Process for manufacturing a variable configuration conical member and internal inflation device therefor

Abstract

The application discloses a variable-configuration conical member preparation process and an internal expansion device thereof and belongs to the field of variable-configuration aircraft member preparation. The rigid-flexible coupling member preparation is effectively realized by using resin material and rubber material for partition curing, the internal expansion operation is realized on the variable-configuration conical member by the internal expansion device, the shape change of the conical member is effectively realized by using the flexible part of the member, the variable-configuration function in the cross-medium process is realized, compared with the prior art, the variable-configuration conical member of the application reduces the underwater resistance under the condition of ensuring the strength, and ensures the stable connection of the conical body member and the front end part.

Description

Technical Field

[0001] This invention belongs to the field of variable configuration aircraft component manufacturing, and relates to a variable configuration conical component manufacturing process and its internal expansion device. Background Technology

[0002] Single-degree-of-freedom variable-configuration transmedia composite materials are suitable for navigation in air and water by changing their structural shape. Variable-configuration transmedia composite prefabricated components meet flight requirements in air, and can be modified as needed in water to reduce drag, while also meeting pressure resistance requirements, structural strength requirements in transmedia conditions, and structural accuracy requirements.

[0003] Research on cross-medium composite materials should optimize the fuselage structure as much as possible while ensuring strength. Currently, three-dimensional weaving technology is mainly used to achieve the integrated molding of preforms. However, after the resin is cured, the shape of the conical component is fixed, which cannot reduce the resistance it experiences underwater and makes it difficult to ensure a stable connection between the conical component and the front end.

[0004] Therefore, a new technology is needed to solve the above problems. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a process for preparing a variable configuration conical component and an internal expansion device. A preform is prepared by a combination of weaving and needle punching, and then resin and rubber are added separately for partitioned curing to form a composite material component. The internal expansion device realizes the variable configuration function of the conical component, which reduces underwater resistance while ensuring strength and ensures a stable connection between the conical component and the front end.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0007] A process for manufacturing a variable-configuration conical component includes the following steps:

[0008] (1) Several trapezoidal fabric preforms were prepared using 2.5D weaving or rotary weaving;

[0009] (2) The trapezoidal fabric preform is needle-punched and sewn to obtain the precursor of the modified conical component, so as to carry out the partitioning treatment of the modified conical component;

[0010] (3) The precursor of the modified conical component is cured in sections using resin material and rubber material. The needle-stitched part is cured with rubber material and the trapezoidal fabric preform is cured with resin material to obtain the conical preform of the modified conical component. The conical preform is expanded with an internal expansion device to break the original fibers of the needle-stitched part, while retaining the rubber material, thus completing the preparation of the modified conical component.

[0011] The specific implementation details of needle suturing in step (2) are as follows: control the structural density of the needle suturing part so that the fibers of the needle suturing part break when the internal expansion device is working.

[0012] In step (3), the curing ratio of resin and rubber materials is set according to the deformation degree of the modified conical component. Specifically, the deformation degree of the modified conical component is defined as follows: if the radii of the upper and lower end faces of the conical component before the internal expansion are R1 and R2 respectively, and the radii of the upper and lower end faces of the conical component after the internal expansion are R3 and R4 respectively, the deformation degree is:

[0013]

[0014] In step (3), during the curing process, the rubber material is linearly distributed along the needle-punched part. Therefore, the deformation of the needle-punched part is controlled as follows: the rubber material usually fractures when the linear strain reaches ε0 = 2.8 to 3. The linear strain of the rubber material is controlled to be ε1 ≤ ε0.

[0015] In step (3), the curing ratio of the rubber material is determined, and the length of the rubber material on the upper end is:

[0016]

[0017] The length of the rubber material at the lower end is:

[0018]

[0019] The slope of the distribution length is:

[0020]

[0021] To achieve the above objectives, the internal expansion device solution provided by the present invention is as follows:

[0022] An internal expansion device for a variable-configuration conical component includes several thin rods connected to the variable-configuration conical component, several rod supports for fixing the thin rods, several shaft supports fixed to one end of the rod supports, a lead screw serving as the transmission part of the internal expansion device, a slider nested on the lead screw, a lead screw shaft support fixed to the other end of the rod supports and integrally fitted with the slider, and a motor fixed to the bottom of the lead screw; the top end of the thin rods of the internal expansion device is connected to the variable-configuration conical component.

