JPS62183336A - Laminated metallic plate having excellent vibration-damping property - 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 the Invention The present invention relates to a sandwich structure having good specific stiffness and vibration damping properties at the same time.

BACKGROUND OF THE INVENTION In recent years, noise caused by automobiles has become a social problem. Also, from the comfort point of view inside the car.

There is a need for noise countermeasures, especially for diesel cars. In particular, as a measure to reduce vibrations around engines, vibration-damping steel plates, which are sandwiched between two steel plates using a viscoelastic resin as a damping material, are beginning to attract attention (Plasticity and Processing, Vol. 26, No. 281, 384-389).

However, the damping steel plate has a structure in which a thin soft viscoelastic resin of about 0.05 m is sandwiched between thick steel plates of about 0.4 to 0.8 yrm, and when the damping steel plate vibrates, the resin layer is sheared ( By generating plastic deformation (slip), energy is absorbed and exhibits vibration damping properties.Conversely, since shear deformation occurs between the skin steel plates with a small amount of force, the bending rigidity is This is significantly lower than that of cold-rolled steel sheets. For this reason.

In order to ensure the same rigidity as a cold-rolled steel plate with a damping steel plate, the total thickness must be increased, that is, the amount of steel plate used must be increased, resulting in an increase in weight.

When a vibration-damping steel plate that causes such an increase in weight is used as a structural member, it is heavy itself, and at the same time, the rigidity of the members that support it must also be improved, resulting in an increase in the weight of the entire structure and The increase in the amount of steel used leads to increased costs and increased fuel consumption in automobiles, etc.
This is not necessarily an advantageous direction given the social situation where energy and cost savings are emphasized.

In this sense, there is a real need for lightweight materials with high vibration damping performance, which can be used in fields other than automobiles, such as chatter noise, etc.
Demand is also high for home appliances, furniture, and building materials that require reduction of impact noise.

Problems to be Solved by the Invention The present invention provides a laminated metal plate that is lightweight and has excellent vibration damping properties in response to the above social demands.

A laminated metal plate is a laminate of steel plate-resin-steel plate in which an elastic resin (core material) such as nylon-6 or polypropylene is sandwiched between two metal plates (skin metal plate).The skin and core material resist external forces. It deforms as a unit, and there is no shear deformation between the skin and the core material like with damping steel plates. Therefore, the bending rigidity is almost the same as that of the metal plate with the same overall thickness, and the center Since the specific gravity of the resin layer is about 1/3 to 1/8 of that of the metal plate, it is possible to reduce the weight by several tens of percent. However, in terms of damping properties, the resin layer does not undergo plastic deformation due to shearing, so the mechanism in the damping steel plate does not produce damping properties. This invention relates to a laminated metal plate that provides vibration damping properties to a metal plate using a new mechanism, and that enables vibration damping properties and weight reduction at the same time.

Means to solve problems The gist of the invention is as follows. Namely.

(1) In a laminated metal plate formed by sandwiching and fixing a resin layer between metal plates, the joint surface between the metal plate and the resin layer is composed of a resin part and a substance part other than resin, and the area ratio shown by the following formula is A laminated metal plate with excellent vibration damping properties, which is within the range of 2596 or more and 98% or less.

(2) In the non-resin substance part of (1) above, vibration damping characterized by intervening between the total area of the non-resin substance part + the resin part, and whose thickness is smaller than the thickness of the resin layer. A laminated metal plate with excellent durability.

(3) In the non-resin material part of (1) above, there is no resin layer in the non-resin material part, and the material part has excellent vibration damping properties, characterized by being composed only of the non-resin material part. Laminated metal plate.

Effects The present invention has discovered that when a substance other than resin is provided on the bonding surface between the skin metal plate and the resin layer, vibration damping properties can be imparted to the laminated metal plate without reducing its specific rigidity. It is something.

