Self-adaptive military shoe sole manufacturing method based on shape memory alloy

Abstract

The invention discloses a self-adaptive military shoe sole manufacturing method based on shape memory alloy. According to the method, shape memory alloy (such as nickel-titanium alloy) is used as a main material of the shoe sole, so that self-adaptive deformation of the shoe sole under different temperature and pressure conditions is realized. The method comprises the following specific steps: performing the shape memory alloy, performing heat treatment, compounding with a base material, and automatically assembling. The method not only improves the wear resistance and impact resistance of the sole, but also can provide optimal support and comfort in different environments. And through the automatic production line, the consistency of the production efficiency and the product quality is ensured. The method is suitable for manufacturing high-performance military shoes, and is particularly suitable for special troops needing to work under extreme conditions.

Description

Technical Field

[0001] The invention relates to the technical field of footwear manufacturing, and in particular to a method for manufacturing military shoe soles. Background Art

[0002] In military and special operations environments, the performance requirements for shoes are very high, including wear resistance, waterproofness, breathability, impact resistance, and the ability to adapt to various extreme environments. At present, the sole manufacturing process of military shoes mainly includes the following aspects: Material selection: Traditional military soles are usually made of rubber, polyurethane (PU), ethylene-vinyl acetate copolymer (EVA), etc. These materials have certain wear resistance and impact resistance, which can meet basic protection needs.

[0003] In order to improve wear resistance and impact resistance, reinforcing materials such as carbon fiber and Kevlar fiber are sometimes added to the soles.

[0004] Molding process: Injection molding: Molten plastic material is injected into a mold and formed into the sole after cooling. This method is suitable for mass production, but the mold cost is higher.

[0005] Compression molding: The preheated material is placed in a mold and formed by high-pressure compression. This method is suitable for soles with complex shapes, but the production efficiency is low.

[0006] Foaming: The material is expanded by a chemical foaming agent to form a lightweight and elastic sole. This method is suitable for soles that require lightweight and cushioning properties.

[0007] Post-processing: The formed soles usually need to be polished, trimmed and other post-processing to ensure that the surface is smooth and free of burrs.

[0008] Sometimes surface treatment is required, such as painting, coating, etc., to improve wear resistance and aesthetics.

[0009] Performance Test: In order to ensure the quality and performance of the sole, a series of performance tests are usually carried out, including abrasion resistance test, impact resistance test, bending fatigue test, etc. Commonly used test standards include ISO 13287 (abrasion resistance test), ISO ¾5 (impact resistance test) and ISO 17707 (bending fatigue test).

[0010] Although the existing military sole manufacturing process can meet the basic performance requirements to a certain extent, it still has the following shortcomings and needs to be improved through new technologies: Insufficient wear and impact resistance: Traditional sole materials are prone to wear after long-term use, especially in harsh environments such as deserts, jungles or battlefields.

[0011] In high-impact environments, traditional sole materials have difficulty providing adequate cushioning and protection, which may cause injuries to the wearer's feet.

[0012] Lack of adaptability: Traditional sole materials are unable to automatically adjust their shape and performance according to changes in ambient temperature and pressure, causing wearers to feel uncomfortable in different environments.

[0013] Failure to provide optimal support and comfort can easily lead to foot fatigue and discomfort, especially when walking or standing for long periods of time. Summary of the invention

[0014] Based on the above problems, the purpose of the present invention is to provide a method for manufacturing an adaptive military shoe sole based on shape memory alloy to solve the problems of insufficient wear resistance and impact resistance, insufficient adaptability and poor comfort of military shoe soles in the prior art.

[0015] This method uses shape memory alloys (such as nickel-titanium alloys) as the main material of the sole to achieve adaptive deformation of the sole under different temperature and pressure conditions. The specific steps include: Materials preparation: Shape memory alloys (such as nickel-titanium alloys) are selected as the main material of the sole.

[0016] High-performance substrates such as aramid fibers, ultra-high molecular weight polyethylene (UHMWPE) and polyamide fibers are selected to enhance the mechanical properties of the sole.

[0017] Polyurethane (PU) or other suitable adhesive is selected to compound the shape memory alloy with the substrate.

[0018] Preforming of shape memory alloys: Design and modeling: According to the design requirements of the sole, three-dimensional modeling is performed using computer-aided design (CAD) software to determine the shape and size of the shape memory alloy.

[0019] Cutting and forming: Cut the shape memory alloy sheet or rod into the required shape, and then pre-form it through stamping, hot forming and other methods to obtain the preliminary sole shape.

[0020] Heat Treatment: Annealing: The preformed shape memory alloy parts are annealed to eliminate internal stress and make them have good shape memory properties. The annealing temperature is usually set between 400°C and 500°C, and the time is 30 minutes to 60 minutes.

