JP2000264069A - Shade panel for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight, and to improve the strength of a shade panel such as an indoor shade panel of a sunroof for an automobile by manufacturing two aluminum sheets in an integratedly laminating manner by a caulking or brazing method. SOLUTION: This shade panel 1 for an automobile has the two-dimensional or three-dimensional curvature to meet a curved surface of a ceiling part of the automobile in which the panel 1 is installed, an upper plate 3 is laminated on a lower plate 2 in a center portion, and these upper and lower plates 2, 3 are integrated by a caulking or brazing method to form a composite plate. A knob hole 4 to pull out the panel 1 is provided in an upper center. In the figure, ○ denotes a part to be caulked or brazed. For example, when the sheets are integrated by caulking, a projecting part 5 to be used in the caulking method is provided on the lower plate 2, and a hole 6 corresponding to the projecting part 5 is provided in the upper plate 3, the upper and lower plates 2, 3 overlap by fitting the projecting part 5 to the hole 6, and a top portion of the projecting part projected from the hole 6 is squeezed by a press to form a caulked portion 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding panel for automobiles, and more particularly, to a light-shielding panel for automobiles in which two thin aluminum plates are integrally laminated by a caulking method or a brazing method to reduce the weight and improve the strength. Pertaining to the panel.

[0002]

2. Description of the Related Art Heretofore, it has been necessary to use a bent panel having a large radius of curvature for an indoor light-shielding panel of a sunroof for an automobile. was there. Therefore, these bent panels with a large radius of curvature are: (a) those that have been subjected to required molding using plastic; (b) those in which an aluminum plate and a reinforcing material are joined by spot welding; (c) the roll bonding method. There was a product using a molded product expanded by using the method described above, and each product had advantages and disadvantages.

In general, a light shielding panel for an automobile has a two-dimensional or three-dimensional curvature which is substantially the same as that of a ceiling of an automobile. It is required to have a high strength. From this point, the thickness of the conventional plastic product is about 4 to 5 mm, which is the limit of its thickness, and there is a problem with respect to recycling in the future, and there is a difficulty in odor and weight. For spot welded products, we are making reinforcing materials and adapting the plate to the mold to make the entire mold,
There is a problem that there is a difficulty in forming dimensions due to processing strain, the appearance of the spot weld is poor, and the height of the reinforcing material cannot be made lower than 3 to 5 mm. Roll bond molded products have been proposed as a solution to these problems.
Only when it was thinned to 8 mm, it became the same weight as the conventional product, and it could not meet the demand for weight reduction, and there were limits to cost reduction due to the need for multiple steps of manufacturing.

[0004]

SUMMARY OF THE INVENTION The present invention satisfies the following requirements for a light-shielding panel for automobiles: a) light, b) easy to recycle, c) satisfactory functions, and d) inexpensive. An object of the present invention is to provide a satisfactory automotive light-shielding panel.

[0005]

That is, an automobile light-shielding panel according to the present invention is an automobile in which two aluminum thin plates are integrally laminated by a caulking method or a brazing method so as to reduce the weight and improve the strength. It is a light shielding panel.

[0006]

FIG. 1 shows an embodiment of a light shielding panel for an automobile according to the present invention. The automotive light-shielding panel 1 has a two-dimensional or three-dimensional curvature that matches the curved surface of the vehicle ceiling where the panel is installed. An upper plate 3 is laminated on a lower plate 2 at the center of the panel 1, and the upper and lower plates 2, 3 are formed as a composite plate integrated by caulking or brazing. In the upper center of FIG. 1, a knob hole 4 for pulling out the panel 1 is provided. In FIG. 1, the symbol “〇” indicates a place where caulking or brazing is performed.

