JPH08110775A - Titanium alloy percussion instrument - Google Patents

Abstract

PURPOSE: To provide a percussion instrument made of a titanium alloy for the religious music or funerals and festivals by using a two-phase titanium alloy of the metal structure containing cubic system crystal grains having the aspect ratio of a specific value or below, and prolonging the reverberation time. CONSTITUTION: This percussion instrument is made of a two-phase titanium alloy of the metal structure containing cubic system crystal grains having the aspect ratio of 1.7 or below, preferably 1.2 or below. The two-phase titanium alloy capable of being ultra-plastically molded, e.g. a Ti-6Al-4V titanium alloy, is superplastically molded to manufacture the percussion instrument made of a titanium alloy for the religious music or funerals and festivals. It can be obtained by the normal plastic machining of the titanium alloy, however the machined structure contains slender crystal grains, and sound distortion is often generated by the anisotropy of the structure. The metal structure of this percussion instrument obtained by ultra-plastic machining contains nearly circular cubic system crystal grains having the average grain size in the range of 1.0-1.2μm, and it has little anisotropy of sound. The percussion instrument having a long reverberation time is obtained and an excellent effect is attained as the bell of a percussion instrument for the religious music or funerals and festivals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a percussion instrument having a long reverberation time, and particularly to a titanium alloy percussion instrument having a long reverberation time for religious music or funeral.

[0002]

2. Description of the Related Art Generally, cymbals, gongs, doras and the like are known as percussion instruments, and it is known that percussion instruments for religious music or funerals are preferable because of their good tone color and long reverberation time. These percussion instruments are usually formed by molding a copper alloy into a predetermined shape by plastic working or casting,
Finished by grinding and polishing. In particular, in order to improve the tone of percussion instruments, it may be made of silver alloy or gold alloy in addition to copper alloy.

[0003]

However, although the percussion instrument made of the conventional copper alloy, silver alloy, gold alloy or the like has a good timbre, the reverberation time is not sufficient, especially the reverberation time of the percussion instrument for religious music or funeral. If the time is short, the sacred feeling will not last during worship or ceremonies.For example, if the reverberation time of the bell bell used during the reading of funerals is short, it will harmonize with the phonology of the sutras to create a magnificent and mysterious atmosphere. It will be ineffective. Therefore, there has been a demand for a percussion instrument having a reverberation time longer than ever before.

Further, since the conventional percussion instrument is manufactured by plastic working or casting, distortion of the sound often occurs due to the anisotropy of the structure. Therefore, the percussion instrument manufactured by plastic working or casting is subjected to heat treatment. Although the texture is also made uniform, there is a problem that the percussion instrument is deformed by heat treatment, and an excellent funeral percussion instrument is a metal block that is heat-treated to make the texture uniform. Since it was manufactured by performing mechanical processing such as grinding and hollowing, it was inevitably expensive.

[0005]

The inventors of the present invention have made earnest studies to easily obtain a percussion instrument having a good tone color and a reverberation time longer than before, and as a result, a known Ti-6Al-4V titanium alloy was superplastically formed. The percussion instrument produced in this way has a good timbre, and since the metal structure of the percussion instrument has equiaxed crystal grains that are nearly circular, there is little acoustic anisotropy, and conventional copper alloy, silver alloy or gold alloy percussion instruments are used. Since the reverberation time is significantly longer than that of the above, we obtained the knowledge that it is excellent as a percussion instrument especially for religious music or funeral.

The present invention has been made on the basis of such findings, and titanium made of a two-phase titanium alloy having a metal structure having equiaxed crystal grains with an aspect ratio of 1.7 or less, preferably 1.2 or less. It is characterized by alloy percussion instruments, especially titanium alloy percussion instruments for religious music or funerals.

However, the percussion instrument of the present invention is not limited to the titanium alloy percussion instrument for religious music or funeral, and can be used as a normal percussion instrument for music. The most preferred use of the titanium alloy percussion instrument for religious music or funeral of the present invention is a bell used during sutra reading,

The titanium alloy percussion instrument for religious music or funeral of the present invention is a superplastically moldable two-phase titanium alloy,
For example, it can be made by superplastic forming a Ti-6Al-4V titanium alloy. This titanium alloy percussion instrument for religious music or funerals can be obtained by ordinary plastic working of titanium alloy, but its structure has a processed structure in which crystal grains are elongated and elongated, and the anisotropy of the structure causes Distortion often occurs. However, the metallic structure of the titanium alloy percussion instrument for religious music or funeral of the present invention obtained by superplastic processing has equiaxed crystal grains close to a circle with an average grain size of 1.0 to 1.2 μm. Since it has, there is little acoustic anisotropy.

