KR20150073760A - Segment for continuous casting with preventing surface defects and adjusting the roll gap function - Google Patents

Abstract

The present invention relates to a segment for continuous casting having a surface defect prevention and roll gap adjustment function capable of preventing the generation of cracks on an edge part of a strip and the distortion of the strip as the edge part of the strip is in contact with rolls to be overcooled by adjusting the contact area between the strip and the rolls. According to an embodiment of the present invention, the segment for continuous casting having a surface defect prevention and roll gap adjustment function comprises: an upper frame and a lower frame vertically separated from each other to enter a strip; and a plurality of upper guide rolls and lower guide rolls installed in the upper frame and the lower frame and separated to face each other such that the strip introduced into the separated space can be reduced. The upper guide rolls and the lower guide rolls are divided into a middle part and side parts formed in both ends. The middle part has a constant diameter and the side parts have a diameter gradually reduced toward the outer end.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a segment for continuous casting having a surface defect prevention and roll gap control function,

The present invention relates to a continuous casting segment, and more particularly, to a continuous casting segment, in which a contact area of a cast steel and a roll is adjusted so that the edge of the cast steel is in contact with the roll and is supercooled to cause cracks in the edge portion, Prevention and roll gap control of the continuous casting segment.

In general, a continuous casting process is a process of continuously solidifying liquid molten steel into a solid phase of a constant shape, and a plurality of nozzles provided in a segment are used to cool the cast during continuous casting operation.

FIG. 1 is a view showing a general continuous casting process, and FIG. 2 is a view showing a segment equipped with a nozzle used in a general continuous casting process.

Molten steel is injected into a tundish 40 through a long nozzle at a ladle 30 containing refined molten steel and molten steel temporarily stored in the tundish 40 is introduced into a tundish The molten steel is injected into the mold 50 through a DELIVERY SYSTEM positioned between the mold 50 and the mold 50 and is subjected to primary cooling in the mold 50, (S) such as BILLET, BLOOM, SLAB and the like in accordance with solidification of the cast steel (S).

The molten steel discharged through the mold 50 is subjected to primary cooling in the mold 50 so that the upper frame 100 and the lower mold 100 provided in a segment SEGMENT 1 of the continuous casting apparatus, The cooling water is continuously injected through the plurality of nozzles 11 for rapid solidification of the molten steel and continuously changed into a shape to be manufactured.

The rollers mounted on the segment 1 are generally composed of 5 to 10 rolls, and molten steel is cast and rolled therebetween to produce a slab.

However, even though the surface of the cast steel produced in the casting process is satisfactory, cracks are generated in the edge portion of the cast steel having a relatively low temperature, after rough rolling.

Conventionally, in order to prevent cracking of the edge of the casting edge, cracking of the edge portion is prevented by controlling the cooling water or controlling the temperature of the tundish. However, I could not solve it.

An apparatus for controlling the surface temperature of a cast steel by controlling the amount of cooling water injected from a conventional segment to prevent cracks and other defects from occurring in the cast steel is described in "An apparatus and a method for controlling cooling water temperature of a casting machine " ) "And the like.

However, it has not been solved that cracks are generated in the edge portion due to supercooling while the edges of relatively low temperature in contact with the segment roll come into contact with each other.

Patent Document No. 10-2013-0053093 (Feb.

The present invention provides a continuous casting segment having a surface defect prevention function and a roll gap control function capable of preventing an edge portion of a cast steel from being undercooled and reducing an edge crack generated during rough rolling.

In addition, a continuous casting segment having surface defect prevention and roll gap control function capable of adjusting the roll gap is provided.

According to an embodiment of the present invention, a continuous casting segment having a function of preventing surface defects and controlling a roll gap includes an upper frame and a lower frame spaced apart from each other so as to allow a main thread to be drawn in; And a plurality of upper guide rolls and a lower guide roll which are installed in the upper frame and the lower frame and are spaced apart from each other so as to oppose each other and press down the casted pieces into a spaced space, And the side portion is formed so as to have a reduced diameter as it goes toward the outer end portion.

Preferably, the continuous casting segment having the function of preventing surface defects and adjusting the roll gap according to an embodiment of the present invention is provided on the upper frame so as to adjust an interval between the upper guide roll and the lower guide roll, And a central cylinder extending in the direction of the center of the cylinder.

The apparatus further includes a plurality of side cylinders installed in the upper frame and the lower frame and extending in the direction of a side of each of the upper guide roll and the lower guide roll so as to adjust the amount of reduction of the edge of the casting.

A plurality of temperature sensors provided at the lower frame at predetermined intervals in the width direction of the cast steel in order to sense the widthwise surface temperature of the cast steel; And operating the respective side cylinders so as to reduce an area of contact between the upper guide roll and the lower guide roll and the main shaft when the widthwise surface temperature of the casting received from the temperature sensor is lower than a preset reference temperature And a control unit for transmitting a signal.

