Magnesium alloy ingot casting mold cooling mechanism

Abstract

The invention discloses a magnesium alloy ingot casting mold cooling mechanism which comprises a continuous casting machine body, a rotating structure is arranged in the continuous casting machine body, a plurality of molds are arranged and installed on the rotating structure in the moving direction, a partition cover and a water pipe are sequentially arranged in the middle of the rotating structure from top to bottom, and a spray head spraying downwards is installed on the water pipe. A negative pressure fan blowing air outwards is arranged on the side face of the continuous casting machine body and located between the isolation cover and the water pipe. According to the magnesium alloy ingot casting mold cooling mechanism, the cooling time of the mold can be shortened in the continuous casting process, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of magnesium alloy smelting, and in particular to a cooling mechanism for a magnesium alloy ingot casting mold. Background Art

[0002] With the development of science and technology, magnesium alloy has been attracting much attention as one of the most environmentally friendly lightweight materials. It has a wide range of applications in aerospace, electronic communications and automotive industries, as well as in people's daily lives. Magnesium alloy ingots as raw materials need to be obtained through a smelting and casting process. The molten magnesium liquid is injected into a mold and solidified and cooled to form a magnesium alloy ingot.

[0003] Before casting magnesium alloy ingots, the mold will be preheated with a heater to prevent the formation of hollow depressions at the bottom of the magnesium alloy ingot due to the large temperature difference when high-temperature magnesium liquid is injected into the mold. Secondly, micro cracks may be caused to damage the mold, and in severe cases, the mold may burst directly.

[0004] During the continuous casting production process of magnesium alloy ingots, the mold temperature rises sharply due to long-term contact with high-temperature magnesium liquid, and the mold temperature can reach 350℃-400℃. If the temperature is not cooled down in time, the molten magnesium alloy liquid injected into the mold cannot solidify in time. On the one hand, the oxidation burning rate of the magnesium alloy will increase, the heat of the magnesium liquid in the center of the magnesium ingot cannot be dissipated, the solidification speed is slow, and the magnesium ingot will burn and break; on the other hand, when the mold temperature is high, the solidification speed of the magnesium liquid is slow, the solubility of gases such as hydrogen in the magnesium alloy increases, and it is not easy to precipitate, thereby reducing the physical properties of the magnesium alloy ingot. Therefore, in the continuous casting process, it is extremely important to control the mold temperature. However, it is difficult to meet the requirements by relying on the heat transfer and cooling of the mold itself.

[0005] At present, air cooling is mostly used in the magnesium alloy melting and casting process. The principle is to use the flowing air medium to exchange heat with the mold. However, since the cooling air is in a flowing state, it is difficult to reduce the mold temperature from 350℃-400℃ to about 200℃ in a short time. The mold cannot be cooled down in time and effectively. The mold needs to wait for a long time and the cooling efficiency is low. However, in the continuous casting process, this greatly reduces the production efficiency.

[0006] Therefore, in view of the above problems, the present invention provides a magnesium alloy ingot casting mold cooling mechanism to solve the existing problems. Summary of the invention

[0007] The purpose of the present invention is to provide a magnesium alloy ingot casting mold cooling mechanism, which can shorten the mold cooling time during the continuous casting process, enable the mold to enter the temperature state for the next casting more quickly, and greatly improve the production efficiency.

[0008] In order to achieve the above-mentioned purpose, the present invention provides a cooling mechanism for a magnesium alloy ingot casting mold, comprising a continuous casting machine body, a rotating structure is arranged in the continuous casting machine body, a plurality of molds are arranged and installed on the rotating structure along the moving direction, a partition cover and a water pipe are arranged in sequence from top to bottom in the middle of the rotating structure, a nozzle for spraying downward is installed on the water pipe, and a negative pressure fan for blowing air outward is arranged on the side of the continuous casting machine body between the partition cover and the water pipe.

[0009] Preferably, the rotating structure includes movable guide rails arranged on both sides, and both ends of the mold are respectively installed on the movable guide rails on both sides, and the movable guide rails can rotate along the track grooves.

[0010] Preferably, a plurality of columns are arranged in the body of the continuous casting machine; the two columns located at the two ends are symmetrically arranged, a rotating shaft is arranged between the two symmetrical columns, and a gear meshing with the movable guide rail is sleeved on the rotating shaft; one of the rotating shafts is connected to a driving motor.

