JP2016168348A - Method for manufacturing wooden built-up block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wooden built-up block capable of being properly connected in a freely attachable and detachable manner.SOLUTION: A block 1 assumes a rectangular parallelepiped shape comprising a top surface, an undersurface, a pair of long side surfaces and a pair of short side surfaces. A method for manufacturing the block 1 includes steps (S5, S7 and S9) of uniformalizing a water content of dried wood 51a by increasing the water content, and a step (S10) of forming the block 1 by shaving the wood 51a with the uniformalized water content. In the method for manufacturing the block 1, shaving is performed so that one of the long and short side surfaces can be an edge grain surface and so that the other one can be a flat grain surface.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a method for manufacturing a wooden assembly block.

Patent Document 1 describes an assembly block (construction element) for toys.
About this kind of assembly block, the function as a toy can be implement | achieved by connecting a some assembly block mutually and assembling so that it may become a desired shape.
The assembly block is, for example, a box-shaped block main body with an opening on the lower surface, a plurality of protrusions projecting upward from the upper surface of the block main body, and located in the block main body so that other wooden blocks are connected when the assembly blocks are connected to each other. An engaging portion that accommodates and engages the convex portion.
As an assembly block, those made of resin or wood and those formed by solidifying sawdust with resin are known. Non-Patent Document 1 discloses a wooden assembly block.

Japanese Patent No. 4422344

New Tech Shinsei Co., Ltd. Moku Rock Division, “Moku Rock Paper Vol.2”, p. 1-8, [online], January 2013, Newtech Shinsei Co., Ltd., Moklock Division, [Search June 21, 2013], Internet <URL: http://mokulock.com/catalog2.pdf>

By the way, if the assembly block as described above is formed by cutting from a single piece of wood instead of being formed of resin or the like, the user can feel the feel and scent of wood when using the assembly block.
However, for assembly blocks formed by cutting from wood, if there is a variation in the moisture content of the wood before machining, there will be a variation in the degree of expansion between the assembly blocks when using the assembly block (during assembly). It can happen. Therefore, it may be difficult to connect the assembly blocks, and even if they can be connected, the assembly blocks may be firmly engaged with each other, and it may be difficult to separate the assembly blocks.

  In view of such a situation, an object of the present invention is to manufacture a wooden assembly block that can be connected detachably.

  Therefore, in the present invention, as a method for producing a wooden assembly block having a rectangular parallelepiped shape composed of an upper surface, a lower surface, a pair of long side surfaces, and a pair of short side surfaces, a step of increasing the moisture content of dried wood and making it uniform Cutting a wood having a uniform moisture content to form a wooden assembly block. In this method of manufacturing a wooden assembly block, the cutting process is performed so that one of the long side surface and the short side surface is a grid surface and the other is a plate surface.

  Here, the “water content of wood” in the present invention means the weight ratio of water contained in wood. In addition, the “homogenization of the moisture content of the wood” in the present invention includes making the moisture content of each position in the wood uniform (that is, reducing the variation in the moisture content depending on the position of the wood). Further, in the present invention, “homogenization of moisture content of wood” means that wood with reduced variation in moisture content is allowed to stand for a predetermined period (for example, several months) and adjust to the moisture content (in other words, Stabilization).

  According to the present invention, the moisture content of the dried wood is increased and homogenized. That is, for wood, the moisture content increases and becomes uniform after the moisture content decreases by drying. Thereby, after the wood is in a state where it can absorb moisture as a whole, the moisture content of the wood can be increased and made uniform, so that variation in the moisture content of the wood can be suppressed. Therefore, variation in the degree of expansion / contraction between the wooden assembly blocks can be suppressed, and as a result, the wooden assembly blocks can be connected detachably and satisfactorily.

It is a perspective view of the wooden assembly block in one Embodiment of this invention. It is a top view of a wooden assembly block. It is II sectional drawing of FIG. It is a bottom view of a wooden assembly block. It is a figure which shows the connection state of a wooden assembly block. It is a figure which shows the connection state of a wooden assembly block. It is a figure which shows the log of hardwood. It is a figure which shows the square lumber manufactured from the log material. It is a figure which shows the relationship between the moisture content of a square material (wood), a shrinkage | contraction direction, and a shrinkage rate. It is a flowchart which shows the manufacturing method of a wooden assembly block. It is a flowchart which shows the manufacturing method of a wooden assembly block. It is a figure which shows schematic structure of an example of a cutting device.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a wooden assembly block according to an embodiment of the present invention. FIG. 2 is a top view of the wooden assembly block. 3 is a cross-sectional view taken along the line II of FIG. FIG. 4 is a bottom view of the wooden assembly block. FIG. 5 shows a state in which two wooden assembly blocks are connected such that their longitudinal directions are orthogonal to each other in plan view. FIG. 6 shows a state in which two wooden assembly blocks are connected so that their longitudinal directions are parallel in plan view. In the following, for the sake of convenience, the wooden assembly block will be described by defining the top, bottom, front, back, left and right as shown in FIG.