That is, according to experiments conducted by the present inventors, for example, two skin metal plates were made of a 0.2-inch steel plate (SPB-TI), and the core material was an adhesive polypropylene sheet made by Ube Industries, and the total thickness was 0. .3 A laminated steel plate was manufactured by hot pressing so as to make a meal. In this case, the resin film should be cut out in advance at the point where the material other than the resin is to be made, and the material other than the resin should be inserted, or a depression should be made in the polypropylene resin film, the material other than the resin should be placed there, and the material should be hot pressed with the steel plate. A substance other than resin was provided by the above method.

The horizontal axis is the percentage (%) of the total area of material parts other than resin (total area of material parts other than resin + total area of resin parts), and the vertical axis is the loudness of the hitting sound (dB (G)) As shown in FIG. 2, when the area ratio was 25% or more, a significant decrease in the magnitude of the hitting sound, that is, an improvement in vibration damping performance, was observed. Here, the mark in the figure indicates a case where the resin layer 8 does not exist in the non-resin material part 9 as shown in FIG. If there is, the O mark indicates resin R8 as shown in Figure 4 (1).
In other words, a substance other than resin is present only in the bonding surface portion, and a resin layer is present in the other thickness direction. Note that 7 indicates a skin metal plate.

In the present invention, vibration damping performance was evaluated by reducing the sound of the object being hit. That is, as shown in the diagram, a steel ball 4 is dropped horizontally in a pendulum shape and hit the center of the test panel 3 fixed to the wall 1 with a knife 2, and the generated sound is transmitted to the microphone 5.
was captured and analyzed using Analyzer 6.

In addition, the above area ratio and bending stiffness kg/height 2/mm)
When the relationship was investigated, as shown in FIG. 3, good rigidity was shown at 98% or less. The meanings of the symbols in FIG. 2 are the same as in FIG.

The bending stiffness measurement jig conforms to ASTM D-790 and has a specimen shape of 501111. Length 150m5
, Bending Span 100
c) In order to achieve ), there must be at least 25% non-resin material.

Further, the upper limit is an area ratio of 98% as a range in which a decrease in bending rigidity is acceptable.

Also, there are two joining surfaces, upper and lower, between the metal plate and the resin layer.
In the present invention, when a material layer other than resin is interposed between the resistant resin layer and the metal plate, it is sufficient to have the material layer other than resin on at least one of the bonding surfaces. There is no problem in having a layer of material other than resin on the bonding surface.

Next, the metal plates to be used as the skin are not particularly limited, but examples include cold-rolled thin plates, various plated steel plates, organic coated steel plates, chemically treated steel plates, patterned steel plates, mild steel plates, high-strength steel plates, pure aluminum plates, and various other metal plates. Examples include aluminum alloy plates, pure copper plates, copper alloy plates, and stainless steel plates. In addition, a steel plate or striped steel plate with an uneven surface may be used, or two different types of metal plates may be used simultaneously for the two skins, the thickness of which is determined by the use and desired performance. Although there is no particular limitation, it is typically about 0.1 to 2 layers.

In addition, resins used as the core material (resin layer) include polyolefins such as polypropylene, polyethylene, and poly4-methylpentene-1, which are commonly used in laminated metal plates, polyamides such as vinyl chloride polymers, cellulose polymers, and nylon. Polyesters such as polyethylene terephthalate, polycarbonates, and epoxy resins.

Examples include acrylic resin, polyurethane, and the above-mentioned modified resins (JP-A-55-158052, etc.)
Further, the thickness of the resin layer, like the thickness of the skin metal plate, is determined depending on the use and desired performance and is not limited, but is typically about 0.05 to 5 layers.

In addition, as substances other than 1 resin, it is effective to use substances that easily change their overall shape and absorb energy through deformation resistance, that is, frictional resistance, and flow resistance.For example, glass powder, aluminum powder, iron powder, copper powder, stainless steel powder, etc.; laminates of foils of aluminum, iron, copper, gold, etc.; vaseline.

Highly viscous fats and oils such as silicone oil and mixtures thereof can be used. Furthermore, spot weldability can be imparted by adding a conductive substance.

Laminated metal plates can be manufactured using the usual hot press method, a continuous line method in which heat fusion is performed continuously, or a method in which the core material and metal plate are bonded with adhesive (batch or continuous methods are possible). be.

