JP2012051004A - Plate material having concavo-convex part, and vehicle panel and laminated structure using the plate material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate material having a pattern of a concavo-convex part producing an effect of highly improved rigidity, and to provide a vehicle panel and a laminated structure using the plate material.SOLUTION: A reference face is formed by closely laying first unit areas 231 and second unit areas 232. The first unit areas 231 and the second unit areas 232 are divided into three, and partitioned to first divided areas 214 and second divided areas 224 respectively. An area consisting of the first divided areas 214 is made to be a first reference area 213, and an area consisting of the second divided areas 224 is made to be a second reference area 223. There are provided a first area, which projects from the first reference area 213 toward the front side of figure with respect to the reference face, and a second area, which projects from the second reference area 223 toward the behind side of figure with respect to the reference face. The first area consists of a first top face and first side faces, and the second area consists of a second top face and second side faces.

Description

  The present invention relates to a plate member having increased rigidity by forming an uneven portion, and a vehicle panel and a laminated structure configured using the plate member.

For example, in an automobile, for the purpose of weight reduction, replacement of a material of a component made of a steel plate or the like with a light material such as an aluminum alloy plate has been studied and implemented. In this case, it is necessary to ensure the required rigidity as a premise for weight reduction.
Heretofore, in order to improve the rigidity without increasing the plate thickness of the plate material, it has been studied to improve the rigidity in terms of shape by providing an uneven pattern on the plate material.
For example, one of automobile parts is a part made of a plate material called a heat insulator. Patent Document 1 proposes a material in which a large number of protrusions are formed by embossing in order to ensure sufficient rigidity without increasing the plate thickness. Moreover, not only a heat insulator but the board | plate material which improved rigidity by forming uneven | corrugated | grooved parts, such as embossing, in various uses is proposed. (Patent Documents 2 to 6)

JP 2000-136720 A JP 2000-257441 A Japanese Patent Laid-Open No. 9-254955 Japanese Patent Laid-Open No. 2000-288643 JP 2002-307117 A JP 2002-321018 A

As described in Patent Document 1, it is a fact that a plate material on which a large number of uneven portions are formed has higher rigidity than that without the uneven portions. However, it cannot be said that what is the most suitable uneven shape for improving the rigidity without increasing the plate thickness has been elucidated. And it is always requested | required to make a rigidity improvement rate higher than before.
In addition to automobiles, various mechanical devices and the like have a demand for reducing the weight of a portion made of a plate material as much as possible. In addition to the need for weight reduction, the effect of reducing material costs is also expected. Moreover, if it is a board | plate material (material which has a board shape), a rigidity improvement request | requirement exists regardless of a material.

  In addition, the use of plate materials with uneven portions with high rigidity improvement effects, and vehicle panels that combine laminated structures including them and plate materials with uneven portions with high rigidity improvement effects are also more rigid than before. It is also demanded to.

  The present invention has been made in view of such problems, and is a plate material having improved rigidity by providing uneven portions, and a plate material having a pattern of uneven portions having a higher rigidity improvement effect than before, and It is an object of the present invention to provide a used vehicle panel and a laminated structure.

1st invention is the board | plate material which improved rigidity by forming an uneven | corrugated | grooved part,
The concavo-convex portion is based on three reference planes, a first reference plane, an intermediate reference plane, and a second reference plane, which are virtual three planes sequentially arranged in parallel at intervals.
Assuming that the intermediate reference plane is laid out with a first unit area and a second unit area which are virtual squares, one of two directions along two orthogonal sides of the virtual square is horizontal and the other is If the vertical direction,
The first unit area is divided into three in the horizontal direction at an arbitrary ratio A: B: A, two areas divided into the ratio A are defined as the first divided areas, and one area divided into the ratio B is defined as the first area. A two-part area,
The second unit area is divided into three in the vertical direction at an arbitrary ratio A: B: A, the two areas divided into the ratio A are defined as the second divided areas, and the one area divided into the ratio B is defined as the second area. One divided area,
In the intermediate reference plane, the first unit area and the second unit area are alternately arranged in the vertical direction and the horizontal direction, and a substantially I-shaped area formed by the adjacent first divided areas Is a first reference region, and a region that is substantially I-shaped formed by the adjacent second divided region is a second reference region,
A first region projecting from the first reference region defined on the intermediate reference surface toward the first reference surface; and a second reference surface defined from the second reference region defined on the intermediate reference surface. A second region projecting toward the
The first region includes a first top surface obtained by projecting the first reference region on the first reference surface with the same magnification or reduction, an outline of the first top surface, and an outline of the first reference region. The first side to be connected,
The second region includes a second top surface obtained by projecting the second reference region on the second reference surface with the same magnification or reduction, an outline of the second top surface, and an outline of the second reference region. The present invention lies in a plate material having a concavo-convex portion characterized by comprising a second side surface to be connected (Claim 1).

