JPS6336938B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to vibration damping steel materials.

(Prior Art) Metal materials used for machine parts, building parts, etc. are selected mainly based on mechanical strength as the most important performance. However, recently there has been increased interest in vibration and noise, and there has been a demand for steel materials with excellent vibration performance. As an example, in thin steel sheets, 0.3
A composite steel plate in which a synthetic resin material with a thickness of 0.03 to 0.5 mm is sandwiched between two steel plates with a thickness of ~3.5 mm has been developed, and is used in automobile oil pans, etc.
Its vibration damping function is highly evaluated.

(Problems to be Solved by the Invention) On the other hand, steel materials such as medium plates and thick plates, and cast iron materials such as square materials, mold materials, processed materials, etc., are mainly required to have strength and rigidity, but none have a large vibration damping effect. By the way, the cast iron material is generally known as a material that has a relatively large vibration damping effect, but it has a problem that it has low strength and cannot be used as a plate material.

Therefore, an object of the present invention is to provide a steel material that has high strength, is strong against deflection (large moment of inertia of area), is lightweight, and has a large vibration damping effect.

(Means for Solving the Problems) As a means for achieving the above-mentioned object, the present invention provides a pair of vertically striped steel materials having one side flat and the other side having uneven portions parallel to the longitudinal direction. We adopted a configuration in which they are placed facing each other and the gap between them is filled with damping material.

(Example) Examples of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is an end view of a longitudinally striped steel material 1 used in the present invention, viewed from the longitudinal direction. It has uneven parts. In this invention, Pituchi p
= 10 to 20 mm, height of convex portion 4 b = 2 to 10 mm, ground thickness a
= 1.6 to 10 mm, and the total thickness c = 3.6 to 20 mm is used.

FIG. 2 is a cross-sectional view showing the first embodiment of the damping steel material according to the present invention, in which two pieces (1
pair), the convex parts 4 of the two steel sheets are in the same position,
In addition, the convex portions 4 and 4 are in direct contact with each other,
A damping material 7 is filled in a gap 6 formed between each of the recesses 5, 5. Examples of the damping material 7 include synthetic resins, organic materials such as rubber, graphite materials such as flexible graphite, mortar, and the like.

The synthetic resin as the organic material of the damping material 7 is:
Viscoelastic resin, epoxy, phenol, polyethylene, etc. are preferably used, and those with high adhesive strength to the two steel materials 1 are preferred, and rubber materials require elasticity and relatively rigidity. Select the material to be used depending on the case. For example, when elasticity is required, natural rubber (NR) and styrene-butadiene rubber (SBR) are used, and when elasticity is not required, nitrile rubber (NBR) and fluorine rubber (FKM) are used. Something that improves adhesive strength is needed.

The method for filling the organic material is to fill the gap 6 between the two steel materials 1 under high pressure, or apply or adhere the organic material to the uneven portions of one steel material 1, and then apply the organic material to the uneven portions of the other steel material. It is also possible to place the concavo-convex portion of No. 1 and press-bond it. Next, two pieces of steel facing each other 1,1
The side surfaces and contact surfaces may be integrated by spot welding or line welding.

The graphite-based material of the damping material 7 is a flexible graphite sheet (thickness 0.2 to 1.5 mm, high purity graphite plate with ash content of 0.5% or less: trade name "Permaf Oil, manufactured by Toyo Tanso Co., Ltd.") or powder. A material made by compression molding graphite with two sheets of steel and firing it is used. Alternatively, coal tar or the like may be directly filled between the two steel sheets. A flexible graphite sheet or one filled with calcined graphite can withstand use in a high temperature range and is more economical than the one filled with the above-mentioned organic material.

In the filling method described above, a flexible graphite sheet may be sandwiched between the gap 6 between the two steel materials 1, 1 and bonded with an adhesive. Alternatively, a graphite-based material may be applied or adhered to the uneven portions of one steel material 1, and the uneven portions of the other steel material 1 may be placed thereon and pressed together, and then fired.

Furthermore, the mortar for the vibration damping material 7 is preferably a mixture of cement and fine grained sand, which has a large adhesion tolerance to the two steel materials 1, 1. At this time, it is not preferable to use coarse-grained jiyari or the like.

Those filled with mortar are cheaper than those filled with the above-mentioned organic materials, and can withstand use under relatively high temperature conditions.

FIG. 3 shows a second embodiment of the present invention, in which the protrusions 4, 4 of the two steel materials 1, 1 are in the same position, but there is also a gap between the protrusions 4, 4 of each steel material 1, 1. This gap is also filled with damping material 7.

FIG. 4 shows a third embodiment of the present invention, in which the convex portion 4 of one steel material 1 and the concave portion 5 of the other steel material 1 match,
That is, the top of the convex portion 4 and the bottom of the concave portion 5 are in direct contact with each other, and the gap 6 formed by the convex portion 4 and the concave portion 5 is filled with damping material 7.

