JPS63163397A - Sound board - 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: "Industrial Application Field" This invention relates to a musical instrument for percussion instruments, and relates to a method of manufacturing a fiber which has reinforcing fibers oriented in one direction and has cavities extending in the same direction as the reinforcing fibers. The mechanical strength of the tone plate is improved by laminating and integrating a plurality of reinforced resin plates.

``Prior Art and Its Problems'' Various tone plates made of fiber-reinforced resin have been proposed for percussion instruments in place of wooden tone plates whose tone color and scale tend to change depending on weather conditions and the like.

For example, a sound plate made of reinforced fiber resin has a patent application filed in 1973.
No. 7-129238 (Japanese Unexamined Patent Publication No. 1989-19997)
There is something shown in

This tone plate has many cavities that extend in the same direction as the orientation of the reinforcing fibers in the fiber-reinforced resin, and has the unique sound elongation characteristic of fiber-reinforced resin tone plates, as well as the wooden tone plate. It is an excellent tone plate that combines the soft and warm tone characteristic of .

・However, in this case, when forming the cavity, fibers or rods of a low melting point alloy, thermoplastic resin, or heat-melting material are oriented in the same direction as the reinforcing fibers and dispersed in the resin. This method involves solidifying the resin and then heating it to melt and remove the fibers or rods.

For this reason, there is a drawback that the number of manufacturing steps increases and the manufacturing cost increases.

So^Toshina? Kashu 9 ancient + 10 + - st, small 1 pu dried eggplant 1 prisoner No. 59-110124 (Unexamined Japanese Patent Publication No. 60-25409
There is one shown in Publication No. 1).

This tone plate is a fiber-reinforced resin plate material (hereinafter abbreviated as plate material) with a rectangular cross section as shown in Fig. 4! It is made by integrating multiple layers of... The plate l is made by oriented reinforcing fibers in one direction and dispersing them in a resin, and molds and hardens the resin long in the orientation direction of the reinforcing fibers Kt. On one side along
A large number of grooves 2 extending in the same direction as the reinforcing fiber orientation direction.
・is formed. These grooves 2... may be formed, for example, by a pultrusion method during the molding of the plate l, or the plate! It is formed by cutting after molding. Then, this tone plate is made by overlapping (iσ) the grooves 2... of the plate material 1 with the unique surface of another plate material 1, and fixing them with adhesive to form a plurality of plate materials 1... - Obtained by laminating and integrating.

Since such a tone plate is obtained by laminating and integrating plate materials l with )14, it can be easily manufactured, and the manufacturing cost can therefore be reduced.

However, in this tone plate, groove 2 of plate material 1...
・Since the surface on which is formed and the non-grooved surface of the other plate material 1 are fixed and laminated by adhesive, it is difficult to apply just enough adhesive to the adhesive surface when bonding. If there is a large amount of adhesive, the adhesive that protrudes from the adhesive area may cause damage.
The cavity formed between the groove 2 and the adhesive surface of the plate material 1 is partially blocked, which tends to cause variations in the vibration characteristics of the tone plate, and if the amount of adhesive is small, the plate material 1, There was a disadvantage that the adhesive strength between the two layers decreased, the product was likely to vary, and the yield was poor.

In addition, in this tone plate, since the adhesive area between the plate materials 1 and 1 is small and the adhesive strength between them is weak, as shown in FIG. When one side 3 along the direction is taken as the surface to be hit during performance,
The adhesive portion between the plates 1.1 cracks due to impact during performance, making it easy for the plates 1 and 1 to separate, and there is also the problem that mechanical strength such as impact resistance is weak.

"Means for Solving the Problems" In the sound plate of the present invention, a plurality of plate materials each having reinforcing fibers oriented in one direction and having cavities extending in the same direction as the reinforcing fibers are laminated and integrated. was the solution.

"Function" Since a cavity is formed inside the plate, each outer surface along the longitudinal direction of the cavity of the plate material is a flat surface, so if any of the outer surfaces is used as a joint in lamination, the area can be large Therefore, the plates can be stacked firmly together.

