JPS5934761B2 - Vibration-absorbing metal material - Google Patents

Description

[Detailed description of the invention] The present invention relates to a metal material with excellent vibration absorption properties.

Although structures made of conventional metal materials have high mechanical strength, they have extremely low absorption of vibration energy, and as a result, they have the disadvantage that the structures themselves tend to resonate due to external vibrations. On the other hand, although viscoelastic materials such as rubber or plastic have a high vibration energy absorption property, they have the disadvantage that they do not have sufficient mechanical strength and cannot provide sufficient strength as a structure.

Therefore, it has been necessary to adopt a structure in which parts that are susceptible to external vibrations are isolated from the vibration source through springs or materials with high vibration absorption properties such as rubber and plastic.

The present invention is a novel metal member that has both vibration absorbing properties and sufficient mechanical strength, and will be described in detail below.

The vibration-absorbing material of the present invention has a structure in which a porous portion of a sintered alloy is filled with a plastic monomer, and only the surface of the plastic monomer and a layer in the vicinity thereof are hardened. The sintered alloy is obtained by so-called powder metallurgy, in which metal powder is press-molded and then heated.

After impregnating the porous part of the sintered alloy obtained in this way with a liquid plastic monomer (immersion impregnation or vacuum impregnation), only the surface and its neighboring layers are hardened by heating only the surface or by catalytic polymerization. , the porous portion is filled with a highly viscous plastic monomer, resulting in a metal composite material with a hard surface.

Table 1 shows plastic monomers and polymerization agents that can be used in the present invention.

Table 1 The metal material of the present invention has extremely high vibration absorbing properties due to the composite structure described above.

That is, when bending stress is applied to the metal material due to vibration energy propagated from the outside, the filled plastic monomer causes plastic deformation in the metal material, causing friction between the molecules of the plastic monomer and the bond between the metal and the plastic. Vibrational energy that tends to deform the metal material is absorbed by mutual friction at the boundaries of the monomers, and resonance of the material caused by external vibrational energy is quickly attenuated.

In this way, the metal material according to the invention has great vibration-absorbing properties, and moreover, the degree of hardening of the filled plastic can be reduced.
For example, it can be relatively easily changed by changing the heating temperature during curing, the amount of polymerizing agent, etc., and therefore it is possible to easily obtain a material having vibration absorbing properties as required.

In addition, by mixing a small amount of curing agent with the monomer before impregnation to the extent that it does not completely cure, only the surface of the monomer is cured, and at the same time, the internal monomer is not cured and only the viscosity is increased. It is also possible to create a state with a large loss, and various forms can be taken as necessary.

Claims (1)

[Claims] 1. A vibration-absorbing metal material based on a sintered metal, characterized in that a porous portion of the sintered metal is filled with a plastic monomer, and only the surface of the plastic monomer and a layer near the surface are hardened.