Blade prefabricated body integral forming mold and forming method
Through the integral molding mold and molding method of the blade prefabricated body, the problem of insufficient fiber continuity in the prior art is solved, the strength and stiffness of the blade are improved, the process flow is simplified, and the blade blades are met in high temperature and high pressure environments. Stability requirements.
Patent Information
- Application Number
- CN202411602372.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-01-17
AI Technical Summary
The overall structure of the existing blades has poor fiber continuity during the preparation process, resulting in a long preparation cycle, cumbersome process, and relatively poor strength and stiffness, which cannot meet the requirements of the new generation of aircraft engine blades in high temperature and high pressure environments.
The overall molding of the upper edge plate, the blade body and the lower edge plate are realized by splitting the design of the prefabricated body, the fiber cloth layer and the mold, thereby increasing the proportion of fiber continuity and simplifying the process. process.
It effectively improves the fiber continuity of the overall structure of the blade, shortens the preparation cycle, simplifies the process flow, and improves strength and stiffness, meeting the stability requirements in high-temperature and high-pressure environments.
Smart Images
Figure CN119319619A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of blade preform molding, and in particular relates to a blade preform integral molding die and a molding method. Background Art
[0002] The overall structure of the blade is an important part of the aircraft engine. It consists of three parts, namely the upper edge plate, the blade body, and the lower edge plate. The upper edge plate is a flange shape with equal thickness and cavity, the blade body cross section is crescent-shaped, the cross section thickness is thickened, and the lower edge plate is a reinforcement rib. It has high strength, rigidity and structural stability under the high temperature and dynamic and static load environment of the aircraft engine.
[0003] The overall structure of the new generation of aircraft engine blades needs to withstand increasingly severe working stresses and environmental loads such as high temperature and high pressure. The high strength and stiffness of the overall structure of the blade is an important means to ensure that its structure is more stable in harsh environments such as high temperature. The strength and stiffness of the overall structure of the blade mainly depend on the proportion of fiber continuity in its preparation process. The overall structure of the blade (such as Figure 1 The structure shown in the figure is generally prepared by online riveting and welding. The upper edge plate, blade body and lower edge plate are riveted online by carbon-ceramic composite pins and welded by chemical vapor infiltration. The fiber continuity of the overall riveted structure of the blade is relatively poor, and special riveting tooling is required for precision control during the preparation process, and its preparation is relatively cumbersome. Summary of the invention
[0004] In order to overcome the shortcomings of the prior art of online riveting and welding in blade preform molding, which has a long preparation cycle, complicated process, and relatively poor strength and rigidity, the present invention proposes a blade preform integral molding mold and molding method.
[0005] The technical solution adopted by the present invention to solve the technical problem is:
[0006] A method for integrally forming a blade preform comprises the following steps:
[0007] Step 1, designing a blade preform structure; the blade preform includes a blade body, an upper edge plate, and a lower edge plate.
[0008] Step 2, splitting the preform; according to the wall thickness of the blade preform and the fiber cloth laying method, split the preform into a first preform, a second preform, a third preform, a fourth preform, a fifth preform, a sixth preform, a seventh preform, an eighth preform, a ninth preform and a tenth preform.
[0009] Step 3, preparing a fiber cloth layer flat plate; processing the flat plate according to the designed blade preform structure size to obtain a second preform, a third preform, a fifth preform, an eighth preform, and a ninth preform.
[0010] Step 4: Wrap the fiber cloth on the inner mold surface, and the length of the fiber cloth is flush with the upper and lower end surfaces of the inner mold to obtain a first preform without flanges; and embed the second preform between the first preform without flanges and the inner mold.
[0011] Step 5, installing the inner mold wrapping the first preform without flange on the positioning tool; inserting the reserved boss end surface of the inner mold into the positioning tool slot, and placing the second preform on the boss surface of the positioning tool.
[0012] Step 6, install the first outer mold and the second outer mold; place the first outer mold and the second outer mold in the groove on the surface of the positioning tool, and fix them with positioning pins. The first outer mold and the second outer mold fit the first preform without flange.
[0013] Step 7, flanging the fiber cloth in the upper edge plate area of the first preform without flanging, cutting a certain thickness of fiber cloth through the inner mold, and laying and fixing along the upper edge plate surface. Filling the gap between the upper edge plate area of the first preform and the inner mold with the third preform.
