Wax mould for precision casting

Abstract

The utility model relates to a wax mould for precision casting, which comprises a loose piece group which is formed by combining a plurality of loose piece monomers and is rotationally connected to a lower mould through a guide rail; the upper mold core is arranged corresponding to the loose piece group and comprises a plurality of second mold cavities and a second groove covering the front edge of the turbine rotor wax mold blade; and a mold sealing line of the loose piece group and the upper mold core is positioned at a blade body position of the turbine rotor wax mold. The mold is compact and reasonable in structure and convenient to operate, quick and convenient mold opening and demolding operation is realized through the ingenious design of the loose piece group and the upper mold core, and the manufacturing efficiency is improved. And secondly, through precise positioning and forming design, the precision and stability of the turbine rotor wax mold in the casting process are ensured, and therefore the overall quality and performance of products are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of investment casting, in particular to a wax mold for precision casting. Background Art

[0002] The integral turbine rotor wax model is a key component in the turbine chamber of advanced aircraft turbojet engines. It consists of the turbine disk and rotor blades. Investment casting is the molding method for integral turbine rotor wax models, which provides excellent dimensional accuracy and ensures the functionality and reliability of the turbine rotor wax model in the engine.

[0003] Investment casting is the manufacturing process for integral turbine rotor wax models, which includes mold manufacturing, wax mold pressing, shell making, dewaxing, smelting and pouring, post-processing, machining, assembly, and commissioning. In this process, the wax mold pressed from the mold is the most important raw material. The dimensional accuracy of the wax mold affects the accuracy of the turbine rotor wax casting, which directly affects the performance and reliability of the engine. Factors that affect the dimensional accuracy of the wax mold are, on the one hand, the accuracy of mold manufacturing and assembly, and, on the other hand, the surface tension between the blade block assembly 100 and the wax mold during the wax pressing and demolding process, which causes the blades to be pulled, thus deforming the blades. This, in turn, determines the deformation of the casting blades and affects the engine's aerodynamic efficiency. This is a shortcoming in production technology. Therefore, improving the accuracy of the wax mold is a representative, economical, and important technology for improving the reliability of advanced engines.

[0004] The parting lines of the traditional movable block group 100 are at the leading and trailing edges of the turbine rotor wax mold 200, resulting in mold edges being set at the leading and trailing edges after the workpiece is molded. At the same time, the leading and trailing edges are arc-shaped structures, and the mold edges are very difficult to clean.

[0005] For this purpose, we propose a wax mold for precision casting. Utility Model Content

[0006] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides a wax mold for precision casting. Through the ingenious design of the movable block group and the upper mold core, fast and convenient mold opening and demolding operations are achieved, thereby improving manufacturing efficiency.

[0007] The technical solutions adopted in this utility model are as follows:

[0008] A wax mold for precision casting, comprising:

[0009] The movable block group is composed of a plurality of movable block units, which are rotatably connected to the lower mold via a guide rail to form an annular structure corresponding to the blade layout of the turbine rotor wax mold. Each movable block unit is provided with a first mold cavity and a first groove covering the trailing edge of the turbine rotor wax mold blade;

[0010] The upper mold core is arranged corresponding to the movable block group, comprising a plurality of second mold cavities and a second groove covering the leading edge of the turbine rotor wax mold blade, and is used to form a casting mold cavity of the turbine rotor wax mold with the movable block combination mold;

[0011] Among them, the sealing line of the movable block group and the upper mold core is located at the blade position of the turbine rotor wax mold, which realizes rapid mold opening and reduces the generation of mold edges.

[0012] Furthermore, the loose block group includes a plurality of loose block units distributed in an annular shape to match the number of blades of the turbine rotor wax mold.

[0013] Furthermore, a first groove is provided at the bottom of the first mold cavity on each movable block monomer for accurately positioning and forming the trailing edge of the turbine rotor wax mold blade.

[0014] Furthermore, the second mold cavity on the upper mold core fits the upper surface of the blade of the turbine rotor wax mold, and a second groove is opened at the upper end of the second mold cavity for accurately positioning and forming the leading edge of the turbine rotor wax mold blade.

[0015] Furthermore, the guide rail allows the movable block assembly to rotate along the guide rail and slide out when the mold is opened, thereby achieving easy separation from the turbine rotor wax mold.

[0016] Furthermore, the sealing line is located at the blade body position, where the airflow size requirement is relatively low, so that slight marks or mold edges have little effect on the aerodynamic performance of the turbine rotor wax mold.

[0017] The beneficial effects of the utility model are as follows:

[0018] This utility model has a compact and reasonable structure and is easy to operate. Through the ingenious design of the movable block group and the upper mold core, it realizes fast and convenient mold opening and demolding operations, thereby improving manufacturing efficiency. Secondly, through precise positioning and molding design, the accuracy and stability of the turbine rotor wax mold during the casting process are ensured, thereby improving the overall quality and performance of the product. Finally, by considering the convenience and efficiency of demolding, the difficulty and risk of operation are reduced, and the overall production efficiency and economic benefits are further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an exploded view of the present invention.

[0020] Figure 2 for Figure 1 Bottom view of .

