Forming die for positioning structure of reinforcing frame of unmanned aerial vehicle

Abstract

The utility model discloses an unmanned aerial vehicle reinforcing frame positioning structure forming mold and belongs to the technical field of aviation composite material forming. The problems that in the prior art, the cost of a reinforcing frame forming tool cannot be reduced, and better positioning forming is needed to guarantee the accuracy of a molded surface are solved. Each loose piece is composed of a fixing part and a forming part which are integrally formed, the fixing part of each loose piece and the base assembly are positioned and tightened through a positioning pin and a screw, the forming parts of the loose pieces jointly form a product model, and a stripping groove is formed in the forming part of each loose piece. According to the utility model, the circumferential multi-section movable block is adopted, so that the demolding problem of large-size frame product parts is solved, and the forming quality of the parts is improved. The forklift grooves and the hanging rings are arranged, so that the problem that tools are inconvenient to transfer is solved, multi-selectivity transfer of the tools is facilitated, and operation of workers is facilitated. The base assembly is of a square steel frame welding type structure, the overall strength of the frame is improved, production and machining time is saved, and manufacturing cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of aviation composite material molding, and specifically relates to a molding die for a positioning structure of a reinforcement frame of an unmanned aerial vehicle. Background Art

[0002] Carbon fiber composite materials are increasingly widely used in aircraft due to their high specific strength, high specific modulus, light weight, corrosion resistance, fatigue resistance, and strong designability. The application of composite materials in aircraft has gradually developed from non-load-bearing parts and secondary load-bearing parts to main load-bearing parts, and has developed in the direction of large-scale, complex, and integrated. The amount of advanced composite materials used has become an important indicator of the advancement of aircraft.

[0003] Composite parts are usually formed by the vacuum bag method. If the reinforcement frame is not positioned properly during molding, it is likely that the position of the reinforcement frame will move during curing, affecting the molding quality. Utility Model Content

[0004] In order to solve the problems that the prior art cannot reduce the cost of the reinforcement frame forming tooling and that better positioning and forming are needed to ensure the accuracy of the profile, the utility model provides a UAV reinforcement frame positioning structure forming mold.

[0005] The technical solution adopted by the utility model is:

[0006] A UAV reinforcement frame positioning structure forming mold comprises a base assembly and a plurality of movable blocks arranged and installed on the base assembly according to the product appearance; each movable block is composed of an integrally formed fixing portion and a forming portion, the fixing portion of each movable block is positioned and tightened with the base assembly by a positioning pin and a screw, the forming portions of the plurality of movable blocks together constitute a product model, and a demoulding groove is provided on the forming portion of each movable block.

[0007] Compared with the prior art, the utility model has the following beneficial effects:

[0008] 1. The utility model adopts a circumferential multi-stage movable block, which solves the demoulding problem of large-size frame product parts and improves the molding quality of parts.

[0009] 2. The utility model is provided with forklift slots and lifting rings, which solves the problem of inconvenient tooling transfer and is more convenient for multi-selective tooling transfer and operation by staff.

[0010] 3. The base assembly of the utility model adopts a square steel frame welded structure, which increases the overall strength of the frame, makes the frame beautiful in appearance, saves production and processing time, and saves manufacturing costs.

[0011] 4. The utility model adopts ordinary steel Q235-AF material. The selection of materials ensures cost reduction. The thermal expansion ratio of composite materials and tooling materials is taken into consideration during design. The thermal expansion coefficient of the tooling is 0.999106537, which makes it easier to ensure the outer dimensions of the parts after forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 It is the front view of the utility model;

[0014] Figure 3 It is a side view of the utility model;

[0015] Figure 4 It is a top view of the utility model;

[0016] Figure 5 It is an axonometric drawing of the base assembly of the utility model;

[0017] Figure 6 This is a schematic diagram of the structure of a movable block of the utility model;

[0018] Figure 7 This is a schematic diagram of the structure of the second movable block of the utility model;

[0019] Figure 8 It is a schematic diagram of the three structures of the movable block of the utility model;