  A second invention is a laminated structure formed by laminating a plurality of plate materials, wherein at least one of the plate materials is a plate material having the uneven portion of the first invention. (Claim 8).

  3rd invention is a vehicle panel which has an outer panel and the inner panel joined to the back surface of this outer panel, Comprising: Either one or both of the said outer panel and said inner panel are the unevenness | corrugations of said 1st invention. The vehicle panel is characterized by comprising a plate member having a portion (claim 9).

  The board | plate material which has the said uneven | corrugated | grooved part in 1st invention has the uneven | corrugated | grooved part of the said special shape. As described above, the concavo-convex portion includes the first region protruding toward the first reference surface from the first reference region defined on the intermediate reference surface, and the predetermined region defined on the intermediate reference surface. The second region protruding from the second reference region toward the second reference surface is provided. The first region includes the first top surface, the first side surface connecting the contour of the first top surface and the contour of the first reference region, and the second region includes the second top surface. And the second side surface connecting the contour of the second top surface and the contour of the second reference region.

Since it has such a structure, the plate material of the present invention is excellent in bending rigidity and surface rigidity, and is a plate material excellent in energy absorption characteristics. In addition, it is possible to obtain a vibration damping improvement effect and a sound echo suppression effect due to the uneven shape accompanying an increase in rigidity.
The reason why the rigidity is improved is considered as follows. That is, the first region and the second region are arranged such that the first top surface and the second top surface arranged at positions separated in the thickness direction of the plate material, and the first side surface intersecting the thickness direction of the plate material. And many materials can be arrange | positioned in the position which consists of said 2nd side surface and was distant from the neutral surface. Therefore, many materials can be effectively used as the strength member, and the rigidity improvement effect can be enhanced.

  As described above, according to the present invention, it is possible to obtain a plate material having a pattern of uneven portions having a higher rigidity improvement effect and superior energy absorption characteristics than the conventional one.

  In the second invention, by using the plate member having the uneven portion having excellent rigidity as part of the laminated structure as described above, a laminated structure having extremely high rigidity and excellent energy absorption characteristics can be easily obtained. be able to. In addition, it is possible to obtain the effect of improving the vibration damping property accompanying the improvement of rigidity and the effect of improving the sound absorption by enclosing the air layer.

  In the third aspect of the present invention, a vehicle having extremely high rigidity and excellent energy absorption characteristics is obtained by using the plate member having the uneven portion with high rigidity as described above for one or both of the outer panel and the inner panel. Panels can be easily obtained. In addition, it is possible to obtain the effect of improving the vibration damping property accompanying the improvement of rigidity and the effect of improving the sound absorption by enclosing the air layer.

FIG. 3 is a partial plan view of a concavo-convex part in Example 1. The elements on larger scale of the AA arrow cross section of FIG. FIG. 3 is a partial perspective view of an uneven portion in Example 1. FIG. 3 is an explanatory diagram illustrating an arrangement of a first reference area and a second reference area on an intermediate reference surface in the first embodiment. Explanatory drawing which shows the result of the FEM analysis by a cantilever when the angle which the one side of the test piece and the one side of a unit area | region in Example 1 make is changed. FIG. 3 is an explanatory view showing a three-point bending test method in Example 1. The load-displacement diagram of the three-point bending test in Example 1. FIG. FIG. 6 is an explanatory diagram showing an arrangement of a first reference area and a second reference area on an intermediate reference surface in Embodiment 2. Explanatory drawing which shows the intermediate | middle reference plane which formed the fillet in the corner | angular part of the outline of the 1st reference area | region and 2nd reference area | region in Example 3. FIG. Explanatory drawing which shows the cylindrical board | plate material which has an uneven | corrugated | grooved part in Example 4. FIG. Explanatory drawing of the laminated structure in Example 5. FIG. Explanatory drawing of the vehicle panel in Example 6. FIG.

  In the present invention, the representation of the shape such as a square is not limited to the geometrically narrow concept, and generally includes a shape that can be recognized as the above shape, and each side is slightly curved, Naturally, it is also allowed to provide a so-called fillet curved surface in which a round shape or the like necessary for a molded shape is formed at a corner or surface. In addition, the expression of parallel is not limited to a geometrically narrow concept and can be generally recognized as a parallel plane.

  The first reference region and the second reference region are both substantially I-shaped, but can take various forms as shown in the examples described later. For example, as in Example 1 to be described later, an I-shaped vertical bar part and a horizontal bar part can have a contour shape having the same width, and, as in Example 2, the width of the I-type vertical bar part. Can be formed into a contour shape that is thicker than the width of the horizontal bar portion. Further, as in the third embodiment, a fillet can be provided at a corner portion of a substantially I-shaped contour.

  The state in which the virtual square forming the unit area is divided into three in the horizontal direction is parallel to one side in the vertical direction drawn from two points dividing the one side in the horizontal direction forming the square into three. The square is divided by two straight lines, and three regions are formed side by side in the horizontal direction. Further, the state in which the virtual square forming the unit area is divided into three in the vertical direction is parallel to one side in the horizontal direction drawn from two points that divide one side in the vertical direction forming the square into three. The square is divided by two straight lines, and three regions are formed side by side in the vertical direction.

