JPS5827325B2 - Method of manufacturing vibration damping alloy - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a vibration damping alloy, and more particularly to a method for producing a vibration damping alloy with excellent wear resistance.

Recently, emphasis has been placed on noise and vibration generated from various machines and equipment as a pollution problem.

For this reason, when designing and manufacturing various machines and equipment, efforts are made to reduce the noise and vibration generated by these machines and equipment as much as possible.

By the way, one way to effectively reduce such noise and vibration is to use materials with a high vibration damping capacity as structural members of machines and equipment, so that the noise and vibration are absorbed in the parts where they are generated. .

Plastics, Ni--Ti alloys, Mn--Cu alloys containing 40 to 90 parts of Mn, cast iron, and the like are conventionally known as materials that absorb such noise and vibration.

However, plastics are inferior in both mechanical strength and heat resistance, and are not suitable as structural materials for vibration generating parts.

In this respect, alloys are superior to plastics (however, Mn-Cu alloys have better wear resistance), but because the critical temperature for vibration damping ability is low at 50 to 80℃, When used as a structural member subject to high temperatures, it has the disadvantage that it cannot exhibit the required vibration damping ability.

In addition, Ni-Ti alloys have extremely poor machinability, so their fields of use are limited, and these vibration-damping alloys are exposed to temperatures of about 100°C, such as compressor valve seats and rotary compressor blade materials. Moreover, it is not suitable for cases where wear resistance is required.

The present invention was developed in view of the above points, and can be machined, has excellent wear resistance and mechanical strength, and has three
It is an object of the present invention to provide a method for manufacturing a vibration damping alloy that exhibits and maintains a required vibration damping ability even at high temperatures of about 00°C.

The present invention will be described in detail below.The present invention has a weight ratio of A18.
% to 15%, SiO, 5% or less, Mnl% or less, and Fe-Al series alloy having substantially the remainder occupied by Fe. It is.

The reason why the composition ratio of the vibration damping alloy according to the present invention is limited as described above is as follows.

First of all, A7ff contributes to improving vibration damping ability and wear resistance, and if it is less than 8 coefficients, the improvement in wear resistance is not sufficient.
Further, if the number exceeds 15, the vibration damping ability is insufficient and the vibration damping function cannot be fully achieved.

Further, the same components of Si and Mn are added for desulfurization and deoxidation, and the amount thereof is selected to be 0.5 coefficient or less and 1φ or less.

However, the remaining Fe may contain unavoidable impurities (for example, C9P, etc.).

In addition, in order to make this Al-Fe alloy exhibit sufficient vibration damping ability for practical use, annealing treatment is necessary to obtain vibration damping ability, and the annealing treatment temperature is 600 to 1200°C.
It is preferable to select at a temperature of

That is, this annealing treatment promotes the removal of internal stress in the alloy and the growth of crystallinity, thereby increasing the mobility of the domain wall and thereby improving the vibration damping ability.

However, since this annealing treatment is a function of temperature and time, it cannot be determined generally, but in order to obtain a practically effective vibration damping ability, it is necessary to use a plate with a thickness of 1r/L7n for 30 minutes. When measured in minutes, a range of about 600 to 1100°C was appropriate.

Next, examples of the present invention will be described.

Three types of casting materials obtained by vacuum casting were prepared with the compositions (weights) shown in the table.

Test pieces with a thickness of 1 mm, a width of 107 ILrIL, and a length of 100 mm were cut out from these cast materials.
A vibration damping alloy was obtained by heat treatment and annealing at 100°C.

The results of measuring the logarithmic damping ratio (δ) of the thus obtained vibration damping alloy piece by subjecting it to bending vibration under the same conditions are shown in the table together with the annealing conditions.

Note that the value of the logarithmic damping rate (δ) is a value when the value of the logarithmic damping rate (δ) of the cold-rolled carbon steel 540C material is set to 10.

As is clear from the measurement results, the vibration damping alloy according to the present invention is significantly superior to the carbon steel plate.

Furthermore, the vibration damping ratios of the vibration damping alloy according to the present invention and the Ni-Ti vibration damping alloy at room temperature to 350° C. were measured.

The Ni-Ti vibration damping alloy exhibits excellent vibration damping ability near room temperature, but deteriorates significantly at around 100°C.

For this reason, in the case of a Ni-Ti system, it is not suitable from the viewpoint of reliability as a vibrating member (which tends to cause a rise in temperature) and exhibits a large hysteresis in the stress-strain curve when subjected to a large load.

However, the vibration damping alloy according to the present invention maintains excellent vibration damping ability even at high temperatures of about 350° C., so it can be said that it provides a great advantage in this respect.

In addition, in the vibration damping alloy according to the present invention, the Al content is 8 to 15
By setting the weight ratio to the maximum, it showed excellent properties in terms of wear resistance.

As explained above, the vibration damping alloy according to the present invention has 350
It maintains excellent vibration damping ability even at temperatures as high as ℃, and has excellent wear resistance and hardness.

Thus, the vibration damping alloy of the present invention can be said to be a practically excellent vibration damping alloy due to its good machinability, and therefore the ease of making it into structural materials or parts.

The vibration damping alloy of the present invention may further contain elements such as S, Sb, and Ca to improve machinability, and Ni and Cu to further improve corrosion resistance.

Claims (1)

[Claims] 1. Annealing treatment is applied to an Fe-Al alloy having a weight ratio of more than A78 and up to 15%, Si of 0.5% or less, Mn of 1% or less, and Fe substantially occupying the balance. Method of manufacturing vibration damping alloy.