JP2001018842A - Reinforcing plate for panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a weight while keeping the tensile rigidity by forming radial openings from a projection-shaped apex. SOLUTION: A number of projetions 2 projecting in the same direction are regularly and uniformly arranged on a reinforcing plate for panel, made of aluminium alloy. For example, four openings 3a, 3b, 3c, 3d of equal size are radially formed on a side face of the projection 2 symmetrically with respect to an apex 4. By applying the reinforcement plate 1 for panel having this structure, the tensile rigidity is not uniformly borne by the whole side face of the projections 2 but by several parts radially extended from the apexes 4 of the projections 2 and existing at random. That is, the magnitude of the tensile rigidity of the projecting parts 2 hardly reduces even when the tensile rigidity is borne only by the supporting parts 5a-5d by forming the radial openings 3a-3d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing plate for a panel, for example, a reinforcing plate for a panel called an inner panel for reinforcing an outer panel of an automobile.

[0002]

2. Description of the Related Art In recent years, it has been used for outer panels and structural materials or parts of transport vehicles such as automobiles, ships, and trains, or for structural materials or parts of home electric appliances, and for members of architectural structures such as roofing materials. From the viewpoint of weight reduction, use of an aluminum (Al) alloy is expected. When such an aluminum alloy is used as a panel, it is desirable to reduce its thickness as much as possible in order to reduce the weight.
However, simply forming the panel thinner,
The panel section cannot be given a certain overall rigidity. Therefore, it has been considered to attach a reinforcing plate made of an aluminum alloy, in which a large number of protrusions called "cones" are press-formed, to the panel.

FIG. 3 shows an example of such a reinforcing plate. The Al alloy reinforcing plate 100 depicted in FIG. 3 is an Al alloy outer panel (outer plate) 1 of a trunk lid of an automobile 101.
02 is attached as an inner panel (inner plate). The reinforcing plate 100 includes an outer panel 102.
Frustoconical portion 104 protruding at an inclination angle of about 20 ° in the direction of
Are provided by press molding in large numbers. The reinforcing plate 100 having a large number of such truncated cone portions 104 has a greater bending rigidity than a simple flat plate. Outer panel 1
02 and the reinforcing plate 100 are connected to each other not only at the edge of the reinforcing plate 100 but also at the top of the truncated cone 104 via an adhesive such as resin. Therefore, by using the reinforcing plate 100, the outer panel 102 and the reinforcing plate 100
The overall rigidity of the trunk lid can be maintained at a certain level or more while reducing the weight of the trunk lid. Further, by using the reinforcing plate 100, effects such as sound insulation and vibration suppression are expected.

[0004]

As an index of the strength of a reinforcing plate structure in which a reinforcing plate having such projections and a panel are bonded together, there is tensile rigidity. The tension stiffness is a stiffness against a localized concentrated load acting (for example, when pressed with a finger) perpendicular to the projecting side surface of the projection of the reinforcing plate, and is orthogonal to the thickness direction of the reinforcing plate. Local stiffness in the direction of In other words, the reinforcing plate structure composed of the reinforcing plate and the panel needs to have a tensile rigidity that is equal to or higher than a certain value required according to its use. Therefore, the reinforcing plate needs to be designed so that the deformation of the reinforcing plate structure falls within a certain value under a load condition for the tensile rigidity. On the other hand, from the viewpoint of reducing the weight of the reinforcing plate structure, it is preferable to avoid excessively increasing the tensile rigidity.

However, with respect to the reinforcing plate 100 having a large number of truncated cones 104 as shown in FIG. 3, it is possible to maintain a certain level of rigidity while realizing the weight reduction of the reinforcing plate structure. Little research has been done at present. In other words, the problem of how to optimize the shape of the projection from the viewpoint of reducing the weight while maintaining the tensile rigidity remains unsolved.

SUMMARY OF THE INVENTION It is an object of the present invention to optimize the shape of a projection of an Al alloy reinforcement plate having a plurality of projections, thereby obtaining a lightweight and relatively large panel rigidity. It is to provide.

[0007]

Means for Solving the Problems As a result of research conducted to achieve the above-mentioned object, the present inventor has found that, in an aluminum alloy panel reinforcing plate having a plurality of projections, the tensile rigidity of the aluminum alloy panel reinforcement is less than that of the projections. It has been found that, instead of being uniformly carried by the side surfaces, most of them are carried by a plurality of portions that are scattered and extend radially from the center (top) of the side surface.

