JPS5934220B2 - Copper alloy for wind instrument reeds - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copper alloy for reeds of wind instruments, particularly those used as gagaku instruments.

The rod is an instrument with a reed called a shita, and is one of the important instruments of gagaku.

It is said that this strategy was first introduced to Japan during the Nara period as an instrument for Tang music.

Figure 1 shows the external appearance of this whistle.

It is made by inserting 17 bamboo tubes 2 into the top of a head 1 made of cherry wood or other material.

A mouthpiece 3 is provided on the side of the head 1.

The 17 bamboo tubes 2 are closely tied together in a ring shape, and the lower ends of the bamboo tubes have reeds 4, as shown in FIG. 2.

The composition of conventional copper alloys for leads is not clear, and the material is not uniform.

Recent analysis has revealed that it is a high-silver copper alloy (bronze) containing a large amount of impurities such as nickel before and after the tin 22 layered area, with the remainder being copper.

However, high tin alloys containing more than 20 parts by weight of tin become extremely hard and brittle.

Therefore, cold rolling or forging of this material results in thin cracks forming everywhere.

When manufacturing the above-mentioned reeds, the specified material is cut into rectangular strips, which are then ground with a file and further polished to a thickness of about 0.4 to 0.6 mm with a whetstone. Polish it thinly.

Next, in the center of this reed (screen), make a U-shape.
Scrape it thin with a metal chisel called sen.

This part vibrates and produces sound.

The material for this reed must be strong and hard as a vibration material, but as mentioned above, the tin content is extremely high, making it hard and difficult to manufacture. This made it extremely expensive.

In addition, the bronze alloy used for these reeds was traditionally cut from old Korean tableware, drums, etc., so the physical properties such as hardness varied depending on the type of bronze utensil, resulting in varying tones. It was not possible to obtain ideal leads, and it was even difficult to obtain materials.

The present invention has been made in view of this point.
5 stacked parts, lead 0.2 stacked parts or less, iron 0.3 stacked parts or less,
A copper alloy for wind instrument reeds consisting of the balance copper, and in addition to these, 20 to 25 overlapping parts of tin containing 0.15 overlapping parts of zinc, 0.2 overlapping parts of lead or less, 0.3 overlapping parts of iron or less, zinc. This invention relates to a copper alloy for wind instrument reeds consisting of 0.15% weight and the remainder copper.

This resulted in reeds with excellent tone, consistent quality, and was extremely easy to manufacture.

Judging whether the tone is good or bad is mostly based on intuition and requires musical elements, but the quality of the tone of a bronze reed depends mainly on its hardness, tensile strength, etc. The tin content has a major influence.

Bronze containing 20 to 25% by weight of tin has particularly excellent tone.

Looking at this in terms of physical properties, the hardness rapidly increases from the point where 20 weights of tin are placed, and becomes brittle when the weight exceeds 25 weights.

Tensile strength is 30 kg/yrt for 20 to 25 layers of tin
? shows high values before and after.

In other words, tin 2 has the same hardness and tensile strength as physical properties.
It has been found that bronze in the range of 0 to 25 overlapping parts is an extremely excellent lead material, and among these, the range of tin overlapping parts of 21 to 23 is the most excellent.

As mentioned above, in order to finish a bronze material into a lead, it is necessary to file or chisel it, but it contains less than 0.2 parts by weight of lead, more preferably less than 0.1 parts by weight. By doing so, the ease of cutting, that is, the machinability is significantly improved.

It should be noted that if the lead content exceeds 0.2 of the overlapped portion, it is not preferable because it deteriorates hot workability and stiffness and changes the sound quality.

Furthermore, by containing less than 0.3 parts of iron, preferably less than 0.2 parts of iron, the hardness of the bronze is further improved, resulting in clear and excellent sound quality.

The addition of iron also makes it slightly brittle, but this actually improves machinability.

If the iron exceeds 0.3 overlap, the brittleness will increase and cracks will occur during the manufacturing stage, which is not preferable.

Although an excellent lead material can be obtained with the alloy components of copper, tin, lead, and iron in the above proportions, it is possible to soften the bronze by adding zinc in an amount of 0.15% by weight or less, preferably 0.1% by weight or less. Can increase bulk.

Therefore, the brittleness caused by the iron content is offset by the zinc content, and an alloy with excellent tone and high machinability can be obtained.

Next, an example will be described.

Example The alloy components of the present invention shown in Table 1 were melted in a crucible.

After casting, this was face-sided and hot-rolled between 550°C and 720°C.

After hot rolling, solution treatment was performed by heating at 700° C. for 30 minutes and cooling with water.

The alloy obtained through this treatment was pickled and then cut into predetermined lengths to obtain pieces for lead production.

When this piece was cut into a reed, the tone was excellent, and the reed had good hot workability, cutting properties, and stiffness.

Table 1 shows a comparison with comparative alloys manufactured in the same manner.

◎: Best, ◎: Fairly good, ○: Good, △: Slightly bad, ×: Bad As shown in the above, the alloy of the present invention has a constant material quality, can produce a reed material with the most beautiful range, and is special. The production of reed materials, which used to be left only to highly skilled people, has now become easy even for those with moderate training, which is extremely useful for the production of wind instruments and, in particular, for the promotion of gagaku.

Needless to say, reed material that produces a delicate whistle-like tone can also be used as reed material for other wind instruments.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the external appearance of the measure. Figure 2A is a perspective view of the bamboo tube, and the mouth is a perspective view of the reed. 1; head; 2; bamboo pipe; 3; mouthpiece; 4; reed.

Claims (1)

[Claims] 1. 20 to 25 overlapping parts of tin, 0.2 overlapping parts of lead or less, 0.2 overlapping parts of lead.
Copper alloy for wind instrument reeds consisting of three layers and below, the remainder being copper. 2 20-25 tin overlapping parts, lead 0.2 weight ratio or less, iron 0.
A copper alloy for wind instrument reeds consisting of 3 layers or less, 0.15% zinc or less by weight, and the balance copper.