A double-arrow-shaped metamaterial corrugated strip multi-step semi-automatic forming platform

Abstract

The utility model provides a kind of double-arrow-shaped metamaterial corrugated strip multi-step semi-automated forming platform, the utility model places initial rectangular corrugated strip in forming area first, through the folding mechanism and pressure block propulsion mechanism with spatial phase difference distribution characteristics, combined with multistage progressive extrusion path planning strategy, realize double-arrow-shaped metamaterial corrugated strip layer-by-layer cumulative forming under the dynamic load exerted by electric control system, and the forming angle and precision of material after forming are guaranteed by fine adjustment sliding table and screw clamp, after forming is completed, pressure maintaining treatment is carried out by the pressure maintaining force of electric cylinder, material springback is reduced, and finally high-precision double-arrow-shaped metamaterial corrugated strip is obtained.

Description

Technical Field

[0001] This invention proposes a multi-step semi-automatic forming platform for double-arrow-shaped metamaterial corrugated strips, which relates to the fields of metal metamaterials and electronic control automation. Background Technology

[0002] Negative Poisson's ratio metamaterials are special materials that exhibit increased lateral dimensions (expansion) under tension and decreased lateral dimensions (contraction) under compression, unlike traditional positive Poisson's ratio materials (where Poisson's ratio is positive). Their Poisson's ratio is defined as the negative ratio of lateral strain to longitudinal strain.

[0003] It expands laterally under uniaxial tension and contracts laterally under compression, opposite to the deformation direction of conventional materials (Poisson's ratio > 0). This characteristic stems from its special microstructure (such as concave honeycomb, rigid bodies of rotation, chiral structures, etc.), achieved through structural deformation rather than the material's inherent properties. As the absolute value of the negative Poisson's ratio increases, the indentation resistance approaches infinity, causing the material to concentrate in the load area under impact, resulting in a hardness far exceeding that of traditional materials. The porous structure absorbs energy through cell deformation during compression, increasing dynamic load-bearing capacity by more than 30% compared to traditional honeycomb structures, making it suitable for cushioning and impact protection designs. Some materials possess shape memory effects or controllable thermal expansion, making them suitable for applications such as smart sensors and deployable antennas.

[0004] The double-arrow negative Poisson's ratio material is composed of periodically arranged arrow-shaped frame units. The Poisson's ratio and stiffness of the material can be controlled by adjusting the cell parameters (such as the included angle and wall thickness).

[0005] There are currently few mature forming methods for this shape, which can be roughly divided into four categories: The first category is 3D printing additive manufacturing. Metal 3D printing relies on high-purity metal powders (such as titanium alloys and stainless steel), and its production cost is significantly higher than that of traditional materials. The powder needs to be finely processed to ensure particle uniformity, which may result in a price that is several times higher than that of traditional materials. Metal 3D printers themselves are expensive and require high-precision laser sintering or electron beam melting technology. In addition, the complex geometric design of negative Poisson's ratio structures (such as multi-scale pores) requires multiple iterations of printing and verification, which increases the R&D cost. The surface of metal printed parts is usually rough (interlayer stacking effect), which requires post-processing optimization through machining, heat treatment and other processes. For the fine features of negative Poisson's ratio structures (such as the multi-scale pores of nanofiber aerogels), post-processing may destroy the microscopic topology and affect functional properties.

[0006] The second type of method is traditional subtractive manufacturing, such as cutting and etching. Due to the small concave arrow angle and plate thickness of the formed shape, traditional subtractive manufacturing is difficult to guarantee the forming and produces a lot of waste. Subtractive manufacturing introduces pores or hinge structures (such as double arrow structures) into the material through cutting or etching, which leads to the destruction of material continuity and is relatively inefficient.

[0007] The third type is mechanical bending. Although this method is economically efficient and does not produce much waste, it can cause problems such as difficulty in positioning and poor forming continuity due to the extremely thin metal foil. It can even lead to punch interference.

[0008] The fourth type is manual step-by-step pressing and forming. Although this method does not waste materials or produce much waste, it cannot guarantee the feed rate and the flatness and parallelism of the material surface. Its demolding or core-pulling methods are also more difficult, resulting in great deformation of the material after forming. Utility Model Content

[0009] In view of this, in order to fill the gaps and deficiencies in the existing technology, this utility model proposes a multi-step semi-automatic forming platform for double-arrow-shaped metamaterial corrugated strips.

