阅读说明：本技术 一种直升机桨叶内埋盒形装置及其成型方法 (Helicopter blade embedded box-shaped device and forming method thereof ) 是由 高乐 胡和平 张仕明 邓旭东 周云 孟微 余智豪 于 2019-10-10 设计创作，主要内容包括：本发明属于直升机桨叶制造技术,具体涉及一种直升机桨叶内埋盒形装置及其成型方法。本发明直升机桨叶内埋盒形装置包括上框、中框、下框、水平向螺座、垂直向螺座。本发明直升机桨叶内埋盒形装置的成型方法,使用复合材料预浸料对上框、中框及下框进行固化预成型,然后用胶接方式成型固化成为盒形结构,利用机械加工方式加工出水平向螺座和垂直向螺座,在中框上开孔,并在中框孔中安装水平向螺座,将垂直向螺座胶接在盒形结构内壁,然后进行固化成型。本发明既实现了盒形装置轻质化,又满足了盒形装置强度、刚度要求,同时实现了盒形装置内埋在桨叶内维形的功能,具有较大的实际应用价值。(The invention belongs to the manufacturing technology of helicopter blades, and particularly relates to an embedded box-shaped device of a helicopter blade and a forming method thereof. The invention relates to a helicopter blade embedded box-shaped device which comprises an upper frame, a middle frame, a lower frame, a horizontal screw base and a vertical screw base. The invention relates to a method for forming a helicopter blade embedded box-shaped device, which comprises the steps of performing curing preforming on an upper frame, a middle frame and a lower frame by using a composite prepreg, forming and curing into a box-shaped structure by using a glue joint mode, processing a horizontal screw seat and a vertical screw seat by using a machining mode, forming a hole on the middle frame, installing the horizontal screw seat in a hole of the middle frame, gluing the vertical screw seat on the inner wall of the box-shaped structure, and then performing curing forming. The box-shaped device is light, meets the requirements of strength and rigidity of the box-shaped device, realizes the function of dimensional shape of the box-shaped device embedded in the blade, and has higher practical application value.)

1. The utility model provides a bury box-shaped device in helicopter paddle which characterized in that, includes upper ledge (1), center (2), lower frame (3), water to spiral shell seat (4), perpendicularly to spiral shell seat (5), wherein, after upper ledge (1), center (2) and the equal independent solidification of lower frame, glue each other again and glue the shaping box-shaped structure, the level inlays to spiral shell seat (4) level and establishes in the center hole, fixes at the box-shaped structure inner wall through gluing the mode to spiral shell seat (5) perpendicularly, just upper ledge (1) upper surface is for taking the airfoil profile, with the laminating of airfoil on the paddle, and lower frame (3) lower surface is for taking the airfoil profile, with the laminating of paddle lower airfoil.

2. The helicopter blade embedded box device according to claim 1, characterized in that the upper and lower faces of the middle frame (2) are planar.

3. The helicopter blade embedded box-shaped device as claimed in claim 1, wherein the upper frame (1), the middle frame (2) and the lower frame (3) are all formed by prepreg curing and preforming of the same composite material.

4. The helicopter blade embedded box shaped device according to claim 1, characterized in that the horizontal screw base (4) and the vertical screw base (5) are both made of metal material and machined.

5. A helicopter blade embedded box assembly as claimed in claim 1, wherein said box structure has a greater height adjacent the leading edge of the blade than adjacent the trailing edge of the blade.

6. -buried box according to claim 1, characterised in that said box is provided with a smaller number of vertical seats (5) adjacent to the inner wall of the blade than adjacent to the inner wall of the trailing edge of the blade.

7. A method for forming a helicopter blade embedded box-shaped device according to any one of claims 1 to 6, characterized in that composite prepreg is used to perform curing and preforming on the upper frame (1), the middle frame (2) and the lower frame (3), then the box-shaped structure is formed and cured by glue bonding, a horizontal screw seat (4) and a vertical screw seat (4) are machined by machining, a hole is formed on the middle frame (2), the horizontal screw seat (4) is installed in the hole of the middle frame (2), the vertical screw seat (5) is glued to the inner wall of the box-shaped structure, and then the box-shaped structure is cured and formed.

