Anti-deformation clamp type tool for large prefabricated body

Abstract

The invention relates to an anti-deformation clamp type tool for a large prefabricated body, the clamp type tool is composed of an angular clamp type tool and a graphite rope, the angular clamp is used for clamping an octagonal prism, and the octagonal prism is bound through the graphite rope. The angle clamp type tool is made of graphite. The angular clamp type tool adopts a ventilated square punching design, so that a gas carbon source can better enter the prefabricated body in the isothermal chemical vapor deposition process; the included angle of the angle clamp type tool is 135 degrees. And the positions of the wire slots of the prisms are convenient to bind more firmly without damaging the edges and corners of the prefabricated body. According to the anti-deformation clamp type tool in the deposition process of the large prefabricated body, the carbon fiber prefabricated body subjected to high-temperature treatment is clamped through the clamp type tool, external force is provided for supporting, the deposited prefabricated body is disassembled after the strength of the deposited prefabricated body is improved, and the carbon fiber prefabricated body is prevented from being twisted and shaped in the subsequent deposition process.

Description

Technical Field

[0001] This invention patent belongs to the technical field of carbon / carbon composite material preparation equipment, specifically relating to a large preform anti-deformation fixture. Background Technology

[0002] Carbon / carbon composites are a crucial material choice for ablation-resistant structural components in solid thrust systems, and their performance directly impacts the success of the system's operation. Carbon / carbon composites refer to carbon fiber reinforced carbon matrix composites, where carbon fibers act as the skeleton and reinforcement phase, while the carbon matrix serves as the matrix phase; both factors jointly influence the performance of the composite. Triaxially wound carbon fiber preforms, as a representative example, have attracted attention due to their superior performance and ease of weaving for large-volume carbon fiber production. However, the following problems currently exist in the preparation of carbon / carbon composites using triaxially wound carbon fiber preforms: Before preparing the carbon matrix, carbon fiber preforms need to be treated at high temperatures to remove sizing agents and other adhesives, as well as non-carbon elements, from the carbon fiber surface. This roughens the carbon fiber surface. During the preparation of the carbon matrix, the "anchoring phenomenon" of the rough surface makes the carbon fiber bond more tightly to the carbon matrix, thereby improving strength. However, the high-temperature treatment causes the carbon fiber preform to lose the sizing agents and other adhesives, reducing its mechanical support and leading to distortion. This problem is particularly noticeable in large-volume carbon fiber preforms.

[0003] Isothermal chemical vapor deposition (CVD) is a commonly used process for carbon / carbon composite materials. A carbon fiber preform is placed in an CVD furnace at 800–1100°C, where the carbon source in the deposition gas pyrolyzes on the carbon fiber surface to form deposited pyrolytic carbon. After this high-temperature treatment, the twisted state of the carbon fiber preform during deposition is fixed due to the deposited carbon penetrating the preform. This results in the preform's carbon fibers being in a twisted state. Furthermore, the carbon / carbon composite material made from this twisted preform cannot fully utilize the carbon fiber's properties due to fiber bending, leading to performance degradation. Additionally, the twisted carbon fibers require further machining to meet the requirements of the manufactured components, resulting in reduced economic efficiency.

[0004] Existing technologies do not have effective tooling to solve the problem of deposition, distortion and deformation of large carbon fiber preforms after high-temperature treatment.

[0005] This can lead to the preform being machined away, and the performance of the resulting carbon / carbon composite material will also be reduced due to the twisting of the carbon fibers.

[0006] Currently, there is a lack of effective and versatile tooling design applications for preventing deformation during the high-temperature treatment-isothermal chemical vapor deposition process of large-size carbon fiber preforms. Summary of the Invention

[0007] For the high-temperature treatment-isothermal chemical vapor deposition process of large-size carbon fiber preforms, the present invention provides a deformation prevention tooling for the deposition process of large preforms. This tooling is designed with angular clamp-type tooling for common octagonal carbon fiber preforms and is supplemented with high-temperature resistant graphite ropes or wires for binding, thereby solving the problem.

[0008] To solve the above-mentioned technical problems, one of the objectives of this invention is to provide a large prefabricated anti-deformation fixture, which is composed of an angular fixture and a graphite rope. The angular fixture clamps the octagonal prism and binds it with the graphite rope.

[0009] Furthermore, the angled clamp-type tooling is made of graphite.

