Turbine blade margin plate forming process based on blade body front edge coating

Abstract

The invention relates to a turbine blade margin plate forming process based on blade body front edge coating. The turbine blade margin plate forming process comprises the following steps that S1, a blade body, a tenon, a margin plate upper laying sheet and a margin plate lower laying sheet which are integrated are obtained; s2, the blade body is wrapped with the upper edge plate laying sheet and the lower edge plate laying sheet in a surrounding mode; s3, the blade body wrapping cloth wraps the rear edge of the blade body from the two sides with the front edge of the blade body as the center, the lower edge is turned over, a notch formed after the lower edge is turned over is filled with a patch, and the blade body wrapping cloth and a patch margin plate upper laying piece are sewn and then placed in a blade body mold; s4, the tenon wrapping cloth wraps the tenon from the bottom to the two sides, and the lower edge is turned over; and S5, sewing the folded lower edge of the blade body wrapping cloth, the patch, the folded lower edge of the tenon wrapping cloth, the edge plate upper laying layer piece and the edge plate lower laying layer piece along the fitting area to obtain the edge plate of the blade. Compared with the prior art, the layering quality, the forming reliability, the front edge impact resistance and the structural integrity are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature structural component design and manufacturing, and in particular to a turbine blade edge plate forming process based on blade leading edge cladding. Background Art

[0002] The lip plate of a ceramic-matrix composite turbine rotor blade, located at the base of the blade, enhances structural strength and reduces blade vibration, while also helping to reduce airflow leakage and aerodynamic losses, thereby improving turbine efficiency. Ensuring an effective and reliable connection between the lip plate, the blade body, and the tenon is a key technical challenge in blade structural design, directly impacting the stability and reliability of the overall structure.

[0003] Furthermore, the leading edge of the blade, as the first point of contact with the airflow, is subject to significant aerodynamic impact. Especially in high-temperature and high-pressure environments, the high-speed impact of the airflow can cause significant thermal and mechanical stresses, potentially affecting the structural integrity and performance stability of the leading edge area. Therefore, the design of the leading edge area requires special attention to fiber continuity to enhance its impact resistance.

[0004] Ceramic-based composites have excellent high-temperature performance, low-density characteristics, and high strength and stiffness. Applying them to aircraft engine manufacturing can not only break through the temperature resistance limits of traditional high-temperature alloys, but also simplify the design of cooling structures and effectively achieve weight reduction goals.

[0005] For example, the invention with publication number CN117142869A discloses a ceramic-based composite material rotor blade fiber preform and a manufacturing method. The rotor blade fiber preform includes a blade body, an edge plate and a tenon that are connected as one and formed by overlapping multiple layers of fiber plies. The fiber plies are made of SiC fiber cloth. The tenon includes a main body, which includes two opposite tenon end faces and two tenon side faces adjacent to the two tenon end faces. The two side edges of the fiber ply correspond to the two tenon end faces respectively. The tenon side faces are the active surfaces of the tenon. The two active surfaces are suitable for contacting the two inner walls of the tenon groove respectively, and the inclination angle of each active surface is suitable for being the same as the inclination angle of the corresponding inner wall.

[0006] However, the blades in this application are constructed from fiber layers folded toward the center. The splicing structure at the leading edge of the blades clearly affects the continuity of the fiber layers, thereby affecting the integrity and stability of the blades. Furthermore, the blade edges are formed by bending to the sides, with gaps concentrated on both sides of the blades. This creates stress concentration, impacting the rotor's load-bearing capacity.

[0007] When designing the molding process for ceramic-matrix composite turbine rotor blade lip plates, attention must be paid to the continuity of the fiber layup and the reliability of the structural connections. The continuity of the fiber layup plays a key role in maintaining the overall performance of the structure, directly affecting the distribution of internal stress and the efficient transfer of loads. The reliability of the connection between the lip plate, the blade body, and the tenon structure is essential for ensuring the stable operation of the blade under complex operating conditions. During the manufacturing process, material damage should be effectively avoided while ensuring the precise manufacture of complex geometric shapes. Furthermore, subsequent processing steps should be minimized to reduce processing difficulty and improve manufacturing efficiency.

