JPH05269553A - Twin drum type continuous casting device - Google Patents

Abstract

PURPOSE:To provide a twin drum type continuous casting device which can obtain a cast strip having high quality, by detecting uneven wear of a refractory in a side weir at early time, correcting this wear, preventing the inclination of the side weir and avoiding the development of a casting burr caused by the insertion of molten metal. CONSTITUTION:In a pressing device for side weir to cooling drums, plural positional control cylinders for holding the side weir with the constant pressing force, a pressing reaction force detector attaching to each positional control cylinder, a comparator for comparing the signal value inputted from the detector with the regulating value of the pressing reaction force and transmitting a working signal when the total value is less than the regulating value and an indicating device for indicating the same pressing quantity to each positional control cylinder at the same time with the working signal are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twin-drum type continuous casting apparatus for pressing side dams against both end faces of a cooling drum.

[0002]

2. Description of the Related Art A twin-drum type continuous casting apparatus forms a molten metal pool with a pair of rotary cooling drums and a pair of side dams pressed against both end faces of the drum, and supplies molten metal to the molten metal pool for cooling. It is a device that discharges the strip-shaped slab below the drum. Then, in order to prevent the solidified shell from sticking to the side dam, it has been conventionally performed to vibrate the side dam along the end surface of the cooling drum.

FIG. 6 is an enlarged side view of a side dam pressing device portion of a conventional twin-drum type continuous casting apparatus.
FIG. 7 is a sectional view taken along line VII-VII of FIG. 6. In this device, side dams 52 are arranged on both end surfaces of a pair of cooling drums 51 so as to be in sliding contact with refractory materials 53 on the surfaces. In the figure, the rod portions of the three hydraulic cylinders 61 penetrate the frame 62 and are connected to the rear surface of the side weir 52.
The side weir 52 is pressed by the pair of cooling drums 51
Form a basin of water between. In the continuous casting operation, while the hydraulic dam 61 presses the side dam 52 against both end surfaces of the cooling drum 51, the cooling drum 51 is rotated in the direction of the arrow in FIG. 53
The molten metal 72 is continuously supplied to the pool portion formed by
A strip-shaped cast piece 71 that is cooled and solidified by the cooling drum 51.
Is discharged downward.

[0004]

In the above apparatus, the side dam 52 is pressed and held on both end surfaces of the cooling drum 51 by a constant pressing force of each hydraulic cylinder 61. However, the pressing portions of the refractory material 53 do not always wear in the same manner, and if a difference in the progress of wear occurs, the side dam 52 is inclined and a gap is created between the refractory material 53 and the end surface of the cooling drum 51. Cast burrs are generated on the cast slab 71 due to the boiling water. Therefore, in the present invention, the above drawbacks are eliminated, one-sided wear of the refractory material of the side weir is detected at an early stage and corrected, the inclination of the side weir is prevented, and the occurrence of casting burrs due to the soldering is avoided. The present invention aims to provide a twin-drum type continuous casting apparatus that enables to obtain high quality slabs.

[0005]

The present invention comprises a pair of cooling drums rotating in opposite directions, a pair of side dams provided on both end faces of the drums, and a device for pressing the side dams. In the twin-drum type continuous casting apparatus, the side dam pressing device comprises a plurality of position control cylinders for pressing and holding the side dam with a constant pressing force, a pressure reaction force detector attached to each position control cylinder, and the detection. Comparing device for inputting a signal from a device and comparing the value of the signal with a specified value of the pressing reaction force corresponding to the value of the signal, and issuing an actuation signal when the value of the signal falls below the specified value Alternatively, the signal from the detector is input, the values of the signals are summed, and the sum value is compared with a specified value of the pressure reaction force, and when the sum value is less than the specified value, an actuation signal is output. And a comparison device that emits In the twin-drum type continuous casting apparatus, and the above-mentioned twin-drum type continuous casting apparatus, the specified value of the pressing reaction force is set only within a certain time. It has a high value and then a steady-state pressure reaction force specified value pattern is provided with the pressure reaction force specified value recording section, and the total value of the signals from the pressure reaction force detector of the position control cylinder and the pressure reaction force Of the specified value pattern, the operation signal is generated when the total value falls below the specified value, and then the total value is compared with the value of the specified value pattern of the pressing reaction force over time. Then, a comparing device that stops the operation signal when the total value exceeds the value of the specified value pattern, and an indicating device that simultaneously indicates the same extrusion amount to the position control cylinders by the operation signal. Have A twin drum type continuous casting apparatus according to claim.

