Controllable liquid volume block type forming die of flyfish-like aerial unmanned vehicle

Abstract

The application discloses a flyfish-imitating aviation unmanned aerial vehicle controllable liquid quantity block type forming die, and belongs to the technical field of unmanned aerial vehicle part manufacturing. The die comprises a die frame, a lower die, an upper die and an injection assembly; the upper die adopts a tortoise shell split type design, is formed by a plurality of shell units which are engaged and spliced through a sawtooth structure, and is filled with sealing silica gel at a joint, so that the die is losslessly opened; the injection assembly is integrated with a pressure sensor, cooperates with a spiral conveying and pressurized injection structure, realizes closed loop accurate control on resin injection quantity and glue injection pressure, and effectively reduces defects such as dry spots and delamination. The application has the characteristics of high-precision forming and easy die opening, and significantly improves the quality consistency and production efficiency of composite material components.

Description

Technical Field

[0001] This invention relates to the field of drone component manufacturing technology, and more specifically to a segmented molding die for a controllable liquid volume of a flying fish-shaped drone. Background Technology

[0002] Carbon fiber liquid molding technology, as an important composite material manufacturing process, has wide applications in aerospace, wind power, automotive, shipbuilding, rail transportation, sporting goods, and infrastructure. With its high efficiency and low cost, this technology has become one of the key development directions for the large-scale application of composite materials in the future, and is particularly suitable for the manufacturing of high-precision components such as aircraft parts and automotive parts.

[0003] However, this technology still faces significant technical bottlenecks in its implementation. Due to the strong chemical adsorption between the resin matrix and the mold surface, coupled with the thermal shrinkage stress during material curing and the localized micro-tightening effect caused by the complex mold geometry, the mold opening resistance increases significantly. If a forced mold opening method is used, the enormous interlaminar shear force can easily lead to fiber delamination (i.e., delamination), severely compromising the structural integrity of the component. Simultaneously, localized stress concentrations may exceed the strength limit of the resin or fiber-resin interface, causing brittle fracture at the component's edges or in weak areas.

[0004] Even more challenging is that the stress generated during mold making can further exacerbate existing defects in manufacturing. For example, dry spots can form in areas where the resin fails to fully impregnate the fiber bundles. These areas, lacking sufficient resin support, are highly susceptible to developing into crack initiation sites under stress, severely weakening the tensile, flexural, and fatigue properties of the part. The coupled effect of defects such as delamination, cracking, and dry spots not only reduces product yield but also hinders the full realization of the core advantages of lightweight and high-strength composite materials, becoming a key technological bottleneck restricting the manufacturing of high-precision, complex-shaped composite components.

[0005] Therefore, to address the difficulties and dry spot problems inherent in traditional liquid molding dies during mold opening, and to improve the manufacturing precision and product quality of composite material components, there is an urgent need to develop a novel mold structure. This invention aims to provide a segmented molding die with controllable liquid volume, inspired by the Flying Fish UAV, to meet the aforementioned technical challenges and promote the further development of aerospace carbon fiber liquid molding technology. Summary of the Invention

[0006] In view of this, the present invention provides a segmented molding die with controllable liquid volume for a flying fish-like unmanned aerial vehicle, aiming to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A segmented molding die for controlling the liquid volume of a flying fish-like unmanned aerial vehicle, comprising:

[0009] A mold frame, comprising a base plate, a top plate, and multiple support columns connecting the base plate and the top plate, wherein multiple hydraulic cylinders are mounted on the top plate;

[0010] The lower mold is fixed to the base plate by a lower support rod.

[0011] The upper mold is located above the lower mold and is composed of multiple shell units in a tortoise-shell split shape. Adjacent shell units are interlocked by a serrated structure, which restricts their vertical displacement. Some of the shell units are connected one-to-one with the telescopic cylinders of the hydraulic cylinders, while the remaining shell units are linked by the adjacent shell units. The serrated structure between adjacent shell units is filled with sealing silicone. The middle shell unit has an injection channel, and the top surface of the lower mold has a cavity with a curved topology structure similar to that of a flying fish-shaped UAV that communicates with the injection channel.