  The wooden assembly block 1 shown in FIGS. 1 to 4 (hereinafter simply referred to as “block 1”) is formed by cutting out from wood. The wood for block 1 is preferably a hardwood material such as cherry, hoo, itaya maple, hornbeam, hippopotamus, etc., and its air-dry specific gravity can be in the range of about 0.4 or more and about 0.8 or less. Here, the configuration of the blocks 1a and 1b shown in FIGS. 5 and 6 is the same as the configuration of the block 1 shown in FIGS.

As shown in FIGS. 1 to 4, the block 1 includes a rectangular parallelepiped block body 2. The dimensions of the block body 2 are, for example, horizontal × vertical × height = 32 mm × 16 mm × 10 mm.
The block body 2 includes a rectangular upper wall 21, a pair of left and right rectangular side walls 22, a pair of front and rear rectangular side walls 23, and a rectangular opening (lower surface opening) 24. The outer peripheral edge of the upper wall portion 21 is continuous with the upper end edge of the pair of left and right side wall portions 22 and the upper end edge of the pair of front and rear side wall portions 23. The opening 24 is surrounded by the lower edges of the pair of left and right side walls 22 and the lower edges of the pair of front and rear side walls 23. That is, the block main body 2 has a box shape with a lower surface opening. Here, the outer surface of the side wall portion 22 corresponds to the “short side surface” of the present invention, and the outer surface of the side wall portion 23 corresponds to the “long side surface” of the present invention. Further, the thickness of the side wall portion 22 is equal to the thickness of the side wall portion 23.

  A plurality of convex portions 25 are formed on the outer surface of the upper wall portion 21 of the block body 2 (that is, the upper surface of the block body 2). In the arrangement of the convex portions 25 shown in FIGS. 1 to 4, the eight convex portions 25 are arranged in a matrix (in the drawing, 2 front and back × 4 left and right in the figure), and above the upper surface of the block body 2. Protruding. Here, the distance between the adjacent convex portions 25 is about twice the thickness of each of the side wall portions 22 and 23. The number of convex portions 25 formed on the upper surface of the block body 2 is not limited to eight.

The internal space 26 of the block main body 2 is partitioned by the upper wall portion 21 and the side wall portions 22 and 23 and communicates with the outside through the opening 24. The internal space 26 is divided into two equal parts by a rectangular plate-shaped rib portion 27 into a left internal space 26a and a right internal space 26b. In other words, the left inner space 26 a and the right inner space 26 b are partitioned by the rib portion 27.
The rib part 27 is connected to the side wall part 23 at its front and rear ends. Further, the upper end of the rib portion 27 is continuous with the upper wall portion 23. The lower end surface of the rib portion 27 is located slightly above the lower end surfaces of the side wall portions 22 and 23.

The thickness of the rib portion 27 is about twice the thickness of each of the side wall portions 22 and 23. That is, the thickness of the rib portion 27 is greater than the thickness of each of the side wall portions 22 and 23.
Here, the rib part 27 is located in the center part of the opening part 24 by the bottom view, and has divided the opening part 24 into two opening parts 24a and 24b.

  Cylindrical portions (cylindrical protrusions) 28 extending in the vertical direction are located in the internal spaces 26a and 26b, respectively. The cylindrical portion 28 has an upper end continuous with the upper wall portion 21 and a lower end surface positioned slightly above the lower end surfaces of the side wall portions 22 and 23. That is, the cylindrical portion 28 is located in the internal spaces 26 a and 26 b and protrudes downward from the inner surface of the upper wall portion 21. The cylindrical portion 28 is located at the center of each of the internal spaces 26a and 26b in plan view. Therefore, the cylindrical part 28 is located in the opening parts 24a and 24b in the bottom view.

  In addition, in the internal spaces 26a and 26b, instead of the cylindrical portion 28, column portions (columnar protrusions) (not shown) may be positioned. However, it is preferable to employ the cylindrical portion 28 because the cylindrical portion 28 can soften the feel when the blocks 1a and 1b are connected compared to the column portion.

