A three-dimensional weaving method for irregularly shaped components with pointed ends.

Abstract

This invention provides a three-dimensional weaving method for irregularly shaped components with sharp corners at the ends, belonging to the field of three-dimensional weaving, and is used to solve the technical problems of poor weaving quality and inability to demold after molding of irregularly shaped components with sharp corners in the prior art. The steps are as follows: S1: Prepare a core mold part of water-soluble material, and connect a first guide and a second guide to both ends of the core mold part to obtain a core mold assembly; S2: Install the core mold assembly on the core mold fixing frame on one side of the three-dimensional weaving machine for three-dimensional weaving, and use vacuum injection molding to shape the woven irregularly shaped component; S3: Cut the shaped irregularly shaped component and both ends of the core mold assembly; S4: Demold the cut core mold product and guide scrap parts by water-soluble and demolding fixtures respectively. This application improves the quality of the ends of the woven product by connecting the first and second guides with rounded corners at both ends of the core mold part, and reduces the difficulty of product demolding by setting the core mold part in the middle as a water-soluble core mold.

Description

Technical Field

[0001] This invention belongs to the field of three-dimensional weaving, and in particular relates to a three-dimensional weaving method for irregularly shaped components with sharp corners at the ends. Background Technology

[0002] Three-dimensional braided composites are a type of textile structural composite material. Compared to laminated composites, the greatest advantage of textile structural composites lies in the fact that by increasing the fiber bundles or yarns in the thickness direction, the load-bearing capacity and other properties in that direction are significantly enhanced, thus improving the overall structural stability. Because the reinforcing fibers are distributed in multiple directions in three-dimensional space, the propagation of interlaminar cracks under impact loads is prevented or slowed, greatly improving the interlaminar properties of three-dimensional braided composites. Therefore, three-dimensional braided composites have higher impact damage tolerance and fracture toughness than ordinary laminated composites; compared to ordinary plywood products, they are lighter in weight while maintaining the same performance. This characteristic makes three-dimensional braiding have broader application prospects in the aerospace field.

[0003] For composite materials with simple external shapes, weaving can be done directly, and the weaving effect can be directly molded and demolded. However, large, irregularly shaped components, especially structural components with irregular shapes such as wings and tail fins, often have sharp corners and internal reinforcement designs, such as reinforcing plates and rods. Such structural components may have the following problems: ① poor weaving effect; ② components with internal reinforcement structures may not be able to be demolded after molding, which makes it impossible to guarantee the weight of the product after molding, thus greatly affecting the application of 3D weaving in the aerospace field; especially shapes with sharp corners at the ends, it is difficult to hold the yarn, which can easily break the preform, making the woven preform not only have poor overall integrity, but most importantly, the product performance does not meet the requirements. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a three-dimensional weaving method for irregularly shaped components with sharp corners at the ends, in order to solve the technical problem in the prior art that the weaving quality of irregularly shaped components with sharp corners at the ends is poor and that they cannot be demolded after molding.

[0005] To achieve the above and other related objectives, the present invention provides a three-dimensional weaving method for irregularly shaped components with sharp corners at the ends, the specific steps of which are as follows:

[0006] S1: Core fabrication: Prepare a core mold made of water-soluble material, and connect a first guide and a second guide to both ends of the core mold to obtain a core mold assembly;

[0007] S2: Three-dimensional weaving: The core mold assembly obtained in step S1 is installed on the core mold fixing frame on one side of the three-dimensional weaving machine for three-dimensional weaving, and the woven irregular component is shaped by vacuum injection molding.

[0008] S3: Product cutting: Cut the two ends of the irregular component and core mold assembly after shaping in step S2 to obtain the middle core mold product and the guide waste parts at both ends;

[0009] S4: Product demolding: The water-soluble material of the core mold part is dissolved by water to obtain the irregular component. The guide waste parts at both ends are demolded by demolding tooling to obtain the first guide part and the second guide part respectively.

[0010] As an optional solution, in step S1, positioning pins are provided at both ends of the core module, and a special-shaped component support frame is provided in the middle of the core module.

[0011] One end of the first guide member and the second guide member are provided with a positioning pin hole, and the end face of the other end of the first guide member and the second guide member are provided with a guide bevel.

[0012] As an optional solution, the specific steps for mold core fabrication in step S1 are as follows:

[0013] S1.1: Embed the irregular component support frame and positioning pin into the core mold forming mold, and pour water-soluble material to obtain the core mold;

[0014] S1.2: Insert the positioning pins at both ends of the core mold into the positioning pin holes of the first guide and the second guide respectively, and connect the core mold to the first guide and the second guide by bonding.

[0015] As an optional option, the length of the core mold in step S1 is greater than the length of the irregular component product to be fabricated.

[0016] As an optional option, in step S1, both the first guide and the second guide are made of lightweight wood.