[0008] In summary, in the existing turbine rotor molding process, the fiber continuity of the leading edge of the blade is poor, and the continuity of the entire blade cannot be guaranteed. In addition, the openings of the limit plates on the blade and the edge plate are concentrated, resulting in stress concentration problems on the blade, affecting the load-bearing capacity of the blade. Summary of the Invention

[0009] The purpose of the present invention is to overcome the defects of the above-mentioned prior art that the fiber sheets of the blade are discontinuous at the leading edge, affecting the integrity and stability of the leading edge area of ​​the blade, and the edge plates are folded to both sides, with the openings concentratedly distributed, resulting in local stress concentration, and to provide a turbine blade edge plate forming process based on the blade leading edge covering.

[0010] The purpose of the present invention can be achieved by the following technical solutions: A turbine blade edge plate forming process based on blade leading edge cladding includes the following steps: S1: Obtain an integrated blade body and tenon, and obtain the upper and lower plies of the blade body according to the size and shape of the blade body root and the blade. S2: wrapping the upper layer of the edge plate and the lower layer of the edge plate around the blade body, respectively, with the openings of the upper layer of the edge plate and the lower layer of the edge plate being located on both sides of the blade body; S3: Based on the unfolded topological shape of the blade and edge plate, obtain the blade covering cloth and patch, wrap the blade covering cloth from both sides toward the blade trailing edge with the leading edge as the center, fold the lower edge of the blade covering cloth and fit it onto the upper layer of the edge plate, fill the patch into the gap formed by the folded lower edge of the blade covering cloth, sew the blade covering cloth, patch, and upper layer of the edge plate together, and then place them in the blade mold; S4: according to the size and shape of the tenon, obtain the tenon covering cloth, wrap the tenon covering cloth from the bottom of the tenon to both sides, fold the bottom edge of the tenon covering cloth and fit it to the lower layer of the edge plate; S5: Sewing the folded lower edge of the blade covering cloth, the patch, the folded lower edge of the tenon covering cloth, the upper layer of the edge plate, and the lower layer of the edge plate along the fitting area to obtain the edge plate of the blade.

[0011] Preferably, the upper layer of the edge plate and the lower layer of the edge plate are both annular opening structures. The opening of the upper ply sheet of the edge plate is located at one end of the leading edge of the blade, and the opening of the lower ply sheet of the edge plate is located at one end of the trailing edge of the blade.

[0012] Preferably, the annular opening structure is formed by cutting inside the upper and lower lip sheets, and the cutting position boundaries of the upper and lower lip sheets are aligned with the surface of the blade cross section at the root of the blade.

[0013] Preferably, the upper plies of the edge plate and the lower plies of the edge plate have the same thickness and are both prepared by laminating SiC fiber reinforced materials using a plain weave process.

[0014] Preferably, the blade cover cloth includes a blade portion, a first folding portion, a second folding portion and a third folding portion; The first folding portion, the second folding portion and the third folding portion are sequentially arranged at one end of the blade body close to the edge plate. The first folding portion, the second folding portion and the third folding portion are segmented structures, and the patch is respectively located in the gap between the second folding portion and the first folding portion and between the first folding portion and the third folding portion.

[0015] Preferably, the first folded portion is provided with a side arc section at one end away from the blade body portion, and after the first folded portion is folded along the root of the leading edge of the blade body, the side arc section is unfolded and flush with the edge of the paving sheet of the edge plate; The second folded portion is provided with a blade back arc section at one end away from the blade body portion. After the second folded portion is folded along the blade back root portion of the blade body, the blade back arc section is unfolded and flush with the edge of the paving sheet on the edge plate. An end of the third folded portion away from the blade body is provided with a blade basin arc section. After the third folded portion is folded along the blade basin root of the blade body, the blade basin arc section is unfolded and flush with the edge of the paving sheet on the edge plate.

[0016] Preferably, the patch includes a blade back patch and a blade basin patch, the blade back patch cooperates with the notch between the second folding portion and the first folding portion, and the blade basin patch cooperates with the notch between the first folding portion and the third folding portion.

