Manufacturing method of bamboo unmanned aerial vehicle supporting frame

Abstract

The invention discloses a manufacturing method of a bamboo unmanned aerial vehicle supporting frame, and relates to the technical field of unmanned aerial vehicles, and the manufacturing method comprises the procedures of bamboo unit processing, bamboo unit pretreatment, mold design and manufacturing, bamboo unit gluing, assembling and forming, demolding control and component post-treatment. The bamboo units can be fine bamboo filaments or standard bamboo chips. Gluing and forming are achieved through a bamboo unit efficient dipping device and bamboo supporting frame manufacturing equipment which are submitted at the same time. The manufacturing method is unique in design, good in manufacturability and easy to produce in batches, the manufactured bamboo unmanned aerial vehicle supporting frame has the advantages of being large in strength-weight ratio, high in impact toughness and the like, the cost advantage and the environment-friendly characteristic of bamboo wood are combined, and the bamboo unmanned aerial vehicle supporting frame becomes an unmanned aerial vehicle supporting frame product with great potential; the existing aluminum alloy, titanium-magnesium alloy and carbon fiber pipe type supporting frame is replaced, the overall efficiency of an unmanned aerial vehicle system is improved, and the production and maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned aerial vehicles, and in particular to a method for manufacturing a bamboo unmanned aerial vehicle support frame. Background Art

[0002] The drone support frame is a crucial component of drones. As a critical load-bearing component during takeoff and landing, its performance directly impacts the drone's stability, safety, and overall performance. Currently, common drone support frames on the market are manufactured from materials such as aluminum alloy, titanium-magnesium alloy, and carbon fiber. While these materials meet the performance requirements of drones to a certain extent, they also have some drawbacks. For example, aluminum alloy and titanium-magnesium alloy have high rigidity, making them susceptible to bending due to impact during landing, potentially damaging the aircraft's structure or electronic components. Furthermore, their high weight can affect flight endurance. While carbon fiber composites offer significant lightweighting benefits, they are susceptible to brittle fracture. Once localized damage occurs, the unibody structure requires complete replacement, resulting in high maintenance costs. Furthermore, the manufacturing process for these materials has significant environmental impacts, making waste recycling difficult and inconsistent with green manufacturing requirements.

[0003] In summary, existing drone support frames suffer from systemic shortcomings in impact resistance, maintainability, environmental friendliness, and manufacturing costs. There is an urgent need to develop an alternative solution that balances lightweight, high cushioning, low cost, and easy maintenance. Bamboo, a naturally biodegradable material, offers advantages such as lightness, high strength, and high toughness, while also being inexpensive and environmentally friendly, providing a new technological path to overcome these bottlenecks. In light of this, this application is filed to fully leverage the performance advantages of bamboo and promote the improvement of drone system performance and low-carbon development. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for manufacturing a bamboo drone support frame to solve the problems existing in the prior art, give full play to the performance characteristics, price advantages and environmental friendliness of bamboo compared to existing drone support frame materials (such as aluminum alloy, titanium-magnesium alloy, carbon fiber, etc.), improve the overall performance of the drone system, and reduce production and maintenance costs.

[0005] To achieve the above objectives, the present invention provides a method for manufacturing a bamboo drone support frame, which mainly includes the following steps:

[0006] S1. Select 5-6 year old defect-free bamboo, remove green and yellow bamboo, and separate bamboo fibers to obtain bamboo units of different shapes and sizes;

[0007] S2. For the bamboo units in step S1, use bamboo units with similar or similar shapes and specifications, perform conventional mildew-proof, anti-corrosion, and insect-proof treatment, and control the moisture content to 8% to 12%;

[0008] S3. Apply glue to the bamboo units in step S2 using the device described in "A High-Efficiency Impregnation Device for Bamboo Units" filed simultaneously with this application;

[0009] S4. A modular forming die is made of H13 hot-working die steel (HRC 48-52), wherein the cross-section of the forming cavity of the modular forming die is a rectangular surface or an arcuate surface having one or more combined curvature radii, and the surface roughness Ra is ≤ 3.2 μm; the modular forming die is installed on the equipment described in the "Manufacturing Equipment and Operating Method of a Bamboo Support Frame for Unmanned Aerial Vehicles" filed simultaneously with this application;

[0010] S5. The glue-containing bamboo units prepared in step S3 are stacked and assembled along the fiber direction, and placed into the combined molding die prepared in step S4. According to the operating method described in the "Equipment and Operating Method for Manufacturing Bamboo Support Frame for UAV" filed simultaneously with this application, the movable mold is operated in the axial and radial directions in sequence. The movable mold pressure, temperature, and action time are controlled under the curing temperature and time of the adhesive used and the density requirements of the finished product, and hot pressing is performed.

