A module structure and a method for preparing a shell mold

Abstract

An embodiment of the present invention discloses a module structure and a method for preparing a mold shell, including: a pouring cup; a middle column tube wax part, the middle column tube wax part abuts against the inner wall of the pouring cup; a runner plate wax part, connected to the middle column tube wax part so as to form a liquid metal diversion channel between the runner plate wax part and the middle column tube wax part; a chassis, coaxially arranged with the middle column tube wax part, and the chassis is connected to one end of the middle column tube wax part away from the pouring cup; there are multiple single crystal blade wax parts, arranged between the chassis and the runner plate wax part; one end of the single crystal blade wax part is connected to the runner plate wax part, and one end of the spiral crystal selector of the single crystal blade wax part is connected to the chassis. The module structure provided by the present invention connects the runner plate wax part and the chassis together through the middle column tube wax part to form a complete framework system, improves the overall strength of the module structure, and at the same time reduces the force on the single crystal blade wax part to a certain extent during the shell making process, improving the stability and quality of the module structure during the mold shell preparation process.

Description

Technical Field

[0001] The present invention relates to the technical field of precision casting of aircraft engine turbine blades, and more specifically to a module structure and a shell preparation method for preparing a large module shell of a single crystal blade. Background Art

[0002] Turbine blades are one of the most critical hot end components of aircraft engines. The application of single crystal blades has significantly improved the efficiency of the engine and promoted the advancement of aircraft engine technology. Single crystal blade manufacturing technology is one of the key core technologies for the development of aircraft engine technology. Some aviation powers have been investing a lot of resources in the development of process technology. The shell preparation process is one of the important technologies in the blade process system. Before shell preparation, the wax mold module structure needs to be designed first. The wax mold module structure mainly realizes the diversion and filling of liquid metal. At the same time, the strength of the wax mold module structure needs to be considered to ensure the integrity of the wax mold module structure during transportation, shell preparation, and smelting and pouring, and avoid dimensional deformation and damage of the wax mold module structure and castings during transportation and preparation.

[0003] In the prior art, operators prepare the shell by manually applying slurry and sand by holding a wax mold module. This method requires very high operating skills and consistency of movements, so that the consistency and stability of the shell preparation are not ideal. In addition, since the module structure is a small module, the production efficiency is low, and the stability and quality of the shell preparation cannot be guaranteed.

[0004] Therefore, how to improve the stability and quality of shell preparation has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a module structure to improve the stability and quality of shell preparation;

[0006] Another object of the present invention is to provide a method for preparing a mold shell.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A module structure for preparing a large module shell of a single crystal blade, comprising:

[0009] The pouring cup is used to receive the molten metal flow;

[0010] A center column tube wax piece is arranged in the pouring cup, and the center column tube wax piece abuts against the inner wall of the pouring cup;

[0011] A sprue plate wax piece connected to the center column tube wax piece so that a liquid metal diversion channel is formed between the sprue plate wax piece and the center column tube wax piece;

[0012] A chassis is coaxially arranged with the center column wax tube piece, and the chassis is connected to an end of the center column wax tube piece away from the pouring cup;

[0013] There are multiple single crystal blade wax pieces, which are arranged between the chassis and the pouring plate wax piece; one end of the single crystal blade wax piece is connected to the pouring plate wax piece, and one end of the spiral crystal selector of the single crystal blade wax piece is connected to the chassis.

[0014] Optionally, in the above-mentioned module structure, the center column tube wax part includes a first step of the center column tube and a second step of the center column tube; the first step of the center column tube abuts against the inner wall of the pouring cup; the pouring plate wax part is provided with a groove that is clamped with the second step of the center column tube, and the second step of the center column tube is clamped with the groove to form a liquid metal diversion channel.

[0015] Optionally, in the above module structure, a threaded rod is pre-buried inside the center column tube wax piece; the first end of the threaded rod extends out of the pouring cup, and the second end of the threaded rod is connected to the chassis.

[0016] Optionally, in the above-mentioned module structure, the chassis includes a metal core plate and a metal threaded key; the metal threaded key is arranged on one side of the metal core plate, and the second end of the threaded rod extends out of the metal core plate; the other side of the metal core plate locks the metal core plate and the threaded rod through fasteners; the metal threaded key is provided with a plurality of protrusions for engaging with the slots opened on the metal core plate to limit the rotation of the threaded rod.

[0017] Optionally, in the above module structure, a plurality of circular holes are formed on the metal core plate, and the circular holes are used to connect the wax materials on both sides of the metal core plate when the wax mold of the chassis is pressed.

