WO2020208938A1 - Structure poreuse et appui-tête de véhicule - Google Patents

Structure poreuse et appui-tête de véhicule Download PDF

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Publication number
WO2020208938A1
WO2020208938A1 PCT/JP2020/006070 JP2020006070W WO2020208938A1 WO 2020208938 A1 WO2020208938 A1 WO 2020208938A1 JP 2020006070 W JP2020006070 W JP 2020006070W WO 2020208938 A1 WO2020208938 A1 WO 2020208938A1
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WIPO (PCT)
Prior art keywords
bone
basic
porous structure
axis direction
cell
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Application number
PCT/JP2020/006070
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English (en)
Japanese (ja)
Inventor
大一 板橋
泰輔 米澤
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株式会社ブリヂストン
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Filing date
Publication date
Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Publication of WO2020208938A1 publication Critical patent/WO2020208938A1/fr

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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
    • A47C27/14—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with foamed material inlays
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/38—Support for the head or the back for the head
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B29C64/264—Arrangements for irradiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/386—Data acquisition or data processing for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/80—Head-rests
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/80—Head-rests
    • B60N2/885—Head-rests provided with side-rests
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof

Definitions

  • the present invention relates to a porous structure and a headrest for a vehicle.
  • a cushioning porous structure for example, urethane foam
  • a chemical reaction in, for example, mold molding for example, Patent Document 1.
  • Such a porous structure is used, for example, as a cushion material for a seat or a headrest thereof.
  • the porous structure when the porous structure is manufactured through the step of foaming by a chemical reaction as described above, it usually has a substantially uniform cushioning property in all directions. Therefore, for example, in order to suppress lateral displacement when a large force is applied in a specific direction to a supported body (for example, a seated person or its head) supported by the porous structure, for example, another member is used. It had to be added, and it was difficult to prevent lateral displacement of the porous structure and thus the supported body only by the structure of the porous structure.
  • An object of the present invention is to provide a porous structure and a headrest for a vehicle, which can suppress lateral displacement in a specific direction.
  • the porous structure of the present invention A porous structure made of flexible resin or rubber. With multiple bones, partitioning multiple cell holes, When at least one XYZ Cartesian coordinate system is virtually fixed, the virtual plane including the central axis of each of the two adjacent bones is set as the XY plane, and at least one of the XYZ Cartesian coordinate systems is used.
  • the rigidity of the porous structure in the uniaxial direction is greater than the rigidity of the porous structure in at least the other uniaxial direction.
  • the vehicle headrest of the present invention It has the above-mentioned porous structure.
  • FIG. 5 is a view taken along the arrow A showing the state of the porous structure of FIG. 1 when viewed from the direction of the arrow A of FIG. It is a B arrow view which shows the state when the porous structure of FIG. 1 is seen from the direction of the B arrow of FIG.
  • FIG. 5 is a perspective view which shows the basic cell of the porous structure of FIG. It is a drawing corresponding to FIG. 4, and is the perspective view which shows the 1st modification example of a basic cell. It is a drawing corresponding to FIG. 4, and is the perspective view which shows the 2nd modification of the basic cell.
  • FIG. 4 is a drawing corresponding to FIG. 4, and is a drawing for explaining a third modification example of the basic cell. It is a perspective view which shows the seat pad for a vehicle provided with the headrest for a vehicle which concerns on one Embodiment of this invention. It is a drawing for demonstrating an example of the manufacturing method of the porous structure which concerns on one Embodiment of this invention. It is a drawing corresponding to FIG. 1, and is a perspective view which shows a part of one modification of a porous structure. It is a D arrow view which shows the state when the C portion of the porous structure of FIG.
  • FIG. 15 (a) is a perspective view showing a bone portion of the skeleton portion of FIG. 14 in a state where no external force is applied
  • FIG. 15 (b) is a perspective view showing a bone portion of FIG. 15 (a) in a state where an external force is applied. It is a perspective view which shows the part.
  • the porous structure of the present invention is preferably used as a cushioning material, more preferably used as a cushioning material for seats, and even more preferably used as a headrest for vehicles.
  • FIGS. 1 to 8 and 11 to 13 the central axes of two adjacent bones (bone 2BAx and bone 2BAy shown in FIG. 1) among the plurality of bones described later.
  • the orientations of the X-axis, the Y-axis, and the Z-axis in an example of the XYZ Cartesian coordinate system in which the virtual plane including the above is the XY plane are displayed.
  • FIGS. 1 to 3 a part of the porous structure 1 according to the present embodiment having a substantially rectangular parallelepiped outer shape is viewed from different angles.
  • FIG. 1 is a perspective view showing the portion of the porous structure 1.
  • FIG. 2 is a side view showing a state in which the portion of the porous structure 1 of FIG. 1 is viewed from the direction of the arrow A.
  • FIG. 3 is a top view showing a state in which the portion of the porous structure 1 of FIG. 1 is viewed from the direction of the arrow B.
  • the porous structure 1 is formed by a 3D printer.
  • the entire porous structure 1 is integrally formed.
  • the porous structure 1 is made of a flexible resin or rubber.
  • the porous structure 1 includes a skeleton portion 2 that forms the skeleton of the porous structure 1.
  • the skeleton portion 2 exists almost entirely over the porous structure 1 and is made of a flexible resin or rubber.
  • the portion of the porous structure 1 other than the skeleton portion 2 is a void, in other words, the porous structure 1 is composed of only the skeleton portion 2.
  • the "flexible resin” refers to a resin that can be deformed when an external force is applied.
  • an elastomer-based resin is preferable, polyurethane is more preferable, and flexible polyurethane is preferable. It is more suitable.
  • the rubber include natural rubber and synthetic rubber. Since the porous structure 1 is made of a flexible resin or rubber, it can be compressed / restored and deformed according to the application / release of an external force, and can have cushioning properties. From the viewpoint of ease of manufacture by a 3D printer, the porous structure 1 is more preferably made of a flexible resin than that of a rubber. ..
  • the skeleton portion 2 of the porous structure 1 is composed of a plurality of bone portions 2B and a plurality of connecting portions 2J, and the entire skeleton portion 2 is integrally formed.
  • each bone portion 2B is formed in a columnar shape, and in this example, each bone portion 2B extends linearly.
  • Each connecting portion 2J connects the end portions 2Be to each other at a position where the end portions 2Be of a plurality of (for example, four) bone portions 2B extending in different directions are adjacent to each other.
  • the porous structure 1 has a repeating structure in which the basic cell 21 is connected in the X-axis direction, the Y-axis direction, and the Z-axis direction, respectively.
  • the basic cell 21 is a basic unit of the repeating structure included in the porous structure 1.
  • the bone portions 2B corresponding to each other are arranged so as to face the same direction. That is, when the porous structure 1 is viewed from an arbitrary direction, the plurality of basic cells 21 are connected to the other basic cells 21 in such an orientation that they appear to have the same shape as each other.
  • the predetermined "axial direction” refers to the same direction as the axis and the direction parallel to the axis.
  • the connecting portions of the basic cells 21 adjacent to each other are shared.
  • the basic bone 2BA included in one basic cell 21 is shared with other adjacent basic bones 2BA.
  • the annular portion 211 that one basic cell 21 has on the outermost side is shared with other basic cells 21 adjacent to each other on the annular portion 211 side, which will be described later.
  • the small annular portion 211S included in the annular portion 211 which will be described later, is shared with other basic cells 21 adjacent to the small annular portion 211S side.
  • the macrocyclic portion 211L included in the annular portion 211 which will be described later, is shared with other basic cells 21 adjacent to each other on the large annular portion 211L side.
  • the basic cell 21 includes a basic bone portion 2BA and an additional bone portion 2BB as a plurality of bone portions 2B, and thus the porous structure 1 has a plurality of bone portions 2B as a basic bone portion 2BA. , Includes additional bone 2BB.
  • the central axis O of the basic bone 2BA constitutes each side of the truncated octahedron (Kelvin tetradecahedron).
  • the truncated octahedron (Kelvin tetradecahedron) is a polyhedron (semi-regular polyhedron) composed of six regular quadrilateral constituent surfaces and eight regular hexagonal constituent surfaces.
  • the central axis O of the bone portion 2B is the basic central axis O1 (chain line in FIGS. 2 and 3) which is the central axis of the bone portion 2B and the end portion of the basic bone portion 2BA.
  • the basic central axis O1 is further extended in the direction of the basic central axis O1 to intersect the central axis O of the adjacent bone portion 2B with the extended central axis O2 (thick line in FIGS. 2 and 3). Refers to the line connecting the.
  • the central axis O of the basic bone portion 2BA may be, for example, a regular polyhedron or a semi-regular polyhedron other than the truncated octahedron, and may constitute each side of another three-dimensional shape.
  • a regular polyhedron is a convex polyhedron in which all faces are composed of the same regular polygon and the number of faces in contact with all vertices is the same, and is a regular tetrahedron, a regular hexahedron, a regular octahedron, a regular icosahedron, Includes regular tetrahedron.
  • the archimedean solid refers to a convex cube whose faces are composed of two or more types of regular polygons and whose order is the same as the types of regular polygons gathered at the apex.
  • Top octahedron, cut top 12 facet, cut top 20 facet, cubic octahedron, 20/12 facet, oblique cube octahedron, oblique cube 20/12 facet, oblique cut top cube octahedron, oblique cut top Includes 20/12 facets, modified cubes, and modified dodecahedral. In the examples of FIGS.
  • the plurality of basic bone portions 2BA constitute a truncated octahedron (Kelvin tetradecahedron) among the bone portions 2B.
  • the truncated octahedron is a polyhedron composed of six regular hexagonal constituent faces and eight regular hexagonal constituent faces.
  • the basic cell 21 may be a regular polyhedron or a semi-regular polyhedron whose sides are the central axes of each of the plurality of basic bone portions 2BA constituting the basic cell 21.
  • the basic cell 21 forms a truncated octahedron with the central axis of each of the plurality of basic bones 2BA constituting the basic cell 21 as each side. There is.
  • the basic cell 21 is not limited to a truncated octahedron, and may be an arbitrary regular polyhedron such as a regular tetrahedron or a regular hexahedron, or an arbitrary semi-regular polyhedron such as a truncated tetrahedron or a truncated hexahedron. ..
  • the shape is a polyhedron, preferably a regular polyhedron or a semi-regular polyhedron, and more preferably a truncated polyhedron (Kelvin 14-sided body), so that the gap (interval) between the cell holes C constituting the skeleton portion 2 is made smaller. This makes it possible to form more cell holes C inside the skeleton portion 2.
