Leaf disc body protection device

Abstract

The invention belongs to the technical field of aero-engine fans / air compressors, and discloses a blade disc body protection device which comprises an end cover, a base, a long bolt and a nut. The end cover comprises a cover plate, an end cover inner hole concentric with the blade disc is formed in the center of the cover plate, an end cover cylinder is arranged on the periphery of the cover plate, and a first axial matching end face of the end cover cylinder makes contact with the front disc edge of the blade disc. The base comprises a bottom plate, a base inner hole concentric with the blade disc is formed in the center of the bottom plate, and a second axial matching end face making contact with the rear disc edge of the blade disc is arranged on the periphery of the bottom plate. The long bolt sequentially penetrates through an inner hole of the base, the center of the blade disc and an inner hole of the end cover and then is in threaded connection with the nut. The disc body protection device is simple in structure and convenient to operate, can effectively protect the blisk body, and can prevent active atoms of aluminum / nitrogen from flowing to the disc body when being used for aluminizing / nitriding of blisk blades.

Description

Technical Field

[0001] The invention belongs to the field of aircraft engine fans / compressors, relates to the field of blade disk body protection device design, and specifically relates to a blade disk body protection device. Background Art

[0002] Aluminizing and nitriding are chemical heat treatment methods that allow active atoms of aluminum or nitrogen to penetrate into the surface of parts at a certain temperature. The corrosion resistance of aircraft engine parts can be improved through aluminizing / nitriding heat treatment operations.

[0003] Low-temperature aluminizing is widely used on a variety of engine steel blades. It has the advantages of simple process and good economy. However, there are certain difficulties in heat treatment of aluminizing / nitriding of steel integral blades. Since the aluminized layer is a brittle layer, the blade disc body will be subjected to greater stress during operation. Under the action of large stress, the aluminized layer is prone to form microcracks and thus strain fatigue failure. Therefore, the integral blade disc is only allowed to be aluminized on the blades and flow path surfaces, and the rest of the disc body surface does not need to be aluminized. This requires the integral blade disc body to be protected to prevent the aluminized layer from entering the disc body and reducing the service life of the blade disc.

[0004] In view of this, there is an urgent need to design a device for protecting the blade disc body during chemical heat treatment of the blades. Summary of the invention

[0005] In order to solve the technical problem of how to protect the blade disk body when performing heat treatment on blades, the present invention discloses a blade disk body protection device, which includes an end cover, a base, long bolts and nuts.

[0006] The end cover comprises a cover plate, the center of the cover plate is provided with an end cover inner hole concentric with the blade disk, the outer periphery of the cover plate is provided with an end cover cylinder, and the first axial matching end surface of the end cover cylinder contacts the front disk edge of the blade disk.

[0007] The base comprises a bottom plate, a base inner hole which is concentric with the blade disk is provided at the center of the bottom plate, and a second axial matching end surface which contacts with the rear disk edge of the blade disk is provided at the outer periphery of the bottom plate.

[0008] The long bolt passes through the inner hole of the base, the core of the blade disk and the inner hole of the end cover in sequence and is threadedly connected with the nut.

[0009] Furthermore, an end cover journal for inserting into the disc body journal of the blade disc is provided on the inner hole of the end cover.

[0010] Furthermore, a first nickel-platinum sheet is provided between the first axial mating end surface and the front disk edge, and a second nickel-platinum sheet is provided between the second axial mating end surface and the rear disk edge.

[0011] Furthermore, a base journal for inserting into the blade disk core of the blade disk is provided on the inner hole of the base.

[0012] Furthermore, an annular support platform is provided on the outer periphery of the base journal, and the annular support platform is in contact with the end surface of the blade disk core.

[0013] Furthermore, an annular boss is provided on the inner surface of the bottom plate and located inside the second axial mating end face, and the annular boss is clearance-matched with the root of the rear disc edge.

[0014] Furthermore, the free end of the annular boss is inclined toward the second axial mating end surface.

[0015] Furthermore, an outer peripheral edge of the base is processed with an inclined surface, and the inclined direction of the inclined surface is away from the blades on the blade disk.

