Metal magnesium reduction tank upper and lower cone casting mold

Abstract

The utility model relates to non ferrous metal smelting equipment technical field more specifically, relate to a kind of metal magnesium reduction tank upper and lower cone casting mould. Including tank top mould unit, middle part reduction tank body and tank bottom mould unit, tank top mould unit includes tank top mould, tank top steel core and tank top sand-coated layer, tank bottom mould unit includes tank bottom mould, tank bottom steel core, tank bottom sand-coated layer, cone sand core, straight sand core, cone sand core stop disc and straight sand core stop disc, middle part reduction tank body front section is provided with tank top mould unit, rear end is provided with tank bottom mould unit, tank top steel core is set in tank top mould inside. The equipment is a kind of casting mould suitable for the special-shaped structure of metal magnesium reduction tank upper and lower cone, by optimizing the inner core forming structure of mould and component cooperation mode, improve the forming precision and density of casting, solve the problem of air hole, air leakage and other problems existing in existing casting process. The utility model is mainly applied to metal magnesium reduction tank upper and lower cone casting.

Description

Technical Field

[0001] This utility model relates to the field of non-ferrous metal smelting equipment technology, and more specifically, to a casting mold for the upper and lower cones of a magnesium reduction tank. Background Technology

[0002] Magnesium metal, as a core category of lightweight non-ferrous metals, boasts advantages such as low density, high specific strength, and excellent recyclability, making it a key basic material in aerospace, rail transportation, and new energy fields. It occupies an important position in high-end manufacturing and lightweight development strategies, and the industry's market demand and application scale are showing a continuous growth trend. The reduction vessel is a core forming equipment in the magnesium smelting process. Its upper and lower cones are key structural components, directly determining the sealing performance and service life of the reduction vessel under high-temperature, high-pressure, and vacuum smelting conditions.

[0003] Currently, the upper and lower cones of the magnesium reduction vessel are difficult to form due to their irregular flared shape, making them a manufacturing challenge in the industry. Existing casting processes have poor adaptability to this irregular structure, resulting in the upper and lower cones generally having insufficient density and numerous internal porosity defects. Under vacuum smelting conditions, gas leakage is likely to occur, which not only causes the loss of magnesium raw materials but also reduces the overall smelting efficiency of the reduction vessel, seriously restricting the stable operation of the magnesium smelting production line.

[0004] Currently, the industry mostly uses ordinary sand casting to prepare the upper and lower cones of the reduction tank. Although this process can achieve the basic forming of irregular structures, the forming accuracy of the mold is low, the gap between the sand core and the outer mold is difficult to control precisely, and the density of the casting cavity is insufficient. After pouring, defects such as porosity and shrinkage are easily generated during the solidification process of the molten metal. At the same time, the castings produced by ordinary sand casting have low density, which cannot meet the working conditions of vacuum sealing of the reduction tank. In addition, the subsequent machining allowance of the castings is large, which greatly increases the production and manufacturing cost and is difficult to adapt to the needs of large-scale and efficient development in the magnesium smelting industry. Utility Model Content

[0005] To overcome the shortcomings of the existing technology, this utility model provides a casting mold for the upper and lower conical sections of a magnesium reduction tank. This equipment is a casting mold adapted to the irregularly shaped upper and lower conical sections of a magnesium reduction tank. By optimizing the mold's internal core forming structure and component fitting methods, it improves the casting accuracy and density, solves problems such as porosity and leakage in existing casting processes, and simultaneously achieves precise assembly and efficient disassembly of the mold, reducing production costs and meeting the high-quality manufacturing requirements of the magnesium smelting industry for the core structural components of the reduction tank.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A casting mold for a magnesium reduction tank with upper and lower conical sections includes a top mold unit, a middle reduction tank body, and a bottom mold unit. The top mold unit includes a top mold body, a top steel core, and a top sand coating layer. The bottom mold unit includes a bottom mold body, a bottom steel core, a bottom sand coating layer, a conical sand core, a straight sand core, a conical sand core plug, and a straight sand core plug. The top mold unit is located at the front of the middle reduction tank body, and the bottom mold unit is located at the rear. The top steel core is located inside the top mold body, and the top sand coating layer is located between the top mold body and the top steel core. The bottom steel core is located inside the bottom mold body, and the bottom sand coating layer is located between the bottom mold body and the bottom steel core. The conical sand core is fitted to the bottom steel core, and the straight sand core is coaxially aligned with the central axis of the conical sand core. The conical sand core plug is fitted to the conical sand core, and the straight sand core plug is fitted to the straight sand core.