[0014] Step 8, cutting a fourth preform fiber cloth of a certain thickness, passing it through the inner mold, and laying it along the upper edge of the board surface to fix it.
[0015] Step 9, install the third outer mold; the third outer mold fits the prefabricated body. Use bolts and positioning pins to connect and fix the third outer mold with the first outer mold and the second outer mold, and connect and fix the third outer mold with the inner mold.
[0016] Step 10, remove the excess inner mold end extending out of the third outer mold end surface and remove the positioning tooling.
[0017] Step 11, flanging the fiber cloth in the lower edge plate area of the first preform without flanging, cutting the fiber cloth to a certain thickness, passing it through the inner mold, and laying it along the lower edge plate surface to fix it. Filling the gap between the lower edge plate area of the first preform and the inner mold with the fifth preform.
[0018] Step 12, cutting the sixth preform and the seventh preform fiber cloth of a certain thickness, respectively wrapping the fourth outer mold and the fifth outer mold using the mold surface. Using bolts and positioning pins, the fourth outer mold and the fifth outer mold are respectively fixed to the first outer mold and the second outer mold, and the fourth outer mold and the fifth outer mold are fitted with the preform.
[0019] Step 13, filling the eighth preform and the ninth preform respectively in the triangular gaps where the lower edge plate of the first preform is joined with the sixth preform and the seventh preform.
[0020] Step 14, cutting a certain thickness of the tenth preform fiber cloth, the fiber cloth wraps the sixth outer mold use profile, the sixth outer mold passes through the inner mold, so that the fiber cloth wrapped by the sixth outer mold use profile is completely in contact with the fiber cloth in the lower edge plate area of the first preform. Use positioning pins to fix the inner mold to the fourth outer mold and the sixth outer mold.
[0021] Step 15, remove the excess inner mold end extending out of the sixth outer mold end face, install a graphite molding, and fix the molding to the inner mold and the outer mold through bolts and screws.
[0022] In the above-mentioned method for integrally forming a blade preform, in step 1, a machining allowance of 0.5 mm to 1.0 mm is reserved for the overall outer shape of the blade preform, and a machining allowance of 5.0 mm to 10 mm is reserved for the end surface.
[0023] In the above-mentioned method for integrally forming blade preforms, the wall thickness of the blade area of the first preform is 2.5mm, and the wall thickness of the upper edge plate and the lower edge plate area is 3.0mm; the wall thicknesses of the fourth preform, the sixth preform, the seventh preform, and the tenth preform are 1.0mm, 3.5mm, 3.5mm, and 3.0mm respectively; the inner mold, the first preform, the fourth preform, the sixth preform, the seventh preform, and the tenth preform are triangular areas formed during the layering process. The triangular areas are filled with the second preform, the third preform, the eighth preform, the ninth preform, and the fifth preform respectively;
[0024] In the above-mentioned method for integrally forming a blade preform, in step 3, the density of the fiber cloth layer plate is greater than 1.4 g / cm 3 .
[0025] In the above-mentioned method for integrally forming a blade preform, the fitting gap between the first outer mold, the second outer mold, the third outer mold, the fourth outer mold, the fifth outer mold and the sixth outer mold and the preform is less than 0.1 mm.
[0026] In the above-mentioned method for integrally forming a blade preform, in step 7, the thickness of the fiber cloth cut in the upper edge plate area of the first preform without flanges is 0.5 mm.
[0027] In the step 8, the thickness of the fiber cloth of the fourth preform is cut to be 1.0 mm.
[0028] In the step 11, the thickness of the fiber cloth cut in the lower edge plate area of the first preform without flange is 0.5 mm.
[0029] In the step 12, the thickness of the fiber cloth cut from the sixth preform and the seventh preform is 3.5 mm.
[0030] In the step 13, the thickness of the fiber cloth cut from the tenth preform is 3.0 mm.
[0031] A blade preform integral forming die comprises an inner die, an outer die, a positioning pin, a positioning tool and a pressure strip.
[0032] The outer mold includes a first outer mold, a second outer mold, a third outer mold, a fourth outer mold, a fifth outer mold, and a sixth outer mold.
[0033] The inner mold is located inside the blade preform, and the outer mold is located outside the blade preform.
