JPH0357638A - Damping metal plate - Google Patents

Abstract

PURPOSE:To make a lowering of clamping force hard to generate within a relatively wide temp. range without deteriorating damping capacity, in a damping metal plate wherein a viscoelastic high-molecular resin containing an inorg. filler in a uniformly dispersed state is laminated between two metal plates, by specifying the strength of a filler, the ratio of the diameter (d) of the filler before lamination and the thickness (t) of the resin after lamina tion and the amount of the filler in the resin. CONSTITUTION:In a damping metal plate, the strength of a filler is 10 -250 kgf/mm<2>, the ratio of the diameter of the filler before lamination and the thickness of a resin after lamina tion is 1.2 - 2.5 and the amount of the filler in the resin is 1 - 5 vol. %. When the strength of the filler is below 10kgf/mm<2>, the difference with resin strength becomes small and the effect for the improvemnt in creep strength or compression resistance becomes insufficient and, when said strength exceeds 250 kgf/mm<2>, the filler becomes hard to deform at the time of lamination and lamination becomes impossible. When d/t is below 1.2, the effect for the improvement in compression resistance becomes insufficient and, when d/t exceeds 2.5, lamina tion becomes impossible. When the amount of the filler is below 1%, the effect for the improve ment in compression resistance becomes insufficient and, when said amount exceeds 5%, the bonding strength of the laminated layer an a metal plate and damping capacity are lowered.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a damping metal plate, and more particularly to a damping metal plate having vibration damping properties such as a damping steel plate used for soundproofing. Regarding the board.

(Prior art) In recent years, measures to reduce the noise generated by vibrations in various P1 machines and transportation systems have become an important issue, and as a countermeasure, metal plates with vibration damping properties, that is, vibration damping metal plates, have been introduced to the noise source. It's starting to be used.

For example, vibration-damping metal plates have been used in automobile oil pans, dash panels, hopper chutes, general-purpose engine covers, vibration reduction members of metal processing machines, and the like.

Such a vibration damping metal plate has a laminated structure and is composed of two or more metal plates and a viscoelastic polymer resin layer inserted between each of these metal plates to bond the metal plates. . That is, a viscoelastic polymer resin is laminated between metal plates. There are cases where there are two metal plates and cases where there are three or more metal plates. The function of the resin layer is to bond the metal plates and provide vibration damping performance. The above metal plates include steel plates, each with 1 heavy plating IJ anti-plate, and stainless steel! l2I {Anti, AI board,
Titanium plates, copper plates, and other non-ferrous metal R plates are used.

(Problem to be Solved by the Invention) However, in the conventional vibration-damping metal plates, the strength of the resin between the metal plates is lower than the strength of the metal plates, so the vibration-damping metal plates are tightened with bolts etc. There is a problem in that the tightening force of the bolts and the like decreases after the bolts and the like are assembled. This reduction in tightening force is an extremely important and serious problem because it can lead to engine oil leaks in oil pans, etc., and backlash (looseness) in tightening parts in other equipment. It should be noted that the tightening force reduction phenomenon is further accelerated as the temperature increases.

It has been reported that the reduction in tightening force mentioned above can be suppressed to 10% or less at room temperature by improving resin strength, but it has been raised that other measures are required when used at high temperatures. 6 However, no countermeasure technology has been proposed, and the current response is to periodically retighten.

Additionally, when conventional vibration-damping metal plates are used in circulation system equipment that operates at relatively high temperatures, there is a problem in that resin protrudes from the edges of the vibration-damping metal plates and enters the circulation system, causing equipment failure. There is a point.

The present invention has been made in view of these circumstances, and its purpose is to solve the above-mentioned problems of the conventional ones, and to be able to spread over a relatively wide range without deteriorating vibration damping performance. It is an object of the present invention to provide a vibration-damping metal plate that does not easily cause a decrease in tightening force in the temperature range of .