  In addition, the first top surface and the second top surface may be configured by surfaces on the first reference surface and the second reference surface, respectively, or alternatively, the first reference surface and the second reference surface. It can comprise by the site | part which protruded in the direction opposite to the said intermediate | middle reference plane from the surface. Examples of the shape of the protruding portion include a dome shape, a ridge line shape, and a cone shape, but are not limited thereto.

Further, in the plate having the concavo-convex portion, the first reference region and the second reference region are arranged so that the areas of the two do not change after connecting the first divided region and the second divided region. A part of the corner portion can be formed in a circular arc shape (claim 2).
Here, the corner refers to a corner that becomes a convex angle in the outline of the first reference area and a corner that becomes a convex angle in the outline of the second reference area. In this case, since the corner | angular part of the unevenness | corrugation of the board | plate material which has the said uneven | corrugated | grooved part can be smoothed, while being easy to shape | mold, an expansion of a use and improvement of design property can be aimed at.

In the plate having the uneven portion, the inclination angle θ ₁ (°) of the first side surface with respect to the intermediate reference surface and the inclination angle θ ₂ (°) of the second side surface with respect to the intermediate reference surface are 10 It is preferable that it is in the range of ° to 90 ° (Claim 3).
When the inclination angle θ ₁ (°) of the first side surface and the inclination angle θ ₂ (°) of the second side surface with respect to the intermediate reference surface are in the range of 10 ° to 90 °, the moldability is secured. Thus, an uneven portion shape having an excellent rigidity improvement rate can be obtained.

When the inclination angle θ ₁ (°) of the first side surface and the inclination angle θ ₂ (°) of the second side surface are less than 10 °, the protrusion heights of the first region and the second region are increased. And the rigidity improvement rate decreases. In addition, it is difficult to form the concavo-convex portion when the inclination angle θ ₁ (°) of the first side surface and the inclination angle θ ₂ (°) of the second side surface exceed 90 °, which is an unnecessary region.
In the case of press forming a metal plate, the upper limit of the inclination angle θ ₁ (°) of the first side surface and the inclination angle θ ₂ (°) of the second side surface is 70 ° or less due to formability problems. More preferably. Therefore, a more preferable range is 10 ° to 70 °.
Moreover, although the said 1st side surface and the said 2nd side surface are comprised by several surfaces, all of those surfaces do not need to be the same inclination angles, and you may change an inclination angle according to a site | part. However, in any face, it is preferable to be within the range of the preferable inclination angle.

Further, in the plate member having the concavo-convex portion, it is preferable that at least a part of the first reference surface, the intermediate reference surface, and the second reference surface that are sequentially arranged are each a parallel curved surface.
In this case, it is possible to deform the plate material having the above-described uneven portion having high rigidity into various shapes, and the application can be expanded.

Moreover, in the plate material having the concavo-convex portion, it is preferable that the concavo-convex portion is formed by press-molding a metal plate.
The metal plate can be easily formed with uneven portions by performing plastic working such as press forming such as embossing or roll forming. Therefore, in the case of a metal plate, it is relatively easy to apply the above excellent uneven shape. As a material of the metal plate, various materials that can be plastically processed such as aluminum alloy, steel, and copper alloy can be applied.

In the forming method, casting, cutting, etc. can be employed in addition to plastic working such as roll forming.
Moreover, as long as the said board | plate material has the said uneven | corrugated | grooved part, it is effective also in materials other than a metal, For example, it can also be set as a resin board etc. If it is a resin material or the like, the uneven portion can be formed by injection molding or hot pressing. Resin materials are less susceptible to molding restrictions than metal materials, and the degree of freedom in design is greater.

Moreover, in the plate material having the concavo-convex portion, it is preferable that a plate thickness t (mm) before forming the metal plate is 0.05 mm to 6.0 mm.
When the thickness of the metal plate is less than 0.05 mm or more than 6.0 mm, there is little need to improve the rigidity in terms of use.

In the plate material having the uneven portion, the ratio L / t between the length L (mm) of one side of the unit region and the plate thickness t (mm) of the metal plate is preferably 10 to 2000 ( Claim 7).
If the ratio L / t is less than 10, molding may be difficult. On the other hand, if the ratio L / t exceeds 2000, a sufficient uneven portion shape cannot be formed and rigidity is reduced. There is a risk of problems.

Further, when the length of the short side of the rectangular shape formed by the region divided into the ratio B is B _L (mm) with respect to the length L (mm) of one side of the square, the plate material is 0.2L ≦ B _L ≦ 0.6 _L is preferable (claim 8).
When it is out of the range of 0.2L ≦ B _L ≦ 0.6L, it may be difficult to form the uneven portion shape.

