JPH0748895A - Manufacture of sound absorbing construction board - Google Patents

Abstract

PURPOSE:To provide a sound absorbing construction board excellent in a sound absorbing property and having an appearance brimmed with stereoscopic feeling and massive feeling. CONSTITUTION:An opening section 3 having the opening width larger than the thickness of a plate-like base material 1 is bored to the proper depth on the surface of the plate-like base material 1, the outer periphery of the inner bottom section of the opening section 3 is expanded and bored outward over the whole periphery by a rotary edge 5, and a circular expanded space section 4 communicated with the opening section 3 is formed. The opening sections 3 having the circular expanded space sections 4 are bored and formed at the prescribed interval in the horizontal and vertical directions on the plate-like base material 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a sound-absorbing building board which is excellent in sound absorption and has a design appearance that is full of three-dimensional and profound feeling.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a building board having a sound absorbing property, a plate in which a large number of projections such as pins are planted is used, and the plate is a porous board such as a soft fiber board or a rock wool board. It is generally known to provide a large number of small holes or travertine pattern-shaped recesses by pressing or rubbing the surface.

[0003]

However, in the formation of the sound absorbing holes by the projections such as the pins as described above, it generally depends on the material of the building board and the shape of the small holes or the recesses, but generally in the middle to high range. Even if it has sound absorption, only building boards with extremely low sound absorption in the low frequency range can be obtained, and since the small holes and recesses are extremely small in diameter, it has a flat appearance without any depth. In addition, it had a poor three-dimensional effect, and when used with a ceiling plate, its pores and recesses could not be clearly revealed, and it had poor cosmetic properties. An object of the present invention is to provide a method for manufacturing a sound absorbing building board that can solve such problems.

[0004]

In order to achieve the above object, a method of manufacturing a sound-absorbing building board according to the present invention is directed to a surface of a plate-shaped base material at a predetermined depth and a predetermined shape at appropriate intervals vertically and horizontally. And the inner bottom portion of the opening is enlarged to the outer periphery over the entire circumference by a rotary blade to form an annular enlarged space portion having a constant shape having a larger planar shape than the opening.

[0005]

Since the inner bottom portion of the surface opening is enlarged in the outer peripheral direction to form the annular enlarged space portion communicating with the inner bottom portion of the opening portion, the section becomes a flat vase shape and the frequency within a specific range,
In particular, it is possible to obtain a building board that has a sound deadening effect similar to that of the Helmholtz resonator to sound waves in the low frequency range, and diffuses sound with other frequencies in the annular expansion space to absorb sound.

Further, the annular enlarged space portion is larger than the opening portion by the rotary blade and can be easily excavated into a desired shape, and the space recess which is varied depending on the size of the rotary blade and the way of taking the movement trajectory is cut. To be done. Further, the width of the opening is formed to be larger than the thickness of the plate-shaped base material, and a large annular expansion space is formed so as to communicate with the inner bottom of the opening, which gives a deep and solid feeling. In addition, it is possible to obtain a building board that has a depth feeling even when viewed directly from an oblique direction, is rich in three-dimensionality, and has an excellent appearance in terms of design.

[0007]

EXAMPLE An example of the present invention will now be described with reference to the drawings. As shown in FIG. 1, a plant fiberboard, a mineral fiberboard or other suitable plate-shaped material having a thickness of about 2 to 3 cm is used. With the rotary blade 5 such as a router having a certain thickness on the plate-shaped base material 1, the opening 3 of the semi-through hole 2 whose opening width is larger than the thickness of the plate-shaped base material 1 is made smaller than the thickness of the rotary blade 5. Also, excavation 6 is performed until reaching a large depth, preferably two-thirds or more of the thickness of the plate-shaped substrate 1.

In this case, if the rotary blade 5 is rotated without moving the shaft 9 of the rotary blade 5 in the plane direction, the opening 3 formed of a circular hole having the same diameter as that of the rotary blade 5. If the shaft 9 is moved along the surface of the plate-shaped substrate 1 in a plane direction so as to draw a circular locus of a certain radius or an appropriate shape, a circular hole or a square of a desired size can be obtained. It is possible to excavate the opening 3 having an appropriate planar shape such as.

In this way, after excavating the excavation hole 6 having the opening 3 having a desired shape to a depth larger than the thickness of the rotary blade 5, a trajectory along the shape of the opening 3 or a trajectory of an appropriate shape is formed. By moving the inner wall of the excavation hole 6 having the opening 3 in the closed annular shape in the plane direction as illustrated, the peripheral wall of the inner bottom portion is expanded and excavated toward the outer periphery, and the annular expansion space 4 having a larger planar shape than the opening 3. Is formed. The opening 1 may be excavated by a laser beam or the like other than the rotary blade 5.

