KR102279907B1 - Cutting machine and cutting method for slab - Google Patents

Abstract

Disclosed are a cutting device and a slab cutting method using the same. According to an aspect of the present invention, in a cutting device for cutting a slab, the cutter is disposed on a transport path of a roller table for transporting the slab, and provided with a pair of burners movable in the width direction of the slab; A first conductor part that is in contact with the slab cut from the cutter on one side of the cutter and applies a current, and the other side of the cutter is in contact with the slab and receives a current provided from the first conductor part through the slab a sensing unit having a second conductor unit for sensing a flow; And a control unit for controlling the operation of the burner according to the connection and blocking results of the current flow through the sensing unit; cutting device comprising a can be provided.

Description

Cutting device and slab cutting method using the same {Cutting machine and cutting method for slab}

The present invention relates to a cutting device and a slab cutting method using the same, and more particularly, to a cutting device capable of detecting a cutting operation of a material such as a slab drawn in a continuous casting process, and a slab cutting method using the same.

In general, the continuous casting process involves injecting molten steel manufactured in an electric furnace or refining furnace into a ladle, then injecting the molten steel into a tundish, supplying the molten steel to the mold through the immersion nozzle of the tundish, and drawing out the slab. . The cast slab is cut to an appropriate length through a cutting device to meet the needs of the consumer. At this time, the slab may be first and second cut according to the required product, and a cutting device for cutting the slab in each round may be provided separately. For example, the primary cutting facility may be configured as a torch cutting machine (TCM), and the secondary cutting facility may be configured as a cross cutting machine (CCM). Here, the TCM is placed on the slab and the slab and the TCM move together as much as the casting speed to perform the cutting operation, and the CCM is made to perform the cutting operation while the slab is stopped.

All of these TCM and CCM cutting facilities are equipped with a pair of burners, and the pair of burners are arranged in a straight line on both sides of the slab in the width direction to move in the width direction of the slab to cut the slab. More specifically, when cutting the slab supported by the rollers of the roller table, a pair of burners cut the slab while moving in opposite directions. At this time, when a pair of burners approaches a certain distance during cutting, the sensor detects this, and one side of the burner moves to the initial position, and the remaining burner cuts the uncut part. Here, when the remaining burner cuts the uncut portion, the over-cutting is carried out and the cutting is completed by decelerating from the normal cutting speed and cutting beyond the cut point by the burner on one side.

In such a cutting operation, in the case of TCM, over-cutting is performed, and when the cutting operation is completed, the slab being cast continues to move, and the gap in the cutting loss that occurs during cutting, for example, a gap of 10 mm is filled. It comes into contact with the cut slab until it loses. At this time, the cut slab is stopped in a state that is not affected by the casting speed. That is, the slab under casting is brought into contact to transport the cut slab, but there is a problem in that the cut surface is dented because overcutting is made even when the slab under casting and the cut slab are in contact. In addition, there is a problem in that the surface quality of the slab is deteriorated, such as a step difference in the cut surface occurs due to a lot of cutting loss as the cutting speed is reduced during overcutting, and the real rate after rolling is also reduced.

On the other hand, in the case of CCM, the slab is cut while the slab is stopped, but if the flow of the slab or the alignment of the burner is not arranged in a straight line after the cutting is completed, dents will occur in the cut surface in the overcutting section, as well as the cutting speed during overcutting. There is a problem in that the cutting loss increases as the acceleration/deceleration increases, resulting in a step difference in the cutting surface.

Registered Patent No. 10-0820346 (POSCO Co., Ltd.) 2008.04.01.

The cutting device and the slab cutting method using the same according to an embodiment of the present invention detects the moment the cutting of the slab is completed and prevents the burner from being overcut, thereby preventing the deterioration of the surface quality of the slab.

According to an aspect of the present invention, in a cutting device for cutting a slab, the cutter is disposed on a transport path of a roller table for transporting the slab, and provided with a pair of burners movable in the width direction of the slab; A first conductor part that is in contact with the slab cut from the cutter on one side of the cutter and applies a current, and the other side of the cutter is in contact with the slab and receives a current provided from the first conductor part through the slab a sensing unit having a second conductor unit for sensing a flow; And a control unit for controlling the operation of the burner according to the connection and blocking results of the current flow through the sensing unit; cutting device comprising a can be provided.

In addition, one side and the other side of the cutter may be provided with fixing parts for fixing the first and second conductor parts, respectively, and the fixing part may be made of a non-conductive material.

