A method for forming a split barrel segment composite tooling

Abstract

The application discloses a forming method of a split cylinder segment composite material tool, which comprises the following steps: metal negative die forming tool preparation; composite material tool laying preparation; composite material tool laying; and composite material tool demolding. In the forming method of the split cylinder segment composite material tool, isolation materials are laid in advance to realize splitting, and then pre-impregnated materials are directly laid, so that the profile quality of a hyperboloid cylinder segment part in the later stage can be guaranteed, demolding is facilitated, the thermal expansion coefficient of the split cylinder segment composite material tool matches the thermal expansion coefficient of a required formed part, the size precision of the formed composite material part is high, and the profile requirement of the composite material part can be easily met. The forming method of the split cylinder segment composite material tool is suitable for manufacturing and demolding production of other composite material parts with complex profiles.

Description

Technical Field

[0001] This invention belongs to the field of composite material tooling molding technology, specifically relating to a molding method for a segmented cylindrical composite material tooling. Background Technology

[0002] With the widespread application of composite materials in the aerospace field, some structural parts with complex curved surfaces such as cylindrical and hyperbolic shapes are also gradually adopting composite materials. This puts forward higher requirements for the molding process of composite materials. Composite material molding requires the use of corresponding tooling. For composite material parts with cylindrical and complex curved surfaces, metal tooling is difficult to manufacture and the surface of the molded composite material is prone to exceeding tolerance.

[0003] Currently, composite tooling is gradually being used to form composite parts with complex curved surfaces. However, the special curved surface structure increases the difficulty of demolding the parts. Therefore, it is necessary to develop a molding tooling that is easy to manufacture and easy to demold the parts. To this end, we propose a molding method for a segmented cylindrical composite tooling. Summary of the Invention

[0004] The purpose of this invention is to provide a molding method for segmented cylindrical composite material tooling to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for molding a segmented cylindrical composite material tooling, comprising the following steps:

[0006] A. Preparation of metal female mold forming fixture:

[0007] Obtain the inner surface data of the composite material part digital model, and prepare the metal female mold forming tooling based on the inner surface data of the composite material part digital model;

[0008] B. Preparation for composite material tooling installation:

[0009] Cut the isolation material according to the dimensions of the metal female mold forming fixture, and mark the segmented area and the reinforcement area on the metal female mold forming fixture;

[0010] C. Composite material tooling installation:

[0011] The cut isolation material is pre-laid on the marked segmented and reinforcing areas on the metal female mold forming tooling. Then the prepreg is cut and laid on the segmented areas. After the overall laying is completed, the encapsulation component is used for encapsulation and curing to obtain the cured composite material tooling.

[0012] D. Demolding of composite material tooling:

[0013] After the composite material tooling has cured, remove the connecting bolts on the metal female mold forming tooling, and peel the cured composite material tooling from the metal female mold forming tooling in sections to demold. The demolding of the composite material tooling is completed, and the segmented cylindrical composite material tooling is obtained.

[0014] Preferably, the metal female mold forming fixture is a detachable metal female mold forming fixture connected by connecting bolts.

[0015] Preferably, the length of the isolation material is greater than the height of the metal female mold forming fixture, the isolation material is laid along the height of the cylindrical section of the metal female mold forming fixture, and the isolation material is a material containing polytetrafluoroethylene.

[0016] Preferably, in step C, when laying the composite material tooling: except for the composite material in the middle layer, when laying each layer of composite material, the isolation material is flipped to the other side and fixed with pressure-sensitive tape;

[0017] When laying the composite material in the intermediate layer, the release material and the prepreg are laid together.

[0018] Preferably, in the segmented area marked on the metal female mold forming fixture, the cross-section of the isolation material has a trapezoidal structure.

[0019] Preferably, the packaging component is an isolation film, a breathable material, or a vacuum bag.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The molding method of the segmented cylindrical composite material tooling of the present invention adopts the pre-laying of isolation material to achieve segmentation in the molding process of segmented cylindrical composite material tooling, and then the prepreg is directly laid, which can ensure the surface quality of the hyperbolic cylindrical part in the later stage, and facilitate demolding and use. The thermal expansion coefficient of the segmented cylindrical composite material tooling matches the thermal expansion coefficient of the required molded part. The molded composite material part has high dimensional accuracy and can easily meet the curved surface requirements of the composite material part. The molding method of the segmented cylindrical composite material tooling is applicable to the manufacturing and demolding production of composite material parts with other complex curved surfaces.

[0022] 2. Furthermore, the segmented cylindrical composite material tooling of this invention has high ease of installation and molding, can integrally mold composite material parts, is easy to reuse, and reduces the manufacturing cost of composite material parts. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the integral molding of the segmented cylindrical composite material tooling of the present invention;

[0024] Figure 2 This is a schematic diagram of the cross-section of the segmented cylindrical composite material tooling of the present invention.

