A mold for a high-temperature-resistant composite material stator vane

Abstract

The utility model discloses a kind of mould of high-temperature-resistant composite material stator blade in aerospace technology field, including bottom plate, the bottom plate is buckled with enclosure, the enclosure is provided with pressing plate, the enclosure is formed with cavity, installation slot is opened in the bottom plate, the installation slot and cavity jointly form installation area, lower mould is arranged in the cavity, the upper mould is buckled on the lower mould, side mould assembly is arranged in the cavity.The utility model is formed by stage pressure and sequential die control forming process: first, main profile such as leaf back, leaf basin is compacted alone, ensure that fiber is evenly laid, avoid distortion wrinkle, then closed cavity by side mould assembly, make resin fully soak fiber in low pressure stage, resin has been gelled when last whole die, high pressure is used for compaction and does not cause migration, to synchronously solve fiber distribution uneven and resin migration problem, guarantee the consistency of high-temperature-resistant blade's compactness and mechanical property.

Description

Technical Field

[0001] This utility model relates to the field of aerospace technology, and in particular to a mold for a high-temperature resistant composite material stator blade. Background Technology

[0002] Turbofan engines, as a common type of aero-engine, are undeniably important. For turbofan engines, stator blades are a crucial component. Their role extends beyond improving engine efficiency; they also play a vital role in maintaining aircraft flight stability and safety. For example, during airspeed emission, stator blades can control engine performance and loudness through precise orientation and flow regulation. In coaxial rotor engines, stator blades can also reduce interference and wear between rotating components, thereby improving engine life and reliability. In short, while seemingly simple, the stator blades in a turbofan engine are a critical component of the entire system; their design and performance directly affect the engine's efficiency, lifespan, and safety.

[0003] To achieve a high thrust-to-weight ratio, modern aero engines can increase thrust and reduce structural weight. Composite materials are a new type of material with many excellent characteristics, such as high specific strength, high specific stiffness, and strong designability. Using composite materials to make aero engine structural components can reduce the weight of the components, which is of great significance for improving the overall technical performance of the structure.

[0004] However, during the molding process of high-temperature composite stator blades, fibers are twisted by shear forces at complex curved surfaces (such as the blade root transition area), resulting in wrinkles or gaps, which reduces mechanical properties. At the same time, due to the rapid flow of low-viscosity resin from the fiber gaps under high pressure, resin-rich edges (flash) and dry spots (resin-poor areas) are formed inside. Especially when the viscosity of the high-temperature resistant resin is high, unwetted areas are more likely to form. In addition, resin migration can carry fibers, causing local fiber volume fraction to run out of control, affecting the thermal stability and load uniformity of the blade. Therefore, we propose a mold for high-temperature composite stator blades. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a mold for high-temperature resistant composite stator blades. The molding process is controlled through staged pressure application and sequential mold closing: first, the main surfaces such as the blade back and blade base are compacted separately to ensure that the fibers are evenly laid on the complex curved surfaces and to avoid twisting and wrinkling; then, the triangular area is filled and the mold is locked, so that the resin can fully impregnate the fibers in the low-pressure stage; finally, when the mold is closed as a whole, the resin has gelled, and the high pressure is only used for compaction without causing migration. This simultaneously solves the problems of uneven fiber distribution and resin migration, ensuring the density and mechanical properties of the high-temperature resistant blades.

[0006] The purpose of this utility model is achieved as follows: A mold for a high-temperature resistant composite material stator blade includes a base plate, a retaining wall fastened to the base plate, a pressure plate provided on the retaining wall, a cavity formed on the retaining wall, an installation groove provided on the base plate, the installation groove and the cavity together forming an installation area, a lower mold provided in the cavity, an upper mold fastened to the lower mold, a side mold assembly provided in the cavity for providing lateral pressure, and lifting lugs threadedly connected to both the retaining wall and the pressure plate.

[0007] Optionally, a connecting block is provided at the lower end of the fence, and a connecting groove is provided on the base plate. The connecting block is provided in correspondence with the connecting groove, and the connecting block is inserted into the connecting groove. The fence and the base plate are fixedly connected by screws.

[0008] Optionally, the lower mold contacts the mounting groove, the sidewall of the lower mold fits into the cavity, the sidewall of the upper mold fits into the cavity, and the lower mold and the upper mold are connected by bolts.