[0011] Preferably, an L-shaped heater is provided at the front end of the continuous casting machine body, and a temperature sensor is provided on the L-shaped heater.

[0012] Preferably, the tail end of the continuous casting machine body is arranged as a discharge port.

[0013] Preferably, a pouring port and a protective plate are sequentially arranged on the continuous casting machine body between the L-shaped heater and the discharge port.

[0014] Preferably, an exhaust pipe is provided at the outer end of the negative pressure fan.

[0015] Preferably, a plurality of lifting foot cups are provided at the bottom of the continuous casting machine body.

[0016] Preferably, a water storage tank is provided at the inner bottom of the continuous casting machine body; a drainage port is provided on the side of the water storage tank.

[0017] Preferably, the plurality of nozzles are distributed in a matrix, and a water flow controller is provided at the water inlet of the water pipe.

[0018] According to the above technical scheme, the cooling mechanism of the magnesium alloy ingot casting mold in the present invention has the following beneficial effects: multiple molds are driven to rotate through the rotating structure to achieve continuous casting, and the cooling water supplied in the water pipe is sprayed on the mold below through the nozzle to cool the mold. Since the cooling water sprayed on the mold surface will generate water vapor, the shield and negative pressure fan design can effectively prevent the water vapor from flowing upward and affecting the ingot protective gas, and discharge the water vapor.

[0019] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a structural schematic diagram of a preferred implementation of a cooling mechanism for a magnesium alloy ingot casting mold;

[0022] Figure 2 yes Figure 1 Schematic diagram of the local structure inside the middle A area;

[0023] Figure 3 It is a side view of a preferred embodiment of a cooling mechanism for a magnesium alloy ingot casting mold;

[0024] Figure 4 It is a schematic diagram of the arrangement structure of a preferred embodiment of a water pipe and a nozzle.

[0025] Description of Reference Numerals

[0026] 1-continuous casting machine body; 2-lifting foot cup; 3-mold; 4-movable guide rail; 5-L-type heater; 6-protective plate; 7-temperature sensor; 8-discharge port; 9-shield; 10-water pipe; 11-water inlet; 12-negative pressure fan; 13-water storage tank; 14-drain outlet; 15-exhaust pipe; 16-nozzle; 17-column; 18-gear; 19-water flow controller. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0028] In the present invention, unless otherwise stated, directional words contained in terms such as "up, down, left, right, front, back, inside, outside" merely represent the orientation of the terms in normal usage, or are common names understood by those skilled in the art, and should not be regarded as limitations on the terms.

[0029] See also Figure 1-4The magnesium alloy ingot casting mold cooling mechanism shown includes a continuous casting machine body 1, a rotating structure is arranged in the continuous casting machine body 1, and a plurality of molds 3 are arranged and installed on the rotating structure along the moving direction, a partition 9 and a water pipe 10 are arranged in sequence from top to bottom in the middle of the rotating structure, a nozzle 16 for spraying downward is installed on the water pipe 10, and a negative pressure fan 12 for blowing air outwards is arranged on the side of the continuous casting machine body 1 between the partition 9 and the water pipe 10.

[0030] Through the implementation of the above technical solution, multiple molds 3 are driven to rotate through the rotating structure, thereby realizing continuous casting. The cooling water supplied in the water pipe 10 is sprayed on the mold 3 below through the nozzle 16 to cool the mold. Since water vapor is generated when the cooling water is sprayed on the surface of the mold 3, the design of the partition cover 9 and the negative pressure fan 12 can effectively prevent the water vapor from flowing upward and affecting the ingot protective gas, and discharge the water vapor.

[0031] In this embodiment, the rotating structure includes movable guide rails 4 arranged on both sides, and the two ends of the mold 3 are respectively mounted on the movable guide rails 4 on both sides, and the movable guide rails 4 can rotate along the track groove. Through such a setting, the movable guide rails 4 are located in the track groove and rotate circumferentially, thereby driving multiple molds 3 to rotate along the rotation route, and realizing the heating, pouring and discharging steps from the front end to the rear end.

