JPH06595A - Continuous casting equipment - Google Patents

Abstract

(57) [Summary] [Object] The present invention is a continuous casting facility for varying the amount of cast steel due to uncertain factors at the start of a slab, preventing clogging of a casting nozzle, solidification, etc., and floating impurities in molten steel. To provide. The present invention relates to a continuous casting facility equipped with a tundish for storing molten steel, a steel injection nozzle provided under the tundish, and a mold section for cooling and solidifying the molten steel injected from the steel injection nozzle. , A gate control device that mechanically adjusts the opening of the pouring nozzle and controls the pouring amount, and is installed around the pouring nozzle to give rotational movement to the pouring steel from the pouring nozzle. And a rotating magnetic field generator. Therefore, the rotating magnetic field from the rotating magnetic field generator can give a rotating motion to the molten steel in the steel injection nozzle part, which promotes smooth steel injection in the steel injection nozzle part and operates by removing the floating impurities. It is possible to improve the rate and the product yield.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention optimally compensates for casting steel from the upstream at the start of casting and raises impurities in molten steel when continuously producing cast slabs from molten metal by continuous casting equipment. Regarding continuous casting equipment.

[0002]

2. Description of the Related Art A conventional continuous casting facility will be described with reference to FIG. As shown in FIG. 3, the continuous casting equipment has a tundish 2 which stores molten steel 1, a steel injection nozzle 3 provided under the tundish 2, and a nozzle opening adjustment for controlling and adjusting the steel injection amount. The gate 4 and the mold 5 part for cooling and solidifying the molten steel 1 poured from the tundish 2 through the steel injection nozzle 3 while vertically vibrating, and the cast piece 6 whose outer peripheral part is cooled and solidified by the mold 5 part. It is composed of a pinch roll group 7 for continuously withdrawing. 8 is a dummy bar.

In the thus constructed casting equipment, when casting is started to obtain the slab 6, the nozzle opening adjusting gate 4 provided at the lower part of the tundish 2 is opened to a certain specified value. The molten steel 1 is supplied to the mold 5 via the molten steel nozzle 3. The molten steel 1 supplied to the mold 5 is gradually solidified from the outside by removing heat from the water-cooled mold 5 part. With a certain solidified layer formed, the dummy bar 8 is pulled out by the pinch roll group 7 to continuously produce the slab 6. Also,
The casting is stopped by closing the nozzle opening adjustment gate 4 of the steel injection nozzle 3 provided in the lower part of the tundish 2 to stop the injection of the molten steel 1 into the mold 5.

[0004]

However, the above-mentioned conventional continuous casting equipment has the following problems. That is, at the start of casting, the relatively low temperature molten steel 1 located in the lower part of the tundish 2 is poured into the mold 5 through the molten steel nozzle 3, but the temperature drop of the steel casting nozzle 3 and the relatively low temperature. By injecting the molten steel 1 of No. 1, there was a problem that the molten steel 1 was often clogged in the steel injection nozzle 3, solidified, or the amount of the injecting steel was not constant, resulting in a large decrease in the operating rate. . Further, the impurities contained in the molten steel 1 in the tundish 2 are also injected into the mold 5 through the steel injection nozzle 3 in the current casting equipment, and surface defects of the product in the final product or There has been a problem that product defects due to segregation of impurities occur, leading to a decrease in yield.

The present invention has been made to solve the above problems, and its purpose is to prevent fluctuations in the amount of poured steel due to uncertain factors at the start of a slab, or to prevent clogging or solidification of a casting nozzle and molten steel. An object of the present invention is to provide a continuous casting facility capable of removing impurities inside.

[0006]

In order to achieve the above object, the present invention relates to a tundish for storing molten steel, a steel injection nozzle provided under the tundish, and a molten steel injected from the steel injection nozzle. In a continuous casting facility equipped with a mold part for cooling and solidifying, the gate control device that mechanically adjusts the opening of the steel injection nozzle to control the amount of steel injection, and the rotation of the injection steel from the steel injection nozzle. And a rotating magnetic field generator installed around the pouring nozzle to impart movement.