[0016] Furthermore, the long bolts are welded on the base.

[0017] Furthermore, the disk protection device also includes a lifting ear, and the lifting ear is welded on the end cover.

[0018] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above technical solutions adopted in the embodiments of this specification include at least the following: the disc protection device of the present invention has a simple structure and is easy to operate, and can effectively protect the disc body of the blade disk. When used for chemical heat treatment such as aluminizing or nitriding, it can effectively block the active atoms of aluminum and nitrogen from flowing to the disc body, prevent the active atoms of aluminum or nitrogen from penetrating into the surface of the disc body, and reduce the risk of the disc body becoming brittle and cracking due to the penetration of aluminum or nitrogen. At the same time, in addition to being used for disc body protection in chemical heat treatment, the disc body protection device can also be used in other disc processing scenarios where the disc body needs to be protected, such as blade surface coating, blade vibration finishing, and protection of the disc body during blade shot peening.

[0019] At the same time, the provision of the nickel-platinum sheet can provide a more reliable seal and further improve the protection of the disk body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a blade disk body protection device disclosed in an embodiment of the present invention;

[0022] Figure 2Another structural schematic diagram of the blade disk body protection device disclosed in an embodiment of the present invention;

[0023] Among them, 2. blade disk; 4. long bolt; 5. nut; 6. lifting ear; 7. first nickel-platinum sheet; 8. second nickel-platinum sheet; 11. first axial matching end face; 12. end cover journal; 13. end cover inner hole; 14. cover plate; 15. end cover cylinder; 21. front disk edge; 22. rear disk edge; 23. blade disk center; 24. disk body journal; 31. second axial matching end face; 32. annular boss; 33. base journal; 331. annular support platform; 34. base inner hole; 35. bottom plate; 37. inclined surface. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0025] The following describes the implementation methods of the present application through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and the features of the embodiments can be combined with each other in the absence of conflict. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0026] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the invention.

[0027] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0028] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The illustrations only show components related to the present disclosure rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0029] The embodiment of the present invention discloses a blade disk body protection device, see Figure 1 and Figure 2 As shown, the disk protection device includes an end cover, a base, a long bolt 4 and a nut 5.

[0030] See also Figure 1 and Figure 2 As shown, the end cover includes a cover plate 14 , a cover inner hole 13 concentric with the blade disk 2 is provided at the center of the cover plate 14 , an end cover cylinder 15 is provided on the outer periphery of the cover plate 14 , and a first axial mating end face 11 of the end cover cylinder 15 contacts the front disk edge 21 of the blade disk 2 .

[0031] See also Figure 1 and Figure 2 As shown, the base includes a bottom plate 35, the center of the bottom plate 35 is provided with a base inner hole 34 concentric with the blade disk 2, and the outer periphery of the bottom plate 35 is provided with a second axial matching end face 31 in contact with the rear disk edge 22 of the blade disk 2. Among them, the bottom plate 35 can use a large area for supporting the end face to ensure the stability of the entire device. At the same time, the base and the end cover need to be set to a sufficient thickness to ensure that the device has strong rigidity, so that it is not easy to deform during use and can be reused many times.

[0032] The long bolt 4 passes through the inner hole 34 of the base, the center of the blade disk 2 and the inner hole 13 of the end cover in sequence and is threadedly connected with the nut 5 .

[0033] Before the blade heat treatment for aluminizing / nitriding operation, firstly, the long bolt 4 is passed through the base inner hole 34 of the base to connect the two; then the blade disk 2 is installed, so that the disk core of the blade disk 2 passes through the long bolt 4, so that the rear disk edge 22 of the blade disk 2 contacts the second axial matching end face 31 on the base, so that the base supports the blade disk 2; again, the end cover is installed, so that the end cover inner hole 13 of the end cover passes through the long bolt 4, so that the first axial matching end face 11 of the end cover cylinder 15 contacts the front disk edge 21 of the blade disk 2; finally, the nut 5 is installed on the long bolt 4 to complete the installation of the disk body protection device and the blade disk 2. During the aluminizing / nitriding operation, since the rear disk edge 22 of the blade disk 2 contacts the second axial matching end face 31 on the base, and the first axial matching end face 11 contacts the front disk edge 21 of the blade disk 2, it can be avoided that the aluminizing / nitriding powder enters the disk body and the disk core to aluminize / nitridize on the disk body and the disk core.