[0032] In this embodiment, a plurality of columns 17 are arranged in the body of the continuous casting machine; the two columns 17 at the two ends are arranged symmetrically, and a rotating shaft is arranged between the two symmetrical columns 17, and a gear 18 meshing with the movable guide rail 4 is sleeved on the rotating shaft; one of the rotating shafts is connected to a driving motor. With such an arrangement, the rotation of the driving motor drives the rotating shaft to rotate, and then drives the gear 18 to rotate. Since the gear 18 is meshing with the movable guide rail 4, the movable guide rail 4 can be driven to rotate.

[0033] In this embodiment, an L-shaped heater 5 is provided at the front end of the continuous casting machine body 1, and a temperature sensor 7 is provided on the L-shaped heater 5. The L-shaped heater 5 is placed at the front end of the continuous casting machine body 1 and is L-shaped, and is used to preheat the mold 3 before casting to prevent a large temperature difference from being generated when the high-temperature magnesium liquid meets the low-temperature mold 3, resulting in microcracks in the mold 3, which may cause the mold 3 to burst directly in severe cases.

[0034] The temperature sensor 7 can strictly monitor the temperature change, and the actual temperature value displayed by the temperature sensor 7 can be used to control the size of the cooler water flow controller 19 to avoid a large temperature drop of the mold 3.

[0035] In this embodiment, the tail end of the continuous casting machine body 1 is configured as a discharge port 8. The discharge port 8 is used to transport the magnesium alloy ingot.

[0036] In this embodiment, a pouring port and a protective plate 6 are sequentially arranged on the continuous casting machine body 1 between the L-shaped heater 5 and the discharge port 8. The pouring port can expose the mold 3 to facilitate pouring into the mold 3. The protective plate 6 is placed above the mold 3 to prevent the casted magnesium ingot from being oxidized by contact with air. A protective gas pipeline is arranged on the inner side of the protective plate 6 to prevent the protective gas from flowing out.

[0037] In this embodiment, an exhaust pipe 15 is provided at the outer end of the negative pressure fan 12. The negative pressure fan 12 is connected via the exhaust pipe 15 to discharge water vapor.

[0038] In this embodiment, a plurality of lifting cups 2 are provided at the bottom of the continuous casting machine body 1. The lifting cups 2 are used to adjust the height of the continuous casting machine and maintain a balanced position.

[0039] In this embodiment, a water tank 13 is provided at the inner bottom of the continuous casting machine body; a drain port 14 is provided on the side of the water tank 13. The water tank 13 is used to store excess cooling water sprayed from the mold 3, and an extremely fine screen is provided in the water tank 13 to filter impurities and oxides flushed into the water tank 13 by the cooling water. The drain port 14 is placed on the side of the water tank 13 and is connected to the water pipe 10 to discharge the contaminated cooling water for treatment.

[0040] The water tank 13 is for emergency use. An extremely fine screen is provided in the water tank 13. The water tank 13 is basically not used during normal water cooling. When the cooling water encounters the mold 3 at 350°C-400°C, it will instantly vaporize, and at the same time, the impurities and oxides on the surface of the mold 3 will be washed into the water tank 13. Therefore, an extremely fine screen is provided in the water tank 13 to filter impurities. A drain port 14 is provided on the side of the water tank 13, which is not recycled to avoid clogging the nozzle 16 by contaminated cooling water.

[0041] In this embodiment, the plurality of nozzles 16 are distributed in a matrix, and a water flow controller 19 is provided at the water inlet 11 of the water pipe 10. A conical cover is provided at the front end of the nozzle 16, which can effectively increase the spraying area and evenly spray and cover the surface of the mold 3 to avoid uneven cooling of the mold 3. The water flow controller 19 is used to control the cooling water flow at the water inlet 11 to avoid too much flow, which causes the temperature of the mold 3 to drop to a low point and affects the casting of the magnesium alloy.

[0042] See also Figure 4As shown, the water pipe 10 is combined to form a plurality of straight water channels, each of which is provided with a nozzle 16. The parallel structure of the water channel design can effectively cool the mold 3 and cool it to the required temperature range in a relatively short time, thereby improving production efficiency. The water inlet 11 is placed at the center of the stainless steel water pipe 10 for water inlet. A water flow controller 19 is provided at the water inlet 11 to strictly control the water inlet flow and effectively control the temperature of the mold 3.

[0043] In the present invention, the shield 9 is designed to be closed, which can effectively block the upward flow of water vapor and prevent the upward flow of water vapor from affecting the ingot protection gas.

