JPS58103943A - Method and device for continuous casting - Google Patents

Abstract

PURPOSE:To cast ingots having good quality with good workability by receiving molten metal in a tundish, by connecting the tundish and a mold to one body by means of a connecting nozzle, and conducting the molten metal into the mold without being exposed to the molten metal to air and producing any surfacd of the molten metal in the mold. CONSTITUTION:A preheated tundish 1 is moved over a mold 6, and the connecting nozzle 3 of the tundish 1 and a separator 4 on the mold 6 are set and are connected to one body by a connecting mechanism 5. When the molten metal is streamed out by gravity from the tundish 1, a drawing and leveling device 9 starts drawing an ingot upon rising of the temp. of the cooling water when the molten steel is charged into the mold, cooperatively with the temp. detection for the mold cooling water. At the same time when the drawing of the ingot is started, the same oscillation of the tundish 1 and the mold 6 is started by a oscillation system 7 wherein both are made into one body, then the molten steel in the tundish 1 is conducted into the mold 6 without exposure to air and without forming any surface of the molten metal in the mold and is cast continuously through guiding rolls 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a continuous casting method for sea bream and its continuous casting method K11l.
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Quantity/continuous casting 41& is because, as shown in the proverb 1rIA, the Mendicier bond and the metallurgy are separated.

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1) Various non-oxidation casting methods have been used to prevent pinholes from forming during the formation of #I steel due to exposure to air at the point where molten steel flows down between the 17 date sheet and the mold section. It is being emitted. Examples include (Hata) the use of an immersion nozzle (2), and (b) the sealing of the periphery of the steel with an inert gas. When casting steel, for example, aluminium-containing steel, alumina precipitates inside the nozzle and causes nozzle clogging, which requires the selection of a special nozzle material and shape, making the operation complicated. In addition, if -) is adopted, additional equipment will be required and operation will be complicated.

In either case (Jl) or e) above, it is impossible to completely disconnect the outside air from the molten steel, and therefore, the formation of the above-mentioned inclusions etc. can be completely eliminated by the inflow of a small amount of air.
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-) 4) Fluctuations in the molten steel level in the mold cause scum to be drawn in and pinholes to occur, which adversely affects the quality of the pieces. For this reason, as a method to reduce the molten steel level O variation, a molten metal level gauge (
The molten steel level is detected and adjusted by the KFi controller, but it is difficult to maintain a constant molten steel level in the KFi mold, which is a complex device. In addition, M in figure 1
&17 trolls.

As mentioned above, in current continuous casting equipment, the tundish and the mold are separated, so various measures are taken to maintain the quality of the slab, but eventually .

The present invention solves the problems that occur between them by integrating the tundish and the mold.
Continuous casting equipment that produces high-quality slabs with good workability and its continuous casting equipment [%].

In addition, horizontal type continuous casting equipment exists as a continuous casting equipment that integrates a tanditshu and a screen, but this is different from the downward drawing method that is the subject of the present invention. However, according to the present invention, there is no modification required below the foot roll of the existing normal downward drawing type continuous casting equipment, and the construction between the tundish and the mold is made possible. This can be dealt with by simply modifying the upper m mechanism.

As an example of the continuous casting equipment according to the present invention, an overall explanatory diagram is shown in Fig. 12, and an example of the structure of the tundish mold joint is shown in Fig. IE3.
The dish nozzle (31 and mold 181) is set at the bottom of the dish dish (1).
Separator Ia) (il connection nozzle (
1) Anti-setting separator (hereinafter also referred to as separator) to prevent K molten steel from solidifying into non-INK
In a second, Tanditshu (1) and mold (.) are connected together. (&) is a hydraulic mechanism that connects the mold, C.) and the tundish (υ) through the connection nozzle (3), or a connection device using an alternative method.

(n is an oscillator/generator to photograph the mold ((turn)). (8) is a guide roll for the slab, and (.) is a pulling straightening device for the slab.
In -2, No.3-, an example was shown in which the thickness of the connecting part between the tundish and the mold was thinner than the inner thickness of the mold, but they may be the same thickness. Tanditshu that has completed preheating (
Move 1) onto the mold (・) and
After setting the connecting nozzle (1-) and the mold powder separator 141, which were previously installed on the It is integrated so as to be pressed more forcefully than K to prevent molten steel from leaking out of the system.

The injection of molten steel from the tundish (υ) into the mold (・) is set in advance on the tandish nozzle (!1), and is linked to the detection of the temperature of the cold cooling water, and withdrawal is started when the temperature of the cooling water rises due to the injection of molten steel. , - Simultaneously with the start of drawing of the piece, the shaking system that integrates the dish (1) and the mold (-) <nK, both machines start the same vibration, and the molten steel in the dish (1) is transferred to the mold (-). 11[ii] without exposure to 61K air and in the mold (・)
The steel billet is continuously cast through guide rolls (1) without causing any turbulence.

The present invention is constructed as described above, and has the following major features compared to conventional continuous casting methods and casting equipment.

■ Since there is no hot water level, ■ there is no need to control the hot water level in the mold. ■Mold lubrication (conventional Repseed or mold powder) is not required. (1) It becomes possible to produce steel with fewer scratches or scratches on the slab surface that are seen in conventional immersion casting and open casting.

■ Ta/dish nozzle ~ connection nozzle ~ seno (The molten steel passing through the lathe can be expected to be rectified, and there is little erosion of the refractory, making it possible to cast for a long time.

It is now possible to increase the distance between the separator and the separator, making it easier to continuously cast molten steel containing elements (aluminum, titanium, etc.) that conventionally could cause nozzle blockage.

(2) Conventionally, when casting the above-mentioned molten steel, complicated refractories for gas blowing, such as porous bricks, used to prevent nozzle clogging are unnecessary, and the work is simplified.

■ Since the space between the tanditshu and the mold is completely sealed, clean steel can be produced without contamination of molten steel by outside air or generation of inclusions.

Therefore, high-quality slabs can be manufactured with good workability, and products with large cross-sectional sizes such as blooms and slabs can also be manufactured.

[Brief explanation of the drawing]

Fig. 111 is an enlarged view of a conventional downward drawing type continuous casting equipment without showing an example of the structure of the joint between the dish and the mold. (υ...tanditshu, l)...connected nozzle, (6)
...Connection device, (7)...Vibration generator. Figure 1

Claims (1)

[Scope of Claims] l A method for receiving molten metal in a tundish, and then integrating the molten metal into the tundish through a connecting nozzle to create a lift in the tundish without exposing it to air. A continuous casting method that is characterized by the ability to mold without molding. 2 In continuous steel casting equipment KsP^, the tundish and mold are connected with an appropriate connection device via a connection nozzle provided at the bottom of the dish/dish. Continuous casting equipment characterized by integrating mold vibration equipment.