[0011] S6. Determine whether to subject the combined molding die to forced cooling based on the moisture content of the molded support frame member and its molding productivity requirements, stop circulating the heat transfer medium, perform slow radial pressure relief, rapid radial retraction, and rapid axial retraction of the movable die to the farthest point from the stationary die and the operating side, and then manually or automatically demold the molded bamboo support frame member. The manual or automatic demolding described herein is described in the "Manufacturing Equipment and Operating Method for a Bamboo Support Frame for a UAV," filed concurrently with this application.

[0012] S7. Polish the arc-shaped cross-section bamboo support frame component obtained in step S6, and use CNC or special molding milling equipment to streamline the cross-section of the rectangular cross-section bamboo support frame component obtained in step S6. The surface Ra of the bamboo drone support frame component after polishing and streamlined cross-section processing is ≤6.4μm, and surface protection treatment is performed.

[0013] Preferably, the bamboo unit in step S1 is prepared by cutting the bamboo tube into a fixed length according to the design size of the support frame and then circumferentially splitting it to obtain curved bamboo strips of a certain width, then removing the green bamboo (surface system) and the yellow bamboo (extramedullary tissue), retaining the main body of the middle vascular bundle, and according to the strength and toughness requirements of the final product, processing is performed near the green bamboo side to obtain uniform fine bamboo fibers, or processing is performed near the bamboo wall to the middle bamboo part to obtain standard bamboo pieces with a rectangular cross-section.

[0014] Preferably, in step S3, the mold adopts a layout structure in which a movable mold surrounds a static mold, and the forming sides of the movable mold and the static mold are flat or have a curvature radius matching the arc surface of the bamboo support frame member.

[0015] Preferably, the number of layers in step S5 is calculated based on the density and volume of the bamboo support frame, and the shape and specifications of the bamboo units used; the adhesive curing temperature refers to the temperature of the contact surface between the static mold and the bamboo unit, and the temperature of the dynamic mold cavity is 10 to 15°C higher than the temperature of the static mold cavity.

[0016] Preferably, the manual demolding in step S6 is for bamboo support frame components with circular or arc-shaped cross-sections. After the bamboo support frame components are cooled to below the set value, all the movable modules are first retracted radially and axially to the farthest point from the operating side, and then the static mold block close to the operating side is removed, and the component is removed with the help of a small tool; the automatic demolding in step S6 is for bamboo support frame components with rectangular cross-sections. First, all the movable modules are retracted radially and axially to the farthest point from the operating side, and after the static mold block close to the operating side is removed, the axial drive device is started to retract the remaining static modules away from the operating side to complete demolding and unloading.

[0017] Compared with the prior art, the present invention mainly achieves the following technical effects:

[0018] The present invention provides a method for manufacturing a bamboo drone support frame, which mainly includes bamboo unit processing, bamboo unit pretreatment, mold design and production, bamboo unit gluing, assembly and molding, demolding control, and component post-processing steps. It fully utilizes the fiber structure characteristics and biodegradable material properties of bamboo. The manufactured bamboo support frame has the advantages of lightweight, high energy absorption (good impact toughness), low cost, and environmental friendliness. It can simultaneously solve the problems of rigid impact conduction of metal and brittle fracture of carbon fiber composite materials, providing a green material solution for drone support frames and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a flow chart of the manufacturing method of the bamboo drone support frame described in the present invention;

[0020] Figure 2 This is a real-world application diagram of a bamboo UAV support frame produced by the bamboo UAV support frame manufacturing method described in the present invention. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] This invention provides a method for manufacturing a bamboo support frame for drones. By selecting natural bamboo and combining it with modern processing technology, a drone support frame with excellent mechanical properties, durability, and environmental protection is produced. The following is a detailed description of the specific implementation steps:

[0023] S1. Select 5-6 year old defect-free bamboo, remove green and yellow bamboo, and separate bamboo fibers to obtain bamboo units of different shapes and sizes;

[0024] S2. For the bamboo units in step S1, use bamboo units with similar or similar shapes and specifications, perform conventional mildew-proof, anti-corrosion, and insect-proof treatment, and control the moisture content to 8% to 12%;

[0025] S3. Apply glue to the bamboo units in step S2 using the device described in "A High-Efficiency Impregnation Device for Bamboo Units" filed simultaneously with this application;