[0017] Preferably, the tenon covering cloth is prepared by cutting SiC fiber cloth according to the topological shapes of the tenon and the edge plate, and the tenon covering cloth is covered on the tenon and fixed by puncturing.

[0018] Preferably, the tenon covering cloth includes a convex expansion portion, a tenon covering portion and a concave arc expansion portion connected in sequence, and the convex expansion portion is provided with an arc segment at one end away from the tenon covering portion, and after the convex expansion portion is folded, the arc segment is expanded and flush with the edge of the layer under the edge plate; the concave arc expansion portion is provided with a concave arc segment at one end away from the tenon covering portion, and after the concave arc expansion portion is folded, the concave arc segment is expanded and flush with the edge of the layer under the edge plate.

[0019] Preferably, the blade body and the tenon are an integrally formed structure, formed by laying SiC fiber cloth.

[0020] Compared with the prior art, the present invention has the following advantages: (1) This solution sets an integrated covering cloth on the outer side of the blade. Considering that the edge plate surrounds the blade, a gap will be generated when the lower edge of the blade covering cloth is expanded in a circular manner. A corresponding patch is set to fill the gap and sewed together with the blade covering cloth. The blade covering cloth is wrapped from both sides to the trailing edge from the leading edge of the blade as the center. The leading edge of the blade is the starting position for wrapping. The covering sheet is continuous here, realizing the continuous laying of fibers in the leading edge, forming a continuous and complete fiber-reinforced structure, improving the impact resistance, structural integrity and stability of the leading edge, and improving the impact resistance and environmental adaptability of the blade. Compared with the nesting method from the top to the bottom of the blade, the edge plate ply sheet adopts the method of wrapping around both sides, which can eliminate the problem that the opening of the ply sheet is affected by the torsion angle of the blade and the problem of loose fibers during nesting. In addition, SiC fiber cloth with a tight structure and large friction between fibers is selected. It is relatively stable when cutting and bending, not easy to loosen, reducing the process difficulty and improving the strength of the blade.

[0021] (2) This scheme uses the leading edge of the blade as the center line to cover the blade in the direction of the trailing edge. Compared with the method of covering from both sides, it can significantly reduce the difficulty of the molding process, reduce the number of splicing interfaces of the covering sheet, and reduce the risk of debonding or degradation of mechanical properties at the interface, thereby improving the overall structural performance.

[0022] (3) In this scheme, the edge plate ply sheets are wrapped around the root of the blade along the opening direction of the leading edge and the trailing edge of the blade. Considering the width of the blade compared to its thickness, compared with setting the openings of the edge plate ply sheets on both sides of the blade basin and the back of the blade, setting the openings at the leading edge and the trailing edge of the blade can effectively limit excessive opening during the wrapping process, thereby reducing the risk of structural damage to the edge plate ply sheets due to fiber stretching and improving the ply quality and molding reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A flow chart of the blade edge plate forming process provided by the present invention; Figure 2 A schematic diagram of the method for opening and surrounding wrapping of two edge plate plies provided by the present invention; Figure 3 Schematic diagram of the blade covering cloth shape and blade covering process provided by the present invention; Figure 4 A schematic diagram of the cooperation between two blade fiber cloth patches and the blade covering cloth provided by the present invention; Figure 5 A schematic diagram of the blade covering cloth provided by the present invention being turned outward and sewn to the edge plate ply sheets, and then fixed with a mold; Figure 6 The shape of the tenon covering cloth and the schematic diagram of the covered tenon provided by the present invention; In the figure: 1, edge plate laying layer, 2, edge plate lower layer, 3, blade covering cloth, 4, blade back patch, 5, blade basin patch, 6, tenon covering cloth, 7, blade, 8, blade root, 9, tenon, 10, blade mold; 31, blade portion, 32, first folding portion, 33, second folding portion, 34, third folding portion, 321, side arc segment, 331, blade back arc segment, 341, blade basin arc segment; 61, raised expansion portion, 62, tenon covering portion, 63, concave arc expansion portion, 611, circular arc segment, 631, concave arc segment; DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0027] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present 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. Therefore, they should not be understood as limiting the present invention.

