JPH0333423B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention corrects the longitudinal thickness distribution and widthwise thickness distribution of the solidified layer pulled out from the roll gap in the form of a plate, and enables continuous casting to continuously cast plates for any crank. Regarding machines.

In recent years, various methods (twin roll method) have been proposed for continuously casting strip-shaped plates using a twin roll continuous casting machine. Continuous sheet casting by such a twin roll method is explained with reference to FIG. 1. Cooling rolls a and b whose inner surfaces can be water-cooled are arranged horizontally and in parallel, and a barrel seal c is placed on the cooling rolls a and b.
While continuously supplying molten steel d to a barrel formed by side seals (not shown), cooling rolls a and b are rotated by a required drive device, and the molten steel is cooled by the surfaces of cooling rolls a and b. The solidified layer e is formed into a plate and pulled out from between the cooling rolls a and b. In this way, strip-shaped plates f are continuously cast.

Currently, in the above-mentioned twin roll method, there is a problem in that the product has a thickness distribution in the longitudinal direction and a thickness distribution in the width direction, resulting in a decrease in quality.

In view of the above, the present invention enables the crown of the cooling roll to be changed arbitrarily to correct the thickness distribution in the longitudinal direction and the thickness in the width direction of the product, and to continuously cast a plate with a constant plate crown. This was done in order to provide a continuous casting machine.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows the present invention, in which a cooling water passage 1 is provided at both ends of a body part 2 spirally provided on the surface side, and the cooling water passage 1 becomes narrower as it approaches the center of the body part 2. Piston sliding spaces 3 and 4 are provided which are continuous in an annular manner along the inside of the piston sliding spaces 3 and 4.
Annular taper pistons 5 and 6 are slidably provided on the pistons. A piston hydraulic fluid oil passage 7 is communicated with the central end of the body of both piston sliding spaces 3, 4, and the central end is used as a hydraulic chamber 9, 11, respectively, and both piston sliding spaces 3, 4 An oil passage 8 for piston hydraulic oil is communicated with the end of the body of the piston to form hydraulic chambers 10 and 12, respectively, and both oil passages 7 and 8 are connected to a rotary joint 13 at the end of the roll shaft. Hydraulic piping 14,1
5, the roll shaft portion is rotatably supported by a bearing 16, and a drive shaft spindle 17 is connected to one end of the roll shaft. Hydraulic piping 14,1
5 communicates with a hydraulic power source 19 or an oil tank 20 via a control device 18, and the control device 18 switches the flow direction of hydraulic oil in the oil passages 7 and 8, and the taper pistons 5 and 6 are moved in opposite directions by the hydraulic pressure. The roll crown can be changed as appropriate by moving the roll crown in the direction of the roll crown and expanding or contracting the surface of the body part 2 by a wedge action. The relationship between the movement of the taper pistons 5 and 6 and the roll crown is, for example, when the taper pistons 5 and 6 move toward the end of the body, they take on the crown shape shown in Figure 3A, and when they move toward the center of the body, they take on the shape of the crown shown in Figure 3C. It becomes a crown shape as shown, and when it moves to the approximately intermediate position above, the third
It will have a flat shape as shown in Figure B.

In addition, a water channel 21 communicating with one end of the cooling water channel 1 and a water channel 22 communicating with the other end of the cooling water channel 1 are connected to water hoses 23 and 24 via a rotary joint 13, and cooling water is connected to one water hose 23. After passing through the cooling water flow path 1, the water is collected from the other water hose 24.

Two cooling rolls 25 configured as described above are arranged horizontally and in parallel, and both cooling rolls 25 are rotated while continuously supplying molten steel 27 into the barrel 26 provided on both cooling rolls 25. By pulling the solidified layer into a plate shape from between both cooling rolls 25,
In addition to having a structure in which the plate 28 is continuously cast, there is also a thickness gauge 29 that measures the thickness of the central part and both width ends of the plate 28 on the exit side of the cooling roll 25, and based on the signal from the thickness gauge 29. A comparator 30 calculates the plate crown of the plate 28, and the control device 1 compares the signal from the comparator 30 with the plate crown setting signal 31.
The computer 8 is equipped with an arithmetic unit 32 that sends necessary signals to the computer 8.

In the continuous casting machine configured as above,
The signal from the thickness meter 29 is sent to the comparator 30, where the widthwise plate thickness distribution and the longitudinal plate thickness distribution are calculated, and the signal from the comparator 30 and the setting signal 31 are compared by the arithmetic unit 32. By operating the control device 18 based on the signal from 32 and adjusting the positions of the taper pistons 5 and 6, casting is performed while changing the roll crown as necessary.
Therefore, the thickness distribution in the width direction and the thickness distribution in the longitudinal direction can be corrected, and the plate crown can be kept constant.

Note that the present invention is not limited to those shown in the above embodiments; for example, the piston sliding space may be made gradually wider toward the center of the body, and various other modifications may be made without departing from the gist of the present invention. Of course, it can be implemented with modifications.

According to the present invention, as described above, since the crown of the cooling roll can be changed arbitrarily, the thickness distribution in the longitudinal direction and the thickness distribution in the width direction of the product can be corrected, and it is possible to continuously cast a plate with a constant crown. It can have an excellent effect.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the state of casting by the twin roll method, Fig. 2 is an explanatory diagram showing an embodiment of the present invention, and Fig. 3 is an explanatory diagram showing the casting state by the twin roll method.
Figures A, B, and C are explanatory diagrams showing the roll crown of the cooling roll in the present invention. 1... Cooling water flow path, 2... Body, 3, 4... Piston sliding space, 5, 6... Taper piston,
7, 8... Oil passage for piston hydraulic oil, 9, 10, 1
1, 12... Hydraulic chamber, 18... Control device, 25...
...Cooling roll, 27... Molten steel, 28... Plate, 2
9... Thickness gauge, 31... Setting signal, 32... Arithmetic device.

Claims (1)

[Claims] 1. In a continuous casting machine in which molten steel is guided between two cooling rolls that rotate facing each other and drawn out in the form of a plate from the gap between the rolls, there is a width on both ends of the body of the cooling roll that is narrower or wider as it gets closer to the center of the body. A continuous annular piston sliding space is provided, and an annular tapered piston is slidably provided in each piston sliding space, and the body center side end and the body end side end of each piston sliding space are A control device that communicates a flow path for piston working fluid with the flow path, a control device that controls the direction of fluid flow in the flow path, a thickness gauge that measures the thickness of the exit side of the cooling roll, and signals and setting signals from the thickness gauge. A continuous casting machine characterized in that it is equipped with an arithmetic device that compares the values and sends a required signal to a control device.