[0012] An injection assembly is installed on the top surface of the housing unit in the middle of the upper mold, and the injection port of the injection assembly is connected to the top end of the injection channel. The pressure sensor of the injection assembly is installed at the bottom end of the injection channel.

[0013] Through the above technical solution, the present invention uses a tortoise-shell split multi-shell unit splicing upper mold, combined with a sawtooth interlocking and silicone sealing structure, to achieve high-precision molding and non-destructive mold opening of complex curved surface components; at the same time, with the help of an injection component with integrated pressure sensor, precise closed-loop control of resin injection volume and pressure is achieved, effectively reducing defects such as dry spots and delamination, and significantly improving the molding quality, consistency and production efficiency of composite material components.

[0014] It should be noted that, in order to achieve high-precision molding and non-destructive mold opening of complex curved surface components, this invention employs a tortoise-shell split upper mold structure, which is composed of multiple independent shell units interlocked by a serrated structure and filled with sealing silicone. Unlike traditional one-piece upper molds, the multiple shell units in this invention are driven by independent hydraulic cylinders. Although the hydraulic system can achieve synchronous control, due to factors such as mechanical response and load differences, there will still be slight asynchronous displacements between the units during the mold opening process. It is precisely this slight asynchrony that constitutes the key to non-destructive mold opening:

[0015] During the mold opening process, each shell unit has a small asynchronous displacement, which makes the mold opening force between the mold and the molded part dispersed and gradual, avoiding the huge local tensile force and shear stress generated when the integral mold is opened at one time, thus effectively preventing damage such as fiber delamination and edge breakage.

[0016] During mold forming, the adjacent units are interlocked and limited by a serrated structure, and the joints are filled with sealing silicone. This ensures the overall airtightness and geometric accuracy of the cavity, while allowing for slight relative floating between units. This allows the mold to adapt to complex curved surfaces under pressure, ensuring high-precision replication of the forming surface.

[0017] Therefore, this invention achieves the dual goals of high-precision molding and non-destructive mold opening through the synergistic effect of controllable micro-asynchronous displacement and flexible sealing connection structure, significantly improving the manufacturing quality and yield of complex curved surface composite material components.

[0018] Preferably, in the above-mentioned segmented molding die for controllable liquid volume of a flying fish-like drone, the injection assembly further includes a mounting plate fixed to the top surface of the housing unit in the middle of the upper mold. An injection housing is fixed on the mounting plate. The top end of the injection housing has a material injection port, and the bottom end has an injection nozzle. The injection port of the injection nozzle is connected to the top end of the glue injection channel.

[0019] Preferably, in the above-mentioned segmented molding die for controllable liquid volume of a flying fish-like unmanned aerial vehicle, a drive motor is installed at the top of the injection shell, the power output shaft of the drive motor is connected to a helical blade shaft, and the material injection port corresponds to the top of the helical blade shaft.

[0020] Preferably, in the above-mentioned segmented molding die for controllable liquid volume of a flying fish-like unmanned aerial vehicle, a pressure device is installed at the bottom end of the injection shell. The pressure device is used to pressurize the material conveyed by the spiral blade shaft and inject it into the injection nozzle.

[0021] Preferably, in the above-mentioned segmented molding die for controllable liquid volume of a flying fish-like unmanned aerial vehicle, a guide rod is fixed to the top of the injection shell, and the guide rod passes through the top plate and is slidably connected to the top plate.

[0022] Preferably, in the above-mentioned segmented molding die for a controllable liquid volume of a flying fish-like unmanned aerial vehicle, the sealing silicone allows adjacent shell units to have vertically misaligned movable gaps.