[0028] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0029] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0030] Example 1 like Figures 1 to 6 As shown, this embodiment provides a turbine blade edge plate forming process based on blade leading edge cladding, comprising the following steps: S1: Obtain an integrated blade body 7 and tenon 9, and obtain a lip plate upper layer 1 and a lip plate lower layer 2 according to the size and shape of the blade body root 8 and the lip plate; S2: The upper edge plate layer 1 and the lower edge plate layer 2 are respectively wrapped around the blade body 7, with the openings of the upper edge plate layer 1 and the lower edge plate layer 2 being located on both sides of the blade body 7; S3: Based on the unfolded topological shape of the blade 7 and the edge plate, obtain the blade covering cloth 3 and the patch, wrap the blade covering cloth 3 from both sides toward the trailing edge of the blade 7 with the leading edge of the blade 7 as the center, fold the lower edge of the blade covering cloth 3 and fit it onto the layer 1 on the edge plate, fill the patch into the gap formed by the folded lower edge of the blade covering cloth 3, and sew the blade covering cloth 3, the patch, and the layer 1 on the edge plate together, and then place them in the blade mold 10; S4: Obtain the tenon covering cloth 6 according to the size and shape of the tenon 9, and wrap the tenon covering cloth 6 from the bottom of the tenon 9 to both sides, fold the lower edge of the tenon covering cloth 6 and fit it to the lower layer 2 of the edge plate; S5: Sew the folded lower edge of the blade covering cloth 3, the patch, the folded lower edge of the tenon covering cloth 6, the edge plate upper layer 1 and the edge plate lower layer 2 along the bonding area to obtain the blade edge plate.

[0031] An integrated wrapping fabric is provided on the outer side of the blade 7. Considering that the edge plate wraps around the blade, a circular expansion of the blade wrapping fabric 3 creates a gap. This gap is filled with a corresponding patch and sewn together with the blade wrapping fabric 3. The blade wrapping fabric 3 wraps from the leading edge of the blade toward the trailing edge, starting at the leading edge. The wrapping fabric is continuous at this point, achieving continuous fiber placement at the leading edge and forming a continuous, complete fiber-reinforced structure. This improves the impact resistance, structural integrity, and stability of the leading edge, enhancing the blade's impact resistance and environmental adaptability. Compared to nesting the edge plate plies from the top to the bottom of the blade, the wrapping fabric's double-sided wrapping eliminates the effects of the blade torsion angle on the ply openings and the problem of loose fibers during nesting. Furthermore, the SiC fiber cloth, with its compact structure and high interfiber friction, is used. This flat weave is relatively stable during cutting and bending, preventing loosening, reducing processing complexity, and improving blade strength.

[0032] Preferred embodiment, as Figure 2 As shown, the upper layer 1 of the edge plate and the lower layer 2 of the edge plate are both annular opening structures. The opening of the upper layer 1 of the edge plate is located at one end of the leading edge of the blade 7 , and the opening of the lower layer 2 of the edge plate is located at one end of the trailing edge of the blade 7 .

[0033] Furthermore, an annular opening structure is formed by cutting inside the edge plate upper layer 1 and the edge plate lower layer 2, and the cutting position boundaries of the edge plate upper layer 1 and the edge plate lower layer 2 are aligned with the surface of the blade cross section at the root of the blade.

[0034] In this embodiment, the edge plate upper layer 1 and the edge plate lower layer 2 have the same thickness and are both laid by plain-weave SiC fiber cloth.

[0035] The edge panel ply wraps around the root 8 of the blade along the opening direction of the leading edge and the trailing edge of the blade. Considering the width of the blade compared to the thickness, compared with setting the opening of the edge panel ply on both sides of the blade basin and the back of the blade, setting the opening at the leading edge and the trailing edge of the blade can effectively limit excessive opening during the wrapping process, thereby reducing the risk of structural damage to the edge panel ply due to fiber stretching, and improving the ply quality and molding reliability.

