JPS6368249A - Method and apparatus for controlling molten surface in shifting mold type continuous caster - Google Patents

Abstract

PURPOSE:To constantly maintain molten surface level by finding the molten metal surface level from temp. distribution in a mold space and controlling shifting velocity of block molds or flowing rate of the molten metal based on the deviation with the setting molten surface level. CONSTITUTION:The temp. in the mold space 7 is detected by the temp. detectors 10a-10g and the signal is sent to a molten surface arithmetic processor 11 and the temp. distribution in the mold space 7 is found and then the molten surface level 9 is found from the temp. distribution. The molten surface signal operated by the molten surface arithmetic processor 11 is sent to a comparator 12 and the deviation with the setting signal of molten surface is found by the comparator 12 and the deviation signal of molten surface is given to an adjusting device 14 for number of revolution of motor. Command signal is outputted in accordance with the deviation signal of molten surface from the adjusting device 14 for number of revolution of motor, and the number of revolution of motor 15 is controlled. In this way, the driving roll 4, that is, the shifting velocity of block molds 6 is controlled and the molten surface level 9 is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method and apparatus for controlling the melt level of a moving mold type continuous casting machine, which can maintain a constant surface.

[Prior Art] In general, a moving mold type continuous casting machine forms a mold by arranging a large number of block molds in an endless track shape, and combines the molds in two layers to create a mold space, and one side of the mold space is A tundish nozzle is inserted into the opening of the tundish nozzle, molten metal is supplied from the tundish nozzle, and the mold and solidified slab are moved toward the other open end to perform continuous casting. There are horizontal moving mold type continuous casting machines and tilting moving mold type continuous casting machines.

An inclined moving mold type continuous casting machine is shown, for example, in FIG. It is supplied to a mold space 7 formed between them, is cooled and solidified by a block mold 6, and is taken out of the machine as a slab 8. 9 in the figure is the hot water level.

[Problems to be Solved by the Invention] However, in the above conventional device, the tundish nozzle 3
If the melt level 9 fluctuates due to a change in the flow rate, etc., the shell generation surface may fluctuate and the shell may break out, and the shell pieces that break out may be newly formed into the block mold 6. Get between the generated shell and
Since it is taken out of the machine while still attached to the surface of the slab 8, there are problems such as unevenness on the surface of the slab 8 and deterioration of product quality.

In view of the above-mentioned circumstances, the present invention has been developed with upper and lower block molds 6.6.
This was done for the purpose of controlling the level of the molten metal supplied during the process to a constant level.

[Means for Solving the Problems] The present invention connects a large number of block molds and wraps them around rolls spaced apart from each other to form an endless track mold. In a moving mold type continuous casting machine that is arranged vertically to move in the same direction to form a mold space, supplies molten metal to the mold space, cools and solidifies the molten metal using a block mold, and casts slabs. Detecting the temperature in the mold space, determining the molten metal level in the mold space from the temperature distribution in the mold space, and controlling the moving speed of the block mold based on the deviation between the molten metal level and a set molten metal level. Alternatively, the flow rate of molten metal supplied to the mold space is controlled.

[Function] The molten metal level in the mold space is detected from the detected temperature distribution in the mold space, and if the scene differs from the set molten metal level, the rotation speed of the motor for driving the block mold or the molten metal flow rate is changed. The level of the molten metal in the mold space is controlled to be constant.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 show an embodiment of the present invention, in which thermal lightning pairs and heat pipes are placed at predetermined intervals along the mold space 7 from the vicinity of the tundish nozzle 3 insertion part of the block mold 6.6 toward the downstream side. Temperature detectors 10a, lOb, lOc, 10d, etc.
, lOe, lor, 100 are arranged so that the temperature in the mold space 7 can be detected, and the temperature signals detected by the temperature detectors 10a to IOg can be sent to the hot water level calculation device l], and the hot water level is The scene signal computed by the computing device 11 based on the temperature signal is sent from the scene computing device 11 to the comparator 12, and the comparator 12 receives the hot water level setting signal set by the setting device ]3 and the lu surface computing device 11. The scene deviation signal obtained by the comparison calculation can be sent to the motor rotation speed adjustment device 14, and the drive roll 4 is driven by a command signal from the motor rotation speed adjustment device 14. commands can be given to the motor 15 for use. 1 in the diagram
6. The first dollar, 17 is the ladle stopper, 18 is the arm attached to the upper edge of the first dollar so as to be able to swing up and down, 1.
Reference numeral 9 denotes a fluid pressure cylinder that opens and closes the cylinder stopper 17 via the arm 18.

By driving the motor 15, the block mold 6 is moved in the direction of the arrow via the drive roll 4. Also, by operating the fluid pressure cylinder 19, the dollar stopper 17
is opened, and the molten metal 2 is poured into the tundish sosh 1, supplied to the mold space 7 through the tundish nozzle 3, cooled and solidified, and taken out of the machine as a slab.

During casting, the temperature inside the mold space 7 is detected by the temperature detectors 10a to 10 (I), and the signal is sent to the hot water level calculation device 11.
The temperature distribution in the mold space 7 is determined, and the scene 9 is determined from the temperature distribution.

For example, if the temperature distribution determined by the hot water level calculating device 11 is as shown by the dotted line in FIG. 3, the hot water level 9 will be at the position of the temperature detector 10d. In this way, the position of the highest temperature in the temperature distribution determined based on the temperatures detected by the temperature detectors 10a to 10d is determined to be the hot water surface because there is a space above the hot water surface 9, so the thermal conductivity This is because the amount of heat transferred through the block mold 6 is low, and the amount of heat given to the block mold 6 gradually decreases below the hot water level 9 as the shell thickness h (see Figure 2) increases. .

