JPH01255653A - Method for manufacturing vibration-proof aluminum alloy members - 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 [Field of Industrial Application] The present invention relates to a method of manufacturing a vibration-proof aluminum alloy member. Specifically, the present invention is suitably used for purposes such as preventing damage caused by vibration and noise of various types of equipment. The present invention relates to a method of manufacturing an aluminum alloy member with excellent vibration damping properties.

[Conventional technology]

This is one of the vibration-proof alloys currently in practical use.

Fe-based alloy 11 There are Ni-based alloy, Mn-based alloy, Zn-based alloy, and Pigeon-based alloy.

[Problem to be solved by the invention]

However, each of these alloys has a high specific gravity, requires complicated manufacturing conditions, and is expensive.

It has problems such as poor corrosion resistance.

On the other hand, aluminum alloys are lightweight, have excellent specific strength and corrosion resistance, and are reasonable in terms of cost.

Up until now, it has not been put into practical use due to its vibration-proofing properties.

On the other hand, the present inventor has previously developed Ni II~tow
t%, Fe-Si-Zr, V-Co, B, Ti, Sn
.

Aluminum containing a total of 0.05 to 2.5 wt% of one or more elements selected from the group consisting of Ca, Sr, and rare earth elements, and whose second phase particles have an average particle diameter of less than IO It was discovered that the alloy has excellent anti-vibration properties.

Incidentally, anti-vibration alloys are actually used as various product members, but the anti-vibration performance of such members is often influenced by their shape.

In some cases, the desired performance was not achieved.

[Means to solve the problem]

Therefore, as a result of intensive studies to solve these problems with the prior art, the inventors of the present invention have found that by modifying the surface layer of the aluminum alloy member using a specific method, the vibration damping performance of the member can be improved. By discovering this, we have arrived at the inventions of the present application.

That is, the gist of the first invention of the present application is that N1tt is 1% by weight.
-/l:)%, as well as Fe, Si-Zr, V.

Contains a total of 0.05 to 2.5% of at least one element selected from the group consisting of Co, B, Ti, Sn-Ca, Sr, and rare earth elements, and the balance is aluminum and a total of 0.5%. It has a composition consisting of the following impurities, and the average particle size of the second phase particles is i.

For members made of aluminum alloy that are below the
The present invention relates to a method of manufacturing a vibration-proof aluminum alloy member, characterized in that the surface layer portion thereof is subjected to physical processing treatment to soften the surface layer portion.

In addition, the gist of the second invention of the present application is to physically process the surface layer of the member made of the aluminum alloy, and then annealing it at a temperature of 300C or less to soften the surface layer. A method of manufacturing a vibration-proof aluminum alloy member is provided.

One method of the present invention will be explained in detail below.

In the method of the present invention, Ni'1~t at 1 weight percentage
(7% 11 and Fe-Si, Zr, V-Co, B
.

A total of at least one element selected from the group consisting of Ti-Sn, Ca, Sr, and rare earth elements from 0.05 to
2.5%, the balance is aluminum and a total of 0.5
An aluminum alloy is used which has a composition consisting of impurities of 1,101t or less and whose second phase particles have an average particle size of 1101t or less. Among the impurities with a total content of 0.5% or less, Cu is particularly important.

(2) The total amount of Zn is preferably 0.3% or less, more preferably o, i% or less.

When Ni is added to At, the matrix At
Ni particles are precipitated inside to form a eutectic structure. The interface between At and Ni particles, which are the second phase, absorbs vibrations and improves the damping ability, but when the Ni content is less than 17%, sufficient damping ability is not achieved because fewer second phase particles are formed. On the other hand.

If it exceeds 10%, coarse second phase particles are produced, which does not improve the damping ability and also results in inferior mechanical properties.

Therefore, the amount of Ni added is &-/0%, preferably u
, 5-g%.

Fe-Si, Zr, V, Co, B, Ti, Sn.

