Design method of centrifugal casting pouring system of Tesla valve structure

Abstract

The invention provides a design method of a centrifugal casting pouring system of a Tesla valve structure, which comprises the following steps of: calculating the maximum hot spot size of an annular complex thin-wall casting by adopting a thermal modulus method, and constructing a Tesla valve type riser; a sprue gate, a sprue and a sprue nest are designed according to the maximum hot spot size; the casting system of the Tesla valve structure corresponding to the casting is formed by connecting the Tesla valve type riser, the sprue, the sprue and the sprue socket with the casting. By means of the characteristic that the Tesla valve casting system is used for controlling one-way flowing of the melt, it can be guaranteed that the high-temperature alloy melt is not thrown out of the casting, feeding is continuously conducted on the annular complex thin-wall casting, the shrinkage cavity and shrinkage porosity forming tendency can be greatly reduced, and the technological yield of the complex thin-wall high-temperature alloy casting can be increased.

Description

Technical Field

[0001] The present application relates to the technical field of high-temperature alloy precision casting, and in particular to a design method for a centrifugal casting rigging system of a Tesla valve structure. Background Art

[0002] Advanced aircraft engines are a core manifestation of a nation's comprehensive scientific and technological strength and a strategic advantage in the technological competition among major powers. Their hot-end components are undergoing a dual revolution in materials and structural design, resulting in a greater tendency for casting defects and increasingly complex structural designs. The traditional "form first, then weld" model is becoming unsuitable, making the development of complex, thin-walled, annular hot-end castings extremely difficult. For example, the industry currently faces the common technical challenge of achieving "zero porosity" during the molding process of high-performance, high-temperature alloy thin-walled, annular castings. This is one of the core issues that determine the successful development of advanced aircraft engines. Therefore, there is an urgent need to overcome the difficulty in controlling porosity defects in these thin-walled, annular castings.

[0003] After searching the literature on the prior art, it was found that the Chinese invention patent with application number 202210989528.0 is related to a centrifugal casting preparation method for high-temperature alloy castings. The main scheme is to assemble the centrifugal casting chamber onto an electric rotating shaft after vacuuming, melt the ingot from top to bottom, rotate the mold turntable in advance, and heat the molten metal to the set temperature before flowing into the rotating mold from the pre-opening of the crucible, so that the melt is solidified and formed under the action of centrifugation. Through reasonable centrifugal casting process design, vacuuming and smelting and pouring dual-thread flow operations can achieve rapid flow production, and the grain size of the casting is below 1mm, which improves the performance of the casting. Although this method can better solve the problem of filling thin-walled structures, high-temperature alloy castings often have more than just thin walls. They also have complex structures. The porosity defects caused by the complex structure are also one of the key control links for the success of high-temperature alloy casting research and development.

[0004] Chinese invention patent application number 202310250805.0 also relates to a centrifugal casting method for producing high-temperature alloy castings. This method proposes a centrifugal casting method for producing high-temperature alloy castings. The main scheme is that the centrifugal effect generated by mold shell rotation can improve the shrinkage feeding capacity of the molten metal, reduce the tendency to form loose defects, increase the density of the internal structure of the casting, and improve the casting quality. However, the disadvantage is that the high-temperature melt is poured in batches, which easily forms a surface oxide film, thereby increasing the risk of cold shut and reducing the mechanical properties of the interface area between different pouring times.

[0005] Chinese invention patent application number 202311566543.5 relates to a method and apparatus for forming high-temperature alloy parts. Its core technology utilizes a high-temperature centrifugal casting drive device to rotate a high-temperature mold at high speed. Under the influence of centrifugal force, liquid metal adheres to the inner surface of the contoured groove of the high-temperature centrifugal casting mold, resulting in a high-temperature alloy material with refined crystals and high lattice density. However, this method only produces thin-walled, rotary castings, and aerospace high-temperature alloy castings often have extremely complex structures and are not fully rotary parts. Summary of the Invention

[0006] In view of one of the defects in the prior art, the purpose of this application is to provide a design method for a centrifugal casting rigging system of a Tesla valve structure.

