JP2001087844A - Device for adjusting position of immersion nozzle for continuous casting and continuous casting method of metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for adjusting the position of an immersion nozzle to a mold, and a continuous casting method using this system. SOLUTION: The device for adjusting the position of the immersion nozzle for continuous casting is provided with one pair of rods 2 for detection, fitted to the upper extending direction of long side inner wall surfaces 1a of the mold 1, a tilting mechanism 6 for tilting a tundish 3, a horizontal shifting mechanism 7 for horizontally shifting the tundish 3, a camera 8 for picking up the rods 2 for detection and the immersion nozzle 4, an image processor 9 for processing the image picked up with the camera 8 and a control unit 10 for controlling the tilting mechanism 6 and the horizontal shifting mechanism 7 based on a signal from the image processor 9. The position of the immersion nozzle 2 is adjusted when needed during the time from the start of the casting to the halfway of the casting by using this system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for adjusting the position of an immersion nozzle for continuous casting, which adjusts the position of an immersion nozzle provided in a metal continuous casting machine with respect to a mold, and a method for continuously casting metal using this apparatus. About.

[0002]

2. Description of the Related Art A continuous casting machine for metal includes a tundish having a submerged nozzle at the bottom and a mold which is opened vertically. The tundish is mounted on a tundish car that moves horizontally between a casting position immediately above the mold and a retracted position.

[0003] During casting, the immersion nozzle is inserted into the mold from the upper opening of the mold by the horizontal movement of the tundish car and the descent of the tundish, and then the molten metal in the tundish is poured through the immersion nozzle. Injected into. The injected molten metal begins to solidify from the position in contact with the inner wall surface of the mold and after a solidified shell is formed, it is continuously pulled out from the lower opening of the mold, and the cast slab that has been solidified to the inside Become.

[0004] Since many of the slabs to be manufactured have a rectangular cross section, a rectangular mold whose inner cross section corresponds to the cross section of the slab is used. That is, the mold has a pair of facing inner wall surfaces having a length corresponding to the dimension of the long side of the slab (hereinafter, referred to as a long side inner wall surface),
A pair of facing inner wall surfaces having a length corresponding to the dimension of the short side of the slab (hereinafter referred to as a short side inner wall surface).

In order to stably produce a slab having a rectangular cross section, it is important to match the center of the mold with the center of the tip of the immersion nozzle. In particular, if the center of the inner wall surface on the short side does not match the center of the tip of the immersion nozzle, the flow of the molten metal from the immersion nozzle toward the long side inner wall surface injected into the mold is asymmetric with respect to the immersion nozzle. As a result, the shell may not be formed uniformly and breakout may occur.

A technique for adjusting the position of an immersion nozzle to a position suitable for a mold is disclosed in JP-A-61-144251. This technology detects the amount of movement of the immersion nozzle from a reference position when attaching the immersion nozzle to the bottom of the tundish, and moves the tundish to a preset position on the tundish car based on this detection data. Technology.

However, this technique is for replacing the immersion nozzle at a position where the tundish car is retracted from the upper part of the mold, and thereafter, when the tundish car is moved to a casting position, the tundish car is removed. Due to an error in the stop position, an error in the mounting position of the mold, and the like, the immersion nozzle does not always come to a position suitable for the mold.

[0008] In this technique, since the positioning is performed based on the amount of movement of the mounting position of the immersion nozzle to the tundish, when the immersion nozzle is mounted at an angle, the tip of the immersion nozzle is properly positioned with respect to the mold. Is not placed in an appropriate position.

Further, even if the position of the immersion nozzle changes during the casting operation due to, for example, thermal expansion of the tundish,
This position change cannot be handled.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to set the position of the tip of the immersion nozzle at the center of the mold and to correct the inclination of the immersion nozzle with respect to the mold in a state where the immersion nozzle is set at the casting position. It is an object of the present invention to provide an apparatus for adjusting the position of a continuous casting immersion nozzle and a method for continuously casting metal using the apparatus.

[0011]

The gist of the present invention is to provide the following (1) an apparatus for adjusting the position of a continuous casting immersion nozzle:
The method (2) is a continuous casting method for metal (see FIG. 1).

