A memory core mold for co-curing molding of composite material Ω-shaped long-string reinforced wall panels

Abstract

The utility model discloses a memory core mold for co-curing and molding composite material Ω-shaped long-beam reinforced wall panels, comprising a core mold body, the core mold body is a sealed hollow core mold, one end or both ends of the core mold body are provided with a gas nozzle interface, the core mold body comprises an inner matrix rubber layer, the outer surface of the inner matrix rubber layer is compositely connected with a thermoplastic layer b, the outer surface of the thermoplastic layer b is compositely connected with a thermoplastic layer a, the outer surface of the thermoplastic layer a is compositely connected with an outer matrix rubber layer, thermoplastic particles are evenly distributed in the core mold body, a thermal resistance wire is evenly laid between the two thermoplastic layers, a reinforcement layer is provided between the lower surface of the thermoplastic layer a and the outer matrix rubber layer, and a fault is provided at the R foot position of the top side of the two thermoplastic layers. The utility model is easy to demould, has good laying pressure bearing capacity, and can be repeatedly used.

Description

Technical Field

[0001] The utility model relates to the technical field of composite material molding, in particular to a memory core mold used for co-curing molding of composite material Ω-shaped long-string reinforced wall panels. Background Art

[0002] As the market's requirements for the strength and stiffness of composite parts continue to increase, the structure of parts is becoming more and more complex, among which wall panels with cavity structures are one of the typical structural parts.

[0003] Composite fuselage panels are usually Ω-shaped long stringer reinforced panel structures. In order to ensure the connection strength and quality between the skin and the Ω-shaped long stringer reinforcement, simplify the assembly process, reduce the assembly tasks, and reduce the use of assembly tools and fasteners, a co-curing molding process is often used, that is, the panel skin and the Ω-shaped long stringer are cured at the same time. During the co-curing molding process of the panel, it is necessary to fill the core mold in the inner cavity of the Ω-shaped long stringer. During the stacking process, the core mold can play a shape-preserving and supporting role to ensure the stacking quality; during the curing process, the pressure in the autoclave can be evenly transferred to the inner cavity of the long stringer through the core mold to ensure the curing quality. For this reason, the performance and quality of the core mold directly affect the co-curing molding quality of the panel.

[0004] Commonly used composite co-cured reinforced wall panel core molds mainly include solid rubber core molds, soluble salt core molds and combined core molds. Solid rubber core molds rely on thermal expansion to pressurize, and the pressure value is difficult to control; in addition, if the size of the solid rubber core mold is long, it will lead to difficulty in demoulding, and it is easy to deform after demoulding, and the service life is short. The soluble salt core mold is made by milling solid soluble salt blank material. When demoulding, the soluble salt material can be washed and dissolved with water; the soluble salt core mold has low toughness and is easy to break during operation; secondly, the soluble salt core mold indirectly transfers the tank pressure to the long stringer, and the pressurization quality is difficult to guarantee; thirdly, the soluble salt core mold cannot be reused. The combined core mold usually adopts the form of rubber core + rubber tube. When laying, the rubber core plays a supporting role; before curing, the rubber core is pulled out, and the tank pressure is evenly transferred to the inner cavity of the long stringer through the rubber tube; however, when the core mold size is long, the rubber core is difficult to pull out from the rubber tube, and during the extraction process, the rubber core is prone to displacement and deformation, affecting the curing effect. In order to solve the above problems, the utility model proposes a memory core mold for co-curing molding of composite material Ω-shaped long-string reinforced wall panels. Utility Model Content

[0005] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the utility model is to provide a memory core mold for co-curing and molding composite material Ω-shaped long-string reinforced wall panels, which is easy to demould, has good laying pressure bearing capacity, and can be reused multiple times.

[0006] The technical solution is as follows:

[0007] A memory core mold for co-curing molding of composite material Ω-shaped long-beam reinforced wall panels, comprising a core mold body, the core mold body is a sealed hollow core mold, one end or both ends of the core mold body are provided with a gas nozzle interface, the core mold body comprises an inner matrix rubber layer, the outer surface of the inner matrix rubber layer is compositely connected with a thermoplastic layer b, the outer surface of the thermoplastic layer b is compositely connected with a thermoplastic layer a, the outer surface of the thermoplastic layer a is compositely connected with an outer matrix rubber layer, thermoplastic particles are evenly distributed in the core mold body, a thermal resistance wire is evenly laid between the two thermoplastic layers, a reinforcement layer is provided between the lower surface of the thermoplastic layer a and the outer matrix rubber layer, and a fault is provided at the R-foot position of the top side of the two thermoplastic layers.

[0008] Furthermore, the core mold body is composed of six surfaces: top, bottom, left, right, front and back. The cross-section of the core mold body is a trapezoidal structure, the lower surface is the large end of the trapezoid, and the four corners of the trapezoidal structure are R angle positions.

[0009] Furthermore, the thermal resistance wire is evenly distributed in a wave shape between the thermoplastic layer a and the thermoplastic layer b.

[0010] Furthermore, the reinforcement layer is to increase the number of base rubber layers or thermoplastic layers, and the increased number is at least one base rubber layer or one thermoplastic layer.

