Triangle star honeycomb system parametric 3D printing sole for plantar pressure distribution

Abstract

The present invention specifically relates to a triangular star honeycomb system parametric 3D printing sole for plantar pressure distribution, and its preparation method mainly includes the following steps: scanning the foot to obtain a plantar pressure distribution map; using Rhino software and Grasshopper plug-in to parametrically model the sole; creating a triangular star hollow honeycomb system, and accurately defining the interference point range according to the maximum pressure area, adjusting the parameters of the triangular star honeycomb unit cell; applying TPU material; and using an FDM 3D printer for printing. Its preparation system includes a mechanical metamaterial structure system, a parameter design system, a TPU material application, and a digital manufacturing system. The present invention quickly and effectively performs customized corrective sole design, and adjusts a personalized sole by simply operating the parameter instructions in grasshopper to meet the excellent plantar pressure distribution requirements, solves the plantar pressure problem of the human body, and alleviates the damage to human health caused by unbalanced feet and the forces acting on the human body.

Description

Technical Field

[0001] The present invention belongs to the technical field of 3D printing, and in particular relates to a triangular star honeycomb system parameterized 3D printing sole for plantar pressure distribution. Background Art

[0002] The sole is a component of footwear, affecting the biomechanics and dynamic behavior of footwear. The performance of shoes can be improved through materials and structures, and shoes with superior performance can provide comfort and cushioning by redistributing foot pressure to protect the health of the human body and feet. In recent years, lattice structure is one of the most recognized structures in footwear midsole design. FDM, as a popular 3D printing method, is cost-effective, green manufacturing, and suitable for a variety of materials. However, due to poor precision, it is impossible to print complex structures such as unsupported lattice structures.

[0003] Therefore, it is necessary to explore an innovative modeling method that supports 3D parametric design, which can replace the lattice structure sole, and at the same time adapt to the FDM 3D printing method and personal customization by controlling the sole parameter variables, and develop 3D printed parametric soles, which can reduce the plantar pressure of users or patients.

[0004] Rhinoceros comes with a node-based visual language Grasshopper, which allows designers to easily change visual operation nodes to quickly perform parametric design by connecting the programming methods of internal battery component efficiency and building programs that follow a set of rules. The 3D model created by the parameter-driven algorithm can be generated based on the unit cell structure provided by Grasshopper to control the local geometric density (unit cell) variables that determine its stiffness, which will affect the plantar pressure. An algorithm was created to refine functional and customizable midsoles, such as lattice structures with digital manufacturing, which involves scanning data and combining other specific modeling software. It is an operational challenge for designers who are not proficient in computer-aided technology. At the same time, the modeling process is too complicated and time-consuming to achieve rapid production of personality and customization. In previous studies, we have confirmed that the 3D printed triangular star-shaped porous outsole made of TPU has good surface pressure distribution.

[0005] Currently, many shock-proof and pressure-reducing sole designs on the market basically apply the principle of lattice structure mechanical metamaterials. This is a complex 3D geometric design process. Designers need to have professional computer-aided design skills and high-precision 3D printing technology. However, this kind of production machines are often very expensive, which is not conducive to the popularization of functional soles. Time-consuming and high-cost are disadvantages. Summary of the invention

[0006] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a preparation method and preparation system of a triangular star honeycomb system parametric 3D printed plantar pressure distribution sole. The method is based on an improved algorithm for the design of a triangular star Poisson's ratio pattern sole and an advanced 3D digital production technology FDM manufacturing. It is a production method of a 3D printed corrective sole with adjustable plantar pressure, which solves the problem of plantar pressure on the human body and alleviates the damage to human health caused by unbalanced feet and forces acting on the human body.

[0007] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0008] A method for preparing a triangular star honeycomb system parametric 3D printed sole with plantar pressure distribution mainly comprises the following steps:

[0009] Step 1: Scan the foot to obtain the plantar pressure distribution map;

[0010] Step 2: Use Rhino software and Grasshopper plug-in to parametrically model the sole;

[0011] Step 3: Create a triangular star hollow honeycomb system, accurately define the interference point range according to the maximum pressure area, and adjust the parameters of the triangular star honeycomb unit cell;

[0012] Step 4: Apply TPU material;

[0013] Step 5: Print using an FDM 3D printer.

