JPH06106305A - Device for controlling thickness of cast strip in twin mold roll type continuous casting equipment - Google Patents

Abstract

PURPOSE:To produce a cast strip having uniform thickness in the width direction of the cast strip. CONSTITUTION:Mold shifting devices 3R, 3L at the right and the left sides are arranged so as to be possible to approach/separate a mobile side mold coil 1A to a fixed side mold roll 1B through mobile side mold bearings 2R, 2L. Further, a cast strip thickness detecting means 5 for detecting the thicknesses at both side parts in the width direction of the cast strip P by pressurized-contacting a mobile side measuring roll 4A in one pair of the measuring rolls 4A, 4B, which arrange while inserting the cast strip on the casting line and pressurized-contact with the cast strip over the width direction, by the prescribed pressure to detect this reaction force with load cells 10R, 10L interposed between the fixed side and the mobile side roll bearings 8R, 8L, 9R, 9L, and a cast strip thickness adjusting control device 6 for controlling driving of the mold shifting devices 3R, 3L, at the right and the left sides based on the detected value of the cast strip thickness detecting means 5 are arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slab thickness control device for controlling the thickness of thin plates in a continuous casting facility for continuously drawing thin plates from between mold rolls arranged in parallel with each other.

[0002]

2. Description of the Related Art Conventionally, in a twin mold roll type continuous casting facility, the distance between mold rolls has been adjusted in order to keep the slab thickness constant. For example, Japanese Patent Laid-Open No. 1-
In Japanese Patent No. 215442, one of a pair of mold rolls arranged in parallel to each other is used as a fixed roll, and
It is disclosed that the other is configured as a movable roll that can be moved toward and away from a fixed roll, and the thickness of the cast slab is controlled by adjusting the distance between these mold rolls.

[0003]

However, in the above-mentioned conventional example, based on the measured value obtained by measuring one point of the cast slab, the cylinder devices respectively connected to the bearings of the movable rolls are synchronously driven and the roll spacing is increased. The thickness of the slab is controlled due to overlapping conditions such as control position accuracy of the cylinder device, thermal deformation of the equipment frame, and non-uniform reaction force generated due to uneven slab shell formation. There is a problem that it cannot be dealt with when there is a bias in the width direction. When the slab plate thickness thus becomes uneven in the width direction, and one of the slabs becomes thicker than the other, when the slab is rolled, the greater the thickness, the greater the amount of extension, and the resulting rolled material. There was a problem of turning.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a slab thickness control device for a twin mold roll type thin plate continuous casting facility capable of manufacturing a thin plate having a uniform thickness in the slab width direction. And

[0005]

In order to solve the above problems, the cast piece thickness control device of the present invention comprises a pair of mold rolls arranged parallel to each other and at least one of which is movable toward and away from the other side. Left and right mold moving devices capable of adjusting the thickness of the slab by moving both ends of the movable mold roll toward and away from each other, and squeezing the slab on the casting line, and press-contacting at least both sides in the width direction. A slab thickness detecting means that can detect the thickness of slabs on both sides in the width direction by a pair of measuring rolls, and drive control of the left and right mold moving devices based on the detection value of the slab thickness detecting means. And a control device for adjusting the thickness of the cast slab.

[0006]

In the above structure, the thickness of the slab on both sides in the width direction of the slab is detected by using the measuring roll that sandwiches both sides of the slab on the casting line by the slab thickness detecting means. Based on the detection value, the left and right mold moving devices are driven by the adjustment control device to move the left and right ends of the movable mold toward and away from each other, thereby moving the left and right ends of the movable mold roll. The slab having a cross section inclined in the width direction can be manufactured by controlling the slab with a uniform thickness.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a cast piece thickness control apparatus for twin mold roll type thin plate continuous casting equipment according to the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the slab thickness control device of the first embodiment is arranged in parallel with each other in the left-right direction, and one movable mold roll 1A is fixed to the fixed mold roll 1B.
A pair of mold rolls 1A and 1B that can move closer to and away from each other
And movable mold bearings 2R and 2L supporting both ends of the movable mold roll 1A, respectively, to move the movable mold bearings 2R and 2L toward and away from each other, and right and left mold moving devices 3R and 3L, and a cast piece P on the casting line. Left and right slab thickness detecting means 5R and 5L capable of detecting the thickness of the slab P on both sides in the width direction by a pair of measuring rolls 4A and 4B arranged in the width direction and sandwiching the slab Thickness detecting means 5
Left and right mold moving device 3 based on the detected values of R and 5L
It is provided with a cast piece thickness adjustment control device 6 for driving and controlling R and 3L.