(1) A tundish 3 mounted on a tundish car 5 and provided with an immersion nozzle 4 at the bottom, a pair of long side inner wall surfaces 1a and a pair of short side inner wall surfaces 1 facing each other.
b) of a continuous casting machine for producing a slab by injecting the molten metal in the tundish 3 from the immersion nozzle 4 into the mold 1. A position adjusting device for a continuous casting immersion nozzle for adjusting the position of the immersion nozzle 4 with respect to a pair of long side inner wall surfaces 1 a constituting the mold 1, a pair of detection units mounted in the upward extension direction. Rod 2, a tilting mechanism 6 for tilting the tundish 3 in a direction along the short side inner wall surface 1b of the mold 1, and a horizontal movement of the tundish 3 in a direction along the short side inner wall surface 1b of the mold 3. A camera 8 for photographing the detection rod 2 and the immersion nozzle 4 facing each other from the direction of the short side inner wall surface 1b of the mold;
An image processing unit 9 for performing image processing on an image photographed in the step S1 to obtain an interval between the detection rod 2 and the immersion nozzle 4;
The tilting mechanism 6 and the horizontal moving mechanism 7 based on the signal regarding the distance between the detection rod 2 and the immersion nozzle 4 obtained in
And a control unit 10 for controlling the position of the continuous immersion nozzle for continuous casting.

(2) After the immersion nozzle 4 is set at the pouring position, the immersion nozzle 4 is positioned on the long side inner wall surface 1a of the mold 1 by using the position adjusting device for the continuous casting immersion nozzle described in (1). A continuous casting method wherein the inclination and the position are adjusted at least at any time between before the start of casting and during the casting.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus for adjusting the position of an immersion nozzle for continuous casting according to the present invention will be described with reference to FIGS.

FIG. 1 is a front view showing an example of a main part of a continuous casting machine provided with the position adjusting device of the present invention, and FIG.
It is an arrow view. In these figures, the mold 1 is required a pair of the long sides within a wall 1a facing length L _L corresponding to the dimension of the long side in cross section of the slab being, in cross-section of the slab A pair of short side inner wall surfaces 1b each having a length L _S corresponding to the dimension of the short side.

A pair of position detecting rods 2 are provided on the upper part of the mold 1. The position detecting rod 2 is attached in parallel with each of a pair of long side inner wall surfaces 1a constituting the mold 1 in a direction in which the long side inner wall surface 1a extends upward.

The tundish 3 has an immersion nozzle 4 at the bottom thereof and is mounted on a tundish car 5. The tundish car 5 has a mold 1 provided thereunder.
Reciprocates horizontally between the pouring position where the immersion nozzle 4 is located immediately above and the retracted position.

Tundish 3 and Tundish Car 5
And a tilting mechanism 6 and a horizontal moving mechanism 7.

The tilting mechanism 6 has two, for example, electric jacks 6a which are individually driven up and down. The electric jack 6a is provided at two positions in the direction in which the detection rods 2 are opposed to each other, that is, on both sides of the immersion nozzle 4 in the direction of arrow B. And tilted in the direction along the short side inner wall surface 1b. In addition, between the support part 6b which supports the bottom of the tundish 3 of the tilting mechanism 6 and the bottom of the tundish 3, it is possible to slide in the direction of arrow B.

The horizontal moving mechanism 7 composed of, for example, a hydraulic cylinder is provided on one side (the right side in FIG. 1) of the direction in which the detection rods 2 are opposed to each other, that is, in the direction of arrow B, and the short side of the mold 1. The tundish 3 is moved in the direction along the inner wall surface 1b, that is, in the direction of arrow B.

The camera 8 is attached to the tundish car 5 and photographs the two position detecting rods 2 and the immersion nozzle 4 from the direction of the short side inner wall surface 1b of the mold 1.

The image processor 9 sets the distance between the position detecting rod 2 and the immersion nozzle 4 as follows based on the image of the pair of the position detecting rod 2 and the immersion nozzle 4 taken by the camera 8. Ask.

FIG. 3 is a view showing an example of an image photographed by the camera 8 and sent to the image processing section 9. Image processing unit 9
Then, at a predetermined position of L1 from the upper end of the screen and a position of L2 from the lower end of the screen, one of the images 2g of the two position detecting rods 2 (right side in the figure) and the immersion nozzle 4 Are obtained at predetermined time intervals with respect to the image 4g.

At the position L1, the other (left side in the figure) image 2g of the image 2g of the position detecting rod 2 is shown.
An interval X3 between g and the image 4g of the immersion nozzle 4 is determined at predetermined time intervals. Intervals X1 and X determined by image processing unit 9
2. Signals relating to X3 are sent to the control unit 10.

The control unit 10 controls the tilting mechanism 6 and the horizontal moving mechanism 7 based on the signals regarding the intervals X1, X2, X3 sent from the image processing unit 9 as follows.

First, X1 and X2 are compared. As a result of the comparison, when X1 <X2 as shown in FIG.
The electric jack 6a on the right side of FIG.
The ascending drive signal is sent until it becomes 2. When X1> X2, the electric jack 6a on the left side of FIG.
Send the ascending drive signal until. The tilt of the tundish 4 is adjusted until the tilt of the immersion nozzle 4 is corrected by the rising drive signal.

