JPH11201226A - Compound metallic damping plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compound metallic damping plate which is excellent in strength and flexural rigidity and is made light in weight without damaging damping property and weldability by making the compound metallic damping plate a corrugated plate in which an auxiliary metallic plate is intermittently joined to the upper surface and lower surface of a main metallic plate. SOLUTION: A main metallic plate 1 and two sheets of auxiliary metallic plates 2 are molded into corrugated shapes. This compound metallic damping plate is a compound metallic damping corrugated plate M1 in which each of the plates 1 and 2 are coupled by a point joining part 3. The compound metallic damping plate is a compound metallic damping flat plate M2 in which two sheets of flat plate auxiliary metallic plates 2-1 are coupled with the upper part and lower part of the main metallic plate 1 molded into corrugated shapes by the point welding part 3. Therefore, the compound metallic damping plate is large in flexural rigidity and is high in a damping ratio because each of overlapped plates is formed into a corrugated shape and is intermittently joined. And that, because resin is not used in the compound metallic damping plate, the compound metallic damping plate can be used for a structural member because the plate can be welded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping plate in which only a plurality of metal plates are laminated, and more particularly to a composite metal vibration damping plate which can be welded, has high strength and bending rigidity, and is lightweight.

[0002]

2. Description of the Related Art Damping materials include magnesium alloy, graphite cast iron, chromium steel, Cu-Mn alloy, Fe-Cr-Al alloy, etc., or a polymer resin material between two steel plates. There is a sandwich-type damping steel sheet sandwiching the. In any case, it is difficult to join by welding, or even if welding is possible, the vibration damping performance after welding often deteriorates.

In order to solve this problem, there has been proposed a composite metal vibration damping plate constituted by laminating metal plates and partially joining them by a spot welding method or a plug welding method (for example, Japanese Unexamined Patent Publication No. 61-1986). -37316 JP, JP-A-61-37317 JP,
See JP-A-61-119390, JP-A-61-182820, and JP-A-1-114432. Further, there has been proposed a composite metal vibration damping plate in which the area ratio at which the metal layer interval is 50 μm or less and the area ratio is 70% or more by a bolt joining method or a method of applying pressure after partial welding (for example, Japanese Patent Application Laid-Open No. H5-196091). , JP-A-5-20
No. 8212).

FIG. 3 is a perspective view showing an example of the proposed composite metal damping plate. As shown in the figure, this type of composite metal vibration damping plate M3 is composed of a main metal plate 1 and two auxiliary metal plates 2-2.
It is a flat plate provided with a plurality of joint portions 3 sandwiched between and joined through each other. The auxiliary metal plate 2-2 is directly or indirectly coupled to the main metal plate 1 at a predetermined interval by the joint 3, and mainly exhibits vibration damping performance. The main metal plate 1 is used as a strength member.

In such a composite metal vibration damping plate, when vibration is propagated, the main metal plate 1 and the auxiliary metal plate 2-2 are not completely joined together, so that the vibration mode However, mutual interference occurs. As a result, the metal plates rub against each other, and excellent damping performance can be obtained by the damping action due to the frictional force. In addition, since each metal plate has no restriction on the component composition, it is easy to ensure strength, toughness, and the like. Furthermore, since organic substances are not used to impart vibration damping properties, it is possible to perform butt welding of the end faces of the metal plate, and it is excellent in weldability, durability, fire resistance, etc. It is used as a structural material such as wall materials for buildings and buildings.

[0006]

However, in the above composite metal vibration damping plate, the auxiliary metal plate cannot be expected to have the effect as a strength member, so that the weight increases and the bending rigidity with respect to the weight is small. Therefore, the thickness of the auxiliary metal plate is reduced by reducing the thickness of the auxiliary metal plate in order to reduce the weight.However, the thickness of the auxiliary metal plate is reduced to about 1/16 of the thickness of the main metal plate from the vibration damping side. Is the limit. Also, in order to obtain the required bending rigidity of the structure, the thickness of the main metal plate requires, for example, 10 mm or more,
There is a problem.

An object of the present invention is to provide a composite metal vibration damping plate which is excellent in strength and bending rigidity and has a reduced weight without impairing the vibration damping properties and weldability.

[0008]

Means for Solving the Problems The present inventors have conducted research on composite metal sheets and confirmed that shaping the composite metal sheet into a corrugated shape improves the vibration damping effect, strength and bending rigidity. Completed the invention. The gist lies in the composite metal damping plate shown below or shown below (see FIG. 1).