In the first embodiment shown in FIG. 1, the slab thickness detecting means 5R, 5L are provided with the measuring rolls 4A,
Of the 4B, the upper movable roll 4A for measurement is biased toward the lower fixed roll 4B for measurement, and the two measurement rolls 4A, 4A
Measuring roll pressure contact devices 7R and 7L for pressing B onto the front and back surfaces of the slab P at a predetermined pressure, movable side roll bearings 8R and 8L of the movable side measurement roll 4A, and fixed side rolls of the fixed side measurement roll 4B. Load cells 10R, 10L also serving as spacers, which are respectively interposed between the bearings 9R, 9L and detect reaction forces on the left and right sides of the measuring roll, the load cells 10R, 10L and the load detector 11R,
The roll reaction force detection device 12 is composed of 11L.

Next, details of the first embodiment will be described. Both ends of the movable mold roll 1A and the fixed mold roll 1B are rotatably supported by the movable mold bearings 2R and 2L and the fixed mold bearings 13R and 13L to form a basin 14, and the mold rolls 1A and 1B are The shaft on one end side is connected to the mold rotation drive device 1 via the interlocking device 15.
6, the mold rotation control device 25 drives the mold rolls 1A and 1B synchronously in a relative direction so as to pull out the slab P from between the mold rolls 1A and 1B, and the slab P from between the mold rolls 1A and 1B. Is configured to be continuously pulled out. The mold moving devices 3R and 3L are equipped with, for example, a hydraulic cylinder device and an operating electro-hydraulic servo valve, and are connected to a hydraulic unit (not shown) and driven. The movable mold bearings 2R and 2L have mold position detectors 17R and 17R for detecting the position of the movable mold roll 1A, respectively.
L is arranged respectively.

As shown in FIG. 2, the body lengths of the measuring rolls 4A and 4B are over the entire width of the cast slab P except for the side exposed portions P _S (this part is cut and removed in a later step). It is set to the pressure contact length. The measuring roll pressure contact devices 7R and 7L each include, for example, a hydraulic cylinder device and an operating electro-hydraulic servo valve, are connected to a hydraulic unit (not shown), and are connected to the measuring roll pressure control devices 18R and 18L. The movable side measuring roll 4A is configured to be pressed down with a predetermined pressure based on the signal.

In the slab thickness adjusting control device 6, the load cells 11R, 11L detect the load cells 10R, 10L.
The slab inclination correction calculation unit 20 input via L, the mold interval calculation unit 21 that calculates the mold interval based on the calculation value calculated by the slab inclination correction calculation unit 20, and the mold interval calculation unit 21. It is configured with mold position control units 22R and 22L that output control signals to the mold moving devices 3R and 3L based on the calculated command values.

Therefore, the measuring roll pressure welding device 7R,
When the movable side measuring roll 4A lowers the slab P with a predetermined pressure by 7L and the reaction force is detected by the load cells 10R and 10L, the detection signal is the load detectors 11R and 11L.
Is input to the slab inclination correction calculation unit 20 and the inclination of the movable-side measuring roll 4A, that is, the thickness inclination of the slab P is calculated. Then, based on the calculated value, the mold gap calculating unit 21 calculates the correction movement amount of the movable mold roll 1A, and the correction command signal is used as a mold position control unit 22R, 2
2L is input to the right and left mold moving devices 3R and 3L, respectively, and the movable mold roll 1A is moved toward and away from the movable mold bearings 2R and 2L, so that the gap between the mold rolls 1A and 1B, that is, the inclination of the thickness of the cast slab P. Is corrected.