[0017] As an optional solution, in step S3, the length of the cut core mold product is greater than the length of the irregular component, and the length of the cut core mold product is less than the length of the core mold component.

[0018] As an optional solution, the specific method for dissolving the water-soluble material of the core mold part in step S4 is as follows:

[0019] Place the core mold product into the melting chamber, add dissolving water, and after the core mold is completely melted, remove the woven irregular component and collect the water-dissolved core mold material.

[0020] As an optional solution, the specific method for demolding the guide scrap parts at both ends using demolding fixtures in step S4 is as follows:

[0021] The guide waste component is installed on the demolding fixture to demold the waste. Then, the water-soluble core mold parts at both ends of the first guide component and the second guide component are dissolved by water to obtain the first guide component and the second guide component respectively.

[0022] As described above, the three-dimensional weaving method for irregularly shaped components with pointed ends according to the present invention has at least the following beneficial effects:

[0023] This application improves the quality of the ends of the woven product by connecting the first and second guides with rounded corners at both ends of the core mold, and reduces the difficulty of product demolding by setting the core mold in the middle as a water-soluble core mold. Furthermore, the dissolved water-soluble material and the first and second guides at both ends can be reused, thereby reducing the cost of woven molding. Attached Figure Description

[0024] Figure 1 The diagram shown is a flowchart of the three-dimensional compilation method of the present invention.

[0025] Figure 2 The diagram shown is a structural schematic of the core mold assembly of the present invention.

[0026] Figure 3 The diagram shown is a structural schematic of the core module of the present invention.

[0027] Figure 4 The diagram shown is a structural schematic of the first guide member of the present invention.

[0028] Figure 5 The diagram shown is a structural schematic of the support frame of the present invention.

[0029] In the diagram: 1-Core module; 2-First guide component; 3-Second guide component; 4-Guide fillet; 5-Positioning pin; 6-Positioning pin hole; 7-Support frame. Detailed Implementation

[0030] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0031] Please see Figures 1 to 5It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0032] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.

[0033] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This invention provides a three-dimensional weaving method for irregularly shaped components with sharp corners at the ends, characterized by the following specific steps:

[0034] S1: Core fabrication: Prepare a core mold 1 made of water-soluble material, and connect the first guide 2 and the second guide 3 to both ends of the core mold 1 to obtain the core mold assembly;

[0035] S2: Three-dimensional weaving: The core mold assembly obtained in step S1 is installed on the core mold fixing frame on one side of the three-dimensional weaving machine for three-dimensional weaving, and the woven irregular component is shaped by vacuum injection molding.

[0036] S3: Product cutting: Cut the two ends of the irregular component and core mold assembly after shaping in step S2 to obtain the middle core mold product and the guide waste parts at both ends;

[0037] S4: Product demolding: The water-soluble material of the core mold part 1 is dissolved by water to obtain the irregular component. The guide waste parts at both ends are demolded by demolding tooling to obtain the first guide part 2 and the second guide part 3 respectively.

[0038] In the embodiment of the invention, the core mold 1 of the general is a formal mold (which needs to be appropriately lengthened to allow for repair). The first guide 2 and the second guide 3, which are arc-shaped at both ends, are spliced ​​together with the core mold 1 in the middle part for weaving. This is equivalent to blunting the four corners into rounded corners that are conducive to weaving. The shape most suitable for this three-dimensional weaving machine to weave is a circle, and the overall weaving angle is uniform.

[0039] In the embodiments of the invention, vacuum injection molding (VARI) is used to shape the woven irregular components. The resulting parts have fewer injection defects and the texture remains unchanged, making it easier to control and ensure product quality.

[0040] Please see Figure 2 , Figure 3 Figure 4 and Figure 5 In step S1, both ends of the core module 1 are provided with positioning pins 5, and the core module 1 is provided with a special-shaped component support frame 7 in the middle.

[0041] One end of the first guide member 2 and the second guide member 3 is provided with a positioning pin hole 6, and the end face of the other end of the first guide member 2 and the second guide member 3 is provided with a guide bevel.

[0042] Please see Figure 1 The specific steps for making the mold core in step S1 are as follows:

[0043] S1.1: Embed the irregular component support frame 7 and positioning pin 5 into the core mold 1 forming mold, and pour water-soluble material to obtain the core mold 1;

[0044] S1.2: Insert the positioning pins 5 at both ends of the core mold 1 into the positioning pin holes 6 of the first guide 2 and the second guide 3 respectively, and connect the core mold 1 to the first guide 2 and the second guide 3 by adhesive bonding.

[0045] In one embodiment of the present invention, the length of the core mold 1 in step S1 is greater than the length of the irregular component product to be fabricated.

[0046] In this invention, lengthening the middle core mold 1 facilitates subsequent cutting and product repair.

[0047] In one embodiment of the present invention, the first guide member 2 and the second guide member 3 in step S1 are both made of lightweight wood.

