Method of forming a wax pattern for a hyper-hyperplane integral guider casting

Abstract

The application discloses a forming method of a wax mold of a whole guide with a super-variable cross section, and is used for mold making of a double-layer bidirectional structure guide, wherein the double-layer bidirectional structure guide comprises an inner ring, an outer ring and a blade ring with a super-variable cross section; the blade ring of the double-layer bidirectional structure guide is extracted as a support body wax mold with a small variable cross section, and the support body wax mold is poured twice to form the blade ring wax mold with the super-variable cross section; the blade ring wax mold is integrally taken out in a linkage mode of movable blocks, the forming precision and the working efficiency are effectively improved, meanwhile, the inner ring wax mold and the outer ring wax mold are integrally formed by using die pressing, then the blade ring wax mold, the outer ring wax mold and the inner ring wax mold are combined and spliced, the spliced seams are welded and fixed, and thus the mold making of the double-layer bidirectional structure guide is completed. By using the method, only the blade ring wax mold, the inner ring wax mold and the outer ring wax mold need to be combined and spliced, the assembling difficulty is greatly reduced, the spliced seams are few, and the castings are high in precision and good in quality.

Description

Technical Field

[0001] This invention relates to the field of precision casting technology, and in particular, to a method for forming a wax model of an integral guide casting with a super-variable cross-section. Background Technology

[0002] The guide vane is a crucial component of aero-engines. Conventional guide vanes are primarily double-layered unidirectional. A double-layered unidirectional guide vane consists of a wax block and inner and outer rings with straight-through flow channels and their mounting edges. The inner and outer rings are connected by the wax block to form a single double-layered unidirectional structure. However, with the continuous improvement of aero-engine requirements for guide vane performance and lifespan, precision guide vane castings are gradually developing towards integration, generally exhibiting characteristics such as complexity and lack of margin. For example... Figure 1 As shown, the guide vane for a certain aero-engine is a typical large, complex, integral precision casting with a super-variable cross section. It is a double-layer, bidirectional structure guide vane, mainly composed of vertical blades with a super-variable cross section and inner and outer ring double-layer L-shaped flow channels and their mounting edges. The thick inner ring and thin-walled outer ring are connected by vertical blades with a super-variable cross section to form an integral structure with a super-variable cross section. This casting has a high degree of integration, a compact and complex structure, and the casting process is drastically more difficult.

[0003] Currently, the molding process for aero-engine guide vanes is mostly achieved through unit blade assembly. This involves dividing the parts, creating wax models of the unit blades using molds, assembling them, applying wax cladding to the weld seams, and finally grinding and finishing to achieve the final wax model. However, conventional guide vanes are mostly horizontally arranged, while the blades of double-layer bidirectional guide vanes are vertically arranged, resulting in a different flow channel surface compared to conventional guide vanes. Furthermore, the outer ring of the double-layer bidirectional guide vane extends more prominently, leading to a noticeable deep groove feature in the casting structure. If the existing traditional assembly wax model method is used to mold the double-layer bidirectional guide vane, after casting, the weld seams of the flow channel surface need to be ground to ensure surface smoothness due to surface quality requirements. However, because the flow channel surface of the double-layer bidirectional guide vane is an L-shaped cavity, the grinding angle is limited, making it impossible to meet the grinding requirements of the flow channel surface, resulting in the product failing to meet design requirements. Summary of the Invention

[0004] This invention provides a molding method for a wax model of an integral guide casting with a super-variable cross-section, in order to solve the technical problem of poor dimensional accuracy in the molding of integral guides in the prior art.

[0005] According to one aspect of the present invention, a method for forming an integral casting of a super-variable cross-section guide is provided for molding a double-layer bidirectional structure guide, the double-layer bidirectional structure guide including an inner ring, an outer ring, and a blade ring having a super-variable cross-section, comprising the following steps:

[0006] a. Prefabricated support wax model: Inject wax into the first mold, press the support wax model into shape in the first mold, and remove the support wax model after it has cooled.

[0007] b. Fabrication of the blade ring wax model: The pre-made support wax model is placed into the second mold, and wax material is injected into the second mold. The support wax model forms the first blade ring and blade assembly through the wrapping of wax material and the pressing of the second mold. At the same time, the wax material at the end of the second mold away from the first blade ring is pressed to form the second blade ring. The first blade ring, the second blade ring, and the blade assembly are formed in one step in the second mold to form an integral blade ring wax model. The second mold adopts a movable block linkage mold so that the formed blade ring wax model can be demolded as a whole by the movable block linkage after cooling.

