JP2003071547A - Composite mold for continuously casting of copper and copper alloy, continuous casting device for copper or copper alloy, and continuously casting method for copper or copper alloy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite mold for continuously casting, continuously casting device, and continuously casting method for copper and a copper alloy, capable of obtaining an ingot of copper and the copper alloy excellent in surface quality, by suppressing the effect caused by an airgap between the ingot surface and a mold inner wall to a minimum. SOLUTION: A mold 10 for discharging the copper and the copper alloy solidified after being supplied with a molten metal of the copper or the copper alloy, and a heat extraction assembly 20 including a catapiller 21, for rotating the side face of the ingot of the copper or the copper alloy solidified downward (casting direction) the mold 10 by the same speed as the discharging speed from the mold 10 and pushing the ingot 17, are provided.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a composite mold for continuous casting of copper and copper alloys, a continuous casting apparatus for copper or copper alloys, and a continuous casting method for copper or copper alloys, and more particularly to a surface of an ingot and an inner wall of an ingot. TECHNICAL FIELD The present invention relates to a mold for continuous casting of copper and a copper alloy in which an air gap is prevented from occurring, a continuous casting device of copper or a copper alloy, and a continuous casting method of copper or a copper alloy.

[0002]

2. Description of the Related Art FIG. 4 is a diagram showing a conventional continuous casting apparatus. FIG. 4 (a) is a diagram showing an outline of the apparatus, FIG. 4 (b).
Is a diagram showing an outline when the molten metal is poured into the mold, FIG.
FIG. 4C is a diagram showing a state of a corner portion of the mold, FIG. 4D.
[Fig. 3] is a view showing a cross section of an ingot.

Conventionally, in continuous casting of a large ingot of copper or a copper alloy, first, copper or a copper alloy is melted in a melting furnace 51, and a molten material (molten metal) 52 of the copper or the copper alloy is melted from the melting furnace 51.
Is poured into the tundish 53, and then into the mold 55 from the downcomer pipe 54 of the tundish 53. The mold 55 is made of water-cooled copper or carbon, forms a solidified shell 56 by primary cooling by removing heat from the mold 55, and the solidified shell 56 is further solidified by showering, spraying, etc. The ingot 57 is completely solidified by the secondary cooling in which water is directly applied by 58. Furthermore, ingot 5
The ingot 57 is cooled to about room temperature by charging 7 into a water tank 59 or the like. The cooled ingot 57 is continuously or intermittently drawn by a drawing device 60 such as a pinch roll or a hydraulic cylinder.

However, in the case of primary cooling, contraction of the solidification shell 56 occurs in the mold 55, but an air gap 70 is created between the surface 56a of the solidification shell 56 and the inner wall 55a of the mold 55, and therefore this portion 70 is formed. In this case, problems such as coarsening of the solidified structure due to insufficient heat removal and cracks 56b on the surface of the ingot due to remelting of the solidified shell may occur (see FIG. 4 (c)). In particular, in copper alloys, the occurrence of air gaps is more remarkable than in pure copper, which has been a major factor in lowering the quality of the ingot. Further, in the ingot 57a having a rectangular cross section, the air gap 71 was likely to occur in the center of the long side where the cooling rate was relatively slow in the cross section of the mold (see FIG. 4D).

Therefore, as means for preventing the occurrence of such an air gap, particularly in the case of vertical continuous casting, the taper in the casting direction (downward) of the mold, the effective length of the mold, the primary cooling and the secondary cooling. The heat removal flow rate, the balance of the heat removal flow rate in the direction perpendicular to the casting direction, and optimization of parameters such as casting speed are mentioned.

[0006]

However, in the conventional method for determining the optimization of the parameters, the parameters are subtly changed in the actual casting work, and the occurrence of the air gap cannot be directly confirmed. However, there is a problem that it is difficult to completely prevent the generation of the air gap.

When the taper of the mold in the casting direction (downward) is steep, friction occurs between the surface of the ingot and the inner wall of the mold at the corners of the mold where cooling of the ingot or solidified shell is relatively strong. There is a problem that the surface of the ingot and the inner wall of the mold may be greatly damaged.

Therefore, an object of the present invention is to prevent damage to the ingot surface by minimizing the influence of the air gap between the ingot surface and the inner wall of the mold in the continuous casting of copper and copper alloy. It is an object of the present invention to provide a continuous casting mold for copper and copper alloys, a continuous casting device for copper or copper alloys, and a continuous casting method for copper or copper alloys, which can cast ingots with good surface quality.

[0009]

In order to achieve the above-mentioned object, the present invention is a mold used in a continuous casting apparatus for copper or copper alloy, wherein the mold is supplied with molten metal of copper or copper alloy, A continuous casting apparatus for copper and copper alloys, which is arranged below the mold (casting direction) and is configured to include a pressing member that presses a side surface of a copper or copper alloy ingot discharged from the mold. Provide a composite mold.

Further, the pressing member is a heat removal assembly having a plurality of metal strip endless tracks driven by a driving device at the same speed as the discharging speed of the ingot from the mold. Provided is a composite mold for a copper alloy continuous casting device.