[0008] The tank top mold unit also includes a cantilever machine shaft end flange, a gating pipe, and a tank top cone pin. The cantilever machine shaft end flange is located on the upper outer side of the tank top mold body. The gating pipe passes through the cantilever machine shaft end flange and the tank top mold body and is connected to the casting cavity. The tank top cone pin is located on the mating connection surface between the cantilever machine shaft end flange and the tank top mold body to achieve precise positioning of the two.

[0009] The top mold unit also includes a top connecting bolt group, and the bottom mold unit also includes a bottom connecting bolt group. The top connecting bolt group is used to connect the cantilever machine shaft end flange to the top mold body, the bottom connecting bolt group is used to connect the conical sand core plug to the bottom mold body, and the bottom connecting bolt group is used to connect the straight sand core plug to the bottom mold body.

[0010] The steel core at the top of the tank has a long conical section structure, and the steel core at the bottom of the tank has a short conical section structure.

[0011] Both the top and bottom sand layers of the tank are high-temperature resistant sand layers, which isolate the molten metal from the metal surface of the mold and ensure the surface forming quality of the casting.

[0012] Both the top and bottom mold bodies are forged structures without forging defects. After rough machining, the top and bottom mold bodies undergo quenching and tempering treatment. Both the top and bottom mold bodies are subjected to ultrasonic testing before and after heat treatment, and no equivalent defects are found.

[0013] Both the top and bottom steel cores of the tank are forged from forged billets and have no forging defects. The top and bottom steel cores are subjected to quenching and tempering treatment after rough machining. Both the top and bottom steel cores are subjected to ultrasonic flaw detection before and after heat treatment and have no equivalent defects.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This magnesium reduction vessel's upper and lower conical casting mold achieves improved structural adaptability and forming precision in irregularly shaped conical casting by optimizing the structural layout and fit of core components, demonstrating significant structural design advantages and practical value. The mold employs a layered coaxial forming structure of the mold body, steel core, and sand core. The steel core and conical sand core are precisely connected through a conical surface, while the conical sand core and straight sand core are coaxially positioned relative to each other along the axis. Combined with an independent axial limiting structure, this ensures both the coaxiality of the inner core forming structure and more precise positioning of each forming component, effectively preventing component misalignment during centrifugal casting and ensuring the continuity and stability of the casting cavity surface. A uniform sand coating covers the outer surfaces of each metal inner core and sand core, forming a continuous and dense casting cavity with the inner surface of the mold body. This effectively isolates the molten metal from the mold's metal surface, improving the surface forming quality of the casting, reducing casting defects, and ensuring the density of the casting.

[0016] Meanwhile, the modular design of the mold makes it easy to disassemble and assemble each component. The conical sand core plug and the straight sand core plug are detachably connected to the mold body. After casting, the casting can be quickly disassembled and removed, improving production efficiency. The steel core has a long and short conical section structure, which is adapted to the forming requirements of the upper and lower cones respectively, realizing the structural reuse of the core components of the mold and optimizing the overall adaptability of the mold.

[0017] Both the mold body and the steel core are formed by forging and subjected to heat treatment and flaw detection, resulting in higher structural strength and forming accuracy. This makes it suitable for the working conditions of centrifugal casting, extends the service life of the mold, and solves the problems of low forming accuracy, many casting defects, and inconvenient disassembly and assembly of traditional casting molds from the structural design level. It is also suitable for the high-quality casting requirements of the upper and lower cones of the magnesium reduction tank. Attached Figure Description

[0018] Figure 1 This is the structural assembly drawing of this utility model;

[0019] Figure 2 This is an assembly drawing of the tank top mold of this utility model;

[0020] Figure 3 This is an assembly drawing of the tank bottom mold of this utility model;

[0021] Figure 4 This is a schematic diagram of the steel core at the bottom of the tank according to this utility model;

[0022] In the diagram: 1 is the top mold unit, 101 is the top mold body, 102 is the top steel core, 103 is the top sand coating, 104 is the cantilever machine shaft end flange, 105 is the pouring pipe, 106 is the top conical pin, 107 is the top connecting bolt group, 2 is the middle reduction tank body, 3 is the bottom mold unit, 301 is the bottom mold body, 302 is the bottom steel core, 303 is the bottom sand coating, 304 is the conical sand core, 305 is the straight sand core, 306 is the conical sand core plug, 307 is the straight sand core plug, and 308 is the bottom connecting bolt group. Detailed Implementation

