JP2011027248A - Plate material having irregular part and method for designing irregular shape thereof - Google Patents

Abstract

The present invention provides a plate material that has improved rigidity by providing uneven portions, and has a pattern of uneven portions that has a higher rigidity improving effect than before.
An uneven portion 2 is formed by combining a large number of three types of regions, a first region 21, a second region 22 and a third region 23, having different protruding heights in the thickness direction. Each region is distributed and arranged such that each region is in contact with the other two different types of regions without continuously connecting the same type of regions. The first regions 21 are regularly distributed in correspondence with the positions of the hexagonal center points and the lattice points constituting the virtual hexagonal lattice, and the second regions 22 are adjacent first regions. The third regions 23 are distributed and arranged at positions surrounded by the first region 21 and the second region 22.
[Selection] Figure 3

Description

  The present invention relates to a plate material having increased rigidity by forming an uneven portion.

For example, in the automobile, for the purpose of reducing the weight, it has been studied to replace a material of a component made of a steel plate or the like with a light material such as an aluminum alloy plate. In this case, it is necessary to ensure the required rigidity as a premise for weight reduction.
Heretofore, in order to improve the rigidity of the plate material without increasing the plate thickness, 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 convex portions 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 the rigidity by forming an uneven | corrugated | grooved part by embossing etc. in various uses is proposed (patent documents 2-6).

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 in the above-mentioned 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 having no uneven portions. However, it has not been clarified yet what the optimum uneven shape is for improving the rigidity without increasing the plate thickness. And it is always requested | required to make rigidity improvement ratio higher than before.
Further, there is a demand for reducing the weight of components made of plate materials as much as possible in various mechanical devices and the like as well as automobiles. 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 plate shape), a rigidity improvement request | requirement exists regardless of a material.

  The present invention has been made in view of such problems, and is a plate material that has improved rigidity by providing uneven portions, and has a pattern of uneven portions that has a higher rigidity improving effect than the conventional plate material. It is what.

The present invention is a plate material having increased rigidity by forming an uneven portion,
The concavo-convex portion is configured by combining a large number of three types of regions, a first region, a second region, and a third region, having different protrusion heights in the thickness direction.
The first region, the second region, and the third region are arranged in a distributed manner such that each region is always in contact with two different types of regions without continuously connecting the same type of regions,
The first regions are regularly distributed in correspondence with the center points of the hexagons constituting the virtual hexagonal lattice and the positions of the lattice points.
The second regions are arranged in a distributed manner so as to connect the adjacent first regions,
The third region is a plate material having an uneven portion, characterized in that the third region is dispersedly arranged at a position surrounded by the first region and the second region.

  As described above, the plate material of the present invention has three types of regions, ie, a first region, a second region, and a third region, which have different protrusion heights in the thickness direction, as uneven portions. These are distributed in a distributed manner without continuously connecting the same type of regions. In addition, each area is distributed and arranged so as to be in contact with other two different areas. Further, the first region is regularly distributed corresponding to the center point of each hexagon constituting the virtual hexagonal lattice and the position of each lattice point, and the second region is adjacent to the adjacent region. The first regions are dispersedly arranged so as to connect each other, and the third region is dispersedly disposed at a position surrounded by the first region and the second region.

By making such a configuration an essential requirement, it is possible to obtain an unprecedented rigidity improvement effect of the plate material. In particular, the arrangement of the first region is regularly distributed in accordance with the center point of the virtual hexagonal lattice and the position of each lattice point, thereby reducing the directionality, that is, in which direction the bending load Even if applied, a substantially uniform rigidity improvement effect can be obtained. As the virtual hexagonal lattice, a regular hexagonal lattice is most preferable, but a hexagonal lattice slightly collapsed from the regular hexagon can be employed as long as the uniform rigidity improving effect is not substantially reduced.
The reason why the rigidity improvement effect can be obtained is considered as follows.

  In the present invention, there are three types of protrusion heights as the concavo-convex portions, none of the types is continuous, and each region is always in contact with two different types of regions. For example, the outer periphery of one first region is always in contact with several second and third regions. In other words, the outer periphery of each first region is surrounded by the second region and the third region. Similarly, the outer periphery of each second region is surrounded by the first region and the third region. Further, the outer periphery of each third region is surrounded by the first region and the third region. In each region, the same type is distributed and arranged without being continuous.

  By making each region constituting the concavo-convex part distributed as described above, when the stress transmitted to one region is transmitted in the surface direction, a boundary portion between the outer peripheral portion and another different region is surely formed. I must pass. Here, the boundary part between different areas is a highly rigid part that changes in shape in the thickness direction. Therefore, it is thought that the rigidity improvement effect as a whole can be enhanced.