[0007] In a first aspect of the present application, a method for designing a centrifugal casting rigging system for a Tesla valve structure is provided, comprising:

[0008] The thermal modulus method is used to calculate the maximum thermal node size of annular complex thin-walled castings and construct a Tesla valve-type riser.

[0009] Designing the pouring gate, sprue and sprue pocket according to the maximum thermal node size;

[0010] The Tesla valve-type riser, the pouring gate, the sprue and the sprue nest are connected to the casting to form a Tesla valve structure pouring system corresponding to the casting.

[0011] Optionally, the method of calculating the maximum thermal node size of the annular complex thin-walled casting using a thermal modulus method and constructing a Tesla valve-type riser includes:

[0012] Obtaining dimensional information of the casting, and calculating the maximum thermal node size of the casting using the thermal modulus method;

[0013] The maximum cross-sectional dimensions of the Tesla valve are constructed based on the maximum thermal node dimensions and the set dimension range;

[0014] The maximum cross-sectional dimension of the Tesla valve is rotated around the center line to form a Tesla valve type riser.

[0015] Optionally, the obtaining of the dimension information of the casting and calculating the maximum thermal node size of the casting by the thermal modulus method includes:

[0016] Obtain the three-dimensional dimensional information of the casting, import it into the ProCAST casting simulation software, divide the mesh and set the boundary conditions, load the material thermophysical parameters calculated by JMatPro, perform solidification simulation without filling process, and use the ProCAST post-processing viewer module to view the calculation results;

[0017] By observing the temperature field distribution, find the area with relatively high temperature and slow cooling, and determine the hot spot area;

[0018] The area or volume of the heat node is estimated based on the temperature contour information of the heat node area and the area surrounded by the temperature contour, and the maximum heat node size data is determined.

[0019] Optionally, thermal insulation cotton is provided on the outside of the Tesla valve-type riser.

[0020] Optionally, the set size range is half of the maximum heat node size.

[0021] Optionally, the designing of the pouring gate, the sprue and the sprue pocket according to the maximum thermal node size includes:

[0022] Obtaining the maximum thermal node size, and designing the size of the pouring gate according to the maximum thermal node size;

[0023] Designing the size of the sprue according to the size of the pouring gate and the maximum thermal node size;

[0024] The size of the sprue cavity is designed according to the size of the sprue.

[0025] Optionally, obtaining the maximum thermal node size and designing the size of the pouring nozzle according to the maximum thermal node size includes:

[0026] Obtaining the maximum hot spot size of the casting;

[0027] According to the maximum hot spot size of the casting, half of the maximum hot spot size of the casting is used as the diameter of the pouring gate;

[0028] The length of the pouring gate is the same as the maximum hot spot size of the casting;

[0029] The pouring gate is designed by its diameter and length.

[0030] Optionally, designing the size of the sprue according to the size of the pouring gate and the maximum thermal node size includes:

[0031] Obtaining the diameter of the pouring gate and the maximum hot spot size of the casting;

[0032] Determining the diameter of the sprue according to the diameter of the pouring gate, wherein the diameter of the pouring gate is the same as the diameter of the sprue;

[0033] According to the maximum thermal zone size of the casting, one third of the maximum thermal zone size of the casting is used as the length of the sprue;

[0034] Designing the sprue according to the diameter and length of the sprue;

[0035] The sprue socket is a hemispherical structure, and its diameter is the same as that of the sprue.

[0036] Optionally, the Tesla valve riser, the pouring gate, the sprue and the sprue nest are connected to the casting to form a rigging system of a Tesla valve structure corresponding to the casting, including:

[0037] Obtaining the Tesla valve-type riser, the pouring gate, the sprue, and the sprue nest corresponding to the casting;

[0038] The pouring gate is connected to the inlet of the Tesla valve type riser, one end of the sprue is connected to the outlet of the Tesla valve type riser, the other end of the sprue is connected to one end of the casting, and the sprue nest is connected to the other end of the casting.

