JP2006264063A - Wood processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wood processing method which can make the density of wood to be processed uniform irrespective of its shape and materialize high shape stability after processing. <P>SOLUTION: The wood is deformed into a prescribed three-dimensional shape through the wood processing method comprising a primary compression process in which a liquid pressure by a prescribed liquid is applied to an uncompressed solid material to compress it, a shaping process in which wood is shaped from the solid material compressed in the primary compression process, and a secondary compression process in which the wood shaped in the shaping process is held/compressed by a pair of molds corresponding to the prescribed three-dimensional shape. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wood processing method for processing wood into a predetermined three-dimensional shape.

  In recent years, natural wood has attracted attention. Since wood has a variety of grain, individual differences occur depending on the location of the raw wood, and the individual differences are the individuality of each product. In addition, scratches and changes in color caused by long-term use may also have a unique texture and may be familiar to the user. For these reasons, wood is attracting attention as a material that can produce unique and tasty products that are not found in products using synthetic resins and light metals, and its processing technology is also making dramatic progress.

  Conventionally, as a processing technique for such wood, after compressing a piece of water softened and softened, and cutting the wood substantially parallel to the compression direction to obtain a plate-like primary fixed product, this primary fixed product is heated and absorbed by water. There is known a technique of forming a predetermined three-dimensional shape while performing the process (for example, see Patent Document 1). There is also known a technique in which a piece of wood compressed in a softened state is temporarily fixed with a predetermined mold, and this wood is restored in a mold and molded (for example, see Patent Document 2). ).

Japanese Patent No. 3078452 JP-A-11-77619

  By the way, the fact that there are individual differences in wood means that the shaped wood itself is not homogeneous. For this reason, when shaping | molding wood using the conventional processing technique, depending on the shape which the wood should process, it may be difficult to shape | mold all the parts of wood to a uniform density. In such a case, since many residual stresses are generated in the compressed wood, there is a problem that it is fragile and easily changes with time.

  The present invention has been made in view of the above, and it is possible to make the density of the wood uniform regardless of the shape of the wood to be processed, and to achieve high shape stability after processing. It aims at providing the processing method of.

  In order to solve the above-mentioned problems and achieve the object, the invention according to claim 1 is a method for processing wood into a predetermined three-dimensional shape, wherein a predetermined liquid is applied to an uncompressed solid material. A primary compression step of compressing by applying a hydraulic pressure according to the above, a shaping step of shaping wood from the solid material compressed in the primary compression step, a secondary compression step of compressing the wood shaped in the shaping step, It is characterized by including.

  According to a second aspect of the present invention, in the first aspect of the invention, the secondary compression step is characterized in that the wood is sandwiched and compressed by a pair of molds corresponding to the predetermined three-dimensional shape. .

  According to the wood processing method of the present invention, a primary compression step of compressing a solid material in a non-compressed state by applying a liquid pressure with a predetermined liquid, and a shape of the wood from the solid material compressed in the primary compression step By including the taking step and the secondary compression step of compressing the wood shaped in the shaping step, the density of the wood can be made uniform regardless of the shape of the wood to be processed, It becomes possible to realize high shape stability after processing.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a configuration of a compressed wood product formed by a wood processing method according to an embodiment of the present invention. 2 is a cross-sectional view taken along line AA in FIG. A compressed wood product 1 shown in these two figures has a main plate portion 1a having a substantially rectangular surface, and extends along the longitudinal direction of the main plate portion 1a at a predetermined angle with respect to the main plate portion 1a. One side plate portion 1b and two side plate portions 1c extending along the short direction of the main plate portion 1a and extending at a predetermined angle with respect to the main plate portion 1a are formed in a substantially bowl shape as a whole. The thickness of the compressed wood product 1 is almost uniform. The cross section taken along the line BB in FIG. 1 is substantially the same as the cross section taken along the line AA shown in FIG. 2 except that the dimensions are different.

  Next, a wood processing method according to this embodiment will be described. In the following description, a case where the compressed wood product 1 having the above-described configuration is formed will be described. However, the wood processing method according to this embodiment can be applied to a compressed wood product having another configuration. Needless to say.

  First, a solid material in an uncompressed state is compressed by applying a liquid pressure with a predetermined liquid (oil, water, etc.) (primary compression step). FIG. 3 is an explanatory view schematically showing a cross section of the solid material before applying the hydraulic pressure and a cross section of the solid material after applying the hydraulic pressure in the primary compression step. The solid material 50 shown in the figure has a substantially circular cross section in the uncompressed state (I). In the cross section of the solid material 50, the interval between the wood grains 50G forming the annual rings is different on the left and right sides of the figure. More specifically, the right side of the cross section of the solid material 50 shown in the state (I) is from the left side. In general, the interval of the grain 50G is wide. This is due to the growth environment of the solid wood 50. In the cross section shown in the state (I), the right side faces the south side, and the cell wall becomes faster by receiving more sunlight than the left side facing the north side. The case where it grows is shown. In this case, the right cross section has a larger space between the grain 50G than the left cross section, but since there are more gaps, the density of the right cross section is smaller than the density of the left cross section.