[0018] Optionally, in the above module structure, the runner plate wax piece includes a conical arc surface and a horizontal plane; the horizontal plane is located at the large diameter end of the conical arc surface, and is used for welding connection with the single crystal blade wax piece.

[0019] Optionally, in the above module structure, a plurality of diversion holes are provided on the conical arc surface at intervals.

[0020] Optionally, in the above module structure, a ceramic plug is also included; the ceramic plug is used to seal the cavity of the center column tube wax piece after the shell is prepared.

[0021] Optionally, in the above module structure, the pouring cup is made of alumina or silicon oxide-based ceramics.

[0022] Optionally, in the above module structure, the outer diameter of the sprue plate wax piece is 250 mm to 600 mm; and / or,

[0023] The outer diameter of the chassis is 300 mm to 700 mm.

[0024] A method for preparing a shell mold includes:

[0025] Step A: Prepare a middle column tube wax piece, a runner plate wax piece, and a single crystal blade wax piece, and assemble the prepared middle column tube wax piece, the runner plate wax piece, and the single crystal blade wax piece to form the module structure as described in any one of the above.

[0026] Step B: Clamp the module structure by the clamping end of a robotic arm, and control the module structure to dip slurry and control the slurry; after the slurry control is completed, control the module structure to sand spray and sand control in a sand spraying machine.

[0027] Step C: After the sand control is completed, perform a drying treatment on the module structure.

[0028] Step D: Remove the metal core plate on the chassis, and remove the wax pieces in the module structure. The wax pieces include the runner plate wax piece, the middle column tube wax piece, and the single crystal blade wax piece, so as to form an inner cavity of the shell mold at the positions of the wax pieces, and a liquid metal diversion channel is formed between the runner plate wax piece and the middle column tube wax piece after removal.

[0029] Step E: Bake the shell mold to obtain a finished shell mold.

[0030] Optionally, in the above method for preparing a shell mold, between Step C and Step D, there is also a step: perform Step B and Step C, and repeat n times, where n ≥ 5.

[0031] The module structure provided by the present invention is provided with a pouring cup. The pouring cup has a receiving cavity for liquid metal to flow in, and the middle column tube wax piece is arranged in the receiving cavity of the pouring cup and abuts against the cavity wall of the receiving cavity. The runner plate wax piece is connected to the middle column tube wax piece so as to form a liquid metal diversion channel between the runner plate wax piece and the middle column tube wax piece, facilitating the diversion of liquid metal. The chassis is coaxially arranged with the middle column tube wax piece and is connected to one end of the middle column tube wax piece away from the pouring cup. A plurality of single crystal blade wax pieces are arranged between the chassis and the runner plate wax piece. Among them, the middle column tube wax piece plays a role in connection and load bearing, and the pouring cup, the middle column tube wax piece, the runner plate wax piece, and the chassis form a complete framework system, improving the overall strength of the module structure and reducing the force on the single crystal blade wax pieces to a certain extent, avoiding the deformation of the dimensions of the single crystal blade wax pieces during transportation and preparation, and improving the stability and quality of the entire shell mold preparation.

[0032] Compared with the prior art, the module structure provided by the present invention connects the runner plate wax piece and the chassis together through the middle column tube wax piece, forming a complete framework system, improving the overall strength of the module structure, and at the same time reducing the force on the single crystal blade wax piece to a certain extent during the entire shell-making process, improving the stability and quality of the entire module during the shell mold preparation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0034] Figure 1 is a sectional view of the module structure provided by the embodiment of the present invention;

[0035] Figure 2 is a schematic structural diagram of the module structure provided by the embodiment of the present invention.

[0036] Among them, 1 is a sprue cup, 2 is a middle column tube wax piece, 201 is the first step of the middle column tube, 202 is the second step of the middle column tube, 203 is the ceramic plug step, 3 is a threaded rod, 4 is a runner plate wax piece, 401 is a diversion hole, 5 is a metal threaded key, 6 is a metal core plate, 7 is a chassis, 8 is a fixing nut, 9 is a single crystal blade wax piece, and 10 is a ceramic plug. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The core of the present invention is to provide a module structure to improve the stability and quality of shell mold preparation;

[0038] Another core of the present invention is to provide a method for preparing a shell mold.

