CN102632523A - Solid-wood metallic fabric composite soundboard - Google Patents

Abstract

The solid wood metal mesh composite soundboard belongs to a musical instrument soundboard; The upper layer of metal mesh in the middle, the lower layer of metal mesh sandwiched between the lower surface board and the core board; this composite sound plate not only improves the vibration propagation speed in the direction of the transverse grain of the wood, but also improves the vibration uniformity of the whole sound board, and is compatible with Compared with carbon fiber soundboard, it has better vibration tone and vibration sensitivity.

Description

Solid wood metal mesh composite soundboard

technical field

A solid wood metal mesh composite soundboard belongs to a musical instrument soundboard, in particular to a piano soundboard.

Background technique

The resonant soundboard is an important part of the piano, which can resonate, beautify and radiate the vibrating sound of the strings. The solid wood soundboard or three-layer solid wood composite soundboard of a traditional piano, due to the anisotropic characteristics of wood, that is, the vibration propagation velocity in the direction of the transverse grain of the wood is much smaller than that in the direction of the grain, this characteristic causes the soundboard to vibrate evenly Sexual decline. Although the ribs in the piano soundboard are mainly used to enhance the mechanical strength of the soundboard, which can improve the vibration propagation characteristics of the wood transverse grain direction to a certain extent, but the vibration propagation speed of the sound in the transverse grain direction is still much smaller than the vibration along the grain direction. transmission speed. At present, people have developed a carbon fiber material soundboard. Although the vibration difference in different directions of the soundboard can be reduced, there is a large gap between the sound quality and the solid wood soundboard or solid wood composite soundboard.

Contents of the invention

In view of the above-mentioned problems in the prior art, the present invention provides a solid wood metal mesh composite sound board, which can not only improve the uniformity of vibration transmission found in each sound board, but also improve the dimensional stability of the sound board And pronunciation effect stability.

The purpose of the present invention is achieved like this:

A solid wood metal mesh composite sound board, including an upper surface plate 3a, a lower surface plate 3b, and a core plate 1 sandwiched between the upper surface plate 3a and the lower surface plate 3b, and also includes a core plate 1 sandwiched between the upper surface plate 3a and the core plate 1 The upper metal mesh cloth 2a in the middle, and the lower metal mesh cloth 2b sandwiched between the lower surface plate 3b and the core plate 1.

The above-mentioned solid wood metal mesh composite soundboard, the upper surface plate 3a, the upper metal mesh cloth 2a, the core board 1, the lower layer metal mesh cloth 2b and the lower surface plate 3b are glued together.

The above-mentioned solid wood metal mesh composite soundboard, the upper surface plate 3a and the lower surface plate 3b are spliced by quarter-cut spruce wood veneers at an inclination angle of 35-60° to the long side of the soundboard.

The core board 1 is spliced by spruce, fir, basswood or paulownia wood slats according to the grain direction perpendicular to the long side of the sound board, parallel or oblique.

For the solid wood metal mesh composite soundboard, the long-axis wire direction of the upper layer metal mesh cloth 2a and the lower layer metal mesh cloth 2b forms an angle of 30-60° with the grain direction of the upper surface plate 3a and the lower surface plate 3b.

Metal mesh cloth is woven by metal wire through twill or plain weave. The diameter of the metal wire is 0.025-0.5mm, and the diameter of the mesh is 0.05-0.5mm.

For the solid wood metal mesh composite soundboard, the thickness of the upper surface plate 3a is 0.5-1.5cm; the thickness of the lower surface plate 3b is 0.5-1.5cm.

For the solid wood metal mesh composite sound board, the thickness of the core board 1 is 5.0-8.0 cm.

Compared with the prior art, the composite soundboard of the present invention adds an upper layer of metal mesh sandwiched between the upper surface plate and the core plate, and a lower layer of metal mesh sandwiched between the lower surface plate and the core plate. This design makes this The invention not only improves the vibration transmission speed in the transverse grain direction of wood, improves the vibration uniformity of the whole soundboard, but also has better vibration timbre and vibration sensitivity than the carbon fiber board soundboard.

Metal materials have the following advantages:

1. Metal materials are isotropic, and the sound transmission performance in different directions is the same. The sound transmission speeds of several metal materials are shown in the table below. Compared with wood, it can be seen that the sound transmission speed of metal materials is consistent with the direction along the grain of wood. Close to, but much larger than, the transverse grain direction of the wood.

the

2. The water resistance of metal materials is high, and there is almost no phenomenon of drying shrinkage and wet expansion.

