Seeding structure for single crystal blade, blade wax mold module and preparation method of blade wax mold module

Abstract

The invention discloses a seeding structure for a single crystal blade, a blade wax mold module and a preparation method of the blade wax mold module. The seeding structure comprises a crystal selector, a seeding transition section, a supporting rod and a base, the seeding transition section is of a conical structure, the large-diameter end of a first branch part of the seeding transition section is connected with the blade wax mold into a whole, the small-diameter end of a second branch part of the seeding transition section is connected with the first end of the crystal selector into a whole, and a preset distance is formed between the connection position of the first branch part and the second branch part and the small-diameter end; and the supporting rod is supported between the base and the second branch part. The preset distance is formed between the connecting position of the first subsection and the second subsection and the small-diameter end, the connecting area between the blade wax mold and the crystal selector can be increased, meanwhile, the supporting roller is supported between the second subsection and the base, the blade wax mold can be supported in an auxiliary mode, and the blade wax mold is prevented from being damaged. Therefore, single crystal grains selected by a crystal selector can be guided and expanded to a blade cavity, meanwhile, the effect of supporting the weight of a wax mold is achieved, and cracks of a mold shell are reduced.

Description

Technical Field

[0001] This application relates to the field of precision casting technology, and more specifically, to a crystal-leading structure for single-crystal blades, a blade wax mold module, and a method for preparing the same. Background Technology

[0002] As the size of single-crystal blades continues to increase, the weight of the blade wax mold and its shell also increases. During the shell preparation process, because the cross-sectional area at the connection point between the crystal selector and the blade wax mold is small, it is insufficient to support the weight of the wax mold and its shell. Cracks are easily generated at this location, resulting in the shell being scrapped. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a crystal-guiding structure for single-crystal blades, which can guide and extend the single-crystal grains selected by the crystal selector to the blade cavity while supporting the weight of the wax mold and reducing shell cracks.

[0004] Another objective of this application is to provide a blade wax mold module having the above-described crystal-leading structure for single-crystal blades.

[0005] Another objective of this application is to provide a method for preparing a blade wax model module for the above-mentioned blade wax model module.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A seed structure for single-crystal blades, comprising:

[0008] Crystal selector;

[0009] The crystal-leading transition section is a conical structure, and includes a first portion with a large-diameter end and a second portion with a small-diameter end. The large-diameter end of the first portion is used to connect with the blade wax mold as a whole, and the small-diameter end of the second portion is used to connect with the first end of the crystal selector as a whole. The connection position of the first portion and the second portion is at a preset distance from the small-diameter end.

[0010] A support rod, the support rod being used to support the second portion;

[0011] The base is integrated with the second end of the crystal selector and the support rod.

[0012] Optionally, in the above-described crystal-leading structure for single-crystal blades, the distance between the support rod and the crystal selector is not less than 8 mm, and the distance between the support rod and the crystal selector is not greater than the width of the blade wax mold.

[0013] Optionally, in the above-described crystal-leading structure for single-crystal blades, the diameter of the support rod is not less than 2 mm.

[0014] Optionally, in the above-described crystal-leading structure for single-crystal blades, the support rod is inserted into the second portion, and the insertion depth of the support rod is 3mm to 10mm.

[0015] Optionally, in the above-described crystal-leading structure for single-crystal blades, the depth to which the support rod is inserted into the base is 3mm to 10mm.

[0016] Optionally, in the above-described crystal-leading structure for single-crystal blades, the first portion and the second portion are connected by welding.

[0017] Optionally, in the above-described crystal-leading structure for single-crystal blades, the support rod is made of ceramic; and / or,

[0018] The crystal selector is a spiral crystal selector or a seed crystal selector.

[0019] A blade wax mold module includes a base plate, blade wax molds, and a crystal-leading structure for single-crystal blades as described in any of the preceding claims. There are multiple blade wax molds, each distributed circumferentially along the base plate, and each blade wax mold is connected to the base plate via the crystal-leading structure.