[0014] Furthermore, the above-mentioned parametric sole modeling using Rhino software and Grasshopper plug-in mainly includes the following steps:

[0015] S1: Open Rhino and Grasshopper plug-ins;

[0016] S2: Generate parameterized triangular star unit structure group;

[0017] S3: Modeling the outer contour plane of the triangular star hollow sole;

[0018] S4: According to the scanned plantar pressure distribution map, the interference point is located at its center and parameterized design is performed;

[0019] S5: Extrusion parameterized sole thickness;

[0020] S6: Algorithm 3D parametric sole model establishment.

[0021] Furthermore, the method for preparing the triangular star honeycomb system parametric 3D printed sole with plantar pressure distribution adjusts the triangular star honeycomb unit cell parameters by operating the Cull Pattern cell and related data in grasshopper.

[0022] Furthermore, the parameters of the above-mentioned triangular star honeycomb unit cell include density, angle, rod length and number.

[0023] A preparation system for a triangular star honeycomb system parametric 3D printed sole with plantar pressure distribution, comprising: a mechanical metamaterial structure system, a parameter design system, a TPU material application and a digital manufacturing system.

[0024] Furthermore, the above-mentioned mechanical metamaterial structure system uses a triangular star hollow honeycomb structure system.

[0025] Furthermore, the parametric design system uses Rhino software and Grasshopper plug-in to parametrically model the sole.

[0026] Furthermore, the above-mentioned digital manufacturing system adopts an FDM 3D printer.

[0027] A triangular star honeycomb system parametric 3D printed sole for plantar pressure distribution is manufactured using the above-mentioned preparation method.

[0028] Furthermore, the above-mentioned triangular star honeycomb system parameterizes 3D printed plantar pressure distribution soles, including the forefoot, midfoot and rearfoot, and uses algorithms to interfere with the pressure ranges of the forefoot, midfoot and rearfoot, adjusts the parameters of the triangular star honeycomb cells, and controls the seismic resistance of the forefoot, midfoot and rearfoot.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The method for preparing the triangular star honeycomb system parametric 3D printing sole with plantar pressure distribution of the present invention is based on the algorithm for designing the improved triangular star Poisson's ratio pattern sole and the method for producing the 3D printing corrective sole with adjustable plantar pressure manufactured by an advanced 3D digital production technology FDM, which solves the problem of plantar pressure of the human body and alleviates the damage to human health caused by unbalanced feet and the forces acting on the human body;

[0031] 2. The present invention adopts a method of controlling the Cull Pattern mode components in Grasshopper, and simply changes some variables according to the algorithm logic to meet the personalized and customized requirements of function and aesthetics. These variables are related to density, rotation angle, shape and thickness of geometric shapes. Within the functional and aesthetic range of the sole, the mechanical conditions of specific high-pressure local areas of the sole can be changed by the algorithm according to the individual foot pressure conditions. It can be seen that the triangular star-shaped porous sole design method and innovative process of the present invention can help shoe designers, shoe manufacturers, patients or users to customize functional and aesthetic soles more easily and quickly;

[0032] 3. The 3D printed triangular star hollow sole produced by the FDM digital manufacturing technology of TPU material in the present invention has the properties of light weight, wear resistance, durability, safety, comfort, shock resistance and rehabilitation. The optimization technology of the invention involves structural design, algorithm modeling, flexible material selection and green sustainable production FDM digital manufacturing. The triangular star hollow honeycomb structure system design strengthens the performance of its products. The simple and efficient algorithm 3D modeling method can achieve multifunctional adjustability by simply operating some of the parameters. The TPU material has the characteristics of light weight and adjustable performance. The invention is suitable for low-cost FDM digital manufacturing technology to realize the production of personalized customized functional soles.