In addition, the first and second conductor parts may be connected to the fixing part through a link member having a predetermined length to stably maintain a state in contact with the slab.

In addition, the roller table may be provided to be separated by being spaced apart in the transport direction of the slab based on the cut surface on which the slab is cut.

In addition, a grease pipe installed on the roller table and connected to a plurality of rollers for moving the slab is further provided, wherein the grease pipe is made of a non-conductive material or the roller table is made of a non-conductive material so that current does not flow between the separated roller tables. A grease pipe may be connected through a hose made of a non-conductive material at the separated point.

According to another aspect of the present invention, there is provided a method of cutting a slab being transported along a transport path of a roller table, (a) cutting the slab through a cutter having a pair of burners moving in the width direction of the slab step; (b) by applying a current to the first conductor portion provided to contact the slab to be cut from one side of the cutter, the second conductor portion provided to contact the slab from the other side of the cutter Detects the flow of current through the slab to do; And (c) controlling the operation of the burner according to the result that the flow of current through the second conductor is connected or blocked; a slab cutting method comprising a can be provided.

In addition, before the step (a), the roller table may be spaced apart in the transport direction of the slab based on the cut surface on which the slab is cut so that current does not flow through the roller table.

In addition, a grease pipe installed on the roller table and connected to a plurality of rollers for moving the slab is further provided, wherein the grease pipe is made of a non-conductive material or the roller table is made of a non-conductive material so that current does not flow between the separated roller tables. A grease pipe may be connected through a hose made of a non-conductive material at the separated point.

In addition, even if the height of the slab is higher or lower than a predetermined height, the first and second conductors through a link member having a predetermined length so that the first and second conductor parts are stably maintained in contact with the slab. A portion may be installed on the cutter.

In addition, the link member may be installed in a fixing portion made of a non-conductive material fixed to the cutter.

In addition, in step (c), the flow of current through the first conductor part and the second conductor part is sensed in real time, and when the flow of the current is cut off, the oxygen supply to the pair of burners is cut off. It can prevent the slab from being overcut.

In addition, when the cutting operation is stopped, it is possible to control the pair of burners to return to their original positions.

The cutting device and the slab cutting method using the same according to an embodiment of the present invention detect the cutting progress of the slab in real time by energizing the slab being cast and the slab being cut, and control the instant burner after the cutting is completed so as not to be overcut. It has the effect of preventing dents and step problems of the slab due to overcutting.

In addition, since overcutting can be fundamentally prevented, the cutting time can be shortened, and the supply amount of oxygen and gas for operating the burner can be reduced and the casting speed can be improved.

As a result, the surface quality of the slab is improved, so that it is possible to increase the real rate.

The present invention will be described in detail with reference to the drawings below, but these drawings show preferred embodiments of the present invention, and therefore the technical spirit of the present invention should not be construed as being limited only to the drawings.
1 is a view schematically showing a continuous casting facility according to an embodiment of the present invention.
Figure 2 is a perspective view showing a cutting device according to an embodiment of the present invention.
Figure 3 is a side view showing a cutting device according to an embodiment of the present invention.
4 to 6 are views each showing an operation state of cutting a slab using a cutting device according to an embodiment of the present invention.
7 is a flowchart for explaining a slab cutting method according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are presented in order to sufficiently convey the spirit of the present invention to those of ordinary skill in the art to which the present invention pertains. The present invention is not limited to the embodiments presented herein and may be embodied in other forms. The drawings may omit the illustration of parts irrelevant to the description in order to clarify the present invention, and may slightly exaggerate the size of the components to help understanding.

1 is a view schematically showing a continuous casting facility according to an embodiment of the present invention, Figure 2 is a perspective view showing a cutting device according to an embodiment of the present invention, Figure 3 is a cutting device according to an embodiment of the present invention It is a side view showing

1 to 3, the cutting device 100 according to an aspect of the present invention cuts the slab (S) drawn out provided in the continuous casting facility 1 to have the specifications required by the consumer. At this time, the continuous casting facility (1) is a ladle (2) containing molten steel in a liquid state, a tundish (3), a tundish (3) for receiving molten steel from the ladle (2) and temporarily storing it A mold (4) that receives molten steel from the molten steel and solidifies it to cast it into a slab, an immersion nozzle (5) that supplies the molten steel of the tundish (3) to the mold (4), and a cast slab drawn from the mold (4) A conveying roller 6 for conveying in one direction, a roller table 10 drawn on the conveying line to guide the slab (S) conveyed for the next process, and a cutting device for cutting the slab (S) provided in the conveying path ( 100) is included.