  • the central axis O does not form each side of the regular polyhedron or the semi-regular polyhedron.
  • the central axis O of the bone portions 2B does not form each side of the truncated octahedron (Kelvin tetradecahedron).
  • Each of the plurality of connecting portions 2J connects the end portions 2BAe to each other at a position where the end portions 2BAe of the plurality of (for example, four) basic bone portions 2BA extending in different directions are adjacent to each other.
  • Some of the plurality of joints 2J are a plurality of basic portions where a plurality of (for example, four) end portions 2BAe extending in different directions and an end portion 2BBe of one or more additional bone portions 2BB are adjacent to each other.
  • the end 2BAe of the bone 2BA and the end 2BAe of one or more additional bones 2BB may be coupled.
  • the porous structure 1 includes the skeleton portion 2 almost entirely thereof, it can be compressed / restored and deformed according to the addition / release of an external force while ensuring air permeability, and thus has characteristics as a cushioning material. Becomes good.
  • the structure of the porous structure 1 becomes simple, and it becomes easy to model with a 3D printer.
  • a part or all of the bone portions 2B may extend while being curved.
  • the central axis O of the bone portion 2B may be a line segment connecting the centers of the joint portions 2J adjacent to each other at both ends of the bone portion 2B.
  • part or all of the bone portion 2B is curved, it is possible to prevent a sudden shape change of the bone portion 2B and thus the porous structure 1 at the time of inputting a load, and suppress local buckling. be able to.
  • each bone portion 2B constituting the skeleton portion 2 has a circular (perfect circular) cross-sectional shape. This simplifies the structure of the skeleton portion 2 and facilitates modeling with a 3D printer. In addition, it is easy to reproduce the mechanical properties of a general polyurethane foam produced through a process of foaming by a chemical reaction. Further, by forming the bone portion 2B in a columnar shape in this way, the durability of the skeleton portion 2 can be improved as compared with the case where the bone portion 2B is replaced with a thin film-like portion.
  • the cross-sectional shape of each basic bone portion 2BA is a shape in a cross section perpendicular to the direction in which the basic bone portion 2BA extends.
  • each additional bone portion 2BB is a shape in a cross section perpendicular to the central axis O of the additional bone portion 2BB, respectively.
  • all or part of the bone portions 2B constituting the skeleton portion 2 have a polygonal cross-sectional shape (other than an equilateral triangle and an equilateral triangle). It may be a triangle, a quadrangle, etc.), or a circle other than a perfect circle (an ellipse, etc.), and even in that case, the same effect as in this example can be obtained.
  • each bone portion 2B may have a uniform cross-sectional shape along the extending direction thereof, or may be non-uniform along the extending direction thereof. Further, the cross-sectional shapes of the bone portions 2B may be different from each other.
  • each basic cell 21 has a plurality of (14 in the example of FIG. 4) annular portions 211, respectively.
  • Each of the annular portions 211 is formed in an annular shape, and the flat virtual surface V1 is partitioned by the inner peripheral side edge portions 2111 of the respective annular portions.
  • the plurality of annular portions 211 constituting the basic cell 21 are connected to each other so that the virtual surfaces V1 partitioned by the inner peripheral side edge portions 2111 do not intersect with each other.
  • the cell hole C is partitioned by the basic bone portion 2BA.
  • the cell hole C is partitioned by a plurality of annular portions 211 constituting the basic cell 21 configured by the basic bone portion 2BA, and a plurality of virtual surfaces V1 partitioned by each of the plurality of annular portions 211.
  • the annular portion 211 is a portion that partitions the side of the three-dimensional shape formed by the cell hole C
  • the virtual surface V1 is a portion that partitions the constituent surface of the three-dimensional shape formed by the cell hole C.
  • Each annular portion 211 is composed of a plurality of basic bone portions 2BA and a plurality of connecting portions 2J for connecting the end portions 2BAe of the plurality of basic bone portions 2BA.
  • the connecting portion between the pair of annular portions 211 connected to each other is composed of one basic bone portion 2BA shared by the pair of annular portions 211 and a pair of connecting portions 2J on both sides thereof. .. That is, each basic bone portion 2BA and each connecting portion 2J are shared by a plurality of annular portions 211 adjacent to each other.
  • Each virtual surface V1 has a part of one cell hole C partitioned by one surface of the virtual surface V1 (the surface of the virtual surface V1), and the other surface of the virtual surface V1. A part of another cell hole C is partitioned by (the back surface of the virtual surface V1). In other words, each virtual surface V1 divides a part of separate cell holes C by the surfaces on both the front and back sides thereof.
  • each virtual surface V1 is shared by a pair of cell holes C adjacent to the virtual surface V1 (that is, a pair of cell holes C sandwiching the virtual surface V1).
  • each annular portion 211 is shared by a part of a plurality of basic bone portions 2BA that partition a pair of cell holes C adjacent to the annular portion 211.
  • each virtual surface V1 is not covered by the film 3 (FIG. 5) described later and is open, that is, constitutes an opening. Therefore, the cell holes C are communicated with each other through the virtual surface V1, and ventilation between the cell holes C is possible.
  • the air permeability of the skeleton portion 2 can be improved, and the skeleton portion 2 can be easily compressed / restored and deformed according to the addition / release of an external force.
  • the plurality of (14 in this example) annular portions 211 constituting the basic cell 21 are one or a plurality (six in this example), respectively. It includes a small annular portion 211S and one or more (eight in this example) large annular portions 211L.
  • Each of the small annular portions 211S divides the small virtual surface V1S by the inner peripheral side edge portion 2111 of the annular portion.
  • Each macrocyclic portion 211L divides a large virtual surface V1L having a larger area than the small virtual surface V1S by the inner peripheral side edge portion 2111 of the annular portion.
  • the central axis O of the plurality of basic bones 2BA constituting the macrocyclic portion 211L has a regular hexagonal shape, and accordingly, the large virtual surface V1L also has a substantially regular hexagonal shape. Is doing.
  • the central axis O of the plurality of basic bone portions 2BA constituting the small annular portion 211S has a regular quadrangle, and accordingly, the small virtual surface V1S also has a substantially regular quadrangle.
  • the small virtual surface V1S and the large virtual surface V1L differ not only in area but also in shape.
  • Each macrocyclic portion 211L has a plurality of (six in this example) basic bones 2BA and a plurality of (six in this example) connecting the end 2BAes of the plurality of basic bones 2BA. It is composed of a connecting portion 2J and.
  • Each of the small annular portions 211S has a plurality of (four in this example) basic bone portions 2BA and a plurality of (four in this example) connecting the end portions 2BAe of the plurality of basic bone portions 2BA. It is composed of a connecting portion 2J and.
  • the central axis O (and by extension, the basic) of a plurality of basic bone portions 2BA constituting a part or all (all in this example) annular portions 211.
  • a part or all (all in this example) virtual surface V1) has a substantially polygonal shape, so that the shape of the annular portion 211 (and thus the shape of the virtual surface V1). Is simplified, so the manufacturability and ease of adjusting the characteristics can be improved.
  • At least one annular portion 211 (by extension, at least one virtual surface V1 among each virtual surface V1 constituting the skeleton portion 2) of each annular portion 211 constituting the skeleton portion 2 satisfies this configuration. If so, the same effect can be obtained, although the degree may vary.
  • the rigidity of the basic cell 21 in at least one axial direction of the XYZ Cartesian coordinate system is larger than the rigidity of the basic cell 21 in at least one other axial direction.
  • the rigidity refers to the difficulty of deformation when an external force is applied to the basic cell 21, and is required to compress the basic cell 21 by 25% in an environment of a temperature of 23 ° C. and a relative humidity of 50%.
  • the load (N) is measured, the hardness is 25%, which is the measured value.
  • the "two adjacent basic bones 2BA" can include two adjacent basic bones 2BA via the joint 2J as shown in FIGS. 1 to 4.
  • the additional bone portion 2BB included in the basic cell 21 extends without any other component in the XYZ Cartesian coordinate system in at least one axial direction (Z-axis direction).
  • the central axis O of the additional bone portion 2BB extends by connecting two vertices of a regular polyhedron or a semi-regular polyhedron (in the example of FIG. 4, a truncated octahedron (Kelvin tetradecahedron)).
  • the additional bone portion 2BB has at least one axial direction (X-axis direction and Y-axis direction). Will extend without any other components in at least one axial direction (Z-axis direction).
  • the central axis O of the additional bone portion 2BB extends by connecting two vertices of a regular polyhedron or a semi-regular polyhedron (in the example of FIG. 4, a truncated octahedron (Kelvin tetradecahedron)).
  • the central axis O of the additional bone portion 2BB is the two opposite vertices of the truncated octahedron (Kelvin tetradecahedron), that is, one vertex and the same basic cell 21 as the one vertex. In, the vertex at the position farthest from the one vertex is connected and extended.
  • the basic cell 21 includes two additional bone portions 2BB, one of the two additional bone portions 2BB extends in the X-axis direction, and the other of the two additional bone portions 2BB extends in the Y-axis direction. Further, the two additional bone portions 2BB are orthogonal to each other and form a cross shape when viewed from the Z-axis direction.
  • the additional bone portion 2BB of the basic cell 21 has components in at least one axial direction (X-axis direction and Y-axis direction in this example), and at least one other axial direction (Z-axis direction in this example). Does not have the ingredients of.
  • the additional bone portion 2BB has at least one other axial direction (in this example, the Z-axis direction) in at least one axial direction (in this example, the X-axis direction and the Y-axis direction) in which the additional bone portion 2BB extends. Further, the deformation of the basic cell 21 with respect to an external force is reduced, and the basic cell 21 is made difficult to be deformed. Therefore, when the basic cell 21 includes an additional bone portion 2BB in addition to the basic bone portion 2BA constituting each side of the regular polyhedron or the semi-regular polyhedron, when the basic cell 21 is composed of only the basic bone portion 2BA.
  • the rigidity of the basic cell 21 in at least one axial direction is larger than that in the other at least one axial direction (in this example, the Z-axis direction). ..
  • the direction in which the additional bone portion 2BB extends has components in the X-axis direction and the Y-axis direction and does not have a component in the Z-axis direction, but for example, the direction in which the additional bone portion 2BB extends. May have only components in the X-axis direction.
  • the additional bone portion 2BB reduces the deformation of the basic cell 21 with respect to the external force in the X-axis direction in which the additional bone portion 2BB extends from the Y-axis direction and the Z-axis direction, making the basic cell 21 less likely to be deformed. That is, the rigidity of the basic cell 21 in the X-axis direction is larger than the rigidity in the Y-axis direction and the rigidity in the Z-axis direction. Further, in the examples of FIGS. 1 to 4, the direction in which the additional bone portion 2BB extends has components in the X-axis direction and the Y-axis direction and does not have a component in the Z-axis direction, but for example, the Z-axis direction.
