JP3021170B2 - Twin-drum continuous casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In a twin-drum continuous casting apparatus, a pool is formed by a pair of rotary cooling drums and a pair of side dams pressed against both end surfaces of the drum, and molten metal is supplied to the pool and cooled. This is a device that discharges a strip-shaped slab below the drum. Then, in order to prevent the solidified shell from sticking to the side weir, the side weir has been conventionally vibrated along the end face of the cooling drum.

FIG. 6 is an enlarged side view of a side weir pressing device of a conventional twin-drum continuous casting apparatus.
FIG. 7 is a sectional view taken along line VII-VII of FIG. 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 each other via a refractory material 53 on the surfaces. In the figure, the rod portions of three hydraulic cylinders 61 penetrate the frame 62 and are connected to the back of the side weir 52,
1 to press the pair of cooling drums 51.
A basin is formed between them. The continuous casting operation is performed by rotating the cooling drum 51 in the direction of the arrow in FIG. 4 while pressing the side weir 52 against both end faces of the cooling drum 51 with the hydraulic cylinder 61, and the refractory material of the pair of the cooling drum 51 and the side weir 52. 53
And the molten metal 72 is continuously supplied to the pool formed by
A strip-like cast piece 71 cooled and solidified by the cooling drum 51
Is discharged downward.

[0004]

In the above-described apparatus, the side dams 52 are pressed and held on both end surfaces of the cooling drum 51 by a constant pressing force of each hydraulic cylinder 61. However, the wear does not always occur in the same manner at each pressing portion of the refractory material 53, and when a difference occurs in the progress of the wear, the side weir 52 tilts and a gap occurs between the refractory material 53 and the end face of the cooling drum 51, Cast burrs due to hot water are generated on the slab 71. Therefore, in the present invention, the above-mentioned drawbacks are solved, the one-sided wear of the refractory material of the side weir is detected early and corrected, the inclination of the side weir is prevented, and the occurrence of casting burrs due to hot water is avoided. It is an object of the present invention to provide a twin-drum continuous casting apparatus capable of obtaining high quality cast slabs.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a pair of cooling drums rotating in opposite directions, a pair of side dams provided on both end surfaces of the drum, and a device for pressing the side dams. In the twin-drum continuous casting apparatus, the side weir pressing device comprises: a plurality of position control cylinders for pressing and holding the side weirs at a constant pressing force; a pressing reaction force detector attached to each position control cylinder; A comparison device that receives a signal from a device, compares the value of the signal with a prescribed value of the pressing reaction force corresponding to the value of the signal, and issues an activation signal when the value of the signal falls below the prescribed value. Alternatively, a signal from the detector is input, the values of the signals are summed, and the sum is compared with a specified value of the pressing reaction force, and when the sum is less than the specified value, an activation signal is output. The same amount of extrusion by the operation signal And a pointing device for simultaneously instructing each of the position control cylinders. In the twin-drum continuous casting device, and in the twin-drum continuous casting device, the specified value of the pressing reaction force is limited only within a certain period of time. A pressing reaction force specification value recording unit for inputting a pressing reaction force specification value pattern having a high value and then having a steady value is provided, and the total value of the signals from the pressing reaction force detector of the position control cylinder and the pressing reaction force The operation signal is generated when the total value is smaller than the specified value, and thereafter, the total value is compared with the value of the specified value pattern of the pressing reaction force with time. A comparing device for stopping the operation signal when the total value exceeds the value of the specified value pattern, and an indicating device for simultaneously instructing the respective position control cylinders with the same pushing amount by the operation signal. Have A twin drum type continuous casting apparatus according to claim.

[0006]