[0026] S4. A modular forming die is made of H13 hot-working die steel (HRC 48-52), wherein the cross-section of the forming cavity of the modular forming die is a rectangular surface or an arcuate surface having one or more combined curvature radii, and the surface roughness Ra is ≤ 3.2 μm; the modular forming die is installed on the equipment described in the "Manufacturing Equipment and Operating Method of a Bamboo Support Frame for Unmanned Aerial Vehicles" filed simultaneously with this application;

[0027] S5. The glue-containing bamboo units prepared in step S3 are stacked and assembled along the fiber direction, and placed into the combined molding die prepared in step S4. According to the operating method described in the "Equipment and Operating Method for Manufacturing Bamboo Support Frame for UAV" filed simultaneously with this application, the movable mold is operated in the axial and radial directions in sequence. The movable mold pressure, temperature, and action time are controlled under the curing temperature and time of the adhesive used and the density requirements of the finished product, and hot pressing is performed.

[0028] S6. Determine whether to subject the combined molding die to forced cooling based on the moisture content of the molded support frame member and its molding productivity requirements, stop circulating the heat transfer medium, perform slow radial pressure relief, rapid radial retraction, and rapid axial retraction of the movable die to the farthest point from the stationary die and the operating side, and then manually or automatically demold the molded bamboo support frame member. The manual or automatic demolding described herein is described in the "Manufacturing Equipment and Operating Method for a Bamboo Support Frame for a UAV," filed concurrently with this application.

[0029] S7. Polish the arc-shaped cross-section bamboo support frame component obtained in step S6, and use CNC or special molding milling equipment to streamline the cross-section of the rectangular cross-section bamboo support frame component obtained in step S6. The surface Ra of the bamboo drone support frame component after polishing and streamlined cross-section processing is ≤6.4μm, and surface protection treatment is performed.

[0030] In a preferred embodiment, in step S1, a 5- to 6-year-old defect-free bamboo material with a bamboo wall thickness of 8 to 10 mm is selected to ensure that the bamboo material has sufficient strength and toughness to meet the load requirements of the drone during takeoff and landing; according to the design size of the support frame, a circular saw is used to cut the bamboo tube into a fixed length, and then an automatic bamboo splitting machine is used to obtain curved bamboo strips of a certain width, and the fiber direction of the bamboo strips is its length direction, so as to give full play to the natural fiber mechanical properties of the bamboo; the bamboo green and bamboo yellow are removed by planing and milling, and the middle vascular bundle body is retained. According to the strength and toughness requirements of the final product, the bamboo is processed near the green side to obtain uniform fine bamboo fibers, or the bamboo part near the bamboo wall to the middle is processed to obtain standard bamboo pieces with a rectangular cross-section.

[0031] In a preferred embodiment, the anti-mildew, anti-corrosion and anti-insect treatment in step S2 uses a composite impregnation liquid, which is a mixture of 0.5% copper azole preservative, 1.2% boric acid mildew inhibitor and 0.3% chlorpyrifos insecticide. The impregnation process is carried out at a constant temperature of 60°C and lasts for 2 hours to ensure that the agent fully penetrates into the interior of the bamboo unit, thereby effectively preventing mildew, insect damage and decay.

[0032] In a preferred embodiment, the mold in step S3 adopts a layout structure in which a movable mold surrounds a static mold, and the forming sides of the movable mold and the static mold are flat or have a curvature radius matching the arc surface of the bamboo support frame member.

[0033] In a preferred embodiment, the sizing type in step S4 is a modified phenolic resin adhesive with a solid content of 25% and an impregnation amount (referring to the solid amount) controlled at 75 to 90 g / m 2 The impregnated bamboo unit is dried to a moisture content of less than 16% in preparation for subsequent assembly.

[0034] In a preferred embodiment, the number of layers in step S5 is calculated based on the density and volume of the bamboo support frame, as well as the shape and specifications of the bamboo units used; the adhesive curing temperature refers to the temperature of the contact surface between the static mold and the bamboo unit, and the temperature of the dynamic mold cavity is 10 to 15°C higher than the temperature of the static mold cavity.

[0035] In a preferred embodiment, the manual demolding in step S6 is for bamboo support frame components with circular or arc-shaped cross-sections. After the bamboo support frame components are cooled to below the set value, all the movable modules are first retracted radially and axially to the farthest point from the operating side, and then the static mold block close to the operating side is removed, and the component is removed with the help of a small tool; the automatic demolding in step S6 is for bamboo support frame components with rectangular cross-sections. First, all the movable modules are retracted radially and axially to the farthest point from the operating side, and then the static mold block close to the operating side is removed, and then the axial drive device is started to retract the remaining static modules away from the operating side, completing demolding and unloading, thereby avoiding cracks in the components due to forced disassembly.

