JP3059982B2 - Processing method of bent wood - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing bent wood used for furniture, building materials, musical instruments and the like.

[0002]

2. Description of the Related Art Bent wood, which has a unique form of wood in a soft form consisting of curves, can be made light and elegant, and is widely used in furniture, building materials, musical instruments, and the like.

Conventionally, the above-mentioned bending wood is generally processed by using a high-frequency bending wood apparatus as follows. That is, the wood is steamed with steam for about one hour to soften it,
This is bent into a desired bent tree shape using a high-frequency bending wood device, and then fixed to a mold and dried for 1 to 2 weeks.

[0004]

However, in the processing of bent wood using a high-frequency bending wood apparatus as in the prior art, deformation due to press forming cannot be completely fixed. There is a problem that deformation returns and the shape of bent wood changes, and furthermore, wood is steamed with steam for about 1 hour to soften, bent by high frequency bending wood apparatus, and dried for 1 to 2 weeks. Therefore, there is a problem that a very long processing time and a plurality of steps are required, and the running cost is extremely high.

[0005] The present invention has been proposed in view of the above problems, and has as its object to maintain the shape of a bent tree permanently, to significantly reduce processing time and to achieve a single process.

[0006]

According to the present invention, in order to achieve the above object, when processing bent wood, a mechanical compression force is applied to the interior of the high-temperature and high-pressure vessel to convert the wood into the desired bent wood shape. Equipped with a bending machine for bending, and after the wood is subjected to steam treatment with high-temperature and high-pressure steam in a high-temperature and high-pressure vessel to be heated and softened, the wood is bent into the desired bent tree shape by the bending machine. In addition, the present invention provides a method of processing a bent tree in which the bending deformation is fixed in a high-temperature and high-pressure container while the bending deformation is kept in a bent state.

[0007]

[0008]

[0009]

According to the present invention, wood is subjected to steam treatment with high-temperature and high-pressure steam inside a high-temperature and high-pressure vessel, so that the wood absorbs high-temperature and high-pressure steam by the steam pressure to increase the internal temperature. Heat softens over time. In addition, the wood is further subjected to steam treatment with high-temperature and high-pressure steam inside the high-temperature and high-pressure container while being bent, so that the wood undergoes a chemical change due to the high-temperature and high-pressure steam and the bending deformation caused by the bending is fixed. However, the bending deformation due to the bending process does not return due to the subsequent heating or water absorption.

FIG. 1 is a schematic overall view showing an example of an apparatus for carrying out the method of the present invention, wherein 1 is wood, 2 is a high-temperature and high-pressure vessel, and 3 is a bending apparatus.

FIG. 1 is a schematic overall view showing an example of an apparatus for carrying out the method of the present invention, in which 1 is wood, 2 is a high-temperature and high-pressure vessel, and 3 is a bent wood forming press.

The high-temperature and high-pressure container 2 is made of a bottomed cylinder made of high-strength steel or stainless steel to withstand high-temperature and high-pressure, and a lid 4 is hermetically attached to its opening so as to be opened and closed. . The high-temperature and high-pressure vessel 2 has a high temperature (100 to 200 ° C.) through a pipe 5 and a high pressure (1.2 to 25 kg / c).
m ² ) is supplied to the inside, and the drain and the like inside are discharged to the outside through the pipe 6.

The bending apparatus 3 comprises a bending die 7 for bending the wood 1 and a pressurizing means for applying a mechanical compressive force to the bending die 7, for example, a press cylinder 8. The bending die 7 includes an upper die 9 and a lower die 10 having opposing surfaces corresponding to the shape of a bent tree. The upper die 9 and the lower die 10 are vertically arranged inside the high-temperature and high-pressure container 2. . The press cylinder 8 is attached and fixed to the upper outer side of the high-temperature and high-pressure container 2 by an appropriate means, and a bending metal is attached to a tip end of a piston rod 8a that penetrates the peripheral wall of the high-temperature and high-pressure container 2 in an airtight manner and enters the inside. The upper die 9 of the die 7 is integrally attached and fixed. In addition, reference numeral 11 denotes a pipe for evacuating the inside of the high-temperature and high-pressure container 2 to reduce the pressure.

Next, a method of processing a bent tree according to the present invention will be described.

First, the lid 4 at the opening of the high-temperature and high-pressure container 2 is opened to open the high-temperature and high-pressure container 2, and the wood 1 to be bent is loaded into the high-temperature and high-pressure container 2 and the bending and forming apparatus 3 is formed. Is positioned and placed on the lower die 10 of the bending die 7. Next, the lid 4 at the opening of the high-temperature and high-pressure container 2 is closed to seal the high-temperature and high-pressure container 2, and a high-temperature (100 to 200 ° C.) and high-pressure (1.2 to 25 kg) /
cm ² ) of steam is supplied, and the wood 1 is treated with the high-temperature and high-pressure steam. Then, when the wood 1 is subjected to steam treatment for a predetermined time (about 1 to 10 minutes) in this state, the wood 1 absorbs high-temperature and high-pressure steam by the steam pressure, and the internal temperature rises, whereby the wood 1 is heated and softened.