  • the direction in which the additional bone portion 2BB extends has components in the Z-axis direction and the X-axis direction, and does not have to have the components in the Y-axis direction, and the components in the Z-axis direction and the Y-axis direction. It does not have to have a component in the X-axis direction. Further, in the examples of FIGS.
  • the direction in which the additional bone portion 2BB extends may have a Z-axis component, and in this case, the components in the X-axis direction and the Y-axis direction in the direction in which the additional bone portion 2BB extends are: It is larger than the component in the Z-axis direction. Further, when the direction in which the additional bone portion 2BB extends has a Z-axis component, the component in the X-axis direction in the direction in which the additional bone portion 2BB extends may be larger than the components in the Y-axis direction and the Z-axis direction. In the examples of FIGS.
  • the additional bone portion 2BB extends along either the X-axis direction or the Y-axis direction, but has a component in either the X-axis direction or the Y-axis direction.
  • the component in either the X-axis direction or the Y-axis direction of the additional bone portion 2BB may be larger than the component in the Z-axis direction.
  • the total volume of the additional bone portion 2BB constituting the basic cell 21 can be 0.5 times or less the total volume of the basic bone portion 2BA constituting the basic cell 21.
  • the total volume of the additional bone 2BB constituting the basic cell 21 is 0.5 times or less the total volume of the basic bone 2BA constituting the basic cell 21, the total volume is larger than 0.5 times, as compared with the case where the total volume is larger than 0.5 times.
  • the rigidity of the basic cell 21 in the direction in which the additional bone portion 2BB extends does not become too large, and it is easy to bend due to an external force.
  • the basic cell 21 maintains an appropriate cushioning property even in at least one axial direction (in this example, the X-axis direction and the Y-axis direction), which is the direction in which the additional bone portion 2BB extends, in the at least one axial direction (in this example).
  • the rigidity of the basic cell 21 in the X-axis direction and the Y-axis direction) is larger than the rigidity of the basic cell 21 in at least one other axial direction (Z-axis direction in this example).
  • the porous structure 1 composed of the basic cells 21 of this example has at least one axial direction (X-axis direction and Y-axis direction in this example), that is, a specific direction while maintaining an appropriate cushioning property. It is possible to suppress lateral displacement to.
  • the total volume of the additional bone portion 2BB constituting the basic cell 21 may be larger than 0.5 times the total volume of the basic bone portion 2BA constituting the basic cell 21.
  • FIG. 5 is a drawing corresponding to FIG. 4, and is a perspective view showing a first modification example of the basic cell 21.
  • the additional bone portion 2BB extends within the virtual surface V1 that partitions the annular portion 211.
  • the additional bone portion 2BB of this example extends in the X-axis direction or the Y-axis direction within the large virtual surface V1L that partitions the macrocyclic portion 211L, and connects two vertices facing each other on the large virtual surface V1.
  • the additional bone 2BB of this example extends within all the large virtual surfaces V1L of the basic cell 21, but the additional bone 2BB is not limited to this, and the additional bone 2BB is one or more large of the basic cell 21. It may extend within the virtual surface V1L.
  • the additional bone portion 2BB extends within the large virtual surface V1L that partitions the macrocyclic portion 211L, but is not limited to this, and may extend within the small virtual surface V1S that partitions the small annular portion 211S. ..
  • the additional bone portion 2BB extends in the X-axis direction or the Y-axis direction within the small virtual surface V1S that partitions the small annular portion 211S, and can connect two vertices facing each other on the small virtual surface V1S. At this time, the additional bone portion 2BB can extend within one or more large virtual surfaces V1L possessed by the basic cell 21.
  • the XYZ Cartesian coordinate system similar to the XYZ Cartesian coordinate system shown in the example of FIG. 4 is virtually fixed in the porous structure 1 of the example of FIG. 5 as in the example of FIG. 4, the XYZ Cartesian coordinate system is virtually fixed.
  • the rigidity of the basic cell 21 in at least one axial direction (X-axis direction and Y-axis direction in the above example) of the coordinate system is that of the basic cell 21 in at least one other axial direction (Z-axis direction in the above example). Greater than rigidity.
  • the total volume of the additional bone portion 2BB constituting the basic cell 21 is 0.5 of the total volume of the basic bone portion 2BA constituting the basic cell 21. It can be doubled or less.
  • the basic cell 21 has an appropriate cushion even in at least one axial direction (X-axis direction and Y-axis direction in the example of FIG. 5) in which the additional bone portion 2BB extends.
  • the rigidity of the basic cell 21 in at least one axial direction is in the other at least one axial direction (Z-axis direction in the example of FIG. 5) while maintaining the property. It is larger than the rigidity of the basic cell 21.
  • the porous structure 1 composed of the basic cells 21 of the example of FIG. 5 has at least one axial direction (X in the example of FIG. 5) while maintaining an appropriate cushioning property as in the example of FIG. Axial direction and Y-axis direction), that is, lateral displacement in a specific direction can be suppressed.
  • the total volume of the additional bone portion 2BB constituting the basic cell 21 is 0.5 of the total volume of the basic bone portion 2BA constituting the basic cell 21 as in the example of FIG. It may be larger than double.
  • FIG. 6 is a drawing corresponding to FIG. 4, and is a perspective view showing a second modification of the basic cell 21.
  • the basic bone 2BA included in the basic cell 21 in the porous structure 1 includes a standard basic bone 2BAS and a thick basic bone 2BAF having different average cross-sectional areas from each other.
  • At least one of the thick basic bones 2BAF has at least one axial direction of the XYZ Cartesian coordinate system (example of FIG. 6) when a XYZ Cartesian coordinate system similar to the XYZ Cartesian coordinate system shown in the example of FIG. 4 is virtually fixed.
  • the average cross-sectional area of the standard basic bone 2BAS is the average value of the cross-sectional areas of the cross section perpendicular to the central axis of the standard basic bone 2BAS (that is, the volume of the standard basic bone 2BAS is the standard basic bone 2BAS. (Value divided by the extended length of).
  • the average cross-sectional area of the thick basic bone 2BAF is the average cross-sectional area of the cross section perpendicular to the central axis of the thick basic bone 2BAF (that is, the volume of the thick basic bone 2BAF is the extension of the thick basic bone 2BAF). (Value divided by length).
  • the cross-sectional area of each standard basic bone 2BAS is constant over the entire length of the standard basic bone 2BAS (that is, uniform along the extending direction of the standard basic bone 2BAS).
  • the cross-sectional area of any part of the standard basic bone 2BAS is the average cross-sectional area.
  • each standard basic bone 2BAS may be non-uniform along the extending direction of the standard basic bone 2BAS.
  • a part or all of the standard basic bone 2BAS of each standard basic bone 2BAS may gradually increase or decrease toward both ends 2BASe in the extending direction of the standard basic bone 2BAS.
  • the cross-sectional area of each thick basic bone 2BAF is constant over the entire length of the thick basic bone 2BAF (that is, uniform along the extending direction of the thick basic bone 2BAF). Therefore, the cross-sectional area of any part of each thick basic bone 2BAF is the average cross-sectional area.
  • each thick basic bone 2BAF may be non-uniform along the extending direction of the thick basic bone 2BAF.
  • a part or all of the thick basic bone 2BAF of each thick basic bone 2BAF may gradually increase or decrease toward both ends 2BAFe in the extending direction of the thick basic bone 2BAF.
  • the thick basic bone 2BAF extends with components in at least one axial direction (X-axis direction and Y-axis direction in the example of FIG. 6), and extends in at least one other axial direction (in the example of FIG. 6).
  • the average cross-sectional area is larger than the average cross-sectional area of the standard basic bone 2BAS, so that the thick basic bone 2BAF extends.
  • the deformation of the basic cell 21 with respect to an external force is reduced as compared with the other at least one axial direction (Z-axis direction in the example of FIG. 6). This makes the basic cell 21 less likely to be deformed. Therefore, the rigidity in at least one axial direction (in the example of FIG. 6, the X-axis direction and the Y-axis direction) is larger than the rigidity in the other at least one axial direction (in the example of FIG. 6, the Z-axis direction).
  • the average cross-sectional area of the thick basic bone 2BAF can be 1.1 to 2.0 times the average cross-sectional area of the standard basic bone 2BAS.
  • the rigidity of the basic cell 21 in the direction in which the additional bone 2B extends is larger than that in the case where the average cross-sectional area of the thick basic bone 2BAF is larger than 2.0 times the average cross-sectional area of the standard basic bone 2BAS. It does not become too much and is easily bent by external force. Therefore, the basic cell 21 maintains an appropriate cushioning property in at least one axial direction (X-axis direction and Y-axis direction in the example of FIG. 6) in which the additional bone portion 2BB extends, and in the at least one axial direction.
  • the rigidity of the basic cell 21 in (X-axis direction and Y-axis direction in the example of FIG. 6) is made larger than the rigidity of the basic cell 21 in at least one other axial direction (Z-axis direction in the example of FIG. 6). be able to. Further, the rigidity of the basic cell 21 in the direction in which the additional bone portion 2B extends is larger than that in the case where the average cross-sectional area of the thick basic bone portion 2BAF is smaller than 1.1 times the average cross-sectional area of the standard basic bone portion 2BAS. can do. As a result, the porous structure 1 composed of the basic cells 21 of the example of FIG. 6 has at least one axial direction (X-axis direction and Y-axis direction in the example of FIG.
  • the average cross-sectional area of the thick basic bone 2BAF may be larger than 2.0 times the average cross-sectional area of the standard basic bone 2BAS. In this case, the average cross-sectional area of the thick basic bone 2BAF is the standard basic bone. In at least one axial direction (in the example of FIG. 6, the X-axis direction and the Y-axis direction), which is the direction in which the additional bone portion 2BB extends, as compared with the case where the average cross-sectional area of the portion 2BAS is 1.1 to 2.0 times.
  • the rigidity of the basic cell 21 is larger than the rigidity of the basic cell 21 in at least one other axial direction (Z-axis direction in the example of FIG. 6).
  • the porous structure 1 composed of the basic cells 21 of the example of FIG. 6 suppresses lateral displacement in at least one axial direction (X-axis direction and Y-axis direction in the example of FIG. 6), that is, in a specific direction. can do.
  • the average cross-sectional area of the standard basic bones 2BAS is suitably 0.01 ⁇ 0.3 cm 2, and more preferably 0.03 ⁇ 0.15 cm 2.
  • the average cross-sectional area of the thick base bones 2BAF is suitably 0.01 ⁇ 0.3 cm 2, and more preferably 0.03 ⁇ 0.15 cm 2.
  • the average cross-sectional area of the additional bone 2BB is, 0.03 ⁇ 0.3 cm 2 are preferred, and more preferably 0.03 ⁇ 0.15 cm 2.
  • the thick basic bone portion 2BAF is a basic bone portion 2BA that does not partition the small annular portion 211S among the basic bone portions 2BA extending without having a component in the Z-axis direction.
