A large size composite propeller blade forming mold and a method of using the same

Abstract

This invention relates to the field of composite material propeller blade molding technology, and discloses a large-size composite material propeller blade molding mold, comprising: a blade, a base mold, and a connecting section assembly mold. The base mold is located below the blade, and one side of the base mold has a product film-coating surface. The connecting section assembly mold is located above the base mold, and includes a top mold, a side wall mold below the top mold, and a fastening mold on the side of the side wall mold away from the top mold. This invention, through the combination of a base mold, a connecting section assembly mold, and a prepreg vacuum bag compression molding process, produces large-size composite material propeller blades with low cost, high quality, and high performance. The product has a compact structure, low porosity, high fiber straightness, and excellent performance. It also has the advantages of a clear and simple production process, low equipment requirements, convenient and quick mold operation, and strong feasibility.

Description

Technical Field

[0001] This invention belongs to the field of composite material propeller blade forming technology, specifically relating to a large-size composite material propeller blade forming mold and its usage method. Background Technology

[0002] A propeller blade is a device that converts engine power into propulsion. It generally consists of two or more blades connected to a hub. The rearward side of the blade is a helical surface or a near-helical surface. It is mainly used as a power component in ships, submarines and other fields.

[0003] With the advancement and development of science and technology, composite materials have been gradually applied in various fields due to their ability to maintain the advantages of each component material and their good comprehensive performance. Among them, composite propeller blades have become the main research direction for propeller weight reduction and noise reduction design due to their high strength, high damping and low density characteristics.

[0004] Currently, most composite material propeller blades are manufactured using prepreg vacuum bag molding, especially for large-sized composite material propeller blades. Vacuum bag molding refers to placing the part in a vacuum bag and using a vacuum method to solidify the part under vacuum pressure. During vacuum molding, appropriate molds are required to position and shape the part.

[0005] Existing technologies for molding large-size composite propeller blades are prone to problems such as high manufacturing costs, low feasibility, and low product qualification rates due to the influence of molding dies during the molding process. Therefore, they are not suitable for molding large-size composite propeller blades.

[0006] Therefore, in order to address the above-mentioned technical problems, it is necessary to provide a large-size composite material propeller blade forming mold and its usage method. Summary of the Invention

[0007] The purpose of this invention is to provide a large-size composite material propeller blade forming mold and its usage method, so as to solve the problems of high manufacturing cost, low feasibility and low product qualification rate caused by the influence of the forming mold during the forming process of the large-size composite material propeller blade.

[0008] To achieve the above objectives, an embodiment of the present invention provides the following technical solution:

[0009] A large-size composite material propeller blade forming mold includes: blade, base mold, and connecting section assembly mold.

[0010] The blade consists of two parts: the blade surface and the blade root.

[0011] The base mold is located below the blade. One side of the base mold has a product film-coating surface that matches the blade surface. A forming groove is formed on the side of the base mold away from the product film-coating surface. A release mold is provided in the forming groove. A mold positioning groove is formed on the side wall of the forming groove. A mold fastening surface is formed on the side wall of the forming groove away from the mold positioning groove.

[0012] The connecting section assembly mold is located above the base mold. The connecting section assembly mold includes a top mold, a side wall mold is provided below the top mold, and a fastening mold is provided on the side of the side wall mold away from the top mold.

[0013] Furthermore, the base mold is connected to multiple lifting rings. This facilitates subsequent operation of the mold by lifting the lifting rings. The mold positioning groove has bolt holes on the side away from the mold fastening surface; these bolt holes are circular through holes used to connect the fixing bolts and assembly bolts on the connecting section assembly mold.

[0014] Furthermore, a pair of movable stops are engaged on the side of the base mold away from the product film-coating surface. These movable stops smooth the mold's shape, allowing for significant shape changes during vacuum bag compression molding. Simultaneously, the movable stops facilitate the removal of the demolding module. A pair of ejector blocks are connected within the molding groove. These ejector blocks assist in demolding the product within the molding groove. A pair of ejector holes are provided within the molding groove, located below the ejector blocks, and both holes penetrate the base mold. This facilitates ejection of the ejector blocks through the ejector holes.