[0010] This utility model proposes a multi-step semi-automatic forming platform for double-arrow-shaped metamaterial corrugated strips, including the following:

[0011] A multi-step semi-automatic forming platform for a double-arrow-shaped metamaterial corrugated strip is characterized by comprising an electric cylinder, a propulsion plate, a clamp, a linear guide slider, a moving plate, a fine-tuning slide, a right moving stage, a fixed plate, an electrically controlled lifting stage, a right support platform for the folding block, a left support platform for the folding block, a left moving stage, a first pad, a left fixed support, a guide column, a side pressure block, a folding block, an initial rectangular strip, a second pad, a lead screw clamp holder, a lead screw clamp, a front support for the electric cylinder, a base, and a rear support for the electric cylinder.

[0012] The aforementioned multi-step semi-automatic forming platform for double-arrow-shaped metamaterial corrugated strips includes an electrically controlled cylinder propulsion and lifting section, a side-pressure block side-pressure forming section, and a folding block progressive extrusion forming section. The platform uses the side-pressure block side-pressure forming section to laterally push and form concave arrows, and the folding block progressive extrusion forming section forms an embedded structure with the side-pressure block side-pressure forming section. Combined with a multi-level progressive extrusion path planning strategy, the platform achieves the forming of double-arrow-shaped metamaterial corrugated strips under the dynamic load applied by the electrically controlled cylinder propulsion and lifting section.

[0013] Furthermore, the electrically controlled cylinder propulsion and lifting part includes an electric cylinder, an electrically controlled lifting platform, a left-side fixed support, a front support for the electric cylinder, a rear support for the electric cylinder, and a base.

[0014] Furthermore, the electric lifting platform, the left fixed support, the front support of the electric cylinder, and the rear support of the electric cylinder are all fixedly connected to the base with bolts and fasteners, and the front support of the electric cylinder and the rear support of the electric cylinder are fixed to the electric cylinder with bolts and nuts.

[0015] Furthermore, the side-pressing forming part of the side-pressing block includes a clamp, a linear guide slider, a moving plate, a fine-tuning slide, a right moving table, a fixed plate, an electrically controlled lifting table, a left moving table, a side-pressing block, and a lead screw clamp holder.

[0016] Furthermore, the clamp and the fixed plate are connected by bolt fasteners, the fixed plate and the electrically controlled lifting platform are connected by bolt fasteners, the clamp and the moving plate are fixedly connected by their own threaded holes and screws and nuts, the linear guide slider is connected to the fixed plate by bolt fasteners, and the linear guide slider is connected to the moving plate by bolts; wherein the moving plate translates along the linear guide slider under the action of the clamp.

[0017] Furthermore, the fine-tuning slide is fixed to the moving plate by bolts through its own threaded holes. The left fine-tuning slide is fixed to the second pad by bolts through its own threaded holes. The right and left moving stages are fixed to the fine-tuning slides by bolts. Both the right and left moving stages have side pressure blocks constrained by guide posts and planes. The guide posts in the right and left moving stages are fixed to the right and left moving stages by bolt fasteners. The lead screw clamp holders are all connected to the moving plate by bolt fasteners, and the lead screw clamp holders are connected to the first pad by bolt fasteners.

[0018] Furthermore, the right and left moving stages move under the action of the fine-tuning slide, and the side pressing block is side-pressed and shaped under the action of the right and left moving stages. It can also reciprocate along the guide column under the guidance of the internal guide column.

[0019] Furthermore, the folding block progressive extrusion forming part includes a folding block right support platform, a folding block left support platform, a guide column, and a folding block.

[0020] Furthermore, the left support platform of the folding block is connected to the pad plate by bolt fasteners, and the folding block is positioned by the right support platform of the folding block, one side of the left support platform of the folding block and the guide post, so that the folding block can reciprocate along the direction of the guide post.

[0021] This utility model has the following advantages:

[0022] 1) This invention addresses the problems of high cost and poor forming quality inherent in the first type of method (additive manufacturing), particularly for ultra-thin metal foils, where additive manufacturing is challenging and secondary processing of the material after forming is extremely difficult. This invention proposes a forming method based on a linked folding module. Through an innovative design of a folding mechanism with spatial phase difference distribution characteristics, it works in conjunction with side pressure blocks to laterally push and form concave arrows. Simultaneously, the folding block and side pressure blocks form an embedded structure. Combined with a multi-level progressive extrusion path planning strategy, under the dynamic load applied by the electronic control system, the double-arrow-shaped metamaterial corrugated strip is formed layer by layer. This design employs electrolytic polishing to finish the surfaces of the folding block and side pressure blocks, combined with substrate surface pretreatment, ensuring good surface smoothness before forming. Furthermore, through the synergistic optimization design of the forming path and surface quality, the final formed part meets the surface finish requirements of the corrugated strip, thus eliminating the time-consuming secondary processing in traditional processes, improving production efficiency, saving manufacturing costs, and achieving good forming quality.