[0009] Optionally, the upper mold has a first overflow groove and the lower mold has a second overflow groove. The first overflow groove and the second overflow groove are correspondingly arranged and form an overflow channel for discharging excess gas and resin. The upper mold has a limiting groove and the lower mold has a positioning block. The positioning block is correspondingly arranged with the limiting groove and is inserted into the limiting groove.

[0010] Optionally, the side mold assembly includes a side pressing block, a backhoe block, and an inclined pressing block. The side pressing block contacts the upper mold and the lower mold respectively. A closed cavity is formed between the side pressing block, the lower mold, and the upper mold for compression molding. The backhoe block fits into the cavity. The inclined pressing block is disposed between the side pressing block and the backhoe block. The side wall of the inclined pressing block is inclined and is respectively disposed corresponding to the side pressing block and the backhoe block.

[0011] Optionally, target holes are provided on the side pressure block, the upper mold and the lower mold, and the target holes on the upper mold and the lower mold are symmetrically arranged, with a target inserted into the target hole.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The embodiments provided by this utility model control the molding process by applying pressure in stages and closing the mold sequentially: First, the upper and lower molds are used to compact the main surfaces such as the blade back and blade basin separately to ensure that the fibers are evenly laid on the complex curved surface and avoid twisting and wrinkling. Then, the side mold assembly fills the entire cavity and locks the mold, so that the resin fully impregnates the fibers in the low-pressure stage. Finally, when the mold is closed as a whole, the resin has gelled. The high pressure is only used for compaction and does not cause migration, thereby simultaneously solving the problems of uneven fiber distribution and resin migration, and ensuring the density and mechanical properties of the high-temperature resistant blades.

[0013] 2. By setting up side mold components, the side pressure block, backhoe block, and inclined pressure block work together to provide lateral pressure to the mold. The side pressure block acts directly on the upper and lower molds to ensure uniform pressure on the side walls of the cavity. The backhoe block and inclined pressure block provide lateral pressure when the mold is closed to ensure curing pressure. The inclined side wall of the inclined pressure block cooperates with the side pressure block and backhoe block respectively to convert vertical pressure into horizontal force, while facilitating demolding and improving demolding efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure provided by this utility model.

[0016] Figure 2 This is an exploded view of the overall structure provided by this utility model.

[0017] Figure 3 This is a schematic diagram of the enclosure structure provided by this utility model.

[0018] Figure 4 This is a schematic diagram of the base plate structure provided by this utility model.

[0019] Figure 5 This is a schematic diagram of the upper mold structure provided by this utility model.

[0020] Figure 6 This is a schematic diagram of the lower mold structure provided by this utility model.

[0021] Figure 7 This is a schematic diagram of the side mold assembly structure provided by this utility model.

[0022] In the diagram: 1. Base plate; 11. Enclosure; 12. Pressure plate; 13. Lifting lug; 14. Cavity; 15. Connecting block; 16. Connecting groove; 17. Mounting groove; 2. Upper mold; 21. First overflow groove; 22. Limiting groove; 3. Lower mold; 31. Second overflow groove; 32. Positioning block; 4. Side mold assembly; 41. Side pressure block; 42. Backhoe block; 43. Angled pressure block; 5. Target hole; 51. Target component. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1 to 7 The mold for a high-temperature resistant composite stator blade shown includes a base plate 1, a retaining wall 11 fastened to the base plate 1, a pressure plate 12 provided on the retaining wall 11, a cavity 14 formed on the retaining wall 11, an installation groove 17 provided on the base plate 1, the installation groove 17 and the cavity 14 together form an installation area, a lower mold 3 is provided in the cavity 14, an upper mold 2 is fastened to the lower mold 3, a side mold assembly 4 is provided in the cavity 14 to provide lateral pressure, lifting lugs 13 are threadedly connected to both the retaining wall 11 and the pressure plate 12, the lower mold 3 contacts the installation groove 17, the side wall of the lower mold 3 fits against the cavity 14, the side wall of the upper mold 2 fits against the cavity 14, and the lower mold 3 and the upper mold 2 are connected by bolts.