The disadvantages of wood itself are as follows:

1. Wood has great anisotropy, and the elastic modulus of the along-grain and cross-grain directions is very different. For example, in the fish scale spruce wood in the table, the elastic modulus of the along-grain is 11.55GPa, while the cross-grain is only 0.26 GPa;

  

2. Wood has the characteristic of shrinking when it dries and expanding when it is wet, and the shrinkage and swelling rates in different directions are very different. This is also the reason why the soundboard is easy to crack. The following table lists the shrinkage rates of several kinds of wood. It can be seen from the table that there is a big difference between the radial and chord shrinkage of wood;

 

The advantages of this patent:

Through the composite of solid wood and metal mesh, the performance of the following aspects of the wooden soundboard can be improved:

1. It can improve the propagation speed of sound vibration in the direction of wood transverse grain: the propagation speed of sound vibration in the direction of transverse grain of wood is much lower than that of wood in the direction of grain. The vibration propagation velocity in the grain direction and the vibration propagation velocity in the transverse grain direction increased from less than 1000m/s to more than 1500m/s, an increase of 0.7~1.5 times. Greatly improved the vibration sensitivity and uniformity of the soundboard.

2. It can improve the dimensional stability of the soundboard and reduce the risk of cracking of the soundboard: due to the high water resistance of the metal mesh material, its size hardly changes with the temperature and humidity of the external environment, which limits the soundboard to a large extent. Deformation and cracking of the timber portion of the board. With the change of air temperature and humidity, the deformation of the solid wood metal mesh composite soundboard in the transverse grain direction is only 1/4~1/3 of the solid wood soundboard and the three-layer solid wood composite soundboard.

Description of drawings

Figure 1 is a structural schematic diagram of a solid wood metal mesh composite soundboard.

Fig. 2 is a schematic diagram of the wood veneer splicing structure of the upper surface or the lower surface, in which the oblique line is the connecting seam between two adjacent veneers.

Fig. 3 is a schematic diagram of the structure of plain weave metal mesh cloth.

Fig. 4 is a schematic diagram of the structure of the twill weave metal mesh cloth.

In the figure: 1 core plate, 2a upper layer metal mesh cloth, 2b lower layer metal mesh cloth, 3a upper surface plate, 3b lower surface plate, 4 is long-axis metal wire; 5 is short-axis metal wire.

Detailed ways

The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Embodiment one:

A solid wood metal mesh composite soundboard, referring to Figure 1, it includes an upper surface plate 3a, a lower surface plate 3b, and a core board 1 sandwiched between the upper surface plate 3a and the lower surface plate 3b, and also includes a core plate sandwiched between the upper surface plate 3a and the upper layer of metal mesh cloth 2a between the core board 1, and the lower layer of metal mesh cloth 2b sandwiched between the lower surface board 3b and the core board 1, the metal mesh cloth is woven by metal wire through twill or plain weave, as shown in Figure 3 and Figure 3. As shown in 4, 1 is the long-axis metal wire; 2 is the short-axis metal wire, and the diameter of the metal wire is 0.025-0.5mm; Φ is the weaving aperture, and the mesh diameter Φ is 0.05-0.5mm; The mesh cloth 2a, the core board 1, the lower metal mesh cloth 2b and the lower surface plate 3b are glued together; wherein, the upper surface plate 3a and the lower surface plate 3b are spliced by quarter-cut spruce wood veneers As shown in Figure 2, the direction of their texture is the same, and they all form an angle of 35-60° counterclockwise with the long side of the soundboard. As shown in Figure 2, the x direction is the long side direction of the soundboard; the y direction is the short side direction of the soundboard; φ =35~60°.

The core board 1 is spliced by 10cm wide spruce wood slats according to the direction of its grain perpendicular to the long side of the sound board; 3a and the grain direction of the lower surface plate 3b form an included angle of 50°.

Among the five-layer boards that constitute the solid wood carbon fiber cloth composite sound board, the thickness of the upper surface plate 3a and the lower surface plate 3b are the same, which is 1.0cm; the thickness of the core plate 1 is 6.0cm; the upper layer of metal mesh cloth 2a and the lower layer of metal mesh cloth 2b The specifications and materials are the same.

Embodiment 2: The wood veneers of the upper table and the lower table are kept at an inclination angle of 40° to the long side of the sound board, and the core board is made of fir wood laths in a manner parallel to the long side of the sound board according to its grain direction Splicing, the long-axis wire direction of the upper metal mesh cloth and the texture direction of the upper surface form an angle of 35°, and the long-axis wire direction of the lower metal mesh cloth forms a 35° angle with the grain direction of the lower surface plate Included angle, metal mesh cloth is woven by metal wire through twill, the diameter of the metal wire is 0.03mm, and the diameter of the mesh is 0.06mm. The thickness of the upper surface plate and the lower surface plate is 0.6cm, and the thickness of the core plate is 5.5cm.

Embodiment 3: The wood veneers of the upper table and the lower table are kept at an inclination angle of 45° with the long side of the sound board, and the core board is spliced by basswood slats in a way that the grain direction is perpendicular to the long side of the sound board. In this way, the long-axis wire direction of the upper metal mesh cloth forms an included angle of 40° with the grain direction of the upper surface plate, and the long-axis wire direction of the lower metal mesh cloth forms an included angle of 40° with the grain direction of the lower surface plate. , the metal mesh cloth is woven by metal wire through plain weave, the diameter of the metal wire is 0.1mm, the diameter of the mesh is 0.1mm, the thickness of the upper table and the lower table is 0.8cm, and the core board The thickness is 6.0cm.

