JPS6391240A - Vibration-damping laminated metallic plate - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a damping plate used in panel parts of automobiles and the like to prevent the transmission of noise and vibration, and in particular, relates to a vibration damping plate that is used in panel parts of automobiles and the like to prevent the transmission of noise and vibration. This invention relates to vibration-damping laminated metal plates that are laminated.

Conventional technology Recently, the purpose of preventing the transmission of noise and vibration to the dash board that separates the engine room and the inside of the car, or the engine oil pan, etc., has been developed.
Vibration-damping laminated steel plates, which are laminated steel plates and viscoelastic resin, have come into use.

The most common conventional vibration-damping laminated steel plate is, for example, Figure 1 on page 467 of "31st Edition Steel Handbook Volume 4 Secondary Processing, Surface Treatment, Heat Treatment, Welding" (published by Maruzen Co., Ltd.)
1.44, it has a restrained three-layer structure in which a viscoelastic resin layer is interposed as an intermediate layer between two steel plates. In such vibration-damping laminated steel plates, the viscoelastic resin layer, which is the intermediate layer, is restrained by the steel plates on both sides, and vibrations are attenuated by viscoelastic hysteresis caused by shear deformation of the viscoelastic resin, preventing the transmission of noise and vibrations. Ru.

In addition, in JP-A No. 60-253536, a resin plate (hard one) is arranged in the center, and viscoelastic resin is used on both the front and back sides, mainly for the purpose of simultaneously obtaining both lightness and vibration damping properties. A vibration-damping laminated metal plate having a five-layer structure in which metal plates such as steel plates are arranged between layers has also been proposed. With this proposal, as well as with the three-layer structure described above, a vibration damping function can be obtained by the viscoelastic resin layer. However, in this proposed laminated structure, the same type of viscoelastic resin is used on both the front and back surfaces of the central resin plate.

Problems to be Solved by the Invention In the conventional vibration-damping laminated steel plate with a general restraint type three-layer structure, there is only one layer of viscoelastic resin, and the above-mentioned proposal 5
Even in the case of a layered structure, there are two viscoelastic resin layers, but the same viscoelastic resin is used for both layers. In such conventional vibration-damping laminated steel plates, the vibration damping characteristics of the vibration-damping laminated steel plates have temperature dependence and frequency dependence, depending on the characteristics of the viscoelastic resin used. In other words, the viscoelastic resin generally used in this type of damping steel plate has a limited temperature range in which it exhibits viscoelasticity that exhibits excellent damping effects, and the vibration energy loss coefficient and temperature In this relationship, the peak temperature at which the loss coefficient is maximum is determined by the resin used. Also, regarding the relationship between vibration energy loss coefficient and vibration frequency, depending on the resin, there may be a peak frequency at which the loss coefficient is maximum, and depending on the resin, the loss coefficient may be large in the high frequency range, or conversely, in the low frequency range. They often exhibit frequency dependence, with some having large loss coefficients.

As mentioned above, conventional vibration damping laminated steel plates use one layer or one type of viscoelastic resin, so the vibration damping characteristics have temperature dependence and frequency dependence due to the characteristics of the viscoelastic resin. As such, the effective temperature range and frequency range were limited. Therefore, when conventional vibration-damping laminated steel plates are actually used in automobile panel parts, etc., there is the inconvenience of having to appropriately select and use the type according to the temperature of the part where it will be used and the frequency in particular that is to be damped. In addition, when used in areas where temperature changes are large, there is a problem in that good vibration damping characteristics cannot often be exhibited over the entire temperature range. Also, depending on the location where the damping laminated steel plate is used, one side of the vibration-damping laminated steel plate is often hot and the other side is cold. The vibration-damping laminated steel plates of 2007 were not able to cope well with this problem, and often failed to exhibit sufficient vibration-damping effects.

This invention was made against the background of the above-mentioned circumstances, and has weakened the dependence on temperature and frequency compared to conventional vibration-damping laminated steel plates, expanded the temperature range, frequency range, etc. that are effective in terms of vibration-damping function, and This increases the versatility of the vibration-damping laminated metal plate, and makes it possible to effectively exert its vibration-damping function over the entire temperature range, even in areas where temperature changes are large, and where there is a temperature difference between the inside and outside. To provide a vibration-damping laminated metal plate that can exhibit sufficient vibration-damping function even when used for.

Means for Solving the Problems The damping laminated steel plate of the present invention basically has a five-layer structure with two viscoelastic resin layers.