[0034] A boss end face is reserved at one end of the inner mold, and the reserved boss end is installed in the slot of the positioning tool. The first outer mold and the second outer mold are placed in the groove on the surface of the positioning tool and are positioned and fixed by positioning pins.
[0035] One end of the reserved boss end face of the inner mold is connected and fixed to the third outer mold, and the other end of the inner mold passes through the sixth outer mold and is positioned and fixed to the fourth outer mold and the sixth outer mold through positioning pins.
[0036] The first outer mold and the second outer mold, the third outer mold and the first outer mold and the second outer mold, the fourth outer mold and the first outer mold, and the fifth outer mold and the second outer mold are positioned by positioning pins and connected by screws and bolts.
[0037] There are two pressure strips, one connected to the third outer mold, and the other connected to the fourth outer mold, the fifth outer mold, and the sixth outer mold. The pressure strips press the outer mold through screws and bolts to fix the outer mold.
[0038] The above-mentioned blade preform integral forming mold, the inner mold, outer mold, pressure strip, positioning pin, screw rod and bolt are all made of graphite material.
[0039] The beneficial effects of the present invention are:
[0040] A method for integrally forming a blade preform, which integrally forms blade structures such as an upper edge plate, a blade body, and a lower edge plate, further increases the fiber continuity ratio of the overall blade structure, and effectively solves the problems of long overall blade preparation cycle, complicated process, and relatively poor strength and stiffness. BRIEF DESCRIPTION OF THE DRAWINGS
[0041] Figure 1 This is a schematic diagram of the structure of a blade preform according to an embodiment of the present invention;
[0042] Figure 2 Schematic diagram of the wall thickness of the blade preform according to an embodiment of the present invention;
[0043] Figure 3 It is a schematic diagram of the prefabricated body split structure;
[0044] Figure 4 It is a schematic diagram of the structure of the prefabricated body positioning tooling;
[0045] Figure 5 is a schematic diagram of the connection between the inner mold and the second preform;
[0046] Figure 6 Schematic diagram of the first preform without flanged edges, with the fiber cloth wrapped around the inner mold and the second preform;
[0047] Figure 7It is a schematic diagram of positioning and installing the inner mold and the second preform;
[0048] Figure 8 It is a schematic diagram of positioning and installing the inner mold, the second preform, the first outer mold, and the second outer mold;
[0049] Fig. 9 Schematic diagram of the fiber cloth flanging in the upper edge plate area of the first preform and the filling of the third preform;
[0050] Fig.10 is a schematic diagram of shaping and laying out of the fourth preform;
[0051] Fig.11 Schematic diagram of the third outer mold being connected and fixed to the first outer mold, the second outer mold, and the third outer mold being connected and fixed to the inner mold;
[0052] Fig.12 Schematic diagram of removing the redundant inner mold end from the third outer mold end face;
[0053] Fig.13 It is a schematic diagram of removing the positioning tooling;
[0054] Fig.14 Schematic diagram of the fiber cloth flanging in the lower edge plate area of the first preform and the filling of the fifth preform;
[0055] Fig.15 is a schematic diagram of shaping and laying out of the sixth preform and the seventh preform;
[0056] Fig.16 Schematic diagram of the fourth outer mold and the fifth outer mold being installed and filled with the eighth preform and the ninth preform;
[0057] Fig.17 is a schematic diagram of the shaping and laying of the tenth preform;
[0058] Fig.18 It is a schematic diagram of the connection and fixation between the inner mold and the fourth outer mold and the sixth outer mold;
[0059] Fig.19 It is a schematic diagram of the mold structure of an embodiment of the present invention.
