JPS6053741B2 - Heat treatment method for 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, especially reeds of gagaku instruments.

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

It is said that this flute was first introduced to Japan as an instrument for Tang music during the Nara period. Figure 1 shows the external appearance of this whistle.

17* on the top of the head 1 made of cherry wood etc.
It is made by inserting a bamboo tube 2. A mouthpiece 3 is provided on the side of the head 1.

The 17* bamboo tubes 2 are tied together in a ring shape, and at the bottom end of the bamboo tubes 2, as shown in FIG.
It has 4 leads. Bronze used for conventional star reeds was cut from old Korean tableware, gongs, etc., so it contained a large amount of impurities that degraded the tone, making it difficult to obtain the ideal reed. I couldn't do it.

Furthermore, the number of old bronze vessels mentioned above, which were considered to be relatively good materials, was decreasing in number, making it difficult to even obtain the materials. In view of this, the applicant has proposed that 20 to 25% by weight of tin
, Copper alloy for wind instrument reeds consisting of balance copper and tin20~
We have developed a copper alloy for wind instrument reeds consisting of 25% by weight of lead and less than 0.1% of lead, the balance being copper.These alloys are further hot-rolled and rolled at a temperature of 600°C to 750°C, especially 650°C to 720°C. It has been found that heating for ~2 hours significantly improves the ease of scraping required during the reed fabrication stage.

Judging whether the tone is good or bad is mostly intuitive and requires musical knowledge, but the quality of the tone of a bronze reed like this is mainly determined by its hardness, tensile strength, etc. The content of tin has a major influence.

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

From the viewpoint of physical properties, the hardness increases rapidly from 20% by weight of tin, and conversely becomes brittle when it exceeds 25% by weight. Tensile strength is 30 to 9/wdl at 20-25% by weight of tin
Shows high values before and after.

In other words, bronze with a tin content of 20 to 25% by weight, which has a physical property of 5 in terms of hardness and tensile strength, is an extremely excellent lead material, and of these, a tin content of 21 to 21% by weight provides the best sound quality. I found it to be excellent.

To finish a lead from bronze material, it is necessary to scrape it with a file or scrape it with a chisel, but it is easier to scrape if it contains lead of 0.2% by weight or less, more preferably 0.1% by weight or less. In other words, machinability is significantly improved. After casting, the alloy described above is hot rolled at 550°C to 72CfC, and further preferably at 650°C to 750°C.
Heat treatment for 1 to 2 hours at ℃ to 720℃ removes residual stress and improves machinability.

If the heating temperature is lower than 600℃, the heat treatment will not be effective.
If the temperature exceeds 750'C, part of the alloy will melt, so
Due to the heating time, it is necessary to keep the temperature below 750°C.
The most efficient temperature range is to perform the heat treatment at 650°C to 720°C for 1 to 2 hours. The copper alloy treated in this way has extremely high machinability, but if it is then subjected to mild cold rolling of around 5% *8 to the extent that it does not impede machinability or cause cracks, the lead material becomes dense and Since it becomes stronger and the tone improves, cold rolling can be applied as appropriate.

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 ground and hot rolled at 550°C to 720°C. After hot rolling, the alloy was subjected to solution treatment by heating three times at 700° C. and cooling in water, and the alloy obtained by this treatment was pickled and 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.

If the heat treatment temperature and time are outside the range of the present invention, the cutting performance and stiffness will deteriorate, and the tone will also deteriorate somewhat.
Table 1 shows comparative alloys manufactured in the same manner and a comparison of heat treatment conditions.

As described above, by the copper alloy heat treatment method of the present invention,
Reed materials with consistent quality and the most beautiful tone can be obtained, and the production of reed materials, which used to be left to special experts, has now become easy even for those with moderate training, making it possible to make reed materials for wind instruments. It is extremely useful for manufacturing and, in particular, for the promotion of gagaku.

It goes without saying that the reed material that produces a beautiful flute-like tone can also be used as reed material for other wind instruments.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the appearance of the rod. In Figure 2, A is a perspective view of the bamboo tube, and the mouth is a perspective view of the reed. 1...Head, 2...Bamboo tube, 3.
...Fukiguchi, 4...Lead.

Claims (1)

[Claims] 1. A copper alloy for wind instrument reeds, characterized in that an alloy consisting of 20 to 25% by weight of tin and the balance copper is hot-rolled and then heated at 600°C to 750°C for 10 minutes to 2 hours. Heat treatment method. 2. Copper for wind instrument reeds, characterized in that an alloy consisting of 20 to 25% by weight of tin, 0.2% by weight or less of lead, and the balance copper is hot-rolled and then heated at 600°C to 750°C for 10 minutes to 2 hours. Alloy heat treatment method.