[0025] Furthermore, the embodiments provided by this utility model adopt a modular design, mainly consisting of a base plate 1, a enclosure 11, and a pressure plate 12 forming the main frame. The interior is equipped with upper and lower molds 3 and side mold components 4 that cooperate with each other. The mounting groove 17 of the base plate 1 and the cavity 14 of the enclosure 11 form the mold installation area. The lower mold 3 and the upper mold 2 are precisely aligned by a target part 51. The side pressure block 41, the lower mold 3, and the upper mold 2 form a cavity. The cavity is closed by bolt fastening. The side mold component 4 includes a side pressure block 41, a backhoe block 42, and an inclined pressure block 43, which can provide lateral compaction pressure. The inclined surface design of the inclined pressure block 43 can effectively convert the pressure direction and facilitate demolding.

[0026] Specifically, a connecting block 15 is provided at the lower end of the enclosure 11, and a connecting groove 16 is provided on the base plate 1. The connecting block 15 and the connecting groove 16 are correspondingly provided, and the connecting block 15 and the connecting groove 16 are inserted into each other. The enclosure 11 and the base plate 1 are fixedly connected by screws.

[0027] Furthermore, by cooperating with the connecting block 15 and the connecting groove 16, the enclosure 11 and the base plate 1 are accurately positioned, improving assembly efficiency and ensuring the perpendicularity and coaxiality of the enclosure 11 and the base plate 1. Compared with traditional welded or integral casting structures, it has better maintainability and adjustability. When the mold is partially damaged, the enclosure 11 or the base plate 1 can be replaced separately, reducing maintenance costs.

[0028] Specifically, the upper mold 2 has a first overflow groove 21 and the lower mold 3 has a second overflow groove 31. The first overflow groove 21 and the second overflow groove 31 are correspondingly arranged and form an overflow channel for discharging excess gas and resin. The upper mold 2 has a limiting groove 22 and the lower mold 3 has a positioning block 32. The positioning block 32 is correspondingly arranged and is inserted into the limiting groove 22.

[0029] Furthermore, the continuous channel formed by the first overflow groove 21 and the second overflow groove 31 can effectively discharge excess resin and gas during the molding process, reduce air bubbles and glue shortage defects inside the stator blade, and improve the yield. At the same time, the insertion and cooperation between the positioning block 32 and the limiting groove 22 ensures precise alignment of the upper mold 2 and the lower mold 3, reduces mold closing error, and ensures the dimensional accuracy of the blade profile. This can not only solve the problem of venting and discharging glue in composite material molding, but also avoid the problem of uneven thickness caused by misalignment in traditional molds. Especially under high temperature and high pressure conditions, the overflow channel can adjust the internal pressure distribution, while the precision positioning structure can maintain the stability of the mold, so that the stator blade has a more uniform fiber distribution and mechanical properties.

[0030] Specifically, the side mold assembly 4 includes a side pressing block 41, a backhoe block 42, and an inclined pressing block 43. The side pressing block 41 contacts the upper mold 2 and the lower mold 3 respectively. A closed cavity is formed between the side pressing block 41, the lower mold 3, and the upper mold 2 for compression molding. The backhoe block 42 fits into the cavity 14. The inclined pressing block 43 is disposed between the side pressing block 41 and the backhoe block 42. The side wall of the inclined pressing block 43 is inclined and is respectively disposed corresponding to the side pressing block 41 and the backhoe block 42.

[0031] Furthermore, the side pressure block 41 forms a closed cavity with the upper mold 2 and the lower mold 3 to ensure the accuracy of the blade profile. The backhoe block 42 provides stable support to prevent the cavity from deforming. The inclined pressure block 43 uses its inclined sidewall to convert vertical pressure into lateral pressure, which enhances the compaction effect on the composite material layer. At the same time, it reduces the difficulty of demolding, improves demolding efficiency, eliminates common problems such as loose edges and uneven thickness, and enables the composite material to obtain a denser fiber arrangement and a more uniform resin distribution during high-temperature curing, thereby improving the structural strength and dimensional stability of the blade.

[0032] Specifically, target holes 5 are provided on the side pressure block 41, the upper mold 2 and the lower mold 3. The target holes 5 on the upper mold 2 and the lower mold 3 are symmetrically arranged, and a target part 51 is inserted into the target hole 5.

[0033] Furthermore, by symmetrically opening target holes 5 on the upper mold 2, lower mold 3, and side pressure block 41 and inserting target parts 51, rapid and accurate positioning is achieved. First, the insertion and mating of target parts 51 can realize automatic alignment of multiple modules, improve assembly accuracy, and increase mold closing efficiency. Second, it can ensure that each module maintains a stable relative position under high temperature and high pressure conditions. In addition, the target system can be used with optical inspection equipment for online calibration, which facilitates quality monitoring during the production process, ensures product consistency and interchangeability, reduces reliance on the technical skills of operators, and improves the yield rate of production products.