(Means for Solving the Problems) In order to achieve the above problems, the damping metal plate according to the present invention has the following precautions.

That is, the vibration-damping metal plate according to the first aspect is a vibration-damping metal plate in which a viscoelastic polymer resin containing an inorganic filler uniformly dispersed is laminated between two metal plates; The strength of the filler is 1O~250Kgf/+a+'', the ratio of the filler diameter before lamination to the resin thickness after lamination is 1.2~2.5, and the amount of filler in the resin is 1~5.
This is a vibration-damping metal plate characterized by a capacity of %. The damping metal plate according to the second claim is characterized in that the strength, diameter, and amount of the filler further satisfy the following formulas [1] and [2]. It is a board. 15≦(d/t-1)×σ1≦60111■50≦σ
rxc ≦250 ・・・・・・・・・ [2] However, in the above formulas [1] and [2] 2, d is the filler diameter before lamination), and t is the resin thickness after lamination (the diameter of the filler) ), σ1 is filler strength (Kgf/a+s+”),
C is a filler in citrus! (capacity %).

(Function) As a result of a detailed investigation into the cause of the decrease in the clamping force of the vibration-damping metal plates as described above, it was found that the decrease in the clamping force occurred due to the creep of the viscoelastic polymer resin laminated between the metal plates, and the decrease in the clamping force of the resin. It was found that increasing the creep strength can reduce the degree of decrease in tightening force. However, at high temperatures, the resin not only softens and has extremely low creep strength, but also deteriorates vibration damping performance, so there is a limit to the above-mentioned measures based on the creep strength of the resin, and it is a problem in a wide temperature range. It is impossible to solve the problem. The present invention was completed based on the results of investigating the cause of the decrease in the tightening force, and was completed through research from a different perspective than improving the creep strength of the resin, and it is possible to improve the creep strength of the entire vibration damping metal plate. , without degrading the damping performance.
This prevents the tightening force from decreasing over a wide temperature range.

That is, as explained above, the vibration-damping metal plate according to the present invention is a vibration-damping metal plate in which a viscoelastic polymer resin containing an inorganic filler uniformly dispersed is laminated between two metal plates. The strength of the filler is 10 to 250 Kgf/
mm", ratio of filler diameter before lamination (d) to resin thickness after lamination (1) (hereinafter referred to as d/t)
is set at 1.2 to 2.5.

Since the above d/L is larger than l, the diameter of the filler in the laminate layer made of the resin and filler in the damping metal plate can be equal to the thickness of the laminate layer. or,
The strength of the filler is extremely high compared to the strength of the resin. Therefore, the filler can develop a strong resistance to deformation of the vibration-damping metal plate in the compressive direction, such as when tightened with bolts, etc., and improves the compression resistance of the laconate layer. In other words, the creep strength of the entire damping metal plate can be improved.

Therefore, the tightening force of the damping metal plate is less likely to decrease. Furthermore, if the filler is inorganic and has relatively high strength even at high temperatures, such as metal, it will be possible to prevent the tightening force from decreasing over a wide temperature range.