[0006]

In the twin-drum type continuous casting apparatus of the present invention, while the pair of side dams are pressed and held on both end faces of the cooling drum by a plurality of position control cylinders with a constant pressing force, the pair of cooling drums are rotated to move upward. The molten metal supplied from the cooling drum is cooled and solidified on the surface of the cooling drum to form strip-shaped slabs, which are discharged downward.While the continuous casting, the pressure reaction force detectors attached to the cylinders detect the pressure reaction forces. Then, the detection signal is transmitted to the control device to control the pressing of the position control cylinder. When the refractory material of the side weir wears on one side, the pressure reaction force decreases, so the total value of the detection values of the pressure reaction force detectors also decreases. Therefore, the pressing force specified value previously input to the control device is compared with the above total value, and when the total value is less than the specified value, the position control cylinders are operated so as to simultaneously extrude at the same preset extrusion amount. The sliding surface with the end surface of the cooling drum is evenly worn over the entire surface to prevent the side dam from tilting and to prevent the formation of a gap between the cooling drum and the refractory material of the side dam.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is an enlarged side view of a side dam pressing device of a twin-drum type continuous casting device, FIG. 2 is a front view of FIG. 1, FIG. 3 is a block diagram of a control device of the side dam pressing device, and FIG. FIG. 5 is a diagram showing a pattern of the reaction force stipulated value, and FIG. This device is provided with three hydraulic position control cylinders 1a,
The side dam 52 is pressed by 1b and 1c, and the cooling drum 51 and the refractory material 72 of the side dam 52 form a molten metal pool. The center of the link 4 is rotatably supported by the pin 5 on the bracket 3 of the frame 2 which is fixedly installed facing the back surface of the side dam 52.
Connect one end of the link 4 to the cylinders 1a, 1b, 1c
And the tips of the rods of the cylinders 1a, 1b, 1c penetrate the frame 2 and are connected to the rear surface of the side dam 52. Pressure reaction force detector (load cell) 9a, 9
One of the pressure receiving surfaces of b and 9c is fixed to the bracket 3, and the other pressure receiving surface is connected to the other end of the link 4.
The position control cylinders 1a, 1b, 1c include hydraulic pipes 11a,
Servo valves 12a, 12b, 1 by 11b, 11c
2c, and the valve is connected to the control device 10 and a hydraulic device (not shown).

As shown in the block diagram of FIG. 3, the control device 10 includes a pressure reaction force comparison unit 13 and a pressure reaction force prescribed value storage unit 1.
5, a cylinder operation instructing unit 14 and a cylinder push-out amount storage unit 16. First, while rotating the pair of cooling drums 51, hydraulic pressure is applied to the position control cylinders 1a, 1b, 1c from the hydraulic device via the respective servo valves 12a, 12b, 12c, so that the refractory material 5 of the side dam 52 is formed.
3 is pressed and held on both end surfaces of the cooling drum 51 with a constant pressing force. The molten metal 72 is continuously supplied to a molten metal pool portion formed by the cooling drum 51 and the refractory material 53 of the side dam 52,
The solidified strip-shaped slab 71 is discharged downward. And
During continuous casting, each pressure reaction force detector 9a, 9b, 9c
Detects the pressure reaction force acting on the position control cylinders 1a, 1b, 1c, transmits a detection signal to the pressure reaction force comparison unit 13 of the control device 10, and calculates the sum thereof. The pressing reaction force specified value storage unit 15 of the control device 10 inputs the pressing reaction force specified value, and the comparison unit 13 compares the sum of the detected values with the pressing reaction force specified value. If the pressing portion of the refractory material 53 by the position control cylinder 1a on the left side in FIG. 2 is abraded, the detection value of the pressing reaction force detector 9a decreases, and the other pressing reaction force detector 9
When the sum of the detected values of b and 9c is lower than the steady-state value of the pressing reaction force prescribed value, the comparing unit 13
Signal is generated and transmitted to the cylinder operation instructing unit 14.
The cylinder push-out amount storage unit 16 stores the cylinder push-out amount once.
The cylinder operation instructing unit 14 receives the signal from the pressure reaction force comparing unit 13 in advance, and the cylinder operation instructing unit 14 stores the cylinder pushing amount stored in the cylinder pushing amount storage unit 16 for each servo valve 12a, 12b ,. 12c, the position control cylinders 1a, 1b, 1c are simultaneously operated with the same extrusion amount to preferentially wear the refractory material of the pressing portions corresponding to the position control cylinders 1b, 1c to increase the pressing force of the pressing portions. Return to uniform early. After that, it returns to the initial steady pressing force,
Casting is continuously performed while continuing the above detection.

FIG. 4 shows the pressing reaction force prescribed value storage section 15 described above.
In the case of inputting a pressure reaction force specified value pattern, such as a pressure reaction force specified value pattern having a high value only within a certain period of time and having a steady value thereafter, in the pressure reaction force comparison unit 13, Position control cylinder pressing reaction force detector 9a,
The sum of the signals from 9b and 9c is compared with the steady value of the specified value pattern of the pressing reaction force, and when the sum is below the specified value, an actuation signal is generated, and thereafter the total value is applied to the pressing reaction force. Of the specified value pattern of the cylinder, the operation signal is stopped when the total value exceeds the value of the specified value pattern, and the cylinder operation instructing section 14 responds to the operation signal by the cylinder. The same push-out amount from the push-out amount storage unit 16 is applied to the respective position control cylinders 1a, 1b,
It is also possible to simultaneously instruct the servo valves 12a, 12b, 12c corresponding to 1c to control the pressing force of the side dam 52. When the operation signal stops, the initial steady pressing force is maintained. In this method, the polishing can be completed by the pressing reaction force specified value pattern even while polishing one-sided wear of the refractory material, and the initial high region of the pressing reaction force specified value pattern is set to the steady state value. On the other hand, an arbitrarily high value can be set, and the width of the region, that is, the holding time of the high region can be arbitrarily set, so that there is an advantage that the refractory material 53 can be prevented from being excessively polished.

