JP2910564B2 - Composite damping metal plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite type vibration damping metal plate in which a plurality of metal plates are stacked and bonded, and more particularly, to a weldability which does not require the use of an organic substance while being a composite type. It relates to an excellent composite damping metal plate.

[0002]

2. Description of the Related Art Vibration damping alloys generally used as damping materials and resin sandwich-type composite damping metal plates having a polymer resin sandwiched between two metal plates are all difficult to connect by welding. However, even if welding is possible, there is an essential disadvantage that the vibration damping property after welding is significantly reduced. A composite vibration-damping metal plate in which a plurality of metal plates are directly stacked and partially connected to solve this disadvantage (Japanese Patent Application Laid-Open Nos. 61-37316 and 61-373).
No. 17, JP-A-61-119390, JP-A-61-182820, JP-A-1-114432, JP-A-5-196091, and JP-A-5-20
No. 8212, Japanese Patent Application No. 5-89413).

[0003] This type of composite vibration damping metal plate developed by the present applicant has a remarkable feature that it does not require an organic substance, despite being a composite type in which a plurality of metal plates are stacked. As a result, it has excellent weldability, durability, and fire resistance, and has attracted great attention in recent years, for example, as floor materials and wall materials for ships. In this type of composite vibration-damping metal sheet, various forms are possible by changing the number of stacked metal sheets, the thickness ratio, the density of the welded portion, etc. For now, a form that should be called its basic form has been clarified. This will be described with reference to FIG.

The number of metal plates is set to three or more from the viewpoint of vibration damping. In this case, one is a main plate 1 serving as a strength member, and the other is a thin auxiliary plate 2 or 2 for exhibiting vibration damping properties. To prevent the auxiliary plates 2 and 2 from being excessively restrained, the auxiliary plates 2 and 2 are joined to the main plate 1 at a plurality of points in a spot-like manner by spot welding or the like. The coupling parts 3 are distributed and arranged as uniformly as possible with a certain interval or more so as not to lower the vibration damping property. Although depending on the size of the metal plate, usually, the four corners of the plate are connected, and the number of connection points is increased as necessary.

[0005]

In such a composite vibration-damping metal plate, when a vibration occurs, the frictional effect caused by the plates rubbing each other directly, and the mutual interference effect caused by the difference in the vibration mode of each plate. Thereby, excellent vibration damping properties can be obtained. In addition, since an organic material is not required, the end faces can be butt-welded. Furthermore, since there is no restriction on the component composition of the plate, it is easy to secure mechanical properties such as strength and toughness.

[0006] However, when the end faces are butt-welded, the auxiliary plates 2 and 2 are restrained, and there is a concern that the damping performance may be reduced. In addition, in the welding, bulging occurs due to welding heat in the thin auxiliary plates 2 and 2 in the vicinity of the welded portion, so that the finished state is not always good and the welding operation becomes difficult.

[0007] This kind of composite vibration-damping metal plate is rarely used as a single sheet, and it is considered that it is almost always used by joining by welding. In addition, a technique for improving the welding workability by eliminating deformation of the auxiliary plate due to welding heat is very important, but no effective technique has been developed yet.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a composite vibration damping metal plate capable of improving welding workability in end face butt welding without sacrificing vibration damping properties. And

[0009]

Means for Solving the Problems In a composite vibration damping metal plate as shown in FIG. 13 in which two or more auxiliary plates are stacked and connected to one main plate, which is a strength member, the auxiliary plate is not excessively restrained. Necessary to ensure vibration damping. In fact, when the density of the connection points is increased by decreasing the distance between the connection points, the damping property is lost. In order to ensure vibration damping, a certain interval or more is required.

[0010] On the other hand, however, the large space between the joining points causes insufficient fixing strength of the auxiliary plate at the peripheral portion, and causes the auxiliary plate to be thermally deformed by end face butt welding. According to the conventional thinking, it is necessary not to restrain the periphery of the auxiliary plate.
There was no effective countermeasure to prevent thermal deformation of the auxiliary plate because it was indispensable for ensuring vibration damping. Furthermore, the end face butt welding itself has been questioned from the viewpoint of vibration damping because the end face butt welding restrains the auxiliary plate.

However, in the process of investigating the influence of the coupling point distribution on the vibration damping property, the fact that the peripheral edge of the auxiliary plate is fixed and restrained does not necessarily cause a reduction in the vibration damping property. An unexpected fact turned out.

