A co-cured composite drive shaft forming tool

Abstract

The utility model discloses a kind of co-cured composite material transmission shaft forming tool, including upper die, lower die and two cover plates;The upper die, lower die and two cover plates are closed to form the forming cavity of composite material transmission shaft;Two ends of the forming cavity have metal joint cavity.The utility model forms accurate composite material transmission shaft forming cavity by the close cooperation of upper die, lower die and two cover plates, ensure the effective control of size accuracy and shape accuracy during forming process, improve the overall quality of product, in addition, the metal joint cavity designed at the two ends of forming cavity, so that metal joint and composite material can be co-cured in the same process, strengthen the bonding strength between metal joint and composite material, improve the overall performance and reliability of transmission shaft.

Description

Technical Field

[0001] This utility model relates to the field of composite material molding technology, and in particular to a molding fixture for a co-cured composite material drive shaft. Background Technology

[0002] Most existing aircraft driveshaft systems use metal driveshafts. Due to the properties of metal materials, metal driveshafts are heavy, have a low maximum torque capacity, and poor fatigue resistance. Meanwhile, the continuous decline in the price of composite materials in recent years has led to an increasing number of aircraft using composite materials, and their usage is further increasing. Composite materials are lightweight, strong, and have high fatigue resistance. Therefore, under the same structural strength conditions, they can significantly reduce the structural weight of aircraft. Since the aircraft driveshaft system accounts for a large proportion of the overall weight, the weight reduction effect of reducing the driveshaft is particularly significant.

[0003] To address these issues, the industry has begun exploring co-curing composite material driveshaft molding technology. Co-curing technology refers to simultaneously curing the metal joint and the composite material in the same process to form an integrated driveshaft structure. This technology not only improves the overall performance of the driveshaft but also simplifies the manufacturing process and reduces costs. However, implementing co-curing molding technology requires specialized tooling to ensure the stability of the molding process and the quality of the molding.

[0004] Most existing co-cured composite material drive shaft molding fixtures have design deficiencies. For example, unreasonable structural design of the fixtures leads to insufficient precision of the molding cavity, affecting the dimensional and shape accuracy of the drive shaft; the fixtures lack effective venting and overflow mechanisms, preventing gas from escaping smoothly during molding and allowing excess resin material to overflow, thus affecting the internal and external quality of the drive shaft; in addition, the operability and maintainability of the fixtures need improvement, such as the lack of convenient lifting and demolding structures, as well as reliable positioning and guiding mechanisms.

[0005] Therefore, it is necessary to design a co-curing composite material drive shaft molding tool to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a co-curing composite material drive shaft molding tool.

[0007] The technical solution of this utility model is: a co-curing composite material drive shaft molding fixture, including an upper mold, a lower mold and two cover plates; the upper mold, the lower mold and the two cover plates are closed to form a molding cavity for the composite material drive shaft; the two ends of the molding cavity have metal joint cavities.

[0008] The upper and lower molds are symmetrically equipped with lifting rings at both ends of their side walls.

[0009] The upper mold has symmetrical mold-lifting grooves at both ends.

[0010] The upper and lower molds are provided with two guide column grooves at corresponding positions, and the two guide column grooves are arranged in a centrally symmetrical manner.

[0011] The lower mold has symmetrically distributed venting grooves on both sides that communicate with the lower mold cavity.

[0012] The lower mold cavity is provided with overflow grooves on both sides symmetrically.

[0013] Both ends of the upper and lower molds are provided with threaded holes and positioning holes that connect to the cover plate.

[0014] The metal joint cavity is formed by the upper mold cavity, the lower mold cavity, and the metal joint clearance groove on the pressure cap.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects: (1) The present invention forms a precise composite material drive shaft molding cavity through the close cooperation of the upper mold, lower mold and two cover plates, which ensures the effective control of the dimensional accuracy and shape accuracy of the drive shaft during the molding process, and improves the overall quality of the product. In addition, the metal joint cavity designed at both ends of the molding cavity enables the metal joint and the composite material to be co-cured in the same process, which enhances the bonding strength between the metal joint and the composite material and improves the overall performance and reliability of the drive shaft.

[0016] (2) The lifting rings symmetrically arranged at both ends of the upper and lower mold sides and the mold release grooves symmetrically arranged at both ends of the upper mold provide a convenient operation method for the hoisting and mold release of the tooling, reduce the operation difficulty and improve the production efficiency.

[0017] (3) The two guide column grooves provided on the upper and lower molds of this utility model not only ensure the positioning accuracy of the tooling when the mold is closed, but also make the mold closing process smoother and avoid molding defects caused by inaccurate positioning.

[0018] (4) The venting grooves symmetrically distributed on both sides of the lower mold and the overflow grooves symmetrically arranged on both sides of the lower mold cavity of this utility model can ensure that the gas is discharged smoothly during the molding process and that excess resin material overflows in time, thereby avoiding internal defects and appearance flaws caused by gas residue or resin accumulation.

