阅读说明：本技术 一种蜂窝夹芯石墨烯隐身前缘及其加工方法 (Honeycomb sandwich graphene stealth front edge and processing method thereof ) 是由 党万腾 李宇飞 周子昀 方雄 蒲克强 刘明辉 熊雅晴 于 2020-10-27 设计创作，主要内容包括：本发明公开了一种蜂窝夹芯石墨烯隐身前缘及其加工方法,属于飞行器设计技术领域。包括前缘蒙皮、前缘腹板、前缘端肋、石墨烯蜂窝和机翼前梁；所述前缘蒙皮、前缘腹板和前缘端肋组合形成封闭空间作为石墨烯蜂窝的填充腔体,并通过胶膜与石墨烯蜂窝共固化整体成型为具有透波-吸波-透波功能的隐身前缘；所述隐身前缘通过可拆卸连接件与具备波反射功能的机翼前梁组合装配在一起。本发明所述隐身前缘结构利用石墨烯材料良好的吸波性能,通过巧妙的结构设计将材料性能特性转换为结构隐身特性；该前缘结构制造风险可控,装配和使用维护简便,普适性强,可广泛应用于各类隐身飞机的机翼或翼身前缘。(The invention discloses a honeycomb sandwich graphene stealth front edge and a processing method thereof, and belongs to the technical field of aircraft design. The composite structure comprises a front edge skin, a front edge web plate, a front edge end rib, a graphene honeycomb and a wing front beam; the front edge skin, the front edge web plate and the front edge end rib are combined to form a closed space as a filling cavity of the graphene honeycomb, and the closed space and the graphene honeycomb are co-cured and integrally formed through a glue film to form the stealth front edge with wave transmission-wave absorption-wave transmission functions; the stealth front edge is assembled with the wing front beam with the wave reflection function through a detachable connecting piece. The stealth leading edge structure utilizes the good wave absorbing performance of the graphene material, and converts the material performance characteristic into the structural stealth characteristic through ingenious structural design; the leading edge structure has controllable manufacturing risk, simple and convenient assembly, use and maintenance and strong universality, and can be widely applied to the leading edges of wings or wing bodies of various stealth airplanes.)

1. A honeycomb sandwich graphene stealth front edge is characterized in that: the composite structure comprises a front edge skin (1), a front edge web (3), a front edge end rib (5), a graphene honeycomb (2) and a wing front beam (7); the front edge skin (1), the front edge web (3) and the front edge end rib (5) are combined to form a closed space as a filling cavity of the graphene honeycomb (2), and the closed space and the graphene honeycomb (2) are co-cured and integrally formed into a stealth front edge with wave transmitting-absorbing-wave transmitting functions through a glue film (4); the stealth front edge is assembled with a wing front beam (7) with a wave reflection function through a detachable connecting piece.

2. The honeycomb sandwich graphene stealth front edge of claim 1, characterized in that: the detachable connecting piece is a connecting angle box (6), and a cavity inside the connecting angle box (6) is filled with wave-absorbing foam.

3. The honeycomb sandwich graphene stealth front edge of claim 1, characterized in that: the front edge skin (1) and the front edge web (3) are both C-shaped thin-wall structures, and the front edge end rib (5) is of a semi-open box-shaped structure.

4. The honeycomb sandwich graphene stealth front edge of claim 1, characterized in that: the graphene honeycomb (2) comprises a paper honeycomb and graphene powder filled in the paper honeycomb, and the adhesive film (4) is wrapped outside the graphene honeycomb (2) and is sealed.

5. The honeycomb sandwich graphene stealth front edge of claim 3, characterized in that: the front edge skin (1), the front edge web (3) and the front edge end rib (5) are all made of glass fiber reinforced plastic wave-transmitting materials.

6. The honeycomb sandwich graphene stealth front edge of claim 1, characterized in that: the front wing beam (7) is made of carbon fiber materials.

7. A processing method of a honeycomb sandwich graphene stealth front edge is characterized by comprising the following steps:

step a, performing prepregs of a front edge web (3) and a front edge end rib (5), and machining and molding a paper honeycomb required by the graphene honeycomb (2) to prepare a glue film (4) and graphene powder;

b, paving and sticking the prepreg of the front edge skin (1) on a front edge skin (1) mould for forming, placing the paper honeycomb after bonding the first layer of adhesive film (4), filling graphene powder into the paper honeycomb, and then bonding the second layer of adhesive film (4) to seal the graphene honeycomb (2);

step c, nesting and fitting the pre-formed front edge web (3) and the front edge end rib (5) with the glue film (4), fixing the front edge web and the front edge end rib by using a combined die, and co-curing and forming to prepare the integrally detachable graphene invisible front edge;

and d, respectively curing the front wing beam (7) and the connecting angle box (6), positioning the front wing beam on an assembly jig, bonding the front wing beam and the connecting angle box into a fixed structure, forming an installation interface of the detachable stealth front edge, mechanically connecting the detachable stealth front edge with the detachable stealth front edge, and combining the detachable stealth front edge and the detachable stealth front edge to form the honeycomb sandwich graphene stealth front edge.