[0020] A method for preparing a blade wax model module, for the blade wax model module as described above, includes the following steps:

[0021] To prepare a blade wax model, the first portion of the crystal-leading transition section is pressed into the blade wax model using a first mold, and the two ends of the crystal selector are pressed into the second portion of the crystal-leading transition section and the base using a second mold, respectively, and the support rod is supported between the second portion and the base.

[0022] Assemble the blade wax mold and connect the first part and the second part by welding;

[0023] A marking plate is used to mark the positions of the bases of each of the blade wax models;

[0024] Assemble the blade wax model module by welding the base of each blade wax model to the marked position on the base plate.

[0025] Optionally, in the above method for preparing the blade wax model module, the step of setting the marking base plate specifically includes:

[0026] A marking plate is prepared by marking the base position of the blade wax model on a plate having the same size as the base plate to form a marking plate;

[0027] Install the marking plate and attach it to the base plate.

[0028] The crystal-leading structure for single-crystal blades provided in this application comprises a crystal selector, a crystal-leading transition section, a support rod, and a base. The large-diameter end of the first section of the crystal-leading transition section is integrally connected to the blade wax model, and the small-diameter end of the second section of the crystal-leading transition section is integrally connected to the first end of the crystal selector. A predetermined distance exists between the connection point of the first and second sections and the small-diameter end. Simultaneously, the second end of the crystal selector is integrally connected to the base, and the support rod supports the second section between the base and the base. As can be seen from the above example, the crystal-leading structure for single-crystal blades provided in this application increases the connection area between the blade wax model and the crystal selector by maintaining a predetermined distance between the connection point of the first and second sections and the small-diameter end. Simultaneously, the support rod between the second section and the base assists in supporting the blade wax model, ensuring that no cracks occur during the mold preparation process. Therefore, while guiding the single-crystal grains selected by the crystal selector to expand into the blade cavity, it also supports the weight of the wax model, reducing the likelihood of mold cracks.

[0029] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of a traditional seed crystal structure;

[0032] Figure 2 This is a schematic diagram of the structure of the crystal-driving transition section provided in an embodiment of this application;

[0033] Figure 3 An exploded view of the lead-in transition section provided in an embodiment of this application;

[0034] Figure 4 A schematic diagram of the structure of the second part provided in the embodiments of this application;

[0035] Figure 5This is a schematic diagram of the structure of the blade wax model module provided in the embodiments of this application;

[0036] Figure 6 This is a schematic diagram of the structure of the base plate provided in the embodiments of this application;

[0037] Figure 7 This is a schematic flowchart of the method for preparing a blade wax model module provided in the embodiments of this application;

[0038] Figure 8 This is a flowchart illustrating the marking base plate provided in an embodiment of this application.

[0039] Among them, 010 is the crystal selector, 020 is the crystal-leading transition section, and 0200 is the blade wax model;

[0040] 100 is the crystal-leading structure, 10 is the crystal selector, 20 is the crystal-leading transition section, 21 is the first section, 22 is the second section, 30 is the support rod, and 40 is the base.

[0041] 200 is a wax model of the blade;

[0042] 300 is the blade wax model module, and 301 is the base plate. Detailed Implementation

[0043] The core of this application is to provide a crystal-guiding structure for single-crystal blades, which can guide and extend the single-crystal grains selected by the crystal selector to the blade cavity while supporting the weight of the wax mold and reducing shell cracks.

[0044] Another key aspect of this application is to provide a blade wax mold module having the aforementioned seeding structure for single-crystal blades.

[0045] Another core aspect of this application is to provide a method for preparing a blade wax model module for the aforementioned blade wax model module.

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] Single-crystal superalloys, due to the elimination of grain boundaries perpendicular to the stress axis, possess excellent high-temperature creep resistance, thermomechanical fatigue properties, and high temperature resistance, and are therefore widely used as high-pressure turbine blade materials for aero-engines and gas turbines.