[0019] (5) The threaded holes at both ends of the upper and lower molds of this utility model, which are connected to the cover plate, make the connection between the various parts of the tooling more secure and reliable, while simplifying the disassembly process and improving the maintainability and service life of the tooling.

[0020] (6) The metal joint cavity of this utility model is formed by the upper mold cavity, the lower mold cavity and the metal joint clearance groove on the pressure cover. This design enables the tooling to adapt to metal joints of different shapes and sizes, improving the versatility and flexibility of the tooling. Attached Figure Description

[0021] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a schematic diagram of the upper mold of this utility model.

[0024] Figure 3 This is a schematic diagram of the lower mold of this utility model.

[0025] Figure 4 This is a schematic diagram of the structure of the cover plate of this utility model.

[0026] The labels in the attached diagram are:

[0027] Upper mold 1, lower mold 2, cover plate 3, mold release groove 4, guide post groove 5, venting groove 6, overflow groove 7, threaded hole 8, lifting ring 9, metal joint clearance groove 10, positioning hole 11. Detailed Implementation

[0028] (Example 1)

[0029] See Figures 1 to 4 This embodiment of a co-curing composite material drive shaft molding fixture includes an upper mold 1, a lower mold 2, and two cover plates 3; after the upper mold 1, lower mold 2, and two cover plates 3 are closed, a molding cavity for the composite material drive shaft is formed; the two ends of the molding cavity have metal joint cavities.

[0030] Furthermore, lifting rings 9 are symmetrically provided at both ends of the side walls of the upper mold 1 and the lower mold 2, which provides a convenient way to lift and release the tooling, reduces the difficulty of operation, and improves production efficiency.

[0031] Furthermore, the upper mold 1 is provided with symmetrical mold release grooves 4 at both ends to facilitate the separation of the upper mold 1 and the lower mold 2.

[0032] Furthermore, two guide grooves 5 are provided on the upper mold 1 and the lower mold 2 respectively, and the two guide grooves 5 are arranged symmetrically at the center to ensure the accuracy of mold closing of the upper mold 1 and the lower mold 2.

[0033] Furthermore, the lower mold 2 has symmetrically distributed venting grooves 6 on both sides that communicate with the cavity of the lower mold 2, which avoids the generation of internal defects in the transmission shaft due to poor air circulation during curing.

[0034] Furthermore, the lower mold 2 cavity is provided with overflow grooves 7 symmetrically on both sides.

[0035] Furthermore, both ends of the upper mold 1 and the lower mold 2 are provided with threaded holes 8 and positioning holes 11 that are connected to the cover plate 3. The positioning holes 11 determine the relative position of the metal joint and the drive shaft, and the positioning holes 11 do not penetrate the cover plate 3, so as to facilitate the installation and disassembly of the cover plate 3.

[0036] Furthermore, the metal joint cavity is formed by the upper mold cavity 1, the lower mold cavity 2, and the metal joint clearance groove 10 on the gland, which enables the tooling to adapt to metal joints of different shapes and sizes, thereby improving the versatility and flexibility of the tooling.

[0037] The co-curing composite material drive shaft molding fixture of this embodiment not only improves the molding accuracy and stability of the drive shaft, but also optimizes the co-curing effect of the metal joint and the composite material. At the same time, it simplifies the operation and maintenance process of the fixture, and has significant technical progress and practical value.

[0038] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tooling for forming a co-cured composite material drive shaft, characterized in that: It includes an upper mold (1), a lower mold (2) and two cover plates (3); after the upper mold (1) and the lower mold (2) are closed and the two cover plates (3) are closed, a molding cavity for a composite material drive shaft is formed; the two ends of the molding cavity have metal joint cavities.

2. The co-curing composite material drive shaft forming fixture according to claim 1, characterized in that: The upper mold (1) and the lower mold (2) are provided with symmetrical lifting rings (9) at both ends of their side walls.

3. The co-curing composite material drive shaft forming fixture according to claim 1, characterized in that: The upper mold (1) is provided with mold release grooves (4) symmetrically at both ends.

4. The co-curing composite material drive shaft forming fixture according to claim 1, characterized in that: The upper mold (1) and the lower mold (2) are provided with two guide grooves (5) corresponding to each other, and the two guide grooves (5) are arranged in a centrally symmetrical manner.

5. The co-curing composite material drive shaft forming fixture according to claim 1, characterized in that: The lower mold (2) has venting grooves (6) that are symmetrically distributed on both sides and communicate with the cavity of the lower mold (2).

6. The co-curing composite material drive shaft forming fixture according to claim 1, characterized in that: The lower mold (2) cavity is provided with overflow grooves (7) on both sides symmetrically.

7. The co-curing composite material drive shaft molding fixture according to claim 1, characterized in that: Both ends of the upper mold (1) and the lower mold (2) are provided with threaded holes (8) and positioning holes (11) that are connected to the cover plate (3).

8. The co-curing composite material drive shaft forming fixture according to claim 1, characterized in that: The metal connector cavity is formed by the upper mold (1) cavity, the lower mold (2) cavity, and the metal connector clearance groove (10) on the gland.

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