The reason why the filler strength is set to 10 to 250 Kgf/mm is that if it is less than 10 Kgf/ms, the difference with the resin strength will be small and the effect of improving the creep strength and compression resistance will not be sufficient, and if it is more than 250 Kgf/mm, This is because the filler becomes difficult to deform during lamination, making it impossible to laminate.The reason why the d/t is set to 1.2 to 2.5 is that if it is less than 1.2, the effect of improving compression resistance will be insufficient. This is because if it exceeds 2.5, it will not be possible to laminate.The reason why the filler amount is 1 to 5% is that if it is less than 1%, the compression resistance improvement effect will be insufficient, and if it exceeds 5%, the laminate layer will not be able to be laminated. This is because the adhesion strength between the filler and the metal plate and the vibration damping performance will decrease and become insufficient.We conducted a number of more detailed experiments regarding the strength, diameter, and amount of the filler. Within the range of the amount, these intensities, diameters and amounts are further determined by the hatched areas shown in FIGS. 1 and 2 (i.e.
Area A in FIG. It was found that adjusting to the range B) in Figure 2 would more reliably produce a damping metal plate with even higher levels of compression resistance. The above regions A and B both have the above filler strength. Within the range of diameter and amount, region A satisfies the following formula, and region B satisfies the following formula (■). Therefore, it is desirable that the strength, diameter, and amount of the filler be within a range that satisfies the following formulas [1] and [2]. 15≦(d/t-1)X
σC≦60...[1]50≦σ1×C≦250
−−−−−−−−− ■However, in the above and ■ formulas, d is the filler diameter before lamination (Pengichi), L is the resin thickness after lamination (open), and σ1 is the filler strength (Kgf/
am”), C indicates the amount of filler in the resin (volume %). In addition, d/t − 1 in the above formula corresponds to the oblateness of the filler before and after lamination. In such a vibration-damping metal plate, not only metal fillers but also non-metal fillers can be used.The filler is preferably granular or fibrous in shape.

As the viscoelastic polymer resin, resins commonly used for vibration-damping metal plates can be used. The thickness of the laminate layer is preferably 10 to 200μ, preferably 30 to 100μ.
Us is good. If it is less than 10 μm, the damping performance will decrease rapidly, and if it exceeds 200 μm, the shapeability of the damping metal plate during press working etc. will deteriorate. The type of metal for the vibration-damping metal plate is not particularly limited, and steel plates and the like can be used. The present invention provides a damping metal W comprising three or more metal plates and a resin layer.
This can also be applied to A plate.

(Example) Mitsu 10 Tojo iron powder. Stainless steel powder or flux powder (filler)
: 2.0% by volume of polyolefin resin uniformly dispersed in the plate thickness: 0.0% by volume. 8+wm aluminum killed steel plate 2
A large number of vibration-damping metal plates having a laminated layer thickness of 50 μm were obtained by laminating between the sheets. In addition, the filler strength is 32.
56Kgf for stainless steel powder, 210Kgf for flux powder
as''.The particle size of each filler is 45, 53, 6
It was changed to 7 levels: 3, 75, 96, 115, and 140μ. The vibration-damping metal plate was cut into 50 mm square pieces, a 6.5 m-Φ hole was drilled in the center of the cut material, and the material was tightened at room temperature with an axial force of 350 kgf using bolts as shown in Figure 3. 2 at 80°C, the temperature at which it exhibits the best vibration damping performance.
After holding for 4 hours, the axial force was measured and its rate of decrease (χ) was determined. In addition, the adhesive strength between the laminate layer and the metal plate was measured, and the percentage of the measured value relative to the adhesive strength when no filler was included, that is, the adhesive strength (χ) was determined. In Figure 3, (1) is a bolt, (2), (5), (6) is a washer, (3) is a damping steel plate, (4) is a prong, and (7) is a damping steel plate.
(8) shows a strain gauge for measuring axial force. The strain gauge (8) is equipped with a digital static strain meter (
9) is connected.

The relationship between the d/t and the axial force reduction rate (χ) is shown in the fourth column, and the relationship between the d/t and the adhesive strength (χ) is shown in the fifth column. In addition, in the 4th and 5th openings, the case where the filler is iron powder is indicated by a mark, the case where the filler is stainless steel powder is indicated by an x mark, and the case where the filler is a flux powder is indicated by a mark Δ.

As can be seen from FIG. 4, as d/t becomes smaller, the axial force decrease rate increases, and when it becomes less than 1.2 to 2.5, the decrease rate becomes about 10%.

As can be seen from FIG. 5, the adhesive strength (X) decreases as d/t increases, and in the case of filler iron powder, when d/t exceeds 2.5, the adhesive strength becomes 95% or less.