  When a hydraulic pressure is applied to the solid material 50 having the cross-sectional shape described above, a uniform compressive force acts on the surface of the solid material 50. As a result, since the cross section of the solid material 50 ′ after applying the hydraulic pressure is compressed more in the right cross section with many voids, it has an irregular cross section as shown in the state (II). The density inside the solid material 50 ′ is almost uniform.

  After that, from the solid material 50 ′ whose density has become substantially uniform by the primary compression step, a predetermined-shaped wood having a volume obtained by adding in advance a volume reduced by the secondary compression step described later is formed (form Taking process).

  FIG. 4 is an explanatory view schematically showing a situation in which the wood that is the raw material of the compressed wooden product 1 is formed from the solid wood 50 ′. FIG. 4 shows a case where the longitudinal direction of the wood 51 taken from the solid material 50 ′ is shaped so that the fiber direction L of the wood 51 is substantially parallel. What is necessary is just to employ | adopt the optimal thing in consideration of conditions, such as the intensity | strength and the beauty | look which are requested | required of the wood, how to shape wood from the solid wood 50 '. , Does not depend on how to shape such wood. For this reason, when describing the wood 51 and the compressed wood product 1 in the drawings, the grain 50G is omitted.

  In this shaping process, wood whose longitudinal direction is substantially parallel to the fiber direction of the solid material 50 ′ may be shaped into a flat plate shape. In addition, the solid wood 50 used here is an optimum material according to the use of the compressed wood product 1 among cocoons, camellia leaves, paulownia, cedar, pine, cherry blossoms, buds, ebony, teak, mahogany, rosewood, etc. Just choose.

  Following the shaping process described above, the shaped wood 51 is compressed (secondary compression process). In the secondary compression step, the wood 51 is first left in a high-temperature and high-pressure steam atmosphere for a predetermined time. Thereby, the wood 51 absorbs moisture excessively and softens. Thereafter, the wood 51 is sandwiched by a pair of molds in the same water vapor atmosphere as when softened, and a predetermined compressive force is applied to the sandwiched wood 51.

  FIG. 5 is an explanatory diagram showing a situation until the wood 51 is sandwiched between a pair of molds 61 and 71 made of a predetermined metal. 6 is a cross-sectional view taken along the line CC of FIG. As shown in these figures, a mold 61 that applies a compressive force to the wood 51 from above the wood 51 during compression is fitted on the inner surface of the wood 51 that curves from the main plate portion 51a toward the side plate portions 51b and 51c. It has the convex part 62 which makes the shape to match. If the radius of curvature of the inner surface of the curved surface 51ab that curves from the main plate portion 51a to the side plate portion 51b among the inner surfaces of the wood 51 is RI, and the radius of curvature of the curved surface that contacts the curved surface 51ab of the convex portion 62 is RA. There is a relationship of RI> RA between the radii of curvature.

  On the other hand, a mold 71 that applies a compressive force to the wood 51 from below the wood 51 during compression has a recess 72 that fits the curved outer surface rising from the main plate portion 51a of the wood 51 to the side plate portions 51b and 51c. Have. If the curvature radius of the curved surface 51ab outside surface of the wood 51 is RO, and the curvature radius of the curved surface abutting the curved surface 51ab of the recess 72 is RB, the RO is between the two curvature radii. > RB.

  FIG. 7 is a longitudinal sectional view of the state in which the wood 51 is sandwiched and compressed by the pair of molds 61 and 71 having the above-described configuration, with the vertical plane passing through the line C-C in FIG. It is. As shown in FIG. 7, the wood 51 is compressed and deformed into a three-dimensional shape corresponding to the gap between the mold 61 and the mold 71.

  After leaving for a predetermined time in the compressed state shown in FIG. 7, the compressed wooden product 1 is completed by separating the mold 61 and the mold 71 to release the compression and releasing the water vapor atmosphere to dry the wood 51. Finally, the thickness of the compressed wood product 1 becomes substantially equal, and the average value (average compression rate) of the compression rate in the thickness direction of the compressed wood product 1 is about 30 to 50% with respect to the thickness of the wood before compression. Become. Therefore, the total compression ratio after the completion of the two compression steps is about 0.5 to 0.7.

  FIG. 8 is a diagram showing an application example of the compressed wood product 1 formed as described above, and more specifically, a perspective view showing an external configuration of a digital camera having the compressed wood product 1 as an exterior material. is there. The digital camera 100 shown in the figure includes a casing-shaped exterior material formed by combining two cover members 2 and 3 formed by appropriately providing an opening, a notch or the like in the compressed wood product 1. The exterior material includes a control circuit that performs drive control related to imaging processing and the like, a solid-state imaging device such as a CCD and a CMOS, and a microphone and a speaker that perform audio input and output. Various electronic members and optical members are accommodated (not shown).