Further, in the plate material having the concavo-convex portion, a ratio H1 / t between the protruding height H1 (mm) of the first region and the plate thickness t (mm), and the first side surface and the intermediate reference surface are formed. The largest inclination angle θ ₁ (°) has a relationship of 1 ≦ (H1 / t) ≦ −3θ ₁ +272, and the protrusion height H2 (mm) of the second region and the plate thickness t (mm) Ratio H2 / t and the largest inclination angle θ ₂ (°) formed by the second side surface and the intermediate reference surface preferably have a relationship of 1 ≦ (H2 / t) ≦ −3θ ₂ +272. (Claim 9).

When the ratio H1 / t is less than 1, there may be a problem that the effect of improving the rigidity by forming the first region cannot be obtained sufficiently. On the other hand, when the ratio H1 / t exceeds −3θ ₁ +272, there is a possibility that a problem that molding becomes difficult may occur. Similarly, when the ratio H2 / t is less than 1, there may be a problem that the effect of improving the rigidity by forming the first region cannot be sufficiently obtained. On the other hand, when the ratio H2 / t exceeds −3θ ₂ +272, there is a possibility that a problem that molding becomes difficult may occur.

Moreover, in the laminated structure of the second invention, a laminate having a three-layer structure composed of one flat face plate disposed on both sides of the plate having the concavo-convex portion as one core material, can do. Moreover, it is also possible to have a structure in which such a basic structure is repeated, that is, a multilayer structure in which a plurality of plate members having the above-described uneven portions are laminated on each other via a flat face plate.
Alternatively, a structure in which a plate material having a plurality of uneven portions is directly laminated to form a core material, and a flat face plate is bonded to the surface of one side or both sides thereof can also be adopted.
Moreover, it can also be set as the laminated structure of the state which only laminated | stacked the board | plate material which has a several uneven | corrugated | grooved part directly.
The number of laminated plate members can be changed according to the application and required characteristics.

The vehicle panel of the third invention is not limited to automobile hoods, but can be applied to panels and reinforcing members such as doors, roofs, floors and trunk lids, and energy absorbing members such as bumpers, crash boxes and door beams. Moreover, a steel plate, an aluminum alloy plate, etc. can be used as the outer panel and the inner panel.
When the outer panel is made of an aluminum alloy plate, for example, a 6000 series alloy is preferable because it is relatively inexpensive. When the inner panel is made of an aluminum alloy plate, for example, a 5000 series alloy plate is preferable because of its relatively good formability.

Example 1
The board | plate material 1 which has the uneven | corrugated | grooved part 20 concerning the Example of 1st invention is demonstrated using FIGS. 1-4.
FIG. 1 shows a plan view of a part of the uneven portion 20. In the same figure, the outlines of the first region 21 and the second region 22 on the intermediate reference plane, which do not appear as outlines, are indicated by broken lines (the same applies to FIGS. 3 and 11 described later).
FIG. 4 shows the shape of the concavo-convex portion 20 of the plate 1 by the arrangement of the first reference region 213 and the second reference region 223 on the intermediate reference plane K3 (the same applies to FIGS. 8 and 9 described later). Is).

The plate material 1 having the concavo-convex portion 20 of this example is a plate material having increased rigidity by forming the concavo-convex portion 20 as shown in FIGS.
The uneven portion 20 is configured as follows.
Three reference planes, ie, a first reference plane K1, an intermediate reference plane K3, and a second reference plane K2, which are three virtual planes sequentially arranged in parallel at intervals, are used as a reference.

  As shown in FIG. 4, it is assumed that the intermediate reference plane K3 is formed by laying a first unit area 231 and a second unit area 232 that are virtual squares, and one of the two directions along the sides of the virtual square is defined. Let the horizontal direction (X direction) and the other be the vertical direction (Y direction). The first unit area 231 is divided into three in the horizontal direction at a ratio A: B: A = 1: 1: 1, and the two areas divided into the ratio A are defined as the first divided area 214 and divided into the ratio B. One area is defined as a second divided area 224. The second unit area 232 is divided into three parts in the vertical direction at a ratio A: B: A = 1: 1: 1, and the two areas divided into the ratio A are defined as a second divided area 224 and divided into a ratio B. One of the areas is referred to as a first divided area 214. In the intermediate reference plane K <b> 3, the first unit region 231 and the second unit region 232 are alternately arranged in the vertical direction and the horizontal direction, and a substantially I-shaped region formed by the adjacent first divided regions 214. Is a first reference region 213, and a region having a substantially I shape formed by the adjacent second divided regions 224 is a second reference region 223.

  As shown in FIGS. 1 to 3, the concavo-convex portion 20 includes a first region 21 projecting from the first reference region 213 defined on the intermediate reference surface K3 toward the first reference surface K1, and the intermediate reference surface K3. And a second region 22 projecting from the second reference region 223 defined in step 2 toward the second reference surface K2. The first region 21 includes a first top surface 211 obtained by projecting the first reference region 213 on the first reference surface K1 with the same magnification or reduction, the contour of the first top surface 211, and the contour of the first reference region 213. And a first side surface 212 connecting the two. In addition, the second region 22 includes a second top surface 221 obtained by projecting the second reference region 223 on the second reference surface K2 with the same magnification or reduction, the contour of the second top surface 221, and the second reference region 223. It consists of a second side 222 connecting the contour.