  • the thick basic bone portion 2BAF may be the basic bone portion 2BA that partitions the small annular portion 211S among the basic bone portions 2BA extending without having a component in the Z-axis direction.
  • the thick basic bone portion 2BAF extends without having a component in the Z-axis direction, but even if it extends without having a component in the Y-axis direction in addition to the Z-axis direction. Good.
  • the thick basic bone 2BAF reduces the deformation of the basic cell 21 due to an external force only in the direction other than the Z-axis direction, that is, the X-axis direction, and deforms the basic cell 21 only in the X-axis direction. Make it difficult. Therefore, the rigidity of the porous structure 1 in the X-axis direction is larger than the rigidity in the Z-axis direction and the Y-axis direction. Further, in the example of FIG. 6, the thick basic bone portion 2BAF extends without having a component in the Z-axis direction, but may extend without having a component in the X-axis direction or the Y-axis direction, for example. Good. Further, in the example of FIG.
  • the basic bone portion 2BA includes the standard basic bone portion 2BAS and the thick basic bone portion 2BAF, but in addition to or in place of this, a part or all of the additional bone portion 2BB.
  • the average cross-sectional area of is larger than the average cross-sectional area of the standard basic bone 2BAS.
  • the XYZ Cartesian coordinate system similar to the XYZ Cartesian coordinate system shown in the example of FIG. 4 is virtually fixed in the basic cells 21 of each example shown in FIGS. 4 to 6, the XYZ Cartesian coordinate system is used.
  • the rigidity of the basic cell 21 in at least one axial direction is the Z-axis in at least one other axial direction (in each example of FIGS. 4 to 6). It is larger than the rigidity of the basic cell 21 in the direction).
  • the porous structure 1 includes a repeating structure of the basic cell 21.
  • the porous structure 1 is in at least one axial direction in the XYZ Cartesian coordinate system (in the example of the porous structure including the basic cells 21 of each of the examples of FIGS. 4 to 6, the X-axis direction and the Y-axis direction). Is larger than the rigidity in at least one other axial direction (Z-axis direction in the example of the porous structure including the basic cell 21 of each example of FIGS. 4 to 6).
  • the porous structure 1 is moved in at least one axial direction (in the example of the porous structure including the basic cells 21 of each of the examples of FIGS. 4 to 6, the X-axis direction and the Y-axis direction), that is, in a specific direction. It is possible to suppress the lateral displacement of.
  • FIG. 7 shows the distribution of the total volume of the additional bone portion in the cross section parallel to the XY plane, which shows a modification of the porous structure 1 shown in FIG.
  • the porous structure 1 has a repeating structure in which the same basic cells 21 as the basic cells 21 of the example of FIG. 4 are repeatedly connected in each direction of XYZ, but in this example, The porous structure 1 has a repeating structure in which basic cells 21 having different numbers of bone portions 2B or average cross-sectional areas are connected in each direction of XYZ.
  • FIG. 7 shows the distribution of the total volume of the additional bone portion in the cross section parallel to the XY plane, which shows a modification of the porous structure 1 shown in FIG.
  • the porous structure 1 has a repeating structure in which the same basic cells 21 as the basic cells 21 of the example of FIG. 4 are repeatedly connected in each direction of XYZ, but in this example, The porous structure 1 has a repeating structure in which basic cells 21 having different numbers of bone portions 2B or average cross-
  • the total volume of the bone portion 2B constituting the basic cell 21 is larger than that of the basic cell 21 located on the outer surface side in at least one axial direction in which the rigidity of the basic cell 21 is large.
  • the rigidity of the basic cell 21 in the X-axis direction is greater than the rigidity in the Y-axis direction and the Z-axis direction
  • the total volume of 2B can be made as large as the basic cell 21 located on the outer surface side in the X-axis direction. For example, as shown in FIG.
  • the porous structure 1 is the outermost region in the X-axis direction, the central region R1 which is the region closest to the center, and the intermediate region R2 located on the outer surface side of the central region R1.
  • the total volume of the bone portion 2B of the basic cell 21 included in the central region R1 is the smallest
  • the total volume of the bone portion 2B of the basic cell 21 included in the intermediate region R2 is the smallest. Is larger than the total volume of the bone 2B of the basic cell 21 included in the central region R1, and the total volume of the bone 2B of the basic cell 21 included in the outer region R3 is larger than the total volume of the bone 2B of the intermediate region R2. It's getting bigger.
  • the porous structure 1 is described by dividing it into five regions in the X-axis direction, but the present invention is not limited to this, and the porous structure 1 is divided into three or more regions on the outer surface side.
  • the basic cell 21 in the located region may be configured to increase the total volume of the bone portion constituting the basic cell 21.
  • the rigidity of the porous structure 1 is higher in the region located on the outer surface side and lower in the region located inside. Therefore, the porous structure 1 can maintain the cushioning property as a whole by making it easier to bend inside while suppressing the lateral displacement of the porous structure 1 on the outer surface side.
  • FIG. 8 is a drawing corresponding to FIG. 4, and is a drawing for explaining a third modification example of the basic cell 21.
  • the basic cell 21 may include one or more membranes 3 in addition to the bone portion 2B of the example of FIG.
  • the film 3 extends on the virtual surface V1 partitioned by the annular inner peripheral edge 2111 of the annular portion 211, thereby covering the virtual surface V1 partitioned by the annular portion 211.
  • at least one of the virtual surfaces V1 constituting the skeleton portion 2 is covered with the film 3.
  • the film 3 is made of the same material as the skeleton portion 2 and is integrally formed with the skeleton portion 2.
  • the film 3 is formed flat.
  • the film 3 may be configured to be non-flat (for example, curved (curved)). It is preferable that the membrane 3 has a thickness smaller than the width of the bone portion 2B integrally formed with the membrane 3. Due to the membrane 3, the two cell holes C sandwiching the virtual surface V1 are in a non-communication state, and as a result, the overall air permeability of the porous structure 1 is lowered. By adjusting the number of virtual surfaces V1 constituting the porous structure 1 that are covered with the membrane 3, the overall air permeability of the porous structure 1 can be adjusted, and various types can be obtained as required. Breathability levels can be achieved.
  • the porous structure 1 when used as a cushion material for a seat, for example, a seat pad for a vehicle, the effectiveness of the air conditioner in the vehicle may be enhanced by adjusting the air permeability of the porous structure 1. , The stuffiness resistance can be improved and the riding comfort can be improved.
  • the porous structure 1 is used as a cushion material for a seat, for example, a seat pad for a vehicle, the porous structure is improved from the viewpoint of enhancing the effectiveness and stuffiness resistance of the air conditioner in the vehicle and enhancing the usability. It is not preferable that all of the virtual surfaces V1 constituting the body 1 are covered with the membrane 3, in other words, at least one of the virtual surfaces V1 constituting the porous structure 1 is covered with the membrane 3.
  • the conventional porous structure is manufactured through a step of foaming by a chemical reaction, it is difficult to form a film in a communication hole that connects each cell at the desired position and number. ..
  • the porous structure 1 is manufactured by a 3D printer as in this example, by including the information of the film 3 in advance in the 3D modeling data read by the 3D printer, the position is surely as expected. It is possible to form the film 3 by the number and the number. From the same viewpoint, at least one of the first small virtual surfaces V1S constituting the skeleton portion 2 may be covered with the film 3. And / or at least one of the first large virtual surfaces V1L constituting the skeleton portion 2 may be covered with the film 3.
  • the skeleton portion 2 has at least one cell hole C having a diameter of 5 mm or more. This facilitates the production of the porous structure 1 using a 3D printer. If the diameter of each cell hole C of the skeleton portion 2 is less than 5 mm, the structure of the skeleton portion 2 becomes too complicated, and as a result, three-dimensional shape data (CAD data, etc.) representing the three-dimensional shape of the porous structure 1 Alternatively, it may be difficult to generate 3D modeling data generated based on the 3D shape data on a computer, or even if they can be generated, the 3D printer will model according to the 3D modeling data. May be difficult.
  • the conventional porous structure having cushioning properties was manufactured through a step of foaming by a chemical reaction, it was not possible to form a cell hole C having a diameter of 5 mm or more. Further, since the skeleton portion 2 has the cell hole C having a diameter of 5 mm or more, it becomes easy to improve the air permeability and the easiness of deformation of the skeleton portion 2. From this point of view, it is preferable that the diameters of all the cell holes C constituting the skeleton portion 2 are 5 mm or more, respectively. The larger the diameter of the cell hole C, the easier it is to manufacture the porous structure 1 using a 3D printer, and it becomes easier to improve the air permeability and the easiness of deformation.
  • the diameter of at least one (preferably all) cell holes C in the skeleton portion 2 is more preferably 8 mm or more, still more preferably 10 mm or more.
  • the cell hole C of the skeleton portion 2 is too large, it becomes difficult to form the outer edge (outer contour) shape of the skeleton portion 2 (and thus the porous structure 1) neatly (smoothly).
  • the porous structure When 1 is applied to a cushion material for a seat, for example, a seat pad for a vehicle, the shape accuracy may be lowered and the appearance may be deteriorated. In addition, the characteristics of the cushion material may not be sufficiently good.
  • the diameter of each cell hole C of the skeleton portion 2 is preferably less than 30 mm, more preferably 25 mm or less, and further preferably 20 mm or less. ..
  • the diameter of the cell hole C refers to the diameter of the circumscribed sphere of the cell hole C when the cell hole C has a shape different from the exact spherical shape as in this example. If the cell hole C of the skeleton portion 2 is too small, the structure of the skeleton portion 2 becomes too complicated, and as a result, three-dimensional shape data (CAD data or the like) representing the three-dimensional shape of the porous structure 1 or its three-dimensional shape.
  • the diameter of the cell hole C having the smallest diameter among the cell holes C constituting the skeleton portion 2 is 0.05 mm or more. It is more preferable, and it is more preferable that it is 0.10 mm or more.
  • the diameter of the cell hole C having the minimum diameter is 0.05 mm or more, it is possible to model with the resolution of a high-performance 3D printer, and when it is 0.10 mm or more, not only a high-performance 3D printer but also a general-purpose 3D It can also be modeled at the resolution of the printer.
  • each bone portion 2B constituting the skeleton portion 2 is formed of the same material.
  • the material of each bone portion 2B constituting the skeleton portion 2 does not have to be the same.
  • the material of a part of the bone portion 2B may be different from that of the other bone portion 2B.
  • the rigidity of the porous structure 1 in at least one axial direction of the XYZ Cartesian coordinate system is increased in the other at least one axial direction. It can be made larger than the rigidity of the porous structure 1 in the above.
