Panel structure

Abstract

To improve rigidity against bending loads in multiple directions in a panel structure.SOLUTION: A face plate 12 has opposite sides 16 extending in a lateral direction. The face plate 12 is formed with an outer protrusion part 13 and an inner recessed part 14. The outer protrusion part 13 protrudes in a thickness direction and has opposite sides 21 which extend in the lateral direction along the opposite sides 16 of the face plate 12 at both ends in a vertical direction. The inner recessed part 14 is recessed in the thickness direction at the inner side of the outer protrusion part 13.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a panel structure. [Background technology]

[0002] The panel structure described in Patent Document 1 aims to improve rigidity by forming a pattern of many convex shapes on a metal plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-261360 Summary of the Invention [Problem to be solved by the invention]

[0004] Even if a large number of convex shapes are formed as a pattern, if the gaps between the convex shapes extend linearly, the rigidity against bending loads around the axis along the extending direction of the gaps is low. An object of the present invention is to increase the rigidity of a panel structure against bending loads in multiple directions. [Means for solving the problem]

[0005] A panel structure according to one aspect of the present invention includes a face material. Two different face directions are defined as a vertical direction and a horizontal direction. The face material has opposite sides extending in the horizontal direction. An outer convex portion and an inner concave portion are formed on the face material. The outer convex portion is convex in the thickness direction and has opposite sides extending in the horizontal direction along the opposite sides of the face material at both ends in the vertical direction. The inner concave portion is concave in the thickness direction inside the outer convex portion. [Effects of the Invention]

[0006] According to the present invention, the outer convex portion and the inner concave portion can prevent the gap from extending linearly, thereby increasing rigidity against bending loads in multiple directions. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing a panel structure. [Figure 2] FIG. [Figure 3] FIG. 1 is a diagram illustrating a three-point bending test. [Figure 4] 10A and 10B are diagrams illustrating a three-point bending test on a panel structure. [Figure 5] FIG. 10 is a diagram illustrating the stiffness magnification. [Figure 6] FIG. [Figure 7] FIG. 1 is a diagram showing a comparative example 1. [Figure 8] FIG. 10 is a diagram showing Comparative Example 2. [Figure 9] FIG. 10 is a diagram showing Comparative Example 3. [Figure 10] FIG. 10 is a diagram showing the comparison results. [Figure 11] FIG. 10 is a diagram showing a comparative example in which the plate thickness is increased. [Figure 12] FIG. 10 is a diagram showing a comparative example in which a bent portion is provided. [Figure 13] FIG. 10 is a diagram showing a comparative example in which a number of convex shapes are patterned. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the drawings are schematic and may differ from the actual product. Furthermore, the following embodiments exemplify devices and methods for embodying the technical concept of the present invention, and are not intended to limit the configuration to those described below. In other words, the technical concept of the present invention can be modified in various ways within the technical scope described in the claims.

[0009] <<Embodiment>> "composition" In the following description, the three mutually orthogonal directions are referred to as a vertical direction, a horizontal direction, and a thickness direction. FIG. 1 is a diagram showing a panel structure 11. (a) in the figure shows the panel structure 11 as viewed from the other side in the vertical direction, one side in the horizontal direction, and one side in the thickness direction. (b) in the figure shows the panel structure 11 as viewed from one side in the thickness direction. (c) in the figure shows the panel structure 11 as viewed from the other side in the vertical direction. The panel structure 11 is applied to sheet metal structures such as electrical panels, vending machines, and showcases, and is mainly used in areas where strength is required and where aesthetic appearance due to unevenness is not an issue, such as bottom plates and internal partition plates. The panel structure 11 is not limited to being made of metal, but may also be made of resin. The panel structure 11 has one face material 12. The face material 12 is formed with an outer convex portion 13 and an inner concave portion 14. The face material has opposite sides 16 extending in the horizontal direction.

[0010] The outer protrusion 13 is convex in the thickness direction and has opposite sides 21 that extend laterally along opposite sides 16 of the face material 12 at both vertical ends. The outer protrusion 13 has opposite sides 22 that extend vertically. The contour of the outer protrusion 13 when viewed from the thickness direction is quadrangular, specifically a square. The outer protrusion 13 has a top surface 23 that is parallel to the surface direction. The inner recess 14 is recessed in the thickness direction inside the outer protrusion 13, and its outline viewed from the thickness direction is different from the outline of the outer protrusion 13. The inner recess 14 has two pairs of opposite sides 24 and 25 that are non-parallel to both the vertical and horizontal directions. The outline of the inner recess 14 viewed from the thickness direction is quadrangular, specifically a square. That is, the opposite sides 24 and 25 extend at a 45-degree angle to both the vertical and horizontal directions. The inner recess 14 has a bottom surface 26 that is parallel to the surface direction.