  FIG. 9 is a perspective view showing a schematic configuration of the cover members 2 and 3. As shown in the figure, the cover members 2 and 3 are obtained by appropriately providing an opening or notch in the compressed wood product 1. Among these, the main plate portion 2 a of the cover member 2 is formed with a cylindrical opening 21 that exposes the imaging unit 4 including the imaging lens and a rectangular parallelepiped opening 22 that exposes the flash 5. The side plate portions 2b and 2c of the cover member 2 are provided with a semi-cylindrical cutout 23 and a rectangular parallelepiped cutout 24, respectively. The thickness of the cover members 2 and 3 is substantially uniform, and the thickness value is more preferably about 1.6 mm.

  On the other hand, the main plate portion 3a of the cover member 3 has a rectangular parallelepiped opening that exposes the display portion 6 that is realized using a liquid crystal display, a plasma display, an organic EL display, or the like to display image information or character information. A portion 31 is formed. The side plate portion 3b of the cover member 3 is provided with a semi-cylindrical cutout 32 that forms an opening 41 that exposes the shutter button 7 in combination with the cutout 23 of the cover member 2. Further, the side plate portion 3c has a notch 33 that forms an opening 42 that exposes an interface for connection to an external device (including a DC input terminal, a USB connection terminal, etc.) in combination with the notch 24 of the cover member 2. Is provided.

  The above-described openings and notches may be formed all together when shaping the raw wood from the solid material 50 ′, or may be formed by cutting, drilling, or the like after the secondary compression step. It should be noted that an opening for attaching the finder and an opening for displaying an input key for receiving an operation instruction signal may be further provided at an appropriate position, or a sound for outputting a sound generated by a speaker inside the exterior material. The output hole may be formed at an appropriate position.

  When the compressed wood product 1 described above is applied as an exterior material for the digital camera 100, the grain and unevenness of the wood on the surface of the exterior material serve as a non-slip, so that the operability of the digital camera 100 can be improved. In this sense, the compressed wood product formed by the wood processing method according to the present embodiment is an electronic device other than a digital camera, for example, a portable communication terminal such as a mobile phone, PHS or PDA, a portable audio device, an IC. It can also be applied to exterior materials for recorders, portable televisions, portable radios, remote controls for various home appliances, digital video, and the like.

  According to the wood processing method according to the embodiment of the present invention described above, compression is performed in a primary compression step of compressing a solid material in an uncompressed state by applying a liquid pressure with a predetermined liquid and the primary compression step. Regardless of the shape of the wood to be processed, including a shaping step for shaping the wood having a predetermined shape from a solid material and a secondary compression step for compressing the wood shaped in the shaping step. The wood can be compressed to a uniform density.

  Further, according to this embodiment, it is possible to reduce the residual stress inside the compressed wood, and to produce a compressed wooden product with high shape stability that is hard to break and hardly changes over time.

  Although the best mode for carrying out the present invention has been described in detail so far, the present invention should not be limited only by the above-described one embodiment. That is, the present invention can include various embodiments and the like not described herein, and various design changes and the like can be made without departing from the technical idea specified by the claims. Is possible.

It is a perspective view which shows the structure of the compression wooden product formed by the processing method of the wood which concerns on one embodiment of this invention. It is the sectional view on the AA line of FIG. It is explanatory drawing which shows the outline | summary of the primary compression process of the processing method of the timber which concerns on one embodiment of this invention. It is explanatory drawing which shows typically the condition which shapes wood from the solid material after a primary compression process. It is explanatory drawing which shows the outline | summary of the secondary compression process of the processing method of the wood which concerns on one embodiment of this invention. It is a longitudinal cross-sectional view which shows the outline | summary of the secondary compression process of the processing method of the wood which concerns on one embodiment of this invention. It is a longitudinal cross-sectional view which shows the state at the time of wood compression in a secondary compression process. It is a perspective view which shows the external appearance structure of the digital camera which applied the compressed wood product of FIG. 1 as an exterior material. It is a perspective view which shows the structure of the cover member which exterior | wraps a digital camera.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressed wood product 2, 3 Cover member 1a, 2a, 3a, 51a Main board part 1b, 1c, 2b, 2c, 3b, 3c, 51b, 51c Side board part 4 Imaging part 5 Flash 6 Display part 7 Shutter button 21, 22, 31 , 41, 42 Opening 50, 50 'Solid wood 50G Wood 51 Wood 51ab Curved surface 61, 71 Mold 62 Convex 72 Concave 100 Digital camera

Claims (2)

A wood processing method for processing wood into a predetermined three-dimensional shape,
A primary compression step of compressing a solid material in an uncompressed state by applying a liquid pressure by a predetermined liquid;
A shaping process for shaping wood from the solid material compressed in the primary compression process;
A secondary compression step of compressing the wood shaped in the shaping step;
The processing method of the wood characterized by including. The secondary compression step includes
The wood processing method according to claim 1, wherein the wood is sandwiched and compressed by a pair of molds corresponding to the predetermined three-dimensional shape.

Images