[0036] In this embodiment, Figures 3 to 5 As shown, the blade cover cloth 3 includes a blade portion 31, a first folded portion 32, a second folded portion 33 and a third folded portion 34; The first folded portion 32, the second folded portion 33 and the third folded portion 34 are sequentially arranged at one end of the blade body 31 close to the edge plate. The first folded portion 32, the second folded portion 33 and the third folded portion 34 are segmented structures, and the patches are respectively located in the gap between the second folded portion 33 and the first folded portion 32 and between the first folded portion 32 and the third folded portion 34.

[0037] Furthermore, a side arc section 321 is provided at one end of the first folded portion 32 away from the blade portion 31. After the first folded portion 32 is folded along the root of the leading edge of the blade, the side arc section 321 is unfolded and flush with the edge of the paving layer 1 on the edge plate. The second folded portion 33 is provided with a blade back arc section 331 at one end away from the blade body portion 31. After the second folded portion 33 is folded along the blade back root portion, the blade back arc section 331 is unfolded and aligned with the edge of the paving layer 1 on the edge plate. An end of the third folded portion 34 away from the blade body portion 31 is provided with a blade basin arc section 341 . After the third folded portion 34 is folded along the blade basin root of the blade body, the blade basin arc section 341 is unfolded and flush with the edge of the paving layer 1 on the edge plate.

[0038] Furthermore, the patch includes a blade back patch 4 and a blade basin patch 5. The blade back patch 4 cooperates with the gap between the second folded portion 33 and the first folded portion 32, and the blade basin patch 5 cooperates with the gap between the first folded portion 32 and the third folded portion 34.

[0039] Wrapping from the leading edge of the blade as the center line toward the trailing edge can significantly reduce the difficulty of the molding process, reduce the number of splicing interfaces of the wrapping sheet, and reduce the risk of debonding or degradation of mechanical properties at the interfaces, thereby improving the overall structural performance.

[0040] In this embodiment, Figure 6 As shown, the tenon covering cloth 6 is prepared by cutting SiC fiber cloth according to the topological shape of the tenon 9 and the edge plate. The tenon covering cloth 6 is covered on the tenon 9 and fixed by puncturing.

[0041] Among them, the tenon covering cloth 6 includes a raised expansion part 61, a tenon covering part 62 and a concave arc expansion part 63 connected in sequence. The raised expansion part 61 is provided with an arc segment 611 at one end away from the tenon covering part 62. After the raised expansion part 61 is folded, the arc segment 611 is expanded and flush with the edge of the layer 2 under the edge plate; the concave arc expansion part 63 is provided with a concave arc segment 631 at one end away from the tenon covering part 62. After the concave arc expansion part 63 is folded, the concave arc segment 631 is expanded and flush with the edge of the layer 2 under the edge plate.

[0042] In this embodiment, the blade body 7 and the tenon 9 are an integrally formed structure, which is formed by laying SiC fiber cloth.

[0043] Specifically, in combination with the above preferred embodiments, this embodiment also provides a more specific turbine blade edge plate forming process based on blade leading edge cladding, such as Figures 1 to 6 As shown, the following steps are included: The blade body and tenon of the integrated prefabricated structure are formed by laying SiC fiber cloth; The edge panel plies are divided into edge panel upper ply 1 and edge panel lower ply 2. The two plies have the same thickness and are both made of SiC fiber reinforced material stacked with a plain weave process. They are trimmed internally, and the boundary of the trimmed area just fits the boundary of the blade cross section at the blade root 8, ensuring a close connection between the edge panel structure and the blade body.

[0044] The upper layer 1 of the edge plate and the lower layer 2 of the edge plate are respectively provided with openings at the corresponding positions of the leading edge and the trailing edge of the blade, so that the upper layer 1 of the edge plate and the lower layer 2 of the edge plate can surround both sides of the blade 6 and form a close fit with the main body of the blade. Figure 2 shown.