  Further, as described above, the reason why the directionality of the rigidity improvement effect is small is that the arrangement of the first region corresponds to the center point of each hexagon and the position of each lattice point constituting the virtual hexagonal lattice. By regularly distributing and arranging, the second region and the third region between them are also arranged along the center point of the hexagonal shape, and exhibit characteristics close to a circular shape with no overall directionality, This is because a rigidity improvement effect can be obtained in any direction.

  On the other hand, for example, even when a conventional convex shape as described in Patent Document 1 is provided, if the peripheral portion of the convex portion is continuously present in a net shape with the same protruding height, as in the present invention. It is considered that such an effect cannot be obtained sufficiently.

And the structure of said uneven | corrugated | grooved part cannot be implement | achieved only by two types of protrusion height of the thickness direction differing, but it can implement | achieve only by making it 3 types positively.
As described above, according to the present invention, it is possible to provide a plate material having improved unevenness by providing uneven portions, and having a pattern of uneven portions having a higher rigidity improving effect than before.

FIG. 3 is a plan view showing the plate material 1 in the first embodiment. FIG. 3 is an explanatory plan view showing the shape of the concavo-convex part in Example 1. The perspective view which shows the shape of the uneven | corrugated | grooved part in Example 1 (perspective view between CC of FIG. 2, DD). Sectional drawing which shows the protrusion height of an uneven | corrugated | grooved part in Example 1 (EE sectional view taken on the line E-E of FIG. 3). FIG. 3 is an explanatory diagram illustrating a dimensional relationship of each region of the uneven portion in the first embodiment. FIG. 6 is an explanatory diagram showing a reference triangle in the second embodiment. FIG. 6 is an explanatory diagram illustrating a state in which each side of a reference triangle is inverted and transferred around a line symmetrical center in Example 2. FIG. 6 is an explanatory diagram illustrating a state in which each side of each reference triangle that has been inverted and transferred is inverted and transferred around the center of line symmetry in the second embodiment. FIG. 10 is an explanatory diagram showing a result of repeating inversion transfer around each side of a reference triangle as a center of line symmetry in Example 2 a number of times. Explanatory drawing which shows the shape of the strip-shaped board | plate material used for evaluation in Example 3. FIG. The perspective view which shows the shape of an uneven | corrugated | grooved part in Example 4. FIG. Sectional drawing which shows the protrusion height of an uneven | corrugated | grooved part in Example 4 (F-F arrow sectional drawing of FIG. 11). The perspective view which shows the shape of an uneven | corrugated | grooved part in Example 5. FIG. Sectional drawing which shows the protrusion height of an uneven | corrugated | grooved part in Example 5 (GG sectional view taken on the line of FIG. 11).

  In the present invention, the protruding height of each of the above-described regions does not necessarily need to be a planar region having the same protruding height over the entire area. As will be described later, the protruding height may change within the region. The distinction between the above regions can be determined at the boundary between these regions. This is because a difference in level is always generated when the boundary between the regions, that is, the height of the outer peripheral portion of each region is different. If there is no level difference, it will be the same area connected in a plane.

In addition, the concavo-convex portion can be formed by performing plastic working such as press molding or roll molding if it is an extensible metal plate, and it can be formed by injection molding or hot pressing if it is a resin material or the like. be able to.
Moreover, it can be arbitrarily set which area | region protrudes most among the said 1st-3rd area | regions, and which area | region becomes a neutral surface close | similar to the center of a thickness direction, and is specific of each area | region. The protrusion height can be set as appropriate within the moldable range.

  In addition, it is preferable that at least one of the first region, the second region, and the third region has a protruding height that changes within the region. That is, the surfaces in each region do not have to have the same protruding height on the entire surface, and may have a gradually raised shape or a gradually depressed shape. By adding such a change in the protruding height in each region, it can be expected that the effect of improving the rigidity is further enhanced.

Moreover, the said uneven | corrugated | grooved part uses a reference | standard triangle as a unit shape,
The reference triangle has a first vertex, a second vertex and a third vertex and a first side connecting the second vertex and the third vertex, a second side connecting the first vertex and the third vertex; and It has a third side connecting the first vertex and the second vertex, the interior angle of the first vertex is 30 °, the interior angle of the second vertex is 90 °, and the interior angle of the third vertex is 60 ° Shall be
The inside of the reference triangle is partitioned into three parts: a first reference region including the first vertex, a second reference region including the second vertex, and a third reference region including the third vertex,
Each of the sides of the reference triangle is inverted and transferred around it as a center of line symmetry, and each of the sides of each of the inverted reference triangles is inverted and transferred around it as a center of line symmetry. It is preferable that a group of regions is designed by using the first region, a group of the second reference regions as the second region, and a group of the third reference regions as the third region. ).