[0036] In a preferred embodiment, the polishing treatment in step S7 uses semi-automatic special-shaped polishing equipment or automated rotary polishing equipment to remove surface burrs and processing marks; the surface protection treatment is to use a painting equipment to spray water-based UV paint on the surface of the bamboo support frame that has completed hole groove processing, polishing and cross-section processing to enhance weather resistance during use.

[0037] The bamboo drone support frame produced through the above steps fully utilizes the natural advantages of bamboo and combines modern processing technology to achieve a lightweight design while also having excellent mechanical properties and environmental protection characteristics. It is suitable for the support frame needs of various types of drones.

[0038] Adaptive changes based on actual needs are all within the scope of protection of the present invention.

[0039] It should be noted that it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be encompassed within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0040] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A method for manufacturing a bamboo drone support frame, characterized in that: The following steps are involved: S1. Select 5-6 year old defect-free bamboo, remove green and yellow bamboo, and separate bamboo fibers to obtain bamboo units of different shapes and sizes; S2. For the bamboo units in step S1, use bamboo units with similar or similar shapes and specifications, perform conventional mildew-proof, anti-corrosion, and insect-proof treatment, and control the moisture content to 8% to 12%; S3. Apply glue to the bamboo units in step S2 using the device described in "A High-Efficiency Impregnation Device for Bamboo Units" filed simultaneously with this application; S4. A modular forming mold is made of H13 hot-working die steel (HRC 48-52), wherein the cross-section of the forming cavity of the modular forming mold is a rectangular surface or an arc-shaped surface having one or more combined curvature radii, and the surface roughness Ra is ≤ 3.2 μm; the modular forming mold is the device described in the "Manufacturing Equipment and Operating Method of a Bamboo Support Frame for Unmanned Aerial Vehicles" filed simultaneously with this application; S5. The glue-containing bamboo units prepared in step S3 are stacked and assembled along the fiber direction, and placed into the combined molding die prepared in step S4. According to the operating method described in the "Equipment and Operating Method for Manufacturing Bamboo Support Frame for UAV" filed simultaneously with this application, the movable mold is operated in the axial and radial directions in sequence. The movable mold pressure, temperature, and action time are controlled under the curing temperature and time of the adhesive used and the density requirements of the finished product, and hot pressing is performed. S6. Determine whether to subject the combined molding die to forced cooling based on the moisture content of the molded support frame member and its molding productivity requirements, stop circulating the heat transfer medium, perform slow radial pressure relief, rapid radial retraction, and rapid axial retraction of the movable die to the farthest point from the stationary die and the operating side, and then manually or automatically demold the molded bamboo support frame member. The manual or automatic demolding described herein is described in the "Manufacturing Equipment and Operating Method for a Bamboo Support Frame for a UAV," filed concurrently with this application. S7. Polish the arc-shaped cross-section bamboo support frame component obtained in step S6, and use CNC or special molding milling equipment to streamline the cross-section of the rectangular cross-section bamboo support frame component obtained in step S6. The surface Ra of the bamboo drone support frame component after polishing and streamlined cross-section processing is ≤6.4μm, and surface protection treatment is performed.

2. The method according to claim 1, characterized in that The bamboo units obtained in step S1 can be fine bamboo filaments or standard bamboo pieces. According to the strength and toughness requirements of the final product, bamboo filaments close to the green side of the bamboo or standard bamboo pieces close to the bamboo wall to the middle of the bamboo are selected.

3. The method according to claim 1, characterized in that In step S3, the mold adopts a layout structure in which a movable mold surrounds a static mold, and the forming sides of the movable mold and the static mold are flat or have a curvature radius matching the arc surface of the bamboo support frame member.

4. The method according to claim 1, wherein The number of layers in step S5 is calculated based on the density and volume of the bamboo support frame, as well as the shape and specifications of the bamboo units used; the adhesive curing temperature refers to the temperature of the contact surface between the static mold and the bamboo unit, and the temperature of the dynamic mold cavity is 10 to 15°C higher than the temperature of the static mold cavity.

5. The method according to claim 1, wherein In step S6, whether to subject the mold to forced cooling is determined based on the moisture content of the support frame member after molding and its molding productivity requirements. This is to ensure that the bamboo unit after gluing does not experience bubbling or damage to the bonding surface due to excessive internal steam pressure during the pressure relief process after molding. The automatic demolding must be performed after removing the static mold block near the operating side.

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