[0060] Figure numerals: 1. first preform, 2. second preform, 3. third preform, 4. fourth preform, 5. fifth preform, 6. sixth preform, 7. seventh preform, 8. eighth preform, 9. ninth preform, 10. tenth preform, 11. blade, 12. upper edge plate, 13. lower edge plate, 21. first outer mold, 22. second outer mold, 23. third outer mold, 24. fourth outer mold, 25. fifth outer mold, 26. sixth outer mold, 27. positioning tooling slot, 28. positioning tooling boss, 29. inner mold, 30. pressure strip, 31. positioning pin, 32. positioning tooling. DETAILED DESCRIPTION
[0061] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0062] Embodiment 1
[0063] A blade preform integral molding die design and process is provided to integrally mold the blade structures such as the upper edge plate, blade body, and lower edge plate, further increasing the fiber continuity ratio of the overall blade structure. It includes the following steps:
[0064] Step 1: Design the prefabricated structure. Leave a 0.5-1.0mm margin for the overall shape of the part, and a 5.0-10mm margin for the surrounding end faces. Figure 1 and Figure 2 As shown;
[0065] Step 2: Split the preform. Split the preform into the first preform 1 to the tenth preform 10 according to the wall thickness of the preform and the fiber cloth laying method. Figure 3 As shown. The wall thickness of the blade area of the first preform 1 is 2.5mm, and the wall thickness of the upper edge plate and the lower edge plate area is 3.0mm; the wall thicknesses of the fourth preform 4, the sixth preform 6, the seventh preform 7, and the tenth preform 10 are 1.0mm, 3.5mm, 3.5mm, and 3.0mm respectively; the triangular area is formed by the laying process of the inner mold, the first preform 1, the fourth preform 4, the sixth preform 6, the seventh preform 7, and the tenth preform 10. The triangular area is filled with the second preform 2, the third preform 3, the eighth preform 8, the ninth preform 9, and the fifth preform 5 respectively;
[0066] Step 3: Use the same process to prepare a density greater than 1.4g / cm 3 The flat plate is used to process the second preform 2, the third preform 3, the fifth preform 5, the eighth preform 8 and the ninth preform 9 according to the digital model size;
[0067] Step 4: Wrap the 2.5 mm thick fiber cloth shown on the unflangeable first preform 1 on the inner mold use surface (the length of the fiber cloth is flush with the upper and lower end surfaces of the inner mold), and embed the second preform 2 between the unflangeable first preform 1 and the inner mold, as shown in FIG. Figure 5 and Figure 6 As shown;
[0068] Step 5: Install the inner mold wrapped with fiber cloth on the positioning tool. The end face of the reserved boss of the inner mold is inserted into the positioning tool slot 27, and the second preform 2 is placed on the surface of the positioning tool boss 28. Figure 4 and Figure 7 As shown;
[0069] Step 6: Install the first outer mold 21 and the second outer mold 22. The mold fitting gap is required to be less than 0.1 mm. Place the first outer mold 21 and the second outer mold 22 in the grooves on the surface of the positioning tooling and fix them with positioning pins to determine the relative positions of the inner mold 29, the second preform 2, and the first outer mold 21 and the second outer mold 22. Figure 8 As shown;
[0070] Step 7: Flanging the fiber cloth in the upper edge plate area of the first preform 1 without flange, and then cutting the fiber cloth with a thickness of 0.5 mm to pass through the inner mold and lay it along the upper edge plate surface to fix it. Fill the gap between the first preform 1 and the inner mold 29 with the third preform 3, as shown in FIG. Fig. 9 As shown;
[0071] Step 8: Cut a 1.0 mm thick fourth preform 4 fiber cloth, pass it through the inner mold, and lay it along the upper edge of the board surface to fix it, such as Fig.10 As shown;
[0072] Step 9: Install the third outer mold 23. The mold fitting clearance is required to be less than 0.1 nm. Use stud bolts and positioning pins to connect and fix the third outer mold 23 to the first outer mold 21, the second outer mold 22, and the third outer mold 23 to the inner mold 29. Fig.11 As shown;
[0073] Step 10: Remove the extra end of the inner mold 29 extending out of the end surface of the third outer mold 23, such as Fig.12 As shown;
[0074] Step 11: Remove the positioning tool 32, perform flanging on the fiber cloth in the lower edge plate area of the first preform 1 that has not been flanging, and then cut a 0.5 mm thick fiber cloth and pass it through the inner mold 29, and lay it along the lower edge plate surface and fix it. Fill the gap between the first preform 1 and the inner mold 29 with the fifth preform 5, as shown in FIG. Fig.13 and Fig.14 As shown;
[0075] Step 12: Cut 3.5 mm thick fiber cloths of the sixth preform 6 and the seventh preform 7 and wrap them on the mold surfaces of the fourth outer mold 24 and the fifth outer mold 25, respectively, and fix the fourth outer mold 24 and the fifth outer mold 25 to the first outer mold 21 and the second outer mold 22 using stud bolts and positioning pins, respectively. The mold fitting clearance is required to be less than 0.1 nm. Fig.15 and Fig.16 As shown;
[0076] Step 13: The lower edge plate of the first preform 1 is fitted with the sixth preform 6 and the seventh preform 7, and the eighth preform 8 and the ninth preform 9 are respectively filled in the triangular gaps. Fig.16 As shown;
[0077] Step 14: Cut a 3.0 mm thick fiber cloth of the tenth preform 10 and wrap it on the surface of the sixth outer mold 26, and pass the sixth outer mold 26 through the inner mold 29 so that the fiber cloth wrapped by the surface is completely in contact with the fiber cloth in the lower edge plate area of the first preform 1. At the same time, use the positioning pins 31 to fix the inner mold 29 to the fourth outer mold 24 and the sixth outer mold 26, as shown in FIG. Fig.17 and Fig.18 As shown;
[0078] Step 15: Remove the extra end of the inner mold 29 extending out of the end surface of the sixth outer mold 26, and install the graphite pressure strip 30 to fix the mold as a whole. Fig.19 shown.