FIG. 5 shows a fourth embodiment of the present invention, and is an external perspective view thereof. This is because the convex part 4 of one steel material 1 corresponds to the concave part 5 of the other steel material 1, but a gap is formed without contacting each other in all parts, and a damping material 7 is formed in this gap. Indicates one filled with

Note that FIGS. 1 and 2 illustrate examples in which the height b of the convex portion 4 is small, and FIGS. 3 to 5 illustrate examples in which the height b is large. In order to reduce the filling amount, it may be changed appropriately as shown in FIGS. 4 and 5, and the ratio of the ground thickness a to the height b of the convex portion 4 may be selected depending on the intended use.

Among the above-mentioned embodiments, in FIGS. 2 and 4, two steel sheets are in direct contact with each other, and although they are strong in compressive strength from above and below, their vibration damping effect is poor. Therefore, the combined thickness of the two steel sheets t=2c becomes thinner. In Figures 3 and 5, all the gaps between the two steel sheets are filled with damping material 7, so t=2c+d and t=a+c
+d, which makes it thicker but has a greater vibration damping effect.

In either case, it is lighter than a general steel material with the same thickness t, and has a large vibration effect. Furthermore, the moment of inertia of the steel material in the direction of the longitudinal stripes is 1.2 to 2 times that of steel material of the same thickness, making it a composite material that is extremely resistant to deflection.

The thickness of d in Figures 3 and 5 may vary depending on the application.
Select around 0.05~10mm.

Hereinafter, further specific examples of the present invention will be explained.

Specific example 1 Earth pressure: a = 4.5 mm Convex height: b = 2.0 mm Vertical striped steel material, Pitch: p = 10 mm As shown in Figure 3, the gaps are filled with epoxy resin and flexible graphite. The sheet was filled with mortar, and d = 0.3 mm. The thickness of this invention steel material was 13.3 mm. When the damping effect of the steel material of the present invention was compared with that of a steel material of the same thickness, the effect of the steel material of the present invention was extremely large.

(Loss coefficient η) Ordinary steel 1×10 ^-3 Invention steel 1.5 to 5× ^{10 -1} 0.8 to 1.2×10 ^-1 0.5 to 2.0×10 ^-1 Specific example 2 Ground thickness: a=1.6 mm Height of convex part Vertical striped steel materials with a width of 2.0 mm and a pitch of 20 mm were used, and the gaps were filled with nitrile rubber, flexible graphite sheets, and mortar, facing each other as shown in Figure 4. The thickness of this invention steel material is 5.2 mm,
The damping effect was greater than that of steel of the same thickness.

(Loss coefficient η) Ordinary steel 1×10 ^-3 Steel of the present invention 1 to 3×10 ^-1 0.5 to 1.5×10 ^-1 0.1 to 1.0×10 ^-1 (Effect of the invention) The damping steel according to the present invention has the following properties: It has the characteristics of high strength, resistance to deflection, heat insulation, light weight, and large vibration damping effect, such as structural members that require vibration prevention, transportation equipment parts such as motor vehicles, power room floors, bridge members, etc. In addition to being used for materials that require the same strength as conventional thick plates and medium plates, they can also be used as members that require weight reduction.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a longitudinal end view of the longitudinal striped steel material, which is the main component of the present invention, and FIGS.
3 shows cross-sectional views of examples, respectively. 1... Vertical striped steel material, 2... One side, 3... Other side, 4
... Convex portion, 5... Concave portion, 6... Gap, 7... Damping material.

Claims (1)

[Claims] 1. A pair of vertically striped steel materials having one side flat and the other side having unevenness parallel to the vertical direction are arranged with the unevenness facing each other, and the gap between them is filled with a damping material. A vibration-damping steel material that is characterized by: 2. The vibration-damping steel material according to claim 1, wherein the opposing convex portions of the opposing longitudinal striped steel materials are in an opposing shape. 3. The vibration-damping steel material according to claim 1, wherein the opposing convex portions of the opposing longitudinal striped steel materials are arranged opposite to each other with a gap interposed therebetween. 4. The damping steel material according to claim 1, characterized in that the tops of the opposing convex portions and the bottoms of the concave portions of the opposing longitudinal striped steel materials are in contact with each other, and a gap is provided between the uneven portions. . 5. The damping steel material according to claim 1, wherein the opposing convex portions and concave portions of the opposing longitudinal striped steel materials are disposed opposite to each other with a gap interposed therebetween without contacting each other. 6. Claims 1 to 5, characterized in that the damping material filled in the gap is an organic material such as a synthetic resin or rubber, a graphite-based material such as a flexible graphite sheet, or mortar. The damping steel material described in one selected from.