FIG. 2 is a sectional view taken along the line AA of FIG. 1, wherein (a) shows a state before crimping and (b) shows a state after crimping. The lower plate 2 is provided with a convex portion 5 used for the caulking method, the upper plate 3 is provided with a hole 6 corresponding to the lower plate convex portion 5, and the lower plate convex portion 5 is provided with a hole 6 of the upper plate 3. By fitting, the upper and lower plates are overlapped, and then a top portion of the convex portion 5 protruding from the hole 6 of the upper plate 3 is crushed by a press to form a caulking portion 7, that is, a so-called caulking method. The head diameter d of the convex portion 5 of the lower plate 2 is 2 mm or more.
It is preferably about 7 mm. If the value of d is too large, crushing by pressing cannot be performed sufficiently, and if it is too small, the strength will be weak. The bottom diameter D of the projection 5 is 2.1 mm to 7.2 mm.
The difference (D-d) between the bottom diameter D and the top diameter d is determined by the molding accuracy of the lower plate 2. However, if the difference is too large, the upper and lower plates are misaligned. 0.05 ~
It is desirable to set it to about 0.1 mm. However, since there are a large number of holes, it is desired to form them with high dimensional accuracy so that the upper and lower plates are entirely fitted. In this case, the value of D−d is 0.3 mm
Is required. When the upper and lower plates 2 and 3 are laminated by the caulking method, the upper plate 3 is overlapped with the lower plate 2 and then pressed and fixed. Therefore, the height of the convex portion is slightly higher than the thickness of the upper plate 3. It is necessary to protrude partially upward. There is no problem if the number of the convex portions 5 is 9 or more in the entire panel. The larger the number, the higher the strength is, but the productivity becomes a problem. FIG.
In the embodiment shown in FIG. 1, an example in which nine locations are provided is shown. The overall size of the panel is 300 to 1000 mm in width and 600 to 1000 mm in length
It is.

FIG. 3 is a partial cross-sectional view taken along the line BB of FIG. 1, and is a partial schematic view when the upper and lower plates 2, 3 are joined by a brazing method. In this example, as in the case of FIG. 2, a convex portion 5 is provided on the lower plate 2, the upper plate 3 having a hole 6 corresponding to the convex portion 5 is overlapped, and the hole 6 of the upper plate 3 is A brazing material 8 is brazed around the convex portion 5. In the example shown in FIG. 3, a case in which a corrugate is formed in advance as the upper plate 3 is used. In this case, the lower plate convex portion 5 similar to FIG.
The reason why the upper and lower plate holes 6 are formed is used solely for positioning the upper and lower plates. The dimensions of the corrugate are such that the rib width is 10 to 50 mm at the peaks and valleys, and at most 100 mm or less. The lower the height, the better, and preferably 3 mm or less, and practically 2 to 3 mm. FIG. 4 shows another example in which the brazing method is applied, wherein (a) shows a state before brazing and (b) shows a state after brazing. In FIG. 4, a brazing sheet 9 is arranged at an appropriate position between the upper and lower plates 2 and 3, and the upper and lower plates are joined by spot heating.
The brazing sheet 9 used in this case is preferably a mixture of brazing material and flux. When the upper and lower plates are joined by using the brazing method as shown in FIGS. 3 and 4, it is preferable that the number of joints is about nine in the entire panel 1. This is because if the number of joints increases, the degree to which the panel is heated as a whole increases, and the panel is likely to be annealed, which may cause a decrease in strength.