Further, the cast piece thickness adjustment control device 6 includes
When the inclination of the thickness of the slab P is detected, the rolling force of the measuring roll pressure welding devices 7R and 7L on the thick side is increased to correct the inclination of the thickness. A cast slab total thickness control mechanism is provided to control the overall thickness.

That is, the slab inclination correction mechanism is configured such that the slab inclination correction calculation unit 20 operates the roll reduction control device 18 for measurement.
Rolling correction line 23 that outputs a correction signal to L and 18R
R and 23L are connected, and as shown in FIG. 3, the movable-side measuring roll 4A is pressed against the slab P by the predetermined pressing force F _R and F _L by the measuring roll pressing device 7R and 7L, and the left and right load cells are connected. Detection values _RR and _RL detected by 10R and 10L
However, when the detection value R _R on the right load cell 10R side> the detection value R _L on the left load cell 10L side, the thickness T _R of the right side portion of the cast slab P is smaller than the thickness T _{L of the} left side portion. Therefore, the slab P
The pressing force f of the left measurement roll pressure welding device 7L having a large thickness is increased to push in the left side of the movable side measurement roll 4A, and the movable side measurement roll 4A is used as a rolling roll. It can be rolled to have a uniform thickness.

The slab full thickness control mechanism extracts the detection signals from the load detectors 11A and 11B and compares the total load value of the left and right load cells 10A and 10B with a reference value.
An output load determination device 24 that determines whether or not the overall thickness of the slab P is appropriate is arranged. When the overall thickness of the slab P is large or small, the output load determination device 24 causes the mold rotation control device to operate. A rotational speed control signal of the mold is output to 25, and the rotational speed of the mold rolls 1A and 1B is reduced or increased to control the overall thickness of the cast slab P.

FIG. 4 shows a second embodiment of a cast piece thickness control apparatus for twin mold roll type thin plate continuous casting equipment. The same members as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. In the second embodiment, one of the measuring rolls 4A and 4B is urged by the slab thickness detecting means 5L and 5R to move the movable measuring roll 4A toward the other fixed measuring roll 4B. Roller 4A for movable side measurement by a fixed position pressure contact device 31 for press-contacting the movable side measuring roll 4A on the surface of the slab P at a fixed position, and the movable side measuring roll 4A by the fixed roll position pressuring device 31 for measuring the thickness of the slab P. The roll differential pressure detecting devices 32R and 32L for detecting the pressure contact forces on the left and right sides of the roller are provided.

That is, the roll fixed position pressure welding device 31 is
A constant hydraulic pressure is supplied from the hydraulic unit 33 via the left and right servo valves 34R and 34L, respectively, and urges the movable measuring roll 4A toward the fixed measuring roll 4B via the movable roll bearings 35R and 35L. Left and right hydraulic roll pressure contact cylinder devices 36R and 36L, and left and right roll position detectors 37R and 37L that detect the left and right side positions of the movable side measuring roll 4A, respectively, are provided. The hydraulic pressure is supplied to the roll pressure contact cylinder devices 36R and 36L via 34R and 34L, and the roll position detectors 37R and 37L detect the pressure contact positions on the left and right sides of the movable side measurement roll 4A, respectively, and the roll interval control device 37. To the servo amplifiers 38R, 38 based on the detected value.
It is configured to output to the servo valves 34R and 34L via L and control so that the left and right pressure contact positions of the movable side measurement roll 4A are constant.

Further, roll differential pressure detecting devices 32R, 32L
Is a hydraulic pressure supply pipe 39R, 3 connected from the servo valve 34R, 34L to the roll pressure contact cylinder device 36R, 36L.
The pressures of 9L and the hydraulic discharge pipes 40R, 40L are taken out via the cylinder internal pressure detectors 41R, 41L,
The differential pressure measuring devices 42R and 42L are configured to measure.