[0034] Further, see Figure 1 and Figure 2 As shown, an end cover journal 12 is provided on the end cover inner hole 13 for inserting into the disk body journal 24 of the blade disk 2. Through the setting of the end cover journal 12, on the one hand, the end cover journal 12 and the disk body journal 24 cooperate with each other to play a centering role, which can improve the connection stability between the end cover and the blade disk 2. On the other hand, the action between the end cover journal 12 and the disk body journal 24 can divide the pressure on the front disk edge 21 when the first axial mating end face 11 contacts with the front disk edge 21 of the blade disk 2, thereby avoiding damage to the blade disk 2.

[0035] Further, see Figure 1 and Figure 2 As shown, a first nickel platinum sheet 7 is provided between the first axial mating end face 11 and the front disk edge 21, and a second nickel platinum sheet 8 is provided between the second axial mating end face 31 and the rear disk edge 22. By arranging the first nickel platinum sheet 7 and the second nickel platinum sheet 8 on the contact end faces, it is possible to further prevent aluminizing / nitriding powder from entering the disk body and the disk core and aluminizing / nitriding on the disk body and the disk core.

[0036] Further, see Figure 1 and Figure 2 As shown, a base journal 33 is provided on the inner hole 34 of the base for inserting into the blade disk core 23 of the blade disk 2. Through the setting of the base journal 33, on the one hand, the base journal 33 and the blade disk core 23 cooperate with each other to play a centering role, which can improve the connection stability between the base and the blade disk 2; on the other hand, the pressure on the rear disk edge 22 when the rear disk edge 22 contacts the second axial mating end face 31 can be divided through the action between the base journal 33 and the blade disk core 23, thereby avoiding damage to the blade disk 2.

[0037] Further, see Figure 2 As shown, an annular support platform 331 is provided on the outer periphery of the base journal 33, and the annular support platform 331 is in contact with the end face of the blade disk core 23. By setting the annular support platform 331 on the base journal 33, the blade disk core 23 can be supported, and the pressure on the rear disk edge 22 when the rear disk edge 22 contacts the second axial matching end face 31 and the pressure on the front disk edge 21 when the first axial matching end face 11 contacts the front disk edge 21 of the blade disk 2 can be divided to avoid damage to the blade disk 2.

[0038] Further, see Figure 1 and Figure 2As shown, an annular boss 32 is provided on the inner surface of the bottom plate 35 and located inside the second axial mating end face 31. The annular boss 32 is clearance-matched with the root of the rear disc edge 22. The annular boss 32 protrudes toward the disc body relative to the second axial mating end face 31 to prevent the aluminum powder leaking into the disc cavity from further flowing to the web and the disc center. The annular boss 32 can further provide protection on the basis of the contact seal of the second axial mating end face 31 contacted by the rear disc edge 22, to prevent aluminizing / nitriding powder from entering the disc body and the disc center and aluminizing / nitriding on the disc body and the disc center.

[0039] Further, see Figure 2 As shown, the free end of the annular boss 32 is inclined toward the second axial mating end face 31. By tilting the annular boss 32, a ring-shaped receiving groove can be formed between the free end and the root of the annular boss 32 to receive the aluminizing / nitriding powder entering the disk body and the disk center.

[0040] Further, see Figure 1 and Figure 2 As shown, the outer peripheral edge of the base is processed with an inclined surface 37, and the inclined direction of the inclined surface 37 is away from the blades on the blade disk 2. In specific implementation, the inclination angle of the inclined surface 37 can be set to 30°~45° to prevent obstruction of aluminum infiltration of the blades.

[0041] Furthermore, in order to reduce the need to repeat the process of inserting the bolts each time the device is used and improve the operating efficiency, the long bolts 4 are welded to the base to form a whole.

