JPH04231152A - Casting device for introducing molten metal - Google Patents

Abstract

PURPOSE: To provide a structurally simple pouring device which is capable of executing pouring while shutting off air and does not occupy much space as the pouring device for introducing molten metal from a distributor into a continuous casting method having a nozzle opening arranged in the base of the distributor. CONSTITUTION: An immersion pipe (4) projecting to submerge under the liquid surface of the molten metal in the casting mold (10) is arranged under a nozzle (2) of the distributor (1). The axis (6) of the nozzle opening (3) of the distributor (1) exists in a eccentric position from the major axis (7) of the casting mold (10). The immersion pipe (4) is fixed at the distributor (1) rotatably around its major axis (5) and the major axis (5) of the immersion pipe (4) is arranged in alignment to the major axis (7) of the casting mold and is in contact with the nozzle (2). The end face (12) of the immersion pipe (4) is arranged in the position eccentric from the major axis (5) of (4).

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting device for introducing molten metal from a distributor into a continuous casting mold having a nozzle opening arranged in the bottom of the distributor.

0002

[Prior art] Conventional technology (German patent application publication No. 20
No. 43,588) discloses a casting device as mentioned at the outset, in which the nozzle opening of the container containing the molten metal can be closed via a rotary nozzle in the form of a rotary valve. For this purpose, in this known device, a stationary perforated plate is arranged at the nozzle opening of the container, which has a funnel-shaped through opening that widens towards the container. The end face of the perforated plate that does not face the container is chamfered. A rotary valve-shaped rotary nozzle plate having through-openings is in surface contact with this end face of the perforated plate. The peripheral area of this rotary valve-shaped rotary nozzle plate is held and guided by corresponding devices. By chamfering the end face of the perforated pedestal block, that is, the perforated plate, the rotation axis of the rotary valve type rotary nozzle can be arranged at an acute angle with respect to the casting axis. .

A disadvantage of this prior art is that it is expensive to achieve a sufficient sealing of the holding and rotating device which engages the peripheral area of the rotary valve type rotary nozzle plate. Another drawback that directly follows from this drawback is that the frequent replacement of the rotary valve-shaped rotary nozzle, which has to be carried out, is difficult due to the short downtime.

Another casting device is known from DE 27 44 443 A1. In this case as well, a rotary valve type rotary nozzle is used. In this case, the rotary valve-shaped rotary nozzle plate is arranged in a rotatable frame and has a plurality of through openings, in this case three. The through openings are each arranged offset by 120° with respect to the center point or point of rotation of the rotary valve-shaped rotary nozzle plate. Each time the frame is rotated together with the rotary valve rotary nozzle plate, one through opening can be rotated, for example, to a position below the nozzle opening of the distributor. In this case, the rotary valve type rotary nozzle plate is pressed against the nozzle block at the nozzle opening over a large area through the frame, and when the rotary valve type rotary nozzle plate is rotated, there is a gap between the rotary valve type rotary nozzle plate and the nozzle block. Sliding friction occurs. If a large number of through openings are provided on one common rotary rotary nozzle plate, the rotary valve rotary nozzle plate becomes correspondingly large. This results in relatively wide friction surfaces in this known device, which has the disadvantage that high forces are therefore required to rotate the rotary valve rotary nozzle. This high force requirement is further increased by the close proximity of the stationary dip tube to the end face of the rotary valve rotary nozzle facing away from the distributor. Moreover, the entire holding and rotating device is large and expensively equipped.

[0005]

OBJECTS OF THE INVENTION An object of the present invention is to start from the casting device described at the beginning, which is capable of performing casting while blocking air, is small in size and structurally simple, e.g. 9
The object of the present invention is to provide a casting device for small mold cross sections with billet dimensions of 0x90 mm.

[0006]

[Means for Solving the Problems] The above object is achieved by providing a casting device according to the preamble of claim 1, in which a part of the casting device protrudes below the nozzle of the distributor by submerging into the mold below the liquid level of the molten metal. the dip tube is arranged so that the axis of the nozzle opening of the distributor is eccentric to the longitudinal axis of the mold, and the dip tube is fixed to the distributor so as to be rotatable about its longitudinal axis. that the longitudinal axis of the dip tube is aligned with the longitudinal axis of the mold, and that the end face of the dip tube that is in contact with the nozzle is in contact with the end face of the dip tube as a wear member for the nozzle. This is achieved by the through-opening being arranged eccentrically with respect to the longitudinal axis of the dip tube and being designed such that the wear plane is located perpendicularly to the longitudinal axis, i.e. to the nozzle axis.

Accordingly, in the present invention, a rotary valve type rotary nozzle plate is incorporated into the dip tube, so that the through opening of the dip tube can be adjusted continuously from "fully closed" to "maximum open".
The dip tube has only one rotating valve-shaped rotating nozzle surface.

