wire 521 is completed and the compensation conductor 524 is disconnected. ), for example, the surface temperature of cast steel (S) can be accurately measured. At this time, the above-mentioned height may be the height from the lower surface of the cast steel (S) or the height from the floor on which the lower frame 420 at the position of the condition measuring device 500 is installed.

In addition, in order to measure the thickness of the solidified layer (S ₁ ) of the cast slab (S) along with the operation of the above-described measuring unit 520, the core portion 530 can be seated on the cast slab (S) (FIGS. 2 and 2) 5). That is, the core portion 530 can be seated on the cast slab (S) using the expansion of the measuring portion 520. Thereafter, the core portion 530 may be moved together with the cast steel (S) and the cast steel (S) and core portion (530) may be passed between the upper roller 431 and the lower roller 432 (see FIG. 6). Accordingly, the core portion 530 can be pressed down from the cast slab (S) toward the inside of the cast slab (S), and a crack can be generated inside the cast slab (S). Specifically, the crack (C) may occur on the inner surface of the solidified layer (S ₁ ) of the cast slab (S) facing the unsolidified layer (S ₂ ) of the cast slab (S). In other words, cracks (C) may occur at the boundary between the solidified layer (S ₁ ) and the unsolidified layer (S ₂ ). Therefore, the location where the crack (C) occurs may be the boundary between the solidified layer (S ₁ ) and the unsolidified layer (S ₂ ).

Meanwhile, the boundary between the solidified layer (S ₁ ) and the unsolidified layer (S ₂ ) moves toward the center of the cast steel (S) while the cast steel (S) continues to be drawn in the casting direction, and then solidifies the cast steel (S). Once completed, it may disappear inside the cast piece (S). However, the cracks generated inside the cast slab (S) by the core portion 530 may not change in depth even while the cast slab (S) is continuously drawn in the casting direction. Therefore, by checking the depth (T) of the crack (D), the boundary between the solidified layer (S ₁ ) and the unsolidified layer (S ₂ ) at the point where the core portion 530 is seated can be confirmed.

Therefore, when the core portion 530 is seated and the area to be compressed is continuously drawn in the casting direction and discharged from the path (L), the surrounding position of the core portion 530 or the position of the core portion 530 is determined in the discharged cast steel (S). By cutting, the depth (T) from the top of the cut surface corresponding to the surface of the cast steel (S) to the crack (C) can be measured (see Figure 8).

At this time, since the solidification of the cast steel (S) has been completed, the boundary between the solidified layer (S ₁ ) and the unsolidified layer (S ₂ ) is not visible on the cut surface, but the location where the crack (D) was formed is the solidified layer (S) at that point in time. ₁ ) and the unsolidified layer (S ₂ ), by checking the crack (D), the solidified layer (S ₁ ) and the unsolidified layer (S ₂ ) at the time the crack (D) is generated You can check the boundary.

That is, the depth (T) of the crack (D) is measured from the top of the cut surface corresponding to the surface of the cast steel (S), and the measured depth (T) is used to connect the deep portion 530 in the path (L) to the cast steel (S). It can be determined by the thickness of the solidified layer (S ₁ ) at the point of seating.

At this time, the depth (T) of the crack (C) can be measured based on the top or bottom of the crack (D), and the depth (T) of the crack (D) can be measured based on the center between the top and bottom of the crack (D). ) can also be measured. In addition, if there are multiple cracks (D), one crack (D) may be selected to measure the depth (T) of the crack (D), and the depth (D) may be measured for each of the plurality of cracks (D). And you can also find the average value.

Hereinafter, a casting method according to an embodiment of the present invention will be described. At this time, content that overlaps with the above description of the casting device and state measuring device according to an embodiment of the present invention will be briefly described or the description will be omitted.

In addition, hereinafter, an embodiment of the present invention will be described based on the case where the number of state measuring devices 500 is one. Of course, even when the number of state measuring devices 500 is plural, the contents described below can be applied in the same or similar manner.

The casting method according to an embodiment of the present invention includes a process of drawing a cast slab (S) from the mold 200, a process of advancing solidification from the surface of the cast slab (S) to the inside, and a condition measuring device ( 500), and measuring the temperature of the surface of the cast steel (S) using a condition measuring device (500).

First, the cast steel (S) is drawn from the mold 200. Molten material, such as molten steel, is injected into the mold 200 and first cooled with the cast steel (S). At this time, a solidified layer (S 1 ) may be formed on the surface side of the cast slab (S ₁ ), and an unsolidified layer (S ₂ ) may be formed inside the cast slab (S) surrounded by the solidified layer (S ₁ ). In addition, the cast steel (S) can be discharged to the lower side of the mold 200 and drawn by the drawing machine 400.