[0015] Furthermore, the top mold has a top molding surface on the side closest to the sidewall mold. The top molding surface ensures the top shape of the blade surface and blade root. An overflow groove is provided on the outer side of the top molding surface. The overflow groove is used to drain excess resin material during the molding process, thereby controlling the resin content of the product.

[0016] Furthermore, the outer side of the top mold is provided with multiple locating pin holes and connecting bolt holes. The locating pin holes, in conjunction with the locating pins on the side wall mold, determine the installation position of the top mold, thereby improving the convenience and accuracy of assembling the top mold. The multiple locating pin holes and connecting bolt holes are spaced apart, and the connecting bolt holes are used to tighten the fixing bolts, allowing the top mold to be tightly and effectively connected to the side wall mold. The top mold is also provided with auxiliary threaded holes. The top mold is moved by the interaction of the auxiliary threaded holes and auxiliary threaded rods.

[0017] Furthermore, the inner side of the sidewall mold is a sidewall forming surface. The sidewall forming surface is used to define the sidewall shape of the blade surface and blade root. Multiple sets of locating pins are fixedly connected to the upper part of the sidewall mold, and these locating pins correspond to locating pin holes. The top mold is assembled and fixed by engaging the locating pins with the locating pin holes on the top mold. A locating section is provided at the lower part of the sidewall mold, and this locating section engages with a mold locating groove. Forming pressure is applied to the sidewall mold through the interaction between the locating section and the mold locating groove.

[0018] Furthermore, the side of the sidewall mold away from the sidewall forming surface is a pressure surface, on which multiple fixing bolts are connected. These fixing bolts are spaced apart from the positioning section, and each fixing bolt has a threaded nut at its top. The fixing bolts and nuts combine to form a fastener assembly. This facilitates the fastening of the top mold and the sidewall mold using the fixing bolts and nuts. The sidewall mold has auxiliary threaded holes, which, in conjunction with an auxiliary threaded rod, allow for the transfer of the sidewall mold.

[0019] Furthermore, the inner side of the fastening mold is a pressure-fitting surface, which mates with the pressure surface. This pressure-fitting surface mates with the pressure surface of the sidewall mold, applying lateral pressure to the sidewall mold. The outer side of the fastening mold is a fastening surface, which is an inclined surface that mates with the mold's fastening surface. By setting the fastening surface as an inclined surface, the top mold mates with the mold's fastening surface, thereby converting the bolt fastening force into a lateral force. Multiple assembly bolts are connected to the top of the fastening mold.

[0020] Furthermore, each end of one of the assembly bolts is threaded with an assembly nut, and the assembly bolts and assembly nuts combine to form a fastener assembly. The fastening mold and the base mold are assembled and fixed by the mutual engagement of the assembly bolts and assembly nuts. The fastening mold has multiple second auxiliary threaded holes, and one side of the base mold has an auxiliary threaded rod that matches the second auxiliary threaded holes. The fastening mold is moved by the mutual engagement of the second auxiliary threaded holes and the auxiliary threaded rod.

[0021] A method for using a large-size composite material propeller blade forming mold includes the following steps:

[0022] S1. Lay the composite material propeller blade material on the product film surface of the base mold, and adjust the composite material propeller blade material according to the shape and position of the product film surface so that the composite material propeller blade material fits the product film surface.

[0023] S2. Assemble the connecting section combination mold, insert the positioning section of the side wall mold into the mold positioning groove of the base mold, and then assemble the fastening mold. Place the fastening mold between the side wall mold and the base mold so that the pressure contact surface matches the pressure surface of the side wall mold and the fastening surface matches the mold fastening surface of the base mold. Fasten the mold by inserting and assembling bolts.