[0023] Preferably, in the above-mentioned segmented molding die for controllable liquid volume of a flying fish-shaped unmanned aerial vehicle, a slider is fixed on the side wall of the lower die and the upper die on the same side, and a slide rail corresponding to the slider is fixed on the base plate, and the slider is slidably connected to the slide rail.

[0024] Preferably, in the above-mentioned segmented molding mold for controllable liquid volume of a flying fish-like unmanned aerial vehicle, a stand and a guide frame are fixed on one side of the base plate, and a rotating shaft is rotatably connected to the top of the stand via a bearing seat. A sprocket is fixed on the rotating shaft. A counterweight is slidably connected to the guide frame, and a balance chain is connected between the counterweight and the upper mold. The balance chain is wound around the sprocket and meshes with the sprocket.

[0025] Preferably, in the above-mentioned segmented molding die for controllable liquid volume of a flying fish-like unmanned aerial vehicle, the counterweight includes a box and a cover, and the box is provided with multiple counterweight blocks inside.

[0026] Preferably, in the above-mentioned segmented molding die for controllable liquid volume of a flying fish-like unmanned aerial vehicle, rollers that cooperate with the guide frame are rotatably connected to both sides of the box body.

[0027] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a segmented molding die with controllable liquid volume for a flying fish-like unmanned aerial vehicle, which has the following beneficial effects:

[0028] 1. Achieve non-destructive mold opening for complex curved surfaces: Adopting a tortoise-shell split multi-block mold design, the asynchronous action between unit shells greatly reduces mold opening resistance and avoids component delamination and cracking.

[0029] 2. Precise control of resin injection volume and pressure: Closed-loop control is achieved through spiral conveying, pressurized injection and real-time pressure sensor feedback to reduce defects such as dry spots and porosity.

[0030] 3. Ensure smooth and reliable mold movement: The use of slider guide rails, counterweight balance and chain drive system ensures stable mold closing and opening process, improves molding consistency and equipment life.

[0031] 4. Excellent sealing performance: The modules adopt a serrated interlocking and silicone filling structure, which effectively prevents resin leakage and ensures uniform pressure inside the cavity.

[0032] 5. Compact and easy to adjust: The modular design of the mold frame and injection components facilitates installation, maintenance and process parameter adjustment, and adapts to the needs of multi-variety production. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0034] Figure 1 The attached figure is a schematic diagram of the segmented molding die for controllable liquid volume of the imitation flying fish drone provided by the present invention.

[0035] Figure 2 The attached figure is a cross-sectional view of the segmented molding die for controllable liquid volume of the imitation flying fish drone provided by the present invention.

[0036] Figure 3 The attached figure is a schematic diagram of the upper mold provided by the present invention;

[0037] Figure 4 The attached figure is a structural schematic diagram of the shell unit at one corner of the upper mold provided by the present invention;

[0038] Figure 5 The attached figure is a schematic diagram of the injection assembly provided by the present invention;

[0039] Figure 6 The attached figure is a schematic diagram of the support frame and guide frame structure provided by the present invention;

[0040] Figure 7 The attached figure is a schematic diagram of the structure of the counterweight provided by the present invention.

[0041] in:

[0042] 1-Mold frame; 11-Base plate; 12-Top plate; 13-Support column; 14-Slide rail; 15-Upright frame; 151-Bearing seat; 152-Rotating shaft; 153-Sprocket; 16-Guide frame; 17-Counterweight; 171-Box body; 172-Lid body; 173-Counterweight block; 174-Roller;

[0043] 2-Lower mold; 21-Lower support rod;

[0044] 3-Upper mold; 31-Housing unit; 311-Injection channel; 32-Serrated structure; 33-Follow-up guide rod;

[0045] 4-Injection assembly; 41-Pressure sensor; 42-Mounting plate; 43-Injection housing; 431-Material injection port; 432-Injection nozzle; 44-Drive motor; 45-Helical blade shaft; 46-Pressure pressurizer; 47-Guide rod;

[0046] 5-Hydraulic cylinder;

[0047] 6-Imitation of the curved surface topology structure cavity of the flying fish-shaped UAV;

[0048] 7-Slider;

[0049] 8-Balance chain. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] See appendix Figure 1 To be continued Figure 4 This invention discloses a segmented molding die for a controllable liquid volume of a flying fish-like unmanned aerial vehicle, comprising:

[0052] The mold frame 1 consists of a base plate 11, a top plate 12, and multiple support columns 13 connecting the base plate 11 and the top plate 12. Multiple hydraulic cylinders 5 are installed on the top plate 12.