In other words, a core plate made of a highly rigid material such as a metal plate or hard resin is placed in the center, viscoelastic resin layers are placed on both the front and back sides of the core plate, and a steel plate or the like is placed on the outside of each viscoelastic resin layer. Metal plates are arranged to create a five-layer structure as a whole. The most important thing about the vibration damping laminated metal plate of this invention is that viscoelastic resins having different vibration damping properties are used for the elastic resin layers on both the front and back sides of the core plate, that is, the two viscoelastic resin layers in total. The above-mentioned problem is solved by making the vibration damping characteristics of the two layers of viscoelastic resin different in this way.

Here, as an aspect of making the vibration damping characteristics of the two viscoelastic resin layers different, first, it is possible to use viscoelastic resins having different vibration damping characteristics with respect to temperature. Specifically, it is possible to use viscoelastic resins whose loss coefficients have different peak temperatures in the vibrational energy loss coefficient-temperature relationship, or to use viscoelastic resins whose loss coefficients change at different temperatures with respect to the vibrational energy loss coefficient-temperature relationship. Different viscoelastic resins may be used.

Another aspect of making the vibration damping characteristics of the two viscoelastic resin layers different is to use viscoelastic resins that have different vibration damping characteristics with respect to vibration frequencies. Specifically, use viscoelastic resins with different frequencies at which the loss coefficients are maximum in the relationship between vibration energy loss coefficient and frequency, or use viscoelastic resins with different degrees of change in loss coefficients with respect to frequency. There are many things.

Further, as for the embodiment of the metal plates used on both the front and back sides of the vibration-damping laminated metal plate of the present invention, one or both of the metal plates may be subjected to a surface treatment for anticorrosion or rust prevention. surface-treated steel sheets can be used.

Further, as the viscoelastic resin layer in the present invention, it is desirable to use a layer mixed with a conductive substance to impart conductivity.

Furthermore, as the core plate made of a high-rigidity material placed in the center, a laminate plate with metal plates laminated on both sides of a hard synthetic resin plate can be used. It is also possible to use a material that has been given conductivity.

Function: In the vibration-damping laminated metal plate of this invention, the central core plate is
It mainly provides the necessary rigidity to vibration-damping laminated metal plates used in panels, etc., and the two viscoelastic resin layers on both sides of the core plate have viscoelastic hysteresis while being restrained by the metal plate on the outer surface. It absorbs vibrations and exhibits a damping function. The metal plate on each surface has a restraining function and also provides surface functions such as surface hardness necessary for panel parts and the like.

In particular, in the vibration-damping laminated metal plate of the present invention, the two viscoelastic resin layers disposed on both sides of the central core plate made of a high-rigidity material have mutually different vibration damping characteristics. Therefore, the vibration damping characteristics of the laminated metal plate as a whole are a combination of the different vibration damping characteristics of the two viscoelastic resin layers, and therefore the dependence of the vibration damping function on temperature and frequency is different from that of a single viscoelastic resin. It is much smaller than the conventional vibration damping laminated metal plate used.

For example, if viscoelastic resins having different vibration damping characteristics with respect to temperature are used for the two viscoelastic resin layers, the vibration damping function can be exhibited over a wide temperature range. Specifically, in viscoelastic resins, there is generally a peak temperature at which the loss coefficient is maximum in the relationship between the vibration energy loss coefficient and temperature, and the damping function can only be obtained in a temperature range on either side of that peak temperature. However, by using two types of viscoelastic resins with different peak temperatures, the vibration damping function can be achieved from the effective temperature range of one viscoelastic resin to the effective temperature range of the other viscoelastic resin. It becomes possible to obtain. In addition, since the two viscoelastic resin layers are located on opposite sides of the core plate, it is possible to create a gap between a space with a high temperature atmosphere and a space with a relatively low temperature atmosphere, such as a dash board that partitions the engine room and the inside of a train. When using the vibration-damping laminated metal plate of the present invention in the portion interposed between The vibration-damping laminated metal plate is arranged so that the layer side is located on the low-temperature side, and the side of the viscoelastic resin layer made of a viscoelastic resin with a relatively high peak temperature (that is, a resin whose damping function is effective in a high-temperature range) is located on the high-temperature side. If arranged, the viscoelastic resin layer with a relatively low peak temperature will function effectively on the low temperature side, and the viscoelastic resin layer with a relatively high peak temperature will function effectively on the high temperature side. The vibration damping laminated metal plate as a whole exhibits an effective and sufficient vibration damping function. In addition, even if the peak temperatures in the relationship between vibration energy loss coefficient and temperature are the same or close to each other, two types of viscoelastic resins have different degrees of change in loss coefficient with respect to temperature. If you use a viscoelastic resin with a small curve dispersion and a narrow effective temperature range, and a viscoelastic resin whose loss coefficient curve has a large dispersion and a wide effective temperature range, although the peak value of the loss coefficient is not so large, It is possible to obtain a vibration-damping laminated metal plate that has a large peak value of loss coefficient and is effective over a wide temperature range.