[0034] Working principle: First, composite prepreg is laid in the mold surface of the lower mold 3 to form the blade back part. After the layup is completed, the upper mold 2 is then fastened to the lower mold 3. The upper mold 2 and the lower mold 3 are precisely aligned by the cooperation of the positioning block 32 and the limiting groove 22, and then locked with bolts so that the laid prepreg forms the blade basin part. At the same time, the outer surface material of the hanging lug is laid on the side pressure block 41. Then, composite material is added to the triangular area between the side pressure block 41, the lower mold 3 and the upper mold 2. Then, the lower mold 3, the upper mold 2 and the side pressure block 41 are placed on the base plate 1. The enclosure 11, the backhoe block 42 and the inclined pressure block 43 are installed in sequence. After assembly, pre-pressing and curing are performed. Then, the mold is demolded in the order of first the inclined pressure block 43, the backhoe block 42, then the enclosure 11 and the side pressure block 41, and finally the bolts of the upper and lower molds 3 are loosened. Finally, the molded blade is taken out and the mold is cleaned.

[0035] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A mold for a high-temperature resistant composite material stator blade, comprising a base plate (1), characterized in that: A barrier (11) is fastened to the base plate (1), a pressure plate (12) is provided on the barrier (11), a cavity (14) is formed on the barrier (11), an installation groove (17) is provided on the base plate (1), the installation groove (17) and the cavity (14) together form an installation area, a lower mold (3) is provided in the cavity (14), an upper mold (2) is fastened to the lower mold (3), a side mold assembly (4) is provided in the cavity (14) to provide lateral pressure, and lifting lugs (13) are threadedly connected to both the barrier (11) and the pressure plate (12).

2. The mold for a high-temperature resistant composite material stator blade according to claim 1, characterized in that: The lower end of the enclosure (11) is provided with a connecting block (15), and the bottom plate (1) is provided with a connecting groove (16). The connecting block (15) and the connecting groove (16) are respectively provided. The connecting block (15) and the connecting groove (16) are inserted into each other. The enclosure (11) and the bottom plate (1) are fixedly connected by screws.

3. The mold for a high-temperature resistant composite material stator blade according to claim 1, characterized in that: The lower mold (3) contacts the mounting groove (17), the side wall of the lower mold (3) fits against the cavity (14), the side wall of the upper mold (2) fits against the cavity (14), and the lower mold (3) and the upper mold (2) are connected by bolts.

4. The mold for a high-temperature resistant composite material stator blade according to claim 1, characterized in that: The upper mold (2) is provided with a first overflow groove (21), and the lower mold (3) is provided with a second overflow groove (31). The first overflow groove (21) and the second overflow groove (31) are correspondingly arranged. The first overflow groove (21) and the second overflow groove (31) form an overflow channel for discharging excess gas and resin. The upper mold (2) is provided with a limiting groove (22), and the lower mold (3) is provided with a positioning block (32). The positioning block (32) is correspondingly arranged with the limiting groove (22), and the positioning block (32) is inserted into the limiting groove (22).

5. The mold for a high-temperature resistant composite material stator blade according to claim 1, characterized in that: The side mold assembly (4) includes a side pressure block (41), a backhoe block (42), and an inclined pressure block (43). The side pressure block (41) contacts the upper mold (2) and the lower mold (3) respectively. A closed cavity is formed between the side pressure block (41), the lower mold (3), and the upper mold (2) for compression molding. The backhoe block (42) fits into the cavity (14). The inclined pressure block (43) is disposed between the side pressure block (41) and the backhoe block (42). The side wall of the inclined pressure block (43) is inclined. The side wall of the inclined pressure block (43) is respectively disposed corresponding to the side pressure block (41) and the backhoe block (42).

6. The mold for a high-temperature resistant composite material stator blade according to claim 5, characterized in that: The side pressure block (41), the upper mold (2) and the lower mold (3) are all provided with target holes (5). The target holes (5) on the upper mold (2) and the lower mold (3) are symmetrically arranged, and a target part (51) is inserted into the target hole (5).

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