According to the present invention, by placing a dip tube directly below the nozzle of the distributor and projecting the dip tube into the mold until it is below the surface of the molten metal, casting can be carried out with almost no air allowed. It can be performed. By providing a through opening in the end face of the dip tube that connects to the nozzle, it is very advantageous that an additional rotary valve-shaped rotary nozzle plate is not required. Another advantage is that the dip tube with the features of the invention has only one friction surface, which results in significantly lower frictional forces and thus allows for a smaller drive device. According to the invention a nozzle shaft,
The compact arrangement of the dip tube axis, i.e. the rotation axis and the casting axis relative to one another, provides the advantage that the dip tube can have a very small diameter.

In the case of the prior art described at the beginning (German Patent Application No. 2043588), if the immersion tube is connected directly to the rotary valve type rotary nozzle, when the rotary valve type rotary nozzle is opened and closed, Shake at the immersion end of the dip tube. Therefore, casting with small mold dimensions cannot be performed.

In one advantageous embodiment of the invention, the dip tube has a larger internal diameter compared to the internal diameter of the nozzle opening;
The inlet side of the dip tube is closed except for the through opening. The through opening preferably corresponds to the inner diameter of the nozzle opening, but it can also be chosen larger or smaller. Such a structurally very simple dip tube is easy to manufacture and operate.

In one further advantageous embodiment of the invention, the inner diameter of the dip tube is equal to the inner diameter of the nozzle opening, and a diagonal channel extends between the dip tube and the nozzle opening, the axis of the channel being equal to the inner diameter of the nozzle opening. The axis of the opening intersects the rotational and longitudinal axes of the dip tube. The advantage of this embodiment is that the dip tube can be manufactured with a very small diameter at the end of the tube that is submerged in the molten metal in the mold. In another advantageous embodiment of such a dip tube, the outer region of the dip tube facing the nozzle widens towards the nozzle in a funnel-like manner, and this outer region has a collar, the collar Through which the dip tube can be supported and rotated. The advantage of such an embodiment is that the dip tube can be held and rotated in a very simple manner.

In the two embodiments of the present invention described above, since a rotary valve-type rotary nozzle is not required, the structure is simplified and friction is reduced. Reduced friction also reduces wear.

In principle, the casting device according to the invention can also be used in ladles with a nozzle opening arranged at the bottom, which is closed by a removable filling.

[0014]

EXAMPLES Next, the present invention will be explained in detail based on examples and with reference to the drawings. FIG. 1 shows the most important parts of one embodiment of a casting device. The dip tube 4 and the closing end face 12 of the dip tube 4 are manufactured from one piece. The axis of rotation 5 of the dip tube 4 is arranged in line with the axis 7 of the mold 10. With respect to this axis of rotation 5 or 7, the outlet opening 3 of the container 1 and the through opening 14 of the dip tube 4 are located eccentrically. Figure 1
The dip tube 4 for the outlet opening 3 of the container 1 is shown in
The position forms a closed state. To obtain the open condition, the dip tube 4 is rotated so that the through opening 14 is connected to the outlet opening 3 of the container 3.
It comes directly below.

FIG. 2 shows a second embodiment of the invention. In this case as well, the axis of rotation 5 of the dip tube 4 is arranged in line with the axis of the mold 10, so that both the outlet opening 3 of the container 1 and the inlet opening of the dip tube 4 at the end face 12 facing the container 1 are arranged in line with the axis of the mold 10. It is arranged at an eccentric position with respect to the rotating shaft 5. A lateral offset of the outlet opening 3 with respect to the axis of rotation 5 of the dip tube 4 can be compensated for by the oblique channel 8 . The outer region of the dip tube 4 widens towards the container 1 and the region of the dip tube 4 adjoining the container 1 has a collar 13 which is connected in a positive and forceful manner to the rotation and holding device 11. are combined. The entire dip tube 4 is likewise manufactured from one piece. FIG. 2 shows the casting device in an open state.

[0016] Due to the above-mentioned advantages, the casting apparatus of the present invention can be miniaturized, for example, 100 x 100 mm or 80 x 80 mm.
Used for casting small cross-sections of steel billets.

Furthermore, the superheating temperature that occurs when casting the steel is low, since the immersion tube combined with the rotary valve-type rotary nozzle has a very small contact surface with the molten steel, and therefore the temperature loss is low. It is from.

FIG. 3 shows a portion of the ladle within the area. In the metal ladle base 24 and in the refractory lining 25 of the ladle, a perforated pedestal block 26 is provided which accommodates the nozzle 21 . The nozzle opening of the nozzle 21 is closed off from the underside of the ladle by a combustible filling, preferably consisting of paper. The filling 22 in the nozzle opening is filled with granular material, for example sand. Filling 2 during filling of the ladle with molten metal and during transport or during secondary metallurgical measures such as desulphurization or vacuum treatment in the ladle.
2 is secured by a plate 27 which is fixed to the ladle bottom 24, for example by means of a wedge.

