High-pressure casing casting device

Abstract

The invention relates to the technical field of machine shell die-casting devices, and discloses a machine shell high-pressure casting device which comprises a die-casting unit, a cooling unit and an exhaust unit, the die-casting unit comprises a die-casting die used for conducting die-casting on a shell, a plurality of pouring openings are formed in the die-casting die, and the pouring openings are used for filling the die-casting die with raw materials; the cooling unit comprises a plurality of cooling pipes, the multiple cooling pipes are evenly distributed around the die-casting die, the cooling pipes are filled with cooling liquid in a flowing mode, and the cooling pipes are used for cooling the die-casting unit; the exhaust unit comprises a first exhaust pipe and a second exhaust pipe, one end of the first exhaust pipe and one end of the second exhaust pipe are connected with the side, away from the pouring opening, of the die-casting die, the other end of the first exhaust pipe and the other end of the second exhaust pipe are connected with a pressure maintaining device, and the pressure maintaining device is used for maintaining the pressure in the first exhaust pipe and the pressure in the second exhaust pipe. The die-casting die has the beneficial effect of being good in die-casting product quality.

Description

Technical Field

[0001] The invention relates to the technical field of casing die-casting devices, and in particular to a casing high-pressure casting device. Background Art

[0002] In the production of some metal parts in the shape of shells, in order to ensure the accuracy of the shell parts and the uniformity of the structure of each area of ​​the shell parts, the high-temperature die casting (HPDC) method is usually used to produce the shell parts by injecting molten metal or metal alloy into the mold at high speed and high pressure, so that the molten metal or alloy is cooled and solidified in the corresponding mold, so that the shell parts can be produced and manufactured quickly and in large quantities. When the parts are produced by high-temperature die casting, the parts are usually die-casted by the corresponding high-temperature die casting device.

[0003] For example, a patent document with the announcement number CN221620810U discloses a high-temperature alloy casting device, which includes: a lower mold mechanism, a cooling mechanism, a lifting mechanism and an upper mold mechanism. The lower mold mechanism includes a base, a lower mold, a molding cavity, a cooling cavity and a support plate. The lower mold is arranged on the top of the base, and a molding cavity is opened at the top center of the lower mold. A cooling cavity is arranged outside the molding cavity, and support plates are arranged at the bottom of the front and rear sides of the lower mold; the cooling mechanism is arranged on the base, and the cooling mechanism includes a coolant tank, a circulation pipeline, a circulation pump and a refrigeration component. The circulation pipeline is connected between the coolant tank and the cooling cavity. The circulation pump draws the coolant into the cooling cavity for circulation, so that the coolant is fully in contact with the outer wall of the molding cavity, and the top of the cooling cavity is exposed, which is convenient for the coolant to cool and dissipate heat naturally, improve the cooling effect, accelerate the cooling and molding of the alloy, and improve the work efficiency.

[0004] Although the above technical solution can reduce the possibility of oxidation during high-pressure casting and achieve near-net-shape casting of parts; however, during high-pressure casting, due to the high temperature of the molten metal or non-metal material, the poured material needs to be cooled during the die-casting process to enable the parts to be quickly cooled and formed. When cooling, the above technical solution only cools the mold through the circulation pipe, resulting in the temperature of the coolant in the rear part of the circulation pipe rising when the circulation pipe circulates the coolant, resulting in a reduction in the cooling effect of some areas in the mold. And after the molten metal or non-metal material is poured into the mold, in order to ensure that there is sufficient pressure in the mold, it is usually necessary to maintain the pressure in the mold. The above technical solution cannot effectively maintain the pressure in the mold during the casting process, resulting in the quality of the die-casting product being easily affected by the pressure during die-casting. Summary of the invention

[0005] The present invention aims to provide a casing high-pressure casting device to solve the technical problems of low cooling effect in the die-casting process and poor pressure holding effect in the mold in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a high-pressure casting device for a casing, comprising a die-casting unit, a cooling unit and an exhaust unit, wherein the die-casting unit comprises a die-casting mold for die-casting a casing, wherein the die-casting mold is provided with a plurality of pouring ports, and the pouring ports are used to fill raw materials into the die-casting mold; the cooling unit comprises a plurality of cooling pipes, wherein the plurality of cooling pipes are evenly distributed around the die-casting mold, wherein the cooling pipes are filled with coolant flowing therein, and wherein the cooling pipes are used to cool the die-casting unit; the exhaust unit comprises a first exhaust pipe and a second exhaust pipe, wherein one end of the first exhaust pipe and the second exhaust pipe are connected to a side of the die-casting mold away from the pouring port, and the other end of the first exhaust pipe and the second exhaust pipe are connected to a pressure retainer, wherein the pressure retainer is used to maintain the pressure in the first exhaust pipe and the second exhaust pipe.

