A braided needle-punched preform composite forming method

Abstract

The present application relates to the field of fiber reinforced composite preform manufacturing, in particular to a kind of braiding needle punching preform composite forming method.The steps of the present application are as follows: firstly, according to the material use condition, determine the parameters of needle punching layer, braiding layer and braiding hollow structure needle punching layer and its related process scheme, then prepare braiding hollow structure fabric, fill cloth felt mixed layer in hollow support structure and carry out needle punching, after hollow structure cloth, felt needle punching is completed, needle punching layer forming is carried out on the surface of braiding structure. Finally realize the composite forming of braiding needle punching preform. The braiding needle punching preform composite forming method proposed in the present application can realize the transition connection of needle punching structure and braiding structure, obtain better interface connection effect and stronger interlaminar bonding capacity, and can improve the interlaminar damage situation under the service condition of multi-structure integrated composite material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite material preform manufacturing, in particular to a braided needle-punched preform composite forming method BACKGROUND

[0002] With the development of large aircraft, heavy-load rockets, heavy-load trains and other front-line major equipment, material structure lightweight directly determines the advancement of the equipment, and composite materials, as an important material for lightweight equipment, have attracted widespread attention. In recent years, three-dimensional structure composite materials have developed rapidly because they have broken through the problem of poor interlayer performance of traditional two-dimensional composite materials.

[0003] In the use process of aerospace ordnance equipment, key components often face complex service conditions, which puts forward the demand for multifunctional integration of core materials and the forming requirement for multi-structure integration of composite material manufacturing technology. At present, single-structure composite materials have single function, and multi-structure composite materials have weak interface connection between structures, which cannot meet the application demand of multifunctional integrated composite materials. In terms of multi-structure composite material forming method, the related technology for forming different structures has low composite degree, and the gradient of direct transition between different structures is obvious, and there is a lack of related technical means to improve the structure transition of multi-structure integrated composite materials, therefore, the present application provides a braided needle-punched preform composite forming method. SUMMARY

[0004] The present application mainly provides a braided needle-punched preform composite forming method, which mainly solves the problems of obvious gradient between multi-structures, poor interface combination and interlayer damage of multi-structure integrated preform.

[0005] To achieve the above-mentioned purpose, according to one aspect of the present application, a braided needle-punched preform composite forming method is provided, and the specific steps are as follows:

[0006] 1. According to the demand of composite material use condition, set the parameters of needle-punched layer (1), braided layer and braided hollow structure needle-punched layer (3).

[0007] 2. According to the parameters of braided layer, determine the structure of surface layer (2), hollow support layer (4) and bottom layer (5) and the corresponding braiding process scheme.

[0008] 3. Form the braided hollow structure fabric according to the braiding process

[0009] 4. According to the parameters of needle-punched layer (1) and hollow structure needle-punched layer (3), determine the parameters of cloth and felt material and ratio, and the parameters of cloth and felt mixed filling material and ratio in the hollow structure.

[0010] 5. Fill the cloth and felt mixed layer into the hollow support layer (4) of the braided hollow structure fabric.

[0011] (6) The woven hollow structure fabric filled with the mixed layer of cloth and felt is needled from the structure of the surface layer (2) to the hollow structure needled layer (3).

[0012] (7) After the needling of the cloth and felt in the hollow structure is completed, the fiber cloth and fiber felt are laid on the surface layer (2) of the hollow structure fabric to continue needling and forming until the thickness of the needled layer (1) is reached, and a needled woven-needled composite structure preform is formed.

[0013] Further, the woven layer includes but is not limited to the use of three-dimensional weaving, three-dimensional weaving, three-dimensional knitting and other processes to realize the forming of the hollow support layer.

[0014] Further, the bottom layer (5), the hollow support layer (4) and the surface layer (2) can be combined in different proportions.

[0015] Further, the cloth and felt material filled in the hollow structure can be different from the needled layer.

[0016] Further, the needling process parameters such as the needling density and the needling depth of the cloth and felt filled in the hollow structure can be different from the needling process parameters of the needled layer.

[0017] The beneficial effects of the present application are:

[0018] The present application can realize the integrated forming of the mixed layer of cloth and felt and the hollow structure fabric, improve the interface connection effect of the two structures, realize the transition connection of the needled structure-woven structure on the surface layer by laying and needling, obtain better interface connection effect and stronger interlayer bonding capacity, and can improve the interlayer damage under the service condition of the multi-structure integrated composite material. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The present application is a woven needled preform composite forming method

[0020] Figure 2 The present application is a woven needled preform composite forming method DETAILED DESCRIPTION

[0021] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings.