That is, when the connection point at the peripheral edge is far from the edge, the vibration damping performance is reduced by increasing the number of connection points, but when the connection point is close to the edge, the number of connection points is increased. However, the vibration damping property does not decrease, and the end face butt welding does not cause the deterioration of the vibration damping property. The closer the connection point is to the edge, the more the thermal deformation of the auxiliary plate due to end face butt welding is suppressed, and the arrangement interval of the connection points can be increased. Of course, if the board area is small, the vibration damping property will be lost if the peripheral stacking part of the board is completely fixed, but if a certain area or more of the board area is secured, the auxiliary plate should be fixed to the main plate at the periphery. Even
Damping does not decrease.

The present invention has been made based on such knowledge, and is constituted by stacking two or more auxiliary plates on one main plate as a strength member and partially connecting the three or more plates. In the composite vibration-damping metal plate, three or more stacked plates are joined at least at a peripheral portion, a distance d from an edge of the joining portion at the peripheral portion is 40 mm or less, and an edge of the joining portion is provided. When the interval l in the direction parallel to is l (mm) ≤ 300t ₂ -2.5d-75, t ₂ is the thickness of the thinnest auxiliary plate (mm). A gist is a composite vibration-damping metal plate characterized by the following.

[0014]

FIG. 1 shows an example of the composite vibration damping metal plate of the present invention.
In the composite vibration-damping metal plate of the present invention, the distance d from the edge of the joining portion at the peripheral portion is set to 40 mm or less because d>
When the thickness is 40 mm, the vibration damping property is reduced, and the auxiliary plates 2 and 2 are easily deformed by end face butt welding. Desirably, d ≦ 30 mm.

The lower limit of d is not limited. This means that d = 0 may be used. When d = 0, as shown in FIG. 2, three or more stacked end faces are welded to join three or more plates. In FIG. 2A, the connection is performed in a point shape along the edge, but in FIG. 2B, the connection is performed linearly along the edge, and the end of the connection portion is formed. The interval l in the direction parallel to the edge is also zero.

The reason why the interval 1 between the joining portions at the peripheral portion is l ≦ 300t ₂ −2.5d−75 (= A) is that when 1> A, the auxiliary plates 2 and 2 are thermally deformed by end face butt welding. It is. The lower limit of l is not limited. That is, l = 0 may be used, and when l ≦ 0, all are treated as l = 0.

In the composite vibration damping metal plate of the present invention, d = 0 and l = 0 are possible regardless of the thickness of the auxiliary plate. As shown in FIG. 2B, this state is obtained by joining three or more stacked plates together linearly at their end faces. It should be noted that the vibration damping property does not decrease even in this state, and the welding workability in the end face butt welding is naturally good. In addition, the plate mating portion exposed at the end face is sealed, so that deterioration of the vibration damping property over time due to rusting of the mating face is prevented.

The connection of d> 0 and l> 0, that is, the point connection of d> 0 (FIG. 1) can be performed by spot welding, bolting, rivet connection or the like. The connection of d> 0 and l = 0, that is, the line connection of d> 0 can be performed by seam welding or the like. The connection of d = 0, l> 0, that is, the point connection of d = 0 [FIG. 2 (A)] can be performed by end face arc welding in the thickness direction. The bonding of d = 0 and l = 0, that is, the line bonding of d = 0 [FIG. 2 (B)] can be performed by laser welding of the plate joining portion exposed on the end face, end face arc welding using combined weaving, or the like. it can.

In the case where a groove for welding is applied to the end face, the distance from the edge to the joint 3 in the state where the groove is provided is d in this case.

In portions other than the peripheral portion, it is desirable that the connection is performed in a point-like manner so as not to lower the vibration damping property.
In this case, the interval between the joining points is desirably 50 · t ₁ ^1/2 mm or more. If this interval is less than 50 · t ₁ ^1/2 mm, the vibration damping property is reduced. This interval is an interval in a case where the joint existing at the peripheral edge is included. The upper limit is not limited. This means that the welding point does not need to be present in a portion other than the peripheral portion.

The plate area is preferably at least 0.25 m ^2, more preferably at least 0.5 m ² . If it is less than 0.25 m ² , the vibration damping property is reduced when the peripheral portions are densely connected in a point-like manner or linearly. If it is 0.5 m ² or more, the vibration damping property does not decrease even if the entire periphery is linearly joined.

It is desirable that at least one of the auxiliary plates is a curved plate that is plastically deformed in an arc shape convex toward the main plate in a state where the auxiliary plate is not stacked and coupled to the main plate. By doing so, when the auxiliary plate is stacked and connected to the main plate, the auxiliary plate is in close contact with the main plate, and good vibration damping properties can be obtained.