[0007] The principle and advantage of this scheme are: when die-casting the housing, the molten metal or alloy liquid raw material is filled into the die-casting mold through the feed pipe, the metal or alloy raw material is filled into the die-casting mold, and under the cooling effect of the cooling unit, it is cooled and solidified to obtain a solid housing. When the metal or alloy raw material is filled into the die-casting mold, the gas and impurities in the die-casting mold are discharged through the exhaust unit, and the pressure retainer in the exhaust unit maintains the pressure in the die-casting mold during the die-casting process.

[0008] In this solution, multiple cooling pipes are arranged in the cooling unit to cool the die-casting mold, so that during the die-casting process, it can be cooled and solidified quickly, improving the effect of the die-casting casing, and multiple cooling pipes can be used to perform fixed-point cooling on multiple areas of the die-casting mold to ensure the uniformity of the cooling effect of each area of ​​the die-casting mold. In addition, by arranging a pressure retainer in the exhaust unit, the exhaust unit can prevent the pressure in the die-casting mold from dropping rapidly while discharging the gas in the die-casting mold, ensuring that the pressure in the die-casting mold during the die-casting process can meet the production requirements of the product, and improving the quality of the die-casting product.

[0009] Preferably, as an improvement, the pouring ports are evenly distributed at the top of the die-casting mold along the circumference of the casting mold, and the distribution range of the pouring ports at the top of the casting mold is greater than 50% of the circumference of the top of the casting mold. When the raw material is filled into the die-casting mold, the raw material can be filled from a larger range of the top of the die-casting mold, and the pressure in the die-casting mold can be further increased when the die-casting mold is die-casting the casing, thereby avoiding insufficient pressure in the die-casting mold, resulting in gaps such as pores on the casing after die-casting, and reducing the air tightness of the die-casting casing.

[0010] Preferably, as an improvement, an input port and an output port are provided at one end of the cooling tube away from the die-casting mold, wherein the input port is used to input the coolant into the cooling tube; and the output port is used to output the coolant in the cooling tube. By independently inputting and outputting the coolant in each cooling tube, more coolants can be used to absorb the heat in the die-casting mold at the same time, thereby ensuring the cooling speed during the die-casting process while avoiding multiple recycling of the coolant near the die-casting mold, ensuring the uniformity of the coolant temperature in the cooling tubes of each area of ​​the die-casting mold, ensuring the consistency of the cooling effect of each area of ​​the die-casting mold, and avoiding the temperature difference between each area of ​​the die-casting mold during the cooling process, which affects the structural performance of the die-casting product.

[0011] Preferably, as an improvement, the distance between the cooling pipe and the die-casting mold is 15-30 mm. This allows the cooling pipe to be closer to the die-casting mold, ensuring the cooling effect of the cooling pipe on the die-casting mold while avoiding the distance between the cooling pipe and the die-casting mold being too close. This results in a reduction in the wall thickness at the connection position between the die-casting mold and the cooling pipe, causing the die-casting mold to be easily broken or damaged under the action of pressure during the die-casting process, thus affecting the service life of the die-casting mold.

[0012] Preferably, as an improvement, the first exhaust pipe is located at the bottom of the die-casting mold, and there are multiple first exhaust pipes, and the multiple first exhaust pipes are distributed around the circumference of the die-casting mold near one end of the die-casting mold, so that the circumference of the bottom of the die-casting mold can be exhausted through the first exhaust pipe, reducing the closed area in the die-casting mold and ensuring the uniformity of the distribution of the raw materials in the die-casting mold.