After the inclination of the immersion nozzle 4 is corrected, X1
And X3. As a result of the comparison, if X1 <X3, a forward drive command is sent to the horizontal movement mechanism 7 until X1 = X3. If X1> X3, the horizontal moving mechanism 7
To X1 = X3. With this drive command, the position of the tundish 4 in the direction of the arrow B is adjusted until the immersion nozzle 4 is positioned at the center of the pair of detection rods 2.

The control unit 10 compares X1 with X2, sends a tilting drive command to the tilting mechanism 6 until X1 = X2, compares X1 with X3, and moves forward until X1 = X3. Although the drive command or the backward drive command is sent, the inclination allowable value and the displacement allowable value are set in advance, and X1
If the difference between X1 and X2 exceeds the slope tolerance, or X1 and X2
When the difference of 3 exceeds the set allowable displacement value, a drive command may be sent until the difference falls within the set allowable value.

When the outer diameter of the immersion nozzle 2 is tapered, the positioning may be performed in consideration of the difference in the outer diameter depending on the position of the immersion nozzle 2.

During continuous casting, the immersion nozzle 2 is moved by the horizontal movement of the tundish car 5 and the descent of the tundish 3.
Is inserted into the mold 1 from the upper opening of the mold 1, and then the molten metal in the tundish 3 is injected into the mold 1 through the immersion nozzle 2.

In the continuous casting method of the present invention, after the immersion nozzle 2 is inserted into the mold 1 and before the molten metal is injected into the mold 1, the position is detected while the molten metal is injected into the mold 1. The distance between the rod 2 and the immersion nozzle 4 is determined by the image processing unit 9 as, for example, X1, X2 and X3 shown in FIG. 3, and based on the result, the inclination and the position of the immersion nozzle 2 with respect to the inner wall surface on the long side are adjusted. .

In the above description, the tilting mechanism has a structure including, for example, two electric jacks that are individually driven up and down, but may be configured to tilt the tundish with one of them as a fulcrum. Further, the horizontal moving mechanism is provided on one side of the tundish, but may be provided on both sides of the tundish.

The metals to be subjected to the continuous casting of the present invention are steel, copper, aluminum and the like.

[0034]

According to the position adjusting apparatus for a continuous casting immersion nozzle of the present invention, the position of the immersion nozzle can be adjusted at any time from before the start of casting to during the casting with the immersion nozzle set at the casting position. It is possible to correct the inclination of the immersion nozzle with respect to the mold while adjusting to the center of the mold.

According to the continuous casting method of the present invention, from the start of casting to the end of casting, casting can be performed while maintaining the immersion nozzle at an appropriate position with respect to the mold.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a main part of a continuous casting machine provided with a position adjusting device of the present invention.

FIG. 2 is a view taken along the line AA of FIG. 1;

FIG. 3 is a diagram illustrating an example of an image.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold 2 Detection rod 3 Tundish 4 Immersion nozzle 5 Tundish car 6 Tilt mechanism 7 Horizontal movement mechanism 8 Camera 9 Image processing unit 10 Control unit

Continued on the front page (72) Inventor Kiyotaka Toyofuku 4-53, Kitahama, Chuo-ku, Osaka-shi, Osaka Sumitomo Metal Industries, Ltd. F-term (reference) 4E004 FB00 MD10 PA10

Claims (2)

[Claims] 1. A cross section of a tundish mounted on a tundish car and provided with an immersion nozzle at the bottom, and a pair of facing long side inner wall surfaces and a pair of short side inner wall surfaces facing each other. With a rectangular mold having a surface shape, a continuous casting machine for injecting the molten metal in the tundish from the immersion nozzle into the mold to produce a slab to adjust the position of the immersion nozzle with respect to the mold of a continuous casting immersion nozzle. A position adjusting device, comprising: a pair of detection rods attached in a direction in which each of a pair of long side inner wall surfaces constituting the mold is extended upward; and a tan in a direction along a short side inner wall surface of the mold. A tilting mechanism for tilting the dish, a horizontal moving mechanism for horizontally moving the tundish in a direction along the inner wall surface on the short side of the mold, a detection rod and an immersion nozzle disposed opposite to each other A camera that shoots from the direction of the short side inner wall surface of the mold, an image processing unit that performs image processing on an image captured by the camera to obtain an interval between the detection rod and the immersion nozzle, and a detection that is obtained by the image processing unit. A position adjusting device for an immersion nozzle for continuous casting, comprising: a control unit that controls the tilting mechanism and the horizontal movement mechanism based on a signal regarding a distance between a rod and an immersion nozzle. 2. After the immersion nozzle is set at the casting position, the inclination and position of the immersion nozzle with respect to the inner wall surface on the long side of the mold are cast by using the apparatus for adjusting the position of the immersion nozzle for continuous casting according to claim 1. A method for continuous casting of metal, wherein the adjustment is performed at least at any time during the casting from before the start.