That is, as an invention of the design method of the uneven portion shape in the plate material having the uneven portion, it is a method of designing the shape of the uneven portion in the plate material having the uneven portion,
Using a reference triangle as the unit shape,
The reference triangle has a first vertex, a second vertex and a third vertex and a first side connecting the second vertex and the third vertex, a second side connecting the first vertex and the third vertex; and It has a third side connecting the first vertex and the second vertex, the interior angle of the first vertex is 30 °, the interior angle of the second vertex is 90 °, and the interior angle of the third vertex is 60 ° Shall be
The inside of the reference triangle is partitioned into three parts: a first reference region including the first vertex, a second reference region including the second vertex, and a third reference region including the third vertex,
Each of the sides of the reference triangle is inverted and transferred around it as a center of line symmetry, and each of the sides of each of the inverted reference triangles is inverted and transferred around it as a center of line symmetry. The shape of the concavo-convex portion in the plate material having the concavo-convex portion, wherein the group of regions is the first region, the group of the second reference regions is the second region, and the group of the third reference regions is the third region. There is a design method of (Claim 12).

  In this design method, if the shape of one reference triangle is determined, the overall shape can be determined as a regular uneven shape. And since the whole shape can be easily changed by changing the said 1st-3rd reference | standard area | region in the said reference | standard triangle, a design change is also easy.

  Moreover, it is preferable that the said board | plate material forms the said uneven | corrugated | grooved part by plastically processing a metal plate (Claims 4 and 13). The metal plate can be easily formed with uneven portions by performing plastic working such as embossing, other press forming or roll forming. Therefore, in the case of a metal plate, it is relatively easy to apply the above-described excellent form to the uneven portion.

When the metal plate is plastically processed by press forming or roll forming, the thickness of each portion of the concavo-convex portion slightly decreases due to the influence of forming. Therefore, it is easy and reasonable to manage the dimensions of the product by the thickness before plastic working.
The thickness t of the metal plate before plastic working is preferably in the range of 0.1 mm to 6.0 mm. When the thickness of the metal plate is less than 0.1 mm or more than 6.0 mm, there is little need for the effect of improving the rigidity in terms of use.

It is preferable that the thickness t of the metal plate before plastic working and the length L of the first side in the reference triangle have a relationship of t / L ≦ 0.2 (claims 5 and 14).
When the above (t / L) exceeds the upper limit, plastic working may be difficult. On the other hand, the lower limit of the above (t / L) is not particularly limited, but the unit shape of the unevenness may become too large, making it difficult to handle practically, and the effect of improving the rigidity may not be sufficiently obtained. Therefore, it is preferable to set 0.02 as the lower limit.

In the reference triangle, the area S1 of the first reference region and the area S3 of the third reference region preferably have a relationship of 0.4 ≦ S1 / S3 ≦ 5.9. 6, 15).
When the above (S1 / S3) is less than the lower limit value, the rigidity improvement effect may be reduced. On the other hand, when the upper limit value is exceeded, the rigidity improvement effect may be reduced. Therefore, more preferably, 0.4 ≦ S1 / S3 ≦ 2.5, and further preferably 0.7 ≦ S1 / S3 ≦ 1.3.

Further, in the reference triangle, the area S1 of the first reference region, the area S2 of the second reference region, and the area S3 of the third reference region are 0.02 ≦ S2 / S1 ≦ 1.0, It is preferable that the relationship 0.04 ≦ S2 / S3 ≦ 1.0 is satisfied (claims 7 and 16).
When (S2 / S1) is less than the lower limit, plastic working may be difficult. On the other hand, when (S2 / S1) exceeds the upper limit, a rigidity improvement effect is not obtained so much. Plastic processing may also be difficult. Similarly, if (S2 / S3) is less than the lower limit, plastic working may be difficult, whereas if (S2 / S3) exceeds the upper limit, the effect of improving the rigidity is not obtained. In other words, plastic processing may be difficult.

  The shape of the concavo-convex part of the present invention is 3 of the most protruding convex region (first region or third region), the most concave concave region (third region or first region), and the intermediate region (second region). There are two regions, but as is well known in material mechanics, the greater the moment of section, the higher the bending stiffness. As the material is present at a position farther from the neutral plane (second region) of the cross section, the second moment of the cross section becomes higher. Therefore, the area of the uneven surface (first region and third region) that is not the neutral surface The rigidity tends to be higher when the area of the neutral surface (second region) is decreased by increasing. Moreover, when the total area of the uneven surfaces (the first region and the third region) excluding the neutral surface is equal, the concave region (the first region or the third region) and the convex region (the third region or the first region) The rigidity tends to be higher when the areas are made closer to each other.

  Further, the reference triangle includes the first reference line, the second perpendicular line and the third perpendicular line respectively hanging from the reference point to the first side, the second side and the third side, respectively. And the third reference region, the first reference region and the third reference region, and the first reference region and the second reference region are preferably partitioned (claims). Item 8, 17). In this case, the design can be easily performed.