[0021] Shape memory training: Shape memory alloys are trained to restore a predetermined shape at a specific temperature through heating and cooling cycles. The training temperature is usually set near the phase transition temperature of the shape memory alloy, such as the phase transition temperature of nickel-titanium alloys, which is about 100°C.

[0022] Composite with substrate: Surface treatment: Clean and activate the surface of shape memory alloy and substrate to improve the bonding effect of adhesive.

[0023] Adhesive coating: evenly coat polyurethane or other adhesive on the contact surface of the shape memory alloy and the substrate.

[0024] Composite treatment: The shape memory alloy coated with adhesive is composited with the substrate and firmly bonded by pressurization and heating. The composite temperature is usually set within the curing temperature range of the adhesive, such as 100°C to 150°C, the pressure is 0.5 MPa to 1.5 MPa, and the time is 30 minutes to 60 minutes.

[0025] Automated assembly: Component preparation: Prepare the composite sole components and other shoe components (such as uppers, linings, etc.).

[0026] Automated assembly: Utilize automated production lines to perform precise bonding, stitching, and pressing through robotic arms and automated equipment to ensure tight connections between components.

[0027] Quality inspection: The assembled soles are inspected for size, appearance and performance through automated testing equipment to ensure that product quality meets design requirements.

[0028] Performance Test: Abrasion resistance test: Use Taber abrasion tester to test the abrasion resistance of the sole to ensure its abrasion resistance in different environments.

[0029] Impact resistance test: The soles are tested for impact resistance using impact testing equipment to ensure their cushioning and protection performance in high-impact environments.

[0030] Adaptability test: The sole is tested for adaptability in a temperature cycle chamber to ensure its ability to deform adaptively under different temperature and pressure conditions.

[0031] Quality Inspection: Visual inspection: Perform a visual inspection of the sole to ensure there are no obvious defects or flaws.

[0032] Size inspection: Use size inspection equipment to inspect the size of the sole to ensure it meets the design requirements.

[0033] Record and traceability: The quality control system records the production information and test results of each batch of soles to ensure that product quality is traceable.

[0034] Packaging and Delivery: Packaging: The finished products that have passed the inspection shall be packed individually or in pairs, and packed in moisture-proof bags or sealed bags to prevent moisture and contamination.

[0035] Label: Mark product information on the packaging, including model, specifications, production date and batch number.

[0036] Delivery: Through the logistics system, the shoes are delivered to customers safely and quickly.

[0037] In summary, the present invention significantly improves the wear resistance and impact resistance of the sole by using shape memory alloy, so that it can maintain good performance even in harsh environments. The adaptive characteristics of shape memory alloy enable the sole to automatically adjust its shape and performance under different temperature and pressure conditions, providing optimal support and comfort, reducing foot fatigue and discomfort. In addition, the method adopts an automated production line and an optimized process flow, which improves production efficiency, reduces production costs, and ensures consistency in product quality. DETAILED DESCRIPTION

[0038] In a specific embodiment, suppose we need to manufacture a batch of high-performance adaptive military soles for a special forces unit. The following are the detailed implementation steps: Materials preparation: Nickel-titanium alloy was selected as the main material of the sole.

[0039] Aramid fiber was selected as a high-performance substrate to enhance the mechanical properties of the sole.

[0040] Polyurethane (PU) was selected as the adhesive for composite NiTi alloy with aramid fiber.

[0041] Preforming of shape memory alloys: Design and Modeling: Computer-aided design (CAD) software and Autodesk Fusion 360 were used for 3D modeling to determine the shape and size of the Nitinol alloy.

[0042] Cutting and forming: The nickel-titanium alloy sheet is cut into the required shape and then preformed by a thermoforming method to obtain a preliminary sole shape.

[0043] Heat Treatment: Annealing treatment: The preformed nickel-titanium alloy component is placed in a high-temperature furnace for annealing treatment, and the annealing temperature is set to 450°C for 45 minutes.

[0044] Shape memory training: Shape memory training of NiTi alloy was performed through heating and cooling cycles. The training temperature was set at 100°C and the number of cycles was 5 times.

[0045] Composite with substrate: Surface treatment: Clean and activate the surface of NiTi alloy and aramid fiber.

[0046] Adhesive coating: The polyurethane adhesive is evenly coated on the contact surface of the nickel-titanium alloy and the aramid fiber.

[0047] Composite treatment: The NiTi alloy coated with adhesive was composited with the aramid fiber, and the composite temperature was set to 120°C, the pressure was 1.0 MPa, and the time was 45 minutes.

[0048] Automated assembly: Component preparation: Prepare the composite sole component and other shoe components.

[0049] Automated assembly: Utilize automated production lines to perform precise bonding, stitching, and pressing through robotic arms and automated equipment to ensure tight connections between components.