  • the width of the bone portion 2B specifically, from the viewpoint of simplification of the structure of the skeleton portion 2, and thus the ease of manufacturing the porous structure 1 by the 3D printer.
  • Width W1 of basic bone 2BA (FIGS. 4 and 5), width W2 of additional bone 2BB (FIGS. 4 and 5), width W1S of standard basic bone 2BAS (FIG. 6), width of thick basic bone 2BAF
  • Each width W1F (FIG. 6) is preferably 0.05 mm or more, and more preferably 0.10 mm or more.
  • width W0 is 0.05 mm or more
  • modeling is possible with the resolution of a high-performance 3D printer
  • the width W0 is 0.10 mm or more
  • modeling is possible not only with the resolution of a high-performance 3D printer but also with the resolution of a general-purpose 3D printer.
  • the porous structure 1 when used for a vehicle seat pad, the porous structure is improved from the viewpoint of enhancing the effectiveness and stuffiness resistance of the air conditioner in the vehicle and enhancing the usability.
  • breathable body 1 is suitably 100 ⁇ 700cc / cm 2 / sec , 150 ⁇ 650cc / cm 2 / sec is more preferred, 200 ⁇ 600cc / cm 2 / sec is more preferred.
  • the air permeability (cc / cm 2 / sec) of the porous structure 1 shall be measured in accordance with JIS K 6400-7.
  • the resonance magnification of the porous structure 1 is preferably 3 times or more and less than 8 times, and more preferably 3 times or more and 5 times or less.
  • the direction in which the basic bone portion 2BAx extends is defined as the X-axis direction and the direction in which the basic bone portion 2BAy extends is defined as the Y-axis direction shown in each of the drawings of FIGS. 4 to 6.
  • the direction in which the basic bone 2BAx extends is defined as the X-axis direction shown in each of FIGS. 4 to 6, and the virtual plane including the basic bone 2BAx and, for example, the basic bone 2BAw is the XY plane.
  • the basic cell 21 When the direction in the plane XY plane orthogonal to the X-axis direction is the Y-axis direction, the basic cell 21 has, for example, either the X-axis direction or the Y-axis direction, and has the Z-axis. It may have at least one or more additional bones 2BB that have no directional component (ie, do not extend in the Z-axis direction). Further, in the basic cell 21, for example, at least one or more of the plurality of basic bone portions 2BA extending in the direction having any of the components in the X-axis direction and the Y-axis direction (that is, not extending in the Z-axis direction). The basic bone 2BA may be used as the thick basic bone 2BAF.
  • the basic cell 21 has, for example, at least one or more components having components in the X-axis direction and no components in the Y-axis direction and the Z-axis direction (that is, not extending in the Y-axis direction and the Z-axis direction). It may have an additional bone 2BB. Further, in the basic cell 21, for example, among the plurality of basic bone portions 2BA, the component in the X-axis direction is provided and the components in the Y-axis direction and the Z-axis direction are not present (that is, the Y-axis direction and the Z-axis). At least one or more basic bones 2BA (which do not extend in the direction) may be the thick basic bones 2BAF.
  • the porous structure of the present invention is preferably used as a cushioning material, more preferably used as a cushioning material for seats, and further preferably used as a headrest for vehicles. Suitable.
  • FIG. 9 shows a vehicle seat pad (cushion material for a seat) 300 provided with the porous structure 1 of the example of FIG.
  • the vehicle seat pad 300 in the example of FIG. 9 includes a cushion pad 310 for the seated person to sit on, a back pad 320 for supporting the seated person's back, and a headrest 340 for supporting the seated person's head. (Headrest for vehicles) and.
  • FIG. 9 shows a vehicle seat pad (cushion material for a seat) 300 provided with the porous structure 1 of the example of FIG.
  • the vehicle seat pad 300 in the example of FIG. 9 includes a cushion pad 310 for the seated person to sit on, a back pad 320 for supporting the seated person's back, and a headrest 340 for supporting the seated person's head.
  • the cushion pad 310 has a main pad portion 311 configured to rest the buttocks and thighs of the seated person, and a pair of side pad portions 312 located on the left and right sides of the main pad portion 311.
  • the back pad 320 has a main pad portion 321 configured to support the back and waist of the seated person, and a pair of side pad portions 322 located on the left and right sides of the main pad portion 321.
  • the headrest 340 has a head pad portion 341 configured to support the occipital region of the seated person and an ear pad portion 342 configured to support the temporal region of the seated person, particularly the ears. ..
  • the cushion pad 310, the back pad 320, and the headrest 340 are each composed of separate porous structures (as separate members).
  • the headrest 340 includes a porous structure 1 of any of the examples described with reference to FIGS. 1-8.
  • one or more of the cushion pad 310 and the back pad 320 may include the porous structure 1 of any of the examples described with reference to FIGS. 1 to 8, which is formed by a 3D printer. However, it may be formed through a conventional step of foaming by a chemical reaction in mold molding or the like.
  • the head pad portion 341 of the head rest 340 has two in-plane directions whose normal direction is the direction facing the seated person's head, respectively, with respect to the substantially X-axis of the porous structure of FIG. It can be configured to correspond to the direction and the substantially Y-axis direction.
  • the head pad portion 341 has the left-right direction of the head pad portion 314 corresponding to the substantially X-axis direction of the porous structure 1 of FIG. 1, and the vertical direction of the head pad portion 341 is an example of FIG. It can be configured so as to correspond to the substantially Y-axis direction of the porous structure 1 of the above.
  • the head pad made of the porous structure 1 is formed.
  • the portion 341 firmly supports the seated person's head, and can suppress the swaying of the seated person's head in the left-right direction or the vertical direction when the seated person is seated on the cushion pad 310.
  • the cushion pad 310 is composed of the porous structure 1 of any of the above-described examples, the cushion pad 310 is in-plane with the direction facing the buttock and thigh of the seated person as a normal.
  • the two directions orthogonal to each other in the example of FIG. 9, the left-right direction and the front-back direction
  • the cushion pad 310 composed of the porous structure 1 firmly supports the buttocks and thighs of the seated person, and when the seated person is seated on the cushion pad 310, the left-right direction and the front-back direction.
  • a part of the cushion pad 310 may be composed of the porous structure 1 of any of the above-mentioned examples.
  • a part of the main pad portion 311 of the cushion pad 310 may be composed of the porous structure 1.
  • the main pad portion 311 of the cushion pad 310 is loaded into the seat body and the seat body, and faces the thigh or buttocks of the seated person when the seated person is seated, similarly to the headrest 340 described above. And may be provided.
  • the loader firmly supports the thigh or buttocks of the seated person, and the seat body is costly by using a manufacturing method such as foaming by a chemical reaction in, for example, conventional mold molding or the like. Can be reduced.
  • the back pad 320 is composed of the porous structure 1 of any of the above examples, the back pad 320 is in-plane with the direction facing the back and waist of the seated person as a normal.
  • the two directions orthogonal to each other in the example of FIG. 9, the left-right direction and the substantially up-down direction
  • the cushion pad 310 composed of the porous structure 1 firmly supports the back and waist of the seated person, and in the left-right direction and substantially up-down direction when the seated person is seated on the cushion pad 310. It is possible to suppress the shaking of the buttocks and thighs of the seated person.
  • a part of the back pad 320 may be composed of the porous structure 1 of any of the above-mentioned examples.
  • the main pad portion 321 of the back pad 320 is loaded into the seat body and the seat body as in the headrest 340 described above, and when the seated person is seated, the loading is opposed to the back and waist of the seated person. It may have a body. In this case, while the loading body firmly supports the back and waist of the seated person, the cost is reduced by using a manufacturing method such as foaming by a chemical reaction in the seat body, for example, in conventional mold molding or the like. can do.
  • the method for producing the porous structure 1 of the present invention will be illustrated and described with reference to FIG.
  • the method described below can be used to manufacture a vehicle headrest constructed of the porous structure 1 of any of the examples described herein. It can also be used to manufacture the cushion pad 310 and the back pad 320 made of the above-mentioned porous structure 1.
  • a computer is used to create three-dimensional shape data (for example, three-dimensional CAD data) representing the three-dimensional shape of the porous structure 1.
  • the above three-dimensional shape data is converted into 3D modeling data 500 using a computer.
  • the 3D modeling data 500 is read by the control unit 410 of the 3D printer 400 when the modeling unit 420 of the 3D printer 400 performs modeling, and the control unit 410 adds the porous structure 1 to the modeling unit 420. , It is configured to be modeled.
  • the 3D modeling data 500 includes, for example, slice data representing the two-dimensional shape of each layer of the porous structure 1.
  • the porous structure 1 is modeled by the 3D printer 400.
  • the 3D printer 400 may perform modeling using any modeling method such as a stereolithography method, a powder sintering lamination method, a hot melt lamination method (FDM method), or an inkjet method. From the viewpoint of productivity, the stereolithography method is preferable.
  • the 3D printer 400 is for mounting, for example, a control unit 410 configured by a CPU or the like, a modeling unit 420 that performs modeling under the control of the control unit 410, and a modeled object (that is, the porous structure 1) to be modeled. It includes a support base 430, a liquid resin LR, a support base 430, and an accommodating body 440 in which a modeled object is housed.
  • the modeling unit 420 has a laser irradiator 421 configured to irradiate an ultraviolet laser beam LL when a stereolithography method is used as in this example.
  • the housing 440 is filled with a liquid resin LR.
  • the liquid resin LR When the liquid resin LR is exposed to the ultraviolet laser light LL emitted from the laser irradiator 421, the liquid resin LR is cured and becomes a flexible resin.
  • the control unit 410 reads the 3D modeling data 500, and based on the three-dimensional shape included in the read 3D modeling data 500, the modeling unit 420 receives an ultraviolet laser beam. While controlling to irradiate LL, each layer is sequentially modeled (modeling step).
  • the porous structure 1 is made of resin
  • the porous structure 1 as a modeled object may be heated in an oven after the modeling by the 3D printer 400 is completed.
  • the bond between the layers constituting the porous structure 1 can be strengthened, thereby reducing the anisotropy of the porous structure 1, so that the characteristics of the porous structure 1 as a cushioning material can be further improved. ..
  • the porous structure 1 as a model may be vulcanized after the modeling by the 3D printer 400 is completed.
  • the porous structure 1 including the basic bone 2BA and the additional bone 2BB, and the basic bone 2BA become the standard basic bone 2BAS and the thick basic bone.
  • the porous structure 1 and the like including the part 2BAF can be realized easily, accurately, and as expected in one step.
  • the porous structure 1 as a model may be vulcanized after the modeling by the 3D printer 400 is completed.
  • FIG. 11 is a drawing corresponding to FIG. 1, and is a perspective view showing a part of a modified example of the porous structure.
  • FIG. 12 is a D arrow view showing a state in which the C portion surrounded by a broken line in the porous structure 1 of FIG. 11 is viewed from the direction of the D arrow of FIG.