[0010] Furthermore, the angled fixture adopts a ventilated square perforation design, which allows the gaseous carbon source to better enter the interior of the preform during the isothermal chemical vapor deposition process. Furthermore, the included angle of the angled fixture is 135 degrees.

[0011] Furthermore, the grooves on the prism are positioned to ensure a more secure binding without damaging the edges of the prefabricated body.

[0012] The above-mentioned one or more technical solutions of the present invention have at least one or more of the following technical effects: The anti-deformation clamping fixture provided by the present invention clamps the carbon fiber preform after high temperature treatment, provides external force support, and removes it after the strength of the deposited preform is improved, thus avoiding the distortion and shaping of the carbon fiber preform during the subsequent deposition process. Attached Figure Description

[0013] Figure 1 : Front view of the tooling structure of the present invention; Figure 2 : Side view of the structure of the present invention; Figure 3 : Schematic diagram of tooling usage. Detailed Implementation

[0014] The present invention relates to a tooling for preventing deformation and twisting during the deposition of large carbon fiber preforms, comprising an angular clamp type tooling and a graphite rope, wherein the angular clamp holds an octagonal prism and is bound by the graphite rope. This invention relates to an angular clamping fixture designed to resist deformation of large octagonal carbon fiber preforms during high-temperature treatment-isothermal chemical vapor deposition (CVD) processes. The fixture is made of graphite, and a single set consists of eight angular clamping fixtures bound with high-temperature resistant graphite ropes or wires. This provides excellent resistance to preform deformation and good versatility, improving the performance and process economy of large-size carbon / carbon composite materials. The fixture features a perforated square design, allowing for better entry of the gaseous carbon source into the preform during CVD. The fixture's design conforms to the angular stress distribution of the large octagonal carbon fiber preforms. Since this portion is a negative mass for carbon / carbon composite materials used in a certain ablation-resistant structural component of a solid thrust system and will be machined off later, it has virtually no negative impact on the preform's performance.

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments obtained. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0016] A large prefabricated anti-deformation fixture, specifically as follows: Figure 1-2 As shown. This invention employs an angular clamp-type tooling design to fit the corners of a large octagonal carbon fiber preform under stress, which has almost no negative impact on the performance of the carbon / carbon composite material subsequently prepared from the preform. This invention uses an 8-corner clamp-type tooling, supplemented by a design consisting of high-temperature resistant graphite ropes or wires for binding, which has versatility for different sizes and is simple to operate and assemble. This invention uses a ventilated square perforation design, which allows the gaseous carbon source to better enter the interior of the preform during isothermal chemical vapor deposition. This invention designs prism groove positions for more secure binding without damaging the corners of the preform.

[0017] Example of this invention: The present invention discloses a large preform anti-deformation fixture, which is implemented as follows: The large carbon fiber preform undergoes high-temperature treatment and is used as follows... Figures 1-2 The carbon fiber preform shown is softened after being treated to remove the adhesive. The eight prisms of the octagon are clamped using an angled clamping fixture and bound with high-temperature resistant graphite ropes or wires to provide external support. After the deposition process is completed, pyrolytic carbon is generated inside the preform to improve its mechanical strength. After solving the problem of preform deformation, it is then removed.

[0018] The aforementioned large precast body anti-deformation clamping fixture consists of a set of eight angular clamping fixtures, supplemented by high-temperature resistant graphite ropes or wires for binding. The working principle diagram is shown below. Figure 3 As shown.

[0019] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations to the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A large prefabricated body anti-deformation clamping fixture, characterized in that: The fixture consists of an angular fixture and a graphite rope. The angular fixture holds the octagonal prism and is bound by the graphite rope.

2. The large prefabricated body anti-deformation fixture according to claim 1, characterized in that... The angled clamp-type tooling is made of graphite.

3. The large prefabricated body anti-deformation fixture according to claim 1, characterized in that: The angled fixture-type tooling adopts a ventilated square perforation design, which allows the gaseous carbon source to better enter the interior of the preform during the isothermal chemical vapor deposition process.

4. The large prefabricated body anti-deformation fixture according to claim 1, characterized in that: The included angle of the angled fixture is 135 degrees.

5. The large prefabricated body anti-deformation fixture according to claim 1, characterized in that: The grooves on the prisms are positioned to ensure a more secure binding without damaging the edges of the precast structure.

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