8. The method for forming the embedded box-shaped device of the helicopter blade according to claim 7, characterized in that the upper frame (1) and the lower frame (3) are both cured and preformed by using a pre-impregnated material of a composite material by adopting a layering process method, so that the upper surface of the upper frame (1) is a profile with an airfoil surface matched with the upper airfoil surface of the blade, and the lower surface of the upper frame (1) is a plane; the upper surface of the lower frame (3) is a plane, and the lower surface of the lower frame (3) is a profile with an airfoil, which is matched with the lower airfoil of the blade.

9. The method for forming a helicopter blade embedded box shaped device according to claim 7, characterized in that said middle frame (2) is cured and preformed by winding process using pre-impregnated material of composite material, and the upper and lower surfaces of the middle frame (2) are both flat.

10. Method for forming a buried box-shaped device for a helicopter blade according to claim 7 wherein the wall thickness of the upper frame (1), the middle frame (2), the lower frame (3) and the thickness of the horizontal screw base (4) are all equal.

11. The method for forming the helicopter blade embedded box-shaped device according to claim 7, wherein an adhesive film is adopted between the winding formed middle frame (2) and the layering formed upper frame (1) and lower frame (3), and the pressing, curing and forming are carried out.

12. The method for forming the embedded box-shaped device of the helicopter blade according to claim 7, wherein the contact surface of the horizontal screw seat (4) and the middle frame (2) adopts a knurling process, and the horizontal screw seat (4) and the middle frame (2) are installed in the opening of the middle frame after resin is coated or an adhesive film is pasted on the contact surface, and the installation of the horizontal screw seat (4) and the middle frame (2) is completed through curing.

13. The method for forming the embedded box-shaped device of the helicopter blade according to claim 7, wherein the outer surface of the vertical metal screw seat (5) is knurled, the contact surfaces of the vertical metal screw seat (5) and the upper frame (1), the middle frame (2) and the lower frame (3) are pasted with glue films or coated with resin, and a certain pressure perpendicular to the inner wall of the middle frame (2) is applied to the vertical metal screw seat (5) when the vertical metal screw seat (5) and the upper frame (1), the middle frame (2) and the lower frame (3) are cured.

Technical Field

The invention belongs to the manufacturing technology of helicopter blades, and particularly relates to an embedded box-shaped device of a helicopter blade and a forming method thereof.

Background

The appearance structure of the traditional helicopter blade is a compromise considering various flight states, is a fixed structure and cannot achieve the optimal performance in various flight states. In recent years, with the rapid development of the fields of intelligent structures, artificial intelligence and the like, the deformable blade becomes a research hotspot in the field of helicopters. The deformable paddle is a new technology which takes intelligent materials and structures as drivers to realize local deformation or global deformation of the paddle, and the structural realization of the deformable paddle needs independent area space inside the narrow paddle and is used for installing and arranging devices for realizing paddle deformation or measuring paddle deformation such as drivers, cables or optical fibers. In general, a buried box device is adopted to realize the independent area space in the blade during the design and manufacture of the blade.

As the blade is of an airfoil-shaped structure, the box-shaped device buried in a narrow space is also of an irregular airfoil-shaped structure. The forming mode which is most easily realized in engineering is a mode of machining by adopting a metal material, but the mode has the defects that the additional weight of the helicopter blade is increased violently, and the application range of the novel deformable blade is severely limited; the composite material box-shaped device can also be processed by adopting a chopped fiber preforming mode, but the box-shaped device processed by the forming mode cannot meet the installation and use requirements of the internal intelligent material driver caused by centrifugal force when the helicopter blade is in a normal rotating operation state in the aspects of strength and rigidity.

Disclosure of Invention

The purpose of the invention is as follows: the helicopter blade embedded box-shaped device can meet the requirements of installation of an intelligent material driver and the like on the strength and the rigidity of the box-shaped device and can realize light weight.