[0013] Preferably, as an improvement, the second exhaust pipe is located at the top of the die-casting mold on a side away from the feed pipe, so that when the raw material is poured downward from the top of the die-casting mold, after the raw material is filled in the die-casting mold from bottom to top, the residual gas in the top of the die-casting mold can be discharged from the second exhaust pipe, ensuring the balance of the air pressure in the die-casting mold, avoiding the residual gas in the die-casting mold causing bubbles and cavities in the die-casting housing, and ensuring the integrity of the die-casting housing.

[0014] Preferably, as an improvement, the pressure retainer includes a pressure retaining tube, one end of the pressure retaining tube is connected to an end of the first exhaust pipe or the second exhaust pipe away from the die-casting mold, and the other end extends in a direction away from the first exhaust pipe or the second exhaust pipe; an opening is provided at one end of the pressure retaining tube away from the first exhaust pipe and the second exhaust pipe, and the opening is used to discharge gas in the first exhaust pipe and the second exhaust pipe.

[0015] Preferably, as an improvement, a wave section is provided on the upper edge of the pressure-maintaining tube in the self-extending direction, and the wave section extends reciprocatingly up and down in the height direction. When the pressure-maintaining tube discharges gas, the gas in the pressure-maintaining tube can slowly move toward the open end under the obstruction of the wave section, so that the pressure in the die-casting mold can be maintained during the slow exhaust process during the die-casting process, ensuring that the die-casting mold can have a sufficient pressure value during the die-casting process; avoiding the exhaust unit from venting too quickly during the exhaust process, resulting in an increase in the pressure release rate during the exhaust process, affecting the pressure stability in the die-casting mold during the die-casting process.

[0016] Preferably, as an improvement, the aperture of the pressure-maintaining tube gradually decreases in the direction away from the first exhaust pipe or the second exhaust pipe, so that the pressure-maintaining tube can smoothly discharge the gas in the die-casting mold during the exhaust process, and ensure that after the pressure-maintaining tube releases gas near the opening end, the opening size in the pressure-maintaining tube is reduced to compensate for the pressure released in the pressure-maintaining tube, thereby ensuring the stability of the pressure value in the pressure-maintaining tube and improving the pressure-maintaining effect of the pressure-maintaining tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the high pressure casting device of the casing in an embodiment of the present invention.

[0018] Figure 2 It is a schematic diagram of the top view of the high pressure casting device for the casing in an embodiment of the present invention.

[0019] Figure 3 It is a bottom view structural diagram of the casing high pressure casting device in an embodiment of the present invention.

[0020] Figure 4 It is an exploded view of the pressure retainer structure in an embodiment of the present invention.

[0021] Figure 5 Schematic diagram of the pressure-maintaining tube structure in an embodiment of the present invention.

[0022] Figure 6 Schematic diagram of the cross-sectional structure of the pressure-maintaining tube in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following is further described in detail through specific implementation methods:

[0024] The figure marks in the drawings of the specification include: die-casting unit 1, die-casting mold 101, feed pipe 102, cooling unit 2, cooling pipe 201, input port 202, output port 203, exhaust unit 3, first exhaust pipe 301, second exhaust pipe 302, pressure retainer 303, shell 304, pressure retaining pipe 305.

[0025] As attached Figure 1As shown, a casing high-pressure casting device includes a die-casting unit 1, a cooling unit 2 and an exhaust unit 3. The die-casting unit 1 is used to die-cast the casing 304 parts, the cooling unit 2 is used to cool and mold the parts in the die-casting unit 1, and the exhaust unit 3 is used to discharge the waste gas and impurities in the die-casting unit 1 during the die-casting process.

[0026] The die casting unit 1 comprises a die casting mold 101, wherein a pouring cavity for pouring metal material is provided in the die casting mold 101. The specific structure of the die casting mold 101 is designed according to the structure of the specific die casting housing 304, wherein the specific structure of the die casting mold 101 is prior art and will not be described in detail here.