[0008] c. Pressing the inner ring wax mold: Inject wax into the third mold to form the inner ring wax mold in the third mold. After the inner ring wax mold has cooled, remove it from the mold.

[0009] d. Pressing the outer ring wax mold: Inject wax into the fourth mold to form the outer ring wax mold. After the outer ring wax mold has cooled, remove it from the mold.

[0010] e. Assembly: Position and assemble the prefabricated blade ring wax model, inner ring wax model, and outer ring wax model, and weld and fix the joints formed between the assembled blade ring wax model, inner ring wax model, and outer ring wax model to complete the molding of the double-layer bidirectional structure guide.

[0011] Furthermore, the support wax model includes a support ring, a cold wax block unit, and a simple body blade unit. The support ring is arranged between the cold wax block unit and the simple body blade unit. Multiple cold wax block units and simple body blade units are evenly arranged along the circumference of the support ring. The support ring, the cold wax block unit, and the simple body blade unit are integrally formed.

[0012] Furthermore, the first blade ring is formed by casting the support ring and cold wax block unit of the support wax mold into the second mold and pressing them together with wax material. The blade assembly is formed by casting the simple blade unit of the support wax mold into the second mold and pressing it together with wax material. The second blade ring is formed by pressing the cast wax material into the second mold. The first blade ring, the blade assembly and the second blade ring are integrally formed.

[0013] Furthermore, the inner wall of the first blade ring is provided with a first splicing part, and the outer wall of the second blade ring is provided with a groove along the circumferential direction.

[0014] Furthermore, the movable block linkage mold includes a mold cavity for accommodating the blade ring wax mold, a movable block unit for controlling the opening and closing of the mold cavity, and a rotary brake for controlling the rotation direction of the movable block unit. The movable block unit includes an inner ring movable block and an outer ring movable block. The rotary brake includes a rotary brake disc, a movable block guide rail arranged on the rotary brake disc, and a control lever fixedly connected to the outer wall of the rotary brake disc. The inner ring movable block and the outer ring movable block are arranged radially along the outer periphery of the mold cavity and move along the movable block guide rail.

[0015] Furthermore, the inner ring wax mold includes a first inner ring and a second inner ring, which are coaxially arranged and integrally formed.

[0016] Furthermore, the end of the second inner ring away from the direction of the first inner ring extends radially outward, and the outer wall of the second inner ring is provided with a second splicing part for splicing with the first splicing part of the first blade ring.

[0017] Furthermore, the outer ring wax mold includes a first outer ring and a second outer ring, the first outer ring and the second outer ring being coaxially arranged and integrally formed.

[0018] Furthermore, the end of the second outer ring away from the direction of the first outer ring extends radially inward, and the inner sidewall of the second outer ring is provided with a protrusion in the circumferential direction for engaging with the groove of the second blade ring.

[0019] Furthermore, the blade ring wax mold and the inner ring wax mold are assembled by splicing the first splicing part and the second splicing part, and the blade ring wax mold and the outer ring wax mold are assembled by the snap-fit ​​of the groove and the protrusion. A first splicing seam is formed between the first splicing part and the second splicing part, and a second splicing seam is formed between the groove and the protrusion. Both the first splicing seam and the second splicing seam are fixed by welding.

[0020] The present invention has the following beneficial effects:

