Topological structure design method of 3D printing shoe sole based on foot region

Abstract

The invention relates to the field of 3D printing soles, in particular to a foot region-based topological structure design method for 3D printing soles, which comprises the following sequentially executed steps: S1, acquiring a topological structure database; s2, the elastic modulus E, the rebound rate Re, the shear modulus G, the relative density # imgabs 0 #, the yield strength # imgabs 1 #, the compression strength # imgabs 2 #, the damping coefficient # imgabs 3 #, the fatigue life # imgabs 4 #, the torsional rigidity # imgabs 5 # and the energy absorption efficiency # imgabs 6 # corresponding to each topological structure in the topological structure database are obtained; s3, dividing the sole into a half sole region, an arch region and a rear sole region, and constructing a selection function # imgabs7 # for selecting a topological structure for each region of the sole; s4, according to the performance requirements of all the subareas of the shoe sole, all factors of a selection function # imgabs8 # of all the subareas of the shoe sole are set, filling lattice structures used for filling the half sole area, the arch area and the rear sole area of the shoe sole are selected respectively, and a 3D shoe sole printing scheme is obtained; and the quality of the shoe sole is effectively ensured, so that various parameters better meet the design requirements.

Description

Technical Field

[0001] The invention relates to the field of 3D printed soles, and in particular to a topological structure design method of a 3D printed sole based on foot division. Background Art

[0002] As a periodic porous structure, the lattice structure can achieve a weight reduction of more than 70% due to its high design flexibility, high specific strength and specific stiffness.

[0003] In the context of rapid progress in science and technology, people pay more and more attention to health, especially the health of the "second heart" of the foot. Therefore, higher requirements are placed on the quality of shoes, especially the soles. In the prior art, when 3D printing the sole, the topological structure of the sole is often designed first, and then the sole is directly 3D printed. This method is mainly based on the experience of the designer, resulting in the quality of the 3D printed sole cannot be guaranteed. Summary of the invention

[0004] The object of the present invention is to provide a topological structure design method for a 3D printed sole based on foot division that can ensure the quality of the sole.

[0005] In order to achieve the above object, the present invention adopts such technical solution: A method for designing a topological structure of a 3D printed sole based on foot zoning comprises the following steps performed in sequence: S1: Create a tetrahedron using 8 first construction points, use the midpoint of each edge of the tetrahedron as the second construction point, use the center point of each face of the tetrahedron as the third construction point, and use the center of the tetrahedron as the fourth construction point. Randomly connect the above construction points to form topological structures of various structures, and obtain a topological structure database; S2: Obtain the elastic modulus E, rebound rate Re, shear modulus G, and relative density corresponding to each topological structure in the topological structure database , yield strength , compression strength , damping coefficient , fatigue life , torsional stiffness Energy absorption efficiency ; S3: Divide the sole into the forefoot area, the arch area and the rear foot area, and construct the following selection function for selecting the topological structure for each partition of the sole: : ; in, , is the elastic modulus factor, is the average elastic modulus of the topological structure database; , is the rebound factor, is the average rebound rate of the topology database; , is the shear modulus factor, is the average shear modulus of the topological structure database; , is the relative density factor, is the average relative density of the topological structure database; , is the yield strength factor, is the average yield strength of the topological structure database; , is the compression strength factor, is the average compression strength of the topology database; , is the damping coefficient factor, is the average damping coefficient of the topological structure database; , is the fatigue life factor, is the average fatigue life of the topology database; , is the torsional stiffness factor, is the average torsional stiffness of the topology database; , is the energy absorption efficiency factor, is the average energy absorption efficiency of the topological structure database; S4: Set the selection function of each partition of the sole according to the performance requirements of each partition of the sole The selection function of each topological structure in the topological structure database is calculated by various factors , select the selection function The topological structure with the largest value is used as the filling lattice structure of the partition, and the filling lattice structures used to fill the forefoot area, arch area and rear foot area of ​​the sole are selected respectively to obtain the 3D sole printing solution.

[0006] Preferably, in step S2, the elastic modulus E, rebound rate Re, shear modulus G, yield strength corresponding to each topological structure are obtained by testing or CAE analysis method. , compression strength , damping coefficient , fatigue life , torsional stiffness Energy absorption efficiency .

[0007] Preferably, the relative density of each topological structure is directly obtained using CAD software .