According to another aspect of the present invention, there is provided a continuous casting segment having a function of preventing surface defects and adjusting a roll gap, the upper and lower frames being vertically spaced apart from each other so that a main cutting edge can be drawn in; And a plurality of upper guide rolls and a lower guide roll which are installed in the upper frame and the lower frame and are spaced apart from each other so as to oppose each other and press down the casted pieces into a spaced space, Wherein the center roll is formed to have a constant diameter and the diameter of the side rolls is formed to be constantly decreased toward the outer end of the center roll, wherein the center roll is formed of a pair of side rolls disposed at both ends of the center roll, .

Preferably, the continuous casting segment having the function of preventing surface defects and adjusting the roll gap according to another embodiment of the present invention is provided on the upper frame so as to adjust an interval between the upper guide roll and the lower guide roll, And a central cylinder extending in the direction of the central roll constituting the roll.

The apparatus further includes a plurality of side cylinders installed in the upper frame and the lower frame and extending in each of the side roll directions so as to adjust a reduction amount of the edge of the casting.

A plurality of temperature sensors provided at the lower frame at predetermined intervals in the width direction of the cast steel in order to sense the widthwise surface temperature of the cast steel; And operating the respective side cylinders so as to reduce an area of contact between the upper guide roll and the lower guide roll and the main shaft when the widthwise surface temperature of the casting received from the temperature sensor is lower than a preset reference temperature And a control unit for transmitting a signal.

According to the embodiment of the present invention, the area of the edge of the cast steel having a relatively low temperature is reduced in contact with the upper guide roll and the lower guide roll, thereby preventing the edge of the cast steel from being subcooled, Can be improved.

Particularly, the temperature of the cast steel is detected in real time, and when the temperature is lower than the reference temperature, the contact area of the cast steel with the upper guide roll and the lower guide roll is automatically reduced to prevent the cast steel from being overcooled, thereby reducing the edge crack .

Further, it is possible to adjust the gap between the upper guide roll and the lower guide roll, thereby improving the quality of the produced cast steel.

FIG. 1 is a view showing a general continuous casting process,
Fig. 2 is a view showing a segment equipped with a nozzle used in a general continuous casting process,
3 is a cross-sectional view illustrating a continuous casting segment having a surface defect prevention and roll gap control function according to an embodiment of the present invention,
4 is a cross-sectional view illustrating a continuous casting segment having surface defect prevention and roll gap control function according to another embodiment of the present invention,
5 is a conceptual view showing a cross section of a cast steel which is pressed down by an upper guide roll and a lower guide roll according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments. For reference, the same numbers in this description refer to substantially the same elements and can be described with reference to the contents described in the other drawings under these rules, and the contents which are judged to be obvious to the person skilled in the art or repeated can be omitted.

FIG. 3 is a cross-sectional view illustrating a continuous casting segment having a surface defect prevention and roll gap control function according to an embodiment of the present invention. FIG. 5 is a cross- Fig. 6 is a conceptual view showing a section of the casting to be squeezed.

3 and 5, the continuous casting segment having the function of preventing surface defects and adjusting the roll gap according to an embodiment of the present invention includes an upper frame (not shown) A lower frame 200 and a plurality of upper guide rolls 300 installed on the upper frame 100 and a lower frame 200 so as to be spaced apart from the upper guide roll 300, And a plurality of lower guide rolls 400 mounted on the lower guide rollers 400.

The upper guide roll 300 and the lower guide roll 400 may have a central portion 310 and 410 having a constant diameter in the width direction of the slab S and a pair of guide rollers 310 and 410, The side portions 320 and 420 are formed to be divided into three portions.

By using a plurality of the upper guide rolls 300 and the lower guide rolls 400 disposed opposite to each other in the thickness direction of the cast steel S in the widthwise direction of the cast steel S, It is possible to minimize the contact area between the edge portion of the lower cast steel S and the upper guide roll 300 and the lower guide roll 400 to prevent the edge portion from being subcooled, thereby minimizing edge cracks There is an effect that can be.

The lower guide roll 400 may include a lower guide roll 300 and a lower guide roll 400. The lower guide roll 400 may include a lower guide roll 300, And further includes a cylinder 500.

The rod drawn out from the central cylinder 500 is rolled by pressing down the central portions 310 and 410 of the upper guide roll 300 to adjust the roll gap and to prevent the rotation of the upper guide roll 300, And a wheel (not shown) installed at an end of the rod so as to be rotatable in correspondence with the rotation of the upper guide roll 300.