[0021] This invention discloses a molding method for an integral casting of a super-variable cross-section guide, used for molding a double-layer bidirectional structure guide. The double-layer bidirectional structure guide includes an inner ring, an outer ring, and a blade ring with a super-variable cross-section. This invention extracts the blade ring of the double-layer bidirectional structure guide into a support wax model with a small variable cross-section, and then performs a secondary casting on the pre-made support wax model to form a blade ring wax model with a super-variable cross-section. The support wax model serves as the support skeleton of the blade ring wax model and does not directly form the surface of the double-layer bidirectional structure guide. Therefore, the molding precision requirement of the support wax model is not too high, making it easy to operate. Furthermore, the support wax model is equipped with risers, which can avoid shrinkage deformation at the thicker structural parts of the blade ring wax model when molding the support wax model into the blade ring wax model. Compared with existing technologies, the blade ring wax mold of this invention adopts an integral blade ring, eliminating the need to sequentially splice and position multiple blades, reducing labor intensity and effectively improving mold-making efficiency. Furthermore, the integral constraint between the blade and the inner and outer flow channels effectively reduces shrinkage deformation in thin and thick sections. Simultaneously, the blade ring wax mold is integrally molded, eliminating weld seams and avoiding dimensional accuracy deviations caused by the hot and cold processes during wax welding between blade units, resulting in higher molding accuracy. It also eliminates the need for grinding the flow channel surface, ensuring its integrity, extending cycle life, and preventing surface damage, thus improving the surface quality of the blade ring wax mold. Moreover, the blade ring wax mold adopts... Using a modular, interlocking demolding method can shorten the pressing time of the blade ring wax mold. This method divides the double-layer bidirectional guide into three parts: the blade ring wax mold, the inner ring wax mold, and the outer ring wax mold. Each wax mold is integrally formed by the mold, which is convenient for processing. The blade ring wax mold is demolded using a modular, interlocking method, which has high demolding efficiency and accuracy. Moreover, the double-layer bidirectional guide can be integrally formed simply by assembling the blade ring wax mold, the inner ring wax mold, and the outer ring wax mold, which greatly reduces the assembly difficulty. In addition, there are fewer splicing seams in this method, which can ensure that the molded wax mold can meet the design requirements for dimensional accuracy and surface roughness. The operation is simple and easy to implement.

[0022] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 This is a cross-sectional schematic diagram of a double-layer bidirectional structure guide according to a preferred embodiment of the present invention;

[0025] Figure 2This is a schematic diagram of the wax mold assembly of the double-layer bidirectional structure guide according to a preferred embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the support wax model according to a preferred embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the blade ring wax mold according to a preferred embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the inner ring wax mold of a preferred embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the outer ring wax mold of a preferred embodiment of the present invention;

[0030] Figure 7 This is a cross-sectional schematic diagram of the wax model after assembly according to a preferred embodiment of the present invention.

[0031] Legend:

[0032] 100. Double-layer bidirectional structure guide; 101. Inner ring; 102. Outer ring; 103. Blade ring; 200. Support wax model; 201. Cold wax block unit; 202. Support ring; 203. Simple blade unit; 300. Blade ring wax model; 301. First blade ring; 302. Second blade ring; 303. Blade assembly; 400. Inner ring wax model; 401. First inner ring; 402. Second inner ring; 500. Outer ring wax model; 501. First outer ring; 502. Second outer ring; 600. First splicing seam; 700. Second splicing seam. Detailed Implementation

[0033] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0034] like Figure 1 As shown, the present invention discloses a molding method for a wax model of an integral guide casting with a super-variable cross-section, used for molding a double-layer bidirectional structure guide 100. The double-layer bidirectional structure guide 100 includes an inner ring 101, an outer ring 102, and a blade ring 103 with a super-variable cross-section. The method includes the following steps:

[0035] a. Prefabricated support wax mold 200: Inject wax material into the first mold, so that the support wax mold 200 is pressed and formed in the first mold. After the formed support wax mold 200 cools down, it is demolded.

[0036] b. Making the blade ring wax model 300: The pre-made support wax model 200 is placed into the second mold, and wax material is injected into the second mold. The support wax model 200 forms the first blade ring 301 and the blade assembly 303 by being wrapped by the wax material and pressed by the second mold. At the same time, the wax material at the end of the second mold away from the first blade ring 301 is pressed to form the second blade ring 302. The first blade ring 301, the second blade ring 302 and the blade assembly 303 are formed in the second mold in one step to form the integral blade ring wax model 300. The second mold adopts a movable block linkage mold so that the blade ring wax model 300 is demolded as a whole by the movable block linkage after cooling.

[0037] c. Pressing the inner ring wax mold 400: Inject wax into the third mold to form the inner ring wax mold 400 in the third mold. After the inner ring wax mold 400 is cooled, remove it from the mold.

[0038] d. Pressing the outer ring wax mold 500: Inject wax into the fourth mold to form the outer ring wax mold 500 in the fourth mold. After the outer ring wax mold 500 has cooled, remove it from the mold.

