JPS6053740B2 - Heat treatment method for copper alloy for wind instrument reeds - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for heat treating a copper alloy for reeds of wind instruments, particularly bamboo reeds used as 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 bamboo was first introduced to Japan as an instrument for Tang music during the Nara period. Figure 1 shows the appearance of this bamboo. It is made by inserting a 17* bamboo tube into the top of a head made of cherry wood. There is a mouthpiece on the side of the head.

The 17* bamboo tubes are tied together in a shape, and the lower ends of the bamboo tubes have reeds, as shown in FIG. 2. The composition of conventional copper alloys for leads is not clear and the material is not constant, but according to recent analysis, it contains around 21% tin, a large amount of impurities such as nickel, and the rest is is known to be a high tin copper alloy in which copper is copper.

However, when a high tin alloy with a tin content of more than 2% is formed, it becomes extremely hard and brittle.

Therefore, cold rolling or forging of this material results in thin cracks forming everywhere. When manufacturing the New Year's reeds, first, the specified material is cut into rectangular strips, then sanded with a file, and then polished with a grindstone to a thickness of about 0.4 to 0.6 mm. increase.

Next, use a metal chisel called a sen to thin the reed so that it forms a U-shape in the center.
This part vibrates and produces sound. The material for this reed (reed) needs to be strong and hard as it is used as a vibration material, but as mentioned above, the tin content is extremely high, making it hard and difficult to manufacture. It had become very expensive. In addition, the bronze alloy used for traditional reeds was cut from old Korean tableware, drums, etc., so the physical properties such as hardness differ depending on the type of bronzeware, resulting in different tones and different ideals. They were not able to get any leads, and it was even becoming difficult to obtain materials. In view of this point, the applicant has proposed that tin be 20 to 25% by weight, lead be 0.2% by weight or less, and iron be 0%.
．． Copper alloy for wind instrument reeds consisting of 20-25% by weight of tin, 0.15% by weight or less of zinc, and 0.1% by weight of lead. Heel weight % or less, iron 0. We have developed a copper alloy for wind instrument reeds consisting of 0.15% by weight or less of slag, 0.15% by weight of zinc or less, and the balance copper. After hot rolling the same alloy, the temperature ranges from 600°C to 750°C, especially from 650°C to 72°C. ) It has been found that by heating the powder for 1 to 2 hours and preferably cooling with water, the ease of cutting required at the reed manufacturing stage is significantly improved.

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 intuitive and requires musical knowledge, but the quality of the tone of a bronze reed mainly depends 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.

From the viewpoint of physical properties, the hardness rapidly increases from 20% by weight of tin, and becomes brittle when it exceeds 25% by weight. Tensile strength is 30k9/WIL with 20-25% tin by weight
Shows high values before and after. In other words, bronze with a tin content of 20 to 25% by weight, which has high hardness and high tensile strength, was excellent in terms of physical properties. It is a lead material, and among these, tin 21
It was found that a range of ~2 slag weight% was the best. As mentioned above, in order to finish bronze material into lead, it is necessary to file and chisel it, but lead-free. When the content is less than 1% by weight, more preferably 5% by weight or less, and 0.1% by weight or less, ease of cutting, that is, machinability is significantly improved.

Incidentally, if the lead content exceeds 0.2% by weight, it is not preferable because it deteriorates hot workability and stiffness and changes the sound quality.

Furthermore, iron is added to 0. 0.2% by weight or less, preferably 0.2% by weight
By containing the following, the hardness of the bronze is further improved, resulting in a clear tone and extremely excellent sound quality. Also, although the addition of iron makes it slightly brittle, this actually improves machinability.

Iron is 0. Exceeding the sludge weight percentage is undesirable because the brittleness increases and cracks occur during the manufacturing stage. An excellent lead material can be obtained with the alloy components of copper, tin, lead, and iron in the above proportions, but the zinc content is preferably 0.15% by weight or less, preferably 0.15% by weight or less.
By containing 1% by weight or less, the softness of bronze can be increased.

Therefore, an alloy can be obtained in which the brittleness caused by the iron content is offset by the zinc content, and which also has excellent tone and great machinability. After casting the alloy described above,
Hot rolling at 720°C and further heat treatment at 6000°C to 750°C, preferably 650°C to 720°C for 1 to 2 hours removes residual stress and improves machinability.

If the heating temperature is lower than 600'C, the heat treatment will have no effect, and if it exceeds 750°C, part of the alloy will melt.
Due to the heating time, it is necessary to keep the temperature below 750°C.
And the most efficient temperature range is 650℃~720℃
The method is to heat the powder for 1 to 2 hours. The copper alloy treated in this way has extremely high machinability.
If mild cold rolling is performed before and after, the lead material will become denser and stronger and the tone will improve, so cold rolling can be performed 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-milled and hot-rolled between 55 (generations) and 72 (generations). 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.

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 slightly.

Table 1 shows comparative alloys manufactured in the same manner and a comparison of heat treatment conditions. As described above, the copper alloy heat treatment method of the present invention makes it possible to obtain a reed material with a constant material quality and the most beautiful tone.Moreover, the production of reed materials, which used to be left only to specialized experts, can now be made to a suitable level. It has become easy for even experienced people to make it, and it is extremely useful for the production of wind instruments and, in particular, for the promotion of gagaku.

It goes without saying that the reed material, which produces a beautiful rod-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 external appearance of the whistle. In Figure 2, A is a perspective view of a bamboo tube and a perspective view of a shout reed. 1...Head, 2...Bamboo tube, 3.
...Fukiguchi, 4...Lead.

Claims (1)

[Claims] 1. 20 to 25% by weight of tin, 0.3% by weight or less of iron, and 0.0% of lead.
1. A method for heat treating a copper alloy for a wind instrument reed, which comprises hot rolling a copper alloy consisting of 2% by weight or less, the balance being copper, and then heating the alloy at 600°C to 750°C for 10 minutes to 2 hours. 2 After hot rolling, at 650°C to 720°C for 10 minutes to 2
2. A method of heat treating a copper alloy for a wind instrument reed according to claim 1, which comprises heating for a period of time. 3 20-25% by weight of tin, 0.3% by weight or less of iron, 0.0% by weight of lead.
After hot rolling a copper alloy consisting of 2% by weight or less, 0.15% by weight or less of zinc, and the balance copper, it is rolled at 600°C to 750°C for 10
A method for heat treating a copper alloy for a wind instrument reed, the method comprising heating for a minute to two hours. 4 After hot rolling, at 650°C to 720°C for 10 minutes to 2
4. A method of heat treating a copper alloy for a wind instrument reed according to claim 3, wherein the method comprises heating for a period of time.