[0011] Furthermore, the thermoplastic particles are evenly distributed and dispersed between the outer matrix rubber layer and the thermoplastic layer a and between the thermoplastic layer b and the inner matrix rubber layer.

[0012] Furthermore, the fault sections at the R-leg positions on the top sides of the two thermoplastic layers are connected between the inner base rubber layer and the outer base rubber layer via the base rubber layer.

[0013] Beneficial effects of the utility model:

[0014] 1. By arranging two thermoplastic layers on the core mold body and dispersing a number of thermoplastic particles, not only the core mold body has good rigidity and pressure bearing strength at room temperature, but also the core mold body can soften and shrink after heating, which makes it easier to demould the core mold body.

[0015] 2. The utility model adds a thermal resistance wire inside the core mold body, so that the core mold can be assisted by thermocouple heating during the demolding process, so that the core mold body can maintain a softened state for a long time to facilitate demolding, making it easier to demold the core mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model.

[0019] Figure 3 for Figure 2 A is a schematic diagram of the enlarged structure.

[0020] Figure 4 It is a structural schematic diagram of the utility model in the pressure filling state.

[0021] Figure 5 It is a structural schematic diagram of the utility model in the demoulding state.

[0022] Figure 6 It is a structural schematic diagram of the utility model in the shape correction state.

[0023] In the figure: 1. core mold body; 2. base rubber layer; 3. thermoplastic reinforcement particles; 4. thermoplastic layer a; 5. thermoplastic layer b; 6. thermal resistance wire; 7. reinforcement layer; 8. fault; 9. air nozzle interface; 10. tooling; 11. chamber; 12. long stringer; 13. air nozzle; 14. skin; 15. shape correction tooling; 16. heating rod. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0025] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] See also Figures 1 to 5 As shown, a memory core mold for co-curing molding of composite material Ω-shaped long-beam reinforced wall panels includes a core mold body 1, which is a sealed hollow core mold. One end or both ends of the core mold body 1 are provided with an air nozzle interface 9, and the air nozzle interface 9 is connected to an air nozzle. The core mold body 1 can be externally connected to a pressurized air nozzle via the air nozzle, and can also be externally connected to a vacuum air nozzle.

[0027] The core mold body 1 is composed of six surfaces: upper, lower, left, right, front and rear. The cross section of the core mold body 1 is a trapezoidal structure, the lower surface is the large end of the trapezoid, and the four corners of the trapezoidal structure are R angle positions.

[0028] like Figure 2 and Figure 3 The core mold body 1 includes an inner base rubber layer 2, the outer surface of the inner base rubber layer 2 is compositely connected with a thermoplastic layer b5, the outer surface of the thermoplastic layer b5 is compositely connected with a thermoplastic layer a4, the outer surface of the thermoplastic layer a4 is compositely connected with an outer base rubber layer 2, a reinforcing layer 7 is provided between the lower surface of the thermoplastic layer a4 and the outer base rubber layer 2, and a fault 8 is provided at the R-foot position on the top side of the two thermoplastic layers.

[0029] like Figure 2 As shown, the reinforcing layer 7 is used to increase the number of base rubber layers 2 or thermoplastic layers, and the increased number is at least one base rubber layer 7 or one thermoplastic layer, and the fault sections at the R-foot positions on the top sides of the two thermoplastic layers are connected between the inner base rubber layer 2 and the outer base rubber layer 2 via the base rubber layer.

[0030] At the same time, thermoplastic particles 3 are evenly distributed in the core mold body 1, and the thermoplastic particles 3 are evenly distributed between the outer matrix rubber layer 2 and the thermoplastic layer a 4 and between the thermoplastic layer b 5 and the inner matrix rubber layer 2; thermal resistance wires 6 are evenly laid between the two thermoplastic layers, and the thermal resistance wires 6 are evenly distributed in a wavy shape between the thermoplastic layer a 4 and the thermoplastic layer b 5.

[0031] A reinforcing layer 7 is provided in the bottom area of ​​the core mold body 1 to increase the rigidity of the bottom of the core mold body 1 to resist the laying pressure during the laying process; and the thermoplastic layer fault 8 in the top area of ​​the core mold body 1 is processed to avoid limiting the expansion and pressurization of the R-angle area.

[0032] In order to avoid the rapid cooling of the tooling and parts during the demoulding process, which causes the temperature of the thermoplastic core mold to drop and the rigidity to increase, and the inability to shrink it by vacuuming, or even more seriously, the parts to crack due to vacuuming, the utility model evenly arranges the thermal resistance wire 6 inside the core mold body 1, and continuously heats the core mold body 1 during the demoulding process of the core mold body 1 through the thermal resistance wire 6, so that the core mold body 1 remains in a softened state, so that it can shrink by vacuuming and demoulding smoothly.

[0033] In order to ensure that the thermal resistance wire 6 is not easily broken in the core mold body 1 due to the change in the stiffness of the core mold body 1, the utility model arranges the thermal resistance wire 6 between the two thermoplastic layers in a wave shape, so that the thermal resistance wire 6 has excess volume in the core mold body 1, so that it is not easy to be broken during the softening and expansion of the core mold body 1.