[0039] e. Assembly: The prefabricated blade ring wax mold 300, inner ring wax mold 400 and outer ring wax mold 500 are positioned and assembled, and the joints formed between the assembled blade ring wax mold 300, inner ring wax mold 400 and outer ring wax mold 500 are welded and fixed to complete the molding of the double-layer bidirectional structure guide 100.

[0040] This invention extracts the blade ring of the double-layer bidirectional structure guide 100 into a support wax mold 200 with a small variable cross-section. Then, the pre-made support wax mold 200 is cast a second time to form a blade ring wax mold 300 with a super variable cross-section. The support wax mold 200 serves as the support skeleton of the blade ring wax mold 300 and does not directly form the surface of the double-layer bidirectional structure guide 100. Therefore, the molding precision requirement of the support wax mold 200 is not too high, making it easy to operate. In addition, the support wax mold 200 is provided with risers, which can avoid shrinkage deformation at the thicker parts of the blade ring wax mold 300 when molding the blade ring wax mold 300 with the support wax mold 200. The blade ring wax model 300 adopts an integral blade ring, eliminating the need to sequentially splice and position multiple blades, reducing labor intensity and effectively improving molding efficiency. This method disassembles the double-layer bidirectional structure guide 100 into three parts: the blade ring wax model 300, the inner ring wax model 400, and the outer ring wax model 500. Each wax model is integrally formed by a mold, making processing convenient. The blade ring wax model 300 uses a movable block linkage method for demolding, resulting in high demolding efficiency and precision. Moreover, the double-layer bidirectional structure guide 100 can be integrally formed simply by assembling the blade ring wax model 300, the inner ring wax model 400, and the outer ring wax model 500, greatly reducing assembly difficulty. Furthermore, this method results in fewer splicing seams, ensuring that the molded wax model meets the design requirements for dimensional accuracy and surface roughness.

[0041] like Figure 1 As shown, the support wax model 200 is a simple body with a small variable cross-section extracted from the internal structure of the double-layer bidirectional structure guide 100. In use, the support wax model 200 needs to be pre-formed using a first mold, cooled, and then placed in a second mold as a support skeleton for secondary casting to form a blade ring wax model 300 with a super-variable cross-section. Specifically, the support wax model 200 includes a cold wax block unit 201, a simple blade unit 203, and a support ring 202. The support ring 202 is a thin-plate ring structure, serving as a connector between the cold wax block unit 201 and the simple blade unit 203. Multiple cold wax block units 201 and simple blade units 203 are arranged along the circumference of the support ring 202. Multiple cold wax block units 201, simple blade units 203, and support ring 202 are integrally formed in the first mold by pouring wax.

[0042] In the molding of precision castings, the main function of risers is to compensate for the shrinkage of the wax in the mold and the shrinkage during solidification, in order to obtain precision castings without shrinkage cavities. When the wax pattern cools in the mold, the thinnest part solidifies first, and its shrinkage can be compensated by the nearby thicker parts. When the thicker parts solidify, if they do not receive external compensation, large shrinkage cavities will form. In this case, the role of the riser is to compensate for the last part of the wax pattern to solidify, so the riser should be placed above or to the side of the thicker part of the wax pattern. The internal structure with a highly variable cross-section in the double-layer bidirectional guide 100 is extracted into a simple body with a small variable cross-section to form a support wax model 200. On the one hand, the support wax model 200 serves as the support skeleton for the blade ring wax model 300 and does not directly form the surface of the double-layer bidirectional guide 100. Therefore, the molding precision requirement for the support wax model 200 is not too high, making it easy to operate. On the other hand, multiple cold wax block units 201 are set on the support wax model 200, spaced circumferentially along the support ring 202 to form riser necks. The cold wax block units 201 are set to press the riser necks of the cold wax block units 201 together with the wax material during the molding process of forming the blade ring wax model 300 by secondary casting of the support wax model 200. This avoids shrinkage deformation caused by inconsistent solidification times between thicker and thinner parts of the wax model during molding, improving the consistency of the mold assembly. Optionally, the cross-sectional shape of the cold wax block is trapezoidal or rectangular. The support wax mold 200 is a small-section-variable cavity extracted from the internal structure of the double-layer bidirectional structure guide 100. It is used for secondary casting to form a blade ring wax mold 300 with a super-variable cross-section. Specifically, the cold wax block unit 201 of the support wax mold 200 is used to form the first blade ring 301 of the blade ring wax mold 300. The first blade is relatively thick, which easily leads to large shrinkage during molding, resulting in reduced molding accuracy. Therefore, in order to improve the supply of wax to the riser, locally thickened cold wax block units 201 are provided on the support wax mold 200. Optionally, other technical measures can also be used to improve the riser's feeding efficiency, such as adding an insulation sleeve or heating sleeve around the riser to slow down the solidification rate of the riser and reduce the riser size; or heating the top of the riser with an electric arc or flame to slow down its solidification rate and improve the riser's feeding efficiency.