[0021] Figure 3 It is a cross-sectional view of the present utility model.

[0022] Figure 4 This is a front view of the turbine rotor wax mold in the utility model.

[0023] Figure 5 for Figure 1 A partial enlarged view of part A in the middle.

[0024] Figure 6 for Figure 2 A partial enlarged view of part B in the middle.

[0025] Figure 7 It is a schematic diagram of the connection structure between the movable block group and the lower mold in the utility model.

[0026] Among them: 100, movable block group; 101, first mold cavity; 102, first groove; 103, guide rail; 200, turbine rotor wax mold; 201, trailing edge; 202, leading edge; 300, upper mold core; 301, second mold cavity; 302, second groove; 400, lower mold. DETAILED DESCRIPTION

[0027] The specific implementation of the present utility model will be described below with reference to the accompanying drawings.

[0028] like Figures 1-6 As shown, the present embodiment discloses a wax mold for precision casting, the structure of which includes a plurality of movable block groups 100, a turbine rotor wax mold 200 and an upper mold core 300. The movable block group 100 is rotated out through a guide rail. This design enables the mold opening position to be set at the blade body of the turbine rotor wax mold 200, thereby achieving rapid mold opening, and mold edges are not easily generated during the mold opening process. Even if mold edges are generated, they can be easily processed due to the characteristics of the blade body position, thereby significantly improving the quality of the turbine rotor wax mold 200. This design not only improves the mold opening efficiency, but also reduces the difficulty and cost of subsequent processing, which is of great significance for improving the overall manufacturing quality of the turbine rotor wax mold.

[0029] Specific examples Figure 4 As shown, the lower and upper ends of the turbine rotor wax model 200 blades in this embodiment are provided with a trailing edge 201 and a leading edge 202, respectively. The design of the trailing edge 201 and the leading edge 202 is crucial to the performance of the turbine rotor wax model. Furthermore, to enhance the blade's performance, both the trailing edge 201 and the leading edge 202 are designed as curved structures. This curved design optimizes airflow over the blade surface, reduces airflow separation and vortex generation, and thus improves the aerodynamic performance and efficiency of the turbine rotor wax model.

[0030] like Figure 1 、 Figure 3 、 Figure 5 and Figure 7As shown, the movable block group 100 in this embodiment includes 23 movable block monomers. These movable block monomers are rotatably connected to the lower mold 400 through a guide rail 103, and multiple movable block monomers are distributed in a ring to form an annular structure corresponding to the blades on the turbine rotor wax mold 200. Each movable block monomer is provided with a first mold cavity 101 that fits the bottom surface of the turbine rotor wax mold 200, and the bottom wall of the first mold cavity 101 is provided with a first groove 102 for covering the trailing edge 201 of the blade of the turbine rotor wax mold 200. That is, the trailing edge 201 of the turbine rotor wax mold 200 is completely placed in the first groove 102. This design ensures the precise positioning and forming of the trailing edge 201 during the casting process, avoids deformation and dimensional deviation of the trailing edge, and thus improves the overall accuracy and performance of the turbine rotor wax mold.

[0031] Furthermore, the design of the movable block assembly 100 also takes into account the convenience and efficiency of mold opening. Because the movable blocks are rotatably connected to the grooves in the lower mold 400 via guide rails 103, the movable block assembly 100 can rotate along the guide rails 103 and slide out during mold opening, enabling a quick and convenient mold opening operation. This design not only improves mold opening efficiency but also reduces the risk of damage to the turbine rotor wax mold during the mold opening process, helping to enhance overall product quality and manufacturing efficiency.

[0032] like Figure 2 、 Figure 3 and Figure 6 As shown, the upper mold core 300 in this embodiment is arranged corresponding to the movable block group 100, and through the contact between the upper mold core 300 and the movable block group 100, a cavity for processing the turbine rotor wax mold 200 is provided. The design of the upper mold core 300 is crucial to ensuring the precise molding of the turbine rotor wax mold. The upper mold core 300 in this embodiment is provided with a plurality of second mold cavities 301 corresponding to the number of blades on the turbine rotor wax mold 200. The second mold cavities 301 fit the upper surface of the blades, thereby ensuring the precise positioning and molding of the blades in the upper mold core 300. At the same time, the upper end of the second mold cavity 301 is provided with a second groove 302 covering the leading edge 202 of the blade of the turbine rotor wax mold 200, that is, the leading edge 202 of the turbine rotor wax mold 200 is completely placed in the second groove 302. This design ensures the precise positioning and molding of the leading edge 202 during the casting process, avoids deformation and dimensional deviation of the leading edge, and thus improves the overall accuracy and aerodynamic performance of the turbine rotor wax mold.

[0033] By vertically docking the upper mold core 300 and the movable block group 100, the sealing line of the two will be located at the blade position of the turbine rotor wax mold 200. This design has significant advantages. On the one hand, the airflow size requirements of the blade are not as high as the leading edge 202 and the trailing edge 201. Therefore, even if the sealing line produces a slight mark or mold edge at the blade position, it will not have a significant impact on the aerodynamic performance of the turbine rotor wax mold. On the other hand, since the blade position is relatively smooth and flat, it is not easy for the sealing line to remain. Even if there is a sealing line, it can be easily removed and processed due to the characteristics of the blade position, which not only reduces the difficulty and cost of subsequent processing, but also improves the overall quality of the turbine rotor wax mold.