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0040] Such as Figure 1 and Figure 2As shown in the figure, an embodiment of the present invention discloses a module structure, including: a sprue cup 1, a middle column tube wax part 2, a runner plate wax part 4, a chassis 7, and a single crystal blade wax part 9. It should be noted that the module structure disclosed in the embodiment of the present invention is a large module structure. Among them, the large module structure is a module structure with the diameter of the chassis 7 generally between 300 mm and 600 mm. And the module structure disclosed in the present invention is mainly applied to the technical field of automatic preparation of the shell by a manipulator. Of course, it can also be applied to other fields. As long as the module structure disclosed in this embodiment is adopted, it is within the protection scope of this application.

[0041] Among them, the sprue cup 1 is a cup-shaped body with a narrowed mouth from top to bottom ( Figure 1 viewpoint), and a receiving cavity for receiving the metal liquid flow is formed in the cup body. It should be noted that the material of the sprue cup 1 is alumina or silica-based ceramic, so that the sprue cup 1 has high temperature resistance. In this embodiment, the sprue cup 1 made of silica-based ceramic material (hereinafter referred to as ceramic sprue cup) is preferably used. Since the high temperature linear expansion coefficient of the ceramic sprue cup matches that of the shell material, the matching of the shell and the ceramic sprue cup during the shell preparation process is ensured, and thus a complete and crack-free sprue and shell are obtained. At the same time, the ceramic sprue cup can effectively prevent impurities and foreign objects from entering the inner cavity of the shell, and avoid defects in the single crystal blade during casting.

[0042] As Figure 1 shown, the middle column tube wax part 2 is arranged in the sprue cup 1, and the middle column tube wax part 2 abuts against the inner wall of the sprue cup 1, and the gap between the middle column tube wax part 2 and the sprue cup 1 is filled with bonding wax to fuse the middle column tube wax part 2 and the sprue cup 1 together. It should be noted that filling the gap between the middle column tube wax part 2 and the sprue cup 1 with bonding wax is to ensure the sealing between the middle column tube wax part 2 and the sprue cup 1, so that the shell formed after dewaxing treatment is more complete, and when pouring liquid metal, it is avoided that the liquid metal flows out from the gap between the middle column tube wax part 2 and the sprue cup 1, resulting in waste of liquid metal.

[0043] Furthermore, the runner plate wax part 4 is connected to the middle column tube wax part 2 so as to form a liquid metal diversion channel between the runner plate wax part 4 and the middle column tube wax part 2. It should be noted that when the runner plate wax part 4 and the middle column tube wax part 2 are subjected to dewaxing treatment, cavities are formed at the positions of the middle column tube wax part 2 and the runner plate wax part 4, so that the cavity of the middle column tube wax part 2 and the cavity of the runner plate wax part 4 are communicated with each other to form a liquid metal diversion channel.

[0044] To make the module structure form an integral framework system and ensure the stability and quality of the investment shell preparation, the chassis 7 and the middle column tube wax part 2 are coaxially arranged. Specifically, the chassis 7 is connected to one end of the middle column tube wax part 2 away from the sprue cup 1, and a plurality of single crystal blade wax parts 9 are arranged between the chassis 7 and the runner plate wax part 4. One end of the single crystal blade wax part 9 is connected to the runner plate wax part 4, and one end of the spiral selector of the single crystal blade wax part 9 is connected to the chassis 7. It should be noted that the single crystal blade wax part 9 is integrated with the runner plate wax part 4 by means of welding combination. At the same time, wax films are coated on the upper and lower planes of the chassis 7 so that the chassis 7 and the single crystal blade wax part 9 can be integrated by means of welding combination, preventing the chassis 7 and the single crystal blade wax part 9 from falling off and being damaged during the transportation and investment shell preparation of the module structure.

[0045] The module structure disclosed by the present invention is provided with a sprue cup 1. The sprue cup 1 has a receiving cavity for liquid metal to flow in. The middle column tube wax part 2 is arranged in the receiving cavity of the sprue cup 1 and abuts against the cavity wall of the receiving cavity. The runner plate wax part 4 is connected to the middle column tube wax part 2 so as to form a liquid metal diversion channel between the runner plate wax part 4 and the middle column tube wax part 2, facilitating the diversion of liquid metal. The chassis 7 and the middle column tube wax part 2 are coaxially arranged and connected to one end of the middle column tube wax part 2 away from the sprue cup 1. A plurality of single crystal blade wax parts 9 are arranged between the chassis 7 and the runner plate wax part 4. Among them, the middle column tube wax part 2 plays a role in connection and load bearing, and the sprue cup 1, the middle column tube wax part 2, the runner plate wax part 4 and the chassis 7 form a complete framework system, improving the overall strength of the module structure and reducing the force on the single crystal blade wax part 9 to a certain extent, avoiding the deformation of the size of the single crystal blade wax part 9 during transportation and preparation, and improving the stability and quality of the entire investment shell preparation.