In addition, the forming method of the embedded box-shaped device of the helicopter blade meets the requirement of the function of embedding the embedded box-shaped device in the blade (namely the upper surface and the lower surface of the box-shaped device can be attached to the upper wing surface and the lower wing surface in the blade).

The technical scheme of the invention is as follows: the utility model provides a bury box-shaped device in helicopter paddle, its includes that upper ledge 1, center 2, lower frame 3, level are to spiral shell seat 4, perpendicularly to spiral shell seat 5, wherein, after upper ledge 1, center 1 and lower frame 3 all independently solidify the shaping, glue each other again and glue the shaping box-shaped structure, the level inlays to spiral shell seat 4 level and establishes in center 2 holes, fixes at the box-shaped structure inner wall through gluing the mode perpendicularly to spiral shell seat 5, just 1 upper surface of upper ledge is for taking the airfoil, laminates with paddle upper airfoil, and 3 lower surfaces of lower frame are for taking the airfoil, laminates with the paddle lower airfoil.

The upper surface and the lower surface of the middle frame 2 are both planes.

The upper frame 1, the middle frame 2 and the lower frame 3 are all formed by curing and preforming prepreg made of the same composite material.

The horizontal screw seat 4 and the vertical screw seat 5 are made of metal materials and are machined in a machining mode.

The height of the box-shaped structure close to the front edge of the blade is larger than the height of the box-shaped structure close to the rear edge of the blade.

The number of the vertical screw bases 5 arranged on the box-shaped structure close to the inner wall of the blade is less than the number of the vertical screw bases 5 arranged on the inner wall close to the rear edge of the blade.

A forming method of the helicopter blade embedded box-shaped device comprises the steps of performing curing preforming on an upper frame 1, a middle frame 2 and a lower frame 3 by using composite prepreg, forming and curing the prepreg into a box-shaped structure in a gluing mode, processing a horizontal screw seat 4 and a vertical screw seat 5 by using a machining mode, forming holes in the middle frame 2, installing the horizontal screw seat 4 in the holes in the middle frame 2, gluing the vertical screw seat 5 to the inner wall of the box-shaped structure, and performing curing forming.

The upper frame 1 and the lower frame 3 are both solidified and preformed by using a pre-impregnated material of a composite material by adopting a layering process method, so that the upper surface of the upper frame 1 is a profile with an airfoil, which is matched with the upper airfoil of the blade, and the lower surface of the upper frame 1 is a plane; the upper surface of the lower frame 3 is a plane, and the lower surface of the lower frame 3 is a profile with an airfoil, which is matched with the lower airfoil surface of the blade.

The middle frame 2 is solidified and preformed by using a pre-impregnated material of a composite material by adopting a winding process method, and the upper surface and the lower surface of the middle frame 2 are both planes.

The wall thicknesses of the upper frame 1, the middle frame 2 and the lower frame 3 are equal to the thickness of the horizontal screw seat.

Glue films are adopted between the middle frame 2 formed by winding and the upper frame 1 and the lower frame 3 formed by laying layers, and the glue films are pressed, cured and formed.

The contact surface of the horizontal screw seat 4 and the middle frame 2 adopts a knurling process, the horizontal screw seat is coated with resin or is mounted in the hole of the middle frame 2 after being pasted with an adhesive film, and the horizontal screw seat 4 and the middle frame 2 are mounted through curing.

The outer surface of the metal vertical screw seat 5 adopts a knurling process, glue films are pasted or resin is coated on the contact surfaces of the vertical screw seat 5 and the upper frame 1, the middle frame 2 and the lower frame 3, and a certain pressure vertical to the inner wall of the middle frame 2 is applied to the metal vertical screw seat 5 when the metal vertical screw seat 5, the upper frame 1, the middle frame 2 and the lower frame 3 are solidified.