  When the blocks 1a and 1b as shown in FIGS. 5 and 6 are connected, the projecting portion 25 of the block 1b is accommodated in the internal space 26 of the block 1a, and the engaging portion includes the side wall portions 22 and 23 and the cylindrical portion 28. Or engages with an engaging portion including the side wall portion 23, the rib portion 27, and the cylindrical portion 28. That is, the function of the “engagement portion that accommodates and engages the convex portion of another wooden assembly block” of the present invention is realized by the side wall portions 22 and 23, the rib portion 27, and the cylindrical portion 28 of the block body 2. The

The outer surface (upper surface) of the upper wall portion 21 of the block body 2 is a mouth end surface.
About the outer surface (short side surface and long side surface) of the side wall parts 22 and 23 of the block main body 2, one side is a grid surface, and the other is a plate surface. That is, if the short side surface of the block body 2 is a grid surface, the long side surface of the block body 2 is a plate surface. On the other hand, if the short side surface of the block body 2 is a plate surface, the long side surface of the block body 2 is a grid surface.

Here, the relationship between the moisture content of the wood which comprises the block 1, and an expansion-contraction rate is demonstrated using FIGS.
FIG. 7 is a diagram showing a hardwood log 50 used for manufacturing the block 1. FIG. 8 is a view showing a square member 51 made from the log member 50. FIG. 9 is a diagram illustrating the relationship among the moisture content, shrinkage direction, and shrinkage rate of the square member 51 (wood).

  FIG. 7 shows the length direction (fiber direction) L, the radial direction R of the annual ring, and the tangential direction T of the annual ring for the log 50. Further, FIG. 8 shows the relationship between the wood end surface 52, the grid surface 53, and the plate surface 54 of the square member 51 and the above-described length direction L, radial direction R, and tangential direction T. Here, with respect to the square member 51, the length direction L is referred to as “the end direction L”. Further, the radial direction R is referred to as a “grid direction R”. Further, the tangential direction T is referred to as “plate direction T”.

As shown in FIG. 9, with respect to the square member 51, the shrinkage rate of the square member 51 increases as the moisture content of the square member 51 decreases in each of the mouth direction L, the grid direction R, and the plate direction T. Here, the shrinkage rate of the square member 51 is the shrinkage in each direction L, R, T based on the length of each direction L, R, T of the square member 51 when the moisture content of the square member 51 is 60%. Shows the percentage.
When the moisture content of the square member 51 is greater than 0% and within the range of 30% or less, when the moisture content of the square member 51 decreases by 1%, the square member 51 contracts by about 0.01% in the butt end direction L, and the square It shrinks by about 0.15% in the direction R, and shrinks by about 0.25% in the plate direction T. Therefore, when the moisture content of the square member 51 is greater than 0% and within the range of 30% or less, the stretch rate in the plate direction T is equal to the stretch rate in the square direction R when the moisture content of the square member 51 changes. The expansion / contraction ratio in the grid direction R is about 15 times the expansion ratio in the neck direction L, and the expansion / contraction ratio in the plate direction T is about 25 times the expansion ratio in the neck direction L.

  Therefore, about the block 1 in which various connection modes as shown in FIG. 5 and FIG. 6 are assumed, one of the short side surface and the long side surface of the block body 2 is a grid surface and the other is a plate surface. Therefore, the expansion / contraction ratio in the left / right direction can be suppressed within a range of about 0.6 to 1.6 times the expansion / contraction ratio in the front / rear direction. Can be linked. Moreover, the burr | flash generation | occurrence | production in the convex part 25 can be suppressed by making the upper surface of the block main body 2 into a mouth end surface.

By the way, when a plurality of square bars 51 are purchased from a lumber company and a large number of blocks 1 are manufactured using these square bars 51, if the moisture content of these square bars 51 varies greatly, Variation in the degree of expansion and contraction may occur between the blocks 1 during assembly). Also, in each square member 51, if the moisture content distribution is not uniform, the degree of expansion and contraction may vary between the blocks 1 when the blocks 1 are used.
For this reason, in the present embodiment, the manufacturing method of the block 1 shown in FIGS. 10 and 11 is adopted to suppress the occurrence of variation in the degree of expansion / contraction between the blocks 1 when the block 1 is used. Detachability is further improved.