[0027] A plurality of pouring ports are provided at the top of the die-casting mold 101, and the plurality of pouring ports are evenly distributed on one side of the top of the die-casting mold 101. A feed pipe 102 is connected to the pouring port, one end of the feed pipe 102 is connected to the raw material conveying mechanism, and the other end of the feed pipe 102 extends to the side of the top of the die-casting mold 101 where the pouring port is provided, and the feed pipe 102 surrounds the side of the die-casting mold 101 where the pouring port is provided, and the feed pipe 102 is connected to the pouring port on the die-casting mold 101 through a feed branch pipe. The feed pipe 102 is used to convey high-pressure raw materials into the die-casting mold 101. By filling the raw materials into the die-casting mold 101 from one side of the top of the die-casting mold 101, the raw materials can be quickly and evenly filled into the die-casting mold 101, ensuring that the raw materials can be tightly filled into the die-casting mold 101, avoiding the presence of bubbles in the die-casting mold 101, resulting in defects in the die-casting product.

[0028] As attached Figure 2 As shown, the pouring ports are evenly distributed along the circumference of the casting mold at the top of the die-casting mold 101, and the distribution range of the pouring ports at the top of the casting mold is greater than 50% of the circumference of the top of the casting mold; specifically, in this embodiment, the top of the die-casting mold 101 is annular, and the coverage angle of the pouring ports at the top of the die-casting mold 101 is 270°. In addition, the feed pipe 102 is provided with a fork on one side of the die-casting mold 101, and the fork of the feed pipe 102 is located in the middle of multiple pouring ports, and the feed pipe 102 extends evenly to both sides of the die-casting mold 101. When the raw material is filled into the die-casting mold 101, the raw material can be filled from a larger range of the top of the die-casting mold 101, and the pressure in the die-casting mold 101 can be further increased when the die-casting mold 101 is die-casting the housing, so as to avoid insufficient pressure in the die-casting mold 101, resulting in gaps such as pores on the housing after die-casting, resulting in reduced air tightness of the die-casting housing.

[0029] The cooling unit 2 includes a plurality of cooling tubes 201, which are all located in the inner ring of the die-casting mold 101, and are evenly distributed along the circumference of the die-casting mold 101, with one end of the cooling tube 201 extending into the die-casting, and the other end extending outward along the central axis direction of the die-casting mold 101. The die-casting mold 101 is cooled and cooled simultaneously by the plurality of cooling tubes 201, so that each area of ​​the die-casting mold 101 can be cooled and cooled independently by one cooling tube 201, thereby avoiding the need for the coolant to absorb heat from multiple locations of the die-casting mold 101, resulting in an increase in the temperature of the cooling liquid at the rear end of the cooling tube 201, and causing some areas of the die-casting mold 101 to be prone to low cooling efficiency.

[0030] An input port 202 and an output port 203 are respectively provided at one end of the cooling tube 201 away from the die-casting mold 101. The input port 202 is connected to the coolant delivery pipe, and the input port 202 is used to input the coolant into the cooling tube 201; the output port 203 is connected to the coolant recovery pipe, and the output port 203 is used to output the coolant in the cooling tube 201. Specifically, a cooling cavity extending from the input port 202 to the output port 203 is provided in the cooling tube 201, and the cooling cavity is filled with coolant to cool the die-casting mold 101. The specific structure of the coolant filled in the cooling tube 201 is prior art and will not be described in detail here. By independently inputting and outputting the coolant in each cooling tube 201, more coolant can be used to absorb the heat in the die-casting mold 101 at the same time, ensuring the cooling speed during the die-casting process while avoiding multiple circulation of the coolant near the die-casting mold 101, ensuring the uniformity of the coolant temperature in the cooling tubes 201 in each area of ​​the die-casting mold 101, ensuring the consistency of the cooling effect in each area of ​​the die-casting mold 101, and avoiding temperature differences in each area of ​​the die-casting mold 101 during the cooling process, which affects the structural performance of the die-casting product.

[0031] The spacing between the cooling tube 201 and the inner wall of the die-casting mold 101 is 15-30 mm, and preferably in the present embodiment the spacing between the cooling tube 201 and the die-casting mold 101 is 25 mm. This allows the cooling tube 201 to be closer to the die-casting mold 101, ensuring the cooling effect of the cooling tube 201 on the die-casting mold 101, while preventing the spacing between the cooling tube 201 and the die-casting mold 101 from being too close, resulting in a reduction in the wall thickness at the connection position between the die-casting mold 101 and the cooling tube 201, causing the die-casting mold 101 to be easily broken or damaged under the action of pressure during the die-casting process, thereby affecting the service life of the die-casting mold 101.