For example, the hot water level 9 set by the setting device 13 is the position of the temperature detector 10b in FIG. 3, and the hot water level 9 calculated from the temperatures detected by the temperature detectors 10a to lOd is the position of the temperature detector 11M. In this case, the hot water level signal calculated by the scene calculating device 11 is sent to the comparator 12, and the comparator 12 calculates the deviation from the hot water level setting signal, 4L, and the scene deviation signal is given to the motor rotation speed adjusting device 14. Then, a command signal corresponding to the hot water level deviation signal is output from the motor rotation speed adjusting device 14, and the rotation speed of the motor 15 is decreased. Therefore, the moving speed of the driving roll 4 and the block mold 6 decreases, and the casting speed decreases, so that the molten metal level 9 rises. When the hot water level 9 becomes the same as the set hot water level, the output from the comparator 12 becomes zero, so the command signal is no longer output from the motor rotation speed adjustment device 14, and the rotation speed of the motor I5 remains unchanged. Constant speed operation is performed. If the detected hot water level 9 is higher than the set hot water level, the speed of the motor 15 is increased in accordance with the deviation.

FIG. 4 shows another embodiment of the present invention, in which a comparator 12 can give a hot water level deviation signal to a servo valve 20, so that the amount of fluid sent from a fluid pressure pump 21 to a fluid pressure cylinder 19 can be controlled. do. In the figure, the same reference numerals as those shown in FIG. 1 indicate the same parts.

The scene deviation signal from the comparator 12 is applied to the servo valve 20, and the fluid from the fluid pressure pump 21 is controlled by the servo valve 20, and the fluid at a predetermined port is introduced into the fluid pressure cylinder 19. Therefore, the opening degree of the ladle stopper 17 corresponds to the scene deviation signal, and the flow rate of the molten metal 2 flowing out from the ladle 16 and being supplied to the tundish 1 is controlled. As a result, the molten metal level in the tundish 1 fluctuates and the head pressure changes, so the flow rate of molten metal supplied from the tundish nozzle 3 to the mold space 7 changes, and the molten metal level 9 also rises and falls.

For example, if the hot water level 9 is lower than the set scene,
The opening degree of the ladle stopper 17 is controlled to be large, and when it is higher than the set scene, the opening degree of the ladle stopper 17 is controlled to be small.

Note that the present invention is not limited to the above-described embodiments, and that any number of temperature detectors may be provided, and that various changes may be made without departing from the gist of the present invention. Of course, etc.

[Effects of the Invention] According to the method and device for controlling the melt level in a moving mold type continuous casting machine of the present invention, the melt level in the mold space can be controlled at a constant level, so breakouts occur due to fluctuations in the shell or melt level. There is no risk of the casting pieces getting into the gap between the block mold and the shell, so the quality of the casting pieces is good.
Various excellent effects can be achieved.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an actual example of the scene control method and device for a moving mold type continuous casting machine of the present invention, Fig. 2 is a detailed view of the temperature detector portion of Fig. 1, and Fig. 3 is Temperature sensor number and fR
Fig. 4 is an explanatory diagram of another embodiment of the method and device for controlling the melt level of a moving mold type continuous casting machine of the present invention, and Fig. 5 is a general diagram of a moving mold type continuous casting machine. It is an explanatory diagram. In the figure, 1 is a tundish, 2 is a lubricant, 3 is a mold dish nozzle, 6 is a block mold, 7 is a mold space, 8 is a slab, 9 is a hot water surface, loa-10g is a temperature detector, 11 is a hot water 12 is a comparator, 13 is a setting device, 14 is a motor rotation speed adjustment device, 15 is a motor, 16 is a ratel,
17 is a dollar stopper, 19 is a fluid pressure cylinder, 20
21 represents a servo valve, and 21 represents a fluid pressure pump.

Claims (1)

[Claims] 1) A large number of block molds are connected and wound around rolls separated by a required interval to form an endless track mold, and the endless track mold is made such that opposing surfaces thereof move in the same direction. arranged above and below to form a mold space, supplying molten metal to the mold space,
In a moving mold continuous casting machine that cools and solidifies molten metal using a block mold to cast slabs, the temperature in the mold space is detected, and the surface of the molten metal in the mold space is determined from the temperature distribution in the mold space. , a moving mold continuous casting machine characterized in that the moving speed of the block mold is controlled based on the deviation between the molten metal level and a set molten metal level, or the flow rate of molten metal supplied to the mold space is controlled. Hot water level control method. 2) A large number of block molds are connected and wound around rolls separated by a required interval to form an endless track mold, and the endless track molds are arranged one above the other so that their opposing surfaces move in the same direction. forming a mold space and supplying molten metal to the mold space;
A moving mold continuous casting machine that cools and solidifies molten metal using a block mold to cast slabs, includes a plurality of temperature detectors arranged along the mold space to measure the temperature within the mold space; A hot water level calculation device that calculates the hot water level in the mold space based on the signal from the temperature detector, a comparator that calculates the deviation between the hot water level calculated by the hot water level calculation device and a set hot water level, and the comparison device. 1. A melt level control device for a moving mold type continuous casting machine, characterized in that a control device is provided for controlling the rotational speed of a motor for driving a block mold or the flow rate of molten metal based on a deviation signal from the casting machine.