Frame type three-dimensional structure composite material forming die and forming method thereof

Abstract

The application provides a frame type three-dimensional structure composite material forming die and belongs to the field of die design and manufacturing. The application solves a series of problems such as difficulty in integrally forming a longitudinal beam reinforced composite material cabin body, and many internal defects. The application designs a core die, a flange plate, an inner segment, an outer segment, an upper flange, a lower flange and an outer pressure frame component, and guarantees the shape and position accuracy of the die through positioning, limiting and connecting screws of the components, so as to realize the integrally forming purpose of the product. The application is mainly used for integrally forming a frame type three-dimensional structure composite material cabin body. Through the frame type three-dimensional structure composite material forming die, the frame type composite material can be integrally formed, and the continuity of the fiber is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite material manufacturing, and in particular relates to a frame-type three-dimensional structure composite material forming mold and a forming method thereof, specifically a longitudinal beam reinforced frame-type three-dimensional structure composite material cabin forming mold. Background Art

[0002] Composite materials, characterized by low density, high strength, and high modulus, are widely used in aviation, aerospace, and weapon systems. Existing product structures cannot simultaneously meet the performance requirements of light weight, high rigidity, high precision, and high strength. A composite cabin with a three-dimensional structure reinforced by longitudinal beams and a frame structure can address these challenges. Summary of the Invention

[0003] In view of this, in order to solve a series of difficult problems such as the difficulty in integral molding of longitudinal beam reinforced composite cabin and the many internal defects, the present invention proposes a frame-type three-dimensional structure composite material molding mold and a molding method thereof, and designs a core mold, a flange plate, an inner petal, an outer petal, an upper flange, a lower flange, and an external pressure frame component. The positioning, limiting, and connecting screws of each component are used to ensure the shape and position accuracy of the mold and achieve the purpose of integrated molding of the product.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a frame-type three-dimensional structure composite material forming mold, including a core mold, a flange plate, several inner petals, several outer petals, an upper flange, a lower flange and an external pressure frame, the core mold is a hollow cylinder, the lower end of the core mold is equipped with a flange plate, the upper end of the core mold is equipped with an upper flange, and the lower end of the flange plate is equipped with a lower flange, the several inner petals and the several outer petals form a circular ring, the annular inner petal structure is sleeved on the outer periphery of the core mold, the outer periphery of the annular inner petal structure is the product, the outer periphery of the product is the annular outer petal structure, and the outer periphery of the outer petal structure is sleeved with an external pressure frame.

[0005] Furthermore, the flange is annular and presents a boss structure. The raised structure on the flange is embedded in the lower end of the core mold. The flange is provided with a connecting hole, a positioning hole and a top screw hole connected to the core mold.

[0006] Furthermore, the inner side of the inner petal is the core mold contact surface, and the outer side is the product contact surface. The inner side of the inner petal and the core mold contact surface ensure gap-free surface contact and are connected using positioning pins and bolts.

[0007] Furthermore, the inner side of the outer petal overall structure is the product contact surface, and the outer side is the mold pressure surface, and the outer side of the outer petal is the mold pressure surface.

[0008] Furthermore, the outer sides of the upper flange and the lower flange are limiting surfaces of the outer petals.

[0009] Furthermore, there are eight inner petals and eight outer petals.

[0010] Compared with the prior art, the frame-type three-dimensional structure composite material forming mold and forming method described in the present invention have the following beneficial effects:

[0011] 1. The frame-type three-dimensional structure composite material forming mold can realize the one-piece forming of the frame-type composite material and ensure the continuity of the fiber.

[0012] 2. The present invention can realize the production of externally reinforced and outward-turned flange products by using a simple mold.

[0013] 3. The present invention controls the mold cavity by limiting the upper flange and the lower flange.

[0014] 4. In the present invention, during the composite material molding process, pressure is applied by bolts on the external pressure frame. The vibration generated by the bolts acting on the outer petals can drive out the bubbles inside the composite material, ensuring low porosity inside the product and improving the internal quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 This is the overall structural diagram of the frame-type three-dimensional structure composite material forming mold of the present invention;

[0017] Figure 2 A three-dimensional diagram of the frame-type three-dimensional structure composite material forming mold of the present invention;

[0018] Figure 3 Schematic diagram of the structure of the core mold of the present invention;

[0019] Figure 4 This is a schematic structural diagram of the flange according to the present invention;

[0020] Figure 5 This is a schematic diagram of the structure of the inner petal according to the present invention;