Laminated L Laminated by laminating polyolefin resin containing iron alloy powder or soft flux powder (filler) between two aluminum killed steel plates with a plate thickness of 0.8+am.Laminated layer thickness:
A large number of vibration damping metal plates with a thickness of 50 μm were obtained. The filler strength is 45Kgf/m for alloy iron powder and 121Kgf/m for soft flux powder.
It is m2. The amount of each filler is 1,2.3. 4, 5
．． It was changed into 6 steps of 6% by volume. d/t was set to 1.4 in all cases.

The same test as in Example 1 was conducted on the above vibration damping metal plate. Figure 6 shows the relationship between filler amount and axial force reduction rate, and Figure 7 shows the relationship between filler amount and adhesive strength (X). In addition, in Figures 6 and 7, the case where the filler is iron alloy powder is marked with
The case of soft flux powder is indicated by ▲. When the amount of filler becomes 1% by volume, the rate of decrease in axial force increases rapidly. As the amount of filler increases, the adhesive strength decreases, and in the case of iron alloy powder, when the amount exceeds 5% by volume, the adhesive strength decreases to 95% or less. (Effects of the Invention) According to the damping metal plate according to the present invention, the clamping force is less likely to decrease in a relatively wide temperature range without deteriorating the damping performance, and the edge of the damping metal plate It also makes it difficult for the resin to protrude from the parts. Therefore, problems such as a decrease in the clamping force of the damping metal plate and resin extrusion in equipment used at relatively high temperatures can be solved.

[Brief explanation of drawings]

Figures 1 and 2 show the strength of the filler that gives the damping metal plate a higher level of compression resistance. Range of diameter and amount (area A
, region B). In Fig. 1, d indicates the filler diameter before lamination, and t indicates the resin thickness after lamination. Figure 3 is. A side view showing the state of the bolt tightening test of the damping metal plate according to Examples 1 to 2,
FIG. 4 is a diagram showing the relationship between the ratio of the filler diameter before lamination to the resin thickness after lamination (d/t) and the axial force reduction rate (χ) according to Example 1, and FIG. Diagram 6 showing the relationship between the above (d/t) and adhesive strength (χ) according to Example 1.
The diagram is. FIG. 7 is a diagram showing the relationship between the filler amount and the axial force reduction rate according to Example 2, and FIG. 7 is a diagram showing the relationship between the filler amount and adhesive strength (X) according to Example 2. The adhesive strength (χ) in FIGS. 5 and 7 is the percentage of the adhesive strength of the filler-containing vibration-damping metal plate relative to the adhesive strength of the vibration-damping metal plate without filler. In the 4th to 7th ports, each mark distinguishes the type of filler used, ○ mark is iron powder, × mark is stainless steel powder. Δ mark is Flags powder,●
The mark indicates the case of alloy iron powder, and the ▲ mark indicates the case of soft Franks powder. (l) One volt (2) (5) (6) −
Washer (3) One vibration damping steel plate (4) One block (
7) One nut (8) One strain gauge (9) One digital static strain meter

Claims (2)

[Claims] (1) A vibration-damping metal plate formed by laminating a viscoelastic polymer resin containing an inorganic filler uniformly dispersed between two metal plates, the filler having a strength of 10 to 250 kg.
f/mm^2, the ratio of the filler diameter before lamination to the resin thickness after lamination is 1.2 to 2.5, and the amount of filler in the resin is 1 to 5% by volume. Shaking metal plate. (2) The strength, diameter and amount of the filler are further set as below [1
The damping metal plate according to claim 1, characterized in that the damping metal plate satisfies formulas [2] and [2]. 15≦(d/t-1)×σ_1≦60...[1]50
≦σ_1×C≦250...[2] However, in the above equations 1 and 2, d is the filler diameter before lamination (mm), t is the resin thickness after lamination (mm),
σ_1 represents the filler strength (Kgf/mm^2), and C represents the filler amount (volume %) in the resin.