Ca, Sr, and rare earth elements refine the crystals, increase grain boundaries, and form fine second phase particles to improve the damping ability. The total amount of these elements is o, o s %
If the amount is less, the crystal refinement effect will not be sufficient, and if the total amount of these elements exceeds Co and S%, coarse intermetallic compounds will be formed and the damping ability and mechanical properties will be impaired. . Therefore, the amount of these additions is between 0.05 and 2. s %
, preferably 0.06 to 2.0 inches.

In addition, in the aluminum alloy used in the present invention,
In addition to having the above-mentioned specific composition, it is necessary for the crystal structure that the second phase particles have an average particle size of 10 μm or less.

That is, by setting the average particle diameter of the second phase particles to 1101t or less, the interface of the second phase particles can be increased, thereby making it possible to obtain a damping capacity of Q-'=S X 10-3 or more. . The average particle size is more preferably 7 μm or less, and even more preferably 5 μm or less.

Here, the above-mentioned damping capacity Q-1 indicates a measure of converting externally applied vibration energy into thermal energy, and the vibration energy E possessed by the vibration system at the beginning of 1 cycle of vibration, and the vibration energy E possessed by the vibration system during 1 cycle of vibration. If the energy converted into thermal energy is △E, then there is the following relationship.

As for the method of controlling the above-mentioned organization.

There are methods such as rapid cooling during solidification from a molten liquid and methods of physically dividing the second phase particles by strong processing.

Specifically, continuous casting is a rapid cooling method.

method, extrusion method, pultrusion method, etc.

Now, in the method of the present invention, the vibration-isolating performance can be further improved by modifying the surface layer of product parts of various shapes made of a vibration-isolating aluminum alloy having the above-mentioned specific composition and structure in a specific manner. It is characterized by improving

In other words, it focuses on the fact that vibrations from the outside are transmitted to the inside of a member through the surface layer, and attempts to attenuate vibrations in the surface layer by improving internal friction in the surface layer. be.

A seventh method for modifying the surface layer is as follows.

This is to soften the surface layer by subjecting the surface layer to physical processing.

The above-mentioned physical processing is 1.For example, processing force such as compression, tension, shearing, etc. is applied to the surface layer, such as shot peening processing (shot blasting method), honing processing, spinning processing, pultrusion processing, press forming processing, hairline processing, or cutting processing. This is done by a loading method. -Although the aluminum alloy inside the film is hardened by the above processing.

The processed surface layer becomes softer. This softening phenomenon is due to the formation of fine cell grain boundaries, and it is thought that these cell grain boundaries increase the internal friction of the crystal and improve the vibration damping performance.

There is no particular limit to the depth of the softening treatment described above, but performing the softening treatment too deeply will unnecessarily reduce the strength of the surface layer and also significantly change the dimensions of the product component itself. So it's not a good thing. The specific depth of the treatment may be determined keeping these things in mind, but sufficient results can usually be obtained within a range of 3001Rn from the surface, more preferably within 150 μm.

The second method for modifying the surface layer is as follows.

After physically processing the surface layer, the surface layer is softened by annealing at a temperature of 300° C. or lower.

Regardless of the processing rate of the physical processing, annealing at a temperature of 300C or less promotes the formation of fine cell grain boundaries. On the other hand, heating at a temperature exceeding 300°C is undesirable because it promotes recrystallization and the cell grains become coarser due to the disappearance and coalescence of cell grain boundaries, so that the internal friction actually decreases.

In addition, the anti-vibration performance can be further improved by etching the surface layer before, after, or in an intermediate step of the step of the method of type 2 fii for modifying the surface layer to partially corrode the surface layer. can be done. Specifically, grain boundaries in the surface layer, second phase particles, or aluminum alloy are removed by chemical etching treatment using chemicals containing chloride ions and hydroxide ions, or electrolytic etching treatment, etc.
Partial corrosion removal of J socks. This forms discontinuities in the crystal, structurally increasing internal friction and improving vibration damping performance.