[0045] After being cut, the two edge plate plies with different opening positions are matched with the blade body by wrapping around both sides to form a structure that fits tightly with the blade body. Figure 2 As shown in the figure, the edge panel plies wrap around the openings at the leading and trailing edges of the blade, effectively reducing the risk of fiber tensile damage caused by excessive openings during the wrapping process. Furthermore, the use of edge panel plies with openings for wrapping around both sides significantly reduces the difficulty of wrapping.

[0046] The blade body 7 is covered with fiber cloth as the blade body covering cloth 3, which is cut from SiC fiber cloth according to the topological shape of the blade body and the edge plate.

[0047] The blade is wrapped with SiC fiber cloth, wrapping from the leading edge of the blade toward the trailing edge, where it meets and is secured with puncture points. The blade cloth 3 is turned outward along the blade root edge and bonded to the ply 1 on the edge plate. SiC fiber cloth patches fill the gaps left by the wrapped and folded blade cloth 3. The patches are divided into two parts: a back patch 4 and a base patch 5. These patches are placed in the corresponding gaps between the blade back and base, bonded to the ply 1 on the edge plate, and glued into place.

[0048] The folded portion of the blade covering cloth 3 and the SiC fiber patch are sewn and fixed to the edge plate with sutures and then placed into the blade mold 10 .

[0049] The tenon covering cloth 6 is cut from SiC fiber cloth according to the topological shape of the tenon and edge plate. After the blade is installed, the blade mold is flipped over. The tenon covering cloth 6 is applied along the bottom surface of the tenon 9 and to both sides of the tenon 9. The reserved lower edges of the tenon covering cloth 6 are folded outward near the lower edge plate ply 2, making contact with the edge plate ply 2. Based on the preset structure of the lower edge, the three sides of the lower edge are aligned with the edges of the lower edge plate ply 2. The tenon covering cloth 6 and the tenon 9 can be fixed by puncturing.

[0050] The lower edge folded area of ​​the blade covering cloth 3, the patch, the edge plate upper layer 1, the edge plate lower layer 2 and the lower edge folded area of ​​the tenon covering cloth 5 are sewn together and fixed to form an edge plate structure.

[0051] By wrapping the blade along both the leading and trailing edges, the blade plate is tightly fitted to the blade. Compared to a top-to-bottom nesting method, this method avoids the influence of the blade torsion angle on the opening position, solves the technical problem of loose fiber arrangement during the nesting process, and improves process operability. Wrapping the blade along the leading edge ensures fiber continuity at the leading edge. This continuous and complete fiber fabric effectively disperses impact stress on the leading edge, avoiding localized stress concentration.

[0052] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A turbine blade edge plate forming process based on blade leading edge cladding, characterized in that: The following steps are involved: S1: Obtain an integrated blade body (7) and tenon (9), and obtain an upper lip sheet (1) and a lower lip sheet (2) according to the size and shape of the blade body root (8) and the lip sheet; S2: wrapping the upper edge plate layer (1) and the lower edge plate layer (2) around the blade body (7), respectively, with the openings of the upper edge plate layer (1) and the lower edge plate layer (2) being located on both sides of the blade body (7); S3: according to the topological shape of the blade (7) and the edge plate, obtain the blade covering cloth (3) and the patch, wrap the blade covering cloth (3) from both sides to the trailing edge of the blade (7) with the leading edge of the blade (7) as the center, fold the lower edge of the blade covering cloth (3) and fit it with the layer (1) on the edge plate, fill the patch in the gap formed by the folding lower edge of the blade covering cloth (3), and then sew the blade covering cloth (3), the patch and the layer (1) on the edge plate together, and then place them in the blade mold (10); S4: according to the size and shape of the tenon (9), obtain the tenon covering cloth (6), cover the tenon covering cloth (6) from the bottom of the tenon (9) to both sides, fold the lower edge of the tenon covering cloth (6) and fit it to the lower layer (2) of the edge plate; S5: The folded lower edge of the blade covering cloth (3), the patch, the folded lower edge of the tenon covering cloth (6), the edge plate upper layer (1) and the edge plate lower layer (2) are sewn together along the fitting area to obtain the blade edge plate.