Further, the length L of the first side, the length X of the third perpendicular line, and the thickness t of the metal plate before plastic working are 0.1 ≦ X / L ≦ 0.4. , X> t (claims 9 and 18).
When the above (X / L) is less than the lower limit, plastic working may be difficult. On the other hand, when the upper limit is exceeded, sufficient rigidity improvement effect cannot be obtained, and plastic working is also difficult. May be difficult. Further, when X is equal to or less than the thickness t, plastic working may be difficult.

Further, the length L of the first side, the length Y of the first perpendicular line, and the thickness t of the metal plate before plastic working in the reference triangle are 0.1 ≦ Y / L ≦ 0.8. , Y> t (claims 10 and 19).
When the above (Y / L) is less than the above lower limit value, plastic working may be difficult. On the other hand, when the above upper limit value is exceeded, sufficient rigidity improvement effect cannot be obtained, and plastic working is also difficult. May be difficult. Further, when Y is less than or equal to thickness t, plastic working may be difficult.

  The dividing line connecting the reference point and each side can be an arbitrary straight line or an arbitrary curved line instead of the above vertical lines.

The plate material is preferably an aluminum alloy plate made of aluminum or an alloy thereof.
An aluminum alloy plate is widely recognized as a lightweight material, and it is very effective to improve the rigidity by applying the present invention thereto.

Example 1
The board | plate material which has an uneven | corrugated | grooved part concerning the Example of this invention is demonstrated using FIGS.
As shown in FIGS. 1 to 4, the plate material 1 having an uneven portion according to this example is a plate material having increased rigidity by forming the uneven portion 2.
The concavo-convex portion 2 is configured by combining a large number of three types of regions, that is, a first region 21, a second region 22, and a third region 23 having different protrusion heights in the thickness direction.
The first region 21, the second region 22, and the third region 23 are dispersedly arranged so that the same type of regions are not continuously connected, and each region is always in contact with two different types of regions. ing.

Further details will be described below.
The plate material 1 is made of an aluminum alloy plate of material: JIS A1050 and quality: O. As shown in FIG. 1, the size of the plate 1 is a width W = 300 mm and a length L = 600 mm. The size of the aluminum alloy plate before the plastic working by press forming is a size obtained by adding a so-called blank holder portion around the plate material 1 shown in FIG. Moreover, although the thickness t of the aluminum alloy plate before plastic working is 0.4 mm, it slightly decreases after plastic working.
In this example, press forming using a pair of dies is used as an example of plastic working, but instead, a pair of forming rolls having a desired concavo-convex shape on the surface is passed through an aluminum alloy plate as a material. By adopting roll forming for plastic working, it is possible to give an uneven shape as shown in FIG.

  As shown in FIGS. 2 to 4, the concavo-convex portion 2 includes the first region 21, the second region 22, and the third region 23 as described above. As shown in FIGS. 3 and 4, when viewed from above, the first region 21 protrudes most in the thickness direction, then the second region 22 protrudes, and the third region 23 does not protrude. Yes. When viewed from the opposite side, the third region 23 protrudes most in the thickness direction, then the second region 22 protrudes, and the first region 21 does not protrude. In other words, the second region 22 is a neutral surface in the thickness direction, the first region 21 is a protruding surface, and the third region is a recessed surface. Conversely, it can be said that the second region 22 is a neutral surface in the thickness direction, the first region 21 is a recessed surface, and the third region is a protruding surface.

  In addition, as shown in FIG. 2, the arrangement of the regions in the concavo-convex portion 2 is regular. That is, the center points of the first region 21 correspond to the positions of the hexagonal center points a and the lattice points b constituting the virtual hexagonal lattice A and are regularly distributed around these points. Has been placed. Each first region 21 has a dodecagonal outer peripheral shape.

  As shown in the figure, the second regions 22 are dispersedly arranged so as to connect the adjacent first regions 21 to each other. Specifically, it is a rectangular region that connects both ends of two adjacent parallel sides of the adjacent first regions 21. The six second regions 22 are in contact with the first region 21.

  As shown in the figure, the third regions 23 are distributed in positions surrounded by the first region 21 and the second region 22. The third region 23 has a hexagonal shape, and each side is in contact with the first region 21 and the second region 22 alternately. The six third regions 23 are in contact with the first region 21.

  Further, as shown in FIG. 5, the dimensions of each region are as follows. In addition, the boundary line of each area | region shown in the figure has shown the center part of the thickness of a boundary part, and is equivalent to the dimension on a design. Actually, since the boundary portion has a thickness and the boundary portion is formed in a slanted or curved shape due to a molding problem, the visual outline moves slightly outside or inside. In each of the above drawings, because of problems in drawing, as shown above, the design dimensions are shown in a diagram. In addition, as for FIG. 3 which is a perspective view (the same applies to FIG. 11 described later), natural roundness such as corners cannot be expressed due to the problem of expression in the diagram, but in the actual plate 1 In addition, roundness due to press molding (plastic working) occurs in the corners and the like.