As the aluminum used for the panel 1 of the present invention, various aluminum alloys including pure aluminum can be used.
Any of 00 series, 5000 series, 6000 series, etc. can be used. When the brazing method is applied, spot heating may be either torch heating or electric heater heating, and it is preferable to perform torch heating in the air and electric heating in a vacuum or nitrogen. When using a high-strength heat-treated alloy as the aluminum alloy material and using a material that can be hardened in a later step, brazing is performed by stacking multiple panels at the same time and set in a furnace, and vacuum brazing or a nitrogen atmosphere is used. It may be performed by brazing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given of an embodiment of the present invention in which a light-shielding panel for an automobile as shown in FIG. 1 is formed by using a laminated plate having a laminated plate thickness of 0.5 mm obtained by laminating two A6951 aluminum plates having a thickness of 0.25 mm. The lower plate 2 is pressed into a curved surface having a radius of curvature of 8000R in the left-right direction of FIG. 1 and a curved surface having a radius of curvature of 1400R in the up-down direction in FIG. 1, and a knob portion 4 is formed in the upper central portion thereof. I have. On the panel surface of the lower plate 2, a corrugate is formed in advance at the center except for 20 mm on the upper portion, 30 mm on the lower portion, and 20 mm on the left and right, and the upper plate 3 having the same curved surface as the lower plate 2 is overlapped. Have been. The corrugate formed on the upper plate 3 had a peak length of 20 mm, a valley length of 30 mm, and a height of 1 mm. The upper and lower plates are overlapped with each other at a predetermined portion of the corrugated valley portion 10 by the entire panel.
The so-called caulking, in which a hole 6 drilled at a location and a protrusion 5 provided on the lower plate 2 at a position corresponding to the hole 6 are fitted, and the top of the protrusion protruding slightly from the hole 6 of the upper plate 3 is crushed by pressing. Law and upper plate 3
And a brazing method using a ring brazing material 8 around the protruding portion of the lower plate 2, and the panel of the present invention has a width of 700 mm as a panel according to the caulking method and a product according to the brazing method.
An automotive light-shielding panel having a height of 500 mm was obtained.

As a comparative example, a comparative example in which a plastic panel having a thickness of 4 to 5 mm and a roll bond panel having a thickness of 0.8 mm were formed in the same shape as the example of the present invention was prepared.

The intensity of the light-shielding panel 1 for an automobile was measured in the vicinity of the knob portion 4 in FIG. 1 (point S in the drawing) and in the center of the panel (point T in the drawing). In the strength measurement, the right and left ends of each panel were placed on a support table, a load was applied to points S and T with a push-pull gauge, and the bending immediately below the load was measured with a dial gauge. Table 1 shows the results.

[0013]

[Table 1]

From Table 1, it can be seen that the crimped product and the brazed product of the present invention have almost the same strength as the conventional plastic product or the roll-bonded product. 4 to 5 mm, and the thickness of the roll bond panel product is 0.8 mm, while it has a thickness of 0.5 mm, which is practically easy to install on the ceiling of a car as a light shielding panel for a car. It turns out that it is realized as satisfying. In the above description, a composite plate obtained by laminating two thin plates by a caulking method or a brazing method is described as being applied exclusively to a light shielding panel for an automobile. It can be preferably applied when light weight and thinning are required and at the same time moderate strength is required.

[0015]

As described above, according to the present invention, two aluminum thin plates are reduced in weight and thickness while maintaining substantially the same strength as the conventional product by extremely simple means such as caulking or brazing. Thus, an automotive light-shielding panel can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an automotive light-shielding panel according to the present invention.

FIGS. 2A and 2B are partial cross-sectional explanatory views taken along the line AA in FIG. 1, wherein FIG. 2A shows a state before caulking, and FIG. 2B shows a state after caulking.

FIG. 3 is a partial explanatory view taken along line AA in FIG. 1;
The case where the automotive light-shielding panel according to the present invention is formed by lamination by a brazing method will be described.

FIGS. 4A and 4B are partial explanatory views of an upper and lower plate in another case where the light-shielding panel for an automobile according to the present invention is laminated by a brazing method, wherein FIG. 4A is a state before brazing, and FIG. This shows the state after brazing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shading panel for automobiles 2 Lower plate 3 Upper plate 4 Knob hole 5 Convex part 6 Hole 7 Caulking part 8 Brazing material 9 Brazing sheet 10 Corrugated valley

Claims (3)

[Claims] 1. A light-shielding panel for an automobile, wherein two thin aluminum plates are integrally laminated by a caulking method to reduce the weight and improve the strength. 2. A light-shielding panel for an automobile, wherein two thin aluminum plates are integrally laminated by a brazing method to reduce weight and improve strength. 3. The light shielding panel for an automobile according to claim 2, wherein the brazing is performed by local heating means.