A casting method of a hollow thin-walled inclined support plate machine case and the machine case

Abstract

The present application relates to the technical field of casting, in particular to a kind of hollow thin-walled inclined support plate machine case casting method and the machine case.The method includes manufacturing wax mold assembly according to the shape and size of machine case semi-finished product;Wax mold assembly is made into mold shell assembly by coating slurry;Wax mold assembly in mold shell assembly is removed;The mold shell assembly after removing wax mold assembly is poured to pour into the machine case semi-finished product;Clean the mold shell assembly on machine case semi-finished product;First sealing plate is welded with machine case semi-finished product to block first coating hole;Second sealing plate is welded with machine case semi-finished product to block second coating hole;Machine case semi-finished product is post-treated to make machine case finished product.In this way, the problem that slurry is difficult to fully enter machine case wax mold inner cavity in coating mold shell process is solved.

Description

Technical Field

[0001] This invention relates to the field of casting technology, and more specifically, to a casting method for a hollow thin-walled inclined support plate casing and the casing itself. Background Technology

[0002] In the composition of aircraft power and transmission systems, the casing is a core load-bearing and protective component, responsible for housing key parts such as bearings, gears, and blades, separating different functional cavities, and ensuring the coordinated operation of various components. Currently, the industry commonly uses investment casting to manufacture aircraft casings. The investment casting process includes steps such as creating a wax model, applying the wax coating, dewaxing, pouring, and shell removal. During wax model creation, a wax model matching the shape of the cast product needs to be produced. Some types of casings have a hollow long support plate structure, forming a hollow thin-walled structure. The inner cavity of the long support plate is narrow, and one end may be closed, making it difficult for the slurry to fully enter the inner cavity of the long support plate during the coating process. Typically, an additional slurry opening is added to facilitate slurry entry into the inner cavity of the long support plate. After casting, the slurry opening is welded and sealed. The slurry opening size is small, and the wall thickness of the long support plate is thin, so the welding strength does not easily affect the overall structural strength.

[0003] However, for larger casings, in order to improve yield and minimize the outer diameter during molding, the gating system is often placed between the support plates. The gating system typically passes through the gaps between multiple long support plates, obstructing the slurry application openings. Slurry still struggles to enter the inner cavity of the long support plates, resulting in insufficient slurry application. Therefore, casings with hollow, thin-walled structures do not achieve sufficient slurry coating during the mold shell process, affecting the casting quality of the product. Summary of the Invention

[0004] To address the problem of insufficient slurry penetration into the inner cavity of the casing wax mold during the coating process, this invention provides a casting method for a hollow thin-walled inclined support plate casing and the casing itself.

[0005] In a first aspect, this application provides a casting method for a hollow thin-walled inclined support plate casing, the casting method of which includes:

[0006] A wax model assembly is manufactured according to the shape and size of the semi-finished casing. The semi-finished casing includes an inner ring, an outer ring, and a support plate. The inner ring and the outer ring are concentrically arranged. Multiple support plates are arranged around the axis of the inner ring. One end of the support plate is connected to the inner ring, and the other end is connected to the outer ring. The support plate includes a hollow shell. The shell is provided with a first coating hole and a second coating hole. The multiple first coating holes and multiple second coating holes in the semi-finished casing are alternately distributed around the axis of the inner ring. The opening area of ​​the first coating hole is larger than the opening area of ​​the second coating hole.

[0007] The wax mold assembly is coated with a slurry to form a molding shell assembly;

[0008] Remove the wax mold assembly from the shell assembly;

[0009] The shell assembly from which the wax mold assembly has been removed is cast to form the semi-finished casing.

[0010] Clean the housing assembly from the semi-finished casing;

[0011] The first sealing plate is welded to the semi-finished casing to seal the first coating hole;

[0012] The second sealing plate is welded to the semi-finished casing to seal the second coating hole;

[0013] The semi-finished casing is post-processed to produce the finished casing.

[0014] In some embodiments, welding the first sealing plate to the semi-finished casing to seal the first coating hole includes:

[0015] The welding device welds the first sealing plate to the semi-finished casing from the outside of the support plate;

[0016] The welding device is inserted through the second coating hole into the inner cavity of the support plate, and the first sealing plate is welded to the support plate on the side facing the inside of the support plate to seal the first coating hole.