[0053] The lower mold 2 is fixed to the base plate 11 by the lower support rod 21;

[0054] The upper mold 3 is located above the lower mold 2, and is composed of multiple shell units 31 arranged in a tortoise-shell split shape. These shell units 31 are connected to the telescopic cylinders of multiple hydraulic cylinders 5. It should be noted that, as... Figure 1 and Figure 3 As shown, the four shell units 31 are driven by different hydraulic cylinders 5. The top surface of the shell unit 31 clamped between the four shell units 31 is fixed with a follower guide rod 33. The follower guide rod 33 passes through the top plate 12 and is slidably connected to the top plate 12. When the hydraulic cylinder 5 drives the four shell units 31 to move up and down, the shell unit 31 clamped between the four shell units 31 moves together with the four shell units 31. During this process, the follower guide rod 33 moves up and down with the shell unit 31 fixedly connected to it, playing a guiding role. The adjacent shell units 31 are engaged by a sawtooth structure 32, so that the adjacent shell units 31 form a vertical displacement restriction. The sawtooth structure 32 between the adjacent shell units 31 is filled with sealing silicone. The shell unit 31 in the middle has a glue injection channel 311. The top surface of the lower mold 2 is provided with a cavity 6 of the curved topology structure of the flying fish aviation UAV that communicates with the glue injection channel 311.

[0055] Injection assembly 4 is installed on the top surface of housing unit 31 in the middle of upper mold 3, and the injection port of injection assembly 4 is connected to the top of injection channel 311. Pressure sensor 41 of injection assembly 4 is installed at the bottom of injection channel 311.

[0056] See appendix Figure 5The injection assembly 4 also includes a mounting plate 42 fixed on the top surface of the middle housing unit 31 of the upper mold 3. An injection housing 43 is fixed on the mounting plate 42. The top end of the injection housing 43 has a material injection port 431, and the bottom end has an injection nozzle 432. The injection port of the injection nozzle 432 is connected to the top end of the glue flow channel 311.

[0057] To further optimize the above technical solution, a drive motor 44 is installed at the top of the injection housing 43, and the power output shaft of the drive motor 44 is connected to a spiral blade shaft 45. The material injection port 431 corresponds to the top of the spiral blade shaft 45.

[0058] To further optimize the above technical solution, a pressure device 46 is installed at the bottom of the injection housing 43. The pressure device 46 is used to pressurize the material conveyed by the spiral blade shaft 45 and inject it into the injection nozzle 432.

[0059] To further optimize the above technical solution, a guide rod 47 is fixed at the top of the injection housing 43. The guide rod 47 passes through the top plate 12 and is slidably connected to the top plate 12.

[0060] To further optimize the above technical solution, the sealing silicone allows adjacent housing units 31 to have a vertically offset movable gap.

[0061] See appendix Figure 6 A slider 7 is fixed on the side wall of the lower mold 2 and the upper mold 3 on the same side. A slide rail 14 corresponding to the slider 7 is fixed on the base plate 11. The slider 7 is slidably connected to the slide rail 14.

[0062] To further optimize the above technical solution, a stand 15 and a guide frame 16 are fixed on one side of the base plate 11. The top of the stand 15 is rotatably connected to a rotating shaft 152 through a bearing seat 151. A sprocket 153 is fixed on the rotating shaft 152. A counterweight 17 is slidably connected to the guide frame 16. A balance chain 8 is connected between the counterweight 17 and the upper mold 3. The balance chain 8 is wound around the sprocket 153 and meshes with the sprocket 153.