[0011] FIG. 2 is a diagram showing the outer convex portion 13. As shown in FIG. (a) in the figure shows the outer convex portion 13 as viewed from the vertical direction when no bending load is acting on the face material 12. The outer convex portion 13 has a top surface 23 parallel to the face direction, and has a cross-sectional shape that is approximately trapezoidal. (b) in the figure schematically shows the outer convex portion 13 as viewed from the vertical direction when a bending load is acting on the face material 12. The presence of the top surface 23 on the outer convex portion 13 makes the face material appear as if its thickness has been increased by the height of the outer convex portion 13, as shown by the hatched area. Therefore, the bending rigidity is improved compared to a face material that does not have a top surface 23 and has a cross-sectional shape that is approximately triangular or approximately semicircular. Here, the outer convex portion 13 has been described, but the bottom surface 26 of the inner recess 14 is similar, so it is not shown in the figure.

[0012] Next, the three-point bending test will be described. FIG. 3 is a diagram illustrating the three-point bending test. Two mutually orthogonal directions in the plane direction are defined as the first direction and the second direction. (a) in the figure shows the state of a three-point bending test on the test piece 35 as viewed from the thickness direction. (b) in the figure shows the state of a three-point bending test on the test piece 35 as viewed from the first direction. In the three-point bending test, the test piece 35 is supported from one side by two support points 36 extending in the first direction on both sides of the second direction, and a bending load is applied to the test piece 35 from the other side by an indenter 37 extending in the first direction at the center of the second direction. This bends the test piece 35 along the bending deformation line Lb extending in the first direction. The distance between the support points 36 along the second direction is defined as Df. FIG. 4 is a diagram illustrating a three-point bending test performed on the panel structure 11. In the figure, (a) shows the panel structure 11 as viewed from one side in the thickness direction. When a three-point bending test is performed, the panel structure 11 is bent along the bending deformation line Lb. It is desirable that the dimension of the opposite side 21 of the outer convex portion 13 be set to 0.7 times or more the distance Df between the support points 36 along the second direction.

[0013] Example Next, an example will be described. FIG. 5 is a diagram illustrating the stiffness magnification. (a) in the figure is a graph showing displacement versus load when a nonlinear static analysis was performed on a flat plate simulating a three-point bending test. Here, the vertical axis represents load and the horizontal axis represents displacement. The region where load and displacement are proportional is the elastic region, and the slope at this point is defined as a stiffness multiplier of 1.0. (b) in the figure is a graph showing the stiffness multiplier when a three-point bending test was performed with different pattern angles. The pattern angles were 0 degrees, 45 degrees, 90 degrees, 135 degrees, and 180 degrees, but since a flat plate without a pattern was actually used, the same test specimen was used in all cases, and the stiffness multiplier was 1.0.

[0014] FIG. 6 is a diagram showing an embodiment. In the example, a nonlinear static analysis simulating a three-point bending test was performed on a panel structure 11 having the aforementioned rectangular outer convex portion 13 and inner recess 14. The panel structure 11 has a vertical dimension of 50 mm, a horizontal dimension of 150 mm, a thickness of the face material 12 of 1 mm, and a height of the outer convex portion 13 of 3 mm. The height of the outer convex portion 13 is the dimension from the upper surface of the face material 12 to the upper surface of the top surface 23. Therefore, the height of the outer convex portion 13 is added to the thickness of the face material 12, resulting in a total thickness of 4 mm for the panel structure 11. The dimensions of the outer convex portion 13 in the extension direction at opposite side 21 and opposite side 22 are both 46 mm. The vertical distance between opposite side 16 and opposite side 21 is 2 mm. The dimensions of the inner recess 14 in the extension direction at opposite side 24 and opposite side 22 are both 24 mm.

[0015] (a) in the figure shows a panel structure 11 with a pattern angle of 0 degrees. The pattern angle is not the rotation angle of the panel structure 11, but the angle of the pattern formed on the panel structure 11. Although not shown here, panel structures 11 with pattern angles of 45 degrees, 90 degrees, 135 degrees, and 180 degrees were also prepared, and the rigidity multiplier was calculated when a three-point bending test was conducted. (b) in the figure is a graph showing the rigidity multiplier for each pattern angle. When the pattern angles are 0 degrees, 90 degrees, and 180 degrees, the rigidity multiplier is approximately 5.7, and when the pattern angles are 45 degrees and 135 degrees, the rigidity multiplier is approximately 3.1.