[0032] As attached Figure 2 With attached Figure 3As shown, the exhaust unit 3 includes a first exhaust pipe 301 and a second exhaust pipe 302. The first exhaust pipe 301 is located at the bottom of the die-casting mold 101, wherein there are multiple first exhaust pipes 301, one end of the multiple first exhaust pipes 301 is arranged side by side at the bottom of the die-casting mold 101, and one end of the two first exhaust pipes 301 close to the die-casting mold 101 is arranged around the circumference of the die-casting mold 101; the second exhaust pipe 302 is located at the top of the die-casting mold 101, specifically, the second exhaust pipe 302 is located at the side of the top of the die-casting mold 101 away from the feed pipe 102. Multiple exhaust ports are opened at the bottom of the die-casting mold 101 and at the corresponding positions of the bottom and the first exhaust pipe 301 or the second exhaust pipe 302, and the multiple exhaust ports are evenly distributed on the die-casting mold 101, and the first exhaust pipe 301 and the second exhaust pipe 302 are connected to the exhaust ports through the exhaust branch pipe. This allows exhaust to be performed while feeding at the top of the die-casting mold 101 away from the feeding pipe 102 and the bottom of the die-casting mold 101, thereby avoiding the formation of closed areas in the die-casting mold 101 away from the feeding pipe 102, resulting in the inability to discharge the gas in these areas in a timely and effective manner during the feeding process, resulting in the inability to fully fill the raw material in the die-casting mold 101, affecting the integrity and completeness of the die-cast product.

[0033] One end of the first exhaust pipe 301 and the second exhaust pipe 302 is located on one side of the die-casting mold 101, and the other end extends outward in a direction away from the die-casting mold 101, wherein a pressure retainer 303 is provided at one end of the first exhaust pipe 301 and the second exhaust pipe 302 away from the die-casting mold 101, and the pressure retainer 303 is used to maintain the pressure in the first exhaust pipe 301 and the second exhaust pipe 302.

[0034] As attached Figure 4 With attached Figure 5As shown, the pressure retainer 303 includes a shell 304, and a pressure retaining tube 305 is arranged in the shell 304. One end of the pressure retaining tube 305 is connected to one end of the first exhaust pipe 301 or the second exhaust pipe 302 away from the die-casting mold 101, and the other end extends in a direction away from the first exhaust pipe 301 or the second exhaust pipe 302. A wave section is arranged on the pressure retaining tube 305 along the self-extending direction, and the wave section has a plurality of corrugated concave-convex portions extending up and down along the height direction, and the plurality of corrugated concave-convex portions are arranged side by side along the extending direction of the pressure retaining tube 305; an opening is provided at one end of the pressure retaining tube 305 away from the first exhaust pipe 301 and the second exhaust pipe 302, and the opening is used to discharge the gas transported into the pressure retaining tube 305 by the first exhaust pipe 301 and the second exhaust pipe 302. When the pressure-maintaining tube 305 discharges the gas, the gas in the pressure-maintaining tube 305 can slowly move toward the open end under the obstruction of the wave section, so that the pressure in the die-casting mold 101 can be maintained during the slow exhaust process during the die-casting process, ensuring that the die-casting mold 101 can have a sufficient pressure value during the die-casting process; avoid the exhaust unit 3 from exhausting too quickly during the exhaust process, resulting in an increase in the pressure release rate during the exhaust process, affecting the pressure stability in the die-casting mold 101 during the die-casting process.

[0035] As attached Figure 6 As shown, the aperture of the pressure-maintaining tube 305 gradually decreases in the direction away from the first exhaust pipe 301 or the second exhaust pipe 302. In the exhaust process, the pressure-maintaining tube 305 can smoothly discharge the gas in the die-casting mold 101, and ensure that after the pressure-maintaining tube 305 near the opening end releases the gas, the opening size in the pressure-maintaining tube 305 is reduced to compensate for the pressure released in the pressure-maintaining tube 305, ensure the stability of the pressure value in the pressure-maintaining tube 305, and improve the pressure-maintaining effect of the pressure-maintaining tube 305.