[0046] Compared with the prior art, the module structure provided by the present invention connects the runner plate wax part 4 and the chassis 7 together through the middle column tube wax part 2 to form a complete framework system, improving the overall strength of the module structure. At the same time, the force on the single crystal blade wax part 9 during the entire shell making process is reduced to a certain extent, improving the stability and quality of the entire module structure during the investment shell preparation process.

[0047] Furthermore, in a specific embodiment, the middle column tube wax part 2 includes a first middle column tube step 201 and a second middle column tube step 202. Specifically, the first middle column tube step 201 abuts against the inner wall of the sprue cup 1, and a circular groove for engaging with the second middle column tube step 202 is provided at the center position of the runner plate wax part 4. The second middle column tube step 202 is engaged with the circular groove to form a liquid metal diversion channel after dewaxing. It should be noted that as Figure 1As shown, in order to ensure a firm connection between the pouring cup 1 and the wax piece 2 of the center column tube, a claw portion is provided at the bottom opening of the pouring cup 1, and an annular recess is provided between the first step 201 of the center column tube and the second step 202 of the center column tube. The claw portion extends into the interior of the annular recess and engages with the annular recess.

[0048] In order to facilitate the robot arm to clamp the module structure, such as Figure 1 As shown, in a specific embodiment, a threaded rod 3 is pre-buried inside the center column wax tube part 2. Specifically, the first end of the threaded rod 3 needs to be exposed from the pouring cup 1 by at least 5 mm, preferably 5 mm in this embodiment, to facilitate the connection between the threaded rod 3 and the shell making robot grasping tooling, and the second end of the threaded rod 3 is connected to the chassis 7. It should be noted that the threaded rod 3 is made of metal, and when the center column wax tube part 2 is prepared, the threaded rod 3 is buried inside the center column wax tube part 2.

[0049] In the above embodiment, the chassis 7 includes a metal core plate 6 and a metal threaded key 5. The metal threaded key 5 is arranged on one side of the metal core plate 6, and the second end of the threaded rod 3 extends out of the metal core plate 6, and the other side of the metal core plate 6 is locked with the metal core plate 6 and the threaded rod 3 by a fastener. The metal threaded key 5 is provided with a plurality of protrusions for engaging with the slots provided on the metal core plate 6 to limit the rotation of the threaded rod 3 during the preparation of the shell, and a plurality of circular holes with a diameter of 4 mm are provided on the metal core plate 6, and the circular holes are arranged corresponding to the single crystal blade wax parts 9, and the circular holes are provided to connect the wax materials on both sides of the metal core plate 6 when the wax mold of the chassis 7 is pressed, so as to improve the adhesion of the wax materials on the metal core plate 6 and avoid deformation of the wax film on the chassis 7. It should be noted that the fastener in this embodiment is a fixing nut 8, which is screwed into the threaded rod 3 to lock the metal core plate 6 and the threaded rod 3.

[0050] In this embodiment, the diameter of the chassis 7 is 400 mm, and it is formed by combining a metal threaded key 5 and a metal core plate 6 and then pressing them in a wax press. The upper and lower surfaces of the metal core plate 6 are coated with a wax film, and are fused with the circular holes opened on the metal core plate 6 to prevent the single crystal blade wax piece 9 from being separated and shrinking when connected to the metal core plate 6. Furthermore, the center column tube wax piece 2 is connected to the metal threaded key 5 on the chassis 7 through the threaded rod 3 to form the overall framework of the module structure, and the chassis 7 and the center column tube wax piece 2 are locked by fasteners to ensure the overall strength and stability of the module structure, so that when the single crystal blade wax piece 9 is combined with the runner plate wax piece 4 and the chassis 7, it is avoided that the single crystal blade wax piece 9 is deformed in size or damaged in the shell due to force during the shell preparation process. It should be noted that after the shell is coated, dewaxed, roasted and polished, a flat shell chassis is formed on the upper surface without deformation. The plane of the shell chassis is in contact with the water cooling plate of the single crystal furnace with no gap in between, which prevents the liquid metal from leaking from the gap between the seeding plate and the water cooling plate during the pouring process, thereby causing the module structure to be scrapped.