[0017] In some embodiments, the inner ring is provided with a first through hole that corresponds to and communicates with the support plate; the outer ring is provided with a second through hole that corresponds to and communicates with a portion of the support plate; the first through hole is used for the flow of gas or oil; the second through hole is used for the flow of gas or oil; in the support plate that communicates with the second through hole, the first coating hole is located at the middle position between the first through hole and the second through hole.

[0018] In some embodiments, one end of the support plate connected to the outer ring is closed; in the support plate with one end connected to the outer ring closed, the distance from the first coating hole to the outer ring is less than the distance from the first coating hole to the inner ring.

[0019] In some embodiments, coating the wax mold assembly with a slurry to form a molding shell assembly includes:

[0020] The wax mold assembly is coated with slurry in a coating motion posture to form a mold shell assembly; when the wax mold assembly is in the coating motion posture, the axis of the inner ring is set horizontally, the wax mold assembly rotates around the axis of the inner ring, and the side of the first coating hole facing the outside of the support plate is in the same direction as the movement direction of the support plate.

[0021] In some embodiments, the process of applying a slurry to the wax model assembly in a coating motion to form a molding shell assembly includes:

[0022] The wax model assembly is coated with slurry in a coating motion to form a contoured shell; the inner cavity shape of the contoured shell is the same as the shape of the wax model assembly.

[0023] A reinforcing rib is placed at the position corresponding to the first coating hole on the molded shell, and slurry is continued to be applied to form a molded shell assembly; the reinforcing rib is located on the side of the first coating hole facing the outside of the support plate; the molded shell assembly includes the molded shell, the reinforcing rib, and the reinforced shell that are fixedly connected; the reinforced shell is attached to the surface of the reinforcing rib.

[0024] In some embodiments, the reinforcing rib is annular; the annular outline of the reinforcing rib coincides with the outline of the first coating hole.

[0025] In some embodiments, the length direction of the first coating hole is parallel to the length direction of the support plate.

[0026] In some embodiments, the post-processing includes polishing and heat treatment.

[0027] In a second aspect, this application provides a hollow thin-walled inclined support plate casing, which is manufactured using the casting method described in any one of the first aspects;

[0028] The hollow thin-walled inclined support plate casing includes:

[0029] Inner ring;

[0030] The outer ring, and the inner ring are concentrically arranged with the outer ring;

[0031] A support plate, wherein multiple support plates are arranged around the axis of the inner ring; one end of the support plate along its length is connected to the inner ring, and the other end is connected to the outer ring; the support plate includes a hollow shell; the shell is provided with a first coating hole and a second coating hole; the multiple first coating holes and multiple second coating holes in the casing are alternately distributed around the axis of the inner ring; the opening area of ​​the first coating hole is larger than the opening area of ​​the second coating hole;

[0032] Multiple first sealing plates, each corresponding to a first coating hole; the first sealing plate is fixedly connected to the support plate to block the corresponding first coating hole;

[0033] Multiple second sealing plates are provided, each corresponding to a second coating hole; the second sealing plate is fixedly connected to the support plate to block the corresponding second coating hole.

[0034] To solve the problem of insufficient penetration of the slurry into the inner cavity of the wax mold during the coating process, this invention has the following advantages:

[0035] Based on the shape and dimensions of the semi-finished casing, a wax model assembly containing the shell plate is manufactured. After applying a slurry to form the shell assembly, the wax model assembly is removed. The shell assembly is then cast to form the semi-finished casing. After removing the shell assembly, a first sealing plate is welded to the semi-finished casing to seal the first coating hole, and a second sealing plate is welded to the semi-finished casing to seal the second coating hole. Finally, the semi-finished casing undergoes post-processing. The larger first coating hole facilitates slurry entry into the hollow shell plate, ensuring sufficient slurry penetration into the hollow cavity and guaranteeing the quality of the subsequent shell assembly. The smaller second coating hole ensures the overall strength of the support plate, preventing deformation during slurry application and thus affecting the shell assembly manufacturing. This solves the problem of insufficient slurry entry into the casing cavity during the shell coating process. Attached Figure Description

[0036] Figure 1 A schematic diagram of the casting method of the hollow thin-walled inclined support plate casing of Embodiment 1 is shown;

[0037] Figure 2 A top view of the hollow thin-walled inclined support plate casing in Embodiment 2 is shown;

[0038] Figure 3 It shows Figure 2 A schematic diagram of a hollow thin-walled inclined support plate casing;

[0039] Figure 4 A partial simplified cross-sectional view of the support plate in the wax mold assembly of Embodiment 1 is shown;

[0040] Figure 5 A partial simplified cross-sectional view of the support plate and shell assembly in the semi-finished casing after casting is shown in Embodiment 1.

