JPS6232682Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a belt-type continuous thin plate casting apparatus for continuously casting thin plates of metals and alloys.

[Conventional thin plate continuous casting equipment]

Figure 1 (top view) shows a conventional thin plate continuous casting machine.
As shown in FIG. 2 (center sectional view), the belt 1 is wound around pulleys 3 and 4, and
Tension is applied between them to form a flat surface. At least one of the pulleys 3 and 4 is connected to a drive device (not shown) so as to rotate in the directions 3a and 4a, respectively.

A hot water reservoir 5 is placed above the belt 1. The bath 5 has walls 5a, 5b, 5c on three sides, and the bottom is covered with a belt 1. The part of the belt 1 that forms the bottom plate of the bath 5 is installed so that it slopes uphill when viewed in the direction of movement, so the bath 5 forms a container with three walls and this bottom plate. There is. Between the both side walls 5b and 5c of the hot water tank 5,
A fixed mold 11 is placed. The mold surface 11a of the fixed mold 11 is parallel to the plane of the belt 1 constituting the bottom of the sump, and the gap between these two parallel planes becomes a mold space. A gutter 6 is placed above the rear wall 5a of the hot water tank. Its end portion is positioned slightly inside the rear wall 5a. belt 1
A support cooling device 2 for the belt 1 is installed below the bottom of the bath. The cooling water supplied here flows through 2a and 2b, and then is drained through a passageway in which the belt 1 is a part of the flow path wall through 2c and 2d. The fixed mold 11 has a recess 11c in its upper part. A slit 11b is provided from the bottom of the recess 11c to the mold surface 11a, and the two are in communication.

A heating means (not shown) is provided around the recess 11c and the slit 11b so that the temperature of the area can be maintained at a high temperature.

In the thin plate continuous casting apparatus having the above structure, the molten metal 7 transported by a ladle (not shown) flows into the sump 5 via the gutter 6. The molten metal 7c in the sump 5 receives heat from the water cooling belt 1 on the bottom and solidifies from the bottom. At this time, the bottom surface is moving in the direction of the arrow 8b, so the leading edge 8a of the solidified layer becomes as shown by the line, and the thickness of the solidified layer increases as it approaches the outlet of the slab.

When the thickness of the solidified layer increases and reaches the fixed mold surface 9a, the formation of the slab 8 is completed. The slab 8 is taken out by the movement of the belt 1, and at the same time, a roll device (not shown) pulls out the slab 8 directly in the direction of the arrow 8b.
is assisted by.

After the slab is formed, the slab 8 moves within the mold for a while, and during that time sliding occurs between the mold surface 11a of the fixed mold 11 and the upper surface of the slab 8. In order to reduce friction during this sliding, molten slag 12 is supplied to this interface. The molten slag 12 is temporarily stored in the recess 11c at the top of the fixed mold 11,
It flows into the interface through the slit 11b due to its own weight. Due to the lubricating action of the molten slag 12, excessive friction between the mold surface 11a of the fixed mold 11 and the upper surface of the slab 8 is prevented, and a high quality slab 8 without surface scratches can be obtained.

[Disadvantages of the above conventional device]

However, in the conventional apparatus described above, the force necessary for the flow of the molten slag depends on its own weight. As a result, it is difficult to adjust the supply amount, and especially when the molten slag supply opening (slit opening on the mold surface) is far below the free surface of the molten metal, the opening is blocked by the static pressure of the molten slag, making it almost impossible to supply the slag. It has its drawbacks.

[Purpose of this invention]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a belt-type continuous thin plate casting apparatus that eliminates the drawbacks of the conventional apparatus. That is, the purpose of the present invention is to (1) facilitate the adjustment of the supply amount when supplying molten slag as a lubricant to the interface between the mold surface of a fixed mold and the slab; Even if the molten slag outlet (at the molten slag outlet) is located below and away from the free surface of the molten metal, and a large molten metal static pressure is applied there, it overcomes the molten metal static pressure and reliably supplies a predetermined amount of molten slag. The purpose of the present invention is to provide a belt-type continuous thin plate casting apparatus that can perform continuous casting.