[0020] Fig. 9 This is a schematic diagram of the structure of the fourth movable block of the utility model;

[0021] Fig.10 This is a schematic diagram of the structure of the fifth movable block of the utility model;

[0022] Fig.11 This is a schematic diagram of the structure of the sixth movable block of the utility model;

[0023] Fig.12 This is a schematic diagram of the structure of the movable block seven of the utility model;

[0024] Fig.13 This is a schematic diagram of the structure of the movable block eight of the utility model;

[0025] Fig.14 This is a schematic diagram of the structure of the movable block nine of the utility model;

[0026] Fig.15 This is a schematic diagram of the structure of the movable block of the utility model;

[0027] Fig.16 This is a schematic diagram of the structure of the eleventh movable block of the utility model;

[0028] Among them: 1. Base assembly; 2. Loose piece 1; 3. Loose piece 2; 4. Loose piece 3; 5. Loose piece 4; 6. Loose piece 5; 7. Loose piece 6; 8. Loose piece 7; 9. Loose piece 8; 10. Loose piece 9; 11. Loose piece 10; 12. Loose piece 11; 13. Loose piece; 14. Fixing part; 15. Forming part; 16. De-mold groove; 17. Plate; 18. Positioning hole; 19. Threaded hole; 20. Forklift groove; 21. Lifting ring. DETAILED DESCRIPTION

[0029] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0030] like Figures 1 to 16 As shown, the utility model is a molding die for the positioning structure of a reinforcement frame of an unmanned aerial vehicle, comprising a base assembly 1, and a plurality of movable blocks 13 arranged and installed on the base assembly 1 according to the product appearance; each of the movable blocks 13 is composed of an integrally formed fixing portion 14 and a molding portion 15, the fixing portion 14 of each movable block 13 is positioned and tightened with the base assembly 1 by a positioning pin and a screw, the molding portions 15 of the plurality of movable blocks 13 together constitute a model of the product, and a demolding groove 16 is provided on the molding portion 15 of each movable block 13.

[0031] The shape of the movable block 13 is basically set according to the shape of the product, in order to save materials, be light in size and not easy to deform; each movable block 13 is provided with a demolding groove 16, in order to facilitate demolding after curing, to facilitate separation of the movable block 13 from the product, to facilitate demolding of the product, and to avoid damaging the product parts.

[0032] like Figure 1 , Figure 6 to Figure 16 As shown, the plurality of movable blocks 13 are respectively movable block 1 2, movable block 2 3, movable block 3 4, movable block 4 5, movable block 5 6, movable block 6 7, movable block 7 8, movable block 8 9, movable block 9 10, movable block 10 11 and movable block 11 12. The movable block 1 2, movable block 2 3, movable block 3 4, movable block 4 5, movable block 5 6, movable block 6 7, movable block 7 8, movable block 8 9, movable block 9 10, movable block 10 11 and movable block 11 12 are assembled into an integral mold according to the appearance of the product.

[0033] like Figure 5 As shown, the base assembly 1 is made of square steel to form a rectangular base, and a template 17 is arranged on the top surface of the rectangular base. The template 17 is provided with positioning holes 18 and threaded holes 19 for connecting the movable block 13 to ensure that the movable block 13 can be well positioned and tightened after being transferred to the base assembly 1, so that the position and profile of the movable block 13 are accurate; a target hole is provided on the template 17, and its function is to facilitate detection. After the movable block 13 and the base assembly 1 are combined and processed, a measuring instrument is used to detect whether its profile is accurate to ensure that the subsequently manufactured products are qualified.

[0034] A forklift slot 20 is provided on the side of the rectangular base, which is used to facilitate the transfer of the tooling by forklift;

[0035] Side plates for mounting lifting rings 21 are arranged on the sides of the rectangular base, so as to facilitate the smooth lifting and transfer of the tooling.

[0036] The base assembly 1 is welded with Q235-AF, and is heat treated after welding to eliminate stress. It is then CNC machined to mill out the shape, the movable block mounting surface and the movable block mounting threaded holes 19, and then is processed on site to smooth the surface.