Claims
1. A method for integrally forming a blade preform, characterized in that: The following steps are involved: Step 1, designing a blade preform structure; the blade preform includes a blade body (11), an upper edge plate (12), and a lower edge plate (13); Step 2, splitting the preform; according to the wall thickness of the blade preform and the fiber cloth laying method, splitting the preform into a first preform (1), a second preform (2), a third preform (3), a fourth preform (4), a fifth preform (5), a sixth preform (6), a seventh preform (7), an eighth preform (8), a ninth preform (9) and a tenth preform (10); Step 3, preparing a fiber cloth layer flat plate; processing the flat plate according to the designed blade preform structure size to obtain a second preform (2), a third preform (3), a fifth preform (5), an eighth preform (8), and a ninth preform (9); Step 4, the fiber cloth is wrapped around the inner mold (29) using the molding surface, and the length of the fiber cloth is flush with the upper and lower end surfaces of the inner mold (29), so as to obtain a first preform without flanges; the second preform (2) is embedded between the first preform without flanges and the inner mold (29); Step 5, installing the inner mold (29) wrapping the first preform without flange on the positioning tool (32); inserting the end surface of the reserved boss of the inner mold (29) into the positioning tool slot (27), and placing the second preform (2) on the positioning tool boss (28); Step 6, installing the first outer mold (21) and the second outer mold (22); placing the first outer mold (21) and the second outer mold (22) in the grooves on the surface of the positioning tool (32) respectively, and fixing them with the positioning pins (31); fitting the first outer mold (21) and the second outer mold (22) with the first preform without flanges; connecting and fixing the first outer mold (21) and the second outer mold (22) with bolts and positioning pins (31); Step 7, flanging the fiber cloth in the upper edge plate (12) area of the first preform that has not been flanging, cutting a fiber cloth of a certain thickness (the middle area of the fiber cloth is cut in advance according to the size of the end surface of the inner mold (29)), passing through the inner mold (29), and laying and fixing along the surface of the upper edge plate (12); filling the gap between the upper edge plate (12) area of the first preform and the inner mold (29) with the third preform (3); Step 8, cutting a fiber cloth of a fourth preform (4) of a certain thickness, passing it through the inner mold (29), and laying it along the surface of the upper edge plate (12) and fixing it; Step 9, installing the third outer mold (23); fitting the third outer mold (23) with the fourth preform (4); using bolts and positioning pins (31), connecting and fixing the third outer mold (23) with the first outer mold (21) and the second outer mold (22), and connecting and fixing the third outer mold (23) with the inner mold (29); Step 10, removing the excess end of the inner mold (29) extending out of the end surface of the third outer mold (23), and removing the positioning tool (32); Step 11, flanging the fiber cloth in the lower edge plate (13) area of the first preform that has not been flanging, cutting the fiber cloth to a certain thickness, passing it through the inner mold (29), and laying it along the surface of the lower edge plate (13) and fixing it; filling the gap between the lower edge plate (13) area of the first preform (1) and the inner mold (29) with the fifth preform (5); Step 12, cutting the sixth preform (6) and the seventh preform (7) fiber cloth of a certain thickness, and wrapping the fourth outer mold (24) and the fifth outer mold (25) with the surface respectively; using bolts and positioning pins (31), fixing the fourth outer mold (24) and the fifth outer mold (25) to the first outer mold (21) and the second outer mold (22) respectively; Step 13, filling the eighth preform (8) and the ninth preform (9) respectively at the triangular gaps where the lower edge plate (13) of the first preform (1) fits the sixth preform (6) and the seventh preform (7); Step 14, cutting a fiber cloth of a certain thickness for the tenth preform (10), wrapping the fiber cloth around the mold surface of the sixth outer mold (26), and passing the sixth outer mold (26) through the inner mold (29), so that the fiber cloth wrapped around the mold surface of the sixth outer mold (26) is completely in contact with the fiber cloth in the area of the lower edge plate (13) of the first preform (1); fixing the inner mold (29) with the fourth outer mold (24) and the sixth outer mold (26) using positioning pins (31); Step 15, removing the excess end of the inner mold (29) extending out of the end surface of the sixth outer mold (26), installing a graphite pressure strip (30), and fixing the pressure strip (30) to the inner mold (29) and the outer mold by bolts and screws.
