JPS62113543A - Vibration-damping steel material - Google Patents

Abstract

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

Description

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

(Prior Art) Fully flexural materials used for machine parts, building parts, etc. are selected primarily for performance with mechanical strength as the most important consideration. 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 of thin steel plates, a composite steel plate has been developed in which a synthetic resin material with a thickness of 0.03 to 5 am is sandwiched between two steel plates of 0.3 to 3°51. It is used in automobile oil pans, etc., and 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, pitch p"10~20m5, height b of convex part 4 = 2~10mm, ground thickness a = 1.6~10mm, total thickness c = 3.6~20mm are used. be done.

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 (one pair) of the vertically striped steel pieces 1 are arranged so that the convex portions 4 of the two pieces of steel pieces are at the same position. , and the convex portions 4, 4 are in direct contact with each other, and the gap 6 formed between the respective concave portions 5, 5 is filled with a damping material 7. 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 vibration damping material 7 is preferably a viscoelastic resin, epoxy, phenol, polyethylene, etc., and is preferably one that has a high adhesive strength to the two steel materials 1. The material to be used is selected depending on whether elasticity is required or relatively rigidity is required. For example, when elasticity is required, natural rubber (NR), styrene butadiene rubber (SBR), and when elasticity is not required, nitrile rubber (NBR), fluoro rubber (F KM)
etc., but all of them must be able to improve the adhesive strength with the rope material 1.

The method for filling the organic material is to fill the gap 6 between the two steel materials LL 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 LL.
It is also possible to place the uneven parts and press-bond them. Next, the two faced each other
The side surfaces and contact surfaces of the sheets of steel 1.1 may be integrated by spot welding or line welding.

As the graphite-based material of the vibration damping material 7, flexible graphite sheet (thickness 0.2 to 1.5 mm, high purity graphite plate with ash content of 0.5% or less: product name "Permafoil" manufactured by Toyo Tanso Co., Ltd. ) or powdered graphite compression-molded between two steel sheets and fired. 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 high adhesive strength to the two steel materials 1.1. At this time, it is not preferable to use coarse-grained rice.

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 two steel materials 1.1
The convex portions 4.4 of each steel material 1°1 are located at the same position, but there is also a gap between the convex portions 4, 4 of each steel material 1°1, and this gap is also shown to be filled with damping material 7.

FIG. 4 shows a third embodiment of the present invention, in which the protrusion 4 of one steel material 1 and the four parts 5 of the other steel material 1 match, that is, the top of the protrusion 4 and the bottom of the recess 5 are in direct contact. , a gap 6 formed by a convex portion 4 and a concave portion 5 is filled with a control film 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 plates are filled with damping material 7, so t=2c+d
, and t=a+c+d, which means that although it is thicker, the damping effect is large.

In either case, it is lighter than a general steel material with the same thickness L and has a large vibration effect. Moreover, since the moment of inertia of the steel material in the direction of the vertical stripes is 1.2 to 2 times that of steel material of the same thickness, it becomes a composite material that is extremely strong against deflection.

Note that the thickness of d in Figures 3 and 5 is 0.05 depending on the application.
-1Qmm is selected.

The present invention will be further explained in detail below.

(Specific example 1) Earth pressure: a = 4.5 Height of the dragon convex part: b = 2.0 - Vertical striped steel materials are used, pitch: p = io. It was filled with (1) epoxy resin, (2) flexible graphite sheet, and 0 mortar, and in this case, d = 0.3 m. 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 y) Ordinary steel I Xl0-3 Invention steel ■ 1.5 to 5 xto-+ ■ 0.8 to 1.2 Xl0-1 ■ 0.
5-2. OXl0-1 (Specific Example 2) Ground thickness: a = 1.61 Convex height: b = 2. Using Ox* vertical striped steel material,
Pidge: p = 20 dragons were placed facing each other as shown in Figure 4, and the gap was filled with (1) nitrile rubber, (2) flexible graphite sheet, and (5) mortar. The thickness of this steel material of the present invention was 5,211 mm, and the damping effect was greater than that of a steel material of the same thickness.

(ti lapse coefficient y) Ordinary steel I Xl0-3 Invention steel ■ 1~3 XIO" ■ 0.5~1.5 Xl0-1■
0.1-1. OXl0-1 (Effects of the Invention) The vibration damping steel material according to the present invention has the characteristics of high strength, strong resistance to deflection, heat insulation effect, light weight, and large vibration damping effect, and is suitable for structures that require vibration prevention. In addition to being used for parts, transport equipment parts such as motor vehicles, power room floors, bridge parts, etc., it can also be used as parts that require the same strength as conventional thick plates and intermediate plates and are required to be lightweight.

[Brief explanation of drawings]

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

Claims (6)

[Claims] (1) A pair of vertically striped steel materials, one side of which is flat and the other side of which has unevenness parallel to the vertical direction, are arranged with the unevenness facing each other, and the gap between them is filled with damping material. Vibration damping steel material. (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 abutting shape. (3) The vibration-damping steel material according to claim 1, wherein the opposing convex portions of the opposing longitudinal striped steel materials are disposed opposite to each other with a gap interposed therebetween. (4) The control 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 members are in contact with each other, and a gap is provided between the convex and concave portions. Shaking steel material. (5) The vibration-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 between them without contacting each other. (6) The damping material filled in the gap is a synthetic resin, an organic material such as rubber, a graphite-based material such as a flexible graphite sheet, or mortar.
The damping steel material according to one selected from item 5.