[0041] Reference numerals: Inner ring 10; Outer ring 20; Support plate 30; First coating hole 40; Second coating hole 50; Shell assembly 60; Contouring shell 61; Reinforcing rib 62; Reinforced shell 63; Binding strap 70. Detailed Implementation

[0042] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0043] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0044] In the composition of aircraft power and transmission systems, the casing is a core load-bearing and protective component, responsible for housing key parts such as bearings, gears, and blades, separating different functional cavities, and ensuring the coordinated operation of various components. Currently, the industry commonly uses investment casting to manufacture aircraft casings. The investment casting process includes steps such as creating a wax model, applying the wax coating, dewaxing, pouring, and shell removal. During wax model creation, a wax model matching the shape of the cast product needs to be produced. Some types of casings have a hollow long support plate structure, forming a hollow thin-walled structure. The inner cavity of the long support plate is narrow, and one end may be closed, making it difficult for the slurry to fully enter the inner cavity of the long support plate during the coating process. Typically, an additional slurry opening is added to facilitate slurry entry into the inner cavity of the long support plate. After casting, the slurry opening is welded and sealed. The slurry opening size is small, and the wall thickness of the long support plate is thin, so the welding strength does not easily affect the overall structural strength.

[0045] However, for larger casings, in order to improve yield and minimize the outer diameter during molding, the gating system is often placed between the support plates. The gating system is usually installed in the gaps between multiple long support plates, which obstructs the grouting openings, making it difficult for the grout to enter the inner cavity of the long support plates, resulting in insufficient grouting.

[0046] Therefore, the casing with a hollow thin-walled structure is not sufficiently coated during the shell coating process, which affects the casting quality of the product.

[0047] Example 1:

[0048] In this embodiment, to solve the above problems, this application provides a casting method for a hollow thin-walled inclined support plate casing. For example... Figure 1 As shown, the casting method for the hollow thin-walled inclined support plate casing includes steps S10 to S80, which are performed sequentially: S10, S20, S30, S40, S50, S60, S70, and S80. Steps S10 to S80 will be described in detail below:

[0049] Step S10: A wax model assembly is manufactured based on the shape and dimensions of the semi-finished casing. The wax model assembly has the same shape and dimensions as the semi-finished casing, providing a precise conforming basis for the subsequent molding of the shell assembly 60, ensuring the molding accuracy of the semi-finished casing. For example, Figure 2As shown, the semi-finished casing includes an inner ring 10, an outer ring 20, and a support plate 30. The inner ring 10 and the outer ring 20 are concentrically arranged. Multiple support plates 30 are arranged around the axis of the inner ring 10. One end of the support plate 30 is connected to the inner ring 10, and the other end is connected to the outer ring 20. The support plate 30 includes a hollow shell with first coating holes 40 and second coating holes 50. The multiple first coating holes 40 and multiple second coating holes 50 in the semi-finished casing are alternately distributed around the axis of the inner ring 10. The opening area of ​​the first coating hole 40 is larger than the opening area of ​​the second coating hole 50. The larger area of ​​the first coating hole 40 facilitates the entry of slurry into the hollow shell, ensuring that the slurry can fully enter the hollow cavity of the shell, reducing the impact of the casting system on the wax mold assembly on the coating slurry, and ensuring the finished quality of the subsequent shell assembly 60. The smaller area of ​​the second coating hole 50 can ensure the overall strength of the support plate 30 and prevent the support plate 30 from deforming during the subsequent coating process, thus affecting the production of the shell assembly 60.

[0050] Step S20: Apply slurry to the wax mold assembly to form the shell assembly 60, which forms the cavity structure required for casting and provides mold guarantee for the molding of the semi-finished casing.