The invention has the beneficial effects that: according to the forming method of the helicopter blade embedded box-shaped device, the processed composite material box-shaped device is obtained by processing through the processes of performing each block step by step and then gluing, so that the box-shaped device is light, the requirements of installation of an intelligent material driver and the like on the strength and rigidity of the box-shaped device are met, and the function of embedding the box-shaped device in the blade is realized. Compared with the conventional blade embedded box-shaped device, the device has the advantages of remarkable technical progress, prominent technical effect and larger practical application value.

Drawings

FIG. 1 is a schematic diagram of a structure of a box-shaped device embedded in a blade;

FIG. 2 is a block schematic view of the cartridge;

FIG. 3 is a flow chart of a method for forming a box-shaped device by a process;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention relates to a box-shaped device for embedding a helicopter blade, which is formed by adopting a block design and comprises an upper frame 1, a middle frame 2, a lower frame 3, a horizontal screw seat 4 and a vertical screw seat 5, wherein the box-shaped device is formed by aiming at the characteristics of each part: the upper frame 1 and the lower frame 3 with wing profiles are formed by adopting a composite prepreg laying curing and molding process method, the middle frame 2 with the same thickness is formed by adopting a composite prepreg winding and molding process method, the horizontal screw seat 4 and the vertical screw seat 5 are formed by adopting a metal machining method, and finally, all parts are bonded and cured by a bonding method.

Please refer to fig. 1, which is a schematic view illustrating an installation of the embedded box-shaped device for helicopter blades according to the present invention. The box-shaped device is mounted inside a helicopter blade for mounting various accessories and supporting the blade structure.

Referring to fig. 2, a structural schematic view of the helicopter blade embedded box device of the present invention is shown. The embedded box-shaped device for the helicopter blades comprises an upper frame 1, a middle frame 2, a lower frame 3, a horizontal screw seat 4 and a vertical screw seat 5. The lower surface of the upper frame 1 and the upper surface of the lower frame 3 are planes and are in butt joint with the middle frame 2, and the opposite surfaces are airfoil surfaces and are respectively in fit with the upper airfoil surface and the lower airfoil surface of the blade, so that the function of the box-shaped device embedded in the blade in a dimensional shape is realized. The upper surface and the lower surface of the middle frame 2 are both planes, namely the division surfaces between the upper frame 1 and the middle frame 2 and between the middle frame 2 and the lower frame 3 are planes. In addition, the upper frame 1, the middle frame 2 and the lower frame 3 are all formed by prepreg curing and preforming of the same composite material, so that the integrated structure is formed by subsequent bonding and curing.

The horizontal screw seat 4 and the vertical screw seat 5 are made of metal materials and are machined in a machining mode. The horizontal screw base 4 is embedded into a hole of the middle frame 2 and used for horizontally mounting the device inside the blade through screws. The vertical screw base 5 is used for installing a vertical device through screws and is fixed on the inner wall of the box-shaped structure in a gluing mode.

In addition, the height of each position of the box-shaped structure (i.e. in the direction of the thickness of the blade in reference to fig. 1) is dynamically adjusted according to the size of the box-shaped device and the position in the blade to match the blade airfoil. Wherein the height of the box-shaped structure adjacent to the front edge of the blade is greater than the height of the box-shaped structure adjacent to the rear edge of the blade.

The number of the vertical screw bases 5 arranged on the box-shaped structure close to the front edge of the blade is less than that of the vertical screw bases 5 arranged on the inner wall close to the rear edge of the blade, so that the box-shaped device and the blade girder can be connected conveniently.