The twin-drum continuous casting apparatus according to the present invention rotates the pair of cooling drums while pressing and holding the pair of side dams at both ends of the cooling drum with a constant pressing force by a plurality of position control cylinders. The molten metal supplied is cooled and solidified on the surface of the cooling drum to form a strip-shaped slab, which is discharged downward. During the continuous casting, the pressing reaction force detector attached to the cylinder detects the pressing reaction force respectively. 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 dam is partially worn, the pressing reaction force decreases, so that the total value of the detection values of the pressing reaction force detectors also decreases. Therefore, the specified pressing force value previously input to the control device is compared with the total value, and when the total value is smaller than the specified value, each position control cylinder is operated so as to simultaneously extrude at the same preset amount of extrusion. In addition, the sliding surface with the end face of the cooling drum is uniformly worn over the entire surface to prevent the side weir from tilting and to prevent the gap between the cooling drum and the refractory material of the side weir.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 is an enlarged side view of a side weir 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 weir pressing device, and FIG. FIG. 5 is a control flow chart of the control device, showing a pattern of a reaction force prescribed value pattern. This device comprises three hydraulic position control cylinders 1a,
The side weir 52 is pressed by 1b and 1c, and a pool is formed by the cooling drum 51 and the refractory material 72 of the side weir 52. The center of the link 4 is pivotally supported by a pin 5 on the bracket 3 of the frame 2 fixed and opposed to the back of the side weir 52,
One end of the link 4 is connected to the cylinder 1a, 1b, 1c.
The ends of the rod portions of the cylinders 1a, 1b, 1c penetrate the frame 2 and are connected to the back surface of the side weir 52. Press reaction force detector (load cell) 9a, 9
One of the pressure receiving surfaces 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 are
Servo valves 12a, 12b, 1 by 11b, 11c
2c, and the valves are 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 pressing reaction force comparing section 13 and a pressing reaction force prescribed value storing section 1.
5, a cylinder operation instructing section 14 and a cylinder pushing amount storing section 16; First, while rotating the pair of cooling drums 51, hydraulic pressure is applied to the position control cylinders 1 a, 1 b, 1 c from hydraulic devices via the respective servo valves 12 a, 12 b, 12 c, so that the refractory material 5
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 pool formed by the cooling drum 51 and the refractory material 53 of the side dam 52,
The solidified strip slab 71 is discharged downward. And
During continuous casting, each pressing reaction force detector 9a, 9b, 9c
Detects the pressing reaction force acting on the position control cylinders 1a, 1b, 1c, transmits a detection signal to the pressing reaction force comparison unit 13 of the control device 10, and calculates the total sum. The specified pressure reaction force value is input to the specified pressure reaction force storage unit 15 of the control device 10, and the comparison unit 13 compares the sum of the detected values with the specified pressure reaction force value. It is assumed that the pressing portion of the refractory material 53 by the position control cylinder 1a on the left side in FIG.
When the sum of the detected values of b and 9c indicates a value lower than the steady-state value of the prescribed pressure reaction force, the comparison unit 13
And a signal is transmitted to the cylinder operation instructing section 14.
The cylinder pushing amount is stored in the cylinder pushing amount storage unit 16.
The cylinder operation instructing unit 14 which has received a signal from the pressing reaction force comparing unit 13 in advance, inputs the cylinder pushing amount stored in the cylinder pushing amount storing unit 16 into each servo valve 12a, 12b, 12c, the position control cylinders 1a, 1b, 1c are simultaneously operated with the same extrusion amount, and the refractory material of the pressing portions corresponding to the position control cylinders 1b, 1c is worn preferentially to reduce the pressing force of the pressing portions. Return to uniformity early. After that, return to the initial steady pressing force,
Casting is continuously performed while continuing the above detection.

FIG.
As shown in the figure, the pressing reaction force prescribed value pattern, that is, having a high value only during a certain time, after that, when inputting a pressing reaction force prescribed value pattern having a steady value, the pressing reaction force comparing unit 13 The pressure reaction force detector 9a of the position control cylinder,
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 less than the specified value, an operation signal is generated. The operation signal is stopped when the total value exceeds the value of the specified value pattern by comparing with the value of the specified value pattern with time. The same extrusion amount from the extrusion amount storage unit 16 is stored in each of the position control cylinders 1a, 1b,
It is also possible to control the pressing force of the side weir 52 by simultaneously instructing the servo valves 12a, 12b, 12c corresponding to 1c. When the operation signal stops, the initial steady pressing force is maintained. In this method, the polishing can be terminated by the pressing reaction force prescribed value pattern even during the polishing of the single wear of the refractory material, and the initial high region of the pressing reaction force prescribed value pattern is set to a steady state value. On the other hand, an arbitrary high value can be set, and the width of the area, that is, the holding time of the high area can be arbitrarily set. Therefore, there is an advantage that the refractory material 53 can be prevented from being excessively polished.