As shown in FIG. 5, the lengths of the dodecagon sides of the first region 21 are slightly different from each other. That is, a side 211 having a length L ₁₁ = 3.6 mm and a side 212 having a length L ₁₂ = 3.0 mm are alternately connected to form a dodecagon.
Further, the interval L ₁₃ between the sides 211 is 12.0 mm, and the interval L ₁₄ between the sides 212 is 12.3 mm.
The first region 21 is a substantially flat plane.
Further, as shown in FIG. 4, the protruding height D ₁ in the thickness direction of the first region 21 is set to 0.6 mm on the basis of the surface of the second region 22. Incidentally, the protrusion height D ₁ may be somewhat changed. An appropriate range of D ₁ depends on the thickness t of the metal plate before plastic working, and a range satisfying the relational expression of 0.5 ≦ t / D ₁ ≦ 2.0 is preferable. When the upper limit value of this range is exceeded, the effect of improving the rigidity is not obtained so much, and when the lower limit value is exceeded, plastic working may be difficult.

As shown in FIG. 5, the second region 22 has a rectangular shape by alternately connecting the side 212 common to the first region 21 and the side 221 having a length L ₂₁ = 5.0 mm. The side 212 is a boundary between the first region 21 and the second region 22.
The second region 22 is a substantially flat plane.

As shown in the figure, the hexagonal sides of the third region 23 are slightly different in length alternately. That is, the side 211 common to the first region 21 and the side 221 common to the second region 22 are alternately connected to form a hexagon. The side 211 is a boundary between the first region 21 and the third region 23, and the side 221 is a boundary between the second region 22 and the third region 23.
Further, the third region 23 is a substantially flat plane.
Further, as shown in FIG. 4, the protruding height D ₃ in the thickness direction of the third region 23 is set to 0.6 mm on the basis of the surface of the second region 22. Incidentally, the protrusion height D ₃ may be somewhat changed. An appropriate range of D ₃ depends on the thickness t of the metal plate before plastic working, and a range satisfying the relational expression of 0.5 ≦ t / D ₃ ≦ 2.0 is preferable. When the upper limit value of this range is exceeded, the effect of improving the rigidity is not obtained so much, and when the lower limit value is exceeded, plastic working may be difficult.

As described above, each region has the second region 22 as a neutral surface, and the first region 21 protrudes 0.6 mm on one side in the thickness direction, and the third region 23 protrudes 0.6 mm on the other side.
Further, the thickness of each part is slightly reduced by plastic working, and the entire flat part has a thickness t = 0.38 mm, and the boundary part is equal to or slightly thinner than the thickness of the flat part. In addition, the boundary portion is appropriately rounded at a corner portion corresponding to plastic processing.

  The concavo-convex portion 2 of the plate material 1 of the present example is configured based on the dimensional relationship as described above. In this example, all the first regions 21 have the same size and shape, all the second regions 22 have the same size and shape, and all the third regions 23 have the same size and shape. . However, it is not always necessary that all the regions belonging to the same region have the same shape and size. For example, the shape or size may be changed alternately. Further, although each region is a flat surface, the surface in the region may be raised.

In any case, as described above, the plate material 1 has three types of regions, ie, the first region 21, the second region 22, and the third region 23, which have different protrusion heights in the thickness direction, as the concavo-convex portion 2. . These are distributed in a distributed manner without continuously connecting the same type of regions. Further, each area is distributed and arranged so as to be in contact with other two different areas. By making such a configuration an essential requirement, it is possible to obtain an unprecedented rigidity improvement effect of the plate material.
The reason is considered as follows.

  As the concavo-convex portion 2, there are three types of protruding heights, none of the types are continuous, and each region is always in contact with two different types of regions. For example, the outer periphery of one first region 21 is always in contact with several second regions 22 and third regions 23. In other words, the outer periphery of each first region 21 is surrounded by the second region 22 and the third region 23. Similarly, the outer periphery of each second region 22 is surrounded by the first region 21 and the third region 23. In addition, the outer periphery of each third region 23 is surrounded by the first region 21 and the third region 23. In each region, the same type is distributed and arranged without being continuous.

  By making each region constituting the concavo-convex portion 2 distributed as described above, when the stress transmitted to one region is transmitted in the plane direction, the boundary portion between the outer peripheral portion and other different regions is always obtained. I have to go through. Here, the boundary part between different areas is a highly rigid part that changes in shape in the thickness direction. Therefore, it is thought that the rigidity improvement effect as a whole can be enhanced.

And the structure of said uneven | corrugated | grooved part 2 cannot be implement | achieved only by 2 types of protrusion height of the thickness direction differing, but can be implement | achieved only by making it 3 types positively.
In this example, the first region 21, the second region 22, and the third region 23 are regularly arranged as described above. As a result, the basic structure of the present invention can be easily realized, and a concavo-convex shape excellent in aesthetics can be obtained with a regular arrangement.

