Composite material skin wallboard forming mold with metal cover plate

Abstract

The utility model discloses a composite material skin wallboard forming die with a metal cover plate, which comprises a bent die template and a bent metal cover plate, the curvature of the metal cover plate is the same as that of the die template, a skin wallboard is placed between the metal cover plate and the die template, the metal cover plate is a bent frame with a hollow middle, and the metal cover plate is a bent frame with a hollow middle. The outer sides of the edges of four frames of the metal cover plate are connected with the mold template through positioning assemblies, the lower surfaces of the inner sides of the edges of the four frames of the metal cover plate are connected to the edges of the skin wall plate in a pressed mode, the edges of the skin wall plate do not interfere with the positioning assemblies, and a plurality of single-point heating devices are arranged in the four frames of the metal cover plate. According to the utility model, the problems of overlarge buckling deformation of the edge of the large-size composite material skin wallboard and overlarge tolerance during assembly caused by the overlarge buckling deformation can be reduced, and the running safety of an airplane is improved.

Description

Technical Field

[0001] This utility model relates to the field of molding die technology for skin panels, and in particular to a molding die for a composite material skin panel with a metal cover plate. Background Technology

[0002] Carbon fiber reinforced composites are widely used in aerospace components due to their lightweight, high specific strength, and high design flexibility. Especially in the manufacture of large aircraft fuselages, advanced foreign aircraft manufacturers such as Airbus and Boeing have achieved the application of all composite materials. However, during the autoclave curing process of carbon fiber reinforced composites, factors such as the mismatch in thermal expansion coefficients between the fiber and the resin matrix, curing shrinkage, and mold shearing effects lead to curing deformation after demolding. This phenomenon is affected by size effects and is more pronounced in the molding of large aircraft fuselage skin panels. Calculations and measurements have revealed that the deformation of large-sized composite skin panels exhibits a characteristic of smaller deformation in the middle and larger deformation at the edges. This is because the bottom of the skin is affected by the adhesive effect of the mold during the molding process, causing stress concentration at the edges. This edge warping deformation can lead to excessive tolerances when assembling different composite skin panels, and more seriously, it can affect aircraft flight safety. Utility Model Content

[0003] The purpose of this utility model is to solve the technical problems existing in the prior art and to provide a molding die for a composite material skin panel with a metal cover plate.

[0004] To achieve the above objectives, the technical solution provided by this utility model is: a composite material skin panel molding mold with a metal cover plate, comprising a curved mold plate and a curved metal cover plate, wherein the curvature of the metal cover plate is the same as that of the mold plate, a skin panel is placed between the metal cover plate and the mold plate, the metal cover plate is a curved frame with a hollow center, the outer edges of the four sides of the metal cover plate are connected to the mold plate through positioning components, the lower surfaces of the inner sides of the four sides of the metal cover plate are pressed onto the edges of the skin panel, and the edges of the skin panel do not interfere with the positioning components, and multiple single-point heating devices are provided inside the four sides of the metal cover plate.

[0005] Preferably, the positioning component includes a positioning bolt, and a plurality of threaded holes are provided on the outer edge of the metal cover plate. The threaded holes are arranged at equal intervals, and a plurality of corresponding mating screw holes are provided on the mold plate. The positioning bolt passes through the threaded holes on the metal cover plate and connects with the mating screw holes on the mold plate.

[0006] Preferably, the spacing of the positioning bolts is 100-400mm.

[0007] Preferably, the number of single-point heating devices is 6 to 10. The single-point heating device is a resistance wire set in the four sides of the metal cover plate, and the four sides of the metal cover plate are provided with power supply interfaces for supplying power to the resistance wire, and the power supply interfaces are connected to an external power source.

[0008] Preferably, the metal cover is a curved frame with four edges integrally formed or a curved frame with four edges spliced ​​together.

[0009] Preferably, the width of the metal cover plate is 50-300mm and the thickness of the metal cover plate is 5-15mm.

[0010] The beneficial effects of this utility model are:

[0011] In this invention, the shearing action between the metal cover plate and the edge area of ​​the skin panel will offset part of the shearing action of the mold on the skin panel, reducing the stress asymmetry in the thickness direction.

[0012] The single-point heating device for the metal cover plate in this utility model can adjust the deformation trend of the skin wall plate by controlling the temperature gradient in the thickness direction of the skin wall plate.

[0013] In this invention, the positioning bolts are fastened to the mold plate. The pressure applied by the positioning bolts to the metal cover plate can increase the interlayer bonding strength at the edge of the skin panel and reduce internal stress. Furthermore, the metal cover plate of this invention only applies pressure to the edge area of ​​the skin panel and does not affect the reinforcing rib structure designed in the middle of the skin panel.

[0014] In summary, this invention can reduce excessive warping deformation at the edges of large-size composite material skin panels and the resulting excessive tolerance during assembly, thereby improving aircraft safety. Attached Figure Description

[0015] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0016] Figure 1 This is a schematic diagram of the mold plate and skin panel structure of this utility model;

[0017] Figure 2 This is a schematic diagram showing the connection between the mold plate, the skin panel, and the metal cover plate of this utility model;

[0018] Figure 3 This is a schematic diagram of the overall metal cover plate of this utility model;

[0019] Figure 4 This is a schematic diagram of the single-point heating device inside the metal cover plate of this utility model.