When the wood 1 is heated and softened in this way, the upper die 9 of the bending die 7 is lowered by the press cylinder 8, and the wood 1 positioned and mounted on the lower die 10 of the bending die 7.
Is bent into a predetermined bending shape by an upper die 9 and a lower die 10 of a bending die 7, as shown in FIG. And after this,
By further processing the wood 1 with the high-temperature and high-pressure steam for a predetermined time (about 1 to 10 minutes) inside the high-temperature and high-pressure container 2 in the bent and formed state, the wood 1 undergoes a chemical change by the high-temperature and high-pressure steam. The bending deformation due to the bending is fixed.

When the bending deformation of the wood 1 is fixed in this manner, the interior of the high-temperature and high-pressure container 2 is evacuated through the pipe 11 to release the pressure, and then the lid 4 at the opening of the high-temperature and high-pressure container 2 is opened. To open the high-temperature and high-pressure container 2, raise the upper die 9 of the bending die 7 by the press cylinder 8, and remove the bent wood 1 from the lower die 10 of the bending die 7 to the outside of the high-temperature and high-pressure container 2. To finish processing.

As described above, the wood 1 is heated and softened by the high-temperature and high-pressure steam inside the high-temperature and high-pressure vessel 2, and is bent and formed by the bending apparatus 3. The bent wood fixed by the steam is fixed in bending deformation by bending unlike the processing by high frequency, and the bending deformation does not return by subsequent water absorption or moisture absorption. Further, since the wood 1 can be heated and softened quickly by the steam pressure, the processing time can be greatly reduced as compared with the processing by high frequency.

FIGS. 3 and 4 show deep drawing of wood, for example U
This embodiment shows an embodiment in the case of bending in the shape of a letter. In the figure, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description will be omitted.

In FIGS. 3 and 4, reference numeral 12 denotes a tonette on which the wood 1 is set. Locking pieces 12b and 12b are provided at both ends of a metal band 12a having the same length as the length of the wood 1.
12b is attached, and has the function of guarding the lower surface of the wood 1 from cracking due to tensile stress during bending. 13 is U
An upper die having a U-shaped molding surface 13a, which is fixed to the tip of a piston rod 14a of a press cylinder 14 which is mounted by appropriate means on the upper part of the high-temperature and high-pressure vessel 2. Reference numerals 15 and 16 denote first and second lower dies which are opposed to each other and have semi-U-shaped molding surfaces 15a and 16a. The press cylinders 17 and 18 are fixed to the distal ends of piston rods 17a and 18a.

Next, the operation of the above embodiment will be described.

First, as shown in FIG. 3, wood 1 to be bent is set in a tonet 12 and carried into a high-temperature and high-pressure container 2 where it is first and second lower dies 1.
Position and place on 5 and 16. Next, a high temperature (100 to 200 ° C.) and high pressure (1.2 to 25 kg)
/ Cm ² ), and the wood 1 is treated with the high-temperature and high-pressure steam. When the wood 1 is subjected to steam treatment for a predetermined time (about 1 to 10 minutes) in this state, the wood 1 absorbs high-temperature and high-pressure steam due to the steam pressure, and the internal temperature rises, whereby the wood 1 is softened by heating.

When the wood 1 is softened by heating as described above, the upper die 13 is lowered by the press cylinder 14 and the first and second lower dies 15 are pressed by the press cylinders 17 and 18 as shown in FIG. , 16 are advanced, and as shown in FIG. 4, the wood 1 positioned and mounted on the first and second lower dies 15, 16 is bent and formed into a U-shape together with the tonet 12. Then, after this, the wood 1 is bent into a U-shape in the high-temperature high-pressure container 2 for a predetermined time (about 1 to 10 minutes).
By further processing with high-temperature and high-pressure steam, the wood 1 undergoes a chemical change due to high-temperature and high-pressure steam, and bending deformation due to bending is fixed.

When the bending deformation of the wood 1 is fixed in this way, the interior of the high-temperature and high-pressure container 2 is evacuated and depressurized. After the second lower dies 15 and 16 are retracted by the press cylinders 17 and 18, the wood 1 processed into a U-shaped bent wood is taken out of the high-temperature and high-pressure container 2 to complete the processing.

[0025]

[0026]

As described above, according to the present invention,
Bending tree shape can be maintained permanently without returning to bending deformation due to subsequent water absorption or moisture absorption, and processing can be performed in a very short time and in a single process to improve workability and run. Costs can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an example of an apparatus for implementing the present invention.

FIG. 2 is a schematic configuration diagram showing a state at the time of bending forming in FIG. 1;

FIG. 3 is a schematic configuration diagram showing another embodiment of an apparatus for implementing the present invention.

FIG. 4 is a schematic configuration diagram showing a state at the time of bending forming in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wood 2 High-temperature / high-pressure container 3 Bending tree forming press 4 Lid 5 Pipe 6 Pipe 7 Press die 8 Press cylinder 9 Upper die 10 Lower die 11 Piping 12 Tonet 13 Upper die 14 Press cylinder 15 First lower die 16 Second Lower die 17 Press cylinder 18 Press cylinder

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B27H 1/00 B27D 1/08

Claims (1)

(57) [Claims] In processing a bent tree, a bending apparatus is provided inside a high-temperature and high-pressure container to apply a mechanical compressive force to bend the wood into a desired bent tree shape. After heat-softening by steaming with high-temperature and high-pressure steam inside the container, the wood is bent into the desired bent wood shape using the bending device, and the bending deformation is performed at a high temperature in the bent state. A method for processing bent wood, characterized in that steaming is further performed with high-temperature and high-pressure steam inside a high-pressure vessel to be fixed.