[0023] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0025] like Figures 1 to 4 As shown, a casting mold for a magnesium reduction tank with upper and lower conical sections includes a top mold unit 1, a middle reduction tank body 2, and a bottom mold unit 3. The top mold unit 1 includes a top mold body 101, a top steel core 102, and a top sand coating layer 103. The bottom mold unit 3 includes a bottom mold body 301, a bottom steel core 302, a bottom sand coating layer 303, a conical sand core 304, a straight sand core 305, a conical sand core blocking plate 306, and a straight sand core blocking plate 307. The top mold unit 1 is located at the front of the middle reduction tank body 2, and the bottom mold unit 3 is located at the rear. The top steel core 102 is located inside the top mold body 101, and the top sand coating layer 103 is located between the top mold body 101 and the top steel core 102. The bottom steel core 302 is located at the rear of the middle reduction tank body 2. Inside the bottom mold body 301, the bottom sand layer 303 is set between the bottom mold body 301 and the bottom steel core 302. The conical sand core 304 is set to fit against the bottom steel core 302. The straight sand core 305 is set to be coaxially aligned with the central axis of the conical sand core 304. The conical sand core blocking plate 306 is set to fit against the conical sand core 304. The straight sand core blocking plate 307 is set to fit against the straight sand core 305. First, the top steel core 102 is installed into the top mold body 101 and the bottom steel core 302 is installed into the bottom mold body 301. Then, the conical sand core 304 is fitted and assembled with the bottom steel core 302. The straight sand core 305 and the conical sand core 304 are kept coaxially aligned. The conical sand core blocking plate 306 and the straight sand core blocking plate 307 are respectively fitted tightly to the corresponding sand cores to complete the nested assembly of the mold body.

[0026] Preferably, the top mold unit 1 further includes a cantilever machine shaft end flange 104, a gating pipe 105, and a top conical pin 106. The cantilever machine shaft end flange 104 is located on the upper outer side of the top mold body 101. The gating pipe 105 passes through the cantilever machine shaft end flange 104 and the top mold body 101 and is connected to the casting cavity. The top conical pin 106 is located on the mating surface between the cantilever machine shaft end flange 104 and the top mold body 101 to achieve precise positioning of the two. The cantilever machine shaft end flange 104 is mated to the upper outer side of the top mold body 101, and the top conical pin 106 is inserted into the mating surface for positioning and error prevention. Then, the gating pipe 105 is inserted along the axis into the flange and the mold body to ensure that the lower end of the gating pipe 105 is connected to the cavity and the upper end is used for pouring molten steel.

[0027] Preferably, the top mold unit 1 further includes a top connecting bolt group 107, and the bottom mold unit 3 further includes a bottom connecting bolt group 308. The top connecting bolt group 107 is used to connect the cantilever machine shaft end flange 104 to the top mold body 101, and the bottom connecting bolt group 308 is used to connect the conical sand core blocking plate 306 to the bottom mold body 301. The bottom connecting bolt group 308 is used to connect the straight sand core blocking plate 307 to the bottom mold body 301. The top connecting bolt group 107 is used to lock and fix the cantilever machine shaft end flange 104 to the top mold body 101, and the bottom connecting bolt group 308 is used to lock the conical sand core blocking plate 306 and the straight sand core blocking plate 307 to the bottom mold body 301 respectively, to ensure that they do not loosen or shift during casting.

[0028] Preferably, the top steel core 102 is a long conical section structure, and the bottom steel core 302 is a short conical section structure. The upper cone is formed using the long conical section of the top steel core 102, which completely forms the internal conical surface of the upper cone. The lower cone is formed using the short conical section of the bottom steel core 302, which only forms the small conical surface of the upper section of the lower cone and provides a coaxial assembly reference for the cone core 304.

[0029] Preferably, both the top sand layer 103 and the bottom sand layer 303 are high-temperature resistant sand layers, which isolate the molten metal from the metal surface of the mold and ensure the surface forming quality of the casting. A set thickness of high-temperature resistant resin sand is evenly applied between the top steel core 102 and the top mold body 101, and between the bottom steel core 302 and the bottom mold body 301, to form the top sand layer 103 and the bottom sand layer 303. High-temperature resistant coating is then sprayed to prevent the molten steel from directly contacting the metal mold surface.

