A forming die for annular composite material four-way joint

Abstract

The utility model provides a molding die for an annular composite material four-way joint, comprising an outer mold component and a core mold component, wherein the outer mold component is composed of upper and lower positioning plates, an end piece, an outer mold piece and a center circle piece, and the core mold component is composed of an L-shaped core mold, an I-shaped core mold and an R-shaped core mold, and the upper and lower positioning plates, the end piece, the outer mold piece and the center circle piece are positioned and connected by positioning pins, wherein an annular composite material four-way joint can be molded, the annular joint is integrally molded, and the gluing assembly link of the split structure is avoided, and the molding cycle can be significantly shortened; the mold is easy to disassemble and assemble, and the reset accuracy is high, and the mold can be reused many times; the annular four-way joint is integrally molded, and the strength of the product is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aerospace composite material processing, in particular to a forming die for an annular composite material four-way joint. Background Art

[0002] Composite frame structure is a common structure of satellite structure. As a spacecraft structure, frame structure can effectively reduce the weight of the system. At the same time, frame structure is a high-order hyperstatic structure, with the ability to withstand multi-directional forces, good stiffness and overall performance, and can effectively withstand concentrated loads and various dynamic loads. These excellent properties of frame structure make frame structure the fastest growing form of space structure.

[0003] The frame structure generally includes composite material joints and composite material rods. The forms of composite material joints are various. Conventional joints can be formed by a molding process. For example, the annular composite material four-way joint involved in the utility model, if formed in one piece by a molding process, the metal core mold cannot be demolded, so the four-way joint needs to be split into multiple joint parts, which are bonded into a four-way joint by gluing after molding. This method forms annular composite material four-way joints, and it is necessary to separately design and manufacture molding molds for multiple joints and positioning tooling for bonding. There are disadvantages such as many types of tooling molds, long molding cycle, and low overall strength of the product, which cannot meet the design requirements. Therefore, improvements are needed to the existing problems. Utility Model Content

[0004] In view of the above situation, in order to overcome the current technical defects, the utility model provides a mold for molding an annular composite material four-way joint.

[0005] The technical scheme adopted by the utility model is as follows: the annular composite material four-way joint forming mold proposed in this scheme includes an outer mold component and a core mold component, the outer mold component includes upper and lower positioning plates, an end block, an outer mold block, and a center circle block, the core mold component includes an L-shaped core mold, an I-shaped core mold and an R-shaped core mold, the upper and lower positioning plates are composed of an upper positioning plate and a lower positioning plate, and the upper and lower positioning plates are provided with countersunk positioning holes for connecting the end block, the outer mold block and the center circle block; the end block is composed of The outer mold block is composed of several blocks, and the outer mold block is provided with a threaded hole connecting the upper and lower positioning plates; the center circle block is composed of several blocks, and the center circle block is provided with a threaded hole connecting the upper and lower positioning plates; the L-shaped core mold is composed of several blocks, and several R-shaped core molds are arranged on the inner side of the L-shaped core mold, and the L-shaped core mold, I-shaped core mold and R-shaped core mold are connected by adhesive.

[0006] Furthermore, the L-shaped core mold, the I-shaped core mold and the R-shaped core mold are all made of expandable materials and are cured and formed through an oven process.

[0007] In a preferred embodiment of the utility model, the upper and lower positioning plates are positioned and connected with the end blocks, the outer mold blocks and the center circle blocks through positioning screws, countersunk pin holes and threaded holes.

[0008] In a preferred embodiment of the utility model, the outer dimensions of the L-shaped core mold, the I-shaped core mold and the R-shaped core mold are provided with a certain process gap, and the size of the process gap is determined according to the thermal expansion parameters of R10301 silicone rubber.

[0009] In a preferred embodiment of the present invention, the corner positions of the L-shaped core mold, the I-shaped core mold and the R-shaped core mold are sharp angles.

[0010] In a preferred embodiment of the utility model, the outer mold component is made of P20 mold steel, and the core mold component is made of R10301 silicone rubber material.

[0011] The beneficial effects achieved by the utility model using the above structure are as follows: the annular composite material four-way joint forming mold proposed in this scheme has the following advantages: the utility model only needs to use one set of molds to form an annular composite material four-way joint; the annular composite material four-way joint in the utility model is formed in one piece, reducing the process flow of multiple joints being formed separately and glued and assembled due to conventional processes, thereby shortening the molding cycle; the mold of the utility model is easy to disassemble and assemble, has high resetting accuracy, and the mold can be reused many times; the product of the utility model is formed in one piece, and the product strength is higher than the method of forming them separately and then gluing them together. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0013] Figure 1 This is a schematic diagram of the overall structure of the annular composite material four-way joint forming mold of this scheme;

[0014] Figure 2 This is a schematic diagram of the outer mold component of the annular composite material four-way joint forming mold of this scheme;

[0015] Figure 3 This is a schematic diagram of the core mold assembly of the annular composite material four-way joint molding mold of this scheme.