[0063] See appendix Figure 7 The counterweight 17 includes a box 171 and a cover 172, and the box 171 is equipped with multiple counterweight blocks 173.

[0064] To further optimize the above technical solution, rollers 174 that cooperate with the guide frame 16 are rotatably connected to both sides of the housing 171.

[0065] The present invention discloses a segmented molding die for controlling the liquid volume of a flying fish-shaped unmanned aerial vehicle, the working principle of which is as follows:

[0066] 1. Mold Closing and Sealing Process: Multiple hydraulic cylinders 5 push the corresponding housing units 31 downwards, causing the upper mold 3 and lower mold 2 to close. The serrated structures 32 between adjacent housing units 31 interlock, forming vertical displacement restrictions to ensure cavity alignment during mold closing. The sealing silicone filled in the serrated structures 32 deforms under pressure, filling the joint gaps to achieve cavity sealing and prevent resin leakage.

[0067] 2. Fiber Preform Laying Process: Before mold closing, the operator pre-cuts and lays multiple layers of carbon fiber fabric or fiber preforms on the cavity surface of the lower mold 2 according to the shape of the cavity 6 of the simulated flying fish aviation drone curved surface topology structure. These fiber preforms constitute the reinforcing skeleton of the composite material component. The subsequently injected resin will penetrate and impregnate the fiber bundles, ultimately forming a dense fiber-resin composite structure.

[0068] 3. Controlled Liquid Injection Process: Resin material enters the injection housing 43 through the material injection port 431. The drive motor 44 drives the spiral blade shaft 45 to rotate, realizing the delivery and initial mixing of the material. Subsequently, the pressure injector 46 pressurizes the material to ensure that the resin is injected into the injection nozzle 432 at a stable pressure. The pressure sensor 41 monitors the pressure at the bottom of the injection channel 311 in real time and feeds it back to the control system to realize closed-loop control of injection pressure and flow rate, thereby accurately controlling the resin injection volume and filling process.

[0069] 4. Segmented Mold Opening Process: After curing, the hydraulic cylinder 5 lifts each housing unit 31. Due to the serrated structure 32 and sealing silicone between adjacent units, the housing unit 31 experiences slight asynchronous displacement, achieving segmented mold opening. The slider 7 cooperates with the slide rail 14 to ensure that the upper mold 3 maintains stable movement during the opening and closing process, avoiding damage to the molded parts.

[0070] 5. Balancing and Auxiliary Structure: The balancing chain 8 passes around the sprocket 153 and connects the upper mold 3 and the counterweight 17. The counterweight block 173 inside the counterweight 17 can adjust the overall counterweight, balance the load during mold movement, reduce the burden on the hydraulic cylinder 5, and ensure smooth lifting. The roller 174 rolls along the guide frame 16 to further ensure smooth movement of the counterweight 17.

[0071] 6. Bionic Curved Surface Molding: The cavity 6, formed by the closure of the upper mold 3 and the lower mold 2, mimics the curved surface topology of a flying fish-shaped aircraft, replicating the wing-shaped curved surface of a flying fish to ensure that the molded part possesses aerodynamic characteristics. During the injection process, the resin fully fills all corners of the cavity under pressure, and combined with the real-time monitoring of the pressure sensor 41, effectively reduces dry spots and porosity defects.

