JP2963148B2 - Aluminum and aluminum alloy composite plate for press forming - Google Patents

Description

The present invention relates to the use of composite materials made of aluminum and aluminum alloys, and particularly to engine parts and interior parts of automobiles,
The present invention relates to an aluminum composite plate for press forming, which is suitable for materials requiring soundproofing and vibration-proofing functions in vehicle parts, electric products, and the like. In this case, the aluminum or aluminum alloy plate is simply referred to as “aluminum plate”.

(Prior Art) In recent years, damping steel sheets have been used for outer plates of electric washing machines and oil pans of automobiles for the purpose of soundproofing and vibration proofing. Wood is also being used.

The latter aluminum damping material has a resin layer between aluminum plates, and is characterized by light weight (1/3 of steel plate) and good corrosion resistance. Depending on the application, the material (1050, 5052, etc.) ), Board thickness (0.3mm / 0.3mm ~ 2.0mm / 2.0m)
m) has been selected.

For the resin layer, a thin viscoelastic polymer resin having a thickness of several tens of μm, for example, a thermoplastic resin such as a polymer based on polyethylene is used.

(Problems to be Solved by the Invention) At present, aluminum damping materials are of the same aluminum type (for example, A5052P-H32, A5182P-0, A1050).
P-H24, etc.) and the same thickness for the outer and inner plates, but the press formability, especially drawability, is inferior to aluminum and aluminum alloy veneers, making it difficult to commercialize. is there.

In other words, taking automobile parts as an example, recent automobiles are required to have excellent maneuverability, lightness, low fuel consumption, etc., and weight reduction of body weight and quietness in the room are becoming major themes. In the case where a part of a part made of a conventional steel plate is to be aluminized, the aluminum material is used only for limited applications (for example, an alternator cover) because the press formability of the aluminum material is lower than that of the steel plate. .

Similarly, oil pans and the like have recently used a damping steel plate to provide a soundproofing effect. However, even when an aluminum damping plate is used for the purpose of both lightening and soundproofing, the press formability is reduced. The cracks occurred due to poor quality, and the product was not commercialized.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide an aluminum composite plate excellent in press formability.

(Means for Solving the Problems) In order to solve the above-mentioned problems, for example, instead of using A5052-0 1.2 mm thick aluminum veneer products, the inventors of the present invention have specified specifications of the same aluminum type and the same plate thickness. That is, {5052-0 material / 5052-0 material: plate thickness 0.6 mm / 0.6 mm)} was experimentally manufactured, and when this was press-molded, cracks occurred and the product could not be commercialized.

Therefore, tests were conducted with various combinations of aluminum materials. As a result, it was found that only appropriate combinations of materials and plate thicknesses could be commercialized, and the present invention was made here.

That is, the present invention is a composite plate for press forming having a resin layer between two aluminum and aluminum alloy plates, and a material having a higher strength than an inner aluminum plate is used for an outer aluminum plate during press forming. The present invention provides a press-formed composite plate made of aluminum and an aluminum alloy, wherein the thickness of the outer aluminum plate is equal to or greater than the thickness of the inner aluminum plate.

 Hereinafter, the present invention is described in more detail.

(Operation) In general, as shown in FIG.
It has a resin layer between two metal materials.

Usually, as the metal material, a steel plate, a stainless steel plate, an aluminum plate, a titanium plate, or the like is used. Here, the thickness of the metal material is usually about 0.2 to 2.0 mm. On the other hand, for the resin layer, an extremely thin viscoelastic polymer resin having a thickness of several tens μm, for example, a thermoplastic resin such as a polyethylene-based polymer is used.

In the present invention, an aluminum or aluminum alloy plate is used as the metal material, but a material having a higher strength (tensile strength) than the inner aluminum plate is used for the outer aluminum plate during press molding. .

That is, when the strengths of the outer and inner aluminum plates are relatively viewed, a high-strength material is used on the outside and a low-strength material is used on the inside. For example, in the case of an alternator cover for an automobile, # 5052-0 material / 1050-0 material: plate thickness 0.8 mm
Material combinations such as (outside) /0.4 mm (inside) are given.

However, even if high-strength or low-strength materials are used for both the outside and the inside, or if low-strength materials are used for the outside and high-strength materials are used for the inside, cracks occur during press forming, and press forming Poor nature.

Further, in the present invention, the thickness of the aluminum or aluminum alloy plate needs to be equal to or greater than the thickness of the inner aluminum plate under the combination of the above materials. Even with the combination of the above materials, if the sheet thickness condition is not satisfied, the occurrence of cracks during press forming cannot be prevented.

In addition, as the resin layer, a thickness of several tens μm which is usually used.
However, it is needless to say that the thermoplastic resin such as a very thin viscoelastic polymer resin such as a polyethylene-based polymer may be used.

 Next, examples of the present invention will be described.

(Example) Assuming automobile parts, punch outer diameter 100φ, drawing depth 4
A 0 mm die was manufactured, and press forming tests of various composite materials were performed.

As shown in Table 1, four types of aluminum or aluminum alloy plates were prepared as aluminum plates in the composite plate. In the table, material B is an Al-Mn-Mg deep drawing alloy, and material D is an Al-Mg-Zn deep drawing alloy. Also,
As the resin layer, a polyethylene-based polymer film having a thickness of 70 μm was used.

The press forming test was carried out by changing various materials and plate thicknesses as shown in Table 2.

Table 1 shows the mechanical properties of the materials used in the test, and Table 2 shows the test results.

 The following is considered from Table 2.

(1) With the same thickness, any combination of aluminum plates cracks and cannot be formed (No. 1 to No. 4,
No. 21 to No. 22).

(2) Even if the thickness of the soft material (A material or B material) is changed, cracking occurs and molding is impossible (No. 5 to No. 8).

(3) In the case of high-strength materials (C material and D material), wrinkles were generated when a thick material was arranged on the outside, although cracking did not occur (No. 10, No. 12).

(4) When a soft material was used on the outside and a high-strength material was used on the inside, cracks occurred even when the plate thickness was changed (Nos. 13 to 18).

(5) When a high-strength material was used on the outside and a soft material was used on the inside, and the outside plate was thinner than the inside, cracks occurred (N
o.19, No.20), when the thickness was the same or thicker, it was possible to form without cracks and wrinkles (No.23 to No.30).

A press forming test was performed using an aluminum plate of another material, and similar results were obtained.

(Effects of the Invention) As described above in detail, according to the present invention, since the outer and inner aluminum materials and the plate thickness are regulated, the press formability can be significantly improved. Therefore, the effect of expanding the application range of the aluminum composite plate by utilizing the lightness of the aluminum material together with the excellent press formability is remarkable.

[Brief description of the drawings]

 FIG. 1 is a cross-sectional view illustrating the structure of the vibration damping material. …… Metal material …… Resin layer.

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Claims (1)

(57) [Claims] 1. A press-formed composite plate having a resin layer between two aluminum and aluminum alloy plates,
Aluminum and aluminum alloys characterized by using a material having a higher strength than the inner aluminum plate for the outer aluminum plate during press forming, and making the outer aluminum plate thickness equal to or greater than the inner aluminum plate thickness Composite plate for press forming.