As shown in FIG. 2, the three reference surfaces of the first reference surface K1, the intermediate reference surface K3, and the second reference surface K2 in this example are parallel planes. The first top surface 211 is configured such that the thickness center thereof overlaps with the first reference plane K1, and the second top surface 221 is configured so that the thickness center thereof overlaps with the second reference plane K2. Yes. The distance formed by the first reference plane K1 and the intermediate reference plane K3 is defined as a projection height H1 (mm), and the distance defined by the second reference plane K2 and the intermediate reference plane K3 is defined as a projection height H2 (mm).
Moreover, in this example, the 1st area | region 21 and the 2nd area | region 22 have the same shape and dimension, and only a protrusion direction differs. The protrusion height H1 (mm) of the first region 21 and the protrusion height H2 (mm) of the second region 22 were both 1.5 mm.

Moreover, the board | plate material 1 which has the uneven | corrugated | grooved part 20 of this example is a 1000 series aluminum flat plate with board thickness t = 0.3mm.
The uneven portion 20 is formed by press molding using a pair of molds. In addition, this shaping | molding method can also employ | adopt other plastic processing methods, such as roll shaping | molding formed with a pair of shaping | molding roll which provided the desired uneven | corrugated shape on the surface.

Further, as shown in FIG. 2, the inclination angle θ ₁ (°) of the first side surface 212 with respect to the intermediate reference plane K3 and the inclination angle θ ₂ (°) of the second side surface 222 with respect to the intermediate reference plane K3 are both 30 °, The first side surface 212 and the second side surface 222 are formed continuously in one plane without having a bent portion.

In this example, as shown in FIG. 4, the length L of one side of the first unit region 231 and the second unit region 232 forming the intermediate reference plane K3 is L = 24 mm.
Further, the ratio L / t between the length L (mm) of one side of the first unit region 231 and the second unit region 232 and the plate thickness t (mm) of the aluminum plate is 80, which is in the range of 10 to 2000. Is in.
Also, the length B _L of the rectangular shape formed by the region divided into the ratio B is 8 mm with respect to the length L (mm) of one side of the first unit region 231 and the second unit region 232, and 4 .8 ≦ B _L ≦ 14.4.

Further, the ratio H1 / t between the protruding height H1 (mm) of the first region 21 and the plate thickness t (mm) is 5. Further, the inclination angle θ ₁ = 30 ° formed by the first side surface 212 and the intermediate reference plane K3 is −3θ ₁ + 272 = 182. Therefore, the relationship 1 ≦ H1 / t ≦ −3θ ₁ +272 is satisfied. Similarly, the ratio H2 / t between the protruding height H2 (mm) of the second region 22 and the plate thickness t (mm) is 5. Further, the inclination angle θ ₂ = 30 ° formed by the second side surface 222 and the intermediate reference surface K3 is −3θ ₂ + 272 = 182. Therefore, the relationship of 1 ≦ H2 / t ≦ −3θ ₁ +272 is satisfied.

  The board | plate material 1 which has the uneven | corrugated | grooved part 20 in this example has the uneven | corrugated | grooved part of the above special shapes. That is, the concavo-convex portion 20 includes a first region 21 protruding from the first reference region 213 defined on the intermediate reference surface K3 toward the first reference surface K1, and a second reference region defined on the intermediate reference surface K3. And a second region 22 projecting from 223 toward the second reference plane K2. The first region 21 includes a first top surface 211 and a first side surface 212 that connects the contour of the first top surface 211 and the contour of the first reference region 213, and the second region 22 includes the second top surface. 221 and a second side surface 222 that connects the contour of the second top surface 221 and the contour of the second reference region 223.

  The first region 21 and the second region 22 include a first top surface 211 and a second top surface 221 that are arranged at positions separated in the thickness direction of the plate material 1, and a first side surface 212 that intersects the thickness direction of the plate material 1. And a second side 222, and many materials can be arranged at a position away from the neutral plane. Therefore, many materials can be effectively used as the strength member, and the rigidity improvement effect and energy absorption characteristics can be greatly enhanced.

Further, the area formed by the first reference region 213 and the second reference region 223 is the same. Further, the inclination angles θ ₁ and θ ₂ formed by the first side surface 212 and the second side surface 222 with respect to the intermediate reference plane K3 are made the same, and the projecting heights H1 and H2 of the first region 21 and the second region 22 are also made the same. Therefore, the shape of the 1st field 21 and the 2nd field 22 which protrude on the front and back of board 1 is also the same. Therefore, the rigidity can be improved more effectively.
In addition, it is possible to obtain an effect of improving the damping performance accompanying the improvement of rigidity and an effect of suppressing sound echo due to the uneven shape.