The thickness t ₂ of the auxiliary plate with respect to the thickness t ₁ of the main plate
The ratio (t ₂ / t ₁ ) is desirably 0.1 to 0.5. When the plate thickness ratio exceeds 0.5, the vibration characteristics of the main plate and the auxiliary plate are similar, and the mutual interference effect due to the difference between the respective vibration modes is insufficient. On the other hand, when the plate thickness ratio is less than 0.1, the relative rigidity of the auxiliary plate with respect to the main plate is insufficient, so that the vibration damping property is also lowered.

The materials of the main plate and the auxiliary plate are basically the same type of steel plate, but may be the same type of metal plate other than the steel plate. If they are not the same type, it is difficult to butt-weld the end faces. Further, since the idea of this kind of composite vibration-damping metal plate lies in that a single plate is divided into a plurality of plates and recombined in order to obtain vibration damping properties, the same type of plate is fundamental. However, if there is no problem in weldability and the like, different types of plates may be used.

The position of the auxiliary plate is basically a sandwich type in which the auxiliary plate is disposed on both sides of the main plate, but the same vibration damping effect can be obtained by collecting the auxiliary plate on one side. Further, when the plate thickness is changed between the auxiliary plates, a higher damping effect may be obtained.

As described above, for the end face seal, linear welding of the end face (FIG. 2B) is effective. However, when this welding is not performed, a resin having water-penetration resistance is applied to the end face. Is also good. These end face seals may be applied to each of the damping metal plates, or may be applied to the exposed end surfaces remaining after butt welding a plurality of damping metal plates.

[0027]

EXAMPLES Examples of the present invention will be described below, and the effects of the present invention will be clarified by comparing with conventional examples and comparative examples.

The two auxiliary plates made of SS400 are
400 were attached to both sides of a single auxiliary plate. The edges were joined by spot welding when d> 0, l> 0, and by edge arc welding when d = 0, l> 0 and d = 0, l = 0. Each of the two auxiliary plates was a curved plate that was plastically deformed in an arc shape protruding toward the main plate in a state where it was not stacked and coupled to the main plate. The convex ratio is represented by S / L shown in FIG. 10 unless otherwise specified.
0.1. Regarding the connection of the portions other than the edge portions, one spot at the center was spot-welded unless otherwise specified.

FIG. 3 shows the obtained composite vibration damping metal plate.
The maximum sound pressure was measured by hammering as shown in (1). In addition, as shown in FIG. 4, end face butt welding was performed, and the presence or absence of blistering due to welding heat of the auxiliary plate was examined. Welding is performed by submerged arc welding, and heat input is 30 kJ /
cm.

Distance d from the edge of the joining point at the periphery
FIG. 5 shows the effect of the pressure on the maximum sound pressure. Common condition, the thickness t ₁ of the main plate is 3.2 mm, the thickness t ₂ of the auxiliary plate 1.
2 mm, the board area was 0.25 m ² (0.5 mx 0.5 m). As can be seen from FIG. 5, the vibration damping property is excellent when d ≦ 40 mm.

FIG. 6 shows the effect of the distance l between the joining points at the peripheral edge and the thickness t _{2 of the} auxiliary plate on the presence or absence of blisters when d = 40 mm, 20 mm, and 0 mm. Common condition, the thickness t ₁ of the main plate is 6.4 mm, the plate area 0.
It was 5 m ² (1 m × 0.5 m). As can be seen from FIG. 6, blistering is prevented when l ≦ A (300t ₂ -2.5d-75).

FIG. 7 shows the effect of the plate area on the maximum sound pressure. The thickness t ₁ of the main plate as the common condition 3.2 mm, the thickness t ₂ of the auxiliary plate was 1.6 mm, d and l is zero. As can be seen from FIG. 7, by setting the plate area to 0.25 m ² or more, excellent vibration damping properties can be obtained even when the auxiliary plate is fixed to the main plate over the entire periphery.

FIG. 8 shows the effect of the interval between the coupling points in the portion other than the peripheral portion on the maximum sound pressure. As a common condition,
The board area is 0.5m ² (1m × 0.5m), d is 10mm, l
Was set to 200 mm. As can be seen from FIG. 8, when the interval between the welding points is 50 · t ₁ ^1/2 or more, the vibration damping property is excellent.

The thickness t ₂ of the auxiliary plate with respect to the thickness t ₁ of the main plate
FIG. 9 shows the effect of the ratio (t ₂ / t ₁ ) on the maximum sound pressure. As a common condition, the board area is 0.5 m ² (1 m × 0.5
m) and d were 10 mm, and l was 200 mm. As can be seen from FIG. 9, the thickness ratio of the auxiliary plate to the main plate (t ₂ / t)
_{When 1} ) is 0.1 to 0.5, the vibration damping property is excellent.

