JPH0327934A - Laminated steel plate - Google Patents

Abstract

PURPOSE:To improve damping properties and peel strength by providing dispersedly recessed parts having the depth being a predetermined value or more and the same or less as the plate thickness of a metal plate by a embossing process on the resin adhesion surface of inner surface side of a metal plate in its one side or both sides, and making the outer surface side of the metal plate into a plane, or the parts corresponding to the recessed parts into protruding parts. CONSTITUTION:On the resin adhesion surface of inner surface side of a metal plate in its one side or both sides, the recessed parts having the depth being 10mum or more and the same or less as the plate thickness of the metal plate by an embossing process. The outer surface side of the metal plate 2 is a plane or protruding parts 5 in the parts corresponding to the recessed parts 4. Namely, it is made 10mum or more in its depth D, and has the depth being the same or less as the plate thickness of the metal plate. In the case where the depth D is 10mum or less, the improved effect of damping properties is small, and in the case where the depth is made the same or more as the plate thickness of the metal plate, the improved effects of peel strength and damping properties or the like may be saturated, and thus it becomes disadvantageous in its cost. Accordingly, the peel strength and damping properties can be improved thereby.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to laminated steel plates that are used in large quantities for various building materials, electrical equipment, automobiles, etc., and particularly relates to laminated steel plates that have improved adhesive strength, vibration damping properties, or sound absorption properties. Resin bonding [Prior art] Laminated steel plates, which are made by bonding various metal plates such as steel plates, stainless steel plates, aluminum plates, or titanium plates to steel plates or stainless steel plates via resin adhesives, have various advantages and characteristics. Its uses are expanding, primarily as building materials, home appliances, and panel members for vehicles. One of the characteristics of these laminated steel plates is that they have vibration resistance or sound absorption properties.

However, such resin-bonded laminated steel sheets inherently have low peel strength, and adhesives with viscoelastic properties that have good vibration damping properties generally have low peel strength, which is a contradictory tendency for manufacturing. There were problems such as difficulty in optimizing conditions. For this reason, increasing the thickness of the resin adhesive layer has traditionally been adopted as the simplest method to improve properties such as adhesive strength and vibration damping. There are also problems in that it requires a lot of time and is disadvantageous in terms of cost. Although it is different from the spirit of the present invention, Japanese Patent Application Laid-Open No. 56-69151 proposes a laminated board, that is, a laminated board intended to adjust the external design by embossing the outer surface of a metal plate. ing.

However, since the laminated steel plate described above has a uniform adhesive layer thickness, there is no difference from conventional laminated steel sheets in terms of adhesive strength, vibration damping properties, and other properties.

In addition, plate warping is a problem peculiar to the lamination of dissimilar metal plates having different coefficients of thermal expansion, and this tendency is particularly large in the case of laminated steel plates using titanium as the metal plate. At present, no effective method has been found to solve this problem, and the only measures that have been taken are to cool the material as quickly as possible after pressure bonding by roll crimping or hot press to freeze the shape.

[Problem to be solved by the invention]

In view of the above-mentioned problems, an object of the present invention is to provide a laminated steel plate having superior vibration damping properties and high peel strength compared to conventional laminated steel plates even when the average thickness of the resin adhesive layer is the same.

[Means for Solving the Problems] That is, the present invention provides a laminated steel plate in which a metal plate is bonded to one or both sides of a steel plate or a stainless steel plate via a resin adhesive layer, in which the inner surface of the metal plate on one or both sides The resin adhesive surface of is provided with dispersed recesses with a depth of 10 μ or more and less than the thickness of the metal plate by embossing, and the outer surface of the metal plate is flat or has a convex portion corresponding to the recess. The laminated steel plate is characterized in that the resin adhesive layer has a thickness of 15 μm to 200 μm in the recessed portion of the metal plate and 5 μm to 190 μm in the other flat portion.

[For production]

Hereinafter, a method for carrying out the present invention will be described in detail.