[0042] Further, see Figure 1 and Figure 2 As shown, the disk protection device also includes a lifting lug 6, which is welded on the end cover. In specific implementation, the lifting lug 6 can be set to one or more, and can be welded on the cover plate 14 or on the end cover cylinder 15. It should be noted that the position of the lifting lug 6 needs to avoid the position of the end cover inner hole 13 to avoid blocking the operation when the nut 5 is installed on the long bolt 4. Among them, the lifting lug 6 can be designed as a U-shaped structure and made of a stainless steel pipe.

[0043] When designing the disk protection device, first: the material of the end cover can be selected from 1Cr11Ni2W2MoV or other stainless steel materials according to the actual temperature resistance requirements. The wall thickness of the end cover cylinder 15 of the end cover can be set to 8mm~10mm, and the thickness of the cover plate 14 can be set to 10mm~20mm. The wall thickness should not be too thin to increase the rigidity of the end cover and avoid thermal deformation caused by aluminization. The thickness of the first axial matching end face 11 at the end of the end cover cylinder 15 is adapted to the thickness of the disk edge to avoid the annular surface diameter at the first axial matching end face 11 being too much larger than the disk edge, which affects the aluminization of the blade root chamfer. Generally, the outer circumferential surface radius at the first axial matching end face 11 is about 1mm~2mm larger than the disk edge radius. At the same time, in order to ensure the end face is pressed tightly to reduce the leakage of aluminum powder, the first axial matching end face 11 is set to a flatness of less than 0.02. If the disk body of the blade disk 2 has comb teeth, it needs to be avoided to avoid damaging the parts. The length of the end cover journal 12 in the end cover inner hole 13 needs to match the disc body journal 24, for example, the matching length of the two can be set to 8mm to 12mm, and there is a small clearance between the end cover journal 12 and the disc body journal 24, and the matching clearance can be set to 0.1mm to 0.2mm. The diameter of the end cover inner hole 13 is slightly larger than the external thread diameter of the long bolt 4, for example, the difference between the two can be set to 0.8mm to 1mm. Preferably, the connection position between the various components in the end cover can be set to a 5mm to 8mm chamfer.

[0044] Secondly, the material of the base can be selected according to the actual temperature resistance requirements, for example, 1Cr11Ni2W2MoV or other stainless steel materials can be selected. The thickness of the second axial mating end face 31 on the base is adapted to the thickness of the other end of the disk rim of the blade 2, so as to avoid the diameter of the second axial mating end face 31 protruding too much from the disk rim, so as not to affect the aluminum infiltration at the rounded part of the blade root. Generally, the outer diameter of the second axial mating end face 31 is about 1mm to 2mm larger than the radius of the disk rim. In order to ensure the end face is pressed and reduce the leakage of aluminum powder, the second axial mating end face 31 is set with a flatness less than 0.02. Furthermore, the connection between the wheel rim plate and the web plate is generally a contraction structure. In order to further prevent the leaked aluminum powder from flowing to the disk body, an annular boss 32 can be set inside the end face of the base. The extension length of the annular boss 32 to the disk body is determined according to the actual disk body parts. In order to avoid damaging the parts, an axial gap of 2mm to 3mm is retained between the annular boss 32 and the disk body. The outer cylindrical surface of the base journal 33 and the inner cylindrical surface of the disk center are matched with a small gap to ensure good centering, and the matching gap is 0.1mm~0.2mm. The inner hole 34 of the base is matched with the bare rod part of the long bolt 4, and the matching gap is 0.08mm~0.2mm. In order to ensure the firmness and rigidity of the base to effectively support the whole set of equipment, the outer cylindrical surface radius of the bottom plate 35 should be as large as possible, and the outer cylindrical surface radius of the bottom plate 35 is 10mm~15mm larger than the radius of the disk edge. The difference between the outer cylindrical surface and the inner cylindrical surface radius of the bottom plate 35 is recommended to be 15mm~20mm. The inclination direction of the inclined surface 37 is away from the blade direction to prevent the aluminum infiltration of the blade from being blocked. The angle between the inclined surface 37 and the vertical plane is recommended to be 30°~45°.