On the other hand, if viscoelastic resins having different vibration damping characteristics with respect to vibration frequencies are used for the two viscoelastic resin layers, the damping function can be exhibited over a wide frequency range. Specifically, in the relationship between vibration energy loss coefficient and frequency, viscoelastic resins may have a frequency where the loss coefficient is maximum, and viscoelastic resins may have different frequencies where the loss coefficient is maximum at the required frequency. By using the elastic side resin, it is possible to obtain a high vibration damping function over a wide range from a frequency range where one viscoelastic resin has a high loss coefficient to a frequency range where the other viscoelastic resin has a high loss coefficient. In addition, in the relationship between vibration energy loss coefficient and frequency, viscoelastic resins have different degrees of change in the loss coefficient with respect to frequency, for example, viscoelastic resins with a peak frequency that is low, and viscoelastic resins with almost no peak frequency (i.e., a wide range). By using a viscoelastic resin that is effective in a frequency range, it is possible to create a vibration damping laminate that has a particularly large damping function near the peak frequency of one of the resins that has a peak, and also exhibits an effective damping function over a wide frequency range. You can get metal plates.

Moreover, if a surface-treated steel plate subjected to surface treatment for rust prevention or corrosion prevention is used as at least one of the outer metal plates, a vibration-damping laminated metal plate with excellent rust resistance and corrosion resistance can be obtained.

Furthermore, if a viscoelastic resin mixed with a conductive substance to give conductivity is used as the viscoelastic resin layer, electric resistance welding such as spot welding can be easily performed.

In addition, if a laminate consisting of a hard resin plate and metal plates arranged on both sides is used as the core plate, it can be made lighter than when a single metal plate is used as the core plate. A laminated metal plate can be obtained. Even in this case, if a resin that has been mixed with a conductive substance to give conductivity is used as the hard resin plate that forms part of the core plate, it becomes possible to easily perform electric resistance welding such as spot welding. .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a specific structure of a vibration-damping laminated metal plate according to the present invention. In FIG. 1, reference numeral 1 denotes a core plate made of a highly rigid material, and viscoelastic resin layers 2.3 made of viscoelastic resins having different vibration damping properties are arranged on both the front and back surfaces of the core plate 1. A metal plate 4.5 is arranged on the outer surface of each viscoelastic resin layer 2.3.

Here, as the surface metal plate 4.5, for example, a steel plate, an aluminum alloy plate, and various other materials depending on the purpose of use can be used. When using steel plates, any steel plate can be used, such as cold-rolled steel plates, hot-rolled steel plates, and stainless steel plates. In particular, surface-treated steel plates that have been surface-treated such as galvanized to prevent rust and corrosion. If this is used for one or both of the metal plates, the durability of the vibration-damping laminated metal plate can be improved. When a surface-treated steel plate is used as the metal plate 4.5, the steel plates may be laminated using previously surface-treated steel plates, or surface treatment such as electroplating may be applied after lamination.

In addition, as the viscoelastic resin constituting the viscoelastic resin layer 2.3, it is sufficient to use a resin that does not exhibit viscoelasticity at the operating temperature of the vibration damping laminated metal plate, and the specific type thereof is not particularly limited, but for example, Polyolefin resins (polyethylene, polypropylene, etc.), vinyl acetate resins (vinyl acetate polymer, vinyl acetate-dibutyl maleate copolymer, vinyl acetate-acrylic acid ester copolymer, etc.), rubber, polyisobutylene, etc. are used. be able to.

Here, in order to make the vibration damping characteristics of the two viscoelastic resin layers different, it is necessary to use different resins, or when using a mixture of two or more resins, change the blending ratio, or change the blending ratio of the blended resins. All you have to do is change one part of it. Further, when imparting conductivity to the viscoelastic resin M2.3, fine metal particles such as iron, copper, aluminum, stainless steel, nickel, etc., or graphite powder may be used as the conductive substance mixed in the viscoelastic resin. Note that the thickness of the viscoelastic resin layer 2.3 is not particularly limited, but it may normally be about 0.01 to 0.50°C.