[0039] Optionally, the other end of the sprue is connected to one end of the casting, and when the sprue nest is connected to the other end of the casting, the sprue and the sprue nest are coaxial with the central axis of the casting;

[0040] Wherein, the end of the casting with a large diameter is arranged toward the sprue, and the end of the casting with a small diameter is arranged toward the sprue cavity.

[0041] The present application provides a design method for a centrifugal casting rigging system for a Tesla valve structure, which adopts the thermal modulus method to calculate the maximum thermal node size of the casting, designs the technical means of the Tesla valve structure rigging system, and utilizes the characteristics of the Tesla valve rigging system to control the unidirectional flow of the melt, thereby ensuring that the high-temperature alloy melt is not thrown out of the casting, continuously feeding the annular complex thin-walled casting, and significantly reducing the tendency of shrinkage cavities and shrinkage porosity to form, which is beneficial to improving the process yield of complex thin-walled high-temperature alloy castings.

[0042] Other technical effects brought about by the additional features will be further explained in the corresponding embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0044] Figure 1 This is a flow chart showing a method for designing a centrifugal casting rigging system for a Tesla valve structure according to an exemplary embodiment;

[0045] Figure 2 1 is a schematic structural diagram illustrating a Tesla valve structure rigging system according to an exemplary embodiment;

[0046] In the figure: 1, pouring gate; 2, Tesla valve type riser; 3, sprue, 4, casting; 5, sprue nest. DETAILED DESCRIPTION

[0047] The present application is described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present application, but are not intended to limit the present application in any form. It should be noted that, without departing from the concept of the present application, a number of variations and improvements may be made by those skilled in the art, and these all fall within the scope of protection of the present application. Parts not described in detail in the following examples may be implemented using existing technologies.

[0048] Conventional centrifugal casting technology for complex, thin-walled annular castings cannot guarantee that the melt will not be thrown out of the mold during the centrifugal casting process, and can also cause loose defects in the annular complex, thin-walled castings after casting. To address these issues, the present invention provides a design method for a centrifugal casting rigging system for a Tesla valve structure to address these issues.

[0049] Reference Figure 1 As shown, in one embodiment of the present application, a design method for a centrifugal casting rigging system of a Tesla valve structure includes:

[0050] S1. Calculate the maximum thermal node size of the annular complex thin-walled casting 4 using the thermal modulus method and construct a Tesla valve-type riser 2;

[0051] S2. Design the pouring gate 1, sprue 3 and sprue cavity 5 according to the maximum thermal node size;

[0052] S3. Connect the casting 4 through the Tesla valve type riser 2, the pouring gate 1, the sprue 3 and the sprue nest 5 to form a Tesla valve structure pouring and rigging system corresponding to the casting 4.

[0053] Specifically, first, the thermal modulus method is used to calculate the maximum thermal node size of the annular complex thin-walled casting 4 according to its own characteristic parameters, and the Tesla valve type riser 2 is constructed according to the maximum thermal node size; after the Tesla valve type riser 2 is constructed, the shapes and sizes of the pouring gate 1, the sprue 3 and the sprue nest 5 are designed respectively according to the maximum thermal node size calculated above; finally, the designed Tesla valve type riser 2, pouring gate 1, sprue 3 and sprue nest 5 are connected to the annular complex thin-walled casting 4 to construct a pouring and rigging system with a Tesla valve structure, forming a pouring and rigging system with a Tesla valve structure corresponding to the casting 4.

[0054] The above embodiment of the present application calculates the maximum thermal node size by adopting the thermal modulus method, which can accurately grasp the key parts of the casting 4 where heat is concentrated during the casting process, and realize the design of the Tesla valve type riser 2 for the casting 4. At the same time, the pouring gate 1, the sprue 3 and the sprue nest 5 are designed according to the maximum thermal node size, so that the molten metal can flow smoothly during the pouring process and can fill the casting 4 cavity according to the predetermined path and speed; finally, by connecting the various parts to form a Tesla valve structure pouring system, the unique flow channel structure of the Tesla valve can be used to effectively control the flow direction and speed of the molten metal, thereby realizing more accurate and efficient shrinkage compensation for the casting 4, significantly reducing the probability of loose defects in the annular complex thin-walled casting 4, and improving the overall performance and qualified rate of the casting 4.

