JPH0213105B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a building board that has a design appearance full of three-dimensionality and solidity and has excellent sound absorption properties, and a method for manufacturing the same.

Traditionally, decorative boards with uneven patterns on the surface by spray painting or embossing have been widely known, but with such processing methods, the height of the protrusions is relatively low and it can be easily seen from a distance. When viewed, the entire surface is flattened and there is no three-dimensional effect.Furthermore, the bottom of the uneven pattern is completely exposed, so it lacks depth and lacks a design appearance.

On the other hand, as building boards having sound absorbing properties, there are known building boards in which a large number of small holes or travertine-patterned recesses are provided in a porous board such as a soft fiber board or a rock wool board.

However, although this structure differs depending on the material of the building board and the shape of the small holes or recesses, in general, even if it has sound absorption properties from mid to high frequencies, it has very poor sound absorption properties in the low frequency range. Furthermore, since the small holes and recesses are extremely small, they have a flat appearance with no depth and lack a three-dimensional effect, as described above.

The present invention has been made in view of the above problems, and is a closure having a dovetail groove shape in cross section, which is narrower on the surface side and wider on the inner side as you move from the surface to the inside of the plate-shaped base material. A building board formed with an annular groove and a method for manufacturing the same are provided.

Embodiments of the present invention will be explained with reference to the drawings: 1
is a plate-like base material about 1 to 2 cm thick made of vegetable fiberboard, mineral fiberboard, or other suitable material, and the planar shape is circular, rectangular, polygonal, or other suitable shape on the surface side. And the depth is 1/2 of the thickness of the plate-shaped base material 1
A plurality of closed annular grooves 2, 2, .

These grooves 2 are composed of a narrow groove portion 3 that opens on the surface side of the plate-like base material 1, and a wide groove portion 4 that is cut into the inside of the plate-like base material 1 and communicates with the narrow width groove portion 3. It has a dovetail groove shape in cross section, and the groove width of the narrow groove portion 3 is formed to be approximately equal to or slightly smaller than the thickness of the plate-like base material 1 to enhance sound absorption and three-dimensional effect. Also, the width of the internal widening groove 4 is approximately the width of the narrow width groove 3 on the opening side.
It is 1.3 to 2.0 times.

Furthermore, the internal widening groove part 4 is provided along the shape of the narrow width groove part 3, but the width direction thereof may be such that the lower end of the both side wall surfaces of the narrow width groove part 3 is widened to both sides. It may be formed by widening only the lower end of one side wall surface.

Moreover, a closed annular groove 2 consisting of these groove parts 3 and 4
The groove width does not necessarily need to be the same over its entire circumference, and may be varied.

5 is an island-shaped protrusion surrounded by the closed annular groove 2; This protrusion 5 does not necessarily need to be formed flush with the surface of the plate-like object, and may be formed below the surface of the plate-like object.

Next, to describe the manufacturing method of such a building board, first, a rotary blade 6 such as a router having the same diameter as the width of the narrow groove portion 3 is rotated at an appropriate position on the surface of the plate-like base material 1 to create a desired depth. After drilling a hole with the same depth as the groove 2, as shown in FIG.
The closed annular groove 2 is excavated while moving in the planar direction of the plate-shaped base material 1 to draw an appropriate trajectory such as a circular shape or a rectangular shape.

Next, a rotary blade 6' having a blade height smaller than the depth of the annular groove 2 and a blade wider than the shaft at the lower end of the shaft is inserted into the annular groove 2, and the rotary shaft 7 is inserted into the annular groove 2.
By shifting the groove width inward or outward from the groove width center line, the inside of the groove is expanded laterally, and in this state, by moving the rotary blade 6' along the groove 2, the narrow groove portion 3 on the front surface side is expanded. A wide groove portion 4 is cut inside the groove.

During this cutting, it is also possible to move the rotary blade 6' parallel to the narrow groove 3 with the shaft 7 of the rotary blade 6' being shifted from the center of the narrow groove 3 on the front side to the other side. For example, as shown in FIGS. 1 to 3, wide groove portions 4 are expanded from the lower ends of both side walls of the narrow groove portion 3 to both sides.
can be obtained.