Afterwards, solidification progresses from the surface of the cast steel (S) to the inside. That is, while moving in the casting direction along the path L using the draw machine 400, coolant is sprayed on the cast steel S to perform secondary cooling. As the unsolidified layer (S ₂ ) inside the cast steel (S) gradually solidifies by secondary cooling, the thickness of the solidified layer (S ₁ ) increases and the thickness of the unsolidified layer (S ₂ ) may decrease. .(see Figure 1)

Afterwards, the condition measuring device 500 is brought into contact with the surface of the cast steel (S). Here, the process of contacting the condition measuring device 500 with the surface of the cast steel (S) is a process of seating the contact member 522 and the core portion 530 provided at the end of the state measuring instrument 500 on the cast steel (S). It may include a process of moving the contact member 522 and the core portion 530 together with the cast steel (S) in the casting direction.

At this time, the process of seating the contact member 522 and the core portion 530 on the cast steel (S) may be performed at the location where the condition measuring device 500 is installed, for example, at a location between the two upper frames 410, and the contact point The process of moving the member 522 and the core portion 530 together with the cast steel (S) in the casting direction may be performed throughout the section from the position where the state measuring device 500 is installed to the position where the drawing machine 400 ends. That is, the process of moving the contact member 522 and the core portion 530 together with the cast steel (S) in the casting direction may be performed at the location where the state measuring device 500 is installed and downstream thereof.

A process of seating the contact member 522 and the core portion 530 provided at the end of the condition measuring device 500 on the cast steel (S) is performed. The control unit operates the motor 513 to rotate the storage roll 512, and the thermocouple wire 521 is unwound from the storage roll 512 (see Fig. 2). That is, the thermocouple wire 521 is expanded from the main body 510 to the cast steel (S). Accordingly, the thermocouple wire 521 may pass between the two upper frames 410 in the vertical direction (Z) and then descend. In addition, from this, the contact member 522 formed at the end of the thermocouple wire 521 and the core portion 530 connected to the thermocouple wire 521 can be lowered, and the contact member 522 and core portion 530 can be lowered using the cast steel (S). ) can be placed on the

Meanwhile, when seating the contact member 522 and the core portion 530 on the cast plate (S), the bottom of the core portion 530 is fixed using the fixing portion 540 formed on the bottom surface 531 of the core portion 530. Surface 531 can be fixed on the cast plate (S). For example, by seating the fixing part 540 on the cast plate (S) before the bottom surface 531 of the core part 530, the weight of the core part 530 can be concentrated at the bottom of the fixing part 540 in a small area. , From this, the lower end of the fixing part 540 is fixed by stably contacting the fine irregularities of the surface of the scale C (see FIG. 5), or the lower end of the fixing part 540 is inserted into the scale C. It can be fixed.

In addition, a process of moving the contact member 522 and the core portion 530 together with the cast steel (S) in the casting direction is performed. The process of moving the contact member 522 and the core portion 530 together with the cast piece (S) in the casting direction is to move the contact member 522 and the core portion 530 between the roller that draws the cast piece (S) and the cast piece (S). It may include a process of entering and a process of pressing down the contact member 522 and the core portion 530 that enter between the roller and the cast steel (S).

That is, the motor 513 continues to operate in accordance with the speed at which the slab S moves in the casting direction to continuously rotate the storage roll 512, and the thermocouple wire 521 is continuously unwound from the storage roll 512. At the same time, by using the movement of the cast steel (S), the contact member 522 and the core portion 530 can be moved along the cast steel (S) in the same direction as the cast steel (S), and the cast steel (S) is drawn. The contact member 522 and the core portion 530 can be introduced between the upper roller 431, which is a roller, and the cast steel (S). In addition, using the thickness of the core portion 530, the contact member 522 and the core portion 530 that enter between the upper roller 431 and the cast steel (S) can be pressed down.

At this time, the process of entering the contact member 522 and the core portion 530 between the upper roller 431 and the cast steel (S) includes the process of contacting the roller 431 from the inclined surface 533b formed on the core portion 530. can do. That is, the inclined surface 533b formed in the core portion 530 is entered between the upper roller 431 and the cast steel (S), and then the plane (533a) connected to the inclined surface (533b) is connected to the upper roller 431 and the cast steel (S). It can be brought into contact with the roller 431 from the inclined surface 533b formed in the core portion 530 by entering the space.