As the highly rigid material constituting the core material 1, steel plates, aluminum alloy plates, other metal plates, various resin plates, etc. can be used. In particular, as shown in Figure 2,
The core plate 1 may be a laminate comprising a hard resin plate 1A made of a resin such as polypropylene or nylon, and thin metal plates 1B and 1G, such as thin steel plates, placed on each of the front and back sides. In this way, a laminate is used as the core plate 1, and the hard resin plate 1A of the core plate 1 is
When imparting conductivity to the resin, fine metal particles such as iron, copper, aluminum, stainless steel, nickel, etc. or graphite powder may be used as the conductive substance mixed in the resin.

The relationship between the thickness of the core plate 1 and the outer metal plate 4.5 is as follows in the example of FIG. However, it can be arbitrarily determined depending on the required characteristics, application, use area, etc. For example, tl = t2 = t3 as shown in Fig. 3, or as shown in Fig. 4. There are various modes, such as t1 = t2 < t3, as shown in Figure 5, tl = t3 > t2, as shown in Figure 6, and tl = t2 > t3, as shown in Figure 6. .

Example [Example 1] In a vibration-damping laminated metal plate with a five-layer structure as shown in FIG. A steel plate with a thickness of 0.4# is used, and one viscoelastic resin layer 2 has a peak temperature at which the loss coefficient is maximum in the relationship between vibration energy loss energy and temperature, as shown by the solid line in Figure 7. Viscoelastic resin S at 20℃
1, and as the other viscoelastic resin layer 3, a viscoelastic resin S2 having a peak temperature of 60° C. at which the loss coefficient is maximum was used.

The thickness of each viscoelastic resin layer 2.3 was set to 0.05 mm.

The loss coefficient-temperature characteristics of the damping laminated metal plate as a whole in Example 1 are as shown by the broken line in FIG.
The peak temperature was at 60°C, and the loss coefficient was high over a wide temperature range.

In addition to having a good vibration damping function over a wide temperature range, such a vibration damping laminated metal plate has a relatively low peak temperature (20 ℃), and the peak temperature of the other viscoelastic resin layer 3 is high temperature (60℃), so it can be used in areas where the ambient temperature is different on both sides, such as the dash panel of a car, so that it can be used on the lower temperature side (e.g. Viscoelastic resin layer 2 on the conductor side)
If the viscoelastic resin layer 3 is placed on the high temperature side (for example, on the engine room side), it is possible to exhibit an extremely excellent vibration damping function.

[Example 2] The laminated structure itself was the same as in Example 1, and one of the viscoelastic resin layers 2 had a peak temperature of 40% in the relationship between vibration energy loss coefficient and temperature, as shown by the solid line in FIG. ℃
The viscoelastic resin S3, which has a high peak value of loss coefficient,
As the other viscoelastic resin layer 3, a viscoelastic resin S4 was used, which has a peak temperature near 40°C but has a low peak value of loss coefficient and is effective over a wide temperature range.

The loss coefficient-temperature characteristics of the damping laminated metal plate as a whole in Example 2 are as shown by the broken line in FIG.
It was confirmed that the loss coefficient peaked at a temperature of about 100 mL, and that the damping function was exhibited over a wide temperature range.

[Example 3] The laminated structure itself was the same as in Example 1, and one of the viscoelastic resin layers 2 was made in the 250 Hz band (250 Hz band) in the relationship between the loss coefficient of vibration energy and the frequency, as shown by the solid line in Fig. 9.
The viscoelastic resin S5 exhibits a maximum loss coefficient at 1/3 octave band center frequency (the same applies hereinafter), and the other viscoelastic resin layer 3 is a viscoelastic resin S5 that exhibits a maximum loss coefficient at 450 Hz band. Elastic resin S6 was used.

The loss coefficient-frequency characteristics of the damping laminated metal plate as a whole in Example 3 show a high loss coefficient over a wide frequency range, as shown by the broken line in Figure 9, and therefore exhibit excellent control over a wide frequency range. It can perform the shaking function.

[Example 4] The laminated structure itself was the same as in Example 1, and the viscoelastic resin layer 2 on the negative side had a value of 315H in terms of the relationship between the loss coefficient of vibration energy and the frequency, as shown by the solid line in Fig. 10.
Viscoelastic resin S7 exhibiting a loss coefficient peak in two bands,
As the other viscoelastic resin layer 3, a viscoelastic resin S8 whose loss coefficient changes little with respect to frequency was used.