[0021] Figure 6 This is a schematic structural diagram of the outer petal structure of the present invention;

[0022] Figure 7 This is a schematic structural diagram of the upper flange of the present invention;

[0023] Figure 8 This is a schematic structural diagram of the lower flange of the present invention;

[0024] Figure 9This is a structural diagram of the external pressure frame of the present invention;

[0025] In the figure: 1- core mold, 2- flange, 3- inner petal, 4- outer petal, 5- upper flange, 6- lower flange, 7- outer pressure frame. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features therein can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0027] See also Figures 1-9 This embodiment describes a frame-type three-dimensional structure composite material forming mold, comprising a core mold 1, a flange 2, an inner petal 3, an outer petal 4, an upper flange 5, a lower flange 6 and an external pressure frame 7. The outer periphery of the frame-type three-dimensional structure composite material is covered with the core mold 1.

[0028] The core mold 1 is a hollow cylinder with positioning holes and connecting holes on the upper and lower end planes and the cylindrical surface of the hollow cylinder. The inner petals 3 are positioned by positioning pins through the positioning holes on the cylinder wall, and the inner petals 3 are fixed by bolts through the connecting holes on the cylinder wall.

[0029] The flange 2 is a boss structure as a whole. The raised structure on the flange 2 is embedded in the lower end of the core mold 1. The flange 2 is provided with a connecting hole connected to the core mold 1, a positioning hole and a top screw hole.

[0030] The inner side of the inner petal 3 is the core mold contact surface, and the outer side is the product contact surface. The inner side of the inner petal 3 and the core mold contact surface ensure seamless surface contact and are connected with positioning pins and bolts. The outer side ensures surface smoothness and profile accuracy.

[0031] The inner side of the outer petal 4 is the product contact surface, and the outer side is the mold pressure surface. The inner side of the outer petal 3 ensures surface smoothness and profile accuracy, and the outer side is the mold pressure surface to ensure the hardness of the mold surface.

[0032] The lower end face of the upper flange 5 as a whole is in contact with the flange contact surface of the product and the core mold 1, and the outer side is the limiting surface of the outer petal 4. The upper end face of the lower flange 6 as a whole is in contact with the flange contact surface of the product and the flange plate 2, and the outer side is the limiting surface of the outer petal 4. The lower surfaces and outer sides of the upper and lower flanges are guaranteed to be clean and have surface accuracy.

[0033] 23 top screw holes are arranged in 11 rows and 3 columns on the external pressure frame 7 according to the positions of the 8 external petals 4, and the directions of the top screw holes are perpendicular to the surface of the external pressure frame 7.

[0034] The present invention utilizes the positioning holes and connecting holes on the cylinder wall of the core mold 1 to connect the inner petal 3. There are threaded holes and positioning holes on the inner petal 3. Positioning pins are used through the positioning holes on the inner petal 3 and the cylinder wall of the core mold 1 to position the two. The inner petal 3 is connected and fixed to the cylinder wall of the core mold 1 through the threaded holes on the inner petal 3.

[0035] The positioning holes and connecting holes on the lower end surface of the core mold 1 are connected to the flange 2. The positioning pins are used to position the lower end surface of the core mold 1 and the flange 2 through the positioning holes, and the flange 2 is connected and fixed to the core mold 1 through the threaded holes on the flange 2.

[0036] The core mold 1 is connected to the upper flange 5 by the positioning holes and the connecting holes on the upper flange 5 and the core mold 1. The upper flange 5 and the core mold 1 are positioned by positioning pins through the positioning holes on the upper flange 5. The upper flange 5 is fixed to the core mold 1 through the threaded holes on the upper flange 5. The lower flange 6 and the core mold 1 are positioned by positioning pins through the positioning holes on the core mold 1. The lower flange 6 is fixed to the core mold 1 through the threaded holes on the lower flange 6.

[0037] The positioning holes on the inner petal 3 and the positioning holes on the outer petal 4 are positioned using positioning pins, and the limit platform on the inner petal 3 contacts the surface of the outer petal 4 to ensure the mold cavity between the inner petal 3 and the outer petal 4.

[0038] The outer petals 4 are pressurized by bolts on the outer pressure frame 7. The outer pressure frame 7 is an integral hollow cylindrical structure with bolts arranged around the cylinder wall.