[0008] Preferably, when setting the selection function When the various factors are considered, the forefoot area is characterized by elastic modulus E, rebound rate Re and fatigue life As a priority parameter, the arch area is characterized by torsional stiffness. and relative density As a priority parameter, the rear foot area is based on energy absorption efficiency , compression strength and the damping coefficient as a priority parameter.

[0009] By adopting the above-mentioned design scheme, the beneficial effect of the present invention is that: the present application sets a selection function for selecting a topological structure for each partition of the sole. , calculate the selection function of each topology in the topology database for selecting the topology for each partition of the sole , the factors corresponding to each parameter can be set according to the design requirements, and the corresponding filling lattice structure can be automatically obtained from the topological structure database. Compared with relying on manual experience to design the sole, this application verifies the mechanical performance characteristics to obtain a filling lattice structure that better meets the design requirements, effectively ensuring the quality of the sole and making various parameters more in line with the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A schematic diagram of the structure of a tetrahedron constructed according to the present invention; Figure 2 A partial display diagram of the topological structure database of the present invention; Figure 3 It is a schematic diagram of the structure of the butterfly-shaped unit cell of the present invention; Figure 4 It is a schematic diagram of the structure of the Diamond unit cell of the present invention; Figure 5 Schematic diagram of the structure of the BCC unit cell of the present invention. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0012] A method for designing a topological structure of a 3D printed sole based on foot zoning comprises the following steps performed in sequence: S1: Figure 1 As shown, eight first construction points (blue points) are used to create a tetrahedron, the midpoint of each edge of the tetrahedron is used as the second construction point (pink point), the center point of each face of the tetrahedron is used as the third construction point (green point), and the center of the tetrahedron is used as the fourth construction point (brown point). The above construction points are randomly connected to form topological structures of various structures, and a topological structure database is obtained, such as Figure 2 As shown; by implementing different construction point connection methods, multiple topological structures are obtained, each of which has specific geometric size and shape characteristics. The above method can also be used to create other simple geometric shapes such as octahedron and cube.

[0013] S2: Obtain the elastic modulus E, rebound rate Re, shear modulus G, and relative density corresponding to each topological structure in the topological structure database , yield strength , compression strength , damping coefficient , fatigue life , torsional stiffness Energy absorption efficiency ; In this embodiment, the elastic modulus E, rebound rate Re, shear modulus G, yield strength corresponding to each topological structure can be obtained by testing or CAE analysis method. , compression strength , damping coefficient , fatigue life , torsional stiffness Energy absorption efficiency CAD software can be used to directly obtain the relative density of each topological structure By obtaining the above data, we can have a data evaluation on the performance of each topology in the topology database, which is more scientific and reasonable than designing based on manual experience.

[0014] S3: The sole is divided into the forefoot area, the arch area and the rear foot area. The forefoot area is mainly responsible for cushioning and propulsion when walking, the arch area mainly provides support and stability for the foot, and the rear foot area is mainly responsible for propulsion and stability when walking; Construct the following selection function for selecting the topology for each partition of the sole : ; in, , is the elastic modulus factor, is the average elastic modulus of the topological structure database; , is the rebound factor, is the average rebound rate of the topology database; , is the shear modulus factor, is the average shear modulus of the topological structure database; , is the relative density factor, is the average relative density of the topological structure database; , is the yield strength factor, is the average yield strength of the topological structure database; , is the compression strength factor, is the average compression strength of the topology database; , is the damping coefficient factor, is the average damping coefficient of the topological structure database; , is the fatigue life factor, is the average fatigue life of the topology database; , is the torsional stiffness factor, is the average torsional stiffness of the topology database; , is the energy absorption efficiency factor, is the average energy absorption efficiency of the topological structure database; the factor here is the weight.

[0015] S4: Set the selection function of each partition of the sole according to the performance requirements of each partition of the sole In this embodiment, when setting the selection function When the various factors are considered, the forefoot area is characterized by elastic modulus E, rebound rate Re and fatigue life As a priority parameter, the arch area is characterized by torsional stiffness. and relative density As a priority parameter, the rear foot area is based on energy absorption efficiency , compression strength and the damping coefficient As a priority parameter; calculate the selection function of each topology in the topology database , select the selection function The topological structure with the largest value is used as the filling lattice structure of the partition, and the filling lattice structures used to fill the forefoot area, arch area and rear foot area of ​​the sole are selected respectively to obtain the 3D sole printing solution.