The side weir pressing control by this method is summarized as shown in FIG. 5. First, the pressing reaction force prescribed value and
Input the pushing amount of the side weir once to the control device, detect the pressure reaction force of each hydraulic cylinder with the pressure reaction force detector, and compare the sum with the steady value of the above pressure reaction force specified value pattern. When the steady value is not interrupted, the above detection is continued, but when interrupted, each hydraulic cylinder is instructed the extrusion amount of the side weir once to perform polishing so as to eliminate one-sided polishing, and then press When the force is detected and the total sum is compared with the value of the pressing reaction force specified value pattern over time, and when the value of the specified value pattern is exceeded, a stop signal is sent to return the pressing force of each hydraulic cylinder to a steady state. If it occurs and does not exceed, casting is continued while continuing the above detection.

[0011]

According to the present invention, by adopting the above-mentioned constitution, one side wear of the refractory material of the side weir is found at an early stage, and the refractory material causing the one side wear is polished to obtain a uniform pressing force. Since it can be quickly returned to the above, it is possible to avoid the inclination of the side weir and continuously obtain a high quality slab without casting burrs due to the boiling water.

[Brief description of drawings]

FIG. 1 is an enlarged side view of a side dam pressing device of a twin-drum type continuous casting apparatus which is an embodiment of the present invention.

FIG. 2 is a front view of FIG.

3 is a block diagram of a control device for the side dam pressing device of FIG. 1. FIG.

FIG. 4 is a diagram showing a pressing reaction force prescribed value pattern which is an embodiment of the present invention.

FIG. 5 is a flow chart of side weir pressing control of the present invention.

FIG. 6 is an enlarged side view of a side dam pressing device of a conventional twin-drum type continuous casting device.

7 is a sectional view taken along line VII-VII of FIG.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Satoshi Terado, 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima City, Hiroshima Research Institute, Mitsubishi Heavy Industries, Ltd. (72) Takashi Arai, 3434 Shimada, Hikari City, Yamaguchi Prefecture Shin Nippon Steel Co., Ltd. Hikari Steel Co., Ltd. (72) Inventor Hideki Oka 3434 Shimada, Hikari City, Yamaguchi Pref. Nippon Steel Co., Ltd. Hikari Steel Co., Ltd. No. 1-1, Nippon Steel Corporation, Technology Development Division

Claims (3)

[Claims] 1. A pair of cooling drums rotating in opposite directions,
In a twin-drum type continuous casting apparatus equipped with a pair of side dams provided on both end surfaces of the drum and a device for pressing the side dam, the side dam pressing device holds the side dam with a constant pressing force. A plurality of position control cylinders, a pressure reaction force detector attached to each position control cylinder, a signal from the detector is input, and a value of the signal and a pressure reaction force corresponding to the value of the signal are defined. A comparator for comparing the value with a signal and issuing an activation signal when the value of the signal falls below the specified value;
A twin-drum type continuous casting apparatus comprising: an instruction device for simultaneously instructing the respective position control cylinders to output the same extrusion amount by the operation signal. 2. A pair of cooling drums rotating in opposite directions,
In a twin-drum type continuous casting apparatus equipped with a pair of side dams provided on both end surfaces of the drum and a device for pressing the side dam, the side dam pressing device holds the side dam with a constant pressing force. A plurality of position control cylinders, pressing reaction force detectors attached to the respective position control cylinders, signals from the detectors are input, the values of the signals are summed, and the total value and the pressing reaction force are defined. A comparing device for issuing an operation signal when the total value is smaller than the specified value and an indicating device for simultaneously instructing the respective position control cylinders with the same extrusion amount by the operation signal. A twin-drum type continuous casting device characterized by having. 3. The twin-drum type continuous casting apparatus according to claim 1, wherein a specified value of the pressing reaction force has a high value only within a certain time, and thereafter a pressing reaction force specified value pattern having a steady value is input. A pressing reaction force specified value recording unit is provided, and the total value of the signals from the pressing reaction force detector of the position control cylinder is compared with the steady value of the specified value pattern of the pressing reaction force. When it falls below, an actuation signal is generated, and then the above total value is compared with the value of the specified value pattern of the pressing reaction force over time, and when the sum value exceeds the value of the specified value pattern, the actuation signal is stopped. The twin-drum type continuous casting apparatus, characterized in that it has a comparison device and an instruction device that simultaneously indicates the same extrusion amount to the respective position control cylinders by the operation signal.