[Structure of the present invention]

The present invention provides a means for achieving the above object in that the molten slag container is provided with pressurized gas supply means. That is, the present invention provides a belt-type thin plate continuous casting apparatus that includes a belt-type moving mold and a fixed mold, and is configured to supply molten slag from a molten slag container to the interface between the fixed mold and the slab. , a belt-type continuous thin plate casting apparatus, characterized in that the molten slag container is provided with pressurized gas supply means.

In the present invention, the molten slag container is a sealed container, and is provided with means for supplying pressurized gas to the container. According to the present invention, when supplying molten slag to the interface between the fixed mold and the slab, pressurized gas is introduced into the molten slag container, and the pressure of the pressurized gas moves the molten slag from the container. It is extruded and supplied to the mold surface of a fixed mold. In addition, in the present invention, when operating for a long time, a method is adopted in which a plurality of molten slag containers are provided and the communication state between the containers and the mold surface is selectively switched using a valve. is preferable.

Hereinafter, the present invention will be explained in more detail by giving examples of the present invention.

[Embodiment 1] FIG. 3 shows a central sectional view of a belt-type thin plate continuous casting apparatus according to Embodiment 1 of the present invention.
In FIG. 3, the belt 101 is connected to the pulley 103,
104, and tension is applied between both pulleys so as to form a flat surface. Pulley 10
3 and 104 are connected to a drive device (not shown) so as to rotate in the directions of 103a and 104a, respectively. A fixed mold 102 is disposed opposite to the flat surface of the belt 101, and a mold space is defined between the two. Fixed mold 10
2 has a concave cross section, and the end surfaces of the protrusions on both sides are pressed against the flat surface of the belt 101.

A slit-like passage 11 is provided at the bottom of the fixed mold 102.
5, one end of which opens at the mold surface and the other end of which opens into the interior of the molten slag container 113. The molten slag container 113 is provided with a pressurized hole 114, which communicates with an external pressurized gas container.

An opening 105 is formed above the mold,
A grate 106 is placed above it. A belt support member 110 and a cooling water nozzle 111 are arranged on the back side of the belt facing the fixed mold 102. This belt support member 110 has a large number of thin disks attached at intervals around a round shaft, and the outer periphery of the thin disks contacts the belt 101 and supports the belt 101 from deflecting to this side. Further, the cooling water spouted from the cooling water nozzle 111 hits the belt 101 and flows down, but since the part of the belt support member 110 that comes into contact with the cooling water is a thin disk, the belt support member 110 obstructs the flow of the cooling water. is kept to a minimum. A pinch roll device (not shown) is installed below the mold, and torque is applied to the rolls holding the slab 109 in order to pull the slab 109 in the direction of the arrow 109a.

Regarding the thin plate continuous casting equipment with the above configuration,
To explain its operation, molten metal 107 transported by a ladle (not shown) flows into the mold from the opening 105 in the upper part of the mold via the gutter 106.

Heat is removed from the molten metal 107 in the mold by the water cooling belt 101, and the molten metal 107 solidifies from the contact surface side. At this time, the water cooling belt 101 is
Since the solidified layer 108 is moving in the direction of finish.

A molten slag supply port 1 is provided near the position where the sliding between the mold surface of the fixed mold 102 and the cast piece 109 begins.
Molten slag 112 is extruded from 15 by gas pressure to lubricate the interface between the mold surface and the cast piece. This molten slag 112 is pushed by the pressure of the pressurized gas entering from the pressurized hole 114 in the wall of the molten slag container 113 and penetrates into the interface through the passage 115. Therefore, even if there is resistance near the outlet of the passage 115, the required amount of molten slag can be supplied by increasing the pressure of the pressurized gas.

In this embodiment, when supplying molten slag to the interface between the mold surface of the fixed mold and the slab, pressurized gas is introduced into the molten slag container, and this pressure is used to press the molten slag and cause it to flow out from the opening. , is sent to the interface, resulting in the following effects.

(1) Even if resistance occurs at the outlet opening of the molten slag due to the static pressure of the molten metal, the required amount can be supplied by increasing the pressure of the pressurized gas accordingly.

(2) Since the pressure of the pressurized gas can be easily finely adjusted, the flow rate of the molten slag can be accurately controlled by detecting the flow condition of the molten slag and feeding back a control signal to the pressurized gas pressure regulator.