  In order to quantitatively determine the effect of improving the rigidity of the plate 1 of Example 1, a bending rigidity evaluation by a cantilever beam by FEM analysis and a bending rigidity evaluation by a three-point bending test were performed.

(FEM analysis)
In order to quantitatively judge the rigidity improvement effect and energy absorption characteristics of the plate material 1 of Example 1, bending rigidity evaluation by a cantilever beam was performed by FEM analysis.
As shown in FIG. 1, FEM analysis of bending rigidity evaluation by a cantilever has one end as a fixed end (Z1, Z3), the other end as a free end (Z2, Z4), and a load of 1N at the center of the free end. The amount of deflection at the time of applying was determined.
The shape of the test piece has a rectangular shape of 120 mm × 120 mm, and the uneven portion 20 shown in this example is formed on the entire surface. The forming direction of the concavo-convex portion 20 is an angle formed by one side of the test piece and one side of the virtual square in the unit region, which is 0 °, 15 °, 30 °, 45 °, 60 °, 75 °, and 90 °. The direction was changed. Moreover, it was set as plate | board thickness t = 0.274 mm after plate shaping | molding from the increase rate of a surface area. Note that the fixed end Z1 and the free end Z2 shown in FIG. 1 indicate the 0 degree direction, and the fixed end Z3 and the free end Z4 indicate the fixed end and the free end in the 90 ° direction.
The evaluation was performed by comparing the amount of deflection obtained by performing the same FEM analysis on a flat base plate on which the uneven portion 20 was not formed.

The results of the FEM analysis are shown in a graph (FIG. 5) in which the horizontal axis is the angle and the vertical axis is the rate of improvement in bending rigidity.
As a result, the stiffness improvement rate (P1, P2) in the 0 ° direction and the 90 ° direction is the highest at 22.9, and the stiffness improvement rate (P3) in the 45 ° direction is the lowest at 15.4 times. It became clear. Moreover, it has been clarified that the shape of the concavo-convex portion 20 shown in this example has a very high rigidity improvement rate in any direction of formation.

(3-point bending test)
As shown in FIG. 6, the three-point bending test is performed by placing test pieces on two fulcrums W configured by arranging two laid down cylindrical support members in parallel so that the distance between fulcrums S = 120 mm. A load was applied to the center position on one surface by a flat plate-shaped pressing jig J having a semicircular tip section, and the amount of displacement was measured. Evaluation was performed by similarly performing a three-point bending test on a flat base plate on which the concavo-convex portion 20 was not formed, and comparing load-displacement diagrams.

  The test piece is an A1050-O material having a shape before molding of 100 mm × 150 mm and a plate thickness t = 0.3 mm, and the uneven portion 20 shown in this example is formed on the entire surface. In the test piece, the formation direction of the concavo-convex portion 20 is the same as in the 0 ° direction and 45 ° direction of FEM analysis in the cantilever.

  FIG. 7 shows a load-displacement diagram with the load obtained from the result of the three-point bending test as the vertical axis and the displacement as the horizontal axis. In the figure, the measurement result of the plate 1 provided with the concavo-convex portion 20 in the 45 ° direction is a solid line X, the measurement result of the plate 1 provided with the concavo-convex portion 20 in the 0 ° direction is the solid line Y, and the measurement result of the flat base plate. Is indicated by a solid line Z.

As shown in FIG. 7, the solid line X has a rising inclination angle 12.1 times that of the solid line Z. Therefore, it was clarified that the bending rigidity of the plate 1 provided with the concavo-convex portions 20 in the 45 ° direction is improved 12.1 times compared to the flat plate-like base plate. Further, the solid line Y has a rising inclination angle of 15.4 times that of the solid line Z. Therefore, it has been clarified that the bending rigidity of the plate 1 provided with the concavo-convex portion 20 in the 0 ° direction is improved 15.4 times as compared with the flat base plate.
Further, since the product of the load and the displacement becomes an energy amount (work amount) for deforming the plate material, the solid line X and the solid line Y are deformed compared to the solid line Z as shown in the load-displacement diagram of FIG. It can be seen that the amount of energy required is high. Therefore, it has been clarified that the shape of the concavo-convex portion 20 shown in this example greatly improves the amount of energy absorption with respect to the flat base plate.

(Example 2)
As shown in FIG. 8, this example is a modification of the plate material 1 having the uneven portion 20 of the first embodiment.
The plate 1 having the concavo-convex portion 20 made of the intermediate reference plane K3 shown in FIG. 8 is an example in which the division ratio in the first unit region 231 and the second unit region 232 is changed. The first unit area 231 is horizontally divided into three ratios A: B: A = 1: 2: 1. The area divided into the ratio A is defined as the first divided area 214, and the area divided into the ratio B is defined as the first unit area 231. The second divided area 224 is assumed. The second unit area 232 is divided into three parts in the vertical direction at a ratio A: B: A = 1: 2: 1, and the area divided into the ratio A is defined as a second divided area 224 and divided into the ratio B. In this example, the area is the first divided area 214.