〔Example〕

Next, aspects of the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to the following Examples unless the gist thereof is exceeded.

In the examples, the damping capacity was measured by the mechanical impedance method at a resonance frequency in the range of SOO~/000 HX, and the hardness was measured by the micro-Vickers hardness method using a sample cross section. Average particle size was measured by optical microscopy.

Example 1 Alloys A-C having the composition shown in Table 1 were melted in the atmosphere in an electric melting furnace, and then cast using a water-cooled vertical continuous casting method to obtain 17
A billet of 7M1φ was prepared, and then soaked at SOθ°C for 3 hours.

Next, the billet was hot extruded at 40°C to obtain a square pipe (cross-sectional outer diameter: 2s x 25-1 wall thickness: 5mm) as shown in FIG. Then, the surface layer portion of the pipe was treated under the conditions shown in Tables 2 and 3.

Next, cut the pipe to obtain length/llQrm-width 1
A test piece having a rotational speed of 0 rm and a thickness of 1 m was used to measure the damping capacity.

The results are shown in Table 3.

Table 3 2) Surface: Measured at a depth of 75 μm per cross section.

*3) Inside: Measured at a depth of 075 cm per cross section.

Example 1: Alloy D-F having the composition shown in Table q was melted in the air in an electric melting furnace, and then made into a rectangular container (external diameter s o m x 15θI+III x 2θ) having the shape shown in FIG.
Km) (wall thickness: 5 mm) was obtained. The surface layer of the container was then treated under the conditions shown in Tables 2 and 5. Next, the container was cut into 5 test pieces with a length of 1Qrm, a width of 1OIIO11, and a thickness of 5.

It was used to measure the attenuation capacity.

The results are shown in Table 5.

Table S *2) Same as Table 3.

3) Same as Table 3.

As is clear from Tables 3 and 5, the attenuation ability can be improved by performing the surface modification treatment of the present invention.

〔Effect of the invention〕

The aluminum alloy member obtained by the method of the present invention is
Due to its excellent damping performance, it is suitable for applications that require vibration isolation, such as OA equipment parts such as platen rolls, acoustic parts such as insulators, automobile parts such as transmission cases, precision machinery parts, and electronic equipment parts. It can be used for.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing the shape of the member manufactured in Example 1. FIG. 2 is a perspective view schematically showing the shape of the member manufactured in Example I. Patent applicant Naoetsuyo Kasei Co., Ltd. Patent attorney Hase - and 1 other person 1 Figure 2

Claims (1)

[Claims] (1) Ni 4 to 10% by weight percentage, as well as Fe and Si
, Zr, V, Co, B, Ti, Sn, Ca, Br and rare earth elements in a total amount of 0.05 to 2.5%, with the remainder being aluminum and For a member made of an aluminum alloy having a composition consisting of a total of 0.5% or less of impurities and in which the average particle size of second phase particles is 10 μm or less. A method for producing a vibration-proof aluminum alloy member, which comprises subjecting the surface layer to a physical processing treatment to soften the surface layer. (2) The method for manufacturing a vibration-proof aluminum alloy member according to claim 1, characterized in that the surface layer is partially corroded and removed by etching the surface layer before or after the physical processing treatment. Method. (3) Ni 4-10% by weight percentage, as well as Fe, Si
, Zr, V, Co, B, Ti, Sn, Ca, Sr, and rare earth elements in a total amount of 0.05 to 2.5%, with the remainder being aluminum and After physical processing is applied to the surface layer of a member made of an aluminum alloy having a composition consisting of impurities of 0.5% or less in total and an average particle size of second phase particles of 10 μm or less. A method for producing a vibration-proof aluminum alloy member, characterized in that the surface layer is softened by annealing at a temperature of 300° C. or lower. (4) In the method for manufacturing a vibration-proof aluminum alloy member according to claim 3, the surface layer portion is etched before the physical processing, between the physical processing and annealing, or after the annealing. A method characterized by partially corroding and removing the surface layer.