[0048] like Figure 1As shown, the production of single-crystal turbine blades first requires guiding the crystal generated by the crystal selector 010 to the blade cavity through the crystal-guiding transition section 020. As the size of the single-crystal blade increases, the weight of the blade wax mold 0200 and its shell also increase. During the shell preparation process, because the cross-sectional area at the connection point between the crystal selector 010 and the blade wax mold 0200 is small, it is insufficient to support the weight of the blade wax mold 0200 and its shell. Cracks easily form in this location, resulting in the shell being scrapped.

[0049] Therefore, such as Figures 2 to 4 As shown in the figure, this application discloses a crystal-leading structure for single-crystal blades, including a crystal selector 10, a crystal-leading transition section 20, a support rod 30, and a base 40. By having a preset distance between the connection position of the first portion 21 and the second portion 22 of the crystal-leading transition section 20 and the small-diameter end, the connection area between the blade wax mold 200 and the crystal selector 10 can be increased. At the same time, the support rod 30, which is supported between the second portion 22 and the base 40, can help support the blade wax mold 200, ensuring that no cracks are generated during the mold preparation process. Thus, while guiding the single-crystal grains selected by the crystal selector 10 to expand into the blade cavity, it also supports the weight of the wax mold, reducing the risk of mold cracks.

[0050] The following will combine Figures 2 to 4 The crystal-guiding structure for single-crystal blades disclosed in the embodiments of this application will be explained and described in detail.

[0051] Among them, such as Figure 2 and Figure 3 As shown, the lead-in transition section 20 can adopt a conical structure, and the lead-in transition section 20 has a large-diameter end and a small-diameter end arranged opposite to each other. The lead-in transition section 20 can be composed of a first portion 21 with a large-diameter end and a second portion 22 with a small-diameter end. For example... Figure 3As shown, the large-diameter end of the first section 21 can be integrated with the blade wax mold 200, and the small-diameter end of the second section 22 can be integrated with the first end of the crystal selector 10. The first section 21 and the second section 22 can be welded together by an electric welding knife. The connection position of the first section 21 and the second section 22 has a preset distance from the small-diameter end. Compared with the traditional method of setting the connection position of the crystal selector 010 and the crystal-leading transition section 020 at the small-diameter end of the crystal-leading transition section 020, the connection area between the blade wax mold 200 and the crystal selector 10 can be increased. At the same time, the base 40 is integrated with the second end of the crystal selector 10 and the support rod 30. The support rod 30 can support the second section 22, thereby assisting in supporting the blade wax mold 200. This ensures that no cracks are generated during the shell preparation process. In addition, it can guide the single crystal grains selected by the crystal selector 10 to expand into the blade cavity while supporting the weight of the wax mold and reducing shell cracks. In addition, the base 40 of the lead crystal structure 100 can play an auxiliary positioning role when the blade wax mold 200 is assembled.

[0052] In some embodiments, in order to ensure the stability of the support rod 30, the horizontal distance between the support rod 30 and the crystal selector 10 is not less than 8 mm, and the distance between the support rod 30 and the crystal selector 10 is not greater than the width of the blade wax mold 200, so as to avoid the failure of the support function of the support rod 30.

[0053] In some embodiments, in order to ensure that the support rod 30 has a certain strength and rigidity, the support rod 30 may be made of ceramic material, and the diameter of the support rod 30 may be not less than 2mm, so that the support rod 30 has greater strength and rigidity and ensures the stability of the support rod 30.

[0054] In some embodiments, such as Figure 4 As shown, the support rod 30 can be inserted into the second part 22, and the insertion depth of the support rod 30 can be 3mm to 10mm, so that the connection between the support rod 30 and the second part 22 is more reliable, thereby ensuring the stability of the support rod 30.

[0055] In some embodiments, such as Figure 4 As shown, the support rod 30 and the base 40 can be connected by a plug-in joint, and the depth of the support rod 30 inserted into the base 40 can be 3mm to 10mm, so as to make the connection between the support rod 30 and the base 40 more reliable.

[0056] In some embodiments, such as Figures 2 to 4 As shown, the crystal selector 10 can be a spiral crystal selector or a seed crystal selector. When the crystal selector 10 is a spiral crystal selector, the second end of the crystal selector 10 can be directly connected to the base 40; when the crystal selector 10 is a seed crystal selector, the second end of the crystal selector 10 can be inserted into the base 40, and the insertion depth can be 3mm to 10mm.