10 and 11 are flowcharts showing the manufacturing method of the block 1. In addition, step S1-step S14 mentioned later are performed on the atmospheric conditions whose temperature is normal temperature (within the range of 20 degreeC or more and 25 degrees C or less).
First, in step S1, a long wood (square member 51) is cut with a predetermined dimension (for example, a length of 400 mm) to form a plurality of wood pieces (wood 51a). Thereafter, the process proceeds to step S2.

  Step S2 is a primary drying process. In the primary drying step, the plurality of pieces of wood 51a are dried under atmospheric conditions adjusted to a relative humidity within a range of 45% RH or more and 55% RH or less. In the primary drying step, familiar dehumidification of the wood 51a is performed over a period of about one week to one month. In addition, about wood 51a, since length was shortened by step S1, it can acclimatize well to the inside and can perform dehumidification. Thereafter, the process proceeds to step S3.

  Step S3 is a secondary drying process. In the secondary drying step, the plurality of pieces of wood 51a are dried under atmospheric conditions adjusted to a relative humidity within a range of 20% RH or more and 35% RH or less. In the secondary drying step, the wood 51a is dehumidified over a period of about 1 to 6 months. In the secondary drying step, if the wood 51a is dried under an atmospheric condition adjusted to a relative humidity lower than 20% RH, the drying speed is too fast and cracks may occur in the wood 51a. In the secondary drying step, if the wood 51a is dried under an atmospheric condition adjusted to a relative humidity higher than 35% RH, the drying speed is slow, and thus it may take time to dry the wood 51a. Therefore, in the present embodiment, in the secondary drying step, the wood 51a is cracked by drying the wood 51a under atmospheric conditions adjusted to a relative humidity within the range of 20% RH or more and 35% RH or less. The wood 51a can be efficiently dried while suppressing the occurrence of cracks.

Here, the reason why the wood 51a drying process is divided into the primary drying process (step S2) and the secondary drying process (step S3) will be described.
The wood 51a before entering Step S2 may have a moisture content of about 12% to 40%. When the wood 51a having such a wide variation in moisture content is immediately dried under an atmospheric condition adjusted to a relative humidity within the range of 20% RH or more and 35% RH or less as in step S3. Cracks may occur in the wood 51a. As a countermeasure, in this embodiment, the moisture content of the wood 51a is reduced by reducing the moisture content of the wood 51a to 20% or less by familiarizing and dehumidifying the wood 51a having a high moisture content in step S2. Reduce. In step S3, the wood 51a is dried under an atmospheric condition adjusted to a relative humidity within the range of 20% RH or more and 35% RH or less, and the moisture content of the wood 51a is reduced to less than 9.5%. Decrease. Thereby, even in the case of the wood 51a having a wide variation in moisture content, the atmospheric conditions are adjusted to a relative humidity within the range of 20% RH or more and 35% RH or less while suppressing the occurrence of cracking. Thus, the wood 51a can be dried to reduce the moisture content of the wood 51a to less than 9.5%. Here, the relative humidity constituting the atmospheric condition in step S3 corresponds to the “second relative humidity” of the present invention.

In step S4, it is determined for each wood 51a whether or not the moisture content of the wood 51a that has undergone the secondary drying step (step S3) is less than 9.5%. Here, for example, the moisture content at the center of the wood 51a is measured with a high frequency moisture meter, and the determination can be made based on the measured value. Here, about the timber 51a, there exists a tendency for a moisture content to become large, so that it goes to the center part from the edge part. Therefore, if the measured value of the moisture content at the center of the wood 51a is less than 9.5%, it can be estimated that the moisture content at the end of the wood 51a is also less than 9.5%.
For the wood 51a determined in step S4 that the moisture content is not less than 9.5% (that is, 9.5% or more), the process returns to step S3. On the other hand, for the wood 51a determined to have a moisture content of less than 9.5%, the process proceeds to step S5.