8. The processing method of the honeycomb sandwich graphene stealth leading edge according to claim 7, wherein a carbon fiber fabric prepreg is adopted for the wing front beam (7) and is made into a C-shaped beam structure through female die forming, and a glass fiber reinforced plastic fabric prepreg is adopted for the connecting corner box (6) and is made into a box structure through male die forming.

9. The processing method of the honeycomb sandwich graphene stealth leading edge according to claim 7, wherein the leading edge skin (1) is formed by a female die, and the leading edge web (3) and the leading edge end rib (5) are formed by a male die.

10. The processing method of the honeycomb sandwich graphene stealth front edge according to claim 7, characterized by further comprising a step e of filling wave-absorbing foam in an inner cavity of the connection corner box (6).

Technical Field

The invention belongs to the field of airplane structure design and the technical field of stealth, and particularly relates to a honeycomb sandwich graphene stealth front edge used for a strong scattering area of a wing or a wing body front edge of a stealth airplane.

Background

With the continuous improvement of radar detection capability, the requirement of modern battlefield environment on the stealth performance of the airplane is higher and higher. With the continuous development of the appearance stealth technology, the stealth performance of the airplane realizes qualitative leap. On the basis, the stealth performance of the airplane is further improved, and the stealth problem of local strong scattering sources needs to be further solved on the basis of the appearance stealth.

The aircraft wing with the invisible appearance generally adopts a sweep angle to improve the invisible performance of the aircraft in the head direction, however, for the aircraft with the omnidirectional invisible requirement, the RCS of the front edge of the wing or the wing body (flying wing layout) forms a peak value in the vertical direction, so that the solution of the strong scattering characteristic of the front edge of the wing or the wing body of the aircraft becomes the key of the invisible appearance aircraft to further improve the omnidirectional invisible performance of the whole aircraft.

In recent years, due to excellent optical, electrical, thermal and mechanical properties of graphene materials, revolutionary and fierce in the fields of materials, energy sources and the like, good wave-absorbing performance of the graphene materials is continuously proved in laboratories, however, under the condition that graphene prepreg is not mature, how to convert the wave-absorbing performance of the graphene materials into engineering practical stealth structures becomes an important factor for breaking through the current graphene stealth technology.

Disclosure of Invention

The invention aims to overcome the problem that the stealth performance of a graphene material breaks through in engineering application, provides a honeycomb sandwich graphene stealth front edge, and improves the stealth performance of the front edge of an airplane wing or a wing body by combining a composite honeycomb sandwich structure and graphene powder; meanwhile, a processing method of the honeycomb sandwich graphene stealth front edge is further provided.

The purpose of the invention is realized by the following technical scheme:

a honeycomb sandwich graphene stealth front edge is characterized in that: the composite structure comprises a front edge skin, a front edge web plate, a front edge end rib, a graphene honeycomb and a wing front beam; the front edge skin, the front edge web plate and the front edge end rib are combined to form a closed space as a filling cavity of the graphene honeycomb, and the closed space and the graphene honeycomb are co-cured and integrally formed through a glue film to form the stealth front edge with wave transmission-wave absorption-wave transmission functions; the stealth front edge is assembled with the wing front beam with the wave reflection function through a detachable connecting piece.

The detachable connecting piece is a connecting angle box, and a cavity inside the connecting angle box is filled with wave-absorbing foam.

The front edge skin and the front edge web are both of C-shaped thin-wall structures, the front edge end rib is of a semi-open box-shaped structure, and a closed space is formed after the front edge skin and the front edge web are combined to serve as a filling cavity of the graphene honeycomb.

Further, the graphene honeycomb comprises a paper honeycomb and graphene powder filled in the paper honeycomb, and the adhesive film is wrapped outside the graphene honeycomb and seals the graphene honeycomb.

Furthermore, the front edge skin, the front edge web plate and the front edge end rib are all made of glass fiber reinforced plastic wave-transmitting materials.

Further, the wing front beam is made of carbon fiber materials.