[0033] 4. The algorithm of the present invention refers to the effective plantar pressure distribution map of the user, uses Rhino software and Grasshopper plug-in for design, creates a negative Poisson's ratio triangular star hollow honeycomb system, and accurately defines the interference point range according to its maximum pressure area, thereby adjusting the density, angle, rod length and other parameters of the triangular star honeycomb unit cell. The invented foamed sole 2D honeycomb structure does not require additional support points and is suitable for economical and advanced FDM production technology. The triangular star hollow honeycomb system has unique Poisson's ratio, light weight, shockproof and other superior properties, thereby improving the sole function;

[0034] 5. In terms of manufacturing process, FDM is a fused deposition modeling technology that can extrude materials and stack them layer by layer on a printing bed by hot-melt according to instructions, thereby shaping a 3D solid object. The machine is easy to operate, has low purchase cost, is compatible with various materials, and provides customized printing of multiple colors. By adjusting the printing parameters of the printing machine, the final performance of the finished product can be controlled, thereby achieving sustainable and environmentally friendly production, low cost, convenience, high efficiency and affordable equipment prices. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the preparation system of the triangular star honeycomb system parameterized 3D printing sole with plantar pressure distribution of the present invention.

[0036] Figure 2It is a 3D printed triangular star hollow algorithm designed sole manufacturing flow chart.

[0037] Figure 3 It is the 3D modeling process of the triangular star hollow sole based on algorithm modeling.

[0038] Figure 4 This is the working principle diagram of the triangular star hollow honeycomb system.

[0039] Figure 5 It is a schematic diagram of the design principle of the triangular star parametric hollow sole.

[0040] Figure 6 It is a 3D printed triangular star hollow sole designed based on a closed surface customized pressure zone.

[0041] Figure 7 It is a 3D printed triangular star hollow sole with a massage design based on 3D geometric pressure points.

[0042] Figure 8 It is a 3D printed triangular star hollow sole designed based on the 3D printing triangular star hollow algorithm. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0044] First, the terms involved in this embodiment are explained:

[0045] Algorithms: Parametric design is a process of writing the project itself as a function and process, modifying the initial conditions and calculating the project results by computer, thus automating the design process. Plugin window. Grasshopper is a graphical algorithm editor that is tightly integrated with Rhino's 3D modeling tools. Rhinoceros comes with a node-based visual language Grasshopper, which allows designers to easily change visual operation nodes to quickly perform parametric design by connecting the programming method of internal battery component efficiency and building a program that follows a set of rules.

[0046] 3-pointed star shape porous microstructure system: It has many pores and is compared to a chiral honeycomb, which we call a three-star (or) three-chiral honeycomb. It is a very popular microstructure system with a negative Poisson's ratio. Its potential tensile behavior is deformed by the mechanism of flexible ligament line connection and polygonal block rotation. The change of the characteristics of the uniaxial load system will directly affect the Poisson's ratio of the system, which means that the Poisson's ratio can be adjusted by the sensitivity of the hinge and the mechanism rod, for example, by adjusting the geometric parameters of the star-shaped perforation mechanism, such as size, opening state, number of star points, hole spacing, etc., so as to adjust the mechanical properties of these systems.

[0047] FDM digital manufacturing technology: FDM is the abbreviation of "Fused Deposition Modeling", which is a method of heating and melting various wire materials and then accumulating them into shapes. The working principle of FDM is: under the control of a computer, the heating nozzle moves in the XY plane according to the cross-sectional profile information of the product parts. The thermoplastic filamentary material is sent to the hot melt nozzle by the wire feeding mechanism, heated and melted into a semi-liquid state in the nozzle, and then extruded and selectively coated on the workbench. After rapid cooling, it forms layers of thin sheet contours. After each layer of cross-sectional molding is completed, the workbench will drop to a certain height, and then the next layer of cladding will be carried out, as if "drawing" the cross-sectional profile layer by layer, and this cycle will eventually form a three-dimensional product part.

[0048] TPU material: TPU (Thermoplastic polyurethanes) is a thermoplastic polyurethane elastomer rubber. TPU is a polymer material formed by the reaction of diisocyanate molecules such as diphenylmethane diisocyanate (MDI) or toluene diisocyanate (TDI) with macromolecular polyols and low molecular polyols (chain extenders). Its molecular structure is composed of rigid blocks obtained by the reaction of diphenylmethane diisocyanate (MDI) or toluene diisocyanate (TDI) and chain extenders, and flexible segments obtained by the reaction of diisocyanate molecules such as diphenylmethane diisocyanate (MDI) or toluene diisocyanate (TDI) with macromolecular polyols.