[0024] S3. Finally, assemble the top mold, align the positioning pin holes of the top mold with the positioning pins on the side wall mold, and combine the top mold and the side wall mold by inserting them together. After the combination is completed, tighten the fixing bolts and fixing nuts on the side wall mold to complete the mold assembly. If the positioning pin holes cannot be combined, the assembly bolts and assembly nuts of the mold need to be tightened further.

[0025] S4. After the mold is assembled, according to the vacuum bag compression molding process, lay the isolation film and breathable felt on the outside of the mold in sequence, seal the vacuum bag, and put it into the oven to cure and form after vacuuming.

[0026] S5. After molding is completed, remove the vacuum bag and related auxiliary materials, and proceed to the mold removal process;

[0027] S6. During the mold removal process, the top mold, fastening mold and side wall mold are removed in sequence. Then, the demolding module and movable stop block on the base mold are removed. The slurry product is separated from the base mold by exposing part of the product. If the product is still difficult to demold, the product is demolded by ejecting the ejector block through the ejector hole.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] This invention utilizes a combination of a basic mold, a connecting section combination mold, and a prepreg vacuum bag molding process to produce large-size composite material propeller blades. It features low cost, high quality, and high performance, resulting in products with a compact structure, low porosity, high fiber straightness, and excellent performance.

[0030] At the same time, it has the advantages of a clear and simple production process, low equipment requirements, convenient and quick mold operation, and strong feasibility. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1This is a schematic diagram of the structure of a large-size composite material propeller blade forming mold in one embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of a composite material propeller blade in one embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of a basic mold in one embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the basic mold from another angle in one embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the connecting section assembly mold in one embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the top mold in one embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the top mold from another angle in one embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of the sidewall mold in one embodiment of the present invention;

[0040] Figure 9 This is a schematic diagram of the fastening mold in one embodiment of the present invention;

[0041] Figure 10 This is a schematic diagram of the auxiliary threaded rod in one embodiment of the present invention;

[0042] Figure 11 This is a schematic diagram of the first usage state of the auxiliary threaded rod in one embodiment of the present invention;

[0043] Figure 12 This is a schematic diagram of the second usage state of the auxiliary threaded rod in one embodiment of the present invention;

[0044] Figure 13 This is a schematic diagram of the third usage state of the auxiliary threaded rod in one embodiment of the present invention;

[0045] Figure 14 This is a schematic diagram of the first usage state of a large-size composite material propeller blade forming mold according to an embodiment of the present invention;

[0046] Figure 15 This is a schematic diagram of the second usage state of a large-size composite material propeller blade forming mold according to an embodiment of the present invention;

[0047] Figure 16This is a schematic diagram of the third usage state of a large-size composite material propeller blade forming mold according to an embodiment of the present invention;

[0048] Figure 17 This is a schematic diagram of the fourth usage state of a large-size composite material propeller blade forming mold according to an embodiment of the present invention;

[0049] Figure 18 This is a schematic diagram of the fifth usage state of a large-size composite material propeller blade forming mold according to an embodiment of the present invention;

[0050] Figure 19 This is a schematic diagram of the basic mold removal and disassembly operation in one embodiment of the present invention.

[0051] In the diagram: 1. Blade, 11. Blade surface, 12. Blade root, 2. Basic mold, 21. Product film application surface, 22. Hanging ring, 23. Demounting module, 24. Mold positioning groove, 25. Mold fastening surface, 26. Bolt hole, 27. Movable stop, 28. Ejector block, 29. Ejector hole, 3. Connecting section combination mold, 31. Top mold, 311. Top forming surface, 312. Glue overflow groove, 313. Positioning pin hole, 314. Connecting bolt hole. 315. Auxiliary threaded hole; 32. Side wall mold; 321. Side wall forming surface; 322. Locating pin; 323. Locating section; 324. Pressure surface; 325. Fixing bolt; 326. Fixing nut; 327. Auxiliary threaded hole; 33. Fastening mold; 331. Pressure contact surface; 332. Fastening surface; 333. Assembly bolt; 334. Assembly nut; 335. Second auxiliary threaded hole; 4. Auxiliary threaded rod; 41. Handle; 42. Threaded post. Detailed Implementation