The upper frame 100 and the lower frame 200 are provided with side portions of the upper guide roll 300 and the lower guide roll 400 so as to adjust the amount of reduction of the edge portion of the slab S, 320, and 420, respectively.

Each of the side cylinders 600 is individually operated and selectively stretched or shrunk to control the amount of reduction of the slab S, thereby improving the quality of the final product produced.

In the case where one edge of the cast steel S deviates from the normal track and is skewed, the side cylinder 600 is moved so as to increase the amount of reduction of the other edge of the cast steel S moving toward the center of the cast steel S By operating individually, it is possible to correct the meander of the slab S.

In this case, the continuous casting segment having the surface defect prevention and roll gap control function according to the embodiment of the present invention may further include a position detection sensor (not shown) capable of detecting the meander of the slab S have.

According to an embodiment of the present invention, a continuous casting segment having a function of preventing surface defects and adjusting a roll gap includes a plurality of temperature sensing sensors 700 spaced apart in the width direction of the slab S, And a control unit 800 for individually operating each of the central cylinder 500 and the side cylinder 600 in accordance with the widthwise surface temperature of the cast steel S received from the sensor 700. [

The plurality of temperature sensors 700 divide the slab S in the width direction at predetermined intervals and transmit the sensed temperature to the controller 800. At this time, if the widthwise surface temperature of the slab S received from each of the temperature sensors 700 is less than a predetermined reference temperature range, the controller 800 controls the surface of the slab S at the corresponding position, And transmits an operation signal to each of the central cylinder 500 and the side cylinder 600 so that the contact surfaces of the upper guide roll 300 and the lower guide roll 400 are reduced.

FIG. 4 is a cross-sectional view illustrating a continuous casting segment having a surface defect prevention and roll gap control function according to another embodiment of the present invention. FIG. 5 is a cross- Fig. 6 is a conceptual view showing a section of the casting to be squeezed.

4 to 5, the continuous casting segment having the function of preventing surface defects and adjusting the roll gap according to another embodiment of the present invention includes a vertically spaced upper frame A lower frame 200 and a plurality of upper guide rolls 301 installed on the upper frame 100 and a lower frame 200 so as to be spaced apart from the upper guide roll 301, And a plurality of lower guide rolls 400 mounted on the lower guide rollers 400.

Each of the upper guide rolls 301 and the lower guide rolls 400 has a center roll 311 and a pair of side rolls 321 and 421 disposed at both ends of the center rolls 311 and 411 And the center rolls 311 and 411 are formed to have a constant diameter in the width direction of the slab S and the pair of side rolls 321 and 421 are tapered to have a constant diameter decreasing toward the outer end, Surface is preferably formed.

This is because a plurality of the upper guide rolls 301 and the lower guide rolls 400 disposed opposite to each other in the thickness direction of the slab S are used to pressurize the slab S relatively in the width direction of the slab S The contact surface between the edge of the cast steel S and the side rolls 321 and 421 is minimized to reduce the edge crack that can be generated during rough rolling.

The center of the upper frame 100 in which the rod is drawn out in the direction of the upper guide roll 301 to adjust the distance between the upper guide roll 301 and the lower guide roll 401, And further includes a cylinder 500.

The rod drawn out of the central cylinder 500 presses down the center rolls 311 and 411 of the upper guide roll 301 to adjust the roll gap so as not to affect the rotation of the upper guide roll 301 And a wheel (not shown) installed at an end of the rod so as to be rotatable corresponding to the rotation of the upper guide roll.

The upper frame 100 and the lower frame 200 are provided with side rolls of the upper guide rolls 301 and the lower guide rolls 401 so as to control the amount of reduction of the edge of the slab S, 321, and 421, respectively.

Each of the side cylinders 600 is individually operated and selectively elongated or contracted to adjust the distance between the side rolls 321 and 421 of the upper guide roll 301 and the lower guide roll 401, S) can be adjusted.

In the case where one edge of the cast steel S deviates from the normal track and is skewed, the side cylinder 600 is moved so as to increase the amount of reduction of the other edge of the cast steel S moving toward the center of the cast steel S And the side rolls 321 and 421 of the upper guide roll 301 and the lower guide roll 401 press down the other edge portion of the cast steel S so that the meander of the cast steel S can be calibrated .

In this case, the continuous casting segment having the surface defect prevention and roll gap control function according to the embodiment of the present invention may further include a position detection sensor (not shown) capable of detecting the meander of the slab S .

A plurality of temperature sensing sensors 700 are installed at predetermined intervals in the width direction of the slab S and a plurality of temperature sensing sensors 700 are disposed at the center of each of the slabs S according to the widthwise surface temperature of the slab S received from the temperature sensing sensor 700. [ And a control unit 800 for operating the cylinder 500 and the side cylinder 600 separately.