[0055] In some specific embodiments of the present application, the maximum thermal node size of the annular complex thin-walled casting 4 is calculated using the thermal modulus method, and the Tesla valve-type riser 2 is constructed, including:

[0056] Obtain the dimensional information of the casting 4, and calculate the maximum thermal node size of the casting 4 using the thermal modulus method; construct the maximum cross-sectional size of the Tesla valve based on the maximum thermal node size and the set size range; rotate the maximum cross-sectional size of the Tesla valve around the center line to form a Tesla valve-type riser 2.

[0057] The thermal modulus is the ratio of the volume of the casting 4 to its heat dissipation area. For simple castings 4 (such as cubes and cylinders), the volume and surface area can be directly calculated using formulas. For castings 4 with complex structures, the casting simulation software ProCAST is used to analyze the casting 4 volume and the heat dissipation surface area to determine the size of the thermal node.

[0058] In the above embodiment of the present application, the maximum thermal node size of the annular complex thin-walled casting 4 is calculated by adopting the thermal modulus method, and the maximum cross-sectional size of the Tesla valve constructed based on this is more in line with the actual size of the casting 4 during the pouring process, and a better correlation is established with the casting 4. It is then rotated to form a Tesla valve-shaped riser 2, which can effectively improve the shrinkage compensation effect of the riser on the thermal node of the casting 4, reduce defects such as shrinkage cavities and shrinkage porosity of the casting 4, improve the quality and yield of the casting 4, and reduce production costs and scrap rates.

[0059] In some specific embodiments of the present application, for obtaining the size information of the casting 4, the maximum thermal node size of the casting 4 is calculated by the thermal modulus method, including:

[0060] The three-dimensional dimensional information of the casting 4 was obtained and imported into the ProCAST casting simulation software. The mesh was divided and boundary conditions were set. The material thermophysical properties calculated by JMatPro were loaded, and a solidification simulation without a filling process was performed. The calculation results were viewed using the ProCAST post-processing viewer module. By observing the temperature field distribution, the areas with relatively high temperatures and slow cooling were found to determine the hot spot area. The temperature contour line information of the hot spot area was used to estimate the area or volume of the hot spot based on the area surrounded by the temperature contour line to determine the maximum hot spot size data.

[0061] Specifically, the casting 4D image is first imported into ProCAST casting simulation software, meshed, and loaded with the material thermophysical properties calculated by JMatPro. After setting boundary conditions, a solidification simulation without mold filling is performed, and the calculation results are viewed using the ProCAST post-processing viewer module. By observing the temperature field distribution, areas with relatively high temperatures and slow cooling are identified. These areas are the locations of hot spots. The temperature contours of these hot spots are analyzed, and the area or volume of the hot spots is estimated based on the area surrounded by the temperature contours. The measurement tools provided by the software are used to obtain the relevant maximum hot spot size data.

[0062] In some specific embodiments of the present application, thermal insulation cotton is provided on the outside of the Tesla valve-type riser 2 .

[0063] Among them, the thickness of the thermal insulation cotton is 1cm.

[0064] In the above embodiment of the present application, thermal insulation cotton is provided through the Tesla valve-type riser 2 part, because this part needs to remain in a liquid state for as long as possible, and continuously provide a steady supply of shrinkage-feeding liquid for the solidification shrinkage of the casting 4 part connected to it at the lower part, so as to ensure that the casting 4 part does not have loose defects.

[0065] In this application, the riser, compared to the bottom casting 4, is designed to maintain a liquid state for as long as possible, providing a continuous supply of molten metal to the lower casting 4 to compensate for the solidification shrinkage of the lower casting 4 and prevent the occurrence of loose defects due to the lack of timely replenishment of this shrinkage. Casting 4 is usually not insulated to ensure rapid cooling, a fine grain structure, and excellent mechanical properties.

[0066] In some specific embodiments of the present application, the set size range is half of the maximum heat node size.