[0039] The molding method of the frame-type three-dimensional structure composite material molding die of the present invention specifically comprises the following steps:

[0040] Step 1: The inner petal 3 and the core mold 1 are positioned by positioning pin holes and fastened by bolt holes to form an integrated structure, and the product is laid and formed on the structure after the petal 3 and the core mold 1 are integrated.

[0041] Step 2: Position the outer petal 4 and the core mold 1, install the external pressure frame 7 to tighten and pressurize, and then lay the upper flange 5 and the lower flange 6.

[0042] Step 3: Assemble the upper flange 5 and the lower flange 6 by using the positioning pin holes to position them and the bolt holes to tighten them.

[0043] Step 4: After the overall mold is closed, the mold is placed in a curing furnace to be heated to the heat-sealing temperature of the frame-type composite material, the mold is heat-sealed in place, and then placed in the furnace for curing.

[0044] Step 5: After the solidified mold cools down, it is demoulded. The demoulding is carried out smoothly by removing the external pressure frame 7, the outer petal 4, the upper flange 5, the lower flange 6, the core mold 1, and the inner petal 3.

[0045] The embodiments of the present invention disclosed above are intended only to illustrate the present invention. The embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A frame-type three-dimensional structure composite material forming mold, characterized by: The invention comprises a core mold (1), a flange (2), a plurality of inner petals (3), a plurality of outer petals (4), an upper flange (5), a lower flange (6) and an external pressure frame (7), wherein the core mold (1) is a hollow cylinder, the lower end of the core mold (1) is provided with a flange (2), the upper end of the core mold (1) is provided with an upper flange (5), the lower end of the flange (2) is provided with a lower flange (6), the plurality of inner petals (3) and the plurality of outer petals (4) form a circular ring, the annular inner petal structure is sleeved on the outer periphery of the core mold (1), the outer periphery of the annular inner petal structure is the product, the outer periphery of the product is the annular outer petal structure, and the outer periphery of the outer petal structure is sleeved with an external pressure frame (7); The flange (2) is annular and has a boss structure. The convex structure on the flange (2) is embedded in the lower end of the core mold (1). The flange (2) is provided with a connection hole, a positioning hole and a top screw hole for connecting with the core mold (1); The outer sides of the upper flange (5) and the lower flange (6) are limiting surfaces of the outer petals (4); The inner petal (3) is connected by using the positioning holes and the connecting holes on the cylinder wall of the core mold (1). The inner petal (3) has a threaded hole and a positioning hole. The inner petal (3) and the cylinder wall of the core mold (1) are positioned by using a positioning pin through the positioning holes on the inner petal (3) and the cylinder wall of the core mold (1). The inner petal (3) is connected and fixed to the cylinder wall of the core mold (1) through the threaded hole on the inner petal (3); The positioning holes and the connecting holes on the lower end surface of the core mold (1) are connected to the flange (2), and the positioning holes on the lower end surface of the core mold (1) and the flange (2) are used to position the two, and the flange (2) is connected and fixed to the core mold (1) through the threaded holes on the flange (2); The core mold (1) is connected to the upper flange (5) through the positioning holes and the connecting holes on the core mold (1) using positioning pins to position the upper flange (5) and the core mold (1) wall. The upper flange (5) is connected and fixed to the core mold (1) wall through the threaded holes on the upper flange (5). The lower flange (6) and the core mold (1) wall are positioned using positioning pins to position the lower flange (6) and the core mold (1) wall. The lower flange (6) is connected and fixed to the core mold (1) wall. The positioning holes on the inner petal (3) and the positioning holes on the outer petal (4) are positioned using positioning pins, and the limiting platform on the inner petal (3) contacts the surface of the outer petal (4) to ensure the mold cavity between the inner petal (3) and the outer petal (4); The outer petals (4) are pressurized by bolts on an outer pressure frame (7). The outer pressure frame (7) is an integral hollow cylindrical structure with bolts arranged around the cylinder wall.

2. The frame-type three-dimensional structure composite material forming mold according to claim 1, characterized in that: The inner side of the inner petal (3) is the core mold contact surface, and the outer side is the product contact surface. The inner side of the inner petal (3) and the core mold contact surface ensure gap-free surface contact and are connected using positioning pins and bolts.

3. The frame-type three-dimensional structure composite material forming mold according to claim 1, characterized in that: The inner side of the overall structure of the outer petal (4) is a product contact surface, and the outer side is a mold pressure surface.

4. The frame-type three-dimensional structure composite material forming mold according to claim 1, characterized in that: There are eight inner petals (3) and eight outer petals (4).

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