[0023] 2) This design solves the problems of low production efficiency, excessive waste of raw materials, and high economic costs in the second type of method (subtractive manufacturing). The device designed in this paper is simple to operate, requires almost no waste of raw materials, and has low processing costs. It uses automated control to perform a progressive pressing process, thereby greatly improving production efficiency.

[0024] 3) It solves the interference problem in the third type of method (mechanical bending). Through the mutual cooperation between the folding blocks and the embedding method between the side pressure block and the folding block, there is no interference after the folding block and the side pressure block are adjusted, and it is easy to demold, thereby improving production efficiency.

[0025] 4) This design solves the problems of large fluctuations in forming rate and poor quality consistency in the fourth type (manual pressing). The forming mechanism designed in this paper uses an electronic control system (electric cylinder, sensor) to collect contact pressure and displacement data streams in real time and use external commands to make the electric cylinder advance speed adjust in the opposite direction according to the dynamic changes in forming resistance. This solves the problem of material plastic instability caused by high strain rate unsteady extrusion in traditional manual pressing process.

[0026] 5) This design effectively ensures the angle of the double arrows in the formed material. This design utilizes the cooperation of the fine-tuning slide and the side pressure block to ensure the angle of the concave arrows in the material, and uses a lead screw clamp for secondary clamping to better ensure its forming angle and forming accuracy.

[0027] 6) The demolding method designed in this project is relatively simple and automated. Addressing the problems of difficult demolding, demolding interference, and low demolding efficiency, this design employs a small electrically controlled lifting platform for demolding. Specifically, the platform precisely lifts one side of the folding block and the pressure measuring block, effectively solving the problems of difficult operation and significant deformation during demolding, thus significantly improving demolding efficiency and quality. Attached Figure Description

[0028] Figure 1 This is a three-dimensional schematic diagram of a multi-step semi-automated forming platform for double-arrow-shaped metamaterial corrugated strips.

[0029] Figure 2 This is a schematic diagram of a local area of ​​the forming platform before forming.

[0030] Figure 3 This is a schematic diagram of a local area after the forming platform is completed.

[0031] Figure 4 This is a schematic diagram of the double-arrow-shaped metamaterial corrugated strip after forming.

[0032] In the diagram, 1-electric cylinder, 2-propulsion plate, 3-clamp, 4-linear guide rail and slider, 5-moving plate, 6-fine-tuning slide, 7-right moving stage, 8-fixed plate, 9-electrically controlled lifting stage, 10-right support platform of folding block, 11-left support platform of folding block, 12-left moving stage, 13-pad one, 14-left fixed support, 15-guide column, 16-side pressure block, 17-folding block, 18-initial rectangular strip, 19-pad two, 20-screw clamp holder, 21-screw clamp, 22-front support of electric cylinder, 23-base, 24-rear support of electric cylinder. Detailed Implementation

[0033] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings.

[0034] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application; as used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise; furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] A multi-step semi-automatic forming platform for a double-arrow-shaped metamaterial corrugated strip includes an electric cylinder 1, a push plate 2, a clamp 3, a linear guide slider 4, a moving plate 5, a fine-tuning slide 6, a right moving stage 7, a fixed plate 8, an electrically controlled lifting stage 9, a right support platform for the folding block 10, a left support platform for the folding block 11, a left moving stage 12, a pad 13, a left fixed support 14, a guide column 15, a side pressure block 16, a folding block 17, an initial rectangular strip 18, a pad 2 19, a lead screw clamp holder 20, a lead screw clamp 21, a front support for the electric cylinder 22, a base 23, and a rear support for the electric cylinder 24.

[0037] The aforementioned multi-step semi-automatic forming platform for double-arrow-shaped metamaterial corrugated strips includes an electrically controlled cylinder propulsion and lifting section, a side-pressure block side-pressure forming section, and a folding block progressive extrusion forming section. The platform uses the side-pressure block side-pressure forming section to laterally push and form concave arrows, and the folding block progressive extrusion forming section forms an embedded structure with the side-pressure block side-pressure forming section. Combined with a multi-level progressive extrusion path planning strategy, the platform achieves the forming of double-arrow-shaped metamaterial corrugated strips under the dynamic load applied by the electrically controlled cylinder propulsion and lifting section.