  • FIG. 13 is a view taken along the E arrow showing the C portion of the porous structure 1 of FIG. 11 as viewed from the direction of the E arrow.
  • the porous structure 1 includes an epidermis portion 6 in addition to the skeleton portion 2.
  • the skeleton portion 2 may have any of the basic cells 21 of each of the examples of FIGS. 4 to 6.
  • the porous structure 1 may or may not include the above-mentioned film 3 (FIG. 12).
  • the configurations of the skeleton portion 2 and the membrane 3 are as described above.
  • the porous structure 1 in this example can form the headrest 340 (headrest for a vehicle) in the example of FIG. In this case, it is preferable that the outermost side of the headrest 340 is composed of the skin portion 6.
  • the porous structure 1 in this example may constitute at least one of the cushion pad 310 and the back pad 320 in the example of FIG.
  • the outermost side of the cushion pad 310 and the back pad 320 is composed of the skin portion 6.
  • the epidermis portion 6 is integrally formed with the skeleton portion 2 so as to cover a part or all of the outer surface of the skeleton portion 2 (the virtual surface forming the outer edge (outer contour) of the skeleton portion 2). It is composed of the same material as.
  • the skin portion 6 constitutes a part or all of the outer surface of the porous structure 1. In the portion of the porous structure 1 shown in FIG. 11, the skin portion 6 is formed in a flat shape, but the skin portion 6 may be formed in an arbitrary shape along the outer surface of the skeleton portion 2, for example. It may be configured in a curved shape (curved surface shape).
  • the skin portion 6 has a plurality of through holes 6B penetrating the skin portion 6 in the thickness direction of the skin portion 6. These plurality of through holes 6B are provided so as to be dispersed over the entire skin portion 6, whereby the skin portion 6 is formed in a mesh shape. A part or all (preferably all) of each through hole 6B of the epidermis portion 6 is completely closed by the bone portion 2B and the joint portion 2J of the skeleton portion 2 connected to the epidermis portion 6. However, ventilation is possible through the through hole 6B.
  • each of the epidermis portions 6 has a plurality of pillar portions 6C extending in columns along the outer surface of the skeleton portion 2 (more specifically, in this example, the epidermis portion 6 has these. It is composed of a pillar portion 6C).
  • the end portions 6Ce of the plurality of pillar portions 6C are connected to each other at a position where the end portions 6Ce of the plurality of pillar portions 6C are adjacent to each other.
  • Each through hole 6B is partitioned between a plurality of pillar portions 6C.
  • Each pillar portion 6C constituting the epidermis portion 6 is not located inside the skeleton portion 2.
  • the porous structure 1 is provided with the skin portion 6, it is possible to prevent the skeleton portion 2 from being exposed to the outside of the porous structure 1, so that a load from a user or the like is applied to the porous structure 1. At that time, the skeleton portion 2 does not receive the load directly, but receives the load through the epidermis portion 6, so that the skeleton portion 2 is less likely to be damaged. Therefore, the durability of the porous structure 1 can be improved. Further, since the outer surface of the epidermis portion 6 has far less unevenness than the outer surface of the skeleton portion 2, the porous structure 1 includes the epidermis portion 6, so that the user can load the porous structure 1. It is possible to reduce the discomfort felt by the user when applying.
  • the sitting comfort of the porous structure 1 can be improved.
  • the skin portion 6 has a plurality of through holes 6B, ventilation to the inside and outside of the skeleton portion 2 via the skin portion 6 can be ensured.
  • the ventilation to the inside and outside of the skeleton portion 2 is the portion of the outer surface of the skeleton portion 2 where the skin portion 6 is not provided.
  • the skin portion 6 does not have to have the through hole 6B, that is, it may be configured in a continuous sheet shape over the entire skin portion 6.
  • each pillar portion 6C is a straight line in a plan view of the skin portion 6 (as shown in FIG. 13, a surface view viewed from a direction perpendicular to the outer surface of the skin portion 6).
  • Each through hole 6B has a triangular shape and is partitioned between three pillar portions 6C extending in different directions. However, a part or all of each pillar portion 6C may extend in a curved shape (along the curved shape).
  • each through hole 6B has an arbitrary polygonal shape other than a triangle (quadrangle, etc.) or an arbitrary shape other than the polygonal shape (for example, a circle (perfect circle, ellipse, etc.)) in the plan view of the skin portion 6. )) May be done.
  • the shapes and dimensions of the through holes 6B in the plan view of the skin portion 6 are uniform (same as each other), but the shapes and / or dimensions of the through holes 6B are not. It may be uniform.
  • each pillar portion 6C constituting the skin portion 6 has a circular (perfect circular shape) in cross-sectional shape.
  • each pillar portion 6C is a cross-sectional shape perpendicular to each extending direction.
  • all or part of the pillar portions 6C constituting the skin portion 6 may have a polygonal cross-sectional shape (equilateral triangle, a triangle other than an equilateral triangle, a quadrangle, etc.), or , A circle other than an equilateral circle (oval, etc.) may be used.
  • each bone portion 2B may have a uniform cross-sectional shape along the extending direction thereof, or may be non-uniform along the extending direction thereof.
  • the cross-sectional shapes of the pillar portions 6C may be different from each other.
  • the width W6C of each pillar portion 6C constituting the skin portion 6 may be uniform along the extending direction of the pillar portion 6C as in the example of the figure, or may be non-uniform along the extending direction of the pillar portion 6C. Further, the width W6C of each pillar portion 6C constituting the skin portion 6 may be the same between the pillar portions 6C as shown in the example of the figure, or may be different between the pillar portions 6C.
  • the width W6C of each pillar portion 6C refers to the maximum width in the cross section when measured along the cross section perpendicular to each extending direction.
  • the maximum value of the width W6C of each pillar portion 6C constituting the skin portion 6 is preferably 3.0 mm or less, and 2.5 mm or less, from the viewpoint of ensuring the cushioning property of the porous structure 1. More suitable.
  • the minimum value of the width W6C of each pillar portion 6C constituting the skin portion 6 is preferably 0.05 mm or more, and more preferably 0.10 mm or more. ..
  • the thickness T6 (FIG. 12) of the skin portion 6 may be uniform or non-uniform over the entire skin portion 6.
  • the maximum value of the thickness T6 of the skin portion 6 is preferably 3.0 mm or less, and more preferably 2.5 mm or less, from the viewpoint of ensuring the cushioning property of the porous structure 1.
  • the minimum value of the thickness T6 of the skin portion 6 is preferably 0.05 mm or more, and more preferably 0.10 mm or more, from the viewpoint of the durability of the skin portion 6.
  • the maximum value of the diameter of each through hole 6B of the epidermis portion 6 (the diameter of the through hole 6B having the largest diameter) is the average value of the diameters of the cell holes C of the skeleton portion 2.
  • the diameter is less than the average value of the cell holes C of the skeleton portion 2.
  • the “diameter” of the through hole 6B is the through hole 6B when the skin portion 6 is viewed in a plan view. It shall refer to the diameter of the circumscribed circle.
  • the area ratio of the through hole 6B in the skin portion 6 is determined from the viewpoint of improving air permeability. , 50% or more is preferable, and 70% or more is more preferable. Further, when each through hole 6B of the epidermis portion 6 is partitioned by a plurality of pillar portions 6C, the area ratio of the through hole 6B in the epidermis portion 6 is 99% or less from the viewpoint of improving the durability of the epidermis portion 6. It is preferable, and 95% or less is more preferable.
  • the "area ratio of the through holes 6B in the epidermis 6" is the ratio of the total area A3 of all the through holes 6B provided in the epidermis 6 to the total area A2 of the epidermis 6 (A3 ⁇ 100 / A2 [A3 ⁇ 100 / A2 [ %]).
  • the "total area A2 of the skin portion 6” refers to the area of the portion surrounded by the outer edge of the skin portion 6, and includes the area occupied by the through hole 6B.
  • the porous structure 1 may or may not include the above-mentioned film 3 (FIG. 8).
  • FIGS. 14 to 15 are drawings for explaining a modified example of the skeleton portion 2 of the porous structure 1 shown in FIGS. 1 to 4.
  • 14 is a plan view showing a part of a modification of the skeleton portion 2 of the porous structure 1 shown in FIGS. 1 to 4, and is a drawing corresponding to FIG. 2.
  • FIG. 15 shows the bone portion 2B of this example alone.
  • FIG. 15A shows a natural state in which no external force is applied to the bone portion 2B
  • FIG. 15B shows a state in which an external force is applied to the bone portion 2B.
  • 14 and 15 show the central axis (skeleton line O) of the bone portion 2B.
  • the bone portion 2B described in this example may be a basic bone portion 2BA or an additional bone portion 2BB. As shown in FIGS.
  • each bone portion 2B of the skeleton portion 2 extends while maintaining a constant cross-sectional area, respectively, in the extending direction of the fixed bone portion 2B1 and the constant bone portion 2B1. It is composed of a pair of bone changing portions 2B2 extending from the bone constant portion 2B1 to the connecting portion 2J while gradually changing the cross-sectional area on both sides of the bone.
  • the basic bone portion 2BA is composed of a basic bone constant portion and a basic bone change portion corresponding to the bone constant portion 2B1 and the bone change portion 2B2, respectively. ..
  • the additional bone portion 2BB is composed of an additional bone constant portion and an additional bone change portion corresponding to the bone constant portion 2B1 and the bone change portion 2B2, respectively.
  • the basic bone constant portion and the additional bone constant portion will be described as “bone constant portion 2B1”
  • the basic bone change portion and the additional bone change portion will be described as “bone change portion 2B2”.
  • each bone change portion 2B2 extends from the bone constant portion 2B1 to the joint portion 2J while gradually increasing the cross-sectional area. Not limited to this example, the same effect can be obtained even if only a part of the bones 2B constituting the skeleton 2 satisfies this configuration.
  • the bone portions 2B constituting the skeleton portion 2 have the bone change portion 2B2 only at one end of the bone constant portion 2B1, and the bone constant portion 2B1 The other end may be directly coupled to the coupling portion 2J, and in that case, the same effect can be obtained, although the degree may vary.
  • the cross-sectional areas of the bone constant portion 2B1 and the bone change portion 2B2 refer to the cross-sectional areas of the cross sections of the bone constant portion 2B1 and the bone change portion 2B2 perpendicular to the skeleton line O, respectively.
  • each bone portion 2B constituting the porous structure 1 is composed of a bone constant portion 2B1 and a bone change portion 2B2, and the cross-sectional area of the bone change portion 2B2 increases from the bone constant portion 2B1 to the joint portion 2J. Is gradually increased, so that the bone portion 2B has a constricted shape in the vicinity of the boundary between the bone constant portion 2B1 and the bone change portion 2B2 so as to become thinner toward the bone constant portion 2B1. Therefore, when an external force is applied, the bone portion 2B is likely to be buckled and deformed at the constricted portion and the intermediate portion of the bone constant portion 2B1, and the porous structure 1 is likely to be compressively deformed.
  • the same behavior and characteristics as general polyurethane foam produced through the step of foaming by a chemical reaction can be obtained.