(Example 2)
In this example, a method for designing the shape of the concavo-convex portion 2 of the plate 1 of the first embodiment will be described.
First, as shown in FIG. 6, a reference triangle K is used as a unit shape.
The reference triangle K has a first vertex P ₁ , a second vertex P ₂ and a third vertex P _3, and a first side Q ₁ and a first vertex P ₁ connecting the second vertex P ₂ and the third vertex P _3. It has a second side Q ₂ connecting the third vertex P ₃ and a third side Q ₃ connecting the first vertex P ₁ and the second vertex P ₂ . First vertex P ₁ interior angle theta ₁ is 30 °, the second apex P ₂ interior angle theta ₂ is 90 °, the interior angle theta ₃ of the third vertex P ₃ is 60 °.
In this example, when the thickness of the plate material is t and the length of the first side Q ₁ in the reference triangle K is L, t / L = 0.08.

Next, inside the reference triangle K, the first reference region R ₁ including the first vertex P ₁ , the second reference region R ₂ including the second vertex P _2, and the third reference including the third vertex P _3. The area R ₃ is divided into _three areas. In this example, a first perpendicular line V ₁ , a second perpendicular line V _2, and a third perpendicular line that hang from the reference point V in the reference triangle K to the first side Q ₁ , the second side Q _2, and the third side Q ₃ , respectively. Each reference area is defined by V ₃ . In other words, the first vertical line V ₁ and the second reference region R ₂ third partitioned between reference region R _3, defined by the second perpendicular line V ₂ first reference region R ₁ and the third reference region R ₂ Then, the first reference region R ₁ and the second reference region R ₂ are partitioned by the third perpendicular line V ₃ .

In this example, if the length of the first side Q ₁ in the reference triangle K is L, the length of the third perpendicular V ₃ is X, and the length of the first perpendicular V ₁ is Y, X / L = 0.3 Y / L = 0.5.
Accordingly, when the area of the first reference region R ₁ is S1, the area of the second reference region R ₂ is S2, and the area of the third reference region R ₃ is S3, S1 / S3 = 1.28, S2 /S1=0.37, S2 / S3 = 0.48.

Next, as shown in FIG. 7, each side of the reference triangle K is inverted and transferred around the line symmetrical center to draw three reference triangles K ₂ . Further, as shown in FIG. 8, each side of each of the three reference triangles K ₂ is inverted and transferred around the line symmetrical center to draw a total of six reference triangles K ₃ . Further, as shown in FIG. 9, such reverse transfer is repeated. Then, each side of all reference triangles is deleted. Thus, the first reference region R ₁ is the first region 21, the second reference region R ₂ is the second region 22, and the third reference region R ₃ is the third region 23.
Such reverse transfer plotting can be easily performed by using CAD.

By the above procedure, the boundary shape of the three regions can be designed regularly.
Next, the protrusion height in the thickness direction of each region of the uneven portion 2 is determined. In this example, as shown in the first embodiment, the second region 22 is a neutral surface, and the first region 21 and the third region 23 are projected on both sides by 0.6 mm in opposite directions.

Next, based on the design shape of the said uneven part 2, the metal mold | die for forming the said uneven part 2 in the flat raw material which consists of aluminum alloy plates is prepared.
Next, the plate material 1 having the concavo-convex portion 2 is obtained by plastic working the material using the mold.

  As described above, in this example, by determining the reference triangle K, it is possible to easily design the concavo-convex portions 2 having a regular arrangement.

(Example 3)
The plate material 1 of Example 1 was evaluated for quantitatively determining its rigidity improvement effect.
First, as shown in FIG. 10, a strip-shaped plate material 8 made of the same material as that of Example 1 is an evaluation object. The size of each region was the same as in Example 1, and the thickness was also the same.
Then, how long the other end 81 bends was determined under the condition that one end 81 in the longitudinal direction of the plate 8 was fixed and a load F was applied to the other end 82 in the vertical direction of the plate 8. As a comparison, the amount of deflection was similarly determined for a flat plate having a thickness of 0.4 mm without unevenness. When the amount of bending of both was compared, the plate material 8 having the shape of the present invention of FIG. 10 was about 0.33 times the amount of bending of the flat plate. That is, the shape of Example 1 of the present invention has a result having about three times the rigidity.

  The influence of the directionality of the rigidity improvement effect was also examined. Specifically, the strip-shaped plate material 8 shown in FIG. 10 was prepared, and those having a longitudinal direction different by 15 ° and those different by 30 ° were prepared, and the same evaluation as above was performed. As a result, the obtained rigidity was equivalent to that shown in FIG. 10, and it was confirmed that the effect of improving the rigidity was about three times that in the case of the flat plate in any direction.