Further, the hardness of the titanium alloy percussion instrument for religious music or funeral is adjusted by adjusting the amount of oxygen or nitrogen mixed with Ar gas used during superplastic forming within the range of 5% or less, You can get various percussion instruments made of titanium alloy for religious music or funeral. Therefore, the present invention provides a method of manufacturing a titanium alloy percussion instrument for religious music or funerals which is superplastically formed by Ar gas containing oxygen: 5% or less, or nitrogen: 5% or less
It is also characterized by a method of manufacturing a titanium alloy percussion instrument for religious music or funerals that is formed by superplastic molding using r gas.

[0010]

[Examples] A Ti-6Al-4V titanium alloy slab having a thickness of 5.0 mm was prepared, and this Ti-6Al-4V titanium alloy slab was superplastically formed under the conditions shown in Table 1 to obtain the maximum outer diameter. : 100 mm, height: 120 mm, average thickness: 3.4
mm titanium alloy bells 1 to 7 of the present invention were produced. Further, the Ti-6Al-4V titanium alloy thick plate was subjected to ordinary hot and cold deep drawing to prepare comparative titanium alloy bells 1 and 2, and the obtained titanium alloy bells 1 and 2 of the present invention were obtained.
The metal structures of No. 7 and the comparative titanium alloy bells 1 and 2 were observed to determine the aspect ratio, and the Vickers hardness was measured. The results are shown in Table 1.

Further, for comparison, each thickness:
Cu-30Zn brass plate with 4.7 mm, Ag-7.
5Cu silver alloy plate and 18K gold alloy plate are deep-drawn,
The conventional bells 1 to 7 having the same dimensions as the titanium alloy bells 1 to 7 of the present invention and the bellows 1 to 2 made of the comparative titanium alloys have a maximum outer diameter of 100 mm, a height of 120 mm, and an average thickness of 3.4 mm. 3 was produced, the metal structure was observed to determine the aspect ratio, and the Vickers hardness was measured, and the results are shown in Table 1. These aspect ratios are the ratio of the average major axis diameter to the average minor axis diameter of the crystal grain size (average major axis diameter / average minor axis diameter).

[0012] The obtained titanium alloy bells 1 to 7 of the present invention,
Comparative titanium alloy bells 1 and 2 and conventional bells 1 to 3 were hit with a striking rod with the same strength, and the reverberation time length at that time was measured. The results are shown in Table 1.

[0013]

[Table 1]

[0014]

From the results shown in Table 1, it is understood that the titanium alloy bells 1 to 7 of the present invention have a reverberation time significantly longer than the conventional bells 1 to 3. However, as can be seen in the comparison titanium alloy bells 1-2, the aspect ratio is 1.7.
It can also be seen that the reverberation time becomes shorter when the value exceeds.

As described above, all the titanium alloy percussion instruments of the present invention have a reverberation time significantly longer than that of the conventional percussion instruments. Therefore, the titanium alloy percussion instruments have an excellent effect as a bell for a religious or funeral percussion instrument. Of course, but others,
It can contribute greatly to the development of the music industry by creating a new rhythm of music by using it as a normal percussion instrument such as dora, cymbal, gong, etc. Also, the titanium alloy percussion instrument of the present invention is lightweight in titanium alloy itself. Therefore, it is easy to carry around at a concert or funeral.

Claims (3)

[Claims] 1. A titanium alloy percussion instrument comprising a two-phase titanium alloy having a metal structure having equiaxed crystal grains having an aspect ratio of 1.7 or less. 2. A titanium alloy percussion instrument for religious music or for funerals, characterized by comprising a two-phase titanium alloy having a metal structure having equiaxed crystal grains having an aspect ratio of 1.7 or less. 3. The titanium alloy percussion instrument for religious music or funeral according to claim 2, is a bell.