An opening 3 opened on the surface of the plate-shaped substrate 1 and an annular shape communicating with the opening 3 and formed on the outer periphery of the inner bottom of the opening 3 inside the plate-shaped substrate 1. The semi-through hole 2 including the expanded space portion 4 is formed in the plate-shaped substrate 1 by repeating the above-mentioned cutting process at predetermined intervals in the vertical and horizontal directions, and the sound-absorbing building board as shown in FIGS. 2 to 4. Is manufactured.

The opening 3 of the semi-through hole 2 and the annular enlarged space portion 4 are formed in a circular shape in the plan view, but as shown in FIG. Both the hole 2, the opening 3 and the annular expansion space 4 may be combined with a rectangular planar shape, and one of the opening 3 and the annular expansion space 4 may be circular and the other may be rectangular. It may also be formed into
Various shapes such as a polygon may be adopted in consideration of design.

In the figure, 7 is an inclined end surface formed by expanding the opening edge of the opening 3 in a trumpet shape, and 8 is a plate-shaped substrate 1 which is partitioned between adjacent semi-through holes 2 and 2. It is a groove that was excavated in a joint shape on the surface of.

[0013]

As described above, according to the method for manufacturing a sound-absorbing building board of the present invention, openings having a predetermined depth and a predetermined shape are formed on the surface of the plate-shaped base material at appropriate intervals vertically and horizontally. ,
Since the inner bottom portion of the opening is expanded to the outer periphery by the rotary blade over the entire circumference to form an annular expansion space having a constant shape having a larger planar shape than the opening, the opening and the annular expansion are formed. The space part can be formed in a large and arbitrary shape, and the annular enlarged space part can be continuously excavated from these openings by the rotary blade, and further, it changes depending on the size of the rotary blade and the way of taking the movement trajectory. It is possible to form an opening having a rich shape and an annular expansion space.

Further, as described above, since the opening and the inner bottom portion of the opening are enlarged in the outer peripheral direction to form the annular enlarged space portion communicating with the opening, the whole cross section has a flat vase shape. Thus, a building board is obtained which has a sound deadening effect similar to that of a Helmholtz resonator to a specific range of frequencies, particularly sound waves in the low frequency range, and causes sound of other frequencies to be diffusely reflected in the annular expansion space to absorb sound. It is possible to significantly improve the sound absorption in the low frequency range compared to a conventional building board in which a large number of small holes or travertine pattern-shaped recesses are provided in a porous board such as a soft fiber board or rock wool board, In addition, the sound absorption has no directionality and can absorb sound evenly from any direction, and it is possible to provide a sound-absorbing building board that is optimal as a ceiling plate or interior material for a music room or the like.

Furthermore, the width of the opening is formed large,
Since an annular enlarged space having a planar shape larger than the opening is formed to communicate with the inner bottom portion of the opening, a deep and solid feeling is given and a depth feeling is obtained even when viewed directly from an oblique direction. Thus, it is possible to obtain a building board that is rich in three-dimensionality and has an excellent appearance in terms of design.

In addition, since the opening formed from the surface of the plate-shaped substrate to the desired depth has a large opening width, a large excavation hole shape completely different from the conventional small hole or travertine pattern described above. Each of these openings provided in the vertical and horizontal directions remarkably appears and becomes a large pattern, giving a deep and profound feeling, and when used as a ceiling board, The opening is clearly visible and has an excellent appearance in terms of design.

[Brief description of drawings]

FIG. 1 is a simplified plan view showing a manufacturing method,

FIG. 2 is a plan view of the manufactured sound absorbing building board,

FIG. 3 is a vertical sectional front view thereof,

FIG. 4 is a partially cutaway enlarged perspective view thereof,

FIG. 5 is a plan view showing another embodiment of the manufactured sound absorbing building board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plate-shaped base material 2 Half through hole 3 Opening part 4 Annular expansion space part 5 Rotating blade 6 Excavation hole 9 Rotating shaft

Claims (4)

[Claims] 1. An opening having a predetermined depth and a predetermined shape is formed on the surface of a plate-shaped substrate at appropriate intervals vertically and horizontally, and
Manufacture of a sound-absorbing building board, characterized in that an inner bottom portion of the opening is expanded to the outer periphery over the entire circumference by a rotary blade to form an annular expanded space having a constant shape having a larger planar shape than the opening. Method. 2. The sound absorbing building board according to claim 1, wherein the opening is excavated by rotating the rotary blade while fixing or moving the axis of the rotary blade such as a router so as to draw an arbitrary trajectory. Production method. 3. The method for manufacturing a sound-absorbing building board according to claim 1, wherein the annular enlarged space portion is cut by moving a shaft of a rotary blade within a shape range of the opening portion. 4. The production of a sound-absorbing building board according to claim 1, wherein the annular enlarged space portion is cut by moving a rotary blade along an arbitrary locus different from the shape of the opening. Method.