[0038] In a preferred embodiment of the present invention, the electrically controlled cylinder propulsion and lifting part includes an electric cylinder 1, an electrically controlled lifting platform 9, a left fixed support 14, a front support 22 for the electric cylinder, a rear support 24 for the electric cylinder, and a base 23.

[0039] In a preferred embodiment of this utility model, the electrically controlled lifting platform 9, the left fixed support 14, the electric cylinder front support 22, and the electric cylinder rear support 24 are all fixedly connected to the base 23 with bolts and fasteners, and the electric cylinder front support 22 and the electric cylinder rear support 24 are fixed to the electric cylinder 1 with bolts and nuts.

[0040] In a preferred embodiment of the present invention, the side pressing block side pressing forming part includes a clamp 3, a linear guide slider 4, a moving plate 5, a fine-tuning slide 6, a right moving table 7, a fixed plate 8, an electrically controlled lifting table 9, a left moving table 12, a side pressing block 16, and a lead screw clamp fixer 20.

[0041] In a preferred embodiment of this utility model, the clamp 3 and the fixed plate 8 are connected by bolt fasteners, the fixed plate 8 and the electrically controlled lifting platform 9 are connected by bolt fasteners, the clamp 3 and the moving plate 5 are fixedly connected by their own threaded holes and screws and nuts, the linear guide slider 4 is connected to the fixed plate 8 by bolt fasteners, and the linear guide slider 4 is connected to the moving plate 5 by bolts; wherein the moving plate 5 translates along the linear guide slider 4 under the action of the clamp 3.

[0042] In a preferred embodiment of this utility model, the fine-tuning slide 6 is fixed to the moving plate 5 by bolts through its own threaded hole. The left fine-tuning slide is fixed to the pad 19 by bolts through its own threaded hole. The right moving platform 7 and the left moving platform 12 are fixed to the fine-tuning slide 6 by bolts. Both the right moving platform 7 and the left moving platform 12 have side pressure blocks 16 constrained by guide posts and planes. The guide posts in the right moving platform 7 and the left moving platform 12 are fixed in the right moving platform 7 and the left moving platform 12 by bolt fasteners. The lead screw clamp retainer 20 is connected to the moving plate 5 by bolt fasteners, and the lead screw clamp retainer is connected to the pad 13 by bolt fasteners.

[0043] In a preferred embodiment of this utility model, the right moving stage 7 and the left moving stage 12 are moved under the action of the fine-tuning slide 6. The side pressing block 16 is side-pressed and shaped under the action of the right moving stage 7 and the left moving stage 12, and can reciprocate along the guide column under the guidance of the internal guide column.

[0044] In a preferred embodiment of the present invention, the folding block progressive extrusion forming part includes a folding block right support platform 10, a folding block left support platform 11, a pad 13, a guide post 15, and a folding block 17.

[0045] In a preferred embodiment of the present invention, the left support platform 11 of the folding block is connected to the pad 13 by bolt fasteners, and the folding block 17 is positioned by one side of the right support platform 10 of the folding block, one side of the left support platform 11 of the folding block and the guide post 15, so that the folding block can reciprocate along the direction of the guide post 15.

[0046] In a preferred embodiment of this utility model, taking the fabrication of a double-arrow-shaped metamaterial corrugated strip with a thickness of 0.1 mm as an example, a working process of a multi-step semi-automatic forming platform for a double-arrow-shaped metamaterial corrugated strip is provided, including the following:

[0047] Step 1: Cross and separate the folding block 17 and the side pressure block 16 and feed the material, so that the rectangular strip 18 is placed on top of the folding block 17, and lubricate the initial material;

[0048] Step 2: Use clamp 3 to push the moving plate 5, so that the moving plate 5 moves along the linear guide rail to find the working position of the folding block 17 and the side pressure block 16;

[0049] Step 3: Use the fine-tuning slide 6 to make the side pressure block 16 and the folding block 17 fit together to form a concave arrow shape, and the screw clamp 21 can be used for secondary fixation and side pressure.

[0050] Step 4: The electric cylinder 1 and the push plate 2 are used to gradually push and press. The optimal pushing force and pushing speed are set. The folding block 17 and the side pressing block 16 are progressively formed along the direction of the guide column 15 under the action of the push plate 2 until the folding block contacts the end of the left and right support platforms, and then the pressure holding begins.

[0051] Step 5: After the pressure holding is completed, the electric cylinder is withdrawn, the lead screw clamp is released, the moving plate 5 is pushed out along the direction of the linear guide rail using clamp 3, and the electric cylinder is reset. Finally, the corrugated belt is demolded and removed using the electrically controlled lifting platform. At this point, the double-arrow-shaped metamaterial corrugated belt is prepared.