FIGS. 1 and 2 are cross-sectional views for explaining embodiments of the present invention, and FIG. 1 shows a recess formed by embossing on the resin adhesive side, that is, the inner surface of the metal plate bonded to the support plate. FIG. 2 shows an example of a laminated steel plate provided with a concave portion on the inner surface and a corresponding convex portion on the outer surface.

In these figures, 1 is a steel base made of a steel plate or a stainless steel plate, 2 is a metal plate, 3 is a resin adhesive layer, 4 is a recessed part, and 5 is a convex part.

The steel substrate 1 used in the present invention is a steel plate or a stainless steel plate (these are collectively referred to as a steel plate), and the metal plate 2 may be any metal such as a steel plate, a stainless steel plate, an aluminum plate, or a titanium plate.

The thicknesses of the steel substrate 1 and the metal plate 2 are not particularly restricted and may be selected appropriately depending on the use and purpose; however, one of the purposes of the present invention is to provide an inexpensive laminated steel plate with excellent corrosion resistance. It is desirable that the thickness of the metal plate be smaller than that of the steel substrate.

Incidentally, it is not preferable to excessively increase the thickness of a metal plate made of, for example, titanium, which has a low modulus of elasticity, as this tends to cause peeling force due to springback force after press working such as bending work.

After cleaning the surface of these metal plates with an organic solvent or alkaline solution, the metal plate 2 is embossed, and then a resin adhesive layer 3 is formed so that the adhesive is spread throughout the recesses 4.

Although the shape of the plate surface of the embossing pattern is not particularly limited, the shape of the cross section of the plate, particularly the depth D shown in FIGS. 1 and 2, is an important component of the present invention.

That is, in the present invention, the above-mentioned depth D is set to a depth of 10 μ or more, but less than the same thickness as the metal plate. depth,
When D is less than 10, the effect of improving damping properties is small, and when the depth is equal to or greater than the plate thickness, the effects of improving peel strength, damping properties, etc. are saturated, which is disadvantageous in terms of cost.

Note that the appropriate range of this depth D varies depending on the embodiment shown in FIGS. 1 and 2 due to constraints from the embossability and strength aspects of the metal plate. Since it is impossible to equalize the plate thickness, ioR
It is desirable to set it to about n or more and about % or less of the plate thickness.

After the metal plate is embossed, the plate surface on the side of the recess 4 is coated with a resin adhesive. It is possible to use liquid, powder, film, etc. as the resin adhesive, but the depth D
If this is large, a liquid adhesive or a type of adhesive that melts by preheating after application is preferable from the viewpoint of adhesion to the recess 4. Note that the resin adhesive may be coated on the metal plate 2 or more before embossing.
In addition, the adhesive surface side of the steel substrate 1 may also be coated. After coating a metal plate or a metal plate and a steel substrate with a resin adhesive, the adhesive surfaces of each plate are placed facing each other and bonded using heat press or the like to form a laminated steel plate as shown in Figure 1 or Figure 2. Create.

Here, in the present invention, the thickness of the resin adhesive layer is 15 to 200μ in the recessed part of the metal plate, and 5 to 190μ in other flat parts.
By doing so, adhesive strength and vibration damping properties are more significantly exhibited. If the thickness of the resin adhesive layer is less than 15 μm and 5 μm in the concave portion and flat portion, respectively, it is difficult to provide sufficient properties such as adhesive strength and vibration damping properties, while if the thickness exceeds 200 μm and 190 μm, respectively, these The effect is saturated and it is not a good idea from a cost perspective.

In the present invention, there are no particular restrictions on the regularity of the plate surface shape, size, arrangement, etc. of the embossed pattern, but if the area of the embossed part, that is, the recessed part 4, is too small or the pattern is too large, the conventional The effect is not much different from that of laminated steel plates that are bonded together with their flat surfaces facing each other. Therefore, the size of one pattern of the recess 4 is about 1 cd or less,
The total area of the recesses is about 30 to 70% of the surface area of the board.
It is desirable to keep it at a certain level.