[0050] Quality inspection: The assembled soles are inspected for size, appearance and performance through automated testing equipment to ensure that product quality meets design requirements.

[0051] Performance Test: Abrasion resistance test: Use Taber abrasion tester to test the abrasion resistance of the sole to ensure its abrasion resistance in different environments.

[0052] Impact resistance test: The soles are tested for impact resistance using impact testing equipment to ensure their cushioning and protection performance in high-impact environments.

[0053] Adaptability test: The sole is tested for adaptability in a temperature cycle chamber to ensure its ability to deform adaptively under different temperature and pressure conditions.

[0054] Quality Inspection: Visual inspection: Perform a visual inspection of the sole to ensure there are no obvious defects or flaws.

[0055] Size inspection: Use size inspection equipment to inspect the size of the sole to ensure it meets the design requirements.

[0056] Record and traceability: The quality control system records the production information and test results of each batch of soles to ensure that product quality is traceable.

[0057] Packaging and Delivery: Packaging: The finished products that have passed the inspection will be packed individually or in pairs, and packed in moisture-proof bags to prevent moisture and contamination.

[0058] Label: Mark product information on the packaging, including model, specifications, production date and batch number.

[0059] Delivery: Through the logistics system, the shoes are delivered to customers safely and quickly.

[0060] In summary, the present invention elaborates in detail a method for manufacturing an adaptive military sole based on shape memory alloy, which significantly improves the wear resistance, impact resistance, adaptability and comfort of the sole, thereby meeting the use requirements of special forces under extreme conditions. Specifically: This method adopts shape memory alloy to significantly enhance the wear resistance and impact resistance of the sole, ensuring its performance stability in harsh environments. At the same time, the adaptive characteristics of shape memory alloy also allow the sole to automatically adjust its shape and performance under different temperature and pressure conditions, thereby providing optimal support and comfort, and effectively reducing foot fatigue and discomfort. In addition, this method combines an automated production line and an optimized process flow, which not only improves production efficiency, but also reduces production costs and ensures consistency in product quality.

Claims

1. A method for manufacturing an adaptive military shoe sole based on shape memory alloy, characterized in that: The following steps are involved: (a) Material preparation: selecting shape memory alloy as the main material of the sole, selecting a high-performance substrate, and selecting an adhesive; (b) Preforming of shape memory alloys: designing and modeling, cutting and forming shape memory alloys; (c) Heat treatment: annealing and shape memory training of the preformed shape memory alloy; (d) Composite with substrate: surface treatment, adhesive coating and composite treatment of shape memory alloy and substrate; (e) Automated assembly: using automated production lines for component preparation, precision assembly, and quality inspection; (f) Performance testing: Conduct wear resistance test, impact resistance test and self-adaptability test on the assembled soles; (g) Quality inspection: visual inspection, size inspection, recording and traceability of soles; (h) Packaging and delivery: The qualified soles are packaged, labeled with product information, and delivered through the logistics system.

2. The method for manufacturing an adaptive military shoe sole based on shape memory alloy according to claim 1, characterized in that: The shape memory alloy in step (a) is selected from nickel-titanium alloy.

3. The method for manufacturing an adaptive military shoe sole based on shape memory alloy according to claim 1, characterized in that: The high-performance substrate in step (a) is selected from at least one of aramid fiber, ultra-high molecular weight polyethylene (UHMWPE) and polyamide fiber.

4. The method for manufacturing an adaptive military shoe sole based on shape memory alloy according to claim 1, characterized in that: The design and modeling described in step (b) uses computer-aided design (CAD) software to perform three-dimensional modeling.

5. The method for manufacturing an adaptive military shoe sole based on shape memory alloy according to claim 1, characterized in that: The annealing treatment temperature in step (c) is set between 400° C. and 500° C., and the time is 30 minutes to 60 minutes.

6. The method for manufacturing an adaptive military shoe sole based on shape memory alloy according to claim 1, characterized in that: The shape memory training temperature in step (c) is set near the phase transition temperature of the shape memory alloy, and the number of cycles is 3 to 5 times.

7. The method for manufacturing an adaptive military shoe sole based on shape memory alloy according to claim 1, characterized in that: The adhesive in step (d) is selected from polyurethane.

8. The method for manufacturing an adaptive military shoe sole based on shape memory alloy according to claim 1, characterized in that: The composite treatment temperature in step (d) is set between 100°C and 150°C, the pressure is set between 0.5 MPa and 1.5 MPa, and the time is set between 30 minutes and 60 minutes.

9. The method for manufacturing an adaptive military shoe sole based on shape memory alloy according to claim 1, characterized in that: The wear resistance test described in step (f) is performed using a Taber wear tester, the impact resistance test is performed using an impact tester, and the adaptability test is performed using a temperature cycle box.