[0034] The Ω-shaped long-beam reinforced wall panel parts need to be cured and formed in the tooling 10. During the forming process, the core mold body 1 needs to be filled in the inner cavity of the long beam of the part. The core mold body 1 plays a role in both paving support and curing pressure transmission.

[0035] The memory core mold in the utility model is a hollow core mold compounded by a base rubber 2 (external base rubber layer 2, internal base rubber layer 2) and a thermoplastic reinforcement (thermoplastic layer a 4, thermoplastic layer b 5, thermoplastic particles 3). The base rubber layer 2 plays a sealing and temperature-resistant role, and the thermoplastic reinforcement has different strengths of rigidity at different temperatures, which can be used to adjust the rigidity of the core mold body 1 to adapt it to the rigidity requirements of the core mold at different stages of part molding.

[0036] For example, when laying at room temperature, since the thermoplastic reinforcement of the core mold body 1 has strong rigidity at low temperatures, it can resist the laying pressure of the automatic wire laying head without causing obvious deformation.

[0037] like Figure 4 As shown, during the curing process of the part, the high-temperature and high-pressure gas in the autoclave enters the inner cavity of the core mold body 1 through the gas nozzle interface 9. After the high-temperature gas pressure softens the core mold body 1, the pressure of the autoclave can be evenly transferred to the part through the core mold body 1.

[0038] like Figure 5 As shown, when the core mold body 1 is demoulded, the air nozzle interface 9 is connected to the vacuum joint, and the vacuum air source is connected to evacuate the inner cavity of the core mold body 1, so that the core mold body 1 undergoes a certain shrinkage deformation after vacuuming, so that the outer surface of the core mold body 1 is peeled off from the inner cavity of the long stringer, reducing the contact area with the inner cavity of the long stringer, making it easier to demould the core mold body 1.

[0039] In addition, in order to enable the memory core mold in the present invention to be reused many times, a shaping tool 15 for shaping the memory core mold is also developed. The shaping tool 15 is a mating mold structure, composed of an upper and a lower mold body. The inner cavity size of the shaping tool 15 is the theoretical outer size of the core mold body 1. Before shaping, a compressed air nozzle can be externally connected through the nozzle interface 9 of the core mold body 1, and a heating rod 16 is arranged in the shaping tool 15. The shaping tool 15 is heated by the heating rod 16. During the shaping process, the core mold body 1 softens under the heating of the heating rod 16, and the air source fills the inner cavity of the core mold body 1 through the nozzle interface 9. Under the action of temperature and pressure, the core mold body 1 expands and fits the inner cavity of the shaping tool 15 to restore to the theoretical size, so as to realize the repeated use of the memory core mold.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A memory core mold for co-curing molding of composite material Ω-shaped long-beam reinforced wall panels, characterized in that: The invention comprises a core mold body, which is a sealed hollow core mold, one end or both ends of the core mold body are provided with a gas nozzle interface, the core mold body comprises an inner matrix rubber layer, the outer surface of the inner matrix rubber layer is compositely connected with a thermoplastic layer b, the outer surface of the thermoplastic layer b is compositely connected with a thermoplastic layer a, the outer surface of the thermoplastic layer a is compositely connected with an outer matrix rubber layer, thermoplastic particles are evenly distributed in the core mold body, a thermal resistance wire is evenly laid between the two thermoplastic layers, a reinforcement layer is provided between the lower surface of the thermoplastic layer a and the outer matrix rubber layer, and a fault is provided at the R-foot position on the top side of the two thermoplastic layers.

2. The memory core mold for co-curing molding of composite material Ω-shaped long-string reinforced wall panels according to claim 1, characterized in that: The core mold body is composed of six surfaces: upper, lower, left, right, front and rear. The cross section of the core mold body is a trapezoidal structure, the lower surface is the large end of the trapezoid, and the four corners of the trapezoidal structure are R angle positions.

3. The memory core mold for co-curing molding of composite material Ω-shaped long-string reinforced wall panels according to claim 1, characterized in that: The thermal resistance wires are evenly distributed in a wave shape between the thermoplastic layer a and the thermoplastic layer b.

4. The memory core mold for co-curing molding of composite material Ω-shaped long-string reinforced wall panels according to claim 1, characterized in that: The reinforcement layer is to increase the number of base rubber layers or thermoplastic layers, and the increased number is at least one base rubber layer or one thermoplastic layer.

5. The memory core mold for co-curing molding of composite material Ω-shaped long-string reinforced wall panels according to claim 1, characterized in that: The thermoplastic particles are evenly distributed and dispersed between the outer matrix rubber layer and the thermoplastic layer a and between the thermoplastic layer b and the inner matrix rubber layer.

6. The memory core mold for co-curing and forming composite material Ω-shaped long-string reinforced wall panels according to claim 1, characterized in that: The fault sections at the R-leg positions on the top sides of the two thermoplastic layers are connected between the inner base rubber layer and the outer base rubber layer via the base rubber layer.

Images