A composite metal vibration damping plate M, which is a corrugated plate in which an auxiliary metal plate 2 is intermittently joined to the upper and lower surfaces of a main metal plate 1
1.

A composite metal damping flat plate M2 in which the main metal plate 1 is a corrugated plate, and an auxiliary metal plate 2-1 is intermittently joined to upper and lower portions of the corrugated plate.

The corrugated plate preferably has a wave height of 20 to 50 mm and a wave pitch length of 50 to 100 mm.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As a method for improving the bending stiffness of a plate material, a method of forming a corrugated plate or forming a large number of hat-shaped irregularities is known. No examples have been applied.

FIG. 1 is a perspective view of a composite metal vibration-damping plate of the present invention. FIG. 1 (a) is a composite metal vibration-damping plate in which an auxiliary metal plate is joined to the upper and lower surfaces of a main metal plate, and FIG. It is a figure which shows the composite metal vibration suppression flat plate which the auxiliary | assistant metal flat plate joined to the upper part and the lower part of the corrugated sheet of the main metal plate.

FIG. 2 is a cross-sectional view showing an example of a forming apparatus for manufacturing the composite metal vibration-damping plate of the present invention.

In the first invention, as shown in FIG. 1 (a), a main metal plate 1 and two auxiliary metal plates 2 are formed into a corrugated shape,
Each is a composite metal vibration-damping plate M1 that is joined by the point joints 3. As shown in FIG. 2, the main metal plate 1 is sent from the pay-off reel 4 and the two auxiliary metal plates 2 are sent from the two pay-off reels 4a. Thereafter, for example, the corrugated sheet is formed into a corrugated shape by a grooved roll forming apparatus 6 provided with grooves in the longitudinal direction, and the peaks or valleys of the combined corrugated sheet are spot-welded by a point welder 7.

According to a second aspect of the present invention, two flat auxiliary metal plates 2-1 are connected to a corrugated main metal plate 1 by a point joint 3 on the upper and lower parts of the main metal plate 1 as shown in FIG. This is a combined composite metal damping flat plate M2. This composite metal vibration-damping flat plate M2 is formed into a corrugated shape by a grooved roll forming device 5 having a groove in the longitudinal direction as shown in FIG. 2, and the formed corrugated plate is formed into two flat plates. It is manufactured by sandwiching between the auxiliary metal plates 2-1 and joining them at a point.

Next, the bending rigidity will be described.

FIGS. 4A and 4B are diagrams for explaining a method of calculating the bending stiffness of a flat plate and a corrugated plate. FIG. 4A is a diagram showing a case of a flat plate, and FIG. 4B is a diagram showing a case of a corrugated plate. Thickness h, width bo,
The bending stiffness D of a flat plate having a length a is represented by the following equation (1).

[0019]

(Equation 1)

Here, E represents the modulus of longitudinal elasticity, and ν represents the Poisson's ratio.

On the other hand, the bending stiffness D ₁ of the corrugated sheet as shown in FIG. 1 (a) is represented by a curve with a pitch length of b and a wavelength of one waveform as shown in FIG. 4 (b). Assuming that the length along the line is bw, the direction perpendicular to the wave shape is represented by the following equation (2).

[0022]

(Equation 2)

Here, I ₁ represents a section modulus.

When the bending rigidity D of the flat plate and the bending rigidity D ₁ of the corrugated plate are compared,

[0025]

(Equation 3)

Thus, it can be seen that the bending rigidity of the corrugated sheet is larger.

FIG. 5 is a diagram showing the relationship between the waveform height and the rigidity ratio. From the same figure, the ratio D ₁ / D of the bending stiffness with respect to the flat plate when the thickness h and the pitch length b of the waveform are constant (50 mm and 100 mm) and the height b _h of the waveform is changed is shown. FIG. From the figure, it can be seen that the greater the wave height b _h , the greater the ratio of the bending stiffness of the corrugated sheet to the bending stiffness of the flat sheet, D ₁ / D
It can be seen that can be increased.

FIG. 6 is a diagram showing the relationship between the equivalent plate thickness ratio and the wave height when the rigidity is made equal. The figure, when changing the height b _h of the waveform pitch length b of the plate thickness h and the waveform is constant (50mm and 100 mm), the thickness of the flat plate of equal stiffness and height b _h of the wave h _a (called equivalent plate thickness) and plate thickness h
FIG. From the figure, it is possible to increase the equivalent plate thickness h _a Increasing the height b _h of the wave.