In addition, the process of reducing the contact member 522 and the core portion 530 involves positioning the contact member 522 and the core portion 530 below the outermost surface of the cast steel (S), that is, the scale (C) surface. It can be included. For example, the contact member 522 and the core portion 530 are pressed down more than the thickness of the scale C formed on the cast steel S, and the contact member 522 and the core portion 530 are pushed into the scale C. ) can be brought into contact with the surface of the cast slab (S), and the surface of the cast slab (S) can be pressed by the contact member 522 and the core portion 530. Accordingly, the contact member 522 and the core portion 530 can be positioned below the scale C surface (see FIGS. 6 and 7).

Thereafter, the contact member 522 and the core portion 530 are continuously moved along with the cast steel S in the casting direction while the temperature of the surface of the cast steel S is measured using a condition measuring device 500. At this time, the temperature of the cast surface can be measured from the pressed contact member 522. Specifically, when the temperature of the contact member 522 rises due to the surface temperature of the cast steel, thermoelectric power may be generated in the wire of the thermocouple wire 521 connected to the contact member 522. At this time, the thermal electromotive force is measured by the data collector 523, the temperature of the contact member 522 can be obtained using the measured value, and the obtained temperature of the contact member 522 can be derived as the surface temperature of the cast steel. .

On the other hand, the casting method according to an embodiment of the present invention reduces the contact member 522 and the core portion 530 that enter between the roller, for example, the upper roller 431 and the cast slab (S), while forming a cast crack inside the cast slab (S). It may further include a process of generating (D) and a process of measuring the thickness of the solidified layer in the cast steel (S) using the generated crack (S).

A process of generating a cast crack (D) inside the cast steel (S) is performed. Using the pressure reduction of the contact member 522 and the core portion 530, the contact member 522 and the core portion (522) are formed on the surface of the cast steel (S). The area in contact with 530) can be pressed concavely in the shape of the contact member 522 and the core portion 530, and the solidified layer (S ₁ ) can be lowered toward the unsolidified layer (S ₂ ) by the amount of the concave area. . Accordingly, due to the descent of the solidified layer (S ₁ ), the shape of the boundary between the solidified layer (S ₁ ) and the unsolidified layer (S ₂ ) changes, so that the boundary between the solidified layer (S ₁ ) and the unsolidified layer (S ₂ ) Cracks may occur in

Afterwards, the thickness of the solidification layer in the cast steel (S) is measured using the generated crack (S).

That is, the cast steel (S) can be discharged from the path (L) through which the cast steel (S) is drawn, and the discharged cast steel (S) can be cut. At this time, the cast steel (S) may be cut in the width direction or length direction in the vicinity of the contact member 522 and the core portion 430. In addition, the cast steel (S) may be cut in the width direction or length direction at the positions of the contact member 522 and the core portion 430.

Afterwards, on the cut surface of the cut cast steel (S), the depth (T) of the crack (D) from the top of the cut surface is measured, and the measured depth (T) of the crack (D) is placed at the corresponding location, such as the solidification completion point (P). ) can be measured by the thickness of the solidified layer (S ₁ ) of the cast steel (S) at the upstream position. That is, the depth (T) of the crack (D) from the top of the cut surface of the cast steel (S) may be the thickness of the solidified layer (S ₁ ) at that point.

The above embodiments of the present invention are for illustrative purposes only and are not intended to limit the present invention. It should be noted that the configurations and methods disclosed in the above embodiments of the present invention may be combined or modified into various forms by combining or crossing each other, and the resulting modifications may also be considered within the scope of the present invention. In other words, the present invention will be implemented in a variety of different forms within the scope of the claims and equivalent technical ideas, and those skilled in the art to which the present invention pertains can implement various embodiments within the scope of the technical idea of the present invention. You will be able to understand.

100: tundish 200: mold
400: drawing machine 500: condition measuring machine
510: main body 520: measuring part
530: deep

Claims (26)

