Production mold for ellipsoidal shell made of composite material

Abstract

The utility model discloses a composite material ellipsoidal shell production mould in the technical field of moulds, which comprises a forming mould comprising an upper mould and a lower mould which are integrally circular, a mould cavity is formed on the inner surface after the upper mould and the lower mould are butted, and the section of the inner surface is arc-shaped; the mold is simple in structure, the surface smoothness of a product and the profile tolerance of the product can be guaranteed, after the mold is tried out, layer laying operation is easy, product demolding operation is easy, and the requirement for the dimensional accuracy of the product is effectively controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a composite shell forming mold. Background Art

[0002] Streamlined design concepts are widely used in aircraft, submarines, cars and ships. Streamlined design is often affected by factors such as product contour, appearance quality, internal quality and mechanical properties, which greatly restricts the application of composite materials. Composite parts obtained by autoclave method have excellent internal quality and appearance quality, and the mechanical properties can be adjusted by reinforcing fibers. Composite materials are subjected to high temperature and high pressure during the molding process and are prone to deformation. It is often necessary to control the deformation through mold compensation iterative design and layer design, which increases material costs and mold manufacturing costs.

[0003] The autoclave method is one of the commonly used processes for composite material molding. It is a method that uses high temperature and high pressure gas to act on the mold and prepreg at the same time, and solidifies the prepreg under a certain temperature and pressure. Usually, a positive mold or a negative mold is used to mold the product. Since the product is solidified at high temperature and demoulded at low temperature, and the expansion coefficient of the metal mold and the composite product is inconsistent, it is easy to have difficulty separating the product and the mold for products with complex shapes. At the same time, the ellipsoidal shell shape structure is also difficult to lay.

[0004] Therefore, how to design a composite material molding mold to ensure the surface finish, contour, thickness and other dimensional accuracy requirements of the molded product while ensuring smooth demoulding is a topic that technical personnel in this field need to study. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a composite material ellipsoidal shell production mold to solve the existing problems of inconvenient paving and difficult demoulding.

[0006] The purpose of the utility model is achieved as follows: a composite material ellipsoid shell production mold, comprising:

[0007] The molding die comprises an upper die and a lower die which are circular as a whole, wherein the inner surfaces of the upper die and the lower die form a mold cavity after being butted against each other, and the inner surface cross section is arc-shaped;

[0008] The preforming mold is C-shaped as a whole, and its outer surface follows the inner surfaces of the upper mold and the lower mold.

[0009] As a further limitation of the present invention, an upper flange is provided on the outer circumference of the upper mold, and a lower flange is provided on the outer circumference of the lower mold, and the upper flange and the lower flange are connected by bolts.

[0010] As a further limitation of the present invention, the lower flange is a right-angle structure.

[0011] As a further limitation of the present invention, a hollow design is adopted between the lower flange and the lower mold.

[0012] As a further limitation of the present utility model, an upper lifting lug is provided on the upper flange.

[0013] As a further limitation of the present utility model, a lower lifting ear is provided on the side of the lower flange.

[0014] As a further limitation of the present invention, the upper flange and the lower flange are further connected via a positioning pin.

[0015] As a further limitation of the present invention, a demoulding hole is provided on the upper flange.

[0016] As a further limitation of the present invention, the upper edge of the upper mold is provided with an upper top edge, and the lower edge of the lower mold is provided with a lower bottom edge.

[0017] As a further limitation of the present invention, the interior of the preforming mold is a hollow structure.

[0018] Compared with the prior art, the beneficial effects of the utility model are: the mold structure of the utility model is simple, and the surface finish and contour tolerance of the product can be guaranteed. After trial use, the mold is easy to operate, the product demoulding is easy to operate, and the product dimensional accuracy requirements are effectively controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the structure of the utility model.

[0021] Figure 2 It is a schematic diagram of the molding die structure in the utility model.

[0022] Figure 3 It is a schematic diagram of the structure of the preforming mold in the utility model.

[0023] Figure 4 It is a schematic diagram of the lower mold structure of the utility model.

[0024] Figure 5 It is a cross-sectional view of the forming mold in the utility model.

[0025] Figure 6 The figure is a schematic diagram of the shell structure made by using the utility model.

[0026] Among them, 100 is a forming mold, 101 is an upper mold, 101a is a demoulding hole, 101b is an upper flange, 101c is an upper top edge, 102 is a lower mold, 102a is hollowed out, 102b is a reinforcing rib, 102c is a lower flange, 102d is a lower bottom edge, 103 is a bolt, 104 is an upper lifting ear, 105 is a lower lifting ear, 106 is a mold cavity, 107 is a positioning pin, and 200 is a preforming mold. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0028] like Figure 1-5 A composite material ellipsoid shell production mold shown, comprising:

[0029] The molding die 100 includes an upper die 101 and a lower die 102 which are circular in shape as a whole. When the upper die 101 and the lower die 102 are butt-jointed, the inner surfaces form a die cavity 106, and the inner surface cross-section is arc-shaped. The upper edge of the upper die 101 is provided with an upper top edge 101c, and the lower edge of the lower die 102 is provided with a lower bottom edge 102d. Both the upper top edge 101c and the lower bottom edge are planes.

[0030] The preforming mold 200 is in a C-shape as a whole, and its outer surface follows the inner surfaces of the upper mold 101 and the lower mold 102 .