Embodiment FIG. 1 shows an example of a tone plate according to the present invention, and reference numeral 4 in the figure indicates the tone plate according to the present invention. The tone plate 4 is formed by laminating and integrating a plurality of fiber-reinforced resin plate materials (hereinafter abbreviated as plate materials) 5....

The plate material 5 described above is a member having a rectangular cross section in which reinforcing fibers are oriented in one direction and dispersed in a resin matrix.

Long fibers such as glass fibers, carbon fibers, and aramid fibers are used as the reinforcing material, and glass fibers and high-modulus carbon fibers are particularly preferably used. Further, short fibers such as silicon carbide and boron nitride may be used in combination.

In addition, examples of the resin include thermosetting resins such as epoxy resins, unsaturated polyester resins, and phenol resins. Considering the adhesion between the reinforcing fibers and the resin, for example, the above reinforcing fibers may be made of glass fibers. A combination of unsaturated polyester resin, if available, and epoxy resin, if carbon fiber is preferred, is preferred.

The blending amount of the reinforcing fibers is usually 30 to 70% by volume, preferably 50 to 60% by volume. If it is less than 30% by volume, the mechanical reinforcement for the resin will not be sufficient and only a reinforced resin with a low Young's modulus will be obtained. If it exceeds 70% by volume, the wetting of the fibers and resin will deteriorate and a homogeneous reinforced resin will not be obtained. is not obtained. The blending amount and type thereof are appropriately selected so that the Young's modulus of the composition consisting of the resin and the reinforcing fiber is 2000 kg/ax" or more.

A large number of cavities 6 are formed inside the plate material 5. The cavity 6 is formed in the same direction as the orientation direction of the reinforcing #a fibers, and in this example, the cavity 6 is formed in the same direction as the orientation direction of the reinforcing #a fibers, and in this example, the cavity 6 is formed in the same direction as the orientation direction of the reinforcing #a fibers. It is formed parallel to the longitudinal direction of. The cross-sectional shape of the cavity 6 may be any shape other than the round shape shown in FIG. 1, such as a square shape. In addition, the sum of the cross-sectional areas of the cavities 6 in the cross section perpendicular to the longitudinal direction of the plate material 5 is determined within a range of 5 to 60% of the cross-sectional area of the plate material 5 in the same cross section. can be determined by adjusting the cross-sectional area and number of cavities 6 according to the characteristics required of the tone plate 4. If this cross-sectional area ratio is less than 5%, no woody feel will be imparted to the tone color of the tone plate 4, and if it exceeds 60%, there will be an inconvenience that the extension of the sound will deteriorate.

An adhesive is used for laminating and integrating the plate materials 5 described above. Examples of this adhesive include epoxy resin-based adhesives and resorcinol-based adhesives, taking into consideration adhesive strength and small volume change of the adhesive layer after solidification. Further, in order to increase the rigidity of the adhesive layer itself, a glass fiber mat, a carbon fiber mat, etc. may be mixed into the adhesive layer.

Then, a laminate 7 in which the above-mentioned plate materials l... are laminated and integrated.
A rectangular auxiliary plate 8 for adjusting the dimensions of the tone plates 4 is adhesively fixed to one surface perpendicular to the stacking direction.

Next, an example of a method for manufacturing the tone plate 4 having such a configuration will be described.

First, the plate material 5 is manufactured by a pultrusion method.

That is, for example, reinforcing fibers such as glass roving are aligned so that the fiber direction is unidirectional. Then,
The reinforcing fibers aligned in one direction are immersed in, for example, an uncured thermosetting resin solution such as unsaturated epoxy resin to obtain reinforcing fibers impregnated with resin. Here, a peroxide curing agent such as benzoyl peroxide, lauroyl peroxide, or cumene hydroperoxide is added to the above resin (0.
5 to 1.5 parts by weight), a mold release agent such as zinc stearate (1 to affl parts per 100 parts by weight of resin),
For example, it is preferable to mix in advance additives such as a lubricant such as calcium carbonate (5 to 50 parts by weight per 100 parts by weight of the resin).

Next, the above-mentioned resin-impregnated reinforcing fibers are oriented so that the fibers are oriented in one direction, and this is used as a molding precursor.