[0043] like Figure 1As shown, the first blade ring 301 is formed by casting wax material into a second mold and pressing it with the support ring 202 of the support wax mold 200 and the cold wax block unit 201. The blade assembly 303 is formed by casting wax material into a second mold and pressing it with the simple blade unit 203 of the support wax mold 200. The second blade ring 302 is formed by pressing cast wax material into a second mold. The first blade ring 301, the blade assembly 303 and the second blade ring 302 are integrally formed. The second mold has a cavity for forming the blade ring wax mold 300, including a first structural cavity for accommodating the support wax mold 200 and a second structural cavity for pressing the second blade ring 302 of the blade ring wax mold 300. Specifically, after the pre-made support wax mold 200 is cooled, it is placed in the first structural cavity of the second mold, and then wax is injected into the second mold, so that the wax completely covers the support wax mold 200 and fills the first and second structural cavities. Thus, through the covering of the support wax mold 200 by the wax and the pressing of the second structural cavity, the support wax mold 200 is formed in the second structural cavity into the first blade ring 301 of the blade ring wax mold 300 and the blade assembly 303 with a super-variable cross section. The wax in the first structural cavity is pressed and formed into the second blade ring 302 of the blade ring wax mold 300.

[0044] The second mold adopts a movable linkage mold. The movable linkage mold includes a mold cavity for accommodating the blade ring wax mold 300, a movable block unit for controlling the opening and closing of the mold cavity, and a rotary brake for controlling the rotation direction of the movable block unit. The movable block unit includes an inner ring movable block and an outer ring movable block. The rotary brake includes a rotary brake disc, a movable block guide rail arranged on the rotary brake disc, and a control lever fixedly connected to the outer wall of the rotary brake disc. The inner ring movable block and the outer ring movable block are arranged radially along the outer periphery of the mold cavity and move along the movable block guide rail.

[0045] Specifically, by moving the control lever, all outer ring movable blocks move radially away from the mold cavity along the movable block track to open the mold cavity, allowing the support wax block to be placed into the mold cavity. Then, by moving the control lever in the opposite direction, all outer ring movable blocks move radially towards the mold cavity along the movable block track to close the mold cavity, allowing wax material to be injected into the mold cavity to wrap the support wax mold 200. Through the wrapping of the support wax mold 200 by the wax material and the pressing of the mold cavity, the blade ring wax mold 300 is formed in the mold cavity in one go. Then, by moving the control lever, all outer ring movable blocks move radially away from the mold cavity along the movable guide rail to open the mold cavity, allowing the formed blade ring wax mold 300 to be demolded as a whole.

[0046] like Figure 1As shown, the inner wall of the first blade ring 301 is provided with a first splicing part. Preferably, the first splicing part is a trapezoidal sawtooth step, which is used to splice with the blade ring wax mold 300 for mold assembly. The second blade ring 302 is provided with a groove, which is evenly distributed along the circumference of the outer wall of the second blade ring 302 for splicing with the outer ring wax mold 500 for mold assembly.