[0067] In the above embodiment of the present application, the basis for setting the reference size of the Tesla valve type riser 2 to half of the maximum thermal node size is that after the Tesla valve type riser 2 rotates one circle, the maximum thermal node size of the Tesla valve type riser 2 is exactly the same as the maximum thermal node size of the casting 4. The effect of superimposing the thermal insulation cotton can ensure that the thermal modulus of the Tesla valve riser is greater than the thermal modulus of the casting 4, ensuring sufficient shrinkage compensation without excess, and realizing a continuous supply of molten metal during the solidification and shrinkage process of the casting 4, ensuring that there are no loose defects in the casting 4, while not wasting molten metal due to an excessively large size of the Tesla valve riser, thereby increasing the research and development cost.

[0068] In some specific embodiments of the present application, the design of the pouring gate 1, the sprue 3 and the sprue cavity 5 according to the maximum thermal node size includes:

[0069] Obtain the maximum thermal node size and design the size of the pouring gate 1 based on the maximum thermal node size; design the size of the sprue 3 based on the size of the pouring gate 1 and the maximum thermal node size; design the size of the sprue nest 5 based on the size of the sprue 3.

[0070] In the above embodiment of the present application, the maximum thermal node size of the casting 4 is first obtained, and the size of the pouring gate 1 is designed based on the maximum thermal node size, so that the size of the pouring gate 1 is adapted to the thermal node characteristics of the casting 4, ensuring that the molten metal enters the mold cavity at an appropriate flow rate and flow velocity, avoiding splashing, insufficient pouring and other problems, and improving the quality of the casting 4; then, based on the obtained pouring gate 1 size and the maximum thermal node size, the size of the straight runner 3 is designed in accordance with the flow law of the molten metal and the pressure transmission requirements, further optimizing the flow path and pressure distribution of the molten metal in the casting system, ensuring smooth and continuous flow of the molten metal in the casting 4, reducing energy loss and turbulence, reducing the risk of defects such as pores and inclusions, and improving the internal quality of the casting 4; finally, based on the designed straight runner 3 size, the impact force of the molten metal is reduced, avoiding scouring and erosion of the bottom of the mold cavity, improving the flow state, further improving the filling capacity of the casting system, reducing the scrap rate, and reducing production costs.

[0071] In some specific embodiments of the present application, for the size of the pouring gate 1 , the maximum thermal node size is obtained, and the size of the pouring gate 1 is designed based on the maximum thermal node size, including:

[0072] Obtain the maximum thermal section size of the casting 4; based on the maximum thermal section size of the casting 4, use half of the maximum thermal section size of the casting 4 as the diameter of the pouring gate 1; use the same value as the maximum thermal section size of the casting 4 as the length of the pouring gate 1; and design the pouring gate 1 based on the diameter and length of the pouring gate 1.

[0073] In the above embodiments of the present application, the half value of the maximum thermal section size of the casting 4 is determined as the diameter of the sprue 1, and the same value as the maximum thermal section size of the casting 4 is taken as the length of the sprue 1, so that the diameter and length of the sprue 1 obtained can closely match the thermal section characteristics of the casting 4, control the metal liquid inflow speed, and avoid problems such as splashing caused by too fast flow speed or insufficient pouring caused by too slow flow speed; the same length of the sprue 1 and the maximum thermal section size helps to stabilize the metal liquid flow state, ensures the metal liquid to enter the cavity smoothly, improves the quality of the casting 4, and reduces defects.

[0074] In some specific embodiments of the present application, for designing the size of the sprue 1 according to the size of the sprue 1 and the maximum thermal section size, including:

[0075] obtaining the diameter of the sprue 1 and the maximum thermal section size of the casting 4; determining the diameter of the sprue 1 according to the diameter of the sprue 1, and the diameter of the sprue 1 is the same as the diameter of the sprue 1; determining the length of the sprue 1 according to the maximum thermal section size of the casting 4, and the length of the sprue 1 is one third of the maximum thermal section size of the casting 4; and designing the sprue 1 according to the diameter and length of the sprue 1.