[0016] Among them, 100, outer mold assembly, 200, core mold assembly, 110, upper and lower positioning plates, 120, end blocks, 130, outer mold blocks, 140, center circle blocks, 210, L-shaped core mold, 220, I-shaped core mold, 230, R-shaped core mold. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0018] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0019] like Figure 1 , Figure 2 and Figure 3 As shown, the technical scheme adopted by the utility model is as follows: the annular composite material four-way joint forming mold proposed in this scheme includes an outer mold component 100 and a core mold component 200, the outer mold component 100 is composed of an upper and lower positioning plates 110, an end block 120, an outer mold block 130 and a center circle block 140, the core mold component is composed of an L-shaped core mold 210, an I-shaped core mold 220 and an R-shaped core mold 230, the L-shaped core mold 210, the I-shaped core mold 220 and the R-shaped core mold 230 are all integrally cured and formed through an oven process, the upper and lower positioning plates 110 are positioned and connected with the end block 120, the outer mold block 130 and the center circle block 140 through positioning screws and countersunk pin holes, and the assembly accuracy of the lower positioning plate 110, the end block 120, the outer mold block 130 and the center circle block 140 can be guaranteed through the positioning screws and countersunk pin holes, thereby ensuring the external dimensions of the annular composite material four-way joint.

[0020] As title 1, Figure 2 and Figure 3 As shown, the L-shaped core mold 210, the I-shaped core mold 220, and the R-shaped core mold 230 are bonded and positioned as one body by adhesive, and the outline size is consistent with the inner cavity size of the annular composite material four-way joint minus the process gap. The core mold corner position is a sharp angle, which can improve the accuracy of the core mold thermal expansion pressure. Prepreg is laid on the outside of the core mold assembly. After the laying is completed, the core mold assembly and the prepreg are placed in the cavity composed of the outer mold assembly and locked with positioning screws. The annular composite material four-way joint is formed by heating in an oven and applying pressure to the core mold by thermal expansion.

[0021] Among them, the annular composite material four-way joint is made of high-strength and high-modulus carbon fiber prepreg, with an annular structure in the middle and four tenons in the four extreme directions. The whole is an annular hollow structure.

[0022] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, material or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, material or apparatus.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A forming die for an annular composite material cross-joint, characterized in that: It includes an outer mold assembly and a core mold assembly, the outer mold assembly includes upper and lower positioning plates, an end piece, an outer mold piece, and a center circle piece, the core mold assembly includes an L-shaped core mold, an I-shaped core mold and an R-shaped core mold, the upper and lower positioning plates are composed of an upper positioning plate and a lower positioning plate, and the upper and lower positioning plates are provided with countersunk positioning holes for connecting the end piece, the outer mold piece and the center circle piece; the end piece is composed of a plurality of pieces, and the end piece is provided with a groove for connecting the L-shaped core mold and the I-shaped core mold; the outer mold piece is composed of a plurality of pieces, and the outer mold piece is provided with a threaded hole connecting the upper and lower positioning plates; the center circle piece is composed of a plurality of pieces, and the center circle piece is provided with a threaded hole connecting the upper and lower positioning plates; the L-shaped core mold is composed of a plurality of pieces, and a plurality of R-shaped core molds are provided on the inner side of the L-shaped core mold, and the L-shaped core mold, the I-shaped core mold and the R-shaped core mold are connected by adhesive.

2. The annular composite material four-way joint forming mold according to claim 1, characterized in that: The L-shaped core mold, the I-shaped core mold and the R-shaped core mold are all made of expandable materials.

3. The annular composite material four-way joint forming mold according to claim 2, characterized in that: The upper and lower positioning plates are positioned and connected with the end piece, the outer mold piece and the center circle piece through positioning screws, countersunk pin holes and threaded holes.

4. The annular composite material four-way joint forming mold according to claim 3, characterized in that: The outer dimensions of the L-shaped core mold, the I-shaped core mold and the R-shaped core mold are provided with a certain process gap.

5. The annular composite material four-way joint forming mold according to claim 4, characterized in that: The corner positions of the L-shaped core mold, the I-shaped core mold and the R-shaped core mold are sharp angles.

6. The annular composite material four-way joint forming mold according to claim 5, characterized in that: The outer mold assembly is made of P20 mold steel, and the core mold assembly is made of R10301 silicone rubber material.

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