[0016] FIG. 7 is a diagram showing a first comparative example. In Comparative Example 1, a nonlinear static analysis simulating a three-point bending test was performed on a panel structure 41 in which beam-like protrusions were patterned in a staggered arrangement. (a) in the figure shows a panel structure 41 with a pattern angle of 0 degrees. The pattern angle is the angle of the pattern formed on the panel structure 41, and refers to the angle of the direction in which the beam-like protrusions extend relative to the vertical direction. Although not shown here, the rigidity multiplier was calculated when a nonlinear static analysis simulating a three-point bending test was performed on panel structures 41 with pattern angles of 45 degrees, 90 degrees, 135 degrees, and 180 degrees. (b) in the figure is a graph showing the rigidity multiplier for each pattern angle. When the pattern angles were 0 degrees and 180 degrees, the rigidity multiplier was approximately 7.2, when the pattern angles were 45 degrees and 135 degrees, the rigidity multiplier was approximately 2.3, and when the pattern angle was 90 degrees, the rigidity multiplier was approximately 0.8. Therefore, although the maximum rigidity multiplier is high, the minimum rigidity multiplier is equivalent to that of a flat plate.

[0017] FIG. 8 is a diagram showing a second comparative example. In Comparative Example 2, a nonlinear static analysis simulating a three-point bending test was performed on a panel structure 42 in which circular embossed protrusions were patterned in a staggered arrangement. (a) in the figure shows the panel structure 42 with a pattern angle of 0 degrees. The pattern angle refers to the angle of the pattern formed on the panel structure 42. Although not shown here, the rigidity multiplier was calculated when a nonlinear static analysis simulating a three-point bending test was performed on panel structures 42 with pattern angles of 45 degrees, 90 degrees, 135 degrees, and 180 degrees. (b) in the figure is a graph showing the rigidity multiplier for each pattern angle. When the pattern angles were 0 degrees and 180 degrees, the rigidity multiplier was approximately 1.3, when the pattern angles were 45 degrees and 135 degrees, the rigidity multiplier was approximately 1.5, and when the pattern angle was 90 degrees, the rigidity multiplier was approximately 1.2. Therefore, although the difference in rigidity multiplier due to the pattern angle was small, the overall rigidity multiplier was low.

[0018] FIG. 9 is a diagram showing a comparative example 3. In Comparative Example 3, a nonlinear static analysis simulating a three-point bending test was performed on a panel structure 43 having a pattern of equilateral cross-shaped convex portions. The equilateral cross convex portions have a shape in which the intersection of the vertical and horizontal convex portions coincides with both the longitudinal center of the vertical convex portion and the longitudinal center of the horizontal convex portion. (a) in the figure shows a panel structure 43 with a pattern angle of 0 degrees. The pattern angle is the angle of the pattern formed on the panel structure 43. Although not shown here, the panel structure 43 also has pattern angles of 45 degrees, 90 degrees, 135 degrees, and 180 degrees. The rigidity multiplier was calculated when a nonlinear static analysis simulating a three-point bending test was performed on the panel structure 43. (b) in the figure is a graph showing the rigidity multiplier for each pattern angle. The rigidity multiplier was approximately 3.6 when the pattern angles were 0 degrees and 180 degrees, approximately 2.8 when the pattern angles were 45 degrees and 135 degrees, and approximately 3.6 when the pattern angle was 90 degrees. Therefore, the stiffness ratio is high at any pattern angle, but is inferior to the square embodiment.

[0019] FIG. 10 is a diagram showing the comparison results. In the example where the squares are combined, the maximum rigidity multiplier is approximately 5.7 and the minimum rigidity multiplier is approximately 3.1. In the beam-shaped comparative example 1, the maximum rigidity multiplier is approximately 4.8 and the minimum rigidity multiplier is approximately 3.0. In the embossed comparative example 2, the maximum rigidity multiplier is approximately 1.5 and the minimum rigidity multiplier is approximately 1.2. In the regular cross comparative example 3, the maximum rigidity multiplier is approximately 3.6 and the minimum rigidity multiplier is approximately 2.8. Therefore, the example where the squares are combined has the second highest maximum rigidity multiplier after comparative example 1 and the highest minimum rigidity multiplier. As such, it was found that the example where the squares are combined has high rigidity against bending loads in multiple directions.