[0023] When the internal expansion device is working, the motor drives the lead screw to rotate, causing the slider to move the lead screw bearing seat upward or downward, which in turn causes the rod support to expand or contract the thin rod, thereby enabling the variable configuration conical component to expand or contract.

[0024] When the cone-shaped preform of the variable configuration cone component is prepared after the initial expansion, the elastic modulus of the rubber material is E, and the deformation of the rubber part is ε1. The driving force required by the internal expansion device is:

[0025]

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] This invention effectively achieves the fabrication of rigid-flexible coupled components by using resin and rubber materials for partitioned curing. The internal expansion device enables the internal expansion operation of the variable-configuration conical component, which can effectively change the shape of the conical component by utilizing the flexible part of the component. This realizes the variable configuration function in the cross-medium process, reduces underwater resistance while ensuring strength, and ensures a stable connection between the conical component and the front end. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a trapezoidal prefabricated body in the variable configuration conical component of the present invention.

[0029] Figure 2 This is a schematic diagram of needle stitching and partition curing between trapezoidal preforms in the variable configuration conical component of the present invention.

[0030] Figure 3 This is a schematic diagram of the conical prefabricated structure in the conical component of the present invention.

[0031] Figure 4 This is a schematic diagram of the internal expansion device of the present invention.

[0032] Figure 5 This is a schematic diagram of the internal expansion device before it is fully extended in this invention.

[0033] Figure 6 This is a schematic diagram of the internal expansion device after it has been expanded in this invention. Detailed Implementation

[0034] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0035] This invention provides a process for manufacturing a tapered component with a variable configuration, comprising the following steps:

[0036] (1) As Figure 1 As shown, a trapezoidal fabric preform with a height of h is prepared using 2.5D weaving or rotary weaving.

[0037] (2) Figure 2 As shown, the trapezoidal fabric preform is needle-punched and sewn to obtain the precursor of the modified conical component, so as to carry out the partitioning treatment of the modified conical component;

[0038] (3) Figure 2 As shown, resin and rubber materials are used to cure the modified conical component in sections. The needle-stitched portion is cured with rubber material, while the trapezoidal fabric preform is cured with resin material, resulting in a conical preform of the modified conical component. Figure 3 As shown, the conical preform is an integral structure. An internal expansion device is used to expand the conical preform to break the original fibers in the needle-stitched part, while retaining the rubber material, thus completing the preparation of the modified conical component.

[0039] In step (3), the degree of deformation of the variable-configuration conical component is defined as follows: If the radii of the upper and lower end faces of the conical component before the internal expansion are R1 and R2 respectively, and if the radii of the upper and lower end faces of the conical component after the internal expansion are R3 and R4 respectively, the degree of deformation is:

[0040]

[0041] In step (3), the deformation of the rubber matrix region is controlled as follows: Rubber has high elasticity and usually fractures when the linear strain ε0 = 2.8 to 3. During the curing process, the rubber material is linearly distributed along the needle-punched part. Therefore, the linear strain of the rubber material is controlled to be ε1 (ε1≤ε0). At this time, when the original fibers break during the needle-punching stitch, the rubber material part remains intact, so as to achieve the purpose of changing the configuration.

[0042] In step (3), the curing ratio of the rubber resin is determined, and the length of the rubber on the upper end face is:

[0043]

[0044] The length of the rubber on the lower end face is:

[0045]

[0046] The slope of the distribution length is:

[0047]

[0048] This invention discloses an internal expansion device 1 for a variable-configuration conical member. Please refer to [link / reference]. Figure 4As shown, the device includes a thin rod 2, a rod support 3, a shaft support 4, a lead screw bearing seat 5, a motor 6, a slider 7, and a lead screw 8. The thin rod 2 is fixed by a pair of upper and lower rod supports 3. One end of each rod support 3 is fixed via the shaft support 4, and the other end is fixed via the lead screw bearing seat 5. The lead screw bearing seat 5 is fixed to the slider 7. The motor 6 is fixed to the lower end of the lead screw 8, and the slider 7 is nested on the lead screw 8. During operation, the motor 6 drives the lead screw 8 to rotate, causing the slider 7 to move the lead screw bearing seat 5 upwards along the lead screw 8. This causes the rod support 3 to cause the thin rod 2 to expand outwards from the center, thus achieving an expansion effect for the tapered component. When the motor 6 drives the lead screw 8 to rotate in the opposite direction, the slider 7 causes the lead screw bearing seat 5 to move downwards along the lead screw 8, causing the rod support 3 to cause the thin rod 2 to contract from the outside towards the center, thus achieving a contraction effect for the variable-configuration tapered component.