[Embodiment 2] FIG. 4 is a belt-type continuous thin plate casting apparatus according to Embodiment 2 of the present invention, and shows a central sectional view of only the molten slag supply section. This embodiment differs from the first embodiment in that there are two series of molten slag containers. In FIG. 4, a passage 115 that guides the molten slag 112a to the mold surface of the fixed mold 102 is connected to two passages 115a and 115b. The container 113a has a valve port 116a and a passage 115.
a, 115, and is connected to the mold surface. The container 113b has a valve port 116b and a passage 115.
b, 115, and is connected to the mold surface.

Two ports 116a, 1 of gate valve plate 116
The 16b have a positional relationship such that if one closes the passage, the other opens the passage.

The molten slag 112a in the container 113a is pressed into the pressurizing hole 1.
When extruding with the gas pressure introduced from 14a, port 116a is open and port 116b is closed.
This state is shown in FIG.

As the casting operation progresses, the molten slag 11 in this container
When 2a is consumed, the port position of gate valve plate 116 is switched. That is, close the port 116a,
Open port 116b. By this operation, the molten slag 112b in the container 113b is pushed out onto the mold surface by the gas pressure introduced from the pressurizing hole 114b.

It is desirable to build up the pressure in the vessel containing the new molten slag prior to switching the valve.

This embodiment has the following advantages in addition to the effects of the first embodiment. Two molten slag containers can be used alternately by switching valves, so while one container is in use, the other container can be refilled with molten slag and both containers can be used repeatedly to supply the mold surface. Operation can continue for long periods of time without interruption.

[Other Examples]

Fig. 5 shows an example in which the present invention is applied to a belt placed at the bottom and a fixed mold placed at the top, and Fig. 6 shows an example in which the present invention is applied to a case where the belt is placed at the top and a fixed mold placed at the bottom. An example of application is shown. The effects of both examples are the same as those of the first embodiment.

[Effects of this invention]

As described in detail above, the present invention is one in which a pressurized gas supply means is provided in the molten slag container.
By appropriately adjusting this pressurized gas, a remarkable effect is produced in that a desired amount of molten slag can be supplied very easily. Furthermore, even if the opening for supplying molten slag is blocked by the static pressure of the molten metal, in the present invention, by adjusting the pressure of the pressurized gas, the molten slag can be easily transferred to the mold surface of the fixed mold. It can be supplied to the interface of the pieces.

[Brief explanation of the drawing]

Fig. 1 and Fig. 2 show a conventional belt-type continuous thin strip casting apparatus, Fig. 1 shows its plan view, Fig. 2 shows its central cross-sectional view. Fig. 3 to Fig. 6 show central cross-sectional views of a belt-type continuous thin strip casting apparatus according to an embodiment of the present invention. 1: belt (water-cooled moving mold), 2: belt-supported cooling device, 2a→2b→2c→2d: flow of cooling water, 3, 4: pulley, 3a, 4a: direction of rotation,
5: basin, 5a: rear wall, 5b, 5c: side walls,
6: pouring trough, 7: molten metal, 7a: flowing down the trough,
7b: Falling from the ladle into the molten metal tank, 7c: Molten metal in the molten metal tank, 8: Cast piece, 8a: Front edge of solidified layer, 8
b: removal direction, 11: fixed mold, 11a: mold surface, 11b: slit, 11c: depression (pool for storing molten slag), 12: molten slag, 10
1: belt (moving mold, water-cooled), 102: fixed mold, 103: pulley, 103a: direction of rotation, 1
04: pulley, 104a: rotation direction, 105: upper opening of mold, 106: gutter, 107: molten metal, 1
08: solidified layer, 109: slab, 109a: slab removal direction, 110: belt support member, 111: cooling water nozzle, 112, 112a, 112b: molten slag, 113, 113a, 113b: molten slag container, 114, 114a, 114b: pressurizing hole, 1
15, 115a, 115b: molten slag passage, 1
16: gate valve plate, 116a, 116b: valve ports.

Claims (1)

[Scope of utility model registration request] In a belt-type continuous thin plate casting apparatus, which is composed of a belt-type moving mold and a fixed mold, and is configured to supply molten slag from a molten slag container to the interface between the fixed mold and the slab, the molten slag container is supplied with molten slag. A belt-type thin plate continuous casting apparatus characterized by being equipped with a pressurized gas supply means.