Further, the slab thickness adjustment control device 43 includes a slab inclination correction calculation unit 44 to which detection signals of the cylinder internal pressure detectors 41R and 41L are input via differential pressure detectors 42R and 42L, and a slab. A mold interval calculator 45 that calculates the interval between the molds 1A and 1B based on the calculated value calculated by the tilt correction calculator 44, and a mold moving device 3R based on the command value calculated by the mold interval calculator 45.
Mold position controller 46R for outputting a control signal to 3L,
It is composed of 46L. In addition, the differential pressure measuring device 42R,
A slab full thickness control mechanism for controlling the rotation speed of the mold rotation drive device 16 by the mold rotation control device 25 based on the signal of 42L is also provided.

Therefore, according to the above configuration, the movable pressure measuring roll 4A rolls down the cast slab P by the roll pressure welding cylinder devices 36R and 36L, and the roll constant pressure welding device 31 is used.
When the movable side measuring roll 4A is brought into pressure contact with the slab P at a constant position by means of the roll differential pressure detection devices 32R and 32L, the rolling force of the left and right roll pressure contact cylinder devices 36R and 36L is detected, and the detection signal is the slab. Thickness adjustment controller 4
3 is input to the slab inclination correction calculation unit 44, and the thickness inclination of the slab P is calculated. Then, based on the calculated value, the mold gap calculating unit 45 calculates the correction movement amount of the movable mold roll 1A, and the correction command signal is sent from the mold position control units 46R and 46L to the left and right mold moving devices 3R and 3R.
Is output to L, the movable mold roll 1A is moved toward and away from each other via the movable mold bearings 2R and 2L, the distance between the mold rolls 1A and 1B is corrected, and the inclination of the slab P thickness is corrected to be uniform. It is possible to manufacture the cast slab P having various thicknesses. Of course, by the cast slab thickness control mechanism,
The mold rotation control device 25 controls the rotation speed of the mold rotation drive device 16 based on the signals from the differential pressure measuring devices 42R and 42L.

[0022]

As described above, according to the present invention, the thickness on both sides in the width direction of the slab is detected by the measuring roll that sandwiches both sides of the slab on the casting line, and based on this detected value By driving the left and right mold moving device by the slab thickness adjustment control device, it is possible to move the both ends of the movable mold roll toward and away from each other, it is possible to correct the thickness of the slab in the width direction, A slab that is uniform in the width direction can be manufactured.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a cast piece thickness control device of a twin mold roll type thin plate continuous casting facility according to the present invention.

FIG. 2 is a front view showing a measuring roll of the slab thickness control apparatus.

FIG. 3 is a front view for explaining the operation of the measuring roll of the cast slab thickness control device.

FIG. 4 is a configuration diagram showing a second embodiment of a cast piece thickness control device.

[Explanation of symbols]

 1A, 1B Mold roll 3R, 3L Mold moving device 4A, 4B Measuring roll 5 Casting piece thickness detecting means 6 Casting piece thickness adjustment control device 7R, 7L Measuring roll pressure welding device 8R, 8L Movable roll bearing 9R, 9L Fixed side roll bearing 10R, 10L load cell 12 Roll reaction force detector 16 Mold rotation drive device 23R, 23L Rolling correction line 24 Output load judgment device 25 Mold rotation control device 31 Roll fixed position pressure welding device 32R, 32L Roll differential pressure detection device 43 Slab thickness adjustment control device

Claims (1)

[Claims] 1. A pair of mold rolls arranged in parallel with each other and at least one of which is movable toward and away from the other side, and both ends of the movable mold roll are moved toward and away from each other to adjust the thickness of the cast slab. A slab capable of detecting the thickness of slabs on both sides in the width direction by means of a possible left and right mold moving device and a pair of measuring rolls that press the slab on the casting line and are pressed against at least both sides in the width direction. Twin mold roll type thin plate continuous characterized by comprising a thickness detecting means and a cast thickness adjusting control device for driving and controlling the left and right mold moving devices based on the detection value of the cast thickness detecting means. Slab thickness control device for casting equipment.