Embodiment 4: The wood veneers of the upper table and the lower table are kept at an inclination angle of 50° with the long side of the sound board, and the core board is spliced by paulownia wood slats according to the grain direction and the long side of the sound board at an acute angle. Forming, the long-axis wire direction of the upper metal mesh cloth and the grain direction of the upper table form an angle of 45°, the long-axis wire direction of the lower metal mesh cloth and the grain direction of the lower table form a 45° angle Corner, the metal mesh cloth is woven by metal wire through twill, the diameter of the metal wire is 0.2mm, the diameter of the mesh is 0.2mm, the thickness of the upper table and the lower table is 1.1cm, and the core The plate thickness is 6.5 cm.

Embodiment 5: The wood veneers of the upper table and the lower table are kept at an inclination angle of 55° with the long side of the sound board, and the core board is made of spruce wood laths parallel to the long side of the sound board according to its grain direction Spliced together, the long-axis wire direction of the upper metal mesh and the grain direction of the upper surface form an included angle of 50°, and the long-axis wire direction of the lower metal mesh cloth forms an angle of 50° with the grain direction of the lower surface. ° included angle, the metal mesh cloth is woven by metal wire through twill or plain weave, the diameter of the metal wire is 0.3mm, the diameter of the mesh is 0.3mm, and the thickness of the upper and lower boards is 1.3cm. The thickness of the core plate is 7.0cm.

Embodiment 6: The wood veneers of the upper surface board and the lower surface board maintain an inclination angle of 58° with the long side of the sound board, and the long-axis wire direction of the upper metal mesh cloth and the grain direction of the upper surface board The angle between the long axis wire of the lower layer metal mesh and the grain direction of the lower surface is 55°. The metal mesh is woven by metal wire through twill weave or plain weave, and the diameter of the metal wire is 0.4 mm, the mesh diameter is 0.4mm, the thickness of the upper surface plate and the lower surface plate is 1.0cm, and the thickness of the core plate is 7.5cm.

Embodiment 7: The wood veneers of the upper surface board and the lower surface board maintain an inclination angle of 56° with the long side of the sound board, and the long-axis wire direction of the upper metal mesh cloth and the grain direction of the upper surface board The angle between the long axis wire of the lower metal mesh and the texture direction of the lower panel is 32°. The metal mesh is woven by metal wire through twill or plain weave, and the diameter of the metal wire is 0.45 mm, the mesh diameter is 0.45mm. The thickness of the upper surface plate and the lower surface plate is 1.4cm, and the thickness of the core plate is 7.9cm.

Embodiment 8: The wood veneers of the upper surface board and the lower table board maintain an inclination angle of 37° with the long side of the sound board. The angle of the long axis wire of the lower layer of metal mesh is 58° with the texture direction of the lower surface plate. The metal mesh is woven by metal wire through twill weave or plain weave, and the diameter of the metal wire is 0.08 mm, the mesh diameter is 0.06mm, the thickness of the upper surface plate and the lower surface plate is 0.5cm, and the thickness of the core plate is 5.1cm.

Claims (8)

1. solid wood metal screen cloth Complex soundboard; Comprise dash board (3a), descend dash board (3b) and be clipped in dash board (3a) and the central layer (1) of following dash board (3b) centre; It is characterized in that also comprising being clipped in dash board (3a) and the middle upper strata metal screen cloth (2a) of central layer (1), be clipped in down the middle lower metal screen cloth (2b) of dash board (3b) and central layer (1).

2. solid wood metal screen cloth Complex soundboard according to claim 1 is characterized in that described going up is glue couplet bonding between dash board (3a), upper strata metal screen cloth (2a), central layer (1), lower metal screen cloth (2b) and the following dash board (3b).

3. solid wood metal screen cloth Complex soundboard according to claim 1 is characterized in that said metal screen cloth is woven through twill or plain weave mode by wire to form that diameter wiry is 0.025-0.5mm, and mesh diameter is 0.05-0.5mm.

4. solid wood metal screen cloth Complex soundboard according to claim 1 is characterized in that described upward dash board (3a) and following dash board (3b) are spliced by the angle of inclination with 35 ~ 60 ° of soundboard long limit maintenances respectively by quarter sawing Picea genera wood veneer.

5. solid wood metal screen cloth Complex soundboard according to claim 1 is characterized in that said central layer (1) is spliced by the long perpendicular mode in limit of its grain direction and soundboard or parallel mode or oblique mode by Picea, Abies, linden or paulownia wood lath.

6. according to any described solid wood metal screen cloth Complex soundboard of claim 1 to 5, it is characterized in that the major axis metal wire square of described upper strata metal screen cloth (2a) and lower metal screen cloth (2b) becomes 30-60 ° of angle to the grain direction with last dash board (3a) and following dash board (3b).

7. according to any described solid wood metal screen cloth Complex soundboard of claim 1 to 5, it is characterized in that the described thickness of going up dash board (3a) is 0.5-1.5cm; The thickness of following dash board (3b) is 0.5-1.5cm.

8. according to any described solid wood metal screen cloth Complex soundboard of claim 1 to 5, it is characterized in that described central layer (1) thickness is 5.0-8.0cm.

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