[0047] like Figure 1 As shown, the inner ring wax mold 400 includes a first inner ring 401 and a second inner ring 402. The first inner ring 401 and the second inner ring 402 have the same inner diameter and are coaxially arranged. The first inner ring 401 and the second inner ring 402 are integrally formed by pressing in a third mold. The end of the second inner ring 402 away from the direction of the first inner ring 401 extends radially outward. The outer side wall of the second inner ring 402 is provided with a second splicing part, which is used to splice with the first splicing part of the first blade ring 301 to perform splicing and assembly of the inner ring wax mold 400 and the blade ring wax mold 300. Preferably, the second splicing part is a trapezoidal serrated step that matches the first splicing part. The interlocking of the trapezoidal serrated steps makes the splicing structure between the second inner ring 402 and the first inner ring 401 more stable and has a high degree of fit. This can effectively reduce the gap between the splices and achieve rapid and accurate axial positioning between the inner ring wax mold 400 and the blade ring wax mold 300, ensuring the coaxiality of the installation.

[0048] like Figure 1 As shown, the outer ring wax mold 500 includes a first outer ring 501 and a second outer ring 502. The first outer ring 501 and the second outer ring 502 have the same outer diameter and are coaxially arranged. The first outer ring 501 and the second outer ring 502 are integrally formed by pressing in a fourth mold. The end of the second outer ring 502 away from the first outer ring 501 extends radially inward. The inner sidewall of the second outer ring 502 is provided with protrusions along the circumferential direction. The protrusions are evenly distributed along the end of the extension surface of the second outer ring 502 and are adapted to the groove at the end of the extension surface of the second blade ring 302 of the blade ring wax mold 300 for snap-fit ​​splicing. The snap-fit ​​connection using the groove and protrusion method makes the splicing structure between the second outer ring 502 and the second blade ring 302 more stable and has a high degree of fit. It can effectively reduce the gap between the splices and achieve rapid and accurate radial positioning between the outer ring wax mold 500 and the blade ring wax mold 300, ensuring the installation accuracy.

[0049] like Figure 1As shown, the blade ring wax mold 300 and the inner ring wax mold 400 are assembled together by splicing the first splicing part and the second splicing part to form the first splicing seam 600. The first splicing seam 600 is located on the inner circumference of the blade of the double-layer bidirectional structure guide 100. The first splicing seam 600 can be welded to the upper and lower end faces of the second inner ring 402 of the inner ring wax mold 400, which is easy to operate. The blade ring wax mold 300 and the outer ring wax mold 500 are assembled together by the snap-fit ​​of the groove and the protrusion to form the second splicing seam 700. Both the first splicing seam 600 and the second splicing seam 700 are fixed by welding. The second splicing seam 700 is located on the outer circumference of the blade of the double-layer bidirectional structure guide 100. The second splicing seam 700 can be welded to the lower end face of the outer ring wax mold 500 and the upper end face of the extended surface of the second outer ring 502, which is easy to operate. The method of this invention only requires disassembling the double-layer bidirectional structure guide 100 into three parts: an inner ring wax mold 400, an outer ring wax mold 500, and a blade ring wax mold 300. The mold is then formed by positioning and welding these three parts together. Only two seams are formed between the inner ring wax mold 400, the outer ring wax mold 500, and the blade ring wax mold 300. This minimizes the number of seams, and the location of these seams facilitates welding without damaging the surface, thus improving the surface quality of the blade ring wax mold 300. Furthermore, the seams are not located on the flow channel surface, avoiding the need for grinding and ensuring the integrity of the flow channel surface. The resulting double-layer bidirectional structure guide 100 has high working efficiency and a long service life. Optionally, high-temperature brazing, argon arc welding, or other welding methods can be used.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for forming a wax model of an integral guide casting with a super-variable cross-section, used for molding a double-layer bidirectional structure guide (100), the double-layer bidirectional structure guide (100) comprising an inner ring (101), an outer ring (102), and a blade ring (103) with a super-variable cross-section, characterized in that, Includes the following steps: a. Prefabricated support wax mold (200): Inject wax into the first mold to press the support wax mold (200) into shape in the first mold. After the support wax mold (200) is cooled, remove it from the mold. b. Fabrication of the blade ring wax model (300): The pre-fabricated support wax model (200) is placed into the second mold, and wax material is injected into the second mold. The support wax model (200) forms the first blade ring (301) and the blade assembly (303) through the wrapping of wax material and the pressing of the second mold. At the same time, the wax material at the end of the second mold away from the first blade ring (301) is pressed to form the second blade ring (302). The first blade ring (301), the second blade ring (302), and the blade assembly (303) are formed in the second mold in one step to form the integral blade ring wax model (300). The second mold adopts a movable block linkage mold so that the formed blade ring wax mold (300) can be demolded as a whole by the movable block linkage method after cooling. c. Pressing the inner ring wax mold (400): Inject wax into the third mold to form the inner ring wax mold (400) in the third mold. After the inner ring wax mold (400) is cooled, remove it from the mold. d. Pressing the outer ring wax mold (500): Inject wax into the fourth mold to form the outer ring wax mold (500) in the fourth mold. After the outer ring wax mold (500) is cooled, remove it from the mold. e. Assembly: The prefabricated blade ring wax mold (300), inner ring wax mold (400), and outer ring wax mold (500) are positioned and assembled, and the joints formed between the assembled blade ring wax mold (300), inner ring wax mold (400), and outer ring wax mold (500) are welded and fixed to complete the molding of the double-layer bidirectional structure guide (100); The support wax model (200) includes a support ring (202), a cold wax block unit (201), and a simple body blade unit (203). The support ring (202) is disposed between the cold wax block unit (201) and the simple body blade unit (203). The cold wax block unit (201) and the simple body blade unit (203) are evenly distributed in multiples along the circumference of the support ring (202), and the support ring (202), the cold wax block unit (201) and the simple body blade unit (203) are integrally formed. The first blade ring (301) is formed by casting wax material into a second mold and pressing the support ring (202) and cold wax block unit (201) of the support wax mold (200) together. The blade assembly (303) is formed by casting wax material into a second mold and pressing the simple blade unit (203) of the support wax mold (200) together. The second blade ring (302) is formed by pressing cast wax material into a second mold. The first blade ring (301), the blade assembly (303), and the second blade ring (302) are integrally formed.