Example 4
This example is an example in which the protrusion height is changed in each region for the first region 21 and the third region 23 based on the shape of the uneven portion 2 of the first embodiment.
As shown in FIGS. 11 and 12, the first region 21 has a central portion C ₁ as a vertex, and has a shape that rises in a substantially conical shape so as to move away from the second region 22 as it approaches the vertex.
Further, the third region 23 has a central portion C ₂ as a vertex, and has a shape that rises in a substantially conical shape so as to move away from the second region 22 as it approaches the vertex.

FIG. 12 is a diagram showing the raised shape in an emphasized manner, and although it is not dimensionally accurate, the protrusion amount D ₁₅ = 0.5 mm in the region of the central portion C ₁ of the first region 21. The protrusion amount D ₃₅ in the region of the central portion C ₃ of the third region 21 is 0.5 mm. Other dimensional relationships are the same as in the first embodiment. Appropriate range of D ₁₅ is also affected by the thickness t of the plastic working before the metal plate, it is a range satisfying the relational expression D ₁₅ / t ≦ 5. As the upper limit of this range is approached, the rigidity improvement effect increases, but when the upper limit is exceeded, plastic working may become difficult. It should be noted that the lower limit value is in a flat state, and it is needless to say that the same effect as in Example 1 can be obtained. Appropriate range of D _35, nor affects the thickness t of the plastic working before the metal plate, as in the case of D _15, it is a range satisfying the relational expression D ₃₅ / t ≦ 5.

As described above, by changing the protrusion height in the first region 21 and the third region 23, the rigidity improvement effect can be further enhanced as compared with the case of the first embodiment. Specifically, when the plate material of this example was evaluated in the same manner as in Example 2, a result having a rigidity about 3.7 times the rigidity of the compared flat plate was obtained. It was also found that if the values of D ₁₅ and D ₃₅ were increased to near the upper limit, this magnification increased to nearly 5 times.
In other respects, the same effects as those of the first embodiment can be obtained.

(Example 5)
As shown in FIGS. 13 and 14, this example is based on the shape of the concavo-convex portion 2 of the first embodiment, and the first region 21 and the third region 23 have a protruding height in each region, as in the fourth embodiment. It is another form of the example which changed the height.
As shown in the figure, the first region 21 and the third region 23 of the present example are similar to the fourth embodiment in that the first region 21 and the third region 23 have a substantially conical shape so as to be separated from the second region 22 in opposite directions. However, this embodiment is different from the fourth embodiment in that the vicinity of the apex is the flat portions 217 and 237.

In this case, the same operational effects as those of the fourth embodiment can be obtained, and the flat surfaces 217 and 237 in the first region 21 and the third region 23 can be bonded to a separately prepared flat plate. Can be used effectively. Thereby, it is possible to easily obtain a structure having a sandwich structure in which a separately prepared flat plate and a plate material having the uneven portion of this example are laminated.
In other respects, the same effects as those of the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Board | plate material 2 Uneven part 21 1st area | region 22 2nd area | region 23 3rd area | region

Claims (19)