[0049] Plantar pressure distribution: Plantar pressure distribution refers to the force distribution between the sole of the foot and the supporting surface. High plantar pressure is an important risk factor for foot development and is associated with foot deformities, reduced plantar tissue thickness, and limited joint mobility. Normal foot pressure distribution is that the highest pressure is distributed on the heel and metatarsal heads, and the lowest pressure is distributed on the cuboid bone. The pressure distribution of foot diseases varies from case to case, and adjusting the plantar pressure distribution to a normal state is beneficial to provide protection and comfort to the human body.

[0050] This embodiment provides a method for preparing a triangular star honeycomb system parametric 3D printed sole with plantar pressure distribution, which uses a widely applicable algorithm design to quickly and effectively design customized corrective soles, and adjusts personalized soles by simply operating parameter instructions in grasshopper to meet excellent plantar pressure distribution requirements, provide comfort for human feet, and protect human health. The method for preparing a triangular star honeycomb system parametric 3D printed sole with plantar pressure distribution mainly includes the following steps:

[0051] Step 1: Scan the foot to obtain the plantar pressure distribution map;

[0052] Step 2: Use Rhino software and Grasshopper plug-in to parametrically model the sole;

[0053] Step 3: Create a triangular star hollow honeycomb system, accurately define the interference point range according to the maximum pressure area, and adjust the parameters of the triangular star honeycomb unit cell;

[0054] Step 4: Apply TPU material, which is a high-performance novel material;

[0055] Step 5: Print using an FDM 3D printer.

[0056] The 3D printing triangle star hollowing algorithm design shoe sole manufacturing flow chart of this embodiment is shown in the attached Figure 2 The algorithm refers to the user's effective plantar pressure distribution map, and is designed using Rhino software and Grasshopper plug-ins to create a negative Poisson's ratio triangular star hollow honeycomb system. The interference point range is accurately defined according to its maximum pressure area, thereby adjusting the density, angle, rod length and other parameters of the triangular star honeycomb unit cell. The invented foamed sole 2D honeycomb structure does not require additional support points and is suitable for economical and advanced FDM production technology. The use of special shoe material TPU Varioshore can better realize and enhance its lightweight, wear resistance, wear resistance, shock resistance and other properties, and can achieve efficient customized functional soles.

[0057] The 3D printed triangular star hollow sole produced by TPU material FDM digital manufacturing technology has the properties of durability, safety, comfort and rehabilitation. The optimization technology of this invention involves structural design, algorithm modeling, flexible material selection and green sustainable production FDM digital manufacturing. The triangular star hollow honeycomb structure system design enhances the performance of its products. The simple and efficient algorithm 3D modeling method can achieve multi-functional adjustability by simply operating some of the parameters. TPU material has the characteristics of lightweight and adjustable performance. This invention is suitable for low-cost FDM digital manufacturing technology to realize the production of personalized customized functional soles.

[0058] In this embodiment, the parametric sole modeling using Rhino software and Grasshopper plug-in mainly includes the following steps:

[0059] S1: Open Rhino and Grasshopper plug-ins;

[0060] S2: Generate parameterized triangular star unit structure group;

[0061] S3: Modeling the outer contour plane of the triangular star hollow sole;

[0062] S4: According to the scanned plantar pressure distribution map, the interference point is set at its center and parameterized design is performed;

[0063] S5: Extrusion parameterized sole thickness;

[0064] S6: Algorithm 3D parametric sole model establishment.

[0065] 3D printing triangle star hollow algorithm design sole manufacturing flow chart refer to the attached Figure 2 The working principle diagram of the triangular star hollow honeycomb system is shown in the attached Figure 4 The triangular star hollow structure system is a mechanical metamaterial, which is characterized by the reverse visual phenomenon of biaxial expansion or compression under uniaxial tension and compression. When the surface is compressed, the material molecules gather toward the pressure center, and the rigidity of the compressed position is enhanced.