[0051] Step S30: Remove the wax mold assembly from the shell assembly 60.

[0052] In step S40, the shell assembly 60 after the wax mold assembly has been removed is poured, so that the molten metal fills the cavity to form the semi-finished casing.

[0053] Step S50: Clean the housing assembly 60 on the semi-finished casing.

[0054] In step S60, the first sealing plate is welded to the semi-finished casing to seal the first coating hole 40, so as to prevent gas or liquid leakage from the first coating hole 40 during the use of the casing. Figure 2 The first sealing plate is not shown.

[0055] In step S70, the second sealing plate is welded to the semi-finished casing to seal the second coating hole 50, so as to prevent gas or liquid leakage from the second coating hole 50 during the use of the casing. Figure 2 The second cover plate is not shown.

[0056] Step S80 involves post-processing the semi-finished casing to improve its mechanical properties and surface quality, thereby producing a finished casing that meets usage requirements.

[0057] Further, step S60 includes steps S61 and S62. The casting method for the hollow thin-walled inclined support plate casing is performed sequentially through steps S10, S20, S30, S40, S50, S61, S62, S70, and S80. Steps S61 and S62 will be described in detail below:

[0058] In step S61, the welding device welds the first sealing plate to the semi-finished casing from the outside of the support plate 30, thereby achieving initial fixation of the first sealing plate and the semi-finished casing and ensuring the initial stability of the casing and the first sealing plate.

[0059] In step S62, the welding device is inserted through the second coating hole 50 into the inner cavity of the support plate 30, and welded to the support plate 30 on the side of the first sealing plate facing inward to seal the first coating hole 40. The smaller size of the second coating hole 50 facilitates a more complete connection between the inner and outer sides of the first sealing plate and the support plate 30, further improving the welding seal and connection strength. This ensures that the first coating hole 40 is reliably sealed, preventing gas or liquid leakage during subsequent use due to an excessively large welding area.

[0060] Furthermore, the inner ring 10 is provided with first through holes that correspond one-to-one with the support plate 30. The outer ring 20 is provided with second through holes that correspond one-to-one with a portion of the support plate 30. The first through holes are used for the flow of gas or oil. The second through holes are used for the flow of gas or oil. In the support plate 30 with the second through holes, the first coating hole 40 is located in the middle position between the first through hole and the second through hole. On the support plate 30 with the second through hole, since the support plate 30 has the first through hole and the second through hole when coating the slurry, the coated slurry can enter the inner cavity of the support plate 30 through the first through hole and the second through hole. In order to ensure the uniformity of the coated slurry, the first coating hole 40 is located in the middle position between the first through hole and the second through hole. The slurry can also enter the inner cavity of the support plate 30 through the larger area of ​​the first coating hole 40, thereby ensuring the uniformity of the slurry distribution and meeting the molding requirements and fluid flow function.

[0061] Furthermore, due to the usage requirements of the casing, one end of some support plates 30 connected to the outer ring 20 is closed, thereby adjusting the connectivity of the support plates 30 and enhancing the adaptability of the casing structure. Specifically, in the support plates 30 with one end closed connected to the outer ring 20, the distance from the first coating hole 40 to the outer ring 20 is less than the distance from the first coating hole 40 to the inner ring 10. Setting the first coating hole 40 closer to the outer ring 20 allows the position arrangement of the first coating hole 40 to match the internal cavity connectivity characteristics of the support plate 30, reducing the impact of the difficulty in coating the slurry in the deep, closed inner cavity of the support plate 30, and ensuring the sufficiency of slurry coating in the inner cavity of the support plate 30; on the other hand, while ensuring that the coating slurry can smoothly enter the inner cavity of the support plate 30 to complete the coating and forming, it can also reduce the structural weakening of the key load-bearing area of ​​the support plate 30 near the inner ring 10 by the first coating hole 40, improve the load-bearing capacity of the support plate 30, and ensure the overall structural strength of the casing.