[0052] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0053] This invention discloses a large-size composite material propeller blade forming mold, with reference to Figures 1-19 As shown, it includes: blade 1, basic mold 2, and connecting section assembly mold 3.

[0054] refer to Figure 2 As shown, the blade 1 consists of two parts: the blade surface 11 and the blade root 12.

[0055] refer to Figures 3-4 As shown, the base mold 2 is located below the blade 1, and a product coating surface 21 is provided on one side of the base mold 2. The product coating surface 21 matches the blade surface 11 and is used to form the blade surface 11.

[0056] Specifically, a forming groove is provided on the side of the base mold 2 away from the product film-coating surface 21. The forming groove is used to form the blade root 12. A release module 23 is provided in the forming groove. The release module 23 is used to provide a force point to separate the blade 1 from the base mold 2 when the product is demolded.

[0057] refer to Figures 3-4 As shown, a mold positioning groove 24 is provided on the side wall of the forming groove. The mold positioning groove 24, in conjunction with the positioning section 323 on the connecting section assembly mold 3, is used to position the connecting section assembly mold 3. A mold fastening surface 25 is provided on the side wall of the forming groove away from the mold positioning groove 24. The fastening surface 25, in conjunction with the fastening surface 332, converts the bolt fastening force into forming pressure.

[0058] refer to Figures 3-4 As shown, the basic mold 2 is connected to multiple hanging rings 22. This facilitates the subsequent operation of the mold by lifting it using the hanging rings 22.

[0059] refer to Figures 3-4 As shown, the mold positioning groove 24 has a bolt hole 26 on the side away from the mold fastening surface 25. The bolt hole 26 is a circular through hole. It is used to connect the fixing bolt 325 and the assembly bolt 333 on the connecting section assembly mold 3.

[0060] refer to Figures 3-4 As shown, a pair of movable blocks 27 are engaged on the side of the base mold 2 away from the product film-coating surface 21. The movable blocks 27 are used to smooth the mold's shape, as the mold undergoes significant shape changes during vacuum bag compression molding. Simultaneously, the movable blocks 27 can be removed to facilitate the removal of the release module 23.

[0061] refer to Figures 3-4 As shown, a pair of ejector blocks 28 are connected inside the molding groove. The product inside the molding groove is ejected by the pair of ejector blocks 28 to assist in demolding.

[0062] refer to Figures 3-4 As shown, a pair of ejector holes 29 are provided in the molding groove. The pair of ejector holes 29 are located below the ejector block 28, and both of the ejector holes 29 penetrate the base mold 2. This facilitates the ejection of the ejector block 28 through the ejector holes 29.

[0063] refer to Figures 5-7 As shown, the connecting section assembly mold 3 is located above the base mold 2, and the connecting section assembly mold 3 includes a top mold 31. The top mold 31 is used to ensure the top shape of the blade root 12 is formed.

[0064] refer to Figures 5-7As shown, the top mold 31 has a top forming surface 311 on the side close to the side wall mold 32. The top forming surface 311 is used to ensure the top shape of the blade surface 11 and the blade root 12.

[0065] refer to Figures 5-7 As shown, an overflow groove 312 is provided on the outer side of the top molding surface 311. The overflow groove 312 is used to discharge excess resin material during the molding process, thereby controlling the resin content of the product.

[0066] refer to Figures 5-7 As shown, the outer side of the top mold 31 is provided with multiple positioning pin holes 313 and connecting bolt holes 314. The positioning pin holes 313 cooperate with the positioning pins 322 on the side wall mold 32 to determine the installation position of the top mold 31, thereby improving the convenience and accuracy of assembling the top mold 31.