Next, this shaped precursor is shaped along the fiber orientation direction. The molded material is guided to a cylindrical cavity-forming die elongated in the same direction as described above, and by this cavity-forming die, a large number of cavities 6 are formed inside the molded surface precursor along the molding direction. Next, this molded precursor is guided to an outer shape regulating die having a rectangular cross section, and is pulled out from the molding outlet of this die, and then
Immediately, the material is heated and hardened using a heating die connected to the above-mentioned die, and is formed into a plate material 5 having a rectangular cross section as shown in FIG. Here, the longitudinal direction (
As mentioned above, the total cross-sectional area in the cross-section in the direction perpendicular to the molding direction is in the range of 5 to 60% of the cross-sectional area in the same direction of the plate material 5, but within this range, easy moldability is achieved. In consideration of the above, the cross-sectional area of one cavity 6 is made as large as possible.
It can also be mechanically formed using polar material or the like along its longitudinal direction inside.

Next, as shown in FIG.
shall be. In the laminate 7 of this example, the lamination direction of each plate material 5 is
...The direction is perpendicular to the longitudinal direction, and the reinforcing fibers are oriented in the plate material 5... Both the mechanical strength in the longitudinal direction and the mechanical strength in the lamination direction are excellent. . Next, on one side of the laminate 7 perpendicular to the stacking direction,
A rectangular auxiliary plate material 8 is adhesively fixed. Here, the above-mentioned plate materials 5... are laminated and integrated, and the auxiliary plate material 8 is added to the laminate 7.
As mentioned above, the method using adhesive is suitable for fixing. When bonding in this laminate 7, each plate.

Since the adhesive can be applied to the entire surface of both sides of the materials 5 in the stacking direction, the plates 5 can be firmly laminated to each other.

Next, the other side opposite to the one side 3 of this laminate 7 is hollowed out for tuning, and then the whole is subjected to post-processing such as painting, so that the sound as shown in Fig. 1 is produced. Obtain plate 4. It is desirable that the hit surface of the tone plate 4 be provided in a direction perpendicular to the adhesive layer of the tone plate 4, as shown in FIG.

When the hit surface and the adhesive layer become parallel, when the plate Vf5 with a high elastic modulus bends and deforms, shear deformation concentrates on the adhesive layer with a low elastic modulus, causing the sound of the tone plate 4 to elongate. becomes worse.

The sound mask 4 obtained in this way is contained in fiber-reinforced resin.
Since a large number of cavities 6 are formed extending in the same direction as the orientation direction of the reinforcing fibers, when this is struck,
The tone plate made of fiber-reinforced resin has both the good sound extension of a special Y-cho and the soft, wood-like tone unique to a wooden tone plate.

"Effects of the Invention" As explained above, the onkari of the present invention is made by laminating and integrating a plurality of plate materials in which reinforcing fibers are oriented in one direction and cavities extending in the same direction as the reinforcing fibers are oriented. As a result, the following excellent effects can be obtained.

(1) Since a cavity is formed inside the plate material, each outer surface along the longitudinal direction of the cavity of the plate material is a flat surface. Therefore, the plates can be stacked firmly together. Therefore, since the plate materials are strongly laminated and integrated with each other, the plate materials do not separate from each other due to impact during performance, resulting in excellent mechanical strength such as impact resistance.

[2] If the cavity is formed by pultrusion molding, the cavity can be easily manufactured and the manufacturing cost can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view showing an example of a tone plate of the present invention, Fig. 2 is a schematic configuration diagram showing a plate material used in a tone plate of this invention, and Fig. 3 is a plate material used in a tone plate of this invention. FIG. 4 is a schematic diagram showing an example of a conventional tone plate. 4... Tone plate, 5... Board material (fiber reinforced resin board material),
6...Hollow.

Claims (2)

[Claims] (1) A tone plate comprising a plurality of fiber-reinforced resin plate materials in which reinforcing fibers are oriented in one direction and cavities extending in the same direction as the reinforcing fibers are laminated and integrated. (2) The tone plate according to claim 1, wherein the cavity is formed by pultrusion.