JP2975136B2 - Cooling device for continuous casting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for casting.

[0002]

2. Description of the Related Art Conventionally, in continuous casting of copper and copper alloys, a mold is cooled as follows. For example, FIG.
As shown in the figure, a mold 50 made of graphite or the like is cooled by a cooling jacket 51 mounted on the peripheral surface thereof. Also,
As shown in FIG. 4, a cooling pipe 61 may be embedded in the mold 50, and cooling water may be supplied to the cooling pipe 61 from a cooling water supply pipe 62 to cool the mold 50. By cooling the mold 50 in this way, the molten metal 52 contained in the mold 50 is solidified to obtain an ingot 53. Next, water is sprayed in an open state on the ingot 53 pulled out by the pinch roll to perform secondary cooling, thereby obtaining a cast product.

As a cooling means for the mold 53, a cooling pipe 61 is particularly excellent in that a cooling point (solidification point) can be easily adjusted.

[0004]

However, the ingot drawn from the mold has a temperature of about 500 ° C. and is still at a high temperature. For this reason, if the ingot is exposed to air before it is secondarily cooled, the surface of the ingot is oxidized and the quality of the cast product deteriorates. In order to prevent such oxidation of the ingot, it is conceivable to provide the secondary cooling means immediately after the ingot outlet of the mold. However, if water vapor generated when water is sprayed on the ingot comes into contact with the mold, graphite and the like constituting the mold will be eaten. Further, when the cooling pipe 61 is used, since the cooling pipe 61 protrudes from the mold 50 in the ingot drawing direction, it is physically impossible to provide the secondary cooling means immediately after the ingot outlet of the mold. is there.

[0005] Therefore, it is possible to prevent the oxidation of the ingot by slowing down the speed of withdrawing the ingot and cooling the surface of the ingot in the mold until the surface of the ingot becomes lower than the oxidation temperature, and then withdrawing the ingot from the mold. However, there is a disadvantage that production efficiency is reduced.

The present invention has been made in view of the above circumstances, and provides a cooling device for continuous casting which can prevent oxidation of an ingot and can perform casting at high speed and with excellent production efficiency. It is.

[0007]

According to the present invention, there is provided an ingot moving path which penetrates a central portion, and is disposed around the ingot moving path substantially parallel to the ingot moving path to cool and melt the molten metal in the mold. A primary cooling unit having a plurality of cooling pipes for solidifying to form an ingot, provided at a stage subsequent to the primary cooling unit,
A secondary cooling unit for secondary cooling of the ingot, one end of which is slidably inserted in the ingot moving path with the inner wall of the apparatus, and the other end of which extends to the front of the apparatus substantially parallel to the cooling pipe. A sealing pipe member to be protruded, and a pressure contact provided to be in contact with the one end of the sealing pipe member to press the sealing pipe member against the mold end surface by a repulsive force when the sealing pipe member slides on the mold end surface. Means and in the sealing area of the ingot in the sealing pipe member and including the ingot moving path;
A cooling device for continuous casting, comprising a gas supply means for supplying a gas for preventing oxidation of the ingot moving in the sealing region.

[0008]

According to the cooling device for continuous casting of the present invention, a gas for preventing oxidation of the ingot is filled in the sealing region formed by the end face of the mold, the sealing pipe member, and the ingot moving path. As a result, the hot ingot pulled out of the mold
Prevents oxidation through the sealing zone and down to the secondary cooling unit.

Further, when the sealing pipe member comes into contact with the mold end face and slides, the sealing pipe member is pressed against the mold end face by the repulsive force of the pressing means, so that the mold end face and the end face of the sealing pipe member come into close contact with each other.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an explanatory view showing an example of a cooling device for continuous casting according to the present invention.

In the figure, reference numeral 11 denotes a cooling device for continuous casting having a primary cooling unit 12 and a secondary cooling unit 13. The cooling device 11 for continuous casting has an ingot 14
Has an ingot moving path 15 that penetrates. The ingot 14 is drawn from a mold 21 made of, for example, graphite, ceramic-containing graphite, or the like.