Here, the ladle (2), the tundish (3), the mold (4), the immersion nozzle (5), the conveying roller (6) and the roller table (10) are known techniques similar to general continuous casting equipment, so the description thereof is to be omitted.

However, according to the present invention, the roller table 10 may be provided to be separated along the direction of the transfer line through which the slab (S) is transferred. That is, the roller table 10 is provided with one side and the other side spaced apart at a predetermined position. This is to prevent electrical connection with other neighboring parts through the roller table 10 when a current to be described later is applied to the slab S, and this structure will be described again below.

In addition, the plurality of rollers 11 installed on the roller table 10 to move the slab S are connected to the grease pipe 12 for smooth rotation. The grease pipe 12 is provided along the longitudinal direction of the roller table 10 to be connected to each roller 11 . Accordingly, the grease pipe 11 is made of a non-conductive material, or, as shown in this embodiment, the grease pipe 12 is connected through the connecting hose 13 made of a non-conductive material at the point where the roller table 10 is separated. It may be provided to be connected. Accordingly, the equipment is provided in a state in which the electric current does not flow between the separated roller tables 10 .

The cutting device 100 according to one aspect of the present invention is disposed on the transport path of the roller table 10 and provided in the cutter 110 for cutting the slab (S), and the current through the slab (S) and a control unit 130 for controlling the operation of the cutter 110 according to the result of the connection and blocking of the current flow through the sensing unit 120 and the sensing unit 120 for detecting the flow of the.

The cutter 110 is provided with a pair of burners 111 and 112 movable in the width direction of the slab S. Here, the cutter 110 may be provided as a torch cutting device (TCM: Torch Cutting Machine) or a cross cutting device (CCM: Cross Cutting Machine). Such a cutter 110, as described in the technology that is the background of the above-mentioned invention, a pair of burners (111, 112) are disposed on both sides of the width direction of the slab (S) and move in the opposite direction to the slab (S) is configured to cut. The pair of burners 111 and 112 may be divided into a first burner 111 provided on one side of the slab S and a second burner 112 provided on the other side of the slab S, each burner A sensor (not shown) capable of detecting a distance is provided at 111 and 112, and when the first and second burners 111 and 112 are close to each other by a predetermined distance, the first burner 111 moves to the initial position and , the second burner 112 may be provided to cut the slab (S) of the uncut portion. These burners 111 and 112 are well-known techniques in which oxygen and gas are supplied and ignited, and a detailed description thereof will be omitted.

On the other hand, the cutter 110 may be set so that the cut surface of the slab (S) is located in a separated portion of the roller table (10) during the cutting operation of the slab (S).

A fixing portion 113 is provided on one side and the other side of the cutter 110, respectively. Here, one side and the other side mean the forward direction in which the slab (S) is transported based on the direction in which the slab (S) is transported, and the opposite side means the rear. That is, the fixing part 113 is provided on the front side and the rear side of the cutter 110 , respectively. The fixing part 113 is a portion where the first conductive part 121 and the second conductive part 122, which will be described later, are installed, and is made of a non-conductive material. A structure in which each of the conductors 121 and 122 is connected through the fixing unit 113 will be described again below.

The sensing unit 120 includes a first conductor part 121 provided on one side of the cutter 110 and in contact with the slab S, and a second conductor part 121 provided on the other side of the cutter 110 and contacting the slab S ( 122) and a measuring unit 125 for measuring the current flow between the first conductor unit 121 and the second conductor unit 122 .

The first conductor part 121 may be provided with a filler made of a conductive material through which a current can flow. Also, the first conductor part 121 may be provided to receive a current through the current lead wire 121a. Since the first conductor part 121 must maintain a state in contact with the slab S, it may be connected to the link member 123 to correspond to a thickness change of the drawn slab S. The link member 123 may have a predetermined length and may be connected to the first conductor part 121 on one side and the current lead wire 121a on the other side. For example, the link member 123 may be provided as a chain to transmit the flow of current. In addition, the link member 123 may be provided to have an extra length so that the first conductor part 121 is in contact with the slab S even if the thickness of the slab S is reduced.

Meanwhile, the first conductor part 121 may be installed in the fixing part 113 provided on the front side of the cutter 110 through the link member 123 . At this time, since the fixing part 113 is made of a non-conductive material, current does not flow to the cutter 110 through the fixing part 113 .