[0062] Further, step S20 includes step S21, in which the casting method for the hollow thin-walled inclined support plate casing is performed sequentially through steps S10, S21, S30, S40, S50, S60, S70, and S80. Step S21 will be described in detail below:

[0063] Step S21: The wax model assembly is coated with slurry in a coating motion to form the shell assembly 60. When the wax model assembly is in the coating motion posture, the axis of the inner ring 10 is horizontal, and the wax model assembly rotates around the axis of the inner ring 10. The side of the first coating hole 40 facing the outside of the support plate 30 is in the same direction as the movement of the support plate 30. By coating the wax model assembly with the inner ring 10 axis horizontal and rotating around it, the centrifugal force generated by the rotation allows the slurry to adhere evenly to the inner cavity of the support plate 30 near the outer ring 20. This further alleviates the problem of difficult slurry coating caused by the closed design of some sections of the inner cavity of the support plate 30 near the outer ring 20. This avoids localized slurry accumulation or gaps, ensuring the uniformity of the thickness of the shell assembly 60. The first coating hole 40 faces the outside of the support plate 30 and is in the same direction as the movement direction, which can further promote the slurry to enter the inner cavity of the support plate 30 through the first coating hole 40. The slurry dripping from the second coating hole 50 will also drip into the first coating hole 40 by gravity, thereby improving the integrity of the inner cavity coating, ensuring the molding quality of the shell assembly 60, and providing a guarantee for the precise molding of the subsequent casing semi-finished product.

[0064] Further, step S21 includes steps S211 and S212. The casting method for the hollow thin-walled inclined support plate casing is performed sequentially through steps S10, S211, S212, S30, S40, S50, S60, S70, and S80. Steps S211 and S212 will be described in detail below:

[0065] Step S211: The wax model assembly is coated with slurry in a coating motion to create a contour shell 61. The inner cavity shape of the contour shell 61 is the same as that of the wax model assembly, accurately replicating the external structure of the semi-finished casing and providing a basic cavity for the molding of the semi-finished casing. The shape of the support plate 30 in the wax model assembly is the same as... Figure 4 The support plate 30 shown in the figure has the same shape.

[0066] In step S212, a reinforcing rib 62 is placed at the position corresponding to the first coating hole 40 on the conformal shell 61, and slurry is continued to be applied to form the shell assembly 60. The reinforcing rib 62 is located on the side of the first coating hole 40 facing the outside of the support plate 30, and the reinforcing rib 62 can be iron wire. The shell assembly 60 includes a conformal shell 61, a reinforcing rib 62, and a reinforced shell 63 fixedly connected together, with the reinforced shell 63 attached to the surface of the reinforcing rib 62. The reinforcing rib 62 enhances the structural strength of the area of ​​the shell assembly 60 corresponding to the first coating hole 40, preventing the shell in this area from being weak due to the large size of the first coating hole 40. Thus, this application enables the greater pressure exerted on the shell assembly 60 by the molten metal near the second coating hole 50 injected into the shell assembly 60 to match the structural reinforcement of the shell in the area of ​​the first coating hole 40, ensuring the structural stability of the shell assembly 60 during casting, preventing damage to the shell assembly 60 during coating, and further improving the overall stability and load-bearing capacity of the shell assembly 60. Figure 5 A partial simplified cross-sectional view of the support plate of the shell assembly of the semi-finished casing after casting is shown in Embodiment 1.

[0067] Since the reinforcing rib 62 extends along the side of the first coating hole 40 toward the outside of the support plate 30, it is difficult to fix the reinforcing rib 62 to the shell assembly 60. Therefore, this application uses a strap 70 wrapped around the outer periphery of the shell assembly 60. Figure 5 As shown, the relative positions of the reinforcing rib 62 and the conformal shell 61 are fixed by the strap 70 before the coating of the reinforced shell 63 is applied, to prevent the reinforcing rib from loosening and thus ensure the stability of the coating of the reinforced shell 63.

[0068] Furthermore, the reinforcing rib 62 is annular, and its annular contour coincides with the contour of the first coating hole 40. This allows the reinforcing rib 62 to precisely correspond to the edge area of ​​the first coating hole 40, achieving uniform reinforcement of the shell around the first coating hole 40 and avoiding insufficient local reinforcement. Simultaneously, this design does not obstruct the first coating hole 40, minimizing interference with the entry of the coating slurry into the inner cavity of the wax mold on the support plate 30, thereby improving the forming quality of the shell assembly 60. This maximizes the structural strength of the corresponding area of ​​the shell while ensuring the coating forming function.