[0007]

According to the continuous casting equipment of the present invention, the rotary magnetic field from the rotary magnetic field generator imparts a rotary motion to the molten steel in the steel-pouring nozzle section, thereby promoting smooth steel-pouring at the steel-pouring nozzle section, and By floating the impurities and removing the impurities, it is possible to improve the operation rate and the product yield.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. As shown in the figure, in order to make a cast slab 6 from the steel injection nozzle 3 provided at the bottom of the tundish 2 storing the molten steel 1, a nozzle opening adjustment gate 4 is provided at the bottom of the tundish 2, and A rotating magnetic field generation device 9 is provided below the steel injection nozzle 3 so as to surround the steel injection nozzle 3.

The nozzle opening adjustment gate 4 is driven by an adjustment gate drive device 11 according to a command from the gate control device 10. The rotating magnetic field generator 9 is controlled by a power supply device 12 that variably controls the magnetic field current and frequency.

Next, the operation at the start of casting and in the steady casting state will be described with reference to FIGS. 1 and 2. The molten steel 1 stored in the tundish 2 is poured into the mold 5 by opening the nozzle opening adjustment gate 4 of the steel injection nozzle 3 provided at the bottom of the tundish 2 by the adjustment gate drive device 11. To be done. Further, the rotating magnetic field generator 9 installed so as to surround the steel injection nozzle 3 receives a current from the power supply device 12 at a magnetic field current and frequency which are defined in advance at the timing of opening the nozzle opening adjustment gate 4 described above. By being supplied, a rotating magnetic flux is generated around the steel injection nozzle 3. Then, the molten steel 1 passing through the steel injection nozzle 3 is given a rotational motion by this rotational magnetic flux. As shown in FIG. 2, the molten steel 1 to which the rotary motion is applied is poured into the mold 5 while remelting the solidification layer 13 which is a solidification progressing process on the wall surface of the steel injection nozzle 3 when passing through the steel injection nozzle 3. Therefore, it is possible to prevent clogging due to solidification in the steel injection nozzle 3 and to make the amount of steel injection constant. Further, since the impurities 14 contained in the molten steel 1 also float up by the rotating operation of the molten steel 1, it is possible to improve the product by removing the impurities 14.

[0011]

As described above, according to the present invention, at the time of starting the steel injection from the tundish to the mold and at the time of steel injection, the rotating magnetic field generator installed around the steel injection nozzle causes the steel injection nozzle. By giving a rotating operation to the molten steel inside, at the start of casting, the molten steel from the tundish is smoothly poured and the impurities in the molten steel at the time of casting are floated,
Since this can be removed, it is possible to improve the stability of operation and the yield of products.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of FIG.

FIG. 3 is a schematic configuration diagram of a conventional continuous casting facility.

[Explanation of symbols]

1 ... Molten steel, 2 ... Tundish, 3 ... Injection nozzle, 4 ...
Nozzle opening adjustment gate, 5 ... Mold, 6 ... Cast piece, 7 ...
Pinch roll group, 8 ... Dummy bar, 9 ... Rotating magnetic field generator, 10 ... Gate control device, 11 ... Control gate drive device, 12 ... Power supply device, 13 ... Coagulation layer, 14 ... Impurity.

Claims (1)

[Claims] 1. A continuous casting facility comprising a tundish for storing molten steel, a steel injection nozzle provided at a lower portion of the tundish, and a mold section for cooling and solidifying the molten steel injected from the steel injection nozzle, A gate control device that mechanically adjusts the opening degree of the steel injection nozzle and controls the amount of steel injection, and is installed around the steel injection nozzle to impart rotational movement to the injected steel from the steel injection nozzle. A continuous casting facility comprising a rotating magnetic field generator.