[0076] In the above embodiments of the present application, the maximum thermal section size of the casting 4 is taken as a reference parameter for the collaborative design of the sprue 1 and the sprue 3 (i.e., the half of the maximum thermal section size is taken as the diameter of the sprue 1, the maximum thermal section size itself is taken as the length of the sprue 1, the diameter of the sprue 3 is kept in a 1:1 ratio with the sprue 1, and the length of the sprue 3 is one third of the maximum thermal section size), so that the precise matching of the pouring system and the thermal section characteristics of the casting 4 is realized. The high-temperature alloy melt has sufficient flow cross-sectional area and buffer space during injection, and the turbulent flow or insufficient filling caused by size mismatch is avoided, and the length and diameter of the sprue 3 effectively control the melt flow speed and pressure loss, so that the melt can smoothly transition to the cavity of the casting 4, and finally the size of the sprue 1 and the sprue 3 improves the stability and feeding efficiency of the melt filling, and reduces the shrinkage and porosity defects of the annular complex thin-walled casting 4.

[0077] The sprue 3 is connected to the sprue 1 through the sprue pocket 5.

[0078] In some specific embodiments of the present application, for connecting the Tesla valve type riser 2, the sprue 1, the sprue 3 and the sprue pocket 5 to the casting 4 to form a Tesla valve type pouring and feeding system, including:

[0079] Obtain the Tesla valve riser 2, pouring gate 1, sprue 3 and sprue nest 5 corresponding to the casting 4; connect the pouring gate 1 to the inlet of the Tesla valve riser 2, connect one end of the sprue 3 to the outlet of the Tesla valve riser 2, connect the other end of the sprue 3 to one end of the casting 4, and connect the sprue nest 5 to the other end of the casting 4.

[0080] In some specific embodiments of the present application, when the other end of the sprue 3 is connected to one end of the casting 4 and the sprue socket 5 is connected to the other end of the casting 4 , the sprue 3 and the sprue socket 5 are coaxial with the central axis of the casting 4 .

[0081] The end of the casting 4 with a larger diameter is arranged toward the sprue 3 , and the end of the casting 4 with a smaller diameter is arranged toward the sprue cavity 5 .

[0082] Specifically, a pouring gate 1 is designed and placed on the water inlet of the Tesla valve-type riser 2, and a sprue 3 is installed on the water outlet of the Tesla valve-type riser 2; the bottom of the sprue 3 is connected to the central axis of the annular complex thin-walled casting 4, and the large head (i.e., large diameter or large size) of the annular complex thin-walled casting 4 is placed upward; the sprue nest 5 is connected to the central axis of the small head (i.e., small diameter or small size) of the annular complex thin-walled casting 4, which plays a role in stabilizing the fluid.

[0083] In the above embodiment of the present application, during centrifugal casting, the high-temperature alloy melt enters from the pouring port 1 and flows through the annular complex thin-walled casting 4 to achieve control of loose defects. It not only has the advantages of traditional centrifugal casting thin-wall filling, but also adopts the Tesla valve type riser 2, and then enters the straight runner 3. After stably flowing through the straight runner nest 5, it smoothly enters the annular complex thin-walled casting 4. The remaining high-temperature alloy melt flows along the Tesla valve type riser 2 under the action of centrifugal force and flows back to the annular complex thin-walled casting 4 again for solidification and shrinkage compensation. By utilizing the characteristic of the Tesla valve to control the unidirectional flow of the melt, it can ensure that the high-temperature alloy melt is not thrown out of the casting 4, and the annular complex thin-walled casting 4 is continuously compensated for shrinkage, which can greatly reduce the tendency of shrinkage cavity and shrinkage formation, which is beneficial to improving the process yield of complex thin-walled high-temperature alloy castings 4.

[0084] The preferred features of the above embodiments can be used alone in any embodiment, or in any combination without conflict. In addition, parts not described in detail in the embodiments can be implemented using existing technologies.

[0085] The following further illustrates the present application in conjunction with specific application examples / comparative examples to facilitate a better understanding of the above technical solutions of the present application. It should be understood that the following are merely partial examples and are not intended to limit the present application.