A processing method of a honeycomb sandwich graphene stealth front edge is characterized by comprising the following steps:

step a, performing prepregs of a front edge web plate and a front edge end rib, machining and molding a paper honeycomb required by a graphene honeycomb, and preparing a glue film and graphene powder;

b, paving and sticking a front edge skin prepreg on a front edge skin mould for molding, placing the paper honeycomb after bonding a first layer of adhesive film, filling graphene powder into the paper honeycomb, and then bonding a second layer of adhesive film to seal the graphene honeycomb;

step c, nesting and attaching the pre-formed front edge web plate and the front edge end rib with the glue film, fixing the front edge web plate and the front edge end rib through a combined die, and co-curing and forming to manufacture the integrally detachable graphene stealth front edge;

and d, respectively curing the front wing beam and the connecting angle box, positioning the front wing beam and the connecting angle box on an assembly jig, and then adhering the front wing beam and the connecting angle box into a fixed structure to form an installation interface of the detachable stealth front edge, wherein the installation interface is mechanically connected with the detachable stealth front edge.

Furthermore, the front wing beam is made into a C-shaped beam structure by adopting carbon fiber fabric prepreg and forming through a female die so as to ensure the assembly precision of the nesting surface; the connecting angle box is made of glass fiber reinforced plastic fabric prepreg and is molded into a box-shaped structure through a male die.

Further, the front edge skin is molded by adopting a female die so as to ensure the surface quality of the front edge appearance; the front edge web plate and the front edge end rib are molded by adopting a male die so as to ensure the assembly precision of the nesting surface.

Furthermore, in order to improve the local stealth performance of the connecting areas at the two ends of the stealth front edge, wave-absorbing foam is filled in the inner cavity of the connecting angle box.

The beneficial effects of this technical scheme are as follows:

1. the stealth leading edge structure utilizes the good wave absorbing performance of the graphene material, and converts the material performance characteristic into the structural stealth characteristic through ingenious structural design; the leading edge structure has controllable manufacturing risk, simple and convenient assembly, use and maintenance and strong universality, and can be widely applied to the leading edges of wings or wing bodies of various stealth airplanes;

2. the stealth front edge structure flexibly uses various materials such as glass fiber, carbon fiber, paper honeycomb, adhesive film, graphene powder, wave-absorbing foam and the like, and comprehensively uses various composite material forming processes to prepare a full-size stealth structure with wave-transmitting-wave-absorbing-wave-transmitting-reflecting-wave-transmitting-wave-absorbing-wave-transmitting functions, so that electromagnetic waves are greatly attenuated after double absorption of multiple layers of penetrating loss and wave-absorbing layers;

3. the outer surface of the front edge of the stealth front edge structure is a film-pasting surface, so that the surface quality is high; the wave-absorbing function layer is of an integrally formed detachable structure, the front edge opening and the front beam fitting surface of the wing are film-pasting surfaces, the assembly precision is high, and the use and maintenance are simple and convenient; and the manufacturing risk is controllable, and the method has wide applicability.

Drawings

The foregoing and following detailed description of the invention will be apparent when read in conjunction with the following drawings, in which:

FIG. 1 is a schematic structural decomposition diagram of a typical honeycomb sandwich graphene stealth front edge;

FIG. 2 is a wave-absorbing schematic diagram of a typical honeycomb sandwich graphene stealth leading edge structure;

FIG. 3 is an enlarged schematic view of structure A of FIG. 2;

FIG. 4 is a side view and a cross-sectional view A of a typical honeycomb sandwich graphene stealth leading edge structure;

FIG. 5 is an enlarged schematic view of structure B of FIG. 4;

FIG. 6 is an enlarged schematic view of structure C of FIG. 4;

FIG. 7 is a cross-sectional view taken along line D of FIG. 4;

FIG. 8 is a cross-sectional view taken along line E in FIG. 4;

in the figure:

1. the structure comprises a front edge skin, 2 graphene honeycombs, 3 front edge webs, 4 adhesive films, 5 front edge end ribs, 6 connecting corner boxes, 7 and a wing front beam.

Detailed Description

The technical solutions for achieving the objects of the present invention are further illustrated by the following specific examples, and it should be noted that the technical solutions claimed in the present invention include, but are not limited to, the following examples.

Example 1

The embodiment discloses a honeycomb sandwich graphene stealth front edge which comprises a front edge skin 1, a front edge web 3, a front edge end rib 5, a graphene honeycomb 2, a connecting corner box 6 and an airfoil front beam 7. Fig. 1 is a schematic exploded view of a typical honeycomb sandwich graphene stealth front edge structure.