The plate member 1 having the concavo-convex portion 20 of the present example has the first reference surface K1 and the second reference surface K2 from the first reference region 213 and the second reference region 223 defined on the intermediate reference surface K3 shown in FIG. The first region 21 and the second region 22 project from each other. Other configurations are the same as those of the first embodiment.
Also in this example, the same effect as Example 1 is exhibited.

(Example 3)
In this example, as shown in FIG. 9, in the plate 1 having the concavo-convex portion 20 of Example 2, after the first reference region 213 and the second reference region 223 are defined on the intermediate reference surface K3, the areas of both change. This is an example in which a part of the corners of both is deformed into an arc shape so as not to occur. Specifically, as shown in the figure, the four convex corners a1 formed by the outline of the first reference region 213 and the four convex corners a2 formed by the second reference region 223 are Is also deformed into an arc with the same radius of curvature.

In this example, the concavo-convex portion 20 protruding from the first reference surface K1 and the second reference surface K2 is formed from the first reference region 213 and the second reference region 223 shown in FIG. Other configurations are the same as those of the first embodiment.
In this example, since the corner | angular part of the unevenness | corrugation of the board | plate material 1 which has the uneven | corrugated | grooved part 20 can be made smooth, while forming becomes easy, the expansion of a use and improvement of design property can be aimed at.
In addition, the same effects as those of the first embodiment are obtained.

Example 4
In this example, as shown in FIG. 10, the concavo-convex portion 20 is provided in the cylindrical material 11. In this example, the first reference plane K1, the intermediate reference plane K3, and the second reference plane K2 are formed of cylindrical curved surfaces that are sequentially arranged in parallel. The unit shape of the concavo-convex portion 20 is obtained by projecting the unit shape 23 shown in Example 4 onto the intermediate reference plane K3 along the curved surface formed by the intermediate reference plane K3. Other configurations are the same as those of the first embodiment.
As shown in this example, the plate member 1 having the excellent uneven portion 20 having high rigidity can be deformed into various shapes, and the application can be expanded. In addition, the same effects as those of the first embodiment are obtained.

  Moreover, rigidity can be improved without increasing the plate | board thickness of material by using the cylindrical material 11 which has the uneven | corrugated | grooved part 20 shown in this example for cylindrical structures, such as a drink can and a rocket. Further, the cylindrical material 11 of this example has excellent energy absorption characteristics. Therefore, high rigidity and the outstanding energy absorption characteristic can be provided by using for members, such as a motor vehicle.

(Example 5)
In this example, as shown in FIG. 11, the laminated structure 5 is configured using the plate material 1 having the uneven portion 20 of Example 1 as a core material.
That is, the laminated structure 5 is formed by bonding the face plates 42 and 43 to the surfaces on both sides of the core material made of the single plate material 1 having the uneven portion 20.
The face plates 42 and 43 are made of an aluminum alloy plate having a material of 3000 series and a plate thickness of 1.0 mm.

The laminated structure 5 of this example uses the plate material 1 having the uneven portion 20 having excellent rigidity as described above as a core material, and the first top surface 211 of the first region 21 and the second region 22 of the second region 22. By bonding the face plates 42 and 43 to the top surface 221 by bonding, brazing, or the like, the laminated structure 5 having a remarkably higher rigidity than that of a single plate material having the uneven portion 20 is obtained. Moreover, since both the plate 1 and the face plates 42 and 43 are made of an aluminum alloy plate, the weight can be reduced.
In addition, it is possible to obtain the effect of improving the damping property accompanying the improvement of rigidity and the effect of improving the sound absorption by enclosing the air layer. As is well known, by forming a through hole in one of the face plates 42 and 43, a Helmholtz type sound absorbing structure is obtained, and the sound absorbing property can be further improved.
In addition, as the face plate, a metal plate other than an aluminum alloy, for example, a steel plate, a titanium plate, a resin plate, or the like can be applied.

(Example 6)
In this example, as shown in FIG. 12, the plate material 1 described in the first to third embodiments is used as an inner panel, and the first top surface 211 of the first region 21 is arranged toward the back side of the outer panel 61. It is an example of the vehicle panel 6 comprised. The inner panel is joined to the outer panel 61 at the outer peripheral portion by hem processing or the like.

In the vehicle panel 6 of this example, since the plate 1 having the concavo-convex portion 20 constituting the inner panel is excellent in the rigidity improving effect as described above, the energy of the primary collision and the secondary collision when the pedestrian collides. It is excellent in the property of absorbing the energy. In addition, it is possible to obtain the effect of improving the damping property accompanying the improvement of rigidity and the effect of improving the sound absorption by enclosing the air layer.
In addition, in this example, although the board | plate material 1 which has the uneven | corrugated | grooved part 20 was used as an inner panel, it can be used for any one or both of an inner panel and an outer panel.

