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

Abstract

The invention provides a frame type three-dimensional structure composite material forming mold, and belongs to the field of mold design and manufacturing. And a series of problems of high integral forming difficulty, multiple internal defects and the like of the longitudinal beam reinforced composite cabin are solved. The core mold, the flange plate, the inner split part, the outer split part, the upper flange, the lower flange and the outer pressurizing frame part are designed, the form and position precision of the mold is guaranteed through positioning, limiting and connecting screws of all the parts, and the purpose of integrated forming of a product is achieved. The method is mainly used for integrally forming the frame type three-dimensional structure composite cabin. By means of the frame type three-dimensional structure composite material forming mold, frame type composite material integral forming can be achieved, and the continuity of fibers is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of composite material manufacturing technology, and in particular relates to a frame-type three-dimensional composite material molding die and its molding method, specifically a longitudinal beam-reinforced frame-type three-dimensional composite material cabin molding die. Background Art

[0002] Composite materials, characterized by low density, high strength, and high modulus, are widely used in aviation, aerospace, and weaponry. Existing product structures cannot simultaneously meet the performance requirements of lightweight, high rigidity, high precision, and high strength. The longitudinally beam-reinforced frame-type three-dimensional composite material cabin structure can resolve the contradiction between these three requirements. Summary of the Invention

[0003] In view of this, in order to solve a series of problems such as the difficulty of integral molding of longitudinal beam-reinforced composite material cabins and the presence of many internal defects, this invention proposes a frame-type three-dimensional composite material molding die and its molding method. The die is designed with a core mold, flange, inner segment, outer segment, upper flange, lower flange, and outer pressure frame components. The positioning, limiting, and connecting screws of each component ensure the shape and position accuracy of the die, thereby achieving the goal of integral molding of the product.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a frame-type three-dimensional composite material molding die, comprising a core mold, a flange, several inner segments, several outer segments, an upper flange, a lower flange, and an outer pressure frame. The core mold is a hollow cylinder. A flange is installed at the lower end of the core mold, an upper flange is installed at the upper end of the core mold, and a lower flange is installed at the lower end of the flange. The several inner segments and several outer segments form a ring. The annular inner segment structure is fitted around the outer periphery of the core mold. The outer periphery of the annular inner segment structure is the product, and the outer periphery of the product is the annular outer segment structure. An outer pressure frame is fitted around the outer periphery of the outer segment structure.

[0005] Furthermore, the flange is annular with a boss structure. The protruding structure on the flange is embedded in the lower end of the core mold. The flange is provided with connection holes, positioning holes and set screw holes for connecting with the core mold.

[0006] Furthermore, the inner side of the inner segment is the core mold contact surface, and the outer side is the product contact surface. The inner side of the inner segment and the core mold contact surface are guaranteed to have a gapless surface contact and are connected by positioning pins and bolts.

[0007] Furthermore, the inner side of the outer segment structure is the product contact surface, and the outer side is the mold pressing surface, with the outer side of the outer segment being the mold pressing surface.

[0008] Furthermore, the outer sides of the upper and lower flanges are limiting surfaces for the outer segments.

[0009] Furthermore, the inner and outer lobes are configured with eight segments.

[0010] Compared with the prior art, the beneficial effects of the frame-type three-dimensional composite material molding die and its molding method described in this invention are:

[0011] 1. This frame-type three-dimensional composite material molding die enables the one-piece molding of frame-type composite materials, ensuring the continuity of fibers.

[0012] 2. This invention enables the production of reinforced and outward-facing flange products using simple molds.

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

[0014] 4. In the process of composite material molding, the present invention applies pressure through bolts on the external pressure frame. The vibration generated by the bolts acting on the outer segments can expel air bubbles inside the composite material, ensuring low porosity inside the product and improving the internal quality of the product. Attached Figure Description

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

[0016] Figure 1 This is an overall structural diagram of the frame-type three-dimensional composite material molding die described in this invention;

[0017] Figure 2 This is a perspective view of the frame-type three-dimensional composite material molding die of the present invention;

[0018] Figure 3 This is a schematic diagram of the core mold described in this invention;

[0019] Figure 4 This is a schematic diagram of the flange structure described in this invention;

[0020] Figure 5 This is a schematic diagram of the internally segmented structure described in this invention;

[0021] Figure 6 This is a schematic diagram of the external lobe structure described in this invention;

[0022] Figure 7 This is a schematic diagram of the upper flange described in this invention;

[0023] Figure 8 This is a schematic diagram of the lower flange described in this invention;

[0024] Figure 9This is a schematic diagram of the external pressure frame described in this invention;

[0025] In the diagram: 1-core mold, 2-flange, 3-inner segment, 4-outer segment, 5-upper flange, 6-lower flange, 7-outer pressure frame. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0027] See Figure 1-9 This embodiment describes a frame-type three-dimensional composite material molding die, comprising a core mold 1, a flange 2, an inner segment 3, an outer segment 4, an upper flange 5, a lower flange 6, and an outer pressure frame 7. The core mold 1 is fitted around the outer periphery of the frame-type three-dimensional composite material.