[0066] There are many methods for 3D modeling and design, including software such as Rhino, Fusion360, SketchUp, etc., which can also achieve the final design, but the subsequent modification work is very cumbersome. The design of this embodiment is completed by an algorithm, and customized functional parameters can be obtained by simply changing the parameters therein to achieve customized digital production, which means that only by establishing a basic model, infinite performance customization can be achieved by adjusting algorithms such as cull Pattern. Such optimization functions allow people who do not understand computers or even design to design soles suitable for users as long as they master a few simple adjustments to the function key positions and modeling production knowledge.

[0067] The method for preparing the triangular star honeycomb system parametric 3D printed sole with plantar pressure distribution of the present embodiment adjusts the triangular star honeycomb unit cell parameters, including density, angle, rod length, quantity, etc., by operating the Cull Pattern cell and related data in grasshopper.

[0068] This embodiment also provides a preparation system for a triangular star honeycomb system parameterized 3D printed sole with plantar pressure distribution, as shown in the attached drawings. Figure 1 , the preparation system includes: mechanical metamaterial structure system, parameter design system, TPU material application and digital manufacturing system.

[0069] Preferably, the mechanical metamaterial structure system of this embodiment uses a triangular star hollow honeycomb structure system, the parameter design system uses Rhino software and Grasshopper plug-in for parametric sole modeling, and the digital manufacturing system uses an FDM 3D printer.

[0070] In addition, this embodiment also provides a triangular star honeycomb system parameterized 3D printed sole for plantar pressure distribution, which is manufactured using the preparation method of this embodiment. Figure 5 The triangular star honeycomb system parameterizes the 3D printed plantar pressure distribution sole, including the forefoot, midfoot and rearfoot. The algorithm is used to interfere with the pressure range of the forefoot, midfoot and rearfoot, adjust the parameters of the triangular star honeycomb cell, and control the seismic resistance of the forefoot, midfoot and rearfoot.

[0071] Attached Figure 5 This is a schematic diagram of the design principle (basic version) of the triangular star parametric hollow sole (bottom plane). According to ergonomics, when the human body is standing or walking, gravity falls on the front and back of the foot, and the pressure in the middle of the foot is the smallest. The algorithm is used to interfere with the high pressure range, and the density of the infinite element (unit cell) is adjusted according to the maximum pressure value, so as to control the shockproof ability of a certain area of ​​the sole, realize personalized customization, and provide foot protection and comfort.

[0072] Working principle: When a normal human body is walking or standing, shoes can relieve the counter pressure on the sole of the foot and the ground. Under normal circumstances, the weight of the human body generally falls on the front of the foot and the middle of the heel, at this time, an extremely high pressure area is formed, which will react on the human body; soles that are not ergonomic will have a great impact on physical health during long-term use; this invention aims to optimize the energy absorption performance of high-pressure areas of the human body, such as increasing the rigidity and cushioning strength of the pressure area, so as to reduce the reaction force on the contact surface of the sole of the foot, reduce the burden on the foot and increase comfort.

[0073] The purpose of this embodiment is to continuously optimize the triangular star porous outsole design based on the algorithm and normal human biomechanical peak pressure local (ignoring the scanning step for individuals) data process, which can not only model complex models simply and easily, but also achieve personalized and customized needs. Users and patients are satisfied with the redistribution of plantar pressure to provide comfort and treatment, and it is suitable for FDM manufacturing methods.

[0074] In order to develop an algorithm-based personalized parametric triangular star hollow sole, this embodiment involves the application of Rhinoceros3D software and Grasshopper plug-in. By drawing on a general JPGE image based on the Grasshopper algorithm, a 3D modeling process of a top view sole contour geometry with a size of 230x 90mm is defined. The porous triangular star pattern is generated based on hexagonal geometry. First, the pattern system is overlapped on the lower part of the sole contour to outline the parametric outer contour of the sole based on aesthetics and human mechanics. The pressure area is determined based on the import of a suitable human plantar pressure distribution map, and then two interference points are set in the central area of ​​the heel and forefoot sole to affect the local geometric (cell) density. Then, the excess pattern outside the sole contour is trimmed to generate a star-shaped porous sole shape. The sole thickness is extruded and the file is saved in STL format, and then converted into G-Code code 3D printing format for printing. Based on this basic parametric triangular star porous sole 3D modeling model, the inventors also promoted two other designs, one is a 3 mm thick compressed conical 3D geometric pressure point massage triangular star hollow sole, the other is a closed surface customized pressure zone triangular star hollow sole with interference point influence area, the thickness of this embodiment is 7.5 and 10 mm respectively. The 3D printed triangular star sole prototype was prepared using Varioshore TPU material using FDM 3D printing method based on 50% filling, 240 extrusion temperature and 50 bed temperature printing conditions.