The primary cooling unit 12 has an ingot 1 substantially at the center.
A hollow cylindrical first cooling water storage portion 16 having a hollow portion through which the first cooling water storage portion 4 penetrates; and a hollow cylindrical shape having the same dimensions as the first cooling water storage portion 16 provided in front of the first cooling water storage portion 16 in the apparatus. Second
And a cooling water storage unit 17. A cooling water supply port 19 through which cooling water is supplied is provided at a predetermined location below the first cooling water storage unit 16. A cooling water discharge port 20 for discharging cooling water is provided at a predetermined location above the second cooling water storage unit 17.

A plurality of cooling pipes 22 inserted into cooling pipe insertion holes 21 a formed around the ingot discharge port of the mold 21 are provided in the second cooling water storage 17. At a predetermined interval in the circumferential direction, the ingot moving path 1
5 and projecting substantially in parallel with them. Each cooling pipe 22
Each of the cooling water supply pipes 23 projecting from the first cooling water storage unit 16 is inserted into the inside of the first cooling water storage unit 16 so as to supply the cooling water from the first cooling water storage unit 16 to the cooling pipe 22.

On the other hand, the secondary cooling unit 13 includes a first cooling nozzle 24, a first ingot cooling section 25, and a second ingot cooling section 2.
6. It has a second cooling nozzle 27. That is, the first cooling nozzle 24 has an annular nozzle port 24 a inclined in the moving direction of the ingot 14, and uniformly supplies the cooling water to the peripheral surface of the ingot 14 moving in the first ingot cooling unit 25. It is designed to inject. The first cooling nozzle 24 is supplied with cooling water from a cooling water supply unit (not shown) via a cooling water supply port 24b.

A partition 28 is provided downstream of the first ingot cooling section 25.
The second ingot cooling section 26 is provided continuously with the space therebetween. Further downstream of the second ingot cooling section 26, a second cooling nozzle 27 is provided.
However, it has an annular nozzle 27a inclined in the direction opposite to the moving direction of the ingot 14, so that the cooling water is uniformly sprayed on the peripheral surface of the ingot 14 moving inside the second ingot cooling unit 26. It has become. Cooling water is supplied to the second cooling nozzle 27 from a cooling water supply unit (not shown) through a cooling water supply port 29.

First ingot cooling section 25 and second ingot cooling section 2
6 are provided with steam outlets 30 and 31 for discharging steam generated when the ingot 14 is cooled, and the lower portions of the first ingot cooling unit 25 and the second ingot cooling unit 26 are open. Has become.

The primary cooling unit 12 and the secondary cooling unit 13 configured as described above are connected by a connecting member 32.

Further, a sealing pipe member 33 is slidably inserted from the mold 21 side in the ingot moving path 15. That is, the enlarged diameter portion 34 is formed in the ingot moving path 15 immediately before the first cooling nozzle 24. A flange 35 having substantially the same size as the inner diameter of the enlarged diameter portion 34 is formed at one end of the sealing pipe member 33.
4 slides on the inner wall surface. Further, a reduced diameter portion 36 for preventing the flange 35 from falling off is formed at the end of the enlarged diameter portion 34 on the insertion side of the sealing pipe 33.

A spring 38 is arranged between the flange 35 and a wall surface 39 of the enlarged diameter portion 34 facing the flange 35.

A predetermined portion of the enlarged diameter portion 34 is provided with a mold 2.
1. A gas supply unit (not shown) for supplying a gas for preventing oxidation of the ingot 14 is connected to a sealing area 40 including the sealing pipe member 33 and the ingot moving path 15 via a gas supply port 41. ing.