[0037] The plurality of movable blocks 13 are cut from Q235-AF material, and then machined by a CNC machine tool, with a certain amount of machining reserved within the mold surface to produce screw holes and pin holes.

[0038] Each movable block 13 is installed on the base assembly 1, and is tightened with screws. The pin holes for positioning the movable blocks 13 on the base assembly 1 are prepared after assembly, and then the positioning pins are installed; the final profile, scoring lines, and inspection holes are milled out through CNC machining, and then the burrs are trimmed by the on-site tooling personnel, and the lifting ring 21 is installed. After all tooling parts are processed, the tooling profile and air tightness are tested. After the tooling is qualified, it is sent from the production workshop to the composite material workshop for use in the next step of part molding.

[0039] Part molding: Move the tooling to the designated location and clean it. Prepare the tooling for use. Prepare the raw materials and consumables required for molding parts. The staff begins to follow the process regulations to operate the paving and lay the product within the effective mold surface of the tooling. For the local reinforcement position of the product, the on-site operator performs the paving operation based on the reinforcement position reference line on the mold and laser projection. After the overall paving is completed, place A4000, breathable felt, vacuum bag, etc. to vacuum. Check the air tightness of the tooling. If there is no problem, enter the autoclave for molding. The tooling is subjected to thermal uniformity test and air tightness test according to M8217. After passing the inspection, proceed to the next step and then carry out high-temperature molding at a temperature of 120°C, a pressure of 0.6MPa, and a time of 6-8h. The temperature conductivity and uniformity of the tooling are required to be good. When the heating and cooling rates are 1-2°C / min, the difference between the minimum and maximum should be less than 30°C; the insulation time is 5h; the cooling is 30min until the temperature drops to room temperature, and qualified products are taken out. After molding, they are taken out of the autoclave, and the tooling temperature drops to room temperature. The vacuum bag and breathable felt are removed for demolding. After the parts are demolded, the edges are cleaned and trimmed. After trimming, the parts are sent to a professional testing agency for testing, and the test data are analyzed to make an overall evaluation of the parts.

[0040] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A UAV reinforcement frame positioning structure forming mold, characterized by: The invention comprises a base assembly (1), and a plurality of movable blocks (13) arranged and mounted on the base assembly (1) according to the appearance of a product; each movable block (13) is composed of a fixed portion (14) and a formed portion (15) formed in one piece; the fixed portion (14) of each movable block (13) is positioned and fastened to the base assembly (1) by means of a positioning pin and a screw; the formed portions (15) of the plurality of movable blocks (13) together form a model of the product; and a demoulding groove (16) is provided on the formed portion (15) of each movable block (13).

2. The UAV reinforcement frame positioning structure forming mold according to claim 1, characterized in that: The plurality of movable blocks (13) are respectively movable block one (2), movable block two (3), movable block three (4), movable block four (5), movable block five (6), movable block six (7), movable block seven (8), movable block eight (9), movable block nine (10), movable block ten (11) and movable block eleven (12). The movable block one (2), movable block two (3), movable block three (4), movable block four (5), movable block five (6), movable block six (7), movable block seven (8), movable block eight (9), movable block nine (10), movable block ten (11) and movable block eleven (12) are assembled into an integral mold according to the appearance of the product.

3. The UAV reinforcement frame positioning structure forming mold according to claim 2, characterized in that: The base assembly (1) is made of square steel to form a rectangular base, and a template (17) is arranged on the top surface of the rectangular base. The template (17) is provided with a positioning hole (18) and a threaded hole (19) for connecting the movable block (13). The template (17) is provided with a target hole. A forklift groove (20) is provided on the side of the rectangular base. A side plate for installing a lifting ring (21) is provided on the side of the rectangular base.

4. The UAV reinforcement frame positioning structure forming mold according to claim 3, characterized in that: The base assembly (1) is welded using Q235-AF.

5. The UAV reinforcement frame positioning structure forming mold according to claim 4, characterized in that: The plurality of movable blocks (13) are cut from Q235-AF material.

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