[0086] Application Example 1: A circular aircraft engine impeller casting, precision-molded from K492M high-temperature alloy, has a diameter of approximately 300 mm, a height of approximately 70 mm, and a minimum wall thickness of approximately 1 mm. The thermal modulus method was first used to calculate the maximum thermal node size of the annular impeller casting, which was 100 mm. The maximum cross-sectional dimensions of a Tesla valve were constructed using a 50 mm reference. The Tesla valve was then rotated around its centerline to form a Tesla valve-shaped riser, which was then wrapped with 1 cm thick insulation. The Tesla valve-shaped riser was designed with a 50 mm diameter and a height of 100 mm. The pouring gate was positioned at the inlet of the Tesla valve-shaped riser. The sprue was 50 mm in diameter and 33 mm in length. The sprue was installed at the outlet of the Tesla valve-shaped riser. The bottom of the sprue was connected to the central axis of the impeller casting, with the large end of the impeller casting facing upward. The sprue socket was connected to the central axis of the small end of the impeller casting to stabilize the flow. Using this method, the high-temperature alloy melt enters the pouring gate, effectively controlling the porosity defects in the impeller casting. The remaining high-temperature alloy melt, under the action of centrifugal force, flows back into the impeller casting along the Tesla valve-shaped riser. Combined with the insulation, it provides solidification and shrinkage feeding. This significantly reduces the tendency for shrinkage cavities and porosity to form, resulting in an impeller casting with excellent internal quality.

[0087] Application Example 2: A test piece for an aviation high-temperature alloy guide was precision-molded from a rare earth high-temperature alloy, with a diameter of approximately 600 mm, a height of approximately 100 mm, and a minimum wall thickness of approximately 1.5 mm. The thermal modulus method was first used to calculate the maximum thermal node size of the impeller casting, which was 150 mm. The maximum cross-sectional dimensions of the Tesla valve were determined using a 75 mm reference. The Tesla valve was then rotated around its centerline to form a Tesla valve-shaped riser, which was then wrapped with 1 cm thick insulation. The Tesla valve-shaped riser was designed with a 75 mm diameter and a height of 150 mm. The pouring gate was positioned at the inlet of the Tesla valve-shaped riser. The sprue was 75 mm in diameter and 50 mm in length. The sprue was installed at the outlet of the Tesla valve-shaped riser. The bottom of the sprue connected to the center intersection of the guide runners. The runners were 50 mm in diameter and 300 mm in length. There were five runners, evenly distributed within the guide, with the large end of the guide casting positioned upward. The sprue nest is connected to the bottom of the central intersection, stabilizing the flow. Using this method, the high-temperature alloy melt enters the pouring gate, controlling the looseness of the guide casting. Under the action of centrifugal force, the remaining high-temperature alloy melt flows along the Tesla valve-shaped riser and back into the guide casting. Combined with the insulation, it solidifies and compensates for shrinkage. This significantly reduces the tendency for shrinkage cavities to form, indicating that this invention is applicable not only to annular parts with a central structure, but also to ring-in-ring parts without a central structure, demonstrating its strong universality.

[0088] The above describes some specific embodiments of the present application. It should be understood that the present application is not limited to the specific embodiments described above, and those skilled in the art may make various variations or modifications within the scope of the claims, which do not affect the substantive content of the present application. The above preferred features may be used in any combination as long as they do not conflict with each other.

Claims

1. A design method for a centrifugal casting pouring system of a Tesla valve structure, characterized in that: include: The thermal modulus method is used to calculate the maximum thermal node size of annular complex thin-walled castings and construct a Tesla valve-type riser. Designing the pouring gate, sprue and sprue pocket according to the maximum thermal node size; The Tesla valve-type riser, the pouring gate, the sprue and the sprue nest are connected to the casting to form a Tesla valve structure pouring system corresponding to the casting.