[0069] Furthermore, the length direction of the first coating hole 40 is parallel to the length direction of the support plate 30. This allows the coating slurry to flow and fill more smoothly along the length direction within the cavity of the support plate 30, improving the uniformity and integrity of the coating within the cavity. Simultaneously, this structural design facilitates the insertion of the welding torch into the cavity of the support plate 30 during subsequent welding and sealing operations, ensuring the sealing effect of the first coating hole 40 and the welding quality.

[0070] Furthermore, post-processing includes grinding and heat treatment. The grinding process removes burrs, excess weld slag, and mold residue from the surface of the semi-finished casing, improving surface smoothness and dimensional accuracy. The heat treatment process adjusts the internal microstructure of the casing material, enhancing its mechanical properties such as strength, toughness, and hardness. This combined grinding and heat treatment post-processing comprehensively improves the quality and performance of the finished casing, ensuring it meets the requirements of actual operating conditions.

[0071] Example 2:

[0072] In this embodiment, the present application provides a hollow thin-walled inclined support plate casing, which is manufactured using any of the casting methods in Embodiment 1. Figure 2 , Figure 3 As shown, the hollow thin-walled inclined support plate casing includes an inner ring 10, an outer ring 20, a support plate 30, multiple first sealing plates, and multiple second sealing plates.

[0073] The inner ring 10 and the outer ring 20 are concentrically arranged to ensure the coaxiality of the casing and improve the stability of the casing during operation.

[0074] Multiple support plates 30 are arranged around the axis of the inner ring 10. One end of the support plate 30 is connected to the inner ring 10 along its length, and the other end is connected to the outer ring 20, forming a stable ring-shaped support structure that effectively enhances the overall rigidity and load-bearing capacity of the casing. The support plate 30 includes a hollow shell with first coating holes 40 and second coating holes 50. The multiple first coating holes 40 and multiple second coating holes 50 in the casing are alternately distributed around the axis of the inner ring 10. The opening area of ​​the first coating holes 40 is larger than that of the second coating holes 50. The larger opening area of ​​the first coating holes 40 facilitates the entry of slurry into the hollow shell, while the smaller opening area of ​​the second coating holes 50 ensures the overall strength of the support plate 30.

[0075] The first sealing plate corresponds one-to-one with the first coating hole 40. The first sealing plate is fixedly connected to the support plate 30 to block the corresponding first coating hole 40. The one-to-one fixed connection between the first sealing plate and the first coating hole 40 ensures the sealing of the inner cavity of the support plate 30, avoids gas or oil leakage, impurities entering and other problems during use, and ensures the normal operation of the casing.

[0076] The second sealing plate corresponds one-to-one with the second coating hole 50. The second sealing plate is fixedly connected to the support plate 30 to block the corresponding second coating hole 50. The one-to-one fixed connection between the second sealing plate and the second coating hole 50 ensures the sealing of the inner cavity of the support plate 30, avoids gas or oil leakage, impurities entering and other problems during use, and ensures the normal operation of the casing.

[0077] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A casting method for a hollow thin-walled inclined support plate casing, characterized in that, The casting method includes: A wax model assembly is manufactured according to the shape and size of the semi-finished casing. The semi-finished casing includes an inner ring, an outer ring, and a support plate. The inner ring and the outer ring are concentrically arranged. Multiple support plates are arranged around the axis of the inner ring. One end of the support plate is connected to the inner ring, and the other end is connected to the outer ring. The support plate includes a hollow shell. The shell is provided with a first coating hole and a second coating hole. The multiple first coating holes and multiple second coating holes in the semi-finished casing are alternately distributed around the axis of the inner ring. The opening area of ​​the first coating hole is larger than the opening area of ​​the second coating hole. The wax mold assembly is coated with a slurry to form a molding shell assembly; Remove the wax mold assembly from the shell assembly; The shell assembly from which the wax mold assembly has been removed is cast to form the semi-finished casing. Clean the housing assembly from the semi-finished casing; The first sealing plate is welded to the semi-finished casing to seal the first coating hole; The second sealing plate is welded to the semi-finished casing to seal the second coating hole; The semi-finished casing is post-processed to produce the finished casing; The larger first coating hole facilitates the entry of slurry into the hollow shell, ensuring that the slurry can fully enter the hollow cavity of the shell and guarantee the quality of the finished shell assembly. The smaller second coating hole ensures the overall strength of the support plate and prevents the support plate from deforming during the subsequent slurry coating process, thus affecting the production of the shell assembly.