Based on this finding, the present inventor has conceived a panel reinforcing plate having openings formed radially from the tops of the projections (claim 1). In other words, by leaving only the minimum necessary parts for supporting the tensile rigidity on the side surfaces of the protrusions and removing the other parts to form a radial opening, the tensile rigidity is hardly degraded even more than before. It is also possible to obtain a lightweight panel reinforcing plate. Conversely, if the thickness of the panel reinforcing plate is increased by the amount removed to provide the opening, it is possible to obtain a panel reinforcing plate having high tension and rigidity with the same weight as before.

In the present invention, it is preferable that the projection has a circular or regular polygonal plane shape and does not extend in a specific direction, but is not particularly limited to this. Specific shapes of the protrusions include, for example, those having a trapezoidal cross section such as a truncated cone or a truncated pyramid, those having a triangular cross section such as a cone or a pyramid, and those having an arcuate cross section such as a hemisphere. Alternatively, the shape may be different for each of the plurality of protrusions. Further, the plurality of projections may be regularly arranged in the main surface (usually, a flat surface provided between the plurality of projections) of the panel reinforcing plate, or may be irregularly arranged. It does not matter.
Further, the plurality of protrusions may have different plane areas or the same plane area for each protrusion. However, from the viewpoint of improving the overall rigidity, it is preferable that a plurality of protrusions are regularly arranged in the main surface of the panel reinforcing plate, and that each has the same shape and the same plane area. In addition, the protrusion may be formed by press molding or may be formed by another processing method such as roll processing.

In the present invention, the opening is preferably provided symmetrically with respect to the top of the projection. Because the openings are provided symmetrically with respect to the tops of the protrusions, the portions that bear the tensile rigidity are also provided symmetrically with respect to the tops, and only some of the portions may bear the excessive tensile rigidity. This is because, as a result, deterioration of the tensile rigidity can be suppressed as a result. Here, the “symmetry” may be either line symmetry with respect to a straight line passing through the apex or point symmetry with respect to the center point of the apex. Point symmetry is preferred.

The aluminum alloy plate used in the present invention can be made of 1000 series, 3000 series, 5000 series, or 6000 series according to AA or JIS standards according to the required characteristics.
An aluminum alloy such as a system is appropriately selected and used. For example, as in the examples described below, from the viewpoint of recycling characteristics and cost, 30 AA or JIS standards are used.
A 3004 aluminum alloy which is one of the 00 series aluminum alloy (hereinafter, simply referred to as “3000 series aluminum alloy”) may be used.

[0012] 3004 aluminum alloy has a great cost advantage by mass production, and is considerably cheaper than, for example, 5000 series aluminum alloy. The 3004 aluminum alloy is generally lower in strength than the 5000-series alloy, but is advantageous in cost in terms of plate production because the addition amount of Mg is about 1% and the rollability is good. Therefore,
3004 aluminum alloy is a material suitable for use as a panel reinforcing plate.

A 3004 aluminum alloy as an example of a 3000 series aluminum alloy is basically composed of 0.8% Mg.
1.3% by weight, Mn 1.0-1.5% by weight, Si 0.3% by weight, Fe 0.7% by weight, Cu 0.25% by weight, Zn 0.25% by weight , The remainder Al and inevitable impurities. However, even if the components do not always meet the specifications, the composition of the components can be appropriately changed.
That is, it is permissible to change the component range of the above-mentioned elements and appropriately include other elements according to more specific applications and required characteristics.

[0014] 3004 aluminum alloy, tensile strength of 180 N / mm ^2, yield strength is 80 N / mm ^2, has a mechanical property that is 25% elongation, also good corrosion resistance. 3004 aluminum alloy is 500
Like the 0-type or 6000-type alloys, they are classified as corrosion-resistant aluminum alloys, and are aluminum alloys in which various properties such as corrosion resistance, strength, and formability are balanced. In the present invention, in addition to the 3000 series aluminum alloy, 50
It is also possible to use a 00 series or 6000 series aluminum alloy.

The panel reinforcing plate of the present invention can be manufactured, for example, by pressing a plate material so as to form a projection and then punching an opening.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic perspective view of a panel reinforcing plate according to the present embodiment. The panel reinforcing plate 1 shown in FIG. 1 is made of a 3004 aluminum alloy, and a large number of projections 2 projecting in the same direction are regularly and uniformly arranged. A flat portion 6 is provided between the protrusions 2. Each of the protrusions 2 has the same plane area as each other, and is arranged such that the center of the top is the position of the vertex of the equilateral triangle.