[0020] Attached image captions:

[0021] 1-Mold plate, 2-Skin panel, 3-Metal cover plate, 4-Positioning component, 5-Single-point heating device, 6-Threaded hole. Detailed Implementation

[0022] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0023] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0025] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0026] Reference Figures 1-4 In a preferred embodiment of the present invention, a composite material skin panel molding die with a metal cover plate includes a curved mold plate 1 and a curved metal cover plate 3. The width of the metal cover plate 3 is 50-300mm and the thickness is 5-15mm. The curvature of the metal cover plate 3 is the same as that of the mold plate 1. A skin panel 2 is placed between the metal cover plate 3 and the mold plate 1. The metal cover plate 3 is a curved frame with a hollow center. The outer edges of the four sides of the metal cover plate 3 are connected to the mold plate 1 through positioning components 4.

[0027] Furthermore, the lower surfaces of the inner sides of the four edges of the metal cover plate 3 are pressed onto the edges of the skin panel 2. In this invention, the shearing action between the metal cover plate 3 and the edge area of ​​the skin panel 2 will offset part of the shearing action of the mold on the skin panel 2, reducing the stress asymmetry in the thickness direction; and the edges of the skin panel 2 do not interfere with the positioning components.

[0028] In this embodiment, the positioning component 4 includes positioning bolts. A plurality of threaded holes 6 are provided on the outer edge of the metal cover plate 3. The threaded holes 6 are arranged at equal intervals. Further, the interval between the positioning bolts is 100-400mm. A plurality of corresponding mating screw holes are provided on the mold plate 1. The positioning bolts pass through the threaded holes 6 on the metal cover plate 3 and connect with the mating screw holes on the mold plate 1.

[0029] Specifically, in this utility model, the positioning bolts are fastened to the mold plate 1. The pressure applied by the positioning bolts to the metal cover plate 3 can increase the interlayer bonding strength at the edge of the skin panel 2 and reduce the internal stress. Moreover, the metal cover plate 3 of this utility model only applies pressure to the edge area of ​​the skin panel and does not affect the reinforcing rib structure designed in the middle of the skin panel 2.

[0030] In this embodiment, multiple single-point heating devices 5 are provided inside the four sides of the metal cover plate 3; the number of single-point heating devices 5 is 6 to 10. The single-point heating device 5 is a resistance wire set inside the four sides of the metal cover plate 3, and a power supply interface for supplying power to the resistance wire is opened on the four sides of the metal cover plate 3. The power supply interface is connected to an external power source.

[0031] Specifically, the single-point heating device 5 of the metal cover plate 3 in this utility model can adjust the deformation trend of the skin wall plate 2 by controlling the temperature gradient in the thickness direction of the skin wall plate 2.

[0032] In this embodiment, the metal cover plate 3 is a curved frame integrally formed by four side borders or the metal cover plate is a curved frame spliced ​​together by four side borders.

[0033] Example 1

[0034] A molding die for a composite material skin panel with a metal cover plate includes a curved die plate 1 and a curved metal cover plate 3. The die plate 1 has dimensions of 992×700mm and a curvature of 5×10. -3 The metal cover plate 3 is 10mm thick and 100mm wide, the positioning bolts are spaced 200mm apart, and there are 6 single-point heating devices 5.

[0035] This invention can reduce excessive warping deformation at the edges of large-size composite material skin panels 2 and the resulting excessive tolerance during assembly, thereby improving aircraft flight safety.

[0036] Without causing conflict, those skilled in the art can freely combine and use the above-mentioned additional technical features.

[0037] The above description is only a preferred embodiment of the present utility model. Any technical solution that achieves the purpose of the present utility model by essentially the same means shall fall within the protection scope of the present utility model.

Claims

1. A composite skin panel forming tool with a metal cover plate, characterized by: The metal cover plate is a hollow curved frame, the edges of the four frames of the metal cover plate are connected with the mold plate through positioning assemblies, the lower surface of the inner side of the edges of the four frames of the metal cover plate is pressed on the edges of the skin wall plate, and the edges of the skin wall plate do not interfere with the positioning assemblies, and a plurality of single-point heating devices are arranged in the four frames of the metal cover plate.

2. The composite skin panel forming tooling with metal cover plate of claim 1, wherein: The positioning assembly comprises a positioning bolt, a plurality of threaded holes are formed on the outer side of the edges of the metal cover plate, the threaded holes are equidistantly arranged, a plurality of corresponding matching screw holes are arranged on the mold plate, and the positioning bolt is connected with the matching screw holes on the mold plate through the threaded holes on the metal cover plate.

3. A composite skin panel forming tool with a metal cover plate as defined in claim 2, characterized in that: The interval of the positioning bolt is 100-400 mm.

4. The composite skin panel forming tooling with metal cover plate of claim 1, wherein: The number of the single-point heating devices is 6-10, the single-point heating device is a resistance wire arranged in the four frames of the metal cover plate, and the side surface of the four frames of the metal cover plate is provided with a power supply interface for supplying power to the resistance wire, and the power supply interface is connected with an external power supply.

5. The composite skin panel forming tool with metal cover plate of Claim 1, wherein: The metal cover plate is a curved frame integrally formed with the four frames or the metal cover plate is a curved frame spliced by the four frames.

6. The composite skin panel forming tool with metal cover plate of Claim 1, wherein: The width of the metal cover plate is 50-300 mm, and the thickness of the metal cover plate is 5-15 mm.

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