[0048] In this invention, the first guide member 2 and the second guide member 3 at both ends are made of lightweight materials such as wood substitutes, which can reduce the weight of the overall core mold and save costs.

[0049] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 In step S3, the length of the cut core mold product is greater than the length of the irregular component, and the length of the cut core mold product is less than the length of the core mold 1.

[0050] In this invention, the length of the cut core mold product is greater than the length of the irregular component to facilitate post-processing such as repair and polishing of the product. The length of the cut core mold product is less than the length of the core mold 1 to ensure the integrity of the first guide 2 and the second guide 3, and to facilitate the reuse of the first guide 2 and the second guide 3.

[0051] As an embodiment of the present invention, the specific method for dissolving the water-soluble material core mold 1 of the core mold product by water dissolution in step S4 is as follows:

[0052] Place the core mold product into the melting chamber, add dissolving water, and after the core mold part 1 has completely melted, take out the woven irregular component and collect the water-dissolved core mold material.

[0053] The specific method for demolding the guide scrap parts at both ends using the demolding fixture in step S4 is as follows:

[0054] The guide waste parts are installed on the demolding fixture to demold the waste. Then, the water-soluble core mold parts at both ends of the first guide 2 and the second guide 3 are dissolved by water to obtain the first guide 2 and the second guide 3 respectively.

[0055] In this embodiment, the cost of 3D modeling and waste disposal is reduced by collecting the water-soluble core mold material, the first guide 2, and the second guide 3.

[0056] In summary, the present invention improves the quality of the ends of the woven product by connecting the first and second guide members 3 with rounded corners at both ends of the core mold 1, sets the core mold 1 in the middle as a water-soluble core mold to reduce the difficulty of product demolding, and the dissolved water-soluble material as well as the first guide members 2 and the second guide members 3 at both ends can be reused, thereby reducing the cost of woven molding.

[0057] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A three-dimensional weaving method for irregularly shaped components with pointed ends, characterized in that, The specific steps are as follows: S1: Core fabrication: Prepare a core mold made of water-soluble material, and connect a first guide and a second guide to both ends of the core mold to obtain a core mold assembly; S2: Three-dimensional weaving: The core mold assembly obtained in step S1 is installed on the core mold fixing frame on one side of the three-dimensional weaving machine for three-dimensional weaving, and the woven irregular component is shaped by vacuum injection molding. S3: Product cutting: Cut the two ends of the irregular component and core mold assembly after shaping in step S2 to obtain the middle core mold product and the guide waste parts at both ends; S4: Product demolding: The water-soluble material of the core mold part is dissolved by water to obtain the irregular component. The guide waste parts at both ends are demolded by demolding tooling to obtain the first guide part and the second guide part respectively. In step S1, positioning pins are provided at both ends of the core module, and a special-shaped component support frame is provided in the middle of the core module; One end of the first guide member and the second guide member are provided with a positioning pin hole, and the end face of the other end of the first guide member and the second guide member are provided with a guide bevel.

2. The three-dimensional weaving method for irregularly shaped components with pointed ends as described in claim 1, characterized in that, The specific steps for making the mold core in step S1 are as follows: S1.1: Embed the irregular component support frame and positioning pin into the core mold forming mold, and pour water-soluble material to obtain the core mold; S1.2: Insert the positioning pins at both ends of the core mold into the positioning pin holes of the first guide and the second guide respectively, and connect the core mold to the first guide and the second guide by bonding.

3. The three-dimensional weaving method for an irregularly shaped component with sharp corners at the ends as described in claim 1, characterized in that, The length of the core mold in step S1 is greater than the length of the irregular component product to be fabricated.

4. The three-dimensional weaving method for an irregularly shaped component with sharp corners at the ends as described in claim 1, characterized in that, In step S1, both the first guide and the second guide are made of lightweight wood.

5. A three-dimensional weaving method for an irregularly shaped component with a pointed end as described in claim 1, characterized in that, In step S3, the length of the cut core mold product is greater than the length of the irregular component, and the length of the cut core mold product is less than the length of the core mold component.

6. A three-dimensional weaving method for an irregularly shaped component with sharp corners at the ends, as described in claim 1, characterized in that... The specific method for dissolving the water-soluble material of the core mold part in step S4 is as follows: Place the core mold product into the melting chamber, add dissolving water, and after the core mold is completely melted, remove the woven irregular component and collect the water-dissolved core mold material.

7. A three-dimensional weaving method for an irregularly shaped component with a pointed end as described in claim 6, characterized in that, The specific method for demolding the guide scrap parts at both ends using the demolding fixture in step S4 is as follows: The guide waste component is installed on the demolding fixture to demold the waste. Then, the water-soluble core mold parts at both ends of the first guide component and the second guide component are dissolved by water to obtain the first guide component and the second guide component respectively.

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