[0044] The use method of the cooling mechanism of the magnesium alloy ingot casting mold of the present invention is as follows: before casting the magnesium alloy ingot, the driving gear 18 rotates, and the mold 3 starts to rotate in the circumferential direction under the drive of the movable guide rail 4, and the L-shaped heater 5 is turned on to preheat the mold 3 to avoid a large temperature difference when the high-temperature magnesium liquid meets the low-temperature mold 3, which causes micro cracks in the mold 3, and in severe cases, may cause the mold 3 to burst directly, and the temperature sensor 7 monitors the temperature of the mold 3. When the mold temperature reaches 200°C, the L-shaped heater 5 stops heating; during the continuous casting and molding process of the magnesium alloy ingot, the molded magnesium alloy ingot is taken out and placed by the worker at the discharge port 8, and the mold 3 rotates downward as the gear 18 rotates, and cooling water passes through the water inlet 11 The water vaporizes at the moment of contact with the mold 3, and a large amount of water vapor moves upward. Under the obstruction of the partition 9, the water vapor is controlled in the area below the partition 9. The water vapor is sucked out by the lateral negative pressure fan 12 and discharged through the exhaust pipe 15. When the cooled mold 3 continues to move forward to the temperature sensor 7, its temperature value can be monitored to see if it is within a reasonable range, so as to avoid the temperature of the mold 3 dropping to a low point and affecting the casting operation. The water flow controller 19 can also be adjusted based on this temperature display value.

[0045] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0046] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0047] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A magnesium alloy ingot casting mold cooling mechanism, characterized in that: The magnesium alloy ingot casting mold cooling mechanism comprises a continuous casting machine body (1), wherein a rotating structure is arranged inside the continuous casting machine body (1), and a plurality of molds (3) are arranged on the rotating structure along the moving direction, and a partition cover (9) and a water pipe (10) are arranged in sequence from top to bottom in the middle of the rotating structure, and a nozzle (16) for spraying downward is installed on the water pipe (10), and a negative pressure fan (12) for blowing air outward is arranged on the side of the continuous casting machine body (1) between the partition cover (9) and the water pipe (10).

2. The magnesium alloy ingot casting mold cooling mechanism according to claim 1, characterized in that: The rotating structure comprises movable guide rails (4) arranged on both sides; The two ends of the mold (3) are respectively mounted on the movable guide rails (4) on both sides, and the movable guide rails (4) can rotate along the track groove.

3. The magnesium alloy ingot casting mold cooling mechanism according to claim 2, characterized in that: A plurality of columns (17) are arranged in the main body of the continuous casting machine; The two upright posts (17) at the two ends are symmetrically arranged, a rotating shaft is arranged between the two symmetrical upright posts (17), and a gear (18) meshing with the movable guide rail (4) is sleeved on the rotating shaft; One of the rotating shafts is connected to a driving motor.

4. The magnesium alloy ingot casting mold cooling mechanism according to claim 1, characterized in that: An L-shaped heater (5) is arranged at the front end of the continuous casting machine body (1), and a temperature sensor (7) is arranged on the L-shaped heater (5).

5. The magnesium alloy ingot casting mold cooling mechanism according to claim 4, characterized in that: The tail end of the continuous casting machine body (1) is arranged as a discharge port (8).

6. The magnesium alloy ingot casting mold cooling mechanism according to claim 5, characterized in that: A pouring port and a protective plate (6) are sequentially arranged on the continuous casting machine body (1) between the L-shaped heater (5) and the discharge port (8).

7. The magnesium alloy ingot casting mold cooling mechanism according to claim 1, characterized in that: An exhaust pipe (15) is provided at the outer end of the negative pressure fan (12).

8. The magnesium alloy ingot casting mold cooling mechanism according to claim 1, characterized in that: A plurality of lifting foot cups (2) are arranged at the bottom of the continuous casting machine body (1).

9. The magnesium alloy ingot casting mold cooling mechanism according to claim 1, characterized in that: The inner bottom of the continuous casting machine body is provided with a water storage tank (13); A drainage outlet (14) is provided on the side of the water storage tank (13).

10. The magnesium alloy ingot casting mold cooling mechanism according to claim 1, characterized in that: The plurality of nozzles (16) are distributed in a matrix, and a water flow controller (19) is provided at the water inlet (11) of the water pipe (10).

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