[0016] In this embodiment, according to the performance requirements of the forefoot area, the elastic modulus E, the rebound rate Re and the fatigue life As priority parameters, the elastic modulus E, spring rate Re and fatigue life Set all factors to 1, set other factors to 0.5, and select the selection function The topological structure corresponding to the maximum value is used as the filling lattice structure of the forefoot area. The topological structure selected by the factor setting of this embodiment for filling the forefoot area is a butterfly-shaped unit cell, such as Figure 3 shown.

[0017] According to the performance requirements of the arch area, the torsional stiffness and relative density These two parameters are priority parameters and define the torsional stiffness and relative density The factors of are all set to 1, and the other factors are set to 0.5. Select the selection function The topological structure corresponding to the maximum value is used as the filling lattice structure of the arch area. The topological structure selected by the factor setting of this embodiment for filling the arch area is the Diamond unit cell, such as Figure 4 shown.

[0018] According to the performance requirements of the rear palm area, energy absorption efficiency , compression strength and the damping coefficient As the priority parameter, the energy absorption efficiency is defined as , compression strength and the damping coefficient The factors of are all set to 1, and the other factors are set to 0.5. Select the selection function The topological structure corresponding to the maximum value is used as the filling lattice structure of the rear palm area. The topological structure selected by the factor setting of this embodiment for filling the rear palm area is a BCC unit cell, such as Figure 5 shown.

[0019] In summary, the present application sets a selection function for selecting a topological structure for each partition of the sole. , calculate the selection function of each topology in the topology database for selecting the topology for each partition of the sole , the factors corresponding to each parameter can be set according to the design requirements, and the corresponding filling lattice structure can be automatically obtained from the topological structure database. Compared with relying on manual experience to design the sole, this application verifies the mechanical performance characteristics to obtain a filling lattice structure that better meets the design requirements, effectively ensuring the quality of the sole and making various parameters more in line with the design requirements.

[0020] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A topological structure design method for a 3D printed sole based on foot zoning, characterized in that: The steps include the following steps: S1: Create a tetrahedron using 8 first construction points, use the midpoint of each edge of the tetrahedron as the second construction point, use the center point of each face of the tetrahedron as the third construction point, and use the center of the tetrahedron as the fourth construction point. Randomly connect the above construction points to form topological structures of various structures, and obtain a topological structure database; S2: Obtain the elastic modulus E, rebound rate Re, shear modulus G, and relative density corresponding to each topological structure in the topological structure database , yield strength , compression strength , damping coefficient , fatigue life , torsional stiffness Energy absorption efficiency ; S3: Divide the sole into the forefoot area, the arch area and the rear foot area, and construct the following selection function for selecting the topological structure for each partition of the sole: : ; in, , is the elastic modulus factor, is the average elastic modulus of the topological structure database; , is the rebound factor, is the average rebound rate of the topology database; , is the shear modulus factor, is the average shear modulus of the topological structure database; , is the relative density factor, is the average relative density of the topological structure database; , is the yield strength factor, is the average yield strength of the topological structure database; , is the compression strength factor, is the average compression strength of the topology database; , is the damping coefficient factor, is the average damping coefficient of the topological structure database; , is the fatigue life factor, is the average fatigue life of the topology database; , is the torsional stiffness factor, is the average torsional stiffness of the topology database; , is the energy absorption efficiency factor, is the average energy absorption efficiency of the topological structure database; S4: Set the selection function of each partition of the sole according to the performance requirements of each partition of the sole The selection function of each topological structure in the topological structure database is calculated by various factors , select the selection function The topological structure with the largest value is used as the filling lattice structure of the partition, and the filling lattice structures used to fill the forefoot area, arch area and rear foot area of ​​the sole are selected respectively to obtain the 3D sole printing solution.

2. The topological structure design method of the 3D printed sole based on foot zoning according to claim 1, characterized in that: In step S2, the elastic modulus E, rebound rate Re, shear modulus G, yield strength corresponding to each topological structure are obtained by testing or CAE analysis method. , compression strength , damping coefficient , fatigue life , torsional stiffness Energy absorption efficiency .

3. The topological structure design method of the 3D printed sole based on foot zoning according to claim 2, characterized in that: Directly obtain the relative density of each topological structure using CAD software .

4. The topological structure design method of the 3D printed sole based on foot zoning according to claim 1, characterized in that: In setting the selection function When the various factors are considered, the forefoot area is characterized by elastic modulus E, rebound rate Re and fatigue life As a priority parameter, the arch area is characterized by torsional stiffness. and relative density As the priority parameter, the rear palm area is based on energy absorption efficiency , compression strength and the damping coefficient as a priority parameter.

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