When vibration occurs, the skin metal plate vibrates in the non-resin material part, the vibration causes the non-resin material to vibrate, and the non-resin material layer converts the vibrational energy into thermal energy, suppressing the vibration. It seems to be a demonstration of sexuality.

Next, although the size and shape of the non-resin material parts are not particularly limited, it is necessary that the non-resin material parts and the resin parts are arranged alternately. That is, it is necessary that the material parts other than resin are randomly arranged in the resin part (or the resin part is in the material part other than resin).

Examples of the arrangement are illustrated in FIGS. 5 to 8. The shaded areas indicate material parts other than resin, and the blank spaces indicate resin parts.

Example Table 1 shows examples (standards) for comparison.

The weight reduction rate is the percentage of the metal plate used as the skin material alone when the bending rigidity is the same. Comparative Example 1 is a normal laminated steel plate. Comparative Example 2 is a cold rolled steel plate. Both have poor vibration damping properties.

Table 2 shows examples in which a layer of material other than resin is provided between the metal plate and the resin layer. The shape of the material part other than resin or the resin part is of three types: square, circular, and rectangular.

Table 3 shows examples in which no resin layer is present. There are three shapes of the material part other than resin or the resin part: square, circular, and rectangular.

For the surface metal plate, apply 2 coats of weak alkaline degreasing liquid to the steel plate.
m1n, for pure aluminum plate, 1 with 3% NaOH aqueous solution
0 in. For steel plates, 2 in. with 10% NHO3 aqueous solution.
Each degreased version of win was used.

A hot press method was used to fix the resin layer and the metal plate. When using polypropylene (PP), the hot press conditions are: Raise the temperature to 180℃, hold 2 intestines, and then press at 13℃.
It was cooled to 0°C, and when nylon-6 (NY) was used, it was heated to 220°C, maintained at 2 ml, and then cooled to 140°C. The pressure of the hot press is always 2kg/cr.
It was n'.

In each case of Examples 1 to 18 in Tables 2 and 3, vibration damping properties were improved compared to the comparative example, even though the weight was reduced.

(Leaving space below) Table 3 (Part 2) Detailed explanation of one embodiment of the invention According to the present invention, the weight of the laminated metal plate can be reduced, while maintaining a high specific stiffness (bending stiffness/specific gravity), It can provide vibration damping properties.

[Brief explanation of drawings]

Figure 1 is an elevational view explaining the hammering sound measurement method, Figure 2 is a diagram showing the relationship between the area ratio of the material part other than resin and the magnitude of the hitting sound, and Figure 3 is the relationship between the area ratio of the material part other than resin and the magnitude of the hitting sound. Fig. 4 (1) is a cross-sectional view of the laminated metal plate of the present invention when a resin layer is present in the material part other than the resin.
2) is a cross-sectional view of the laminated metal plate of the present invention in which the non-resin material portion is composed only of a material other than resin, Nos. 5 and 6;
．． Figure 7.8 is an explanatory diagram showing the shape of a substance other than resin. 1---fi, 2...naifetsuji, 3...test panel, 4...steel ball, 5mm microphone, 6...
・Analyzer, 7... Skin metal plate, 8... Core material (
resin layer), 9... material portion other than resin.

Claims (1)

[Claims] (1) In a laminated metal plate formed by sandwiching and fixing a resin layer between metal plates, the joint surface between the metal plate and the resin layer is composed of a resin part and a substance part other than resin, and the following formula is used: A laminated metal plate with excellent vibration damping properties, characterized in that the area ratio represented by is in the range of 25% or more and 98% or less. Area ratio (%) = [total area of material parts other than resin/(total area of material parts other than resin + total area of resin parts)] x 10
0 (%) (2) In the substance other than resin portion, the substance other than resin is interposed between the metal plate and the resin, and the thickness of the substance is smaller than the thickness of the resin layer. The laminated metal plate described in (1). (3) The laminated metal plate according to claim (1), characterized in that the space between the two skin metal plates is filled with only a substance other than resin over the entire thickness direction.