[0034] Furthermore, the blade opening block assembly 100 can be rotated out parallel to the upper and lower molds during the mold opening process. This mold opening method reduces the stress impact on the turbine rotor wax mold 200. Because the block assembly 100 is rotated out parallel to the upper and lower molds during the mold opening process, excessive stress concentration and deformation of the turbine rotor wax mold 200 are avoided, thereby ensuring the stability and precision of the turbine rotor wax mold during the casting process. This not only improves the manufacturing quality of the turbine rotor wax mold, but also reduces the scrap rate caused by stress concentration and deformation.

[0035] Furthermore, the wax mold in this embodiment also takes into account the convenience and efficiency of demolding. Because the movable block assembly 100 can rotate and slide along the guide rails 103, the turbine rotor wax mold 200 can be easily separated from the mold during demolding. This design not only improves demolding efficiency but also avoids damage or deformation of the turbine rotor wax mold caused by demolding difficulties.

[0036] The specific working principle is as follows:

[0037] During the casting process, the loose piece assembly 100 is first rotated and installed in the grooves defined in the lower mold 400 via guide rails 103, ensuring that all loose pieces are precisely aligned to form an annular structure corresponding to the turbine rotor blades. The upper mold core 300 is then vertically docked onto the loose piece assembly 100, with the sealing line between the two aligned at the blade surface of the turbine rotor wax mold 200. Because the blade surface is relatively flat, the sealing line is less likely to form a mold edge at this location, and even if it does, it is easily removed.

[0038] Next, molten wax is injected into the mold cavity formed by the loose piece assembly 100 and the upper mold core 300. After cooling, the wax forms a wax pattern that matches the shape of the turbine rotor wax model. Thanks to the precise fit of the loose piece assembly 100 and the upper mold core 300, as well as the precise design of the first and second mold cavities 101, 301, and the first and second grooves 102, 302, the wax pattern accurately replicates the shape and dimensions of the turbine rotor wax model, including details such as the leading edge 202, trailing edge 201, and airfoil of the blade.

[0039] After the wax mold cools and solidifies, the mold is opened. Because the loose piece assembly 100 is rotatably connected to the lower mold 400 via guide rails 103, the mold can be easily opened by rotating the loose piece units. This mold opening method is not only quick and convenient, but also avoids damage or deformation to the wax mold.

[0040] In summary, the wax mold for precision casting of the turbine rotor wax mold in this embodiment has many advantages. First, through the ingenious design of the movable block group 100 and the upper mold core 300, fast and convenient mold opening and demolding operations are achieved, thereby improving manufacturing efficiency. Secondly, through precise positioning and molding design, the accuracy and stability of the turbine rotor wax mold 200 during the casting process are ensured, thereby improving the overall quality and performance of the product. Finally, by considering the design of demolding convenience and efficiency, the operational difficulty and risk are reduced, and the overall production efficiency and economic benefits are further improved.

[0041] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the scope of protection of the utility model.

Claims

1. A wax mold for precision casting, characterized in that: include: The movable block group (100) is composed of a plurality of movable block monomers and is rotatably connected to the rotary groove provided on the lower mold (400) via a guide rail (103); An upper mold core (300) is arranged corresponding to the movable block group (100), comprises a plurality of second mold cavities (301) and a second groove (302) covering the leading edge (202) of the turbine rotor wax mold blade, and is used for forming a casting mold cavity of the turbine rotor wax mold (200) by combining with the movable block group (100); The sealing lines of the movable block group (100) and the upper mold core (300) are located at the blade position of the turbine rotor wax mold (200), thereby realizing rapid mold opening and reducing the generation of mold edges.

2. A wax mold for precision casting according to claim 1, characterized in that: The loose block group (100) includes a plurality of loose block units distributed in an annular shape to match the number of blades of the turbine rotor wax mold (200).

3. A wax mold for precision casting according to claim 1, characterized in that: A first groove (102) is provided at the bottom of the first mold cavity (101) on each movable block monomer for accurately positioning and molding the trailing edge (201) of the turbine rotor wax mold blade.

4. A wax mold for precision casting according to claim 1, characterized in that: The second mold cavity (301) on the upper mold core (300) fits the upper surface of the blade of the turbine rotor wax mold (200), and a second groove (302) is provided at the upper end of the second mold cavity (301) for accurately positioning and forming the leading edge (202) of the turbine rotor wax mold blade.

5. The wax mold for precision casting according to claim 1, characterized in that: The guide rail (103) allows the movable block group (100) to rotate along the guide rail and slide out when the mold is opened, thereby achieving easy separation from the turbine rotor wax mold (200).

6. A wax mold for precision casting according to claim 1, characterized in that: The sealing mold line is located at the blade body position, and the airflow size requirement at this position is relatively low, so that slight marks or mold edges have little effect on the aerodynamic performance of the turbine rotor wax mold.

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