[0022] According to the typical embodiment of the present application, according to the typical multi-structure integrated component requirements, the total thickness is designed to be 14 mm, wherein the woven layer surface layer (12) is 0.5 mm, the woven layer bottom layer (15) is 4.5 mm, the hollow support layer (14) is 5 mm, the cylinder inner diameter is 300 mm, and the height is 150 mm. The woven layer is formed by using the rotation body weaving method, the bottom layer (15) has 8 ends / cm of warp density and 4 ends / cm of weft density, 8 layers of warp yarns, the hollow support layer (14) has an "8" shape support, the surface layer (12) has 8 ends / cm of warp density and 4 ends / cm of weft density, and 2 layers of warp yarns. The rotation body woven fabric with a hollow structure is formed. The cloth felt mixed layer is filled in the hollow support layer (14), the woven hollow structure needle punching layer (13) is consistent with the hollow support layer (14) in thickness, which is 5 mm, the cloth felt ratio is 1:1, and the needle punching density is 30 needles / cm 2 The cloth felt is filled in the hollow support layer (14) according to the 1:1 ratio. After filling, the needle punching is performed in the radial direction, and the composite layer with the hollow support structure and the needle punching structure is formed. The surface layer is laid according to the cloth felt ratio of 1:2, and the needle punching is performed, the needle punching layer (11) has a thickness of 4 mm, and the needle punching density is 25 needles / cm 2 Finally, the composite forming of the woven needle punching preform is realized.

[0023] Compared with the existing multi-structure integrated composite material forming method, the forming method provided by the present application has the following advantages:

[0024] By filling the cloth felt mixed layer in the woven hollow structure fabric and performing needle punching, the integrated forming of the cloth felt mixed layer and the hollow structure fabric is realized, the interface connection effect of the two structures is improved, the needle punching structure-woven structure transition connection is realized by laying and needle punching on the surface layer, better interface connection effect and stronger interlayer bonding capacity are obtained, and the interlayer damage under the service condition of the multi-structure integrated composite material can be improved.

[0025] For those skilled in the art, under the inspiration of the patent concept and specific embodiments, some modifications can be directly derived or inferred from the patent disclosure and attempts. Those skilled in the art will realize that other methods can also be used, or the known technologies in the technical center are replaced, and the features are changed and modified, for example, a multi-layer hollow support structure layer is used, or a winding layer is added to the surface layer and other two-dimensional composite material forming methods. The same can be applied, and the functions and effects described in the patent can be realized, and will not be described one by one, and all belong to the protection scope of the patent.

[0026] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for composite forming of woven needle-punched preforms, characterized in that, Includes the following steps: a) Based on the working conditions of the composite material, set the parameters of the needle-punched layer (1), the braided layer and the braided hollow structure needle-punched layer (3); b) Determine the structure and corresponding weaving process scheme of the top layer (2), hollow support layer (4) and bottom layer (5) based on the weaving layer parameters; c) Form and weave hollow structure fabrics according to the weaving process; d) Determine the fabric and felt materials and proportions, as well as the fabric and felt mixed filling materials and proportions inside the hollow structure, based on the parameters of the needle-punched layer (1) and the hollow structure needle-punched layer (3); e) Fill the cloth and felt mixture layer into the hollow support layer (4) of the woven hollow structure fabric; f) The woven hollow structure fabric with filling felt mixed layer is needled from the surface layer (2) structure to the hollow structure needle-punched layer (3); g) After the needle punching of the fabric and felt in the hollow structure is completed, fiber cloth and fiber felt are laid on the surface layer (2) of the hollow structure fabric and continue to be needle punched until the thickness of the needle punch layer (1) is reached, forming a needle punched weaving-needle punched composite structure preform.

2. The method for composite forming of a woven needle-punched preform according to claim 1, characterized in that, The woven layer is formed by using three-dimensional weaving, three-dimensional machine weaving, and three-dimensional knitting processes to create a hollow support layer.

3. The method for composite forming of a woven needle-punched preform according to claim 1, characterized in that, The bottom layer (5), hollow support layer (4) and surface layer (2) are combined in different proportions.

4. The method for composite forming of a woven needle-punched preform according to claim 1, characterized in that... The hollow structure is filled with different fabric and felt materials than the needle-punched layer.

5. The method for composite forming of a woven needle-punched preform according to claim 1, characterized in that, The needle punching process parameters for the internal filling fabric, felt needle punching density, and needle punching depth of the hollow structure are different from those for the needle punching layer.

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