[0036] The specific implementation process is as follows:

[0037] When die-casting the housing, a molten metal or alloy liquid raw material is filled into the die-casting mold 101 through the feed pipe 102. The metal or alloy raw material is filled into the die-casting mold 101 and is cooled and solidified under the cooling effect of the cooling unit 2 to obtain a solid housing. When the metal or alloy raw material is filled into the die-casting mold 101, the gas and impurities in the die-casting mold 101 are discharged through the exhaust unit 3, and the pressure retainer 303 in the exhaust unit 3 maintains the pressure in the die-casting mold 101 during the die-casting process.

[0038] Compared with the prior art, in this solution, multiple cooling pipes 201 are provided in the cooling unit 2 to cool the die-casting mold 101, so that during the die-casting process, it can be quickly cooled and solidified, improving the effect of the die-casting casing, and multiple cooling pipes 201 can be used to perform fixed-point cooling on multiple areas of the die-casting mold 101 to ensure the uniformity of the cooling effect of each area of ​​the die-casting mold 101. In addition, by providing a pressure retainer 303 in the exhaust unit 3, the exhaust unit 3 can prevent the pressure in the die-casting mold 101 from decreasing rapidly while discharging the gas in the die-casting mold 101, ensuring that the pressure in the die-casting mold 101 during the die-casting process can meet the production requirements of the product, thereby improving the quality of the die-casting product.

[0039] It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the technical solution of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A casing high pressure casting device, characterized in that: The invention comprises a die-casting unit, a cooling unit and an exhaust unit, wherein the die-casting unit comprises a die-casting mold for die-casting a shell, wherein the die-casting mold is provided with a plurality of pouring ports, and wherein the pouring ports are used to fill the die-casting mold with raw materials; the cooling unit comprises a plurality of cooling pipes, wherein the plurality of cooling pipes are evenly distributed around the die-casting mold, wherein the cooling pipes are filled with coolant flowing therein, and wherein the cooling pipes are used to cool the die-casting unit; the exhaust unit comprises a first exhaust pipe and a second exhaust pipe, wherein one end of the first exhaust pipe and the second exhaust pipe are connected to a side of the die-casting mold away from the pouring port, and the other end of the first exhaust pipe and the second exhaust pipe are connected to a pressure retainer, wherein the pressure retainer is used to maintain the pressure in the first exhaust pipe and the second exhaust pipe.

2. A casing high pressure casting device according to claim 1, characterized in that: The pouring ports are evenly distributed at the top of the die-casting mold along the circumference of the casting mold. The distribution range of the pouring ports at the top of the casting mold is greater than 50% of the circumference of the top of the casting mold.

3. A casing high pressure casting device according to claim 1, characterized in that: An input port and an output port are provided at one end of the cooling tube away from the die-casting mold. The input port is used to input the coolant into the cooling tube; and the output port is used to output the coolant in the cooling tube.

4. A casing high pressure casting device according to claim 3, characterized in that: The distance between the cooling pipe and the die-casting mold is 15-30 mm.

5. The high pressure casting device for a casing according to claim 1, characterized in that: The first exhaust pipe is located at the bottom of the die-casting mold. There are a plurality of the first exhaust pipes, and the plurality of first exhaust pipes are distributed around the circumference of the die-casting mold close to one end of the die-casting mold.

6. A casing high pressure casting device according to claim 5, characterized in that: The second exhaust pipe is located at a side of the top of the die-casting mold away from the feed pipe.

7. The high pressure casting device for a casing according to claim 1, characterized in that: The pressure retainer includes a pressure retaining tube, one end of which is connected to an end of the first exhaust pipe or the second exhaust pipe away from the die-casting mold, and the other end of which extends in a direction away from the first exhaust pipe or the second exhaust pipe; an opening is formed at one end of the pressure retaining tube away from the first exhaust pipe and the second exhaust pipe, and the opening is used to discharge gas in the first exhaust pipe and the second exhaust pipe.

8. A casing high pressure casting device according to claim 7, characterized in that: The pressure-maintaining tube is provided with a wave section along the extension direction, and the wave section reciprocates up and down along the height direction.

9. A casing high pressure casting device according to claim 8, characterized in that: The aperture of the pressure-maintaining pipe gradually decreases in a direction away from the first exhaust pipe or the second exhaust pipe.

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