In the casting position, a nozzle tube 28, which is shown in principle in FIG. 4, corresponds to the dip tube 4 of FIGS. 1 and 2.
is fixed under the ladle. When the nozzle pipe 28 and the nozzle 21 cooperate, the lower surface 21' of the nozzle 21 is aligned with the longitudinal axis 2.
A rotary valve-shaped rotary nozzle is formed by the close contact with the end face 28' of the nozzle tube 28, which has a molten metal through-flow opening 30 located eccentrically relative to 9. The nozzle 21 and the nozzle tube 28 are precisely positioned and stretched relative to each other by suitable centering devices so that the two surfaces 21', 28' are in close contact with each other. The flange connection of the nozzle pipe 28 is between the nozzle opening of the nozzle 21 and the opening 3 of the nozzle pipe 28.
This must be done in such a way that the rotary valve type rotary nozzle is completely opened.

The combustion tube then introduces the oxygen-gas mixture into the nozzle tube 28, and the nozzle opening of the nozzle 21 is opened by combustion, so that the molten metal flows into the following vessel. The amount of molten metal flowing through the drive device 3
Adjustment can be made by rotating the nozzle tube 28 via 1.

[0021]

[Effects of the Invention] The following advantages can be obtained by the present invention. The molten metal in the ladle can be reliably filled, transported and processed without damage due to wear of the rotary valve rotary nozzle or damage due to mechanical breakage during transport, which normally occurs when processing times are long. Mechanical costs associated with wear of the rotary valve type rotary nozzle can be reduced. The amount of side air absorption can be reduced since there is only one sealing surface. Can improve steel quality. A trouble-free casting process can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a conceptual cross-sectional view of the main parts of a first embodiment of a casting device with a dip tube.

FIG. 2 is a conceptual cross-sectional view of a second embodiment of a casting device with a dip tube;

FIG. 3 is a cross-sectional view of a portion of a ladle with an outlet at the bottom.

4 is a conceptual cross-sectional view of the casting apparatus of FIGS. 1 and 2 modified so that the bottom of the ladle shown in FIG. 3 can be fixed; FIG.

[Explanation of symbols]

1 Container 2 Nozzle 3 Nozzle opening 4 Dip tube 5 Rotation axis 7 Rotation axis 10 Mold 11 Rotation and holding device 12 End face 13 Color 21 Nozzle 21′ Bottom surface of nozzle 22 Stuffing 23 Particulate matter 24 Bottom of ladle 25 Fireproof lining 26 Perforated pedestal block 27 Plate 28 Nozzle pipe 29 Longitudinal axis 30 Opening 31 Drive device

Claims (5)

[Claims] 1. A casting device for introducing molten metal from a distributor into a continuous casting mold, the nozzle (2) of the distributor (1) having a nozzle opening arranged at the bottom of the distributor. Below, a dip tube (4) is arranged which protrudes below the level of the molten metal in the mold (10), and the nozzle opening (3) of the distributor (1) shaft(
6) is in an eccentric position with respect to the longitudinal axis (7) of the mold (10) and the dip tube (4) is fixed to the distributor (1) rotatably about its longitudinal axis (5). the longitudinal axis (5) of the dip tube (4) is arranged in line with the mold longitudinal axis (7), and the end face (12) of the dip tube (4) in contact with the nozzle (2) However, as a wear element for the nozzle (2), a through opening located in the end face (12) of the dip tube (4) is arranged eccentrically with respect to the longitudinal axis (5) of the dip tube (4). Casting device for introducing molten metal, characterized in that the wear plane is formed in such a way that it lies perpendicular to the longitudinal or nozzle axis. 2. The dip tube (4) has an inner diameter larger than the inner diameter of the nozzle opening (3), and the inlet side of the dip tube (4) is closed except for the through opening (14), Through opening (
2. Casting device for introducing molten metal according to claim 1, characterized in that the inner diameter of the nozzle opening (3) corresponds to the inner diameter of the nozzle opening (3). [Claim 3] The inner diameter of the dip tube (4) is equal to the nozzle opening (3).
) is equal to the inner diameter of the dip tube (4) and the nozzle opening (
A diagonal channel (8) extends between the axis (9) of the channel (8) and the axis (6) of the nozzle opening (3) and the rotational and longitudinal axis (5) of the dip tube (4). 2. The casting device for introducing molten metal according to claim 1, wherein the casting device intersects the casting device. [Claim 4] A nozzle (2) in the dip tube (4).
The outer region facing towards the nozzle (2) widens in a funnel-like manner towards the nozzle (2), which outer region has a collar (13) through which the dip tube (4) can be supported and rotated. 4. Casting device for introducing molten metal according to claim 3, characterized in that the casting device is capable of introducing molten metal. 5. In a casting device for introducing molten metal into a distributor of a continuous casting device from a ladle for receiving and transporting molten metal from a metallurgical furnace to a casting place, for example, Claim 2 or Claim 3, wherein the arranged nozzle opening is filled with a material that prevents the entry of molten metal, and the nozzle opening is closed from the outside by removable mechanical means to form a casting device. Casting device for introducing molten metal, characterized in that the dip tube according to 1. can be installed at the casting site instead of by mechanical means.