[0051] Further, as Figure 2 shown, in a specific embodiment, the outer diameter of the runner plate wax part 4 is 360 mm, and the runner plate wax part 4 includes a conical arc surface and a horizontal surface. Among them, the horizontal surface is located at the large-diameter end of the conical arc surface and is used for welding and combining with the single-crystal blade wax part 9. Specifically, the width of the horizontal surface is 20 mm, the thickness is 10 mm, and the included angle between the conical arc surface and the horizontal surface is 15°, so as to ensure that the liquid metal can flow out of the cavity formed after the dewaxing of the runner plate wax part 4. Moreover, a plurality of diversion holes 401 are spaced apart on the conical arc surface, which is convenient for the liquid metal to flow into the cavity formed after the dewaxing of the single-crystal blade wax part 9 from both sides of the diversion holes 401, so as to form a liquid metal diversion, improve the efficiency of liquid metal pouring, avoid the waste of liquid metal, and at the same time, the setting of the diversion holes 401 increases the contact area of the module structure during slurry sticking and sand spraying, thereby improving the strength of the shell preparation and enhancing the stability and reliability of the module structure. Scale lines and angle lines are also engraved on the horizontal surface of the runner plate wax part 4 to ensure the consistency of the combination of the single-crystal blade wax parts 9.

[0052] In order to prevent the liquid metal from leaking into the cavity formed by the middle column tube wax part 2 during pouring and causing metal waste, in a specific embodiment, as Figure 1 shown, the module structure is further provided with a ceramic plug 10 for plugging the cavity formed by the middle column tube wax part 2 after the shell preparation is completed. Specifically, the ceramic plug 10 includes a ceramic plug step 203, an intermediate cover plate and a cylindrical end. The cylindrical end of the ceramic plug 10 is clamped by a clip for installation, and the cavity formed by the middle column tube wax part 2 is plugged through the cooperation of the intermediate cover plate and the ceramic plug step 203 to prevent the liquid metal from flowing in during pouring.

[0053] Further, the size range of the outer diameter of the runner plate wax part 4 is 250 mm to 600 mm, and the outer diameter of the runner plate wax part 4 disclosed in the embodiment of the present invention is preferably 360 mm. And / or, the size range of the outer diameter of the chassis 7 is 300 mm to 700 mm, and the outer diameter of the chassis 7 disclosed in the embodiment of the present invention is preferably 400 mm.

[0054] The embodiment of the present invention also discloses a method for preparing a shell. The module structure adopted by this method for preparing a shell is the module structure disclosed in the above embodiment. Therefore, this module structure has all the technical effects of the above module structure, which will not be elaborated herein. Among them, the method for preparing a shell includes the following steps:

[0055] Step A, prepare the middle column tube wax part 2, the runner plate wax part 4 and the single-crystal blade wax part 9, and assemble the prepared middle column tube wax part 2, the runner plate wax part 4 and the single-crystal blade wax part 9 to form a module structure.

[0056] Step B: The clamping end of the robotic arm clamps the module structure, and through program control, the module structure performs the actions of slurry dipping and slurry control. After the slurry control is completed, the module structure is controlled to perform sand spraying and sand control in the sand spraying machine.

[0057] Step C: After the sand control is completed, the robotic arm sends the module structure to the drying suspension chain for drying treatment.

[0058] Repeat Step B and Step C in the above steps, and repeat at least 5 times to make the formed shell have a certain strength and prevent the shell from being damaged during the dewaxing process. It should be noted that the more times of repetition, the higher the strength of the formed shell. In this embodiment, the number of repetitions is 6 to 8 times.

[0059] Step D: When the shell has a certain strength, perform a grinding operation on the shell. Specifically, first clean the slurry shell coated on the back of the chassis 7, then remove the fixing nut 8, use external tools to remove the metal core plate 6 on the chassis 7, then clean the remaining residual wax on the chassis 7, and finally transfer it to the dewaxing kettle, and introduce high-temperature and high-pressure steam to remove the wax parts in the module structure, so as to form a complete shell inner cavity at the wax part, and a liquid metal diversion channel is formed after the wax parts of the runner plate 4 and the middle column tube wax part 2 are removed. It should be noted that the wax parts include the runner plate wax part 4, the middle column tube wax part 2, and the single crystal blade wax part 9.

[0060] Step E: Send the shell after removing the wax parts to the roasting furnace for roasting to remove the residual wax material during the dewaxing process, and at the same time partially ceramize the shell to improve the strength of the shell, so as to obtain a complete shell finished product. When the complete shell is prepared, it is then transferred to the single crystal furnace for pouring of liquid metal.