[0029]

[Example] A steel coil (carbon steel JIS SPHC) for a main metal plate having a width of 1000 mm and a thickness of 2 mm and a steel coil (carbon steel JIS SPHC) for two auxiliary metal plates having a width of 1000 mm and a thickness of 0.7 mm 3), a composite metal vibration-damping plate (width: 1000 mm, length: 1000 mm, waveforms are shown in Table 1) of the first invention was manufactured by using a forming apparatus as shown in FIG. Further, a steel sheet coil for a main metal sheet is formed into a corrugated sheet by a forming device, the corrugated sheet is sandwiched between two steel sheets for an auxiliary metal sheet, and joined by spot welding.
The invention is a composite metal vibration damping flat plate (width 1000mm, length 1000mm,
The waveforms are shown in Table 1). As a comparative example, plate width 10
00mm, 2mm thick steel plate for main metal plate and two 1000mm wide, 0.7mm thick auxiliary metal plate steel plates on both sides of main metal plate, spot welding at 250mm intervals To produce a composite metal damping plate as shown in FIG.

[0030]

[Table 1]

FIG. 7 is a perspective view showing the state of the vibration test. In the vibration test, as shown in the figure, both ends in the longitudinal direction of the specimen T are fixed by the support plate 8, and the vibrator 10 is arranged at the center of the specimen T, and the vibration reaches a steady state. After that, the excitation was stopped, and the subsequent change in the displacement of the steel plate at the center was measured by the displacement meter 11 in a non-contact manner. The logarithmic decay rate was determined from the output waveform of the displacement meter and converted to a damping ratio. The bending rigidity was evaluated by a value obtained by dividing the maximum displacement amount when a load was applied by the weight per unit area.

Table 1 shows the relationship among the weight per unit area, the bending stiffness per unit weight, the damping ratio, and the equivalent sheet thickness ratio (equivalent sheet thickness / actual sheet thickness) obtained in these tests.

As is clear from Table 1, the test pieces 1 to 7 of the invention examples have the maximum displacement per unit weight of 0.00045 to 0.00045.
049, which is about 1/110 to 1/1 of the test pieces 8 and 9 of the comparative example.
It is 10. Further, the attenuation rates of the test pieces 1 to 7 are 0.020 to 0.048.
This is comparable to the test piece 8, but is significantly improved compared to the test piece 9.

[0034]

The composite metal vibration damping plate of the present invention has a high bending rigidity and a high damping rate because the superposed plates are corrugated and intermittently joined. Moreover,
Since no resin is used, welding can be performed, so that it can be used for structural members.

[Brief description of the drawings]

FIG. 1 is a perspective view of a composite metal vibration damping plate of the present invention, and (a).
Is a composite metal vibration-damping plate in which auxiliary metal plates are joined to the upper and lower surfaces of the main metal plate, and (b) is a composite metal vibration-damping plate in which auxiliary metal plates are joined to the upper and lower portions of the main metal plate. FIG.

FIG. 2 is a cross-sectional view illustrating an example of a forming apparatus for manufacturing the composite metal vibration-damping plate of the present invention.

FIG. 3 is a perspective view showing an example of a conventional composite metal damping plate.

4A and 4B are diagrams for explaining a method of calculating bending stiffness of a flat plate and a corrugated plate, wherein FIG. 4A is a diagram illustrating a case of a flat plate, and FIG.

FIG. 5 is a diagram showing a relationship between a waveform height and a rigidity ratio.

FIG. 6 is a diagram showing a relationship between an equivalent plate thickness ratio and a wave height when rigidity is made equal.

FIG. 7 is a perspective view showing a situation of a vibration test.

[Explanation of symbols]

 1. Main metal plate 2,2-1. Auxiliary metal plate 3. Joint 4. Payoff reel 5. Pinch roll 6. 6. Grooved roll forming machine Spot welding machine M1, M2, M3. Composite metal damping plate

Claims (2)

[Claims] 1. A composite metal vibration damping plate comprising a corrugated plate in which auxiliary metal plates are intermittently joined to upper and lower surfaces of a main metal plate. 2. A composite metal vibration-damping flat plate, wherein the main metal plate is a corrugated plate, and auxiliary metal flat plates are intermittently joined to upper and lower portions of the corrugated plate.