[0072] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0073] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A segmented molding die for controlling the liquid volume of a flying fish-like unmanned aerial vehicle, characterized in that, include: The mold frame (1) is composed of a base plate (11), a top plate (12) and multiple support columns (13) connecting the base plate (11) and the top plate (12). Multiple hydraulic cylinders (5) are installed on the top plate (12). The lower mold (2) is fixed to the base plate (11) by a lower support rod (21); The upper mold (3) is located above the lower mold (2) and is composed of multiple shell units (31) in the form of a tortoise shell splitting. The adjacent shell units (31) are engaged by a sawtooth structure (32) so that the adjacent shell units (31) form a vertical displacement restriction. Among the multiple shell units (31), some shell units (31) are connected to the telescopic rods of multiple hydraulic cylinders (5) one by one. The remaining shell units (31) are linked by the adjacent shell units (31). The sawtooth structure (32) between the adjacent shell units (31) is filled with sealing silicone. The middle shell unit (31) has an injection channel (311). The top surface of the lower mold (2) is provided with a cavity (6) of the curved topology structure of the flying fish aviation UAV that communicates with the injection channel (311). Injection assembly (4), which is installed on the top surface of the housing unit (31) in the middle of the upper mold (3), and the injection port of the injection assembly (4) is connected to the top of the glue injection channel (311), and the pressure sensor (41) of the injection assembly (4) is installed at the bottom of the glue injection channel (311).

2. The segmented molding die for a controllable liquid volume of a simulated flying fish unmanned aerial vehicle according to claim 1, characterized in that, The injection assembly (4) further includes a mounting plate (42) fixed on the top surface of the housing unit (31) in the middle of the upper mold (3). An injection housing (43) is fixed on the mounting plate (42). The top end of the injection housing (43) has a material injection port (431) and the bottom end has an injection nozzle (432). The injection port of the injection nozzle (432) is connected to the top end of the glue injection channel (311).

3. The segmented molding die for a controllable liquid volume of a simulated flying fish unmanned aerial vehicle according to claim 2, characterized in that, A drive motor (44) is installed at the top of the injection housing (43), and the power output shaft of the drive motor (44) is connected to a spiral blade shaft (45). The material injection port (431) corresponds to the top of the spiral blade shaft (45).

4. The segmented molding die for a controllable liquid volume of a simulated flying fish unmanned aerial vehicle according to claim 3, characterized in that, A pressure device (46) is installed at the bottom of the injection housing (43). The pressure device (46) is used to pressurize the material conveyed by the helical blade shaft (45) and inject it into the injection nozzle (432).

5. A segmented molding die for a controllable liquid volume of a simulated flying fish unmanned aerial vehicle according to claim 4, characterized in that, The top end of the injection housing (43) is fixed with a guide rod (47), which passes through the top plate (12) and is slidably connected to the top plate (12).

6. The segmented molding die for a controllable liquid volume of a simulated flying fish unmanned aerial vehicle according to claim 1, characterized in that, The sealing silicone allows adjacent housing units (31) to have vertically misaligned movement gaps.

7. The segmented molding die for a controllable liquid volume of a simulated flying fish unmanned aerial vehicle according to claim 1, characterized in that, The upper mold (3) has a slider (7) fixed on its side wall, and the base plate (11) has a slide rail (14) corresponding to the slider (7) fixed on it. The slider (7) is slidably connected to the slide rail (14).

8. The segmented molding die for a controllable liquid volume of a simulated flying fish unmanned aerial vehicle according to claim 1, characterized in that, A stand (15) and a guide frame (16) are fixed on one side of the base plate (11). The top of the stand (15) is rotatably connected to a rotating shaft (152) through a bearing seat (151). A sprocket (153) is fixed on the rotating shaft (152). A counterweight (17) is slidably connected on the guide frame (16). A balance chain (8) is connected between the counterweight (17) and the upper mold (3). The balance chain (8) is wound around the sprocket (153) and meshes with the sprocket (153).

9. A segmented molding die for a controllable liquid volume of a simulated flying fish unmanned aerial vehicle according to claim 8, characterized in that, The counterweight (17) includes a box (171) and a cover (172), and the box (171) is provided with multiple counterweight blocks (173).

10. A segmented molding die for a controllable liquid volume of a simulated flying fish unmanned aerial vehicle according to claim 9, characterized in that, The box (171) is rotatably connected to two sides by rollers (174) that cooperate with the guide frame (16).

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