[0031] Specifically, the upper mold 101 and the lower mold 102 are both circular in shape, and 45# steel (HRC26-30) is used for processing. The butt joint surface between the upper mold 101 and the lower mold 102 is a plane, and the inner surface is an arc surface with a smooth transition. The preforming mold 200 is processed from hard aluminum, and usually the outer diameter of the preforming mold 200 corresponds to the inner diameter of the product.

[0032] The working principle of the utility model is:

[0033] First, the prepreg is laid on the outer surface of the preforming mold 200, and after the prepreg is preformed, it is removed from the preforming mold 200 and continued to be laid in the forming mold 100, and then a curing process is used to obtain the Figure 6 The ellipsoidal shell shown.

[0034] Furthermore, an upper flange 101 b is provided on the outer periphery of the upper mold 101 , and a lower flange 102 c is provided on the outer periphery of the lower mold 102 . The upper flange 101 b and the lower flange 102 c are connected by bolts 103 .

[0035] Specifically, in the assembled manner, the upper flange 101b and the lower flange 102c are butt-jointed together.

[0036] Such a design facilitates the assembly between the upper mold 101 and the lower mold 102 .

[0037] Furthermore, the lower flange 102c is a right-angle structure.

[0038] It should be noted that the lower flange 102c of the right-angle structure can provide a planar support to prevent the vacuum bag from breaking when the prepreg is cured.

[0039] Furthermore, a hollow 102a design is adopted between the lower flange 102c and the lower mold 102.

[0040] Specifically, a plurality of reinforcing ribs 102b are provided in the hollow space 102a.

[0041] The design of the hollowing 102 a can reduce the weight of the lower mold 102 , and the design of the reinforcing ribs 102 b can ensure the overall strength of the lower mold 102 .

[0042] Furthermore, an upper lifting lug 104 is provided on the upper flange 101b.

[0043] Specifically, four upper lifting ears 104 are provided, which facilitates the lifting of the upper mold 101 .

[0044] Furthermore, a lower lifting ear 105 is provided on the side of the lower flange 102c.

[0045] Specifically, four lower lifting ears 105 are also provided, which also facilitates the lifting of the lower mold 102.

[0046] Furthermore, the upper flange 101b and the lower flange 102c are connected via a positioning pin 107.

[0047] Specifically, matching positioning holes are provided on the upper flange 101b and the lower flange 102c.

[0048] The design of the positioning pin 107 facilitates the assembly of the upper die 101 and the lower die 102 , and the positioning pin 107 is used for positioning and the bolts 103 are used for fixing and assembling.

[0049] Furthermore, a demoulding hole 101a is provided on the upper flange 101b.

[0050] The design of demoulding hole 101a facilitates demoulding.

[0051] Furthermore, the interior of the preforming mold 200 is a hollow structure.

[0052] Specifically, the preforming mold 200 is a shell structure, which can further save materials.

[0053] The mold structure of this embodiment adopts negative mold forming, which can achieve the outer surface and external dimensions of the product, especially the requirement of contour degree 0.05. The mold structure is simple and can ensure the smoothness of the outer surface of the product and the tolerance of the product contour degree. After trial, the mold is easy to operate, the product demoulding is easy to operate, and the product dimensional accuracy requirements are effectively controlled.

[0054] The above embodiments are only used to help understand the method and core idea of ​​the utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made to the utility model without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A composite material ellipsoidal shell production mold, characterized in that: include: The molding die (100) comprises an upper die (101) and a lower die (102) which are both circular in shape. When the upper die (101) and the lower die (102) are butt-jointed, the inner surfaces of the upper die (101) and the lower die (102) form a mold cavity (106), and the inner surface cross-section is arc-shaped. The preforming mold (200) is in a C-shape as a whole, and its outer surface follows the inner surfaces of the upper mold (101) and the lower mold (102).

2. A composite material ellipsoidal shell production mold according to claim 1, characterized in that: An upper flange (101b) is provided on the outer circumference of the upper die (101), and a lower flange (102c) is provided on the outer circumference of the lower die (102); the upper flange (101b) and the lower flange (102c) are connected via bolts (103).

3. A composite material ellipsoidal shell production mold according to claim 2, characterized in that: The lower flange (102c) is a right-angle structure.

4. A composite material ellipsoidal shell production mold according to claim 2, characterized in that: A hollow (102a) design is adopted between the lower flange (102c) and the lower mold (102).

5. A composite material ellipsoidal shell production mold according to claim 2, characterized in that: An upper lifting lug (104) is provided on the upper flange (101b).

6. A composite material ellipsoidal shell production mold according to claim 2, characterized in that: A lower lifting ear (105) is provided on the side of the lower flange (102c).

7. A composite material ellipsoidal shell production mold according to claim 2, characterized in that: The upper flange (101b) and the lower flange (102c) are also connected via a positioning pin (107).

8. The composite material ellipsoidal shell production mold according to claim 2, characterized in that: The upper flange (101b) is provided with a demoulding hole (101a).

9. A composite material ellipsoidal shell production mold according to any one of claims 1 to 7, characterized in that: An upper top edge (101c) is provided at the upper edge of the upper mold (101), and a lower bottom edge (102d) is provided at the lower edge of the lower mold (102).

10. A composite material ellipsoidal shell production mold according to any one of claims 1 to 7, characterized in that: The interior of the preforming mold (200) is a hollow structure.

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