Please refer to fig. 3, which is a flowchart illustrating a method for forming a box-shaped device embedded in a helicopter blade according to the present invention. When the forming method of the helicopter blade embedded box-shaped device is implemented specifically, the process is as follows:

step 1: block preforming and screw seat processing for box-shaped device

The upper frame 1 is cured and preformed by using a pre-impregnated material of a composite material by adopting a layering process method, during implementation, prepreg layering is firstly carried out, the number of layering at each position of the upper frame is determined according to the area of each section of the circumference of the upper frame 1, the upper surface of the upper frame 1 with the airfoil surface is obtained by utilizing mould forming, and then the layered upper frame 1 and the mould thereof are placed into a curing furnace for curing and forming so as to obtain the surface matched with the upper airfoil surface of the blade;

the middle frame 2 is cured and preformed by using a pre-impregnated material of a composite material by adopting a winding process method, firstly, the pre-impregnated material of the composite material is wound in an inner layer die, after the winding is finished, the dimension of the middle frame 2 is maintained by using an outer layer die, and finally, the wound middle frame 2 and the die thereof are placed in a curing furnace for curing and forming;

the lower frame 3 is cured and preformed by using a pre-impregnated material of a composite material by adopting a layering process method, during implementation, prepreg layering is firstly carried out, the number of layering at each position is determined according to the area of each section of the circumference of the lower frame 3, the lower surface of the lower frame 3 with the airfoil surface is obtained by utilizing mold molding, and then the layered lower frame 3 and the mold thereof are placed into a curing furnace for curing molding to obtain the profile matched with the lower airfoil surface of the blade;

thereby realizing the function of the box-shaped device embedded in the blade for maintaining the shape;

the horizontal screw seat 4 and the vertical screw seat 5 are machined in a machining mode, and the gluing surfaces are processed by a knurling process.

Step 2: horizontal screw base 2 installation

A hole is made in the center frame 2 to fit the horizontal screw base 4 into the hole. When the holes are formed, the holes are only allowed to be formed on one side of the middle frame 2, and the holes are formed on the upper surface of the middle frame 2 or on the lower surface of the middle frame 2, and the holes are 1/3 which are not larger than the height of the middle frame 2 in the height direction, so that the middle frame 2 is kept to have certain rigidity; the size of the opening is consistent with that of the horizontal screw seat 4, and a small amount of installation gaps are reserved so that the horizontal screw seat 4 can be inserted into the opening of the middle frame.

And step 3: one-step glue joint forming

And carrying out primary glue joint and curing on the upper frame 1, the lower frame 3 and the middle frame 2 provided with the horizontal screw seat 4 to form a primary glue joint part. Before glue joint, glue films are pasted on the contact surfaces of the upper frame, the middle frame and the lower frame, and the resin contained in the glue films is the same as the resin in the composite material prepreg used by the frames; the glue joint surfaces of the horizontal screw seat 4 and the hole of the middle frame 2 adopt resin which is coated with composite material prepreg used by the frame and is of the same series, so that the preformed pieces are firmly glued together when in glue joint molding; the glue joint surface of the horizontal screw seat 4 and the upper frame 1 adopts the same glue film glue joint. And finally, uniformly applying pressure to the primary glue-joint forming piece through the mould, and putting the primary glue-joint forming piece into a curing furnace for curing and forming.

And 4, step 4: secondary cementing formation

And carrying out secondary gluing and curing on the primary gluing forming piece and the vertical screw base 5 to obtain the box-shaped device with the embedded blade. Adhering an adhesive film to the adhesive surface of the screw seat 5 vertically, wherein the resin contained in the adhesive film is the same as the resin in the composite material prepreg used by the frame; the position of the vertical screw seat 5 in the box-shaped device is positioned through a mould, and uniform pressure vertical to the inner wall of the middle frame 2 is applied to the vertical screw seat 5 through the mould; and finally, placing the secondary gluing piece and the die thereof into a curing furnace for curing and molding, thereby obtaining the box-shaped device with the embedded blade.

Taking a 4-meter-diameter blade embedded box-shaped device as an example, compared with the existing common titanium alloy box-shaped device, the box-shaped device disclosed by the invention has the advantages that on the premise that the requirements on strength and rigidity are met, the weight of the box-shaped device is only half that of the titanium alloy box-shaped device, and the box-shaped device is easier to be cured and molded with a composite blade.

The foregoing is merely a detailed description of the embodiments of the present invention, and some of the conventional techniques are not detailed. The scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.