Note that the wide groove portion 4 may be cut during excavation of the groove 2, that is, the narrow groove portion 3.

In addition, in order to excavate such a closed annular groove 2 having a dovetail-shaped cross section, a deep narrow groove portion 3 is appropriately excavated in advance using a rotary blade having an appropriate thickness (height), and then a wide groove portion is excavated. The widening groove portion 4 may be excavated by bringing a rotating blade having the same height and thickness as the groove bottom into contact with the bottom of the groove, and rotating the blade while shifting its axis from the center of the groove to one side, as described above. Further, the closed annular groove 2 may be excavated at once using a cutter having a small diameter blade for excavating a narrow width groove and a large diameter blade for excavating a wide width groove, which are integrally arranged vertically. In this case, as shown in Fig. 5, a slot 8 having the same diameter as the large-diameter blade is obtained at the starting part of the excavation, and from the slot 8 a groove is formed which is narrow at the top and wide at the bottom. Ru.

As described above, the building board of the present invention has a plate-like base material,
Because it is made by carving a closed annular groove with a narrow opening groove width on the surface side and a wide internal groove width, it has a deep and solid feel that cannot be achieved with conventional architectural boards such as ceiling panels. Moreover, since the internal groove is wide, it gives a sense of depth even when viewed directly from an oblique direction, giving it an extremely three-dimensional effect.Furthermore, the shape and size of the closed annular groove make it easier to design. It has an excellent appearance.

Furthermore, the narrow groove on the surface side and the widened groove on the inside form a dovetail groove shape in cross section to provide a similar effect to a Helmholtz resonator and muffle sound waves in a specific range of frequencies, especially in the low frequency range. It is possible,
Moreover, sounds of other frequencies can be absorbed by being diffusely reflected within the wide groove, and especially when porous materials such as soft fiberboard or rock wool board are used as the plate-like base material, the sound absorption effect is reduced. It is tall and ideal for ceiling panels and interior materials in music rooms, etc.
In addition, the sound waves to be absorbed propagate toward the building board from all directions, but the grooves of the present invention are closed annular and open evenly in all directions in the longitudinal grooves as shown in Figure 1. Firstly, the sound waves are absorbed evenly in the vertical and horizontal directions, and secondly, the sound absorbed by the closed annular groove is trapped and does not leak outside, but only in one direction. It has the advantage that it has a superior sound absorption effect compared to building boards with grooves and open ends.

The method of the present invention also includes: excavating an internal widening groove portion of a closed annular groove of a desired depth in a plate-shaped base material using a rotary blade;
Since the groove width and the internal widening groove part can be formed large and in any shape, in addition,
It is possible to easily excavate with a rotary blade, and depending on the size of the rotary blade and the direction of movement, a wide variety of annular grooves can be formed, making it possible to obtain building boards with excellent sound absorption and design. be.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a plan view thereof, Fig. 2 is a longitudinal front view, Fig. 3 is a partially cutaway enlarged perspective view, and Figs. 4 and 5 show annular groove formation. FIG. 3 is a simplified plan view showing the state. DESCRIPTION OF SYMBOLS 1... Plate base material, 2... Closed annular groove, 3... Narrow width groove part, 4... Widening groove part, 6... Rotating blade.

Claims (1)

[Scope of Claims] 1. A building board formed by cutting a closed annular groove having a narrow opening groove width on the surface side and a wide groove width inside the plate-shaped base material. 2. The building board according to claim 1, wherein the internal widening groove portion expands only in one direction from one side wall surface of the narrow groove portion on the front side. 3. The building board according to claim 1, wherein the internal widening groove portion expands in both directions from both side wall surfaces of the narrow groove portion on the front side. 4. A method for manufacturing a building board, which comprises excavating and forming a closed annular groove of a desired depth and an internal widening groove portion of the groove using a wide rotary blade provided at the lower end of a shaft in a plate-shaped base material. 5. The inner bottom widening groove is moved by moving the rotary blade along the narrow groove with a fixed dimension shifted toward the side wall of the narrow groove with respect to the width center of the narrow groove opening on the surface of the plate-shaped base material. 5. The method for manufacturing a building board according to claim 4, which comprises excavating.