The second conductor part 122 may be provided with a filler made of a conductive material through which current can flow. The second conductor unit 122 serves to receive the current applied from the first conductor unit 121 through the slab (S). Accordingly, the second conductor unit 122 may be connected to the measurement unit 125 through the connecting wire 122a, and the measurement unit 125 may measure in real time whether or not the current flow is connected to the energized state. there will be Like the first conductor part 122 , the second conductor part 122 may be installed in the fixing part 113 provided on the rear side of the cutter 110 through a separate link member 123 .

On the other hand, the measuring unit 125 may have a transmitter (not shown) for transmitting the measured result to the controller 130 , and the transmitter is connected to the controller 130 wirelessly or by wire to transmit the measured result to the controller in real time. (130) will be provided.

As the first conductor part 121 and the second conductor part 122 are disposed on the front and rear sides of the cutter 110 , the cutting operation is performed between the first conductor part 121 and the second conductor part 122 . will be done Accordingly, when the cutting of the slab (S) is completed, the flow of current is blocked. Accordingly, the measurement unit 125 detects the flow of this current and transmits it to the control unit 130 so that the control unit 130 smoothly controls the operation of the cutter 110 .

On the other hand, the roller table 10 may be provided in a separated state so that the current does not flow so that the flow of current through the slab (S) is connected or blocked so that the state can be measured without malfunction. That is, as described above, as the roller table 10 is provided to be separated by a predetermined interval, it is possible to sense the flow of current only through the slab (S). In addition, the grease pipe 12 is made of a non-conductive material or the grease pipe is passed through the connecting hose 13 made of a non-conductive material at the point where the roller table 10 is separated so as to block current flowing through the grease pipe 12 as well. (12) may be provided to be connected. Accordingly, it will be apparent that the cutting operation proceeds between the roller tables 10 in which the flow of electric current is blocked.

The controller 130 controls the operation of the cutter 110 to control over-cutting. For example, when the flow of current is blocked, the controller 130 may stop the operation of the burners 111 and 112 provided in the cutter 110 . In particular, it is possible to prevent overcutting by blocking the flow of oxygen and gas supplied to the second burner 112 .

On the other hand, since the cutoff of the current means that the cutting operation is completed, the controller 130 moves the cutter 110 and a pair of burners 111 and 112 to the home position to wait to proceed with the next operation. can do it Accordingly, it is possible to increase the working efficiency.

Then, a method of cutting the slab using the cutting device 100 as described above will be described with reference to FIGS. 4 to 7 .

4 to 6 are each a view showing an operation state of cutting a slab using a cutting device according to an embodiment of the present invention, Figure 7 is a flowchart for explaining a slab cutting method according to another embodiment of the present invention am.

First, referring to FIGS. 4 and 7 , the slab S drawn from the mold (see '4' in FIG. 1 ) moves to the cutting device 100 along the conveying roller, and is cut through the cutting device 100 . The equipment is prepared and operated so that the work can be started (S110). At this time, the roller table 10 on which the cutter 110 is disposed is provided in a separated state by being spaced apart from each other by a predetermined period so that current does not flow. In addition, the grease pipe 12 is made of a non-conductive material or the point where the roller table 10 is separated so that current does not flow through the grease pipe 12 connected to each roller 11 installed on the roller table 10 . It may be provided so that the grease pipe 12 is connected through the connecting hose 13 made of a non-conductive material.

Next, when the slab (S) is transferred to the cutting position of the cutter 110, it is measured whether electricity is supplied through the sensing unit 120 (S120). That is, by applying a current through the first conductor unit 121 and receiving the current transmitted through the slab S, the second conductor unit 122 can measure the flow of the current. If, if electricity is not detected, since it means that the cutting device 100 of the present invention is malfunctioning, it is possible to stop the work and proceed with the repair work.

Then, as shown in Figures 5 and 7, when the flow connection of the current is measured, the cutting operation of the slab (S) is performed through the cutter 110 (S130). The cutting of the slab (S) can be cut through a pair of burners (111, 112). For example, the first burner 111 provided on one side in the width direction of the slab (S) and the second burner 112 provided on the other side in the width direction of the slab (S) move in the opposite direction to cut the slab (S) . At this time, each burner 111, 112 is provided with a sensor (not shown) capable of detecting a distance, and when the first and second burners 111 and 112 are close to each other by a predetermined distance, the first burner 111 is the first Moving to the position, the second burner 112 may be provided to cut the slab (S) of the uncut portion. At this time, since the slab S of the uncut portion through the second burner 112 is not cut, it is measured in a state in which current flows. Here, the cutting surface of the slab (S) is made at a position corresponding to the point where the roller table 10 is separated during the cutting operation.