[0030] Preferably, both the top mold body 101 and the bottom mold body 301 are forged structures without forging defects. After rough machining, the top mold body 101 and the bottom mold body 301 are subjected to quenching and tempering treatment. Both the top mold body 101 and the bottom mold body 301 are subjected to ultrasonic flaw detection before and after heat treatment, and there are no equivalent defects. The top mold body 101 and the bottom mold body 301 are forged from forged blanks and subjected to quenching and tempering heat treatment after rough machining. Ultrasonic flaw detection is performed before and after quenching and tempering to ensure that there are no defects such as cracks and porosity, and to meet the strength requirements of centrifugal casting.

[0031] Preferably, both the top steel core 102 and the bottom steel core 302 are forged structures without forging defects. After rough machining, the top steel core 102 and the bottom steel core 302 undergo quenching and tempering treatment. Both the top steel core 102 and the bottom steel core 302 are subjected to ultrasonic flaw detection before and after heat treatment, and no equivalent defects are found. The top steel core 102 and the bottom steel core 302 are forged from forged billets and subjected to quenching and tempering heat treatment after rough machining. Ultrasonic flaw detection is performed before and after quenching and tempering to ensure that there are no internal defects and to guarantee dimensional accuracy and structural stability.

[0032] First, prepare the inner core iron shell by sanding. Place the top steel core 102 and the bottom steel core 302 inside the special sanding mold. Apply a 10 mm thick layer of resin sand evenly to the outer surface of the top steel core 102 and the bottom steel core 302 to form the top sanding layer 103 and the bottom sanding layer 303. Fix the sanded top steel core 102 and the bottom steel core 302 to the corresponding inner core molds. Spray high-temperature resistant coating on the surface of the top sanding layer 103 and the bottom sanding layer 303. Let them stand and wait for the mold to be assembled.

[0033] The main mold inner wall sand shooting operation is carried out. The top mold body 101 and the bottom mold body 301 are heated to 220 degrees Celsius. The corresponding built-in sub-molds are respectively inserted into the top mold body 101 and the bottom mold body 301. Resin sand is injected into the inner wall of the top mold body 101 and the bottom mold body 301 using sand shooting equipment. The sand shooting thickness is controlled to be 4 mm. After the resin sand is completely cured, the built-in sub-molds are removed. High temperature resistant coating is sprayed on the sand layer surface of the inner wall of the top mold body 101 and the bottom mold body 301 to complete the pretreatment of the main mold. The mold assembly operation is carried out. The sand-coated top steel core 102 is coaxially assembled into the inside of the top mold body 101, so that the sand-coated layer 103 fills the space between the top mold body 101 and the top steel core 102. The sand-coated bottom steel core 302 is coaxially assembled into the inside of the bottom mold body 301, so that the sand-coated layer 303 fills the space between the bottom mold body 301 and the bottom steel core 302. The conical sand core 304 is coaxially fitted and installed below the bottom steel core 302. The straight sand core 305 is coaxially positioned directly below the conical sand core 304, keeping the central axes of the conical sand core 304 and the straight sand core 305 aligned. After completing the mold end positioning and sealing assembly, the conical sand core plug 306 is fitted and installed on the lower outer side of the conical sand core 304. The conical sand core plug 306 is then fastened to the bottom mold body 301 of the tank through the bottom connecting bolt group 308, thereby achieving axial limiting of the conical sand core 304. The straight sand core plug 307 is fitted and installed on the lower end of the straight sand core 305. The straight sand core plug 307 is then fastened to the bottom mold body 301 of the tank through the bottom connecting bolt group 308, thereby achieving mold end sealing and axial limiting of the straight sand core 305.

[0034] After completing the assembly of the tank top mold unit, install the cantilever machine shaft end flange 104 on the upper outer side of the tank top mold body 101. Insert the tank top tapered pin 106 into the mating surface of the cantilever machine shaft end flange 104 and the tank top mold body 101 to achieve precise positioning of the two. Secure the cantilever machine shaft end flange 104 and the tank top mold body 101 together with the tank top connecting bolt group 107. Pass the gating pipe 105 through the cantilever machine shaft end flange 104 and the tank top mold body 101 along the central axis to ensure stable communication between the gating pipe 105 and the internal casting cavity.

[0035] Start the centrifugal casting equipment. As a whole, install the assembled top mold unit 1, middle reduction tank 2, and bottom mold unit 3 onto the centrifuge. After checking that all components are securely connected, start the centrifuge and put it into operation. Perform the molten steel pouring operation. Molten steel that has been pre-melted and impurities removed is injected into the mold casting cavity through the pouring pipe 105 at a uniform speed within 30 seconds. Control the centrifuge speed to maintain 520 revolutions per minute and continue centrifugal casting for 3 minutes, so that the molten steel fills the cavity evenly under centrifugal action and solidifies rapidly.