[0075] 3D printed triangular star hollow sole based on closed surface customized pressure zone design Figure 7 , the 3D printed triangular star hollow sole with massage design based on 3D geometric pressure points is shown in the attached Figure 6 , based on the 3D printing triangle star hollow out algorithm design 3D printing triangle star hollow out sole reference attached Figure 8 .

[0076] The sole design of this embodiment meets the personalized and customized requirements of function and aesthetics by simply changing some variables, which are related to density, rotation angle, shape and thickness of geometry in high-pressure areas. Method for controlling battery cull pattern components in Grasshopper. Within the scope of the function and aesthetics of the sole, the specific high-pressure local areas of the sole are changed by algorithm, and the pressure points and closed heel detail design of the basic high-pressure zone massage of the function are optimized, and printed with 7.5 and 10 mm thickness. In addition, another 10 mm 3D geometric pressure point massage triangular star hollow sole and closed surface customized pressure zone triangular star hollow sole of the impact area are produced for comparison, so 6 designs will be used in this study. The resulting prototypes show that as the thickness increases, the weight and printing time will also increase; the 7.5 mm parametric triangular star porous sole prototype has the heaviest weight, the largest thickness and the shortest printing time, and the 10 mm thickness triangular star hollow honeycomb foam sole prototype has the heaviest weight, the largest thickness and the shortest printing time. The resulting triangular star-shaped porous sole design method and innovative process can help shoe designers, shoe manufacturers, patients or users to customize functional and aesthetic soles more easily and quickly, contributing to the popularization of 3D printed health care sole design.

[0077] This embodiment uses the Grasshopper program to model the triangular star-shaped parametric sole through an algorithmic method, which can easily and conveniently realize complex parameter design to meet functional individuality and customization requirements. The basic design can be changed and modified, and can also be directly and quickly manufactured from an FDM printer. This novel design allows for a versatile design that can adapt to the foot pressure conditions of different users.

[0078] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A method for preparing a triangular star honeycomb system parametric 3D printing sole with plantar pressure distribution, characterized in that: The main steps are as follows: Step 1: Scan the foot to obtain the plantar pressure distribution map; Step 2: parametric sole modeling using Rhino software and Grasshopper plug-in; the parametric sole modeling using Rhino software and Grasshopper plug-in mainly includes the following steps: S1: opening Rhino and Grasshopper plug-ins; S2: generating a parametric triangular star unit structure group; S3: modeling a triangular star hollow sole outer contour plane; S4: setting an interference point at its center according to the scanned sole pressure distribution map, and performing parametric design; S5: extruding the parametric sole thickness; S6: establishing an algorithm 3D parametric sole model; Step 3: Create a triangular star hollow honeycomb system, accurately define the interference point range according to the maximum pressure area, and adjust the parameters of the triangular star honeycomb unit cell; wherein, the parameters of the triangular star honeycomb unit cell are adjusted by operating the Cull Pattern battery and related data in grasshopper; the parameters of the triangular star honeycomb unit cell include density, angle, rod length and number; Step 4: Apply TPU material; Step 5: Print using an FDM 3D printer.

2. A triangular star honeycomb system parametric 3D printing sole for plantar pressure distribution, characterized in that: The method according to claim 1 is used for manufacturing.

3. The triangular star honeycomb system parameterized 3D printed sole for plantar pressure distribution according to claim 2, characterized in that: Including the forefoot, midfoot and rear foot, the algorithm is used to interfere with the pressure range of the forefoot, midfoot and rear foot, adjust the parameters of the triangular star honeycomb cell, and control the seismic resistance of the forefoot, midfoot and rear foot.

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