[0020] <<Action and Effect>> Next, the main effects of the embodiment will be described. The panel structure 11 includes a face material 12. Two different surface directions are defined as a vertical direction and a horizontal direction, and the face material 12 has an opposite side 16 extending in the horizontal direction. The face material 12 is formed with an outer convex portion 13 and an inner concave portion 14. The outer convex portion 13 is convex in the thickness direction and has opposite sides 21 extending horizontally along the opposite side 16 of the face material 12 at both vertical end portions. The inner concave portion 14 is concave in the thickness direction inside the outer convex portion 13. The outer convex portion 13 and the inner concave portion 14 prevent gaps from extending linearly, thereby increasing rigidity against bending loads in multiple directions. In particular, the formation of the opposite side 21 of the outer convex portion 13 increases rigidity against bending loads around an axis along the vertical direction.

[0021] The outer protrusion 13 has opposite sides 22 extending in the vertical direction. This prevents the gap from extending linearly, thereby increasing rigidity against bending loads in multiple directions. In particular, the formation of opposite sides 22 of the outer protrusion 13 increases rigidity against bending loads around an axis along the horizontal direction. The contour of the outer convex portion 13 is rectangular when viewed from the thickness direction, which prevents the gap from extending linearly, thereby increasing rigidity against bending loads in multiple directions. The contour of the outer convex portion 13 as viewed in the thickness direction is separated from the contour of the outer convex portion 13. This makes it possible to increase the rigidity against bending loads around the axis along the vertical direction because the opposite side 21 is continuous.

[0022] The inner recess 14 has two pairs of opposite sides 24 and 25 that are non-parallel to both the vertical and horizontal directions. This prevents the gap from extending linearly, thereby increasing rigidity against bending loads in multiple directions. In particular, the formation of the opposite sides 24 and 25 of the inner recess 14 increases rigidity against bending loads around an axis that is non-parallel to both the vertical and horizontal directions. The inner recess 14 has a rectangular outline when viewed in the thickness direction, which prevents the gap from extending linearly, thereby increasing rigidity against bending loads in multiple directions.

[0023] The vertical direction and the horizontal direction are perpendicular to each other, which makes it possible to increase rigidity against bending loads around an axis along the horizontal direction and bending loads around an axis along the vertical direction. The inner recess 14 has two pairs of opposite sides 24 and 25 that extend at 45 degrees to both the vertical and horizontal directions. This prevents the gap from extending linearly, thereby increasing rigidity against bending loads in multiple directions. In particular, the formation of the opposite sides 24 and 25 of the inner recess 14 increases rigidity against bending loads around an axis that forms a 45-degree angle with both the vertical and horizontal directions. The outer convex portion 13 has a top surface 23 formed parallel to the surface direction. As a result, when the face material 12 is used as a reference, it acts like a face material whose thickness is increased by the height of the outer convex portion 13, thereby improving bending rigidity.

[0024] The inner recess 14 has a bottom surface 26 formed parallel to the surface direction. This makes the surface material appear as if it has a thickness increased by the height of the inner recess 14 when the top surface 23 is used as the reference, thereby improving bending rigidity. Two mutually orthogonal directions among the surface directions are defined as a first direction and a second direction. In the panel structure 11, the face material 12 is supported from one side by two support points 36 extending in the first direction on both sides of the second direction. In this case, the dimension of the opposite side 21 extending laterally in the outer convex portion 13 is set to 0.7 times or more the distance between the support points 36 along the second direction. This increases rigidity against bending loads.

[0025] Other Comparative Examples To increase the rigidity of the face material, the thickness of the plate may be increased. FIG. 11 is a diagram showing a comparative example in which the plate thickness is increased. Here, an example is shown in which the plate thickness is increased from t1 to t2. Increasing the plate thickness is an easy method, but it is not realistic to increase the plate thickness by 4 times, 5 times, ... n times, as the cost increases with the increase in plate thickness, and the effect of increasing rigidity is not as great as expected. Furthermore, increasing the plate thickness reduces workability and makes handling difficult due to the increase in weight.