Further, the heat removal assembly is provided with a composite mold for a copper and copper alloy continuous casting apparatus, which is equipped with an actuator for pressing the metal strip endless track against the ingot.

In order to achieve the above-mentioned object, the present invention provides a continuous casting apparatus for copper or copper alloy, in which a molten metal of copper or copper alloy is supplied to a mold and solidified to form an ingot. Direction) in which a heat removal assembly including a metal band endless track for rotating the ingot side surface at the same speed as the discharge speed from the mold and pressing the ingot is provided. A casting device is provided.

In order to achieve the above object, the present invention provides a continuous casting method of copper or a copper alloy in which a molten metal of copper or a copper alloy is supplied to a mold to form an ingot, in the lower side of the mold (casting direction). There is provided a continuous casting method for copper or copper alloy, comprising a step of pressing a side surface of the ingot.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A composite mold for continuous casting of copper and copper alloys, a continuous casting apparatus for copper or copper alloys, and a continuous casting method for copper or copper alloys according to the present invention will be described.

FIG. 1 is a diagram showing an outline of a continuous casting apparatus using a composite mold for continuous casting according to the present invention, FIG. 2 is a longitudinal sectional view of a heat removal assembly, and FIG. 3 is a transverse sectional view of a heat removal assembly. .

The main part of the continuous casting apparatus 100 for copper and copper alloys comprises a mold 30, a secondary cooling device 15, and a water tank 16.

The mold 30 is composed of a mold 10 to which a molten metal of copper or copper alloy is supplied, and a heat removal assembly 20 below which a metal band endless track 21 made of a metal band of copper or the like is arranged. The mold 10 is a hollow rectangular parallelepiped made of copper or carbon, and the inside of its wall is cooled with water or the like.

At the lower part of the mold 10, water for cooling the ingot 17 discharged from the lower part of the mold 10 by cooling a metal band endless track 21 described later is spouted in the form of a spray or a shower of cooling water. A mouthpiece 12 is provided.

The heat removal assembly 20 supports a metal band endless track 21 made of a metal band such as copper, a plurality of rotating shafts 28 for rotating the metal band endless track 21, a metal band endless track 21, and a hydraulic cylinder. A support body 2 for horizontally pressing the metal strip endless track 21 by means of a support shaft 27.
5. A drive motor 24 for rotating the metal band endless track 21, a power transmission shaft 26 for transmitting the rotation of the drive motor 24 to the metal band endless track 21, and a horizontal position of the metal band endless track 21 via a hydraulic cylinder 22. And an actuator 23 for pressing in the direction.

The secondary cooling device 15 is a device for directly applying water to the ingot to completely solidify the ingot. The water tank 16 is for further lowering the temperature of the ingot to about room temperature. Reference numeral 17 is an ingot in which molten metal of copper or copper alloy is solidified.

The operation of the above continuous casting apparatus 100 will be described.

A molten metal of copper or the same alloy is poured into the mold 10 through a tundish downcomer (not shown). The poured molten metal is cooled on the inner wall of the mold 10 to form a solidified shell. When the solidified shell has a sufficient thickness, it is extruded as an ingot 17 from the lower end (casting direction side) of the mold 10.

The extruded ingot 17 further descends while being pressed in the horizontal direction by the metal strip endless track 21 formed of a metal strip such as copper. When the metal strip endless track 21 is pressed in the horizontal direction, the hydraulic pressure in the hydraulic cylinder is set in advance so that a predetermined pressure is applied. Since the ingot 17 is pressed by the metal strip endless track 21, the lower end of the mold 10 and the heat removal assembly 20
Although the cross-sectional size of the ingot 17 is different from the lower end, the actuator 23 controls the contact surface of the metal strip endless track 21 to be maximum.

Since the ingot 17 is pressed by the metal strip endless track 21 in this way, it is possible to prevent an air gap from being generated in the center of the long side where the cooling rate is slow in the cross section of the mold 10. In addition, the surface of the ingot and the mold 10
Even if an air gap is generated between the inner wall surface of the ingot and the ingot, the metal band endless track 21 presses the ingot 17 to compress the ingot 17, so that cracks and rough skin formed on the ingot surface can be repaired. Therefore, damage to the surface of the ingot can be minimized. Therefore, it becomes possible to continuously cast ingots having good surface quality.

The metal band endless track 21 rotates as the ingot 17 descends. This is because by rotating the drive motor 24, the power transmission shaft 26 connected to the drive motor 24 rotates, and by transmitting the rotation to the metal band endless track 21, the metal band endless track 21 rotates. It is a thing.

Although the drive motor 24 is used in the figure, the metal band endless track may be rotated by the frictional force between the surface of the ingot 17 and the metal band endless track.

After passing through the heat removal assembly 20, the ingot 17 is submerged with water so as to completely solidify the secondary cooling device 15.
Through the water tank 16 in order to further lower the temperature of the ingot 17.
Can be put in. The ingot 17 that has been sufficiently cooled is taken out by an appropriate means, made into an appropriate size, and used as a raw material for various articles.