2. The method for integrally forming a blade preform according to claim 1, characterized in that: In the step 1, a machining allowance of 0.5 mm to 1.0 mm is reserved for the overall outer shape of the blade preform, and a machining allowance of 5.0 mm to 10 mm is reserved for the end surface.
3. The method for integrally forming a blade preform according to claim 1, characterized in that: The wall thickness of the blade body (11) of the first preform (1) is 2.5 mm, and the wall thickness of the upper edge plate (12) and the lower edge plate (13) are both 3.0 mm; The wall thicknesses of the fourth preform (4), the sixth preform (6), the seventh preform (7) and the tenth preform (10) are 1.0 mm, 3.5 mm, 3.5 mm and 3.0 mm respectively.
4. The method for integrally forming a blade preform according to claim 1, characterized in that: In step 3, the density of the fiber cloth layer plate is greater than 1.4 g / cm 3 .
5. The method for integrally forming a blade preform according to claim 1, characterized in that: The gap between the first outer mold (21), the second outer mold (22), the third outer mold (23), the fourth outer mold (24), the fifth outer mold (25) and the sixth outer mold (26) and the preform is less than 0.1 mm.
6. The method for integrally forming a blade preform according to claim 1, characterized in that: In the step 7, the thickness of the fiber cloth cut in the upper edge plate area of the first preform without flange is 0.5 mm; In the step 8, the thickness of the fiber cloth of the fourth preform (4) is cut to be 1.0 mm; In the step 11, the thickness of the fiber cloth cut in the lower edge plate area of the first preform without flange is 0.5 mm; In the step 12, the thickness of the fiber cloth cut from the sixth preform (6) and the seventh preform (7) is 3.5 mm; In the step 13, the thickness of the fiber cloth cut from the tenth preform (10) is 3.0 mm.
7. A mold for implementing the molding method according to any one of claims 1 to 6, characterized in that: It comprises an inner mold (29), an outer mold, a positioning pin (31), a positioning tool (32), and a pressure strip (30); The outer mold comprises a first outer mold (21), a second outer mold (22), a third outer mold (23), a fourth outer mold (24), a fifth outer mold (25), and a sixth outer mold (26); The inner mold is located inside the blade preform, and the outer mold is located outside the blade preform; A boss end face is reserved at one end of the inner mold, and the reserved boss end is installed in a positioning tool slot (27). The first outer mold (21) and the second outer mold (22) are placed in a groove on the surface of the positioning tool (32) and are positioned and fixed by a positioning pin (31); One end of the inner mold is connected and fixed to the third outer mold (23), and the other end of the inner mold passes through the sixth outer mold (26) and is positioned and fixed to the fourth outer mold (24) and the sixth outer mold (26) through a positioning pin (31); The first outer mold (21) and the second outer mold (22), the third outer mold (23) and the first outer mold (21) and the second outer mold (22), the fourth outer mold (24) and the first outer mold (21), and the fifth outer mold (25) and the second outer mold (22) are positioned by positioning pins (31) and connected by screws and bolts; There are two pressure strips, one of which is connected to the third outer mold (23), and the other is connected to the fourth outer mold (24), the fifth outer mold (25), and the sixth outer mold (26); the pressure strip (30) is pressed against the outer mold by screws and bolts to fix the outer mold.
8. The blade preform integral forming mold according to claim 7, characterized in that: The inner mold (29), the outer mold, the pressure strip (30), the positioning pin (31), the screw rod and the bolt are all made of graphite material.