The front edge skin 1, the front edge web 3 and the front edge end rib 5 are all made of glass fiber reinforced plastic fabric prepreg with wave absorbing function. The detachable stealth front edge is formed by combining a front edge skin 1, a front edge web 3 and a front edge end rib 5 which are of C-shaped thin-wall structures, forming a closed space as a filling cavity of a graphene honeycomb 2 through combination, co-curing and integrally forming the graphene honeycomb and a paper honeycomb filled with graphene powder through a glue film 4 to form a detachable stealth front edge with wave transmitting, wave absorbing and wave transmitting functions, assembling the detachable stealth front edge with a wing front beam 7 with a wave reflecting function through a connecting angle box 6, and respectively forming a reflecting layer and a dismounting interface of the stealth front edge through the connecting angle box 6 and the wing front beam 7.

Graphene powder fills in the paper honeycomb and constitutes graphite alkene honeycomb 2, and glued membrane 4 wraps up in graphite alkene honeycomb 2 outside and seals it.

The front wing beam 7 is made of carbon fiber materials and forms a reflecting surface, so that electromagnetic waves are greatly attenuated after being doubly absorbed by a plurality of layers of penetration loss and wave-absorbing layers.

Furthermore, wave-absorbing foam is filled in the cavity inside the connecting angle box 6, the design can reduce the scattering strength of the connecting areas at the two ends of the front edge of the stealth, and the local stealth performance of the connecting areas at the two ends of the front edge of the stealth is further improved.

The scheme of the invention converts the material performance characteristic into the structural stealth characteristic through the ingenious structural design, and has novel design and creativity. The leading edge structure has controllable manufacturing risk, simple and convenient assembly, use and maintenance and strong universality, and can be widely applied to the leading edges of wings or wing bodies of various stealth airplanes.

Example 2

The embodiment discloses a processing method of a honeycomb sandwich graphene stealth front edge, which comprises the following steps:

1) the front edge web 3 and the front edge end rib 5 are pre-formed by adopting a glass fiber reinforced plastic fabric dipping material through a special die, wherein the front edge skin 1 and the front edge web 3 are of C-shaped thin-wall structures, the front edge end rib 5 is of a semi-open box-shaped structure, and a closed space is formed by combination and serves as a filling cavity of the graphene honeycomb 2.

2) The paper honeycomb required by the graphene honeycomb 2 is formed by machining, and sufficient adhesive film 4 and graphene powder are prepared.

3) Paving and sticking a glass fiber reinforced plastic prepreg of a front edge skin 1 on a front edge skin 1 mould for forming, then bonding a first layer of adhesive film 4, then placing a processed and formed graphene honeycomb 2, and bonding a second layer of adhesive film 4 to seal the graphene honeycomb 2 after filling graphene powder in the honeycomb; when bonding, it is necessary to ensure that all surfaces of the graphene honeycomb 2 are completely wrapped by the adhesive film 4 to form a sealed cavity. The combination of the front edge skin 1, the front edge web 3 and the front edge end rib 5 forms a closed cavity, and the double sealing formed by the integral molding of the glue film 4 ensures the stability and reliability of the structure.

4) Nesting and attaching the preformed front edge web 3 and the front edge end rib 5 with the glue film 4, fixing the front edge web and the front edge end rib by using a combined die, and then co-curing and forming to prepare the integrally detachable graphene stealth front edge functional layer.

5) The connecting angle box 6 and the wing front beam 7 are respectively cured and molded, positioned on an assembly frame and then glued into a fixed structure to form a mounting interface of the detachable stealth front edge, and the mounting interface is mechanically connected with a graphene stealth front edge functional layer through bolts, supporting plates and nuts to form a group of complete honeycomb sandwich graphene stealth front edge structures.

6) After the installation is finished, wave-absorbing foam is filled in the cavities in the connecting angle boxes 6 at the two ends so as to reduce the scattering strength of the connecting areas at the two ends of the front edge of the stealth and further improve the local wave-absorbing performance of the connecting areas at the two ends of the front edge of the stealth.

In the processing process, in order to ensure the surface quality of the front edge appearance, the skin is molded by adopting a female die; the front edge web 3 and the front edge end rib 5 are molded by adopting a male die so as to ensure the assembly precision of the nesting surface; the wing front beam 7 is molded by adopting a female die so as to ensure the assembly precision of the nesting surface; the connecting angle box 6 is formed by adopting a male die due to small volume influence so as to simplify the process.