  • the touch feeling on the surface of the porous structure 1 becomes softer.
  • a soft feel is generally widely preferred, and also a seater in a luxury car with such a porous structure, eg, a vehicle headrest (eg, a person in the backseat with a driver). It is preferred by the seated person who sits in the back seat when carrying.
  • the cross-sectional area A1 of the end 2B21 on either one side (preferably both sides) of the bone portion 2B is 0.15 ⁇ A0 / A1 ⁇ 2.0 It is preferable that the above conditions are satisfied.
  • the touch feeling on the surface of the porous structure 1 can be made moderately hard, not too soft and not too hard, as a characteristic of the porous structure, for example, a headrest for a vehicle.
  • the occupant leans against the porous structure for example, the headrest for a vehicle
  • the occupant is given a feeling of moderate hardness, particularly at the timing when the occupant begins to lean.
  • the smaller the ratio A0 / A1 the softer the touch feeling on the surface of the porous structure 1.
  • the ratio A0 / A1 is less than 0.15, the touch feeling on the surface of the porous structure 1 may become too soft, which may be unfavorable as a characteristic of the porous structure, and manufacturing by a 3D printer may be performed. It is not preferable in terms of manufacturability because it becomes difficult to do so.
  • the ratio A0 / A1 is more than 2.0, the touch feeling on the surface of the porous structure 1 becomes too hard, which may be unfavorable as a characteristic of the porous structure.
  • the ratio A0 / A1 is more preferably 0.5 or more. More specifically, in this example, the bone portion 2B has a bone constant portion 2B1 and a pair of bone change portions 2B2 continuous on both sides thereof, and each bone change portion 2B2 gradually increases its cross-sectional area. While increasing, it extends from the bone constant part 2B1 to the joint part 2J, and the ratio A0 / A1 is less than 1.0. As a result, the touch feeling on the surface of the porous structure 1 can be made relatively soft as a characteristic of the porous structure.
  • each bone portion 2B constituting the skeleton portion 2 may satisfy this configuration, or only a part of the bone portions 2B among the bone portions 2B constituting the skeleton portion 2 satisfies this configuration. In either case, the same effect can be obtained, although the degree may vary.
  • the bone change portion 2B2 may extend from the bone constant portion 2B1 to the joint portion 2J while gradually reducing the cross-sectional area.
  • the bone constant portion 2B1 has a larger (thicker) cross-sectional area than the bone change portion 2B2.
  • the bone constant portion 2B1 is less likely to be deformed, and instead, the portion that is relatively easy to buckle becomes the bone change portion 2B2 (particularly, the portion on the joint portion 2J side), and thus the porous structure.
  • the body 1 is less likely to be compressed and deformed. As a result, the touch feeling on the surface of the porous structure 1 becomes harder, and mechanical properties of high hardness can be obtained.
  • the seated person when the seated person leans against a porous structure, for example, a vehicle headrest, the seated person is given a harder feel, especially at the timing of the beginning of leaning. Such behavior cannot be obtained with a general polyurethane foam produced through a step of foaming by a chemical reaction. Such a configuration can accommodate users who prefer a stiffer feel. Such a hard feel is preferred by occupants, for example, in porous structures of sports vehicles that perform rapid acceleration / deceleration and diagonal line changes, such as vehicle headrests.
  • the bone changing portion 2B2 extends from the bone constant portion 2B1 to the connecting portion 2J while gradually reducing the cross-sectional area, the ratio A0 / A1 becomes more than 1.0.
  • each bone portion 2B constituting the skeleton portion 2 may satisfy this configuration, or only a part of the bone portions 2B among the bone portions 2B constituting the skeleton portion 2 satisfies this configuration. In either case, the same effect can be obtained, although the degree may vary.
  • the bone portion 2B does not have the bone change portion 2B2 and is composed of only the bone constant portion 2B1.
  • the cross-sectional area of the bone portion 2 is constant over its entire length.
  • the touch feeling on the surface of the porous structure 1 when an external force is applied becomes moderate hardness.
  • it can be suitably applied to a porous structure of all vehicle types such as a luxury car and a sports car, for example, a headrest for a vehicle.
  • the ratio A0 / A1 is 1.0.
  • each bone portion 2B constituting the skeleton portion 2 may satisfy this configuration, or only a part of the bone portions 2B among the bone portions 2B constituting the skeleton portion 2 satisfies this configuration. In either case, the same effect can be obtained, although the degree may vary.
  • the bone constant portion 2B1 of each bone portion 2B constituting the skeleton portion 2 has a smaller cross-sectional area than the bone change portion 2B2 and the joint portion 2J.
  • the cross-sectional area of the fixed bone portion 2B1 is the cross-sectional area of each of the bone changing portion 2B2 and the connecting portion 2J (however, excluding the boundary portion between the bone constant portion 2B1 and the bone changing portion 2B2). Smaller than. That is, the fixed bone portion 2B1 is a portion having the smallest (thin) cross-sectional area in the skeleton portion 2.
  • the cross-sectional area of the connecting portion 2J refers to the cross-sectional area of the cross section perpendicular to the skeleton line O of the connecting portion 2J. Not limited to this example, only a part of the bones 2B constituting the skeleton 2 may satisfy this configuration, and even in that case, the degree may vary. A similar effect can be obtained.
  • the bone constant portion 2B1 is smaller in width than the bone change portion 2B2 and the joint portion 2J. More specifically, the width of the bone constant portion 2B1 is larger than the width of each of the bone change portion 2B2 and the joint portion 2J (excluding the boundary portion between the bone constant portion 2B1 and the bone change portion 2B2). ,small. That is, the fixed bone portion 2B1 is the narrowest (thin) portion in the skeleton portion 2. This also makes it easier for the bone constant portion 2B1 to be deformed when an external force is applied, whereby the touch feeling on the surface of the porous structure 1 becomes softer.
  • the widths of the bone constant portion 2B1, the bone change portion 2B2, and the joint portion 2J were measured along the cross section perpendicular to the skeleton line O of the bone constant portion 2B1, the bone change portion 2B2, and the joint portion 2J, respectively. Refers to the maximum width in the cross section.
  • the skeleton line O of the connecting portion 2J is a portion of the skeleton line O corresponding to the connecting portion 2J.
  • FIG. 15A shows the width W0 of the bone constant portion 2B1 and the width W1 of the bone change portion 2B2 for reference. Not limited to this example, only a part of the bones 2B constituting the skeleton 2 may satisfy this configuration, and even in that case, the degree may vary. A similar effect can be obtained.
  • the width W0 of the bone constant portion 2B1 (FIG. 15A) is 0. It is preferably 05 mm or more, and more preferably 0.10 mm or more.
  • the width W0 is 0.05 mm or more, modeling is possible with the resolution of a high-performance 3D printer, and when the width W0 is 0.10 mm or more, modeling is possible not only with the resolution of a high-performance 3D printer but also with the resolution of a general-purpose 3D printer.
  • the width W0 of the bone constant portion 2B1 is preferably 0.05 mm or more and 2.0 mm or less. It is preferable that each bone portion 2B constituting the skeleton portion 2 satisfies this configuration, but only a part of the bone portions 2B constituting the skeleton portion 2 satisfies this configuration. In that case, the same effect can be obtained, although the degree may vary.
  • each bone portion 2B constituting the skeleton portion 2 has one or a plurality (three in this example) inclined surfaces 2B23 on the side surface of each bone changing portion 2B2.
  • the inclined surface 2B23 is inclined (inclined at less than 90 °) with respect to the extending direction of the bone changing portion 2B2, and the width W2 gradually increases from the bone constant portion 2B1 to the connecting portion 2J. Is increasing.
  • the bone portion 2B is easily buckled and deformed at the constricted portion near the boundary between the bone constant portion 2B1 and the bone change portion 2B2, and as a result, the porous structure 1 is compressed. It becomes easy to deform.
  • the extending direction of the bone changing portion 2B2 is the extending direction of the central axis (skeleton line O) of the bone changing portion 2B2.
  • the width W2 of the inclined surface 2B23 of the bone changing portion 2B2 refers to the width of the inclined surface 2B23 when measured along the cross section perpendicular to the skeleton line O of the bone changing portion 2B2.
  • only a part of the bones 2B constituting the skeleton 2 may satisfy this configuration, and even in that case, the degree may vary. A similar effect can be obtained.
  • each bone portion 2B constituting the skeleton portion 2 has a columnar shape, and the bone constant portion 2B1 and the bone change portion 2B2 have equilateral triangular cross-sectional shapes.
  • the durability of the porous structure 1 can be improved as compared with the case where the bone portion 2B is replaced with a thin film-like portion.
  • the cross-sectional shapes of the bone constant portion 2B1 and the bone change portion 2B2 are the shapes in the cross section perpendicular to the central axis (skeleton line O) of the bone constant portion 2B1 and the bone change portion 2B2, respectively.
  • skeleton line O central axis
  • only a part of the bones 2B constituting the skeleton 2 may satisfy this configuration, and even in that case, the degree may vary. A similar effect can be obtained.
  • the bone constant portion 2B1 and the bone change portion 2B2 have polygonal shapes other than the equilateral triangle (equilateral triangle).
  • the bone constant portion 2B1 and the bone change portion 2B2 may have different cross-sectional shapes. Further, each bone portion 2B may have a uniform cross-sectional shape along the extending direction thereof, or may be non-uniform along the extending direction thereof. Further, the cross-sectional shapes of the bone portions 2B may be different from each other.
  • the configuration of the bone portion 2B of the skeleton portion 2 in the above-described modification may be applied to the bone portion 2B of the skeleton portion 2 of any of the first modification example, the second modification example, and the third modification example.
  • the standard basic bone 2BAS corresponds to the above-mentioned bone constant part 2B1 and bone change part 2B2, respectively.
  • the thick basic bone part 2BAF is composed of the thick basic bone fixed part and the thick basic bone change part corresponding to the above-mentioned bone fixed part 2B1 and the bone change part 2B2, respectively. Good.
  • the average cross-sectional area of the thick basic bone constant part is larger than the average cross-sectional area of the standard basic bone constant part
  • the average cross-sectional area of the thick basic bone change part is larger than the average cross-sectional area of the standard basic bone change part.
  • one of the standard basic bone 2BAS and the thick basic bone 2BAF may be composed of the above-mentioned bone constant part 2B1 and bone change part 2B2, or at least a part of the plurality of standard basic bones 2BAS, and At least a part of the plurality of thick basic bone portions 2BAF may be composed of the above-mentioned bone constant portion 2B1 and bone change portion 2B2.
  • the porous structure of the present invention is preferably used as a cushioning material, more preferably used as a cushioning material for seats, and even more preferably used as a headrest for vehicles.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Optics & Photonics (AREA)
  • Physics & Mathematics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Toxicology (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Seats For Vehicles (AREA)
  • Mattresses And Other Support Structures For Chairs And Beds (AREA)
  • Prostheses (AREA)