FIGS. 2 (a) and 2 (b) are enlarged schematic views of the projections 2 provided on the panel reinforcing plate 1 shown in FIG. 1, and FIG. 2 (a) is a plan view. FIG.
FIG. 2A is a cross-sectional view taken along line IIB-IIB. As is clear from these figures, the projection 2 has a generally truncated cone shape, and a horizontal circular top 4 is provided at the center. In addition, four openings 3a, 3b, 3c, 3d of the same size are radially formed on the side surface of the projection 2 and are symmetric with respect to the top 4 (here, point symmetry with respect to the center point of the top 4). It is provided in. The openings 3a to 3d are provided in a substantially sector shape so that the opening angle θ with respect to the center of the protrusion 2 is 90 °. From the top 4 of the projection 2, four support portions 5 connecting the top 4 and the periphery of the projection 2 are provided.
a, 5b, 5c, 5d are provided radially so as to form a cross between the openings 3a to 3d and symmetrically with respect to the top 4.

According to the panel reinforcing plate 1 of the present embodiment configured as described above, the supporting portions 5a to 5d bear the tensile rigidity due to the load applied to the top portion 4. Is almost the same as the case where the openings 3a to 3d are not present. In other words, the tensile rigidity is not uniformly carried by the entire side surface of the projection 2,
Actually, it is only carried by some parts which are scattered and extend radially from the top part 4 of the projection part 2,
Therefore, even if the radial openings 3a to 3d are provided and only the supporting portions 5a to 5d are provided with the tensile rigidity, the magnitude of the tensile rigidity of the projection 2 hardly decreases.

Moreover, in the present embodiment, the openings 3a to 3a
3 d is provided symmetrically with respect to the top 4 of the projection 2, so that the supporting portions 5 a to 5 d are also provided symmetrically with respect to the top 4. As a result, the tension stiffness is equally distributed by the four support portions 5a to 5d, and only some of the portions do not excessively bear the tension stiffness. As a result, the tension stiffness of the panel reinforcing plate 1 is reduced. Deterioration can be suppressed small.

Further, according to the panel reinforcing plate 1 of the present embodiment, the flat portion 6 between the projections 2 of the panel reinforcing plate 1 is provided.
Has the same shape as the existing reinforcing plate for a panel having a projection, and the overall rigidity of the reinforcing plate structure using the reinforcing plate for a panel 1 can be substantially reduced by providing the openings 3a to 3d. Absent.

Therefore, the panel reinforcing plate 1 according to the present embodiment.
With the provision of the openings 3a to 3d, the tension rigidity is maintained at a certain level or more without substantially deteriorating, and the weight is reduced by the provision of the openings 3a to 3d.

In this embodiment, the openings 3a to 3d
Has a substantially sector shape with an opening angle of 90 °, but the shape of the openings 3a to 3d is not particularly limited as long as the openings 3a to 3d are provided radially from the top 4 of the projection 2. θ can be appropriately changed. Furthermore, the number of openings is not limited to four, and may be increased or decreased as appropriate. Further, in the present embodiment, the openings 3 a to 3 d correspond to the top 4 of the projection 2.
However, the openings 3 a to 3 d may be provided asymmetrically with respect to the top 4 of the projection 2.

In the present embodiment, the thickness of the panel reinforcing plate 1 is not changed, but if the thickness is increased by the weight of the openings 3a to 3d, the advantage of weight reduction can be obtained. Although not provided, it is possible to improve the tension rigidity.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various design changes can be made in terms of the form of the panel reinforcing plate and the like. . In the above-described embodiment, the panel reinforcing plate having a specific form in terms of the shape and arrangement of the projections has been described. However, the above results are similarly obtained even when the shape and arrangement of the projections are changed. That has been confirmed.

[0026]

As described above, according to the first aspect, it is possible to obtain a lightweight panel reinforcing plate without substantially deteriorating the tensile rigidity. Therefore, by attaching the inner panel to an outer panel for a transporting machine such as an automobile, it is possible to reduce the weight while maintaining the tensile rigidity.

According to the second aspect, since the opening is provided symmetrically with respect to the top of the projection, the deterioration of the tensile rigidity can be suppressed to a small extent.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a panel reinforcing plate according to an embodiment of the present invention.

FIG. 2 is a plan view and a cross-sectional view of a protrusion provided on the panel reinforcing plate shown in FIG.

FIG. 3 is a diagram showing a state of use of a conventional panel reinforcing plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Panel reinforcing plate 2 Projection part 3a, 3b, 3c, 3d Opening part 4 Top part 5a, 5b, 5c, 5d Supporting part 6 Flat part

Claims (2)

[Claims] 1. A panel reinforcing plate made of an aluminum alloy having a plurality of projections, wherein an opening is provided radially from a top of the projection. 2. The panel reinforcing plate according to claim 1, wherein the opening is provided symmetrically with respect to the top.