The cooling device 11 for continuous casting having such a configuration can be mounted and fixed on the attitude control device 42. The attitude control device 42 includes, as shown in FIG.
3 to move on the linear way 44 laid on
A horizontal position adjuster 45, a height adjuster 46 mounted on the first horizontal position adjuster 45, a second horizontal position adjuster 47 mounted on the height adjuster 46, (2) An angle adjuster 48 mounted on the horizontal position adjuster 47 and attached to the bottom of the connecting member 32.

The continuous casting of oxygen-free copper was carried out in the following manner using the cooling device 11 for continuous casting having such a configuration.

First, the cooling device 11 for continuous casting is moved on the linear way 44 in the first horizontal direction (indicated by an arrow in FIG. 2) by the first horizontal position adjusting portion 45, and
The cooling pipe 22 is inserted into the cooling pipe insertion hole 21a.

At this time, the end face of the sealing pipe member 33 on the mold 21 side is pushed toward the enlarged diameter portion 34 by the end face around the ingot discharge port of the mold 21. Thereby, the spring 38 is compressed by the collar 35. The sealing pipe member 33 is pressed against the end face of the mold 21 by the repulsive force of the spring 38 at this time.

Here, the posture of the cooling device 11 for continuous casting can be finely adjusted by the posture control device 42 so that the end faces of the sealing pipe member 33 and the mold 21 are sufficiently adhered to each other. That is, the elevation angle of the cooling device 11 for continuous casting is adjusted by the angle adjusting unit 48. The second horizontal position adjuster 47 adjusts the position in a direction substantially perpendicular to the first horizontal direction, that is, in the paper surface direction. Further, the height of the cooling device 11 for continuous casting is adjusted by the height adjusting unit 46. When the mold 21 is vibrated in the drawing direction of the ingot 14 in order to prevent the occurrence of surface defects of the ingot 14 due to seizure of the ingot 14 and the mold 21, the cooling device 11 for continuous casting is at an angle. Vibrating means (not shown) is arranged between the adjusting part 48 and the cooling device 11 for continuous casting.
Motor vibration in the ingot withdrawal direction in synchronization with the vibration of the ingot.

The movement of the cooling device 11 for continuous casting by the first horizontal position adjusting section 45 on the linear way 44 can be performed manually or by driving means.

Next, when cooling water is supplied from the cooling water supply port 19 of the primary cooling unit 12, the cooling water is supplied from the first cooling water storage section 16 through the cooling water supply pipe 23 to the cooling pipe 2.
2. The cooling water whose temperature has been increased by cooling the mold 21 returns to the second cooling water reservoir 17 and is discharged from the cooling water outlet 20. In this way, the mold 21
By cooling the periphery of the ingot discharge port, the molten metal 14a contained in the mold 21 is solidified, and the ingot 14 is formed.

The end face of the mold 21, the sealing pipe member 3
3 and the sealing area 40 including the ingot moving path 15,
An antioxidant gas for preventing oxidation of the ingot 14 is supplied from a gas supply unit via a gas supply port 41. As the antioxidant gas, an inert gas such as a nitrogen gas and an argon gas can be used.

The ingot 14 drawn at a speed of about 1 m / minute from the mold 21 is moved in the sealing region 40 in which the antioxidant gas atmosphere has been set as described above, and the first ingot cooling unit 2
Introduce to 5. As a result, the ingot 14 does not come into contact with air outside the sealing region 40, and is thus introduced into the secondary cooling unit 13 without being oxidized.

Next, cooling water is injected from the first cooling nozzle 24 toward the ingot 14 introduced into the first ingot cooling section 25 of the secondary cooling unit 13 to cool the ingot 14. Further, the ingot 14 is introduced into the second ingot cooling unit 26, and cooling water is injected from the second cooling nozzle 27 to cool the ingot 14. As a result, about 50 when pulled out of the mold 21
The ingot 14 at 0 ° C. was finally cooled to about 60 ° C.

The ingot 14 is pulled out of the mold 21 by winding the ingot 14 around a pinch roller (not shown) provided at a stage subsequent to the ingot withdrawing direction of the cooling device 11 for continuous casting. Was.