[0061] The shell preparation method disclosed by the present invention uses a robotic arm to clamp the module structure to perform the work of shell preparation, which promotes the development and engineering application of the automated shell-making process.

[0062] The terms "first" and "second" etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may include steps or units not listed.

[0063] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. 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 the present invention. Thus, the present invention is not intended 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 module structure for preparing a large module shell of a single crystal blade. It is characterized in that include: A pouring cup (1) for receiving a flow of molten metal; A center column tube wax piece (2) is arranged in the pouring cup (1), and the center column tube wax piece (2) abuts against the inner wall of the pouring cup (1), and the center column tube wax piece (2) comprises a center column tube first step (201) and a center column tube second step (202); the center column tube first step (201) abuts against the inner wall of the pouring cup (1); a groove is provided on the pouring plate wax piece (4) to be engaged with the center column tube second step (202), and the center column tube second step (202) is engaged with the groove to form a liquid metal diversion channel; a threaded rod (3) is pre-buried inside the center column tube wax piece (2); a first end of the threaded rod (3) extends out of the pouring cup (1), and a second end of the threaded rod (3) is connected to the bottom plate (7); A sprue plate wax piece (4) connected to the center column tube wax piece (2) so that a liquid metal diversion channel is formed between the sprue plate wax piece (4) and the center column tube wax piece (2); A chassis (7) is coaxially arranged with the center column tube wax component (2), and the chassis (7) is connected to an end of the center column tube wax component (2) away from the pouring cup (1); the chassis (7) comprises a metal core plate (6) and a metal threaded key (5); the metal threaded key (5) is arranged on one side of the metal core plate (6), and the second end of the threaded rod (3) extends out of the metal core plate (6); the other side of the metal core plate (6) is fastened to the metal core plate (6) and the threaded rod (3) by a fastener; a plurality of protrusions are arranged on the metal threaded key (5) for engaging with a slot provided on the metal core plate (6) to limit the rotation of the threaded rod (3); a plurality of circular holes are provided on the metal core plate (6), and the circular holes are used to connect the wax material on both sides of the metal core plate (6) when the wax mold of the chassis (7) is pressed; There are multiple single crystal blade wax pieces (9) arranged between the chassis (7) and the pouring plate wax piece (4); one end of the single crystal blade wax piece (9) is connected to the pouring plate wax piece (4), and one end of the spiral crystal selector of the single crystal blade wax piece (9) is connected to the chassis (7); A ceramic plug (10), wherein the ceramic plug (10) is used to seal the cavity of the center column tube wax piece (2) after the shell is prepared.

2. The module structure according to claim 1, It is characterized in that The pouring plate wax piece (4) comprises a conical arc surface and a horizontal surface; the horizontal surface is located at the large diameter end of the conical arc surface and is used for welding connection with the single crystal blade wax piece (9).

3. The module structure according to claim 2, It is characterized in that A plurality of flow diversion holes (401) are arranged at intervals on the conical arc surface.

4. The module structure according to claim 1, It is characterized in that The pouring cup (1) is made of alumina or silicon oxide-based ceramics.

5. The module structure according to claim 1, It is characterized in that The outer diameter of the runner plate wax piece (4) is 250 mm to 600 mm; and / or, The outer diameter of the chassis (7) is 300 mm to 700 mm.

6. A method for preparing a shell mold, Characterized in that, It includes: Step A, prepare a middle column tube wax piece (2), a runner plate wax piece (4) and a single crystal blade wax piece (9), and assemble the prepared middle column tube wax piece (2), the runner plate wax piece (4) and the single crystal blade wax piece (9) to form a module structure as described in any one of claims 1-5; Step B, clamp the module structure by the clamping end of the robotic arm, and control the module structure to dip slurry and control the slurry; after the slurry control is completed, control the module structure to sand spray and sand control in a sand spraying machine; Step C, after the sand control is completed, perform a drying treatment on the module structure; Step D, remove the metal core plate (6) on the chassis (7), and remove the wax pieces in the module structure. The wax pieces include the runner plate wax piece (4), the middle column tube wax piece (2) and the single crystal blade wax piece (9), so as to form a shell mold inner cavity at the wax piece, and a liquid metal diversion channel is formed after the runner plate wax piece (4) and the middle column tube wax piece (2) are removed; Step E, bake the shell mold to obtain a finished shell mold.

7. The method for preparing a shell mold according to claim 6, Characterized in that, There is also a step between step C and step D: perform step B and step C, and repeat n times, n≥5.

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