[0057] The crystal-leading structure 100 for single-crystal blades disclosed in this application comprises a crystal selector 10, a crystal-leading transition section 20, a support rod 30, and a base 40. The large-diameter end of the first portion 21 of the crystal-leading transition section 20 is integrally connected to the blade wax model 200. The small-diameter end of the second portion 22 of the crystal-leading transition section 20 is integrally connected to the first end of the crystal selector 10. A predetermined distance exists between the connection point of the first portion 21 and the second portion 22 and the small-diameter end. Simultaneously, the second end of the crystal selector 10 is integrally connected to the base 40, and the support rod 30 is supported between the second portion 22 and the base 40.

[0058] The crystal-leading structure 100 for single-crystal blades disclosed in this application increases the connection area between the blade wax mold 200 and the crystal selector 10 by having a preset distance between the connection position of the first portion 21 and the second portion 22 and the small-diameter end. At the same time, the support rod 30 is supported between the second portion 22 and the base 40, which can help support the blade wax mold 200 and ensure that no cracks are generated during the shell preparation process. Thus, while guiding the single-crystal grains selected by the crystal selector 10 to expand into the blade cavity, it can also support the weight of the wax mold and reduce shell cracks.

[0059] like Figure 5 As shown in the embodiments, this application also discloses a blade wax mold module 300, including a base plate 301, a blade wax mold 200, and a crystal-leading structure. The crystal-leading structure is the crystal-leading structure 100 for single-crystal blades disclosed in the above embodiments, and therefore has all the technical effects of the crystal-leading structure 100 for single-crystal blades mentioned above, which will not be repeated here.

[0060] Among them, such as Figure 5 As shown, multiple blade wax models 200 can be used, i.e., two, three, or more blade wax models 200 can be used. In this embodiment, seven blade wax models 200 are used, and each blade wax model 200 is distributed circumferentially along the base plate 301, as shown below. Figure 5 and Figure 6 As shown, each blade wax mold 200 can be connected to the base plate 301 through the lead-in structure 100 to realize the assembly of the blade wax mold module 300.

[0061] like Figure 7 As shown in the embodiments, this application also discloses a method for preparing a blade wax model module, which, based on the blade wax model module 300 disclosed in the above embodiments, possesses all the technical effects of the aforementioned blade wax model module 300, and will not be repeated here. The method for preparing the blade wax model module may include step S100 of preparing a blade wax model, step S200 of assembling the blade wax model, step S300 of marking the base plate, and step S400 of assembling the blade wax model module.

[0062] The following will combine Figures 2 to 8 The method for preparing the blade wax model module disclosed in the embodiments of this application will be explained and described in detail.

[0063] Step S100: Prepare a wax model of the blade;

[0064] like Figure 3 As shown, the first portion 21 of the crystal-leading transition section 20 is pressed into a single unit with the blade wax mold 200 using a first mold, and the two ends of the crystal selector 10 are pressed into a single unit with the second portion 22 of the crystal-leading transition section 20 and the base 40 using a second mold, respectively, and the support rod 30 is supported between the second portion 22 and the base 40, as shown. Figure 4 As shown. It should be noted that the base 40 can be made of wax material.

[0065] Step S200: Assemble the blade wax model;

[0066] like Figure 2 As shown, the first part 21 and the second part 22 are welded together by an electric welding knife, which not only ensures that the blade wax mold 200 and the shell have sufficient strength and reduces the risk of breakage, but also does not affect the crystal selection effect.

[0067] Step S300: Mark the base plate;

[0068] like Figure 6 As shown, the positions of the bases 40 of each blade wax model 200 are marked on the base plate 301. For example, Figure 8 As shown, the steps for marking the base plate can specifically include step S301 preparing the marking plate and step S302 installing the marking plate.

[0069] Step S301: Prepare the labeling plate;

[0070] An opening with the same cross-sectional size as the base 40 can be made on a plate with the same size as the base plate 301, so as to mark the position of the base 40 of the blade wax model 200 to form a marking plate.