6 and 7, when the second burner 112 cuts the uncut portion of the slab (S), a gap (G) is formed between the cut slab (S) and the drawn slab (S). Because of this, the flow of current is blocked. Accordingly, the measurement unit 125 measures that the current is cut off and transmits the measurement result to the control unit 130 ( S140 ).

The control unit 130 receives the measurement result in which the current is cut off from the measurement unit 125 and controls the operation of the cutter 110 to end the cutting operation (S150). That is, by blocking the supply of gas and oxygen provided to the second burner 112 , the operation of the second burner 112 is stopped to prevent overcutting. In addition, the second burner 112 and the cutter 110 are moved to the home position to switch to a standby state so that the next cutting operation can be performed. Therefore, it is possible to smoothly perform the cutting operation according to the continuous casting operation, it is possible to improve the quality and casting speed of the slab (S).

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following by those of ordinary skill in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

1: continuous casting equipment 10: roller table
12: grease pipe 13: connecting hose
100: cutting device 110: cutter
111: first burner 112: second burner
113: fixed part 120: sensing part
121: first conductor part 122: second conductor part
121a, 122a: electric wire 123: link member
125: measurement unit 130: control unit
S: Slab G: Gap

Claims (12)

In the cutting device for cutting the slab,
a cutter disposed on a transport path of the roller table for transporting the slab and provided with a pair of burners movable in the width direction of the slab;
A first conductor part that is in contact with the slab cut from the cutter on one side of the cutter and applies a current, and the other side of the cutter is in contact with the slab and receives a current provided from the first conductor part through the slab a sensing unit having a second conductor unit for sensing a flow;
a control unit for controlling the operation of the burner according to a result of connection and blocking of current flow through the sensing unit; and
A cutting device including a; grease pipe installed on the roller table and connected to a plurality of rollers for moving the slab. According to claim 1,
A cutting device provided with a fixing part for fixing the first and second conductor parts to one side and the other side of the cutter, respectively, and the fixing part is made of a non-conductive material. 3. The method of claim 2,
The first and second conductor parts are connected to the fixing part through a link member having a predetermined length to stably maintain a state in contact with the slab. According to claim 1,
The roller table is a cutting device that is provided to be separated by being spaced apart in the transport direction of the slab based on the cutting surface on which the slab is cut. 5. The method of claim 4,
A cutting device in which the grease pipe is made of a non-conductive material so that current does not flow between the separated roller tables, or the grease pipe is connected through a hose made of a non-conductive material at a point where the roller table is separated. A method of cutting a slab being transported along a transport path of a roller table, comprising:
and a grease pipe installed on the roller table and connected to a plurality of rollers for moving the slab,
(a) cutting the slab through a cutter having a pair of burners moving in the width direction of the slab;
(b) by applying a current to the first conductor portion provided to contact the slab to be cut from one side of the cutter, the second conductor portion provided to contact the slab from the other side of the cutter Detects the flow of current through the slab to do; and
(c) controlling the operation of the burner according to the result that the flow of current through the second conductor part is connected or blocked; 7. The method of claim 6,
Before the step (a), the roller table is spaced apart in the transport direction of the slab based on the cutting surface where the slab is cut, and the slab cutting method is provided so that no current flows through the roller table. 8. The method of claim 7,
The grease pipe is made of a non-conductive material so that current does not flow between the separated roller tables, or the grease pipe is provided to be connected through a hose made of a non-conductive material at a point where the roller table is separated. 7. The method of claim 6,
Even if the height of the slab is higher or lower than a preset height, the first and second conductor parts are connected to the first and second conductor parts through a link member having a predetermined length so that the state in contact with the slab is stably maintained. How to cut slabs to install on the cutter. 10. The method of claim 9,
The link member is a slab cutting method that is installed in a fixed portion of a non-conductive material fixed to the cutter. 7. The method of claim 6,
In step (c),
A slab that detects the flow of current through the first conductor part and the second conductor part in real time, and blocks the supply of oxygen provided to a pair of burners when the flow of the current is cut off to prevent the slab from being overcut cutting method. 12. The method of claim 11,
When the cutting operation of the slab is stopped through the cutter, the slab cutting method for controlling to return the pair of burners to their original positions.

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