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

[0029] The flange 2 has a boss structure. The protruding structure on the flange 2 is embedded in the lower end of the core mold 1. The flange 2 is provided with connection holes, positioning holes and set screw holes for connecting with the core mold 1.

[0030] The inner side of the inner segment 3 is the core mold contact surface, and the outer side is the product contact surface. The inner side of the inner segment 3 and the core mold contact surface are guaranteed to have a gapless surface contact and are connected by positioning pins and bolts. The outer side is guaranteed to have a smooth surface and a high profile.

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

[0032] The lower end face of the upper flange 5 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 segment 4. The upper end face of the lower flange 6 is in contact with the flange contact surface of the product and the flange 2, and the outer side is the limiting surface of the outer segment 4. The lower surface and outer side of the upper and lower flanges are guaranteed to be clean and have surface accuracy.

[0033] The external pressure frame 7 has 11 rows and 3 columns of 23 set screw holes arranged according to the positions of the 8 outer segments 4. The direction of the set screw holes is perpendicular to the surface of the external pressure frame 7.

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

[0035] The positioning holes and connecting holes on the lower end face of the core mold 1 are connected to the flange 2. The core mold 1 and the flange 2 are positioned by positioning pins through the positioning holes on the lower end face of the core mold 1 and the core mold 1 is connected and fixed through the threaded holes on the flange 2.

[0036] The positioning holes and connecting holes on the core mold 1 cylinder wall are connected to the upper flange 5. The positioning pins on the upper flange 5 and the core mold 1 cylinder wall are used for positioning. The upper flange 5 is connected and fixed to the core mold 1 cylinder wall through the threaded holes. Similarly, the positioning pins on the lower flange 6 and the core mold 1 cylinder wall are used for positioning. The lower flange 6 is connected and fixed to the core mold 1 cylinder wall through the threaded holes.

[0037] The positioning holes on the inner segment 3 and the outer segment 4 are positioned by positioning pins. The limiting platform on the inner segment 3 is in contact with the surface of the outer segment 4 to ensure the mold cavity between the inner segment 3 and the outer segment 4.

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

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

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

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

[0042] Step 3: Position the upper flange 5 and the lower flange 6 using locating pin holes and tighten them with bolt holes.

[0043] Step 4: After the mold is assembled, it is placed in a curing oven and heated to the heat-sealing temperature of the frame composite material. The mold is then heat-sealed in place and placed in the oven for curing.

[0044] Step 5: After the cured mold cools down, demold it smoothly by removing the outer pressure frame 7, outer segment 4, upper flange 5, lower flange 6, core mold 1, and inner segment 3.

[0045] The embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A frame-type three-dimensional structure composite material forming mold, characterized in that: 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); 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).

2. The frame-type three-dimensional structure composite material forming mold according to claim 1, characterized in that: The flange (2) is annular and presents 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 connected to the core mold (1).

3. 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 are in gap-free surface contact and are connected by positioning pins and bolts.

4. 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 pressurizing surface; the outer side of the outer petal (4) is a mold pressurizing surface.

5. The frame-type three-dimensional structure composite material forming mold according to claim 1, characterized in that: The outer sides of the upper flange (5) and the lower flange (6) are limiting surfaces of the outer petals (4).

6. 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).

7. The frame-type three-dimensional structure composite material forming mold according to claim 1, characterized in that: The inner petal (3) is connected by using the positioning holes and the connection 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 positioning pins through the positioning holes on the inner petal (3) and the cylinder wall of the core mold (1); and 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).

8. The frame-type three-dimensional structure composite material forming mold according to claim 1, characterized in that: The positioning holes and connecting holes on the lower end surface of the core mold (1) are connected to the flange (2), and positioning pins are used to position the lower end surface of the core mold (1) and the flange (2), and the flange (2) is connected and fixed to the core mold (1) through the threaded holes on the flange (2).

9. The frame-type three-dimensional structure composite material forming mold according to claim 1, characterized in that: The outer petals (4) are pressurized by bolts on an external pressure frame (7); the external pressure frame (7) is an integral hollow cylindrical structure, with bolts arranged around the cylinder wall.

10. A molding method using the frame-type three-dimensional structure composite material molding mold according to any one of claims 1 to 9, specifically comprising the following steps: Step 1: The inner petals (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 inner petals (3) and the core mold (1) are integrated; Step 2: Position the outer petal (4) and the core mold (1), install the outer pressure frame (7) to tighten and pressurize, and then lay the upper flange (5) and the lower flange (6); Step 3: Assemble the upper flange (5) and the lower flange (6) by positioning the positioning pin holes and tightening them with the bolt holes; 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; Step 5: After the solidified mold is cooled, it is demoulded. During demoulding, 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) are removed in sequence.

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