[0067] Specifically, multiple positioning pin holes 313 and connecting bolt holes 314 are distributed at intervals. The connecting bolt holes 314 are used to tighten the fixing bolts 325, so that the top mold 31 can be tightly and effectively combined with the side wall mold 32.

[0068] refer to Figures 5-7 As shown, the top mold 31 has an auxiliary threaded hole 315. The top mold 31 is moved by the interaction between the auxiliary threaded hole 315 and the auxiliary threaded rod 4.

[0069] refer to Figures 5-8 As shown, a sidewall mold 32 is provided below the top mold 31. The sidewall mold 32 is used to form the sidewall portion of the blade root 12.

[0070] refer to Figures 5-8 As shown, the inner side of the sidewall mold 32 is the sidewall forming surface 321. The sidewall forming surface 321 is used to define the sidewall shape of the blade surface 11 and the blade root 12. Multiple sets of locating pins 322 are fixedly connected to the upper part of the sidewall mold 32, and the locating pins 322 are correspondingly distributed with locating pin holes 313. The top mold 31 is assembled and fixed by engaging the locating pins 322 with the locating pin holes 313 on the top mold 31.

[0071] refer to Figures 5-8 As shown, a positioning section 323 is provided below the sidewall mold 32, and the positioning section 323 cooperates with the mold positioning groove 24. The molding pressure is applied to the sidewall mold 32 through the cooperation between the positioning section 323 and the mold positioning groove 24.

[0072] refer to Figures 5-8As shown, the side of the sidewall mold 32 away from the sidewall forming surface 321 is the pressure surface 324. Multiple fixing bolts 325 are connected to the sidewall mold 302. These fixing bolts 325 are spaced apart from the positioning section 323. Each fixing bolt 325 has a threaded nut 326 at its top. The fixing bolts 325 and the fixing nuts 326 form a fastener assembly. This facilitates the fastening of the top mold 31 and the sidewall mold 32 using the fixing bolts 325 and the fixing nuts 326. The sidewall mold 32 has an auxiliary threaded hole 327, which is used to move the sidewall mold 32 through the interaction of the auxiliary threaded hole 327 and the auxiliary threaded rod 4.

[0073] refer to Figures 5-9 As shown, a fastening mold 33 is provided on the side of the sidewall mold 32 away from the top mold 31. It is used to apply molding pressure to the sidewall portion of the blade root 12.

[0074] refer to Figures 5-9 As shown, the inner side of the fastening mold 33 is a pressure-fitting surface 331, which mates with the pressure surface 324. The pressure-fitting surface 331 mates with the pressure surface 324 of the sidewall mold 32 to apply lateral pressure to the sidewall mold 32.

[0075] refer to Figures 5-9 As shown, the outer side of the fastening mold 33 is a fastening surface 332, which is an inclined surface that mates with the mold fastening surface 25. By setting the fastening surface 332 as an inclined surface, the top mold 31 mates with the mold fastening surface 25, thereby converting the bolt fastening force into a lateral force. Multiple assembly bolts 333 are connected to the top of the fastening mold 33.

[0076] refer to Figures 5-9 As shown, multiple assembly bolts 333 have assembly nuts 334 threaded to both ends, and the assembly bolts 333 and assembly nuts 334 combine to form a fastener assembly. The fastening mold 33 and the base mold 2 are assembled and fixed through the mutual cooperation of the assembly bolts 333 and assembly nuts 334. The fastening mold 33 has multiple second auxiliary threaded holes 335, and the base mold 2 has an auxiliary threaded rod 4 on one side, which matches the second auxiliary threaded holes 335. The fastening mold 33 is moved through the mutual cooperation of the second auxiliary threaded holes 335 and the auxiliary threaded rod 4.