Abstract

L'invention concerne une structure poreuse qui est composée d'une résine ou d'un caoutchouc souple et qui est pourvue d'une pluralité de parties d'ossature qui séparent une pluralité de trous de cellule, dans laquelle, lors de la prise en compte d'au moins un système de coordonnées cartésiennes XYZ qui a, pour plan XY, un plan virtuel comprenant des lignes d'axe central de deux parties d'ossature adjacentes quelconques parmi la pluralité de parties d'ossature, la rigidité des structures poreuses dans au moins une direction axiale du système de coordonnées cartésiennes XYZ est supérieure à la rigidité de la structure poreuse dans au moins l'une des autres directions axiales.
PCT/JP2020/006070 2019-04-12 2020-02-17 Structure poreuse et appui-tête de véhicule WO2020208938A1 (fr)

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JP2019076048A JP2020172212A (ja) 2019-04-12 2019-04-12 多孔質構造体及び車両用ヘッドレスト

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Cited By (1)

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FR3129859A1 (fr) * 2021-12-08 2023-06-09 Commissariat A L'energie Atomique Et Aux Energies Alternatives Pièce comportant une structure poreuse et son procédé de fabrication

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JP2024002053A (ja) * 2022-06-23 2024-01-11 国立研究開発法人宇宙航空研究開発機構 多孔質構造体、空力音低減用の多孔質構造体、多孔質構造体の製造方法

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US20180071979A1 (en) * 2016-09-13 2018-03-15 Covestro Deutschland Ag Use of an elastic polymer for production of a porous body in an additive manufacturing method
JP2018114704A (ja) * 2017-01-20 2018-07-26 株式会社ミマキエンジニアリング 造形物の製造方法及び造形装置
JP2019205686A (ja) * 2018-05-29 2019-12-05 住友ゴム工業株式会社 三次元構造物

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WO2017208979A1 (fr) * 2016-06-03 2017-12-07 住友ゴム工業株式会社 Structure tridimensionnelle

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US20180071979A1 (en) * 2016-09-13 2018-03-15 Covestro Deutschland Ag Use of an elastic polymer for production of a porous body in an additive manufacturing method
JP2018114704A (ja) * 2017-01-20 2018-07-26 株式会社ミマキエンジニアリング 造形物の製造方法及び造形装置
JP2019205686A (ja) * 2018-05-29 2019-12-05 住友ゴム工業株式会社 三次元構造物

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3129859A1 (fr) * 2021-12-08 2023-06-09 Commissariat A L'energie Atomique Et Aux Energies Alternatives Pièce comportant une structure poreuse et son procédé de fabrication
EP4194126A1 (fr) * 2021-12-08 2023-06-14 Commissariat à l'énergie atomique et aux énergies alternatives Piece comportant une structure poreuse et son procede de fabrication

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