2. The design method of a centrifugal casting rigging system for a Tesla valve structure according to claim 1, characterized in that: The thermal modulus method is used to calculate the maximum thermal node size of an annular complex thin-walled casting and construct a Tesla valve-type riser, including: Obtaining dimensional information of the casting, and calculating the maximum thermal node size of the casting using the thermal modulus method; The maximum cross-sectional dimensions of the Tesla valve are constructed based on the maximum thermal node dimensions and the set dimension range; The maximum cross-sectional dimension of the Tesla valve is rotated around the center line to form a Tesla valve type riser.

3. The design method of a centrifugal casting rigging system for a Tesla valve structure according to claim 2, characterized in that: The step of obtaining the dimension information of the casting and calculating the maximum thermal node dimension of the casting by the thermal modulus method includes: Obtain the three-dimensional dimensional information of the casting, import it into the ProCAST casting simulation software, divide the mesh and set the boundary conditions, load the material thermophysical parameters calculated by JMatPro, perform solidification simulation without filling process, and use the ProCAST post-processing viewer module to view the calculation results; By observing the temperature field distribution, find the area with relatively high temperature and slow cooling, and determine the hot spot area; The area or volume of the heat node is estimated based on the temperature contour information of the heat node area and the area surrounded by the temperature contour, and the maximum heat node size data is determined.

4. The design method of a centrifugal casting rigging system for a Tesla valve structure according to claim 2, characterized in that: The outside of the Tesla valve-type riser is provided with thermal insulation cotton.

5. The design method of a centrifugal casting rigging system for a Tesla valve structure according to claim 2, characterized in that: The set size range is half of the maximum heat node size.

6. The design method of a centrifugal casting rigging system for a Tesla valve structure according to claim 2, characterized in that: The designing of the pouring gate, sprue and sprue nest according to the maximum thermal node size includes: Obtaining the maximum thermal node size, and designing the size of the pouring gate according to the maximum thermal node size; Designing the size of the sprue according to the size of the pouring gate and the maximum thermal node size; The size of the sprue cavity is designed according to the size of the sprue.

7. The design method of a centrifugal casting rigging system for a Tesla valve structure according to claim 6, characterized in that: The obtaining of the maximum thermal section size and designing the size of the pouring gate according to the maximum thermal section size include: Obtaining the maximum hot spot size of the casting; According to the maximum hot spot size of the casting, half of the maximum hot spot size of the casting is used as the diameter of the pouring gate; The length of the pouring gate is the same as the maximum hot spot size of the casting; The pouring gate is designed by its diameter and length.

8. The design method of a centrifugal casting rigging system for a Tesla valve structure according to claim 7, characterized in that: The design of the sprue size according to the pouring gate size and the maximum hot spot size includes: Obtaining the diameter of the pouring gate and the maximum hot spot size of the casting; Determining the diameter of the sprue according to the diameter of the pouring gate, wherein the diameter of the pouring gate is the same as the diameter of the sprue; According to the maximum thermal zone size of the casting, one third of the maximum thermal zone size of the casting is used as the length of the sprue; Designing the sprue according to the diameter and length of the sprue; The sprue socket is a hemispherical structure, and its diameter is the same as that of the sprue.

9. The design method of a centrifugal casting rigging system for a Tesla valve structure according to claim 1, characterized in that: The Tesla valve riser, the pouring gate, the sprue and the sprue nest are connected to the casting to form a rigging system of a Tesla valve structure corresponding to the casting, including: Obtaining the Tesla valve-type riser, the pouring gate, the sprue, and the sprue nest corresponding to the casting; The pouring gate is connected to the inlet of the Tesla valve type riser, one end of the sprue is connected to the outlet of the Tesla valve type riser, the other end of the sprue is connected to one end of the casting, and the sprue nest is connected to the other end of the casting.

10. The design method of a centrifugal casting rigging system for a Tesla valve structure according to claim 8, characterized in that: The other end of the sprue is connected to one end of the casting, and when the sprue nest is connected to the other end of the casting, the sprue and the sprue nest are coaxial with the central axis of the casting; Wherein, the end of the casting with a large diameter is arranged toward the sprue, and the end of the casting with a small diameter is arranged toward the sprue cavity.

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