2. The method for forming a wax model of an integral guide casting with a variable cross-section according to claim 1, characterized in that, The inner wall of the first blade ring (301) is provided with a first splicing part, and the outer wall of the second blade ring (302) is provided with a groove along the circumferential direction.

3. The method for forming a wax model of an integral guide casting with a variable cross-section according to claim 1, characterized in that, The movable block linkage mold includes a mold cavity for accommodating the blade ring wax mold (300), a movable block unit for controlling the opening and closing of the mold cavity, and a rotary brake for controlling the rotation direction of the movable block unit. The movable block unit includes an inner ring movable block and an outer ring movable block. The rotary brake includes a rotary brake disc, a movable block guide rail arranged on the rotary brake disc, and a control lever fixedly connected to the outer wall of the rotary brake disc. The inner ring movable block and the outer ring movable block are arranged radially along the outer periphery of the mold cavity and move along the movable block guide rail.

4. The molding method for the wax model of the integral guide casting with super-variable cross-section according to claim 2, characterized in that, The inner ring wax mold (400) includes a first inner ring (401) and a second inner ring (402), wherein the first inner ring (401) and the second inner ring (402) are coaxially arranged and integrally formed.

5. The method for forming a wax model of an integral guide casting with a super-variable cross-section according to claim 4, characterized in that, The end of the second inner ring (402) away from the first inner ring (401) extends radially outward, and the outer side wall of the second inner ring (402) is provided with a second splicing part for splicing with the first splicing part of the first blade ring (301).

6. The method for forming a wax model of an integral guide casting with a super-variable cross-section according to claim 5, characterized in that, The outer ring wax mold (500) includes a first outer ring (501) and a second outer ring (502), wherein the first outer ring (501) and the second outer ring (502) are coaxially arranged and integrally formed.

7. The method for forming a wax model of an integral guide casting with a super-variable cross-section according to claim 6, characterized in that, The end of the second outer ring (502) away from the first outer ring (501) extends radially inward, and the inner sidewall of the second outer ring (502) is provided with a protrusion in the circumferential direction for engaging with the groove of the second blade ring (302).

8. The method for forming a wax model of an integral guide casting with a super-variable cross-section according to claim 7, characterized in that, The blade ring wax mold (300) and the inner ring wax mold (400) are assembled by splicing the first splicing part and the second splicing part, and the blade ring wax mold (300) and the outer ring wax mold (500) are assembled by snapping the groove and the protrusion. A first splicing seam (600) is formed between the first splicing part and the second splicing part, and a second splicing seam (700) is formed between the groove and the protrusion. Both the first splicing seam (600) and the second splicing seam (700) are fixed by welding.

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