2. The turbine blade edge plate forming process based on blade leading edge cladding according to claim 1, characterized in that: The edge plate upper layer (1) and the edge plate lower layer (2) are both annular opening structures, the opening of the edge plate upper layer (1) is located at one end of the leading edge of the blade (7), and the opening of the edge plate lower layer (2) is located at one end of the trailing edge of the blade (7).

3. The turbine blade edge plate forming process based on blade leading edge cladding according to claim 2, characterized in that: An annular opening structure is formed by cutting inside the upper edge plate ply sheet (1) and the lower edge plate ply sheet (2), wherein the cutting position boundaries of the upper edge plate ply sheet (1) and the lower edge plate ply sheet (2) are aligned with the surface of the blade cross section at the blade root.

4. The turbine blade edge plate forming process based on blade leading edge cladding according to claim 1, characterized in that: The edge plate upper layer (1) and the edge plate lower layer (2) have the same thickness and are both prepared by laminating SiC fiber reinforced materials using a plain weave process.

5. The turbine blade edge plate forming process based on blade leading edge cladding according to claim 1, characterized in that: The blade cover cloth (3) comprises a blade portion (31), a first folded portion (32), a second folded portion (33) and a third folded portion (34); The first folding portion (32), the second folding portion (33) and the third folding portion (34) are sequentially arranged at one end of the blade body (31) close to the edge plate. The first folding portion (32), the second folding portion (33) and the third folding portion (34) are segmented structures. The patch is respectively located in the gap between the second folding portion (33) and the first folding portion (32) and between the first folding portion (32) and the third folding portion (34).

6. The turbine blade edge plate forming process based on blade leading edge cladding according to claim 5, characterized in that: An end of the first folded portion (32) away from the blade portion (31) is provided with a side arc section (321); after the first folded portion (32) is folded along the root of the leading edge of the blade, the side arc section (321) is unfolded and flush with the edge of the ply sheet (1) on the edge plate; An end of the second folded portion (33) away from the blade body portion (31) is provided with a blade back arc section (331); after the second folded portion (33) is folded along the blade back root of the blade body, the blade back arc section (331) is unfolded and flush with the edge of the paving layer (1) on the edge plate; An end of the third folded portion (34) away from the blade body portion (31) is provided with a blade basin arc section (341); after the third folded portion (34) is folded along the blade basin root of the blade body, the blade basin arc section (341) is unfolded and flush with the edge of the paving layer (1) on the edge plate.

7. The turbine blade edge plate forming process based on blade leading edge cladding according to claim 6, characterized in that: The patch comprises a leaf back patch (4) and a leaf basin patch (5), wherein the leaf back patch (4) cooperates with the notch between the second folding portion (33) and the first folding portion (32), and the leaf basin patch (5) cooperates with the notch between the first folding portion (32) and the third folding portion (34).

8. The turbine blade edge plate forming process based on blade leading edge cladding according to claim 1, characterized in that: The tenon covering cloth (6) is prepared by cutting SiC fiber cloth according to the topological shapes of the tenon (9) and the edge plate. The tenon covering cloth (6) is covered on the tenon (9) and fixed by puncturing.

9. The turbine blade edge plate forming process based on blade leading edge cladding according to claim 1, characterized in that: The tenon covering cloth (6) comprises a raised expansion portion (61), a tenon covering portion (62) and a concave arc expansion portion (63) connected in sequence, wherein the raised expansion portion (61) is provided with an arc segment (611) at one end away from the tenon covering portion (62), and after the raised expansion portion (61) is folded, the arc segment (611) is expanded and aligned with the edge of the layer (2) under the edge plate; and the concave arc expansion portion (63) is provided with a concave arc segment (631) at one end away from the tenon covering portion (62), and after the concave arc expansion portion (63) is folded, the concave arc segment (631) is expanded and aligned with the edge of the layer (2) under the edge plate.

10. The turbine blade edge plate forming process based on blade leading edge cladding according to claim 1, characterized in that: The blade body (7) and the tenon (9) are an integrally formed structure, formed by laying SiC fiber cloth.

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