[0045] Again, the first nickel platinum sheet and the second nickel platinum sheet 8 are designed. The nickel platinum sheet is a high temperature resistant (temperature resistance requirements should meet the aluminizing / nitriding temperature of the parts) annular structure, the thickness can be 0.2mm-0.3mm, and the inner and outer diameters of the annular ring are consistent with the corresponding disk edge diameter. The material of the long bolt 4 can be the same as that of the base. The long bolt 4 includes a cylindrical head and a polished rod, and the free end of the polished rod is provided with an external thread.

[0046] The disc body protection device of the present invention has a simple structure and is easy to operate. It can effectively protect the disc body of the blade disc. When used for chemical heat treatment such as aluminizing or nitriding, it can effectively block the active atoms of aluminum and nitrogen from flowing to the disc body, prevent the active atoms of aluminum or nitrogen from penetrating into the disc body surface, and reduce the risk of the disc body becoming brittle and cracking due to the penetration of aluminum or nitrogen. At the same time, in addition to being used for disc body protection in chemical heat treatment, the disc body protection device can also be used in other disc processing scenarios where the disc body needs to be protected, such as blade surface coating, blade vibration finishing, and blade shot peening.

[0047] At the same time, the provision of the nickel-platinum sheet can provide a more reliable seal and further improve the protection of the disk body.

[0048] Obviously, those skilled in the art should understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A blade disk protection device, characterized in that: The disk protection device comprises: An end cover, the end cover comprising a cover plate (14), an end cover inner hole (13) concentric with the blade disk (2) being provided at the center of the cover plate (14), an end cover cylinder (15) being provided at the outer periphery of the cover plate (14), and a first axial mating end surface (11) of the end cover cylinder (15) being in contact with a front disk edge (21) of the blade disk (2); A base, the base comprising a bottom plate (35), a base inner hole (34) concentric with the blade disk (2) being provided at the center of the bottom plate (35), and a second axial mating end surface (31) in contact with the rear disk edge (22) of the blade disk (2) being provided at the outer periphery of the bottom plate (35); A long bolt (4) and a nut (5), wherein the long bolt (4) passes through the inner hole (34) of the base, the center of the blade disk (2) and the inner hole (13) of the end cover in sequence and is then threadedly connected to the nut (5).

2. The blade disk protection device according to claim 1, characterized in that: The inner hole (13) of the end cover is provided with an end cover journal (12) for inserting into the disc body journal (24) of the blade disc (2).

3. The blade disk protection device according to claim 1, characterized in that: A first nickel-platinum sheet (7) is provided between the first axial mating end surface (11) and the front disk edge (21), and a second nickel-platinum sheet (8) is provided between the second axial mating end surface (31) and the rear disk edge (22).

4. The blade disk protection device according to claim 1, characterized in that: The inner hole (34) of the base is provided with a base journal (33) for inserting into the blade disk core (23) of the blade disk (2).

5. The blade disk protection device according to claim 4, characterized in that: An annular support platform (331) is provided on the outer periphery of the base journal (33), and the annular support platform (331) is in contact with the end surface of the blade disk core (23).

6. The blade disk protection device according to claim 1, characterized in that: An annular boss (32) is provided on the inner surface of the bottom plate (35) and located inside the second axial matching end surface (31), and the annular boss (32) is clearance-matched with the root of the rear disc edge (22).

7. The blade disk protection device according to claim 6, characterized in that: The free end of the annular boss (32) is inclined toward the second axial matching end surface (31).

8. The blade disk protection device according to claim 1, characterized in that: An inclined surface (37) is processed on the outer peripheral edge of the base, and the inclined direction of the inclined surface (37) is away from the blades on the blade disk (2).

9. The blade disk protection device according to claim 1, characterized in that: The long bolts (4) are welded on the base.

10. The blade disk protection device according to any one of claims 1 to 9, characterized in that: The disk protection device also includes a lifting lug (6), and the lifting lug (6) is welded to the end cover.

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