As described above, the cooling device for continuous casting 1
According to No. 1, the ingot 14 moves inside the sealing region 40 filled with the antioxidant gas, so that the ingot 14 is prevented from being oxidized until it reaches the secondary cooling unit 13, and oxidation is prevented. The ingot 14 can be cooled to a temperature lower than the temperature. Thereby, when the ingot 14 reaches the first ingot cooling unit, it can be almost completely prevented from being oxidized by contact with air. Thereafter, almost no quality deterioration due to oxidation of the ingot 14 was observed in the casting obtained by subjecting the ingot 14 to secondary cooling.

Also, since the sealing pipe member 33 is pressed against the end face of the mold 21 by the spring 38,
And the sealing pipe member 33 can be brought into close contact with each other.

Since the cooling device for continuous casting 11 is attached to the attitude control device 42, the cooling device for continuous casting 1
The first posture can be appropriately adjusted in all directions according to the state of the mold 21. For this reason, the end face of the mold 21 and the end face of the sealing pipe member 33 can be more securely brought into close contact with each other. As a result, the sealing performance of the sealing region 40 can be further improved.

[0036]

As described above, according to the cooling apparatus for continuous casting of the present invention, the mold can be efficiently cooled by using the cooling pipe suitable for cooling the mold.
In the space region from the mold to the secondary cooling unit, oxidation of the ingot can be almost completely prevented. As a result, it has remarkable effects such as continuous casting at high speed and excellent production efficiency.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a cooling device for continuous casting of the present invention.

FIG. 2 is an explanatory diagram showing the attitude control device of the embodiment.

FIG. 3 is an explanatory view showing a cooling jacket of a conventional continuous casting mold.

FIG. 4 is an explanatory view showing a cooling pipe of a conventional continuous casting mold.

[Explanation of symbols]

11: cooling device for continuous casting, 12: primary cooling unit,
13: secondary cooling unit, 14: ingot, 15: ingot moving path, 16: first cooling water storage unit, 17: second cooling water storage unit, 21: mold, 22: cooling pipe, 23: cooling water Supply pipe, 24: first cooling nozzle, 25: first ingot cooling section, 2
6 second ingot cooling section, 27 second cooling nozzle, 32 connecting member, 33 sealing pipe member, 34 enlarged diameter section,
35 ... collar, 38 ... spring, 40 ... sealing area, 41
... gas supply port, 42 ... attitude control device, 44 ... linear way, 45 ... first horizontal position adjustment unit, 46 ... height adjustment unit, 4
7: second horizontal position adjusting section, 48: angle adjusting section.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-136266 (JP, A) JP-A-2-274346 (JP, A) JP-A-63-62252 (JP, A) 77839 (JP, A) Japanese Utility Model Hei 2-127347 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B22D 11/124 B22D 11/00 B22D 11/10 360

Claims (1)

(57) [Claims] 1. An ingot moving path penetrating a central portion, and disposed around and substantially parallel to the ingot moving path to cool and solidify bath water in a mold to form an ingot. A primary cooling unit having a plurality of cooling pipes for cooling the ingot, a secondary cooling unit for secondary cooling the ingot, provided at a stage subsequent to the primary cooling unit, and one end portion in the ingot moving path. A sealing pipe member slidably inserted into the inner wall of the device, the other end of which extends substantially in parallel with the cooling pipe to the front stage of the device; and a sealing pipe member provided in contact with the one end portion of the sealing pipe member. Biasing means provided in contact with the one end of the member, and when the sealing pipe member abuts against the mold end face and slides, presses against the mold end face by a repulsive force to maintain airtightness between them; The inside of the sealing pipe member and the ingot moving path. The free ingot of the sealing region, the sealing region continuous casting cooling apparatus characterized by comprising a gas supply means for supplying gas to prevent the oxidation of the ingot to move.