[0077] Specifically, the auxiliary threaded rod 4 consists of two parts: a handle 41 and a threaded post 42. The mold to be transferred is connected through the threaded post 42, and the mold is transferred by applying force to the threaded post 42.

[0078] refer to Figures 14-19 As shown, a method for using a large-size composite material propeller blade forming mold includes the following steps:

[0079] S1. The composite material propeller blade material is laid on the product film surface 21 of the base mold 2. The composite material propeller blade material is adjusted according to the shape and position of the product film surface 21 so that the composite material propeller blade material fits the product film surface 21.

[0080] S2. Assemble the connecting section combination mold 3, insert the positioning section 323 of the side wall mold 32 into the mold positioning groove 24 of the base mold 2, and then assemble the fastening mold 33. Place the fastening mold 33 between the side wall mold 32 and the base mold 2 so that the pressure contact surface 331 cooperates with the pressure surface 324 of the side wall mold 32, and the fastening surface 332 cooperates with the mold fastening surface 25 of the base mold 2. Fasten by inserting and assembling bolts 333.

[0081] S3. Finally, assemble the top mold 31, align the positioning pin hole 313 of the top mold 31 with the positioning pin 322 on the side wall mold 32, and combine the top mold 31 and the side wall mold 32 by insertion. After the combination is completed, tighten the fixing bolt 325 and fixing nut 326 on the side wall mold 32 to complete the mold assembly. If the positioning pin hole cannot be assembled, the assembly bolt 333 and assembly nut 334 of the fastening mold 33 need to be further tightened.

[0082] S4. After the mold is assembled, according to the vacuum bag compression molding process, lay the isolation film and breathable felt on the outside of the mold in sequence, seal the vacuum bag, and put it into the oven to cure and form after vacuuming.

[0083] S5. After molding is completed, remove the vacuum bag and related auxiliary materials, and proceed to the mold removal process;

[0084] S6. During the mold removal process, the top mold 31, fastening mold 33 and side wall mold 32 are removed in sequence. Then, the demolding module 23 and movable stop block 27 on the base mold 2 are removed. The slurry product is separated from the base mold 2 by exposing part of the product. If the product demolding is still difficult, the product is demolded by ejecting the ejector block 28 through the ejector hole 29.

[0085] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0086] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A large-size composite material propeller blade forming mold, characterized in that, include: The blade (1) is composed of two parts: the blade surface (11) and the blade root (12); A base mold (2) is located below the blade (1). A product film-coating surface (21) is provided on one side of the base mold (2). The product film-coating surface (21) matches the blade surface (11). A forming groove is provided on the side of the base mold (2) away from the product film-coating surface (21). A demolding module (23) is provided in the forming groove. A mold positioning groove (24) is provided on the side wall of the forming groove. A mold fastening surface (25) is provided on the side wall of the forming groove away from the mold positioning groove (24). The connecting section combination mold (3) is located above the base mold (2). The connecting section combination mold (3) includes a top mold (31), and a side wall mold (32) is provided below the top mold (31). A fastening mold (33) is provided on the side of the side wall mold (32) away from the top mold (31). The inner side of the sidewall mold (32) is the sidewall forming surface (321). Multiple sets of positioning pins (322) are fixedly connected to the upper part of the sidewall mold (32). The positioning pins (322) are distributed in correspondence with the positioning pin holes (313). The lower part of the sidewall mold (32) is provided with a positioning section (323), which cooperates with the mold positioning groove (24). The side of the sidewall mold (32) away from the sidewall forming surface (321) is the pressure surface (324). The sidewall mold (32) is connected with multiple fixing bolts (325). Multiple sets of fixing bolts (325) are distributed at intervals with the positioning section (323). The top of each fixing bolt (325) is threaded with a fixing nut (326). The fixing bolts (325) and the fixing nuts (326) are combined to form a fastener assembly. The sidewall mold (32) is provided with auxiliary threaded holes. The inner side of the fastening mold (33) is a pressure contact surface (331), which cooperates with the pressure surface (324). The outer side of the fastening mold (33) is a fastening surface (332), which is an inclined surface that cooperates with the mold fastening surface (25). Multiple assembly bolts (333) are connected to the top of the fastening mold (33). Both ends of the multiple assembly bolts (333) are threaded with assembly nuts (334). The assembly bolts (333) and assembly nuts (334) are combined to form a fastener assembly. The fastening mold (33) is provided with multiple second auxiliary threaded holes (335). The base mold (2) is provided with an auxiliary threaded rod (4) on one side. The auxiliary threaded rod (4) matches the second auxiliary threaded holes (335).