Although the above description has been made on the vertical continuous casting apparatus, it can be applied to a horizontal continuous casting apparatus without any substantial change.

[0029]

EXAMPLE A copper-iron-phosphorus-based copper alloy melt was supplied into the mold from a tundish downcomer by a vertical continuous casting apparatus, and continuous casting was performed at a casting speed of 90 mm / min. The mold is made of copper alloy with chromium and zirconium added, cross section size 180mm x 500mm, length 25
It is 0 mm. In the casting direction (downward), taper processing of 15 'on the long side and 30' on the short side is performed. The molten metal surface was 50 mm from the upper end of the mold, and the molten metal surface was covered with flux. The mold was supplied with 1,000 l / min of cooling water.

Immediately below the mold, there was installed a heat removal assembly consisting of two stages in the casting direction, five rows in the long side direction and two rows in the short side, the metal strip endless track. The length of one step is 150m
m. The drain of the mold cooling water was cooled to 100 l / min on the side of the metal strip endless track not in contact with the ingot. The hydraulic cylinder was controlled so that a pressure of 5 MPa was applied to the surface of the ingot. 90mm / according to casting speed
The drive motor was controlled so as to rotate at min.

100 mm long just below the heat removal assembly
And a cooling water on the spray was sprinkled on the ingot at 500 l / min. A water tank was provided below the secondary cooling zone to cool the ingot to room temperature.

No cracks, scratches, deep dents, etc. were found on the surface of the ingot, and the wrinkles in the hot water were shallow, and the appearance was good.

(Comparative Example) A copper-iron-phosphorus-based copper alloy melt was supplied into the mold from a tundish downcomer by a vertical continuous casting apparatus, and continuous casting was performed at a casting speed of 90 mm / min. The mold is made of a copper alloy with chromium and zirconium added, and the cross-sectional size is 180 mm x 500.
mm and length 400 mm. In the casting direction (downward), taper processing of 20 'on the long side and 40' on the short side is performed. 50mm from the top of the mold
Coated with flux. 1,000 l / m for mold
In cooling water was supplied.

A secondary cooling zone was provided immediately below the mold, and 500 l / min of cooling water was applied to the ingot. A water tank was provided below the secondary cooling zone to cool the ingot to room temperature.

On the surface of the ingot, periodic deep dents and minute cracks were found in the casting direction.

[0036]

As described above, according to the continuous casting using the copper and copper alloy continuous casting mold according to the present invention,
Since the ingot is pressed by the metal band endless track, the influence of the air gap between the ingot surface and the mold inner wall is minimized, and cracks, scratches, deep dents, etc. are generated on the ingot surface. It is not seen, and the wrinkles in the molten metal are shallow, and ingots of copper and copper alloy with good appearance quality can be continuously produced.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a continuous casting apparatus using a mold according to the present invention.

FIG. 2 is a vertical cross-sectional view of the heat removal assembly.

FIG. 3 is a cross-sectional view of the heat removal assembly.

FIG. 4 is a view showing a conventional continuous casting device.

[Explanation of symbols]

10 Mold 12 Cooling water spout 15 Secondary cooling device 16 aquarium 17 Ingot 20 Heat removal assembly 21 Metal band endless orbit 22 Hydraulic cylinder 23 Actuator 24 Drive motor 25 support 26 Power transmission shaft 27 Support shaft 28 rotation axis 30 molds 51 melting furnace 53 Tundish 54 Downcomer 55 Mold 55a inner wall 56 solidified shell 56a surface 56b Cracking of ingot surface 57 Ingot 57a Ingot 59 water tanks, etc. 60 devices 70 air gap 70 pieces 71 Air gap 100 Continuous casting equipment

Claims (5)

[Claims] 1. A mold used in a continuous casting apparatus for copper or copper alloy, comprising a mold to which a molten metal of copper or copper alloy is supplied, and a mold disposed below the mold (casting direction) and discharged from the mold. And a pressing member that presses a side surface of a copper or copper alloy ingot, and a composite mold for a copper and copper alloy continuous casting apparatus. 2. A heat removal assembly comprising a plurality of metal strip endless tracks driven by a driving device at the same speed as the discharging speed of the ingot from the mold. 1. A composite mold for a copper and copper alloy continuous casting apparatus according to 1. 3. The composite mold for a continuous casting apparatus for copper and copper alloys according to claim 2, wherein the heat removal assembly includes an actuator for pressing the metal strip endless track against the ingot. 4. A copper or copper alloy continuous casting apparatus for supplying a molten metal of copper or a copper alloy to a mold and solidifying the molten metal into a ingot, wherein the ingot side surface is below the mold (casting direction). A continuous casting device for copper or copper alloy, comprising a heat removal assembly including a metal strip endless track that rotates at the same speed as the discharge speed from the above and presses the ingot. 5. A method of continuously casting copper or a copper alloy in which a molten metal of copper or a copper alloy is supplied to a mold to form an ingot, which comprises pressing a side surface of the ingot below the mold (casting direction). A continuous casting method for copper or a copper alloy, comprising: