JPS61290044A - Vibration-damping composite metallic plate having excellent resistance weldability - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration-damping composite metal plate with excellent resistance weldability.

[Background of the Invention] In recent years, vibration-damping composite metal plates have been in the spotlight as a countermeasure against various noises. These composite metal sheets are used in a wide range of applications, including automobile parts, mechanical and electrical parts, various covers, building materials, and structures.

Many parts to which composite metal plates are applied are assembled by resistance welding such as spot welding. However, conventional composite metal plates have the disadvantage that resistance welding is difficult and cannot be welded unless a short circuit is provided. Therefore, it has been conventionally practiced to disperse conductive metal powder in the resin layer.

The following methods are known for dispersing conductive metal powder in a resin layer.

CI) A composite metal plate using a viscoelastic material containing 1 to 80% by volume of conductive metal powder finer than 100 mesh in the intermediate layer (JP-A-5O-79920).

However, this type of composite metal plate has the following drawbacks.

The cost is high because the amount of metal powder added is large, ranging from 1 to 80%.
The cost is high because it is kneaded into viscoelastic resin.

Since the amount added is large, vibration damping properties (ηwax) are low, adhesive strength (Tel separation) is low, and conductive efficiency is not necessarily good.
Therefore, resistance weldability is not necessarily good.

(II) Metal powder occupies 10 to 50% by weight of the resin layer, and 50% by volume or more of the conductive particles have a particle size larger than the required thickness of the damping layer (Japanese Patent Application Laid-Open No. 57-14H4 'l).

However, this type of composite metal plate also has a high cost due to the large amount of metal powder added, and resistance weldability is not necessarily good.

[Object of the Invention] The present invention has been made to solve the above-mentioned conventional drawbacks, and provides a vibration-damping composite metal with excellent vibration-damping properties, high interlayer adhesive strength, and inexpensive resistance weldability. The purpose is to provide a board.

[Summary of the Invention] The above object is to provide a composite metal plate formed by pressing a resin layer between two or more metal plates, in which metal powder or metal powder having a diameter of 100 to 200% of the film thickness is added to the resin layer. This is achieved by a vibration-damping composite metal plate with excellent resistance weldability, which is characterized in that the fibers or a mixture thereof are dispersed by 0.2 to 3.0% by volume of the resin depending on the compression force during compression.

It is not limited to the type of resin.

The metal powder or metal fiber has a thickness of 100 to 100% of the thickness of the resin layer.
200% diameter, and the amount of dispersion is 0.2 to 3.0% by volume of the resin.

The reason why the grain size is set to 100 to 200% of the film thickness is to make the short circuit between the metal plates 100%. If it is 200% or more, the deformation of the grains and the biting into the metal plate will become large (
Figure 1 (a)), causing unevenness on the metal plate surface (Figure 1 (b)
)).

The reason for setting the dispersion amount to 0.2 to 3.0% by volume is that if it is less than 0.2% by volume, resistance welding may not be possible, and if it is more than 3.0%, the vibration damping performance and adhesive strength begin to decrease. It is from.

The dispersion of metal powder, metal fibers, or a mixture thereof is performed by applying pressure when pressing a resin layer between metal plates. For example, as shown in FIG.
Figure 2 (a)).

In order to supply metal powder etc. 6 onto the resin layer 4 (Fig. 2(b)),
Further, with another metal plate 2 placed on top of the metal powder etc. 6, it may be pressed and bonded with, for example, a rolling roller 8 (FIG. 2(C)).

[Embodiments of the invention] The invention will be described in detail below.

(First example) As shown in Table 1, the thickness of the metal plate is 0.81.

Composite metal plates were created by varying the thickness of the resin layer, the resin layer thickness (T) of 50IL, and the metal powder diameter CD).

A polyolefin resin was used as the resin.

Copper powder was used as the metal powder. The amount of dispersion is 0.8 of the resin.
The method of zero dispersion expressed as volume % is shown in Figure 2.

That is, the bonding was carried out by pressure bonding.

The composite metal plates thus produced were spot welded together as shown in FIG. The welding conditions are as follows.

Spot Welding Conditions All of the composite metal plates according to this example had good weldability (Table 1).

(Second Example) In this example, a metal composite plate with a metal plate of 0.8 +wm and a resin layer of 50 tiles thick was made of copper with a thickness of 63 mm φ
A three-layer m L (D/T: 12Et%) metal fiber was used.

The amount of dispersion was varied as shown in Table 2.

The crimping method and spot welding conditions are the same as in the first embodiment. However, as a partner for welding composite metal plates, we have also used single plates in addition to composite metal plates.

Regarding weldability in Table 2, as shown in Figure 4, the dispersion amount is 0.2
In the range of ~3.0% by volume, both the composite metal plate and the single plate were good.

Furthermore, in order to examine the damping properties, the loss coefficient was measured, and as shown in FIG. 5, excellent damping properties were obtained in the range of 0.2 to 3.0% by volume.

Furthermore, when the T11 peel strength between the metal plate and the resin layer was tested, as shown in FIG. 6, the T peel strength was excellent in the range of 0.2 to 3.0% by volume.

[Effects of the Invention] As described above, according to the present invention, a vibration-damping composite metal plate having excellent vibration-damping characteristics, high interlayer bonding strength, and excellent resistance weldability can be obtained at an inexpensive price.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a defective example. FIG. 2 is a sectional view showing an example of manufacturing a composite metal plate according to the present invention. FIG. 3 is a sectional view showing welding conditions. FIG. 4 is a graph showing the relationship between the amount of dispersion of metal phi/<- and weldability. FIG. 5 is a graph showing the relationship between the amount of dispersion of metal fibers and the loss coefficient. FIG. 6 is a graph showing the amount of dispersion of metal fibers and T-peel strength. 2... Metal plate, 4... Resin layer, 6... Metal powder, 8
... Rolling roller, 10 ... Composite metal plate, A ... Irregularity, B ... Deformation, C ... Biting.

Claims (1)

[Claims] In a composite metal plate constructed by pressing a resin layer between two or more metal plates, the resin layer has a film thickness of 10
Metal powder or metal fiber with a diameter of 0 to 200%,
Or a vibration-damping composite metal plate with excellent resistance weldability, characterized in that a mixture thereof is dispersed in an amount of 0.2 to 3.0% by volume of the resin depending on the pressure applied during pressure bonding.