[0071] Step S302, install the marking plate;

[0072] By attaching the marking plate to the base plate 301, the position of the base 40 of each blade wax model 200 can be marked on the base plate 301. This eliminates the need to prepare a specific base plate 301, and the marking plate can be reused, saving costs. At the same time, it reduces the processing difficulty of the base plate 301 and improves the assembly efficiency of the blade wax model module 300.

[0073] It should be noted that, in order to facilitate the positioning of the blade wax model 200's angle and position, the base 40 of the blade wax model 200 can adopt a cuboid structure, and the opening on the marking plate can adopt a rectangular opening with the same cross-sectional dimensions as the base 40.

[0074] Step S400: Assemble the blade wax model module;

[0075] The blade wax model module 300 can be prepared by welding the base 40 of each blade wax model 200 to the marked position on the base plate 301.

[0076] The terms "first" and "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units may include steps or units not listed, but rather not listed.

[0077] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A seeding structure for single-crystal blades, characterized in that, include: Crystal selector (10); The crystal-leading transition section (20) is a conical structure, and the crystal-leading transition section (20) includes a first part (21) with a large diameter end and a second part (22) with a small diameter end. The large diameter end of the first part (21) is used to connect with the blade wax mold (200) as a whole, and the small diameter end of the second part (22) is used to connect with the first end of the crystal selector (10) as a whole. The connection position of the first part (21) and the second part (22) is at a preset distance from the small diameter end. Support rod (30), the support rod (30) is used to support the second part (22); The base (40) is integrated with the second end of the crystal selector (10) and the support rod (30).

2. The crystal-guiding structure for single-crystal blades according to claim 1, characterized in that, The distance between the support rod (30) and the crystal selector (10) is not less than 8 mm, and the distance between the support rod (30) and the crystal selector (10) is not greater than the width of the blade wax mold (200).

3. The crystal-guiding structure for single-crystal blades according to claim 1, characterized in that, The diameter of the support rod (30) is not less than 2 mm.

4. The seed structure for single-crystal blades according to claim 1, characterized in that, The support rod (30) is inserted into the second part (22), and the insertion depth of the support rod (30) is 3mm to 10mm.

5. The seed structure for single-crystal blades according to claim 1, characterized in that, The support rod (30) is inserted into the base (40) to a depth of 3mm to 10mm.

6. The seed structure for single-crystal blades according to claim 1, characterized in that, The first part (21) and the second part (22) are connected by welding.

7. The seed structure for single-crystal blades according to claim 1, characterized in that, The support rod (30) is made of ceramic; and / or, The crystal selector (10) is a spiral crystal selector or a seed crystal selector.

8. A blade wax mold module, characterized in that, It includes a base plate (301), a blade wax model (200), and a crystal-leading structure (100) for a single crystal blade as described in any one of claims 1 to 7. There are multiple blade wax models (200), each blade wax model (200) is distributed circumferentially along the base plate (301), and each blade wax model (200) is connected to the base plate (301) through the crystal-leading structure (100).

9. A method for preparing a blade wax model module, for the blade wax model module (300) as described in claim 8, characterized in that, Including the following steps: To prepare a blade wax model, the first part (21) of the crystal-leading transition section (20) and the blade wax model (200) are pressed together by a first mold, and the two ends of the crystal selector (10) are pressed together with the second part (22) of the crystal-leading transition section (20) and the base (40) by a second mold, and the support rod (30) is supported between the second part (22) and the base (40). Combine the blade wax molds and weld the first part (21) and the second part (22) together; Mark the base plate, and mark the position of the base (40) of each of the blade wax molds (200) on the base plate (301); Assemble the blade wax model module by welding the base (40) of each blade wax model (200) to the marked position on the base plate (301).

10. The method for preparing a blade wax model module according to claim 9, characterized in that, The specific steps for setting the marking base plate include: Prepare a marking plate by marking the position of the base (40) of the blade wax model (200) on a plate having the same size as the base plate (301) to form a marking plate; Install the marking plate and attach it to the base plate (301).

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