[0025] In the diagram: 1. Metal female mold forming fixture; 2. Segmented cylindrical composite material fixture; 3. Isolation material; 4. Connecting bolts; 5. Prepreg. 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. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figures 1-2 The molding method for the segmented cylindrical composite material tooling provided by the present invention includes the following steps:

[0028] A. Preparation of metal female mold forming fixture:

[0029] Obtain the inner surface data of the composite material part digital model, and prepare the metal female mold forming fixture 1 based on the inner surface data of the composite material part digital model;

[0030] Metal female mold forming fixture 1 is a detachable metal female mold forming fixture connected by connecting bolts;

[0031] B. Preparation for composite material tooling installation:

[0032] Cut the isolation material according to the dimensions of the metal female mold forming fixture. The length of the isolation material is greater than the height of the metal female mold forming fixture. The isolation material is laid along the height of the cylindrical section of the metal female mold forming fixture. The isolation material is a material containing polytetrafluoroethylene.

[0033] And mark the segmented area and the reinforced area on the metal female mold forming fixture;

[0034] C. Composite material tooling installation:

[0035] The cut isolation material 3 is pre-attached to the marked segmented area and reinforcement area on the metal female mold forming tooling 1. Then the prepreg 5 is cut and attached to the segmented area. After the overall attachment is completed, the tooling is sealed and cured using an isolation film, breathable material or vacuum bag to obtain the cured composite material tooling.

[0036] In step C, when laying the composite material tooling: except for the middle layer of composite material, when laying each layer of composite material, flip the release material 3 to the other side and fix it with pressure-sensitive tape;

[0037] When laying the composite material of the intermediate layer, the release material 3 and the prepreg 5 are laid together;

[0038] Within the segmented area marked on the metal female mold forming fixture 1, the cross-section of the isolation material has a trapezoidal structure;

[0039] D. Demolding of composite material tooling:

[0040] After the composite material tooling has cured, remove the connecting bolts 4 on the metal female mold forming tooling 1, and peel the cured composite material tooling from the metal female mold forming tooling 1 into segments for demolding. The demolding of the composite material tooling is completed, and the segmented cylindrical composite material tooling 2 is obtained.

[0041] The molding method of the segmented cylindrical composite material tooling of the present invention adopts the pre-laying of isolation material to achieve segmentation during the molding process of the segmented cylindrical composite material tooling 2, and then the prepreg is directly laid, which can ensure the surface quality of the hyperbolic cylindrical part in the later stage, and facilitate demolding and use. The thermal expansion coefficient of the segmented cylindrical composite material tooling 2 matches the thermal expansion coefficient of the part to be molded. The molded composite material part has high dimensional accuracy and can easily meet the curved surface requirements of the composite material part. The molding method of the segmented cylindrical composite material tooling is applicable to the manufacturing and demolding production of composite material parts with other complex curved surfaces.

[0042] Furthermore, the segmented cylindrical composite material tooling 2 of this invention has high ease of laying and molding, can integrally mold composite material parts, is easy to reuse, and reduces the manufacturing cost of composite material parts.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for molding a segmented cylindrical composite material tooling, characterized in that, Includes the following steps: A. Preparation of metal female mold forming fixture: Obtain the inner surface data of the composite material part digital model, and prepare the metal female mold forming tooling based on the inner surface data of the composite material part digital model; B. Preparation for composite material tooling installation: Cut the isolation material according to the dimensions of the metal female mold forming fixture, and mark the segmented area and the reinforcement area on the metal female mold forming fixture; C. Composite material tooling installation: The cut isolation material is pre-laid on the marked segmented and reinforcing areas on the metal female mold forming tooling. Then the prepreg is cut and laid on the segmented areas. After the overall laying is completed, the encapsulation component is used for encapsulation and curing to obtain the cured composite material tooling. D. Demolding of composite material tooling: After the composite material tooling has cured, remove the connecting bolts on the metal female mold forming tooling, peel the cured composite material tooling from the metal female mold forming tooling in sections, and demold the composite material tooling. The demolding of the composite material tooling is completed, and the segmented cylindrical composite material tooling is obtained. The metal female mold forming fixture is a detachable metal female mold forming fixture connected by connecting bolts; In step C, when laying the composite material tooling: except for the middle layer of composite material, when laying each layer of composite material, the release material is flipped to the other side and fixed with pressure-sensitive tape; When laying the composite material in the intermediate layer, the release material and the prepreg are laid together; Within the segmented area marked on the metal female mold forming fixture, the cross-section of the isolation material has a trapezoidal structure.

2. The molding method of a segmented cylindrical composite material tooling according to claim 1, characterized in that: The length of the isolation material is greater than the height of the metal female mold forming fixture. The isolation material is laid along the height of the cylindrical section of the metal female mold forming fixture. The isolation material is a material containing polytetrafluoroethylene.

3. The molding method of a segmented cylindrical composite material tooling according to claim 1, characterized in that: The packaging component is an isolation film, a breathable material, or a vacuum bag.

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