FIG. 5 summarizes the control of the side weir pressing by this method. First, a specified value of the pressing reaction force, and
The pushing amount of one side weir is input to the controller, the pressing reaction force detector detects the pressing reaction force of each hydraulic cylinder, and the sum is compared with the steady value of the pressing reaction force prescribed value pattern. When the steady value is not interrupted, the above detection is continued. However, when the steady value is interrupted, each hydraulic cylinder is instructed by a single push-out amount of the side weir to perform the polishing so as to eliminate the one-side polishing, and thereafter, the pressing reaction is performed. Detect the force and compare the sum with the value of the pressing reaction force prescribed value pattern over time, and when it exceeds the value of the prescribed value pattern, issue a stop signal to return the pressing force of each hydraulic cylinder to a steady state. If it occurs and does not exceed, the casting is continued while continuing the above detection.

[0011]

According to the present invention, by adopting the above-mentioned structure, one side wear of the refractory material of the side dam can be found at an early stage, and the refractory material causing the one side wear can be polished to obtain a uniform pressing force. As a result, it is possible to continuously obtain high quality cast slabs without casting burrs caused by hot water, avoiding the inclination of the side weir.

[Brief description of the drawings]

FIG. 1 is an enlarged side view of a side weir pressing device of a twin drum type continuous casting device according to one embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a block diagram of a control device of the side weir pressing device of FIG. 1;

FIG. 4 is a diagram showing a pressing reaction force prescribed value pattern according to one embodiment of the present invention.

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

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

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6;

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Terado Sada 4-6-22 Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Inventor Takashi Arai 3434 Shimada, Hikari-shi, Hikari-shi, Yamaguchi New Nippon Steel Corporation Hikari Works (72) Inventor Hideki Oka 3434 Omada, Hikari-shi, Yamaguchi Prefecture New Nippon Steel Corporation Hikari Works (72) Inventor Yasuhiro Yamagami Gikko 1 Yawata-ku, Kitakyushu-shi, Fukuoka Prefecture JP-A-3-230848 (JP, A) JP-A-63-177944 (JP, A) JP-A-62-10936 (JP) , A) JP-A-59-193741 (JP, A) JP-A-4-322849 (JP, A) JP-A-4-322284 (JP, A) JP-A-4-228243 (JP, A) 4-224052 (JP, A) Open Akira 63-36954 (JP, A) JitsuHiraku Akira 64-38141 (JP, U) (58 ) investigated the field (Int.Cl. ^7, DB name) B22D 11/06 330 B22D 11/16 104

Claims (3)

(57) [Claims] 1. A pair of cooling drums rotating in opposite directions,
In a twin-drum continuous casting apparatus including a pair of side weirs provided on both end surfaces of the drum and a device for pressing the side weir, the side weir pressing device presses and holds the side weir with a constant pressing force. A plurality of position control cylinders, a pressing reaction force detector attached to each position control cylinder, a signal from the detector being input, and defining the value of the signal and the pressing reaction force corresponding to the value of the signal. A comparison device that compares the value with the value and issues an activation signal when the value of the signal falls below the specified value;
An instructing device for simultaneously instructing the respective position control cylinders of the same extrusion amount by the operation signal. 2. A pair of cooling drums rotating in opposite directions,
In a twin-drum continuous casting apparatus including a pair of side weirs provided on both end surfaces of the drum and a device for pressing the side weir, the side weir pressing device presses and holds the side weir with a constant pressing force. A plurality of position control cylinders, a pressing reaction force detector attached to each position control cylinder, a signal from the detector is input, and the values of the signals are summed, and the sum and the pressing reaction force are defined. A comparison device that compares the values and outputs an operation signal when the total value falls below the specified value, and an indicating device that simultaneously indicates the same amount of extrusion to the respective position control cylinders by the operation signal. A twin-drum continuous casting apparatus, comprising: 3. A twin-drum continuous casting apparatus according to claim 1, wherein a specified value of the pressing reaction force is high only for a certain period of time, and thereafter, a pressing reaction force specified value pattern having a steady value is input. A pressing reaction force prescribed value recording unit is provided, and a total value of signals from the pressing reaction force detector of the position control cylinder is compared with a steady value of a prescribed value pattern of the pressing reaction force. An activation signal is generated when the value falls below the threshold, and thereafter, the total value is compared with the value of the prescribed value pattern of the pressing reaction force with time, and the activation signal is stopped when the total value exceeds the value of the prescribed value pattern. A twin-drum continuous casting apparatus, comprising: a comparison device for performing the operation and an indicating device for simultaneously instructing the respective position control cylinders of the same amount of extrusion by the operation signal.