[0049] When the precast cone of the variable configuration cone component completes its initial expansion, the required support force from the internal expansion device is: (E is the elastic modulus of the rubber, and ε1 is the deformation of the rubber portion).

[0050]

[0051] Please see Figure 5 As shown, the conical component described in this invention is a complete cone shape before the expansion device is opened, which is the state before cross-medium navigation; please refer to... Figure 6 As shown, the internal expansion device of the conical component of the present invention, when expanded, consists of multiple dispersed sheet-like structures, which can effectively reduce underwater resistance during cross-medium navigation.

[0052] The variable-configuration conical component manufacturing process and internal expansion device described in this invention can effectively realize the change of the conical component's shape, achieving variable configuration functionality during cross-medium navigation. Compared to existing technologies, while ensuring strength, it reduces the underwater drag of the component during cross-medium navigation, and simultaneously ensures a stable connection between the conical component and the front end.

[0053] There are many methods and approaches to implement this technical solution, and the above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. A process for manufacturing a variable-configuration conical component, comprising the following steps: (1) Prepare several trapezoidal fabric preforms with a height of h using 2.5D weaving or rotary weaving; (2) The trapezoidal fabric preform is needle-punched and sewn to obtain the precursor of the modified conical component, so as to carry out the partitioning treatment of the modified conical component; (3) The modified conical component is cured in sections using resin and rubber materials. The needle-stitched part is cured with rubber material and the trapezoidal fabric preform is cured with resin material to obtain the conical preform of the modified conical component. The conical preform is expanded with an internal expansion device to break the original fibers of the needle-stitched part, while retaining the rubber material, thus completing the preparation of the modified conical component.

2. The manufacturing process of a variable-configuration conical component according to claim 1, characterized in that: In step (2), the structural density of the needle-stitched part is controlled so that the fibers of the needle-stitched part break when the internal expansion device is working.

3. The manufacturing process of a variable-configuration conical component according to claim 2, characterized in that: In step (3), the curing ratio of the rubber material is set according to the degree of deformation of the modified conical component.

4. The manufacturing process of a variable-configuration conical component according to claim 3, characterized in that: The degree of deformation of a variable-configuration conical member is defined as follows: If the radii of the upper and lower end faces of the variable-configuration conical member before the internal expansion are R1 and R2 respectively, and the radii of the upper and lower end faces of the variable-configuration conical member after the internal expansion are R3 and R4 respectively, the degree of deformation is: 。 5. The manufacturing process of a variable-configuration conical component according to claim 4, characterized in that: During the curing process, the rubber material is linearly distributed along the needle-punched part. Therefore, the deformation of the needle-punched part is controlled as follows: the rubber material usually fractures when the linear strain reaches ε0=2.8~3. The linear strain of the rubber material is controlled to be ε1≤ε0.

6. The manufacturing process of a variable-configuration conical component according to claim 4, characterized in that: When determining the curing ratio of the rubber material, the length of the rubber material on the upper end face of the variable configuration conical component is: The length of the rubber material at the lower end face of the variable-configuration conical component is: The slope of the distribution length is: 。 7. An internal expansion device for a variable-configuration conical member used in any one of the manufacturing processes of claims 1 to 6, characterized in that: The device includes several thin rods connecting the variable-configuration conical components, several rod supports for fixing the thin rods, several shaft supports fixed to one end of the rod supports, a lead screw serving as the transmission part of the internal expansion device, a slider nested on the lead screw, a lead screw bearing seat fixed to the other end of the rod supports and integrally formed with the slider, and a motor fixed to the bottom of the lead screw. The top end of the thin rods of the internal expansion device is connected to the variable-configuration conical components. When the internal expansion device is working, the motor drives the lead screw to rotate, causing the slider to drive the lead screw bearing seat to move. The slider drives the lead screw bearing seat to move upward or downward, which can cause the rod supports to drive the thin rods to expand or contract, thereby allowing the variable-configuration conical components to expand or contract. When the conical preform of the variable-configuration conical components completes its initial expansion, the elastic modulus of the rubber material is... The deformation of the rubber part is Under these conditions, the driving force required from the internal expansion device is: In the formula: The length of the rubber material on the upper end face of the variable-configuration conical component. The length of the rubber material on the upper end face of the variable configuration conical component.

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