[0026] In order to increase the rigidity of the face material, a folded portion may be provided. FIG. 12 is a diagram showing a comparative example in which a bent portion is provided. (a) in the figure shows an example where a bent section is provided on one side of the face material. By providing a bent section on the face material, it is easy to increase the height and it also has a great effect in increasing rigidity, but it is difficult to increase the rigidity against bending loads in multiple directions. In this case, it is strong against bending loads in direction A, but weak against bending loads in direction B. (b) in the figure shows an example where a bent section is provided on all four sides of the face material. This makes it possible to increase the rigidity against bending loads in multiple directions, but since it is not possible to provide a bent section in the center of the face material, the rigidity is low.

[0027] To increase the rigidity of the face material, a number of convex shapes may be patterned. FIG. 13 is a diagram showing a comparative example in which a number of convex shapes are patterned. (a) in the figure shows a panel structure 41 in which beam-like protrusions are patterned in a staggered arrangement. This configuration is strong against bending loads around an axis along the vertical direction, but weak against bending loads around an axis along the horizontal direction. In other words, as shown by the thick solid lines, it is prone to bending along bending deformation lines. (b) in the figure shows a panel structure 42 in which circular embossed protrusions are patterned in a staggered arrangement. This configuration also tends to bend along bending deformation lines that run approximately vertically while avoiding the protrusions, or along diagonal bending deformation lines, as shown by the thick solid lines. Thus, even if a pattern of many protrusions is formed, if the gaps between the protrusions extend linearly, the rigidity against bending loads around an axis along the extension direction of the gaps is low.

[0028] <<Variation>> In the embodiment, the outer protrusion 13 is described as being square, but the present invention is not limited to this and the outer protrusion 13 may be rectangular or a rounded quadrangle with rounded corners. Furthermore, the outer protrusion 13 may be hexagonal as long as it has opposite sides 21. Furthermore, the outer protrusion 13 may be octagonal as long as it has opposite sides 21 and 22. In the embodiment, the configuration in which the inner recess 14 is square has been described, but the present invention is not limited to this and the inner recess 14 may be rhombic or a rounded rhombic with rounded corners. Furthermore, the inner recess 14 may be hexagonal as long as it has opposite sides 24. Furthermore, the outer protrusion 13 may be octagonal as long as it has opposite sides 24 and 25.

[0029] Although the present invention has been described above with reference to a limited number of embodiments, the scope of the invention is not limited thereto, and modifications of the embodiments based on the above disclosure will be obvious to those skilled in the art. [Explanation of symbols]

[0030] 11...Panel structure, 12...Face material, 13...External convex portion, 14...Inner concave portion, 16...Opposite side, 21...Opposite side, 22...Opposite side, 23...Top surface, 24...Opposite side, 25...Opposite side, 26...Bottom surface, 35...Test piece, 36...Support point, 37...Indenter, 41...Panel structure, 42...Panel structure, 43...Panel structure

Claims

1. Two different directions among the surface directions are defined as a vertical direction and a horizontal direction, a face member having opposite sides extending in the lateral direction; The face material includes: an outer convex portion that is convex in the thickness direction and has opposite sides that extend in the horizontal direction along the opposite sides of the face material at both ends in the vertical direction; A panel structure characterized in that an inner recess is formed inside the outer protrusion, which is recessed in the thickness direction.

2. The panel structure according to claim 1 , wherein the outer convex portion has opposite sides extending in the longitudinal direction.

3. The panel structure according to claim 2, wherein the outer protrusion has a rectangular outline when viewed in the thickness direction.

4. 2. The panel structure according to claim 1, wherein the contour of the inner recess, as viewed in the thickness direction, is separated from the contour of the outer protrusion.

5. 2. The panel structure according to claim 1, wherein the inner recess has two pairs of opposite sides that are non-parallel to both the vertical direction and the horizontal direction.

6. The panel structure according to claim 5, wherein the inner recess has a rectangular outline when viewed in the thickness direction.

7. The panel structure according to claim 1 , wherein the longitudinal direction and the lateral direction are orthogonal to each other.

8. 8. The panel structure of claim 7, wherein the inner recess has two pairs of opposite sides extending at 45 degrees to both the longitudinal direction and the lateral direction.

9. The panel structure according to claim 1 , wherein the outer convex portion has a top surface formed parallel to the surface direction.

10. The panel structure according to claim 1 , wherein the inner recess has a bottom surface parallel to the surface direction.

11. Two directions perpendicular to each other among the planar directions are defined as a first direction and a second direction, The panel structure described in claim 1, characterized in that when the panel is supported from one side by two support points extending in the first direction on both sides of the second direction, the dimension of the opposite side extending in the horizontal direction in the outer convex portion is set to be 0.7 times or more the distance between the support points along the second direction.

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