[0036] After the centrifugal casting is completed, the centrifuge is gradually decelerated until it stops completely. First, the bottom connecting bolt group 308 is removed, and then the straight sand core plug 307 and the conical sand core plug 306 are removed in sequence. Next, the top connecting bolt group 107 is removed, and the cantilever machine shaft end flange 104 and the gating pipe 105 are removed. The top steel core 102, the bottom steel core 302, the conical sand core 304 and the straight sand core 305 are removed from the mold in sequence. Finally, the formed upper and lower conical workpieces of the magnesium reduction tank are removed from the top mold body 101 and the bottom mold body 301, completing one complete workpiece casting process.

[0037] The above description only details the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model, and all such changes should be included within the protection scope of the present utility model.

Claims

1. A metal magnesium reduction pot upper and lower cone casting mold characterized by: The system includes a top mold unit (1), a middle reduction tank (2), and a bottom mold unit (3). The top mold unit (1) includes a top mold body (101), a top steel core (102), and a top sand coating layer (103). The bottom mold unit (3) includes a bottom mold body (301), a bottom steel core (302), a bottom sand coating layer (303), a conical sand core (304), a straight sand core (305), a conical sand core plug (306), and a straight sand core plug (307). The top mold unit (1) is located at the front of the middle reduction tank (2), and the bottom mold unit (3) is located at the rear. The top steel core (102) is located on the top mold body (101). 101) Inside, the top sand layer (103) is disposed between the top mold body (101) and the top steel core (102), the bottom steel core (302) is disposed inside the bottom mold body (301), the bottom sand layer (303) is disposed between the bottom mold body (301) and the bottom steel core (302), the conical sand core (304) is disposed in close contact with the bottom steel core (302), the straight sand core (305) is disposed coaxially with the central axis of the conical sand core (304), the conical sand core blocking plate (306) is disposed in close contact with the conical sand core (304), and the straight sand core blocking plate (307) is disposed in close contact with the straight sand core (305).

2. A metal magnesium reduction pot upper and lower cone casting mold according to claim 1, characterized in that: The tank top mold unit (1) also includes a cantilever machine shaft end flange (104), a gating pipe (105), and a tank top cone pin (106). The cantilever machine shaft end flange (104) is located on the upper outer side of the tank top mold body (101). The gating pipe (105) passes through the cantilever machine shaft end flange (104) and the tank top mold body (101) and is connected to the casting cavity. The tank top cone pin (106) is located on the mating connection surface of the cantilever machine shaft end flange (104) and the tank top mold body (101) to achieve precise positioning of the two.

3. The upper and lower cone casting mold for a magnesium reduction vessel according to claim 2, characterized in that: The top mold unit (1) further includes a top connecting bolt group (107), and the bottom mold unit (3) further includes a bottom connecting bolt group (308). The top connecting bolt group (107) is used to connect the cantilever machine shaft end flange (104) to the top mold body (101). The bottom connecting bolt group (308) is used to connect the conical sand core plug (306) to the bottom mold body (301). The bottom connecting bolt group (308) is used to connect the straight sand core plug (307) to the bottom mold body (301).

4. The upper and lower cone casting mold for a magnesium reduction vessel according to claim 1, characterized in that: The top steel core (102) of the tank has a long conical section structure, and the bottom steel core (302) of the tank has a short conical section structure.

5. The upper and lower cone casting mold for a magnesium reduction vessel according to claim 1, characterized in that: The top sand layer (103) and bottom sand layer (303) are both high-temperature resistant sand layers, which isolate the molten metal from the metal surface of the mold and ensure the surface forming quality of the casting.

6. The upper and lower cone casting mold for a magnesium reduction vessel according to claim 1, characterized in that: The top mold body (101) and the bottom mold body (301) are both forged structures without forging defects. The top mold body (101) and the bottom mold body (301) are subjected to quenching and tempering after rough machining. The top mold body (101) and the bottom mold body (301) are subjected to ultrasonic flaw detection before and after heat treatment, and there are no equivalent defects.

7. The upper and lower cone casting mold for a magnesium reduction vessel according to claim 1, characterized in that: The top steel core (102) and bottom steel core (302) of the tank are both forged structures without forging defects. The top steel core (102) and bottom steel core (302) are subjected to quenching and tempering treatment after rough machining. The top steel core (102) and bottom steel core (302) are subjected to ultrasonic flaw detection before and after heat treatment, and there are no equivalent defects.

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