2. The large-size composite material propeller blade forming mold according to claim 1, characterized in that, The basic mold (2) is connected to multiple hanging rings (22), and the mold positioning groove (24) is provided with bolt holes (26) on the side away from the mold fastening surface (25). The bolt holes (26) are circular through holes.

3. The large-size composite material propeller blade forming mold according to claim 2, characterized in that, A pair of movable blocks (27) are engaged on the side of the base mold (2) away from the product film surface (21). A pair of ejector blocks (28) are connected in the forming groove. A pair of ejector holes (29) are provided in the forming groove. The pair of ejector holes (29) are located below the ejector blocks (28), and both of the ejector holes (29) penetrate the base mold (2).

4. The large-size composite material propeller blade forming mold according to claim 3, characterized in that, The top mold (31) has a top forming surface (311) on the side close to the side wall mold (32), and an overflow groove (312) is provided on the outer side of the top forming surface (311).

5. The large-size composite material propeller blade forming mold according to claim 4, characterized in that, The top mold (31) has multiple positioning pin holes (313) and connecting bolt holes (314) on its outer side. The multiple positioning pin holes (313) and connecting bolt holes (314) are distributed at intervals. The top mold (31) has auxiliary threaded holes.

6. A method of using the large-size composite material propeller blade forming mold as described in claim 5, characterized in that, Includes the following steps: S1. The composite material propeller blade material is laid on the product film surface (21) of the base mold (2). The composite material propeller blade material is adjusted according to the shape and position of the product film surface (21) so that the composite material propeller blade material fits the product film surface (21). S2. Assemble the connecting section combination mold (3), insert the positioning section (323) of the side wall mold (32) into the mold positioning groove (24) of the base mold (2), and then assemble the fastening mold (33). Place the fastening mold (33) between the side wall mold (32) and the base mold (2) so that the pressure contact surface (331) matches the pressure surface (324) of the side wall mold (32), and the fastening surface (332) matches the mold fastening surface (25) of the base mold (2). Fasten by inserting the assembly bolts (333). S3. Finally, assemble the top mold (31), align the positioning pin hole (313) of the top mold (31) with the positioning pin (322) on the side wall mold (32), and combine the top mold (31) and the side wall mold (32) by plugging them together. After the combination is completed, tighten the fixing bolt (325) and fixing nut (326) on the side wall mold (32) to complete the mold assembly. If the positioning pin hole cannot be combined, the assembly bolt (333) and assembly nut (334) of the fastening mold (33) need to be further tightened. S4. After the mold is assembled, according to the vacuum bag compression molding process, lay the isolation film and breathable felt on the outside of the mold in sequence, seal the vacuum bag, and put it into the oven to cure and form after vacuuming. S5. After molding is completed, remove the vacuum bag and related auxiliary materials, and proceed to the mold removal process; S6. During the mold removal process, the top mold (31), fastening mold (33) and side wall mold (32) are removed in sequence. Then, the demolding module (23) and movable stop block (27) on the base mold (2) are removed. The slurry product is separated from the base mold (2) by exposing part of the product. If the product demolding is still difficult, the product is demolded by ejecting the ejector block (28) through the ejector hole (29).

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