[0052] The above are preferred embodiments of this utility model. Any changes made to the technical solution of this utility model that do not exceed the scope of the technical solution of this utility model shall be protected within the scope of this utility model.

Claims

1. A multi-step semi-automatic forming platform for double-arrow-shaped metamaterial corrugated strips, characterized in that, Includes electric cylinder, push plate, clamp, linear guide slider, moving plate, fine-tuning slide, right moving table, fixed plate, electrically controlled lifting platform, right support platform of folding block, left support platform of folding block, left moving table, pad 1, left fixed support, guide column, side pressure block, folding block, initial rectangular strip, pad 2, screw clamp holder, screw clamp, front support of electric cylinder, base, and rear support of electric cylinder; The aforementioned multi-step semi-automatic forming platform for a double-arrow-shaped metamaterial corrugated belt includes an electrically controlled cylinder propulsion and lifting section, a side-pressure block side-pressure forming section, and a folding block progressive extrusion forming section. The platform uses the side-pressure block side-pressure forming section to laterally push and form concave arrows, and the folding block progressive extrusion forming section forms an embedded structure with the side-pressure block side-pressure forming section. Under the dynamic load applied by the electrically controlled cylinder propulsion and lifting section, the double-arrow-shaped metamaterial corrugated belt is formed.

2. The multi-step semi-automatic forming platform for double-arrow-shaped metamaterial corrugated belts according to claim 1, characterized in that, The electric cylinder propulsion and lifting part includes an electric cylinder, an electric lifting platform, a left fixed support, a front support for the electric cylinder, a rear support for the electric cylinder, and a base.

3. The multi-step semi-automatic forming platform for a double-arrow-shaped metamaterial corrugated belt according to claim 2, characterized in that, The electric lifting platform, the left fixed support, the front support of the electric cylinder, and the rear support of the electric cylinder are all fixedly connected to the base with bolts and fasteners. The front support of the electric cylinder and the rear support of the electric cylinder are fixed to the electric cylinder with bolts and nuts.

4. The multi-step semi-automatic forming platform for double-arrow-shaped metamaterial corrugated strips according to claim 1, characterized in that, The side-pressing forming part of the side-pressing block includes a clamp, a linear guide slider, a moving plate, a fine-tuning slide, a right moving table, a fixed plate, an electrically controlled lifting table, a left moving table, a side-pressing block, and a lead screw clamp holder.

5. The multi-step semi-automatic forming platform for a double-arrow-shaped metamaterial corrugated belt according to claim 4, characterized in that, The clamp and the fixed plate are connected by bolt fasteners, the fixed plate and the electrically controlled lifting platform are connected by bolt fasteners, the clamp and the moving plate are fixedly connected by their own threaded holes and screws and nuts, the linear guide slider is connected to the fixed plate by bolt fasteners, and the linear guide slider is connected to the moving plate by bolts; wherein the moving plate moves along the linear guide slider under the action of the clamp.

6. The multi-step semi-automatic forming platform for a double-arrow-shaped metamaterial corrugated belt according to claim 4, characterized in that, The fine-tuning slide is fixed to the moving plate by bolts through its own threaded hole. The left fine-tuning slide is fixed to the pad plate II by bolts through its own threaded hole. The right and left moving stages are fixed to the fine-tuning slide by bolts. Both the right and left moving stages have side pressure blocks constrained by guide posts and planes. The guide posts in the right and left moving stages are fixed to the right and left moving stages by bolt fasteners. The aforementioned lead screw clamp holders are all connected to the moving plate via bolt fasteners, and the aforementioned lead screw clamp holders are connected to the pad plate via bolt fasteners.

7. The multi-step semi-automatic forming platform for a double-arrow-shaped metamaterial corrugated belt according to claim 6, characterized in that, The right and left moving stages move under the action of the fine-tuning slide, and the side pressing block is side-pressed and shaped under the action of the right and left moving stages. It can also reciprocate along the guide column under the guidance of the internal guide column.

8. The multi-step semi-automatic forming platform for double-arrow-shaped metamaterial corrugated strips according to claim 1, characterized in that, The folding block progressive extrusion forming section includes a folding block right support platform, a folding block left support platform, a guide column, and a folding block.

9. A multi-step semi-automatic forming platform for a double-arrow-shaped metamaterial corrugated belt according to claim 8, characterized in that, The left support platform of the folding block is connected to the pad plate by bolt fasteners. The folding block is positioned by the right support platform of the folding block, one side of the left support platform of the folding block and the guide post, so that the folding block can reciprocate along the direction of the guide post.

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