1 Board 1
20 Concavity and convexity 21 First region 211 First top surface 212 First side surface 213 First reference region 214 First divided region 22 Second region 221 Second top surface 222 Second side surface 223 Second reference region 224 Second divided region 231 First unit area 232 Second unit area

Claims (11)

It is a plate material that has increased rigidity by forming uneven portions,
The concavo-convex portion is based on three reference planes, a first reference plane, an intermediate reference plane, and a second reference plane, which are virtual three planes sequentially arranged in parallel at intervals.
Assuming that the intermediate reference plane is laid out with a first unit area and a second unit area which are virtual squares, one of two directions along two orthogonal sides of the virtual square is horizontal and the other is If the vertical direction,
The first unit area is divided into three in the horizontal direction at an arbitrary ratio A: B: A, two areas divided into the ratio A are defined as the first divided areas, and one area divided into the ratio B is defined as the first area. A two-part area,
The second unit area is divided into three in the vertical direction at an arbitrary ratio A: B: A, the two areas divided into the ratio A are defined as the second divided areas, and the one area divided into the ratio B is defined as the second area. One divided area,
In the intermediate reference plane, the first unit area and the second unit area are alternately arranged in the vertical direction and the horizontal direction, and a substantially I-shaped area formed by the adjacent first divided areas Is a first reference region, and a region that is substantially I-shaped formed by the adjacent second divided region is a second reference region,
A first region projecting from the first reference region defined on the intermediate reference surface toward the first reference surface; and a second reference surface defined from the second reference region defined on the intermediate reference surface. A second region projecting toward the
The first region includes a first top surface obtained by projecting the first reference region on the first reference surface with the same magnification or reduction, an outline of the first top surface, and an outline of the first reference region. The first side to be connected,
The second region includes a second top surface obtained by projecting the second reference region on the second reference surface with the same magnification or reduction, an outline of the second top surface, and an outline of the second reference region. The board | plate material which has an uneven | corrugated | grooved part characterized by consisting of a 2nd side surface to connect.   3. The plate having an uneven portion according to claim 1, wherein the first reference region and the second reference region are changed in area after connecting the first divided region and the second divided region, respectively. The board | plate material which has an uneven | corrugated | grooved part characterized by being comprised by changing a part of both corner | angular part into circular arc shape so that it may not do. 3. The plate member having an uneven portion according to claim 1 or 2, wherein an inclination angle θ ₁ (°) of the first side surface with respect to the intermediate reference surface and an inclination angle θ ₂ (°) of the second side surface with respect to the intermediate reference surface. Is a plate material having an uneven portion, characterized by being in the range of 10 ° to 90 °.   In the board | plate material which has an uneven | corrugated | grooved part of any one of Claims 1-3, at least one part of the said 1st reference plane, the said intermediate | middle reference plane, and the said 2nd reference plane which were sequentially arranged from a parallel curved surface, respectively. The board | plate material which has an uneven | corrugated | grooved part characterized by becoming.   5. The plate material having an uneven portion according to claim 1, wherein the plate material is formed by press-molding a metal plate to form the uneven portion. .   6. The plate material having an uneven portion according to claim 5, wherein a thickness t (mm) of the metal plate before forming is 0.05 to 6.0 mm.   The plate material having an uneven portion according to claim 5 or 6, wherein a ratio L / t of a length L (mm) of one side of the unit region made of a virtual square to the plate thickness t (mm) is 10 A plate material having a concavo-convex portion, which is ˜2000. In the board | plate material which has an uneven | corrugated | grooved part as described in any one of Claims 5-7, the rectangle which the area | region divided | segmented into the ratio B makes | forms the length L (mm) of one side of the said unit area which consists of a virtual square. 1. A plate 1 having an uneven portion, wherein 0.2 _L ≦ B _L ≦ 0.6 _L , where B _L (mm) is the length of the short side of the shape. In the board | plate material which has an uneven | corrugated | grooved part as described in any one of Claims 5-8, ratio H1 / t of the protrusion height H1 (mm) of the said 1st area | region and the said board thickness t (mm), and the said 1st The largest inclination angle θ ₁ (°) formed by one side surface and the intermediate reference surface has a relationship of 1 ≦ (H1 / t) ≦ −3θ ₁ +272, and the protrusion height H2 (mm) of the second region. ) And the plate thickness t (mm), and the largest inclination angle θ ₂ (°) formed by the second side surface and the intermediate reference surface is 1 ≦ (H2 / t) ≦ −. A plate material having a concavo-convex portion, characterized by having a relationship of 3θ ₂ +272.   A laminated structure formed by laminating a plurality of plate members, wherein at least one of the plate members is a plate member having an uneven portion according to any one of claims 1 to 9. .   It is a vehicle panel which has an outer panel and the inner panel joined to the back surface of this outer panel, Comprising: Either one or both of the said outer panel and the said inner panel are any one of Claims 1-9. A vehicle panel comprising a plate having an uneven portion.

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