The plurality of temperature sensors 700 divide the slab S in the width direction at predetermined intervals and transmit the sensed temperature to the controller 800. At this time, if the widthwise surface temperature of the slab S received from each of the temperature sensors 700 is less than a predetermined reference temperature range, the controller 800 controls the surface of the slab S at the corresponding position, And transmits an operation signal to each of the central cylinder 500 and the side cylinder 600 so that the contact area between the upper guide roll 301 and the lower guide roll 401 is reduced.

The operation of the continuous casting segment having the surface defect prevention and roll gap control function according to the embodiments of the present invention will be described with reference to the drawings.

The molten steel discharged through the mold 50 is subjected to primary cooling in the mold 50 to form a continuous casting segment having a surface defect prevention and roll gap control function according to the embodiment of the present invention, The temperature sensor 700 senses the surface temperature of the slab S in the width direction in real time and transmits the detected temperature to the controller 800. [

When the surface temperature in the width direction of the slab S received from the temperature sensor 700 is lower than a preset reference temperature, the controller 800 controls the upper guide rolls 300 and 301 and the lower guide rolls And transmits an operation signal to each of the central cylinder 500 and the side cylinder 600 so that the contact area between the workpiece 400, 401 and the cast steel S can be reduced.

When the slab S deviates from the normal trajectory, the control unit 800 transmits an operation signal to each of the side cylinders 600 to move the slab S toward the center of the slab S S) is increased to correct the meander of the slab (S).

The above process is continuously performed until the continuous casting process is completed.

Although the present invention has been described with reference to the preferred embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the following claims. It can be understood that

S: Casting 1: Segment
11: nozzle 30: ladle
40: tundish 50: mold
100: upper frame 200: lower frame
300, 301: upper guide roll 400, 401: lower guide roll
310, 410: central portion 311, 411: center roll
320, 420: side portions 321, 421: side rolls
500: Central cylinder 600: Side cylinder
700: Temperature sensor 800:

Claims (8)

An upper frame and a lower frame which are vertically spaced apart from each other so that the main body can be pulled in;
And a plurality of upper guide rolls and a lower guide roll which are installed in the upper frame and the lower frame and are spaced apart from each other so as to oppose each other,
Wherein each of the upper guide rolls and the lower guide rolls is divided into a center portion and a side portion formed at both ends, wherein the center portion has a constant diameter and the side portion is formed to have a reduced diameter toward the outer end portion. Continuous Cast Segment with Gap Control.
The method according to claim 1,
And a central cylinder disposed on the upper frame and extending toward the center of the upper guide roll so as to adjust an interval between the upper guide roll and the lower guide roll, Quiet Segment.

The method according to claim 1,
And a plurality of side cylinders provided on the upper frame and the lower frame and extending in a direction of a side of each of the upper guide roll and the lower guide roll so as to adjust a reduction amount of the edge portion of the casting edge, Continuous Cast Segment with Roll Gap Control.
The method of claim 3,
A plurality of temperature sensors disposed at a predetermined interval in the width direction of the cast steel in the lower frame so as to detect the widthwise surface temperature of the cast steel; And
And an operating signal is applied to each of the side cylinders so as to reduce an area of contact between the upper guide roll and the lower guide roll and the main shaft when the widthwise surface temperature of the casting received from the temperature sensor is lower than a preset reference temperature, And a control unit for controlling the rolls of the continuous casting segments.
An upper frame and a lower frame which are vertically spaced apart from each other so that the main body can be pulled in;
And a plurality of upper guide rolls and a lower guide roll which are installed in the upper frame and the lower frame and are spaced apart from each other so as to oppose each other,
Wherein each of the upper guide roll and the lower guide roll is constituted by a center roll and a pair of side rolls disposed at both ends of the center roll, the center roll is formed so as to have a constant diameter, and the side roll has a diameter Is formed so as to be constantly reduced. The segment for continuous casting with surface defect prevention and roll gap control function.
The method of claim 5,
And a central cylinder which is installed in the upper frame and extends in the direction of the center roll constituting the upper guide roll so as to adjust an interval between the upper guide roll and the lower guide roll, ≪ / RTI >
The method of claim 5,
And a plurality of side cylinders provided on the upper frame and the lower frame and extending in the respective side roll directions so as to adjust a reduction amount of the edges of the casting edges, Quiet Segment.
The method of claim 7,
A plurality of temperature sensors disposed at a predetermined interval in the width direction of the cast steel in the lower frame so as to detect the widthwise surface temperature of the cast steel; And
And an operating signal is applied to each of the side cylinders so as to reduce an area of contact between the upper guide roll and the lower guide roll and the main shaft when the widthwise surface temperature of the casting received from the temperature sensor is lower than a preset reference temperature, And a control unit for controlling the rolls of the continuous casting segments.

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