As a condition measuring device for measuring the casting condition of a cast steel,
A main body portion arranged to face the path where the cast steel is drawn;
A condition measuring device including a measuring unit installed in the main body so that it can be input into the path, and capable of measuring the temperature of the cast steel by contacting the cast steel. In claim 1,
A condition measuring device including a core portion supported by the measuring unit and seated on the cast steel to generate a crack inside the cast steel. In claim 2,
A condition measuring device including a fixing part formed on the bottom surface of the core so that it can be fixed to the surface of the cast steel using the weight of the core. In claim 2,
The main body is disposed on the upper side of the path and the length is adjustable,
The measuring unit is a condition measuring device including a first region that is wound and supported by the main body portion, and a second region that can be deployed from the main body portion and the core portion is supported at an end. In claim 4,
The second area is arranged to pass between two selected drawing machines among the drawing machines arranged along the path to draw the cast steel, and the height can be adjusted by winding and unwinding the first area. In claim 1,
The main body part,
body;
a storage roll rotatably disposed on the body, the first region of the measuring portion being wound and supported on an outer surface;
A condition measuring device comprising: a support arm extending from the body to cross the upper side of the path, the length of which is adjustable, and supporting the second region of the measuring unit. In claim 6,
The main body part,
a motor connected to the storage roll and configured to rotate the storage roll so that the measurement unit can be wound and stored or unwound and introduced;
A condition measuring device comprising a switching roll rotatably disposed at an end of the support arm and configured to change the direction of deployment of the measuring unit along an outer surface. The method of any one of claims 1 to 7,
The measuring unit,
thermocouple wire;
a contact member formed at an end of the thermocouple wire;
A condition measuring device comprising a data collector connected to the thermocouple wire and measuring the temperature of the cast steel. The method of any one of claims 2 to 5,
A condition measuring device in which a plurality of core parts are provided according to the thickness of the cast steel and can be replaced according to the thickness of the cast steel. In claim 9,
The measuring unit is provided in the same number as the number of core parts, and can be replaced together with the core part when the core part is replaced. The method of any one of claims 2 to 5,
The core portion has a bottom surface and an upper surface opposing each other and a side connecting the bottom surface and the upper surface, and a portion of the upper surface is formed to be inclined. In claim 11,
The inclined surface formed on a portion of the upper surface of the core portion is inclined so as to approach the bottom surface of the core portion as the distance from the end of the measuring portion increases. In claim 11,
A condition measuring device in which a through hole is formed in the core portion to penetrate the bottom surface and the upper surface. In claim 3,
A condition measuring device wherein the fixing part protrudes so that its width becomes narrower as it moves away from the bottom surface of the core. In claim 3 or claim 14,
A condition measuring device wherein a plurality of the fixing parts are provided and arranged along the circumference of the bottom surface of the core part. template;
A plurality of drawing machines arranged to form a path through which cast steel is drawn from the lower side of the mold;
A casting device comprising a; a state measuring device disposed between two drawing machines selected from among the plurality of drawing machines and capable of measuring the temperature of the cast steel by contacting the cast steel. In claim 16,
The condition meter is,
A measuring unit including a thermocouple wire to be seated on the surface of the cast steel, and a contact member formed at an end of the thermocouple wire to measure the temperature of the cast steel by contacting the cast steel;
A casting device including a core portion connected to the thermocouple wire and seated on the cast steel to generate a crack inside the cast steel. In claim 17,
A through hole is formed in the deep portion,
A casting device wherein the state measuring device includes a main body, and the measuring part is installed in the main body so that it can be deployed from the main body. The process of drawing a cast iron from a mold;
A process of advancing solidification from the surface of the cast steel to the inside;
A process of contacting a condition measuring device to the surface of the cast steel;
A casting method comprising: measuring the temperature of the surface of the cast steel using the condition measuring device. In claim 19,
The process of contacting the condition measuring device is,
A process of seating the contact member and core provided at the end of the condition measuring device on the cast plate;
A casting method including a process of moving the contact member and the core portion together with the cast steel in the casting direction. In claim 20,
The process of seating the contact member and core portion on the cast plate,
A casting method including a process of fixing the bottom surface of the core onto the cast steel. In claim 20,
The process of moving the contact member and core together with the cast steel in the casting direction,
A process of entering the contact member and the core between the roller for drawing the cast steel and the cast steel;
Including a process of pressing down the contact member and the core that enter between the roller and the cast steel,
The process of measuring the temperature of the surface of the cast steel with the condition measuring device,
A casting method comprising: measuring the temperature of the surface of the cast steel from the pressed contact member. In claim 22,
The process of reducing the contact member and core portion is,
A casting method comprising the step of positioning the contact member and the core portion below the outermost surface of the cast steel. In claim 23,
The process of entering the contact member and core between the roller for drawing the cast steel and the cast steel,
A casting method including a process of contacting the roller from an inclined surface formed in the core. In claim 22,
A process of generating a cast crack inside the cast slab while pressing down the contact member and the core that enter between the roller and the cast slab; and
A casting method further comprising: measuring the thickness of the solidified layer in the cast steel using the generated cracks. In claim 25,
The process of measuring the thickness of the solidified layer is,
A process of discharging the cast steel from the path where the cast steel is drawn;
A process of cutting the discharged cast steel;
A casting method comprising: measuring the depth of a crack on the cut surface of a cut cast piece.

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