The loss coefficient-frequency characteristics of the damping laminated steel plate as a whole in Example 4 are as shown by the broken line in FIG.
It had a peak in the 15H2 band and showed a relatively high loss coefficient over a wide frequency range. Such a vibration-damping laminated metal plate is effective when it is desired to mainly damp vibrations of a specific frequency, but also to some extent vibrations of different frequencies.

Effects of the Invention As is clear from the above examples, in the vibration-damping laminated metal plate of the present invention, two viscoelastic resin layers are provided sandwiching the central core plate, and the outer metal plate is also included. Overall 5
It has a layered structure, and the two viscoelastic resin layers have different vibration damping characteristics, so the dependence of the vibration damping function on temperature, frequency, etc. is weaker than that of conventional vibration damping laminated metal plates. Expanding the temperature range, frequency range, etc. that are effective for vibration damping function increases the versatility of the vibration damping laminated metal plate, and also provides effective vibration damping function even when used in areas with large changes in temperature etc. In addition, the properties of the viscoelastic resin can be selected appropriately according to the usage conditions, especially when used in areas where there is a temperature difference between the inside and outside atmospheres, under various usage conditions. Therefore, sufficient vibration damping function can be exhibited.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the structure of the damping laminated metal plate of the present invention, FIG. 2 is a sectional view showing an example of the structure of the vibration damping metal plate of the invention, and FIGS. 3 to 6 7 and 8 are cross-sectional views showing still other examples of the structure of the damping metal plate of the present invention, respectively, FIGS. 7 and 8 are correlation diagrams showing the relationship between vibration energy loss coefficient and temperature, and FIG. 1 and 10 are correlation diagrams showing the relationship between the loss coefficient of vibration energy and the vibration frequency, respectively. 1... Core plate, 2.3... Viscoelastic resin layer, 4.5
...Metal plate. Applicant Toyota Motor Corporation Nippon Steel Corporation

Claims (11)

[Claims] (1) A structure in which viscoelastic resin layers are arranged on both the front and back surfaces of a core plate made of a highly rigid material, and a metal plate is arranged on the outer surface of each viscoelastic resin layer, and one surface of the core plate A vibration damping laminated metal plate characterized in that a viscoelastic resin layer on one side and a viscoelastic resin layer on the other side have different vibration damping characteristics. (2) The vibration-damping laminated metal plate according to claim 1, wherein viscoelastic resins having different vibration damping characteristics with respect to temperature are used as each of the viscoelastic resin layers. (3) The vibration damping according to claim 2, wherein the viscoelastic resin layers are made of viscoelastic resins that have different peak temperatures at which the loss coefficient in the relationship between vibration energy loss coefficient and temperature is the maximum. Laminated metal plate. (4) The damping according to claim 2, wherein each of the viscoelastic resin layers is made of a viscoelastic resin in which the degree of change in the loss coefficient with respect to temperature in the relationship between the vibration energy loss coefficient and temperature is different from each other. Laminated metal plate. (5) The vibration-damping laminated metal plate according to claim 1, wherein viscoelastic resins having different vibration damping characteristics with respect to vibration frequencies are used as each of the viscoelastic resin layers. (6) The vibration damping according to claim 5, wherein each viscoelastic resin layer is made of a viscoelastic resin having a maximum loss coefficient in the relationship between the vibration energy loss coefficient and the vibration frequency. Laminated metal plate. (7) The restraint according to claim 5, wherein each of the viscoelastic resin layers is made of a viscoelastic resin in which the degree of change in the loss coefficient with respect to frequency in the relationship between the loss coefficient of vibration energy and the vibration frequency is different from each other. Shake-laminated metal plate. (8) The vibration-damping laminated metal plate according to claim 1, wherein at least one of the metal plates is a surface-treated steel plate subjected to surface treatment for rust prevention or corrosion prevention. (9) The vibration-damping laminated metal plate according to claim 1, wherein each of the viscoelastic resin layers uses a viscoelastic resin mixed with a conductive substance to give conductivity. (10) As the core plate, a laminate plate in which metal plates are arranged on both the front and back surfaces of a hard resin plate is used.
Vibration-damping laminated metal plate as described in section. (11) The vibration-damping laminated metal plate according to claim 10, wherein the hard resin plate constituting a part of the core plate is made of a resin mixed with a conductive substance to give conductivity.