In the present invention, the metal plate 2 may be attached not only to one side of the steel base 1 but also to both sides.

Furthermore, the surface may be appropriately colored or subjected to anti-rust treatment by a known method such as painting, film adhesion, or anodizing, depending on the use and purpose.

In this way, a laminated steel plate in which a recess is formed by embossing on the adhesive side of a metal plate and this is used as an adhesive interface is different from conventional laminated steel plates in which the same amount of adhesive is used to create a resin adhesive layer of uniform thickness. Compared to steel plates, it has higher adhesive strength and has much better properties such as vibration damping properties, and when used as an example in the embodiment shown in Figure 2, it is useful for external design as well as being resistant to stains caused by fingerprints, etc. It also has the advantage of being less noticeable.

Examples of the present invention will be described in detail below.

〔Example〕

Four types of metal plates A to D shown in Table 1 (!ill plate, stainless steel plate, titanium plate, and aluminum plate) whose surfaces were chromate-treated were subjected to embossing as shown in Figure 2 using an embossing roll. The cross-sectional shape of the recessed part of the embossed pattern is an irregular island shape with an area of about 1 to 100 mffl2,
The proportion of the total area of the recesses was approximately 50% of the total surface area of the plate.

The metal plate was bonded to one side of the steel substrate shown in Table 1 by roll-coating a thermosetting liquid adhesive using the concave surface of the metal plate as an adhesive surface and hot pressing.

The depth D of the recessed portion of the metal plate, the thickness of the resin adhesive layer at the recessed portion, the thickness at the plane portion excluding the recessed portion, and the average thickness thereof are also listed in Table 1. For comparison, the thickness of the resin adhesive layer was made uniform without embossing, and the thickness of the resin adhesive layer was made uniform.
Four types of laminated steel plates E-H, which were produced in the same manner as -D, were also prepared.

The T-peel adhesion strength and shear peel adhesion strength of the laminated steel plate thus produced were determined in accordance with JISK6854 and JISK6550, respectively, and the degree of plate warpage was determined by 1.
The amount of deflection per meter length and the damping properties were measured using the noise generated when ice is applied from a faucet at a height of 1 m.
The results are also listed in Table 1.

From these results, it is clear that the laminated steel sheet of the present invention is superior to the comparative laminated steel sheet in all properties.

〔Effect of the invention〕

The laminated steel plate of the present invention has high adhesive strength, has a good shape with little plate warping, and has excellent properties such as vibration damping properties, so it can be used for a variety of purposes, mainly as panel parts for building materials, home appliances, and vehicles. This will greatly benefit related industrial fields.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a laminated steel plate illustrating a laminated steel plate with recesses on the inner surface, which is an embodiment of the present invention, and Fig. 2 is a cross-sectional view of a laminated steel plate with recesses on the inner surface and the outer surface, which is another embodiment of the present invention. FIG. 2 is a cross-sectional view of a laminated steel plate having a protrusion on its side. 1... Steel base, 2... Metal plate, 3...
Resin adhesive layer, 4... Concave portion, 5... Convex portion. 3...Resin adhesive layer

Claims (1)

[Claims] 1. In a laminated steel plate in which a metal plate is bonded to one or both sides of a steel plate or a stainless steel plate via a resin adhesive layer, the inner resin adhesive surface of the metal plate on one or both sides is embossed. Recesses with a depth of 10 μm or more and less than the thickness of the metal plate are dispersed through processing, and the outer surface of the metal plate is flat or the part corresponding to the recess is a convex part. Characteristic laminated steel plate. 2. The thickness of the resin adhesive layer is 15 μm to 20 μm in the concave part of the metal plate.
The laminated steel plate according to claim 1, characterized in that the thickness is 0 μm and 5 μm to 190 μm in other flat parts.