It is a plate material that has increased rigidity by forming uneven portions,
The concavo-convex portion is configured by combining a large number of three types of regions, a first region, a second region, and a third region, having different protrusion heights in the thickness direction.
The first region, the second region, and the third region are arranged in a distributed manner such that each region is always in contact with two different types of regions without continuously connecting the same type of regions,
The first regions are regularly distributed in correspondence with the center points of the hexagons constituting the virtual hexagonal lattice and the positions of the lattice points.
The second regions are arranged in a distributed manner so as to connect the adjacent first regions,
The board | plate material which has an uneven | corrugated | grooved part characterized by the said 3rd area | region being distributed and arrange | positioned in the position enclosed by the said 1st area | region and the said 2nd area | region.   2. The plate material having an uneven portion according to claim 1, wherein at least one of the first region, the second region, and the third region has a protruding height that changes in the region. In Claim 1 or 2, the uneven part uses a reference triangle as a unit shape,
The reference triangle has a first vertex, a second vertex and a third vertex and a first side connecting the second vertex and the third vertex, a second side connecting the first vertex and the third vertex; and It has a third side connecting the first vertex and the second vertex, the interior angle of the first vertex is 30 °, the interior angle of the second vertex is 90 °, and the interior angle of the third vertex is 60 ° Shall be
The inside of the reference triangle is partitioned into three parts: a first reference region including the first vertex, a second reference region including the second vertex, and a third reference region including the third vertex,
Each of the sides of the reference triangle is inverted and transferred around it as a center of line symmetry, and each of the sides of each of the inverted reference triangles is inverted and transferred around it as a center of line symmetry. The uneven portion is designed by designating a group of areas as the first area, a group of the second reference areas as the second area, and a group of the third reference areas as the third area. A plate material having   4. The plate having an uneven portion according to claim 3, wherein the plate is formed by forming the uneven portion by plastic working a metal plate. In claim 4, the thickness t of the metal plate before plastic working and the length L of the first side in the reference triangle are:
t / L ≦ 0.2,
The board | plate material which has an uneven | corrugated | grooved part characterized by having these relationships. In claim 4 or 5, in the reference triangle, the area S1 of the first reference region and the area S3 of the third reference region are:
0.4 ≦ S1 / S3 ≦ 5.9,
The board | plate material which has an uneven | corrugated | grooved part characterized by having these relationships. In claim 6, in the reference triangle, the area S1 of the first reference region, the area S2 of the second reference region, and the area S3 of the third reference region are:
0.02 ≦ S2 / S1 ≦ 1.0,
0.4 ≦ S2 / S3 ≦ 1.0,
The board | plate material which has an uneven | corrugated | grooved part characterized by having these relationships.   The reference triangle according to any one of claims 3 to 7, wherein the reference triangle includes a first perpendicular line, a second perpendicular line, and a second perpendicular line respectively hanging from the reference point therein to the first side, the second side, and the third side. 3 perpendicular lines between the second reference area and the third reference area, between the first reference area and the third reference area, and between the first reference area and the second reference area, respectively. The board | plate material which has an uneven | corrugated | grooved part characterized by being partitioned. In Claim 8, the length L of the first side in the reference triangle, the length X of the third perpendicular, and the thickness t of the metal plate before plastic working are:
0.1 ≦ X / L ≦ 0.4,
X> t,
The board | plate material which has an uneven | corrugated | grooved part characterized by having these relationships. In Claim 8 or 9, the length L of the first side in the reference triangle, the length Y of the first perpendicular, and the thickness t of the metal plate before plastic working,
0.1 ≦ Y / L ≦ 0.8,
Y> t,
The board | plate material which has an uneven | corrugated | grooved part characterized by having these relationships.   11. The plate material having uneven portions according to claim 1, wherein the plate material is an aluminum alloy plate made of aluminum or an alloy thereof. A method of designing the shape of the concavo-convex portion in the plate material having the concavo-convex portion according to claim 1 or 2,
Using a reference triangle as the unit shape,
The reference triangle has a first vertex, a second vertex and a third vertex and a first side connecting the second vertex and the third vertex, a second side connecting the first vertex and the third vertex; and It has a third side connecting the first vertex and the second vertex, the interior angle of the first vertex is 30 °, the interior angle of the second vertex is 90 °, and the interior angle of the third vertex is 60 ° Shall be
The inside of the reference triangle is partitioned into three parts: a first reference region including the first vertex, a second reference region including the second vertex, and a third reference region including the third vertex,
Each of the sides of the reference triangle is inverted and transferred around it as a center of line symmetry, and each of the sides of each of the inverted reference triangles is inverted and transferred around it as a center of line symmetry. The shape of the concavo-convex portion in the plate material having the concavo-convex portion, wherein the group of regions is the first region, the group of the second reference regions is the second region, and the group of the third reference regions is the third region. Design method.   13. The method for designing an uneven portion shape according to claim 12, wherein the plate member is obtained by forming the uneven portion by plastic working a metal plate. In claim 13, the thickness t of the metal plate before plastic working and the length L of the first side in the reference triangle are:
t / L ≦ 0.2,
A method for designing an uneven portion shape, characterized in that In Claim 13 or 14, in the reference triangle, the area S1 of the first reference region and the area S3 of the third reference region are:
0.4 ≦ S1 / S3 ≦ 5.9,
A method for designing an uneven portion shape, characterized in that In Claim 15, in the reference triangle, the area S1 of the first reference region, the area S2 of the second reference region, and the area S3 of the third reference region are:
0.02 ≦ S2 / S1 ≦ 1.0,
0.4 ≦ S2 / S3 ≦ 1.0,
A method for designing an uneven portion shape, characterized in that   17. The reference triangle according to claim 12, wherein the reference triangle includes a first perpendicular, a second perpendicular, and a second perpendicular to the first side, the second side, and the third side, respectively, from a reference point therein. 3 perpendicular lines between the second reference area and the third reference area, between the first reference area and the third reference area, and between the first reference area and the second reference area, respectively. A method for designing a concavo-convex part shape, characterized in that the section is partitioned. In Claim 17, the length L of the first side in the reference triangle, the length X of the third perpendicular, and the thickness t of the metal plate before plastic working are:
0.1 ≦ X / L ≦ 0.4,
X> t,
A method for designing an uneven portion shape, characterized in that In Claim 17 or 18, the length L of the first side in the reference triangle, the length Y of the first perpendicular, and the thickness t of the metal plate before plastic working,
0.1 ≦ Y / L ≦ 0.8,
Y> t,
A method for designing an uneven portion shape, characterized in that

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