2. The casting method of a hollow thin-walled inclined support plate casing according to claim 1, characterized in that, The step of welding the first sealing plate to the semi-finished casing to seal the first coating hole includes: The welding device welds the first sealing plate to the semi-finished casing from the outside of the support plate; The welding device is inserted through the second coating hole into the inner cavity of the support plate, and the first sealing plate is welded to the support plate on the side facing the inside of the support plate to seal the first coating hole.

3. The casting method of a hollow thin-walled inclined support plate casing according to claim 1, characterized in that, The inner ring is provided with a first through hole that corresponds to and communicates with the support plate; the outer ring is provided with a second through hole that corresponds to and communicates with a portion of the support plate; the first through hole is used for the flow of gas or oil; the second through hole is used for the flow of gas or oil; in the support plate that communicates with the second through hole, the first coating hole is located at the middle position between the first through hole and the second through hole.

4. The casting method of a hollow thin-walled inclined support plate casing according to claim 3, characterized in that, In some of the support plates, one end connected to the outer ring is closed; in the support plate where one end connected to the outer ring is closed, the distance from the first coating hole to the outer ring is less than the distance from the first coating hole to the inner ring.

5. The casting method of a hollow thin-walled inclined support plate casing according to claim 1, characterized in that, The process of coating the wax mold assembly with a slurry to form a molding shell assembly includes: The wax mold assembly is coated with slurry in a coating motion posture to form a mold shell assembly; when the wax mold assembly is in the coating motion posture, the axis of the inner ring is set horizontally, the wax mold assembly rotates around the axis of the inner ring, and the side of the first coating hole facing the outside of the support plate is in the same direction as the movement direction of the support plate.

6. The casting method of a hollow thin-walled inclined support plate casing according to claim 5, characterized in that, The process of coating the wax mold assembly with slurry in a coating motion to form a molding shell assembly includes: The wax model assembly is coated with slurry in a coating motion to form a contoured shell; the inner cavity shape of the contoured shell is the same as the shape of the wax model assembly. A reinforcing rib is placed at the position corresponding to the first coating hole on the molded shell, and slurry is continued to be applied to form a molded shell assembly; the reinforcing rib is located on the side of the first coating hole facing the outside of the support plate; the molded shell assembly includes the molded shell, the reinforcing rib, and the reinforced shell that are fixedly connected; the reinforced shell is attached to the surface of the reinforcing rib.

7. The casting method of a hollow thin-walled inclined support plate casing according to claim 6, characterized in that, The reinforcing rib is ring-shaped; the ring-shaped outline of the reinforcing rib coincides with the outline of the first coating hole.

8. The casting method of a hollow thin-walled inclined support plate casing according to claim 1, characterized in that, The length direction of the first coating hole is parallel to the length direction of the support plate.

9. The casting method of a hollow thin-walled inclined support plate casing according to claim 1, characterized in that, The post-processing includes polishing and heat treatment.

10. A hollow thin-walled inclined support plate casing, characterized in that, The hollow thin-walled inclined support plate casing is manufactured using the casting method described in any one of claims 1-9; The hollow thin-walled inclined support plate casing includes: Inner ring; The outer ring, and the inner ring are concentrically arranged with the outer ring; A support plate, wherein multiple support plates are arranged around the axis of the inner ring; one end of the support plate along its length is connected to the inner ring, and the other end is connected to the outer ring; the support plate includes a hollow shell; the shell is provided with a first coating hole and a second coating hole; the multiple first coating holes and multiple second coating holes in the casing are alternately distributed around the axis of the inner ring; the opening area of ​​the first coating hole is larger than the opening area of ​​the second coating hole; Multiple first sealing plates, each corresponding to a first coating hole; the first sealing plate is fixedly connected to the support plate to block the corresponding first coating hole; Multiple second sealing plates are provided, each corresponding to a second coating hole; the second sealing plate is fixedly connected to the support plate to block the corresponding second coating hole.

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