FIG. 10 shows the effect of the convex ratio (S / L) of the auxiliary plate on the maximum sound pressure. As a common condition, the board area is 0.5
m ² (1m × 0.5m), the thickness of the main plate is t ₁ is 3.2 mm,
The thickness t ₂ of the auxiliary plate is 1.6 mm, d is 10 mm, and l is 20
0 mm. As can be seen from FIG. 10, the use of the curved plate as the auxiliary plate improves the vibration damping property.

FIG. 11 shows the influence of the position, number, and material of the auxiliary plates on the maximum sound pressure. As common conditions, the board area is 0.5 m ² (1 m × 0.5 m), d is 10 mm, and l is 20
0 mm. As can be seen from FIG. 11, similar results are obtained when two auxiliary plates are arranged on one side of the main plate, when three or more auxiliary plates are used, and when the auxiliary plates are made of dissimilar metals.

When the M6 bolt was used in place of the spot welding, the same results as those in FIGS. 5 to 11 were obtained.

Next, when the plate area is 0.5 m ² (1 m × 0.5
m), the thickness t ₁ is 3.2mm of the main plate, the thickness t ₂ is 1.6mm auxiliary plate (2 sheets), a composite damping metal sheet d is 10 mm, the present invention l is a 200mm [1 ), A silicone resin (Toray Silicone Sealant) and a tar epoxy (Shinto Paint Opia 3000) were applied. These and the composite vibration-damping metal plate of the present invention in which d = 0 and l = 0 (FIG. 2B) were subjected to a salt spray test for 250 hours. FIG. 12 shows the result of measuring the maximum sound pressure before and after the test.

In the case without the end face seal, the mating surfaces rusted in the salt spray test and the vibration damping property was reduced, but when the face face was sealed, no decrease in the vibration damping property was observed in the salt spray test. Was.

[0040]

As described above, the composite vibration-damping metal plate of the present invention can be formed by joining an auxiliary plate to a main plate at an edge portion under specific conditions, thereby abutting the end surfaces without sacrificing the vibration-damping property. Thermal deformation of the auxiliary plate during welding can be prevented, and the welding workability can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a composite vibration damping metal plate of the present invention.

FIG. 2 is a perspective view showing another embodiment of the peripheral edge connection.

FIG. 3 is an explanatory diagram of a method of measuring a vibration damping property (maximum sound pressure).

FIG. 4 is an explanatory view of an end face butt welding method.

FIG. 5 is a graph showing an influence of a coupling state at a peripheral portion on a maximum sound pressure.

FIG. 6 is a graph showing the effect of the connection state at the peripheral edge on the presence or absence of blisters due to end face butt welding.

FIG. 7 is a graph showing the effect of the plate area on the maximum sound pressure.

FIG. 8 is a graph showing the effect of the interval between welding points at portions other than the edge portion on the maximum sound pressure.

FIG. 9 is a graph showing the effect of the ratio of the thickness t ₂ of the auxiliary plate to the thickness t ₁ of the main plate (t ₂ / t ₁ ) on the maximum sound pressure.

FIG. 10 is a graph showing the effect of the convex ratio of the auxiliary plate on the maximum sound pressure.

FIG. 11 is a graph showing the influence of the position, number, and material of auxiliary plates on the maximum sound pressure.

FIG. 12 is a graph showing the effect of the end face sealing method on rusting of mating surfaces.

FIG. 13 is a perspective view showing a conventional composite vibration damping metal plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main board 2 Auxiliary board 3 Joining part

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B32B 15/01 B21C 37/00 B32B 7/08

Claims (3)

(57) [Claims] 1. A composite vibration damping metal plate formed by stacking two or more auxiliary plates on one main plate as a strength member and partially connecting the three or more plates. Three or more plates are joined at least at the peripheral edge, and the distance d from the edge of the joint at the peripheral edge is 40 mm or less;
And, the interval l in the direction parallel to the edge of the joint is l (mm) ≦ 300t ₂ −2.5d−75, where t ₂ is the thickness (mm) of the thinnest auxiliary plate. A composite vibration damping metal plate characterized by a line connection along an edge. 2. A joint portion other than a peripheral portion is point-like, and an interval between the joining points is at least 50 t ₁ ^1/2 mm [t ₁ is the thickness (mm) of the main plate]. The composite vibration damping metal plate according to claim 1. 3. The composite vibration-damping metal plate according to claim 1, wherein the plate area is 0.25 m ² or more.