  Step S5 is a primary humidity control process. In the primary humidity conditioning step, the wood 51a is preferably conditioned at a relative humidity within the range of 40% RH to 60% RH, more preferably 45% RH to 55% RH. For about one month or more (for example, several months) under atmospheric conditions adjusted to a relative humidity within the range of (i.e., atmospheric conditions adjusted to a relative humidity of around 50% RH). In the primary humidity conditioning step, the moisture content of the wood 51a is increased to a range of 9.5% to 10.5% and uniformized. In this primary humidity control step, not only the moisture content of the central portion of the wood 51a but also the moisture content of the end portion is increased to a range of 9.5% or more and 10.5% or less. The rate can be made uniform. In order to make the moisture content of the wood 51a uniform, the wood 51a is left to stand for a predetermined period (for example, about two weeks) under the above-described atmospheric conditions in the primary humidity control step, so that the moisture content of the wood 51a is 9.5% or more and 10 .. Uniform within 5% or less (first step), and subsequently, the wood 51a is subjected to a predetermined period (for example, about one week to several months) under the above atmospheric conditions in the primary humidity control step. And let it adjust to a moisture content in the range of 9.5% or more and 10.5% or less (second step (stabilization step)). By adapting the wood 51a in this manner, even if there is a change in the dry state around the wood 51a, it is possible to suppress the moisture content of the wood 51a from changing following the change. When the primary humidity control process is completed, the process proceeds to step S6.

  Step S6 is a primary processing step. In the primary processing step, the surface layer of the wood 51a is processed. After this processing, the process proceeds to step S7. Note that the moisture content of the wood 51a is slightly reduced by the processing in step S6.

  Step S7 is a secondary humidity control process. In the secondary humidity conditioning step, the wood 51a is preferably conditioned at a relative humidity within the range of 40% RH to 60% RH, more preferably 45% RH to 55% RH. For one day or longer under atmospheric conditions adjusted to a relative humidity within the range of (i.e., atmospheric conditions adjusted to a relative humidity of around 50% RH). In the secondary humidity control step, the moisture content of the wood 51a is increased to a range of 9.5% to 10.5% and uniformized. Thereafter, the process proceeds to step S8.

  Step S8 is a secondary processing step. In the secondary processing step, the wood 51a is processed to a size suitable for the main product processing in step S10 described later. After this processing, the process proceeds to step S9. The water content of the wood 51a is slightly reduced by the processing in step S8.

  Step S9 is a tertiary humidity control process. In the third humidity control step, the wood 51a is preferably conditioned at a relative humidity within the range of 40% RH to 60% RH, more preferably 45% RH to 55% RH. For one day or longer under atmospheric conditions adjusted to a relative humidity within the range of (i.e., atmospheric conditions adjusted to a relative humidity of around 50% RH). In the third humidity control step, the moisture content of the wood 51a is increased to a range of 9.5% to 10.5% and uniformized. Thereafter, the process proceeds to step S10.

  Step S10 is a product main processing step. In the product main processing step, the wood 51a is preferably adjusted to a relative humidity within a range of 40% RH or more and 60% RH or less, more preferably 45% RH or more and 55% RH or less. It is processed into a product (i.e., block 1) under atmospheric conditions conditioned to a relative humidity within the range (i.e., under atmospheric conditions conditioned to a relative humidity around 50% RH). In this step, the block 51 is formed by cutting the wood 51a.

FIG. 12 shows a schematic configuration of an example of a cutting apparatus that can be used in step S10.
The cutting device 70 includes a base 72 installed on the floor surface 71, a table 73, a head unit 74, a cutting tool 75, and a control panel 76.

The table 73 is provided on the base 72 so as to be movable in the X direction (vertical direction) and the Y direction (horizontal direction). On the table 73, the wood 51a is fixed via a jig (not shown).
The head unit 74 is disposed above the table 73 and is configured to reciprocate in the Z-axis direction (height direction).

The cutting tool 75 is attached to the lower end of the head portion 74 so as to be rotatable around the Z axis. The cutting tool 75 is an end mill, for example.
The control panel 76 includes an input unit and an output unit (not shown) and performs various controls including operation control of the cutting device 70.

  In the cutting process by the cutting device 70, the operation of the cutting edge of the cutting tool 75 is defined by the coordinate value via the input unit of the control panel 76. The control panel 76 operates the table 73 and the cutting tool 75 by operating a servo motor or the like (not shown) based on the defined information. Thereby, the wood 51 a on the table 73 is cut by the cutting tool 75. About this cutting condition, it can grasp | ascertain by monitoring the output part (for example, monitor) of the control panel 76. FIG. In this manner, numerical control of the cutting process can be realized by the cutting device 70.

  In this embodiment, the table 73 is movable in the X direction and the Y direction. However, the table 73 is fixed to the base 72, and the head unit 74 is movable in the X direction and the Y direction. May be.

  In the product main processing step of step S10, first, the wood 51a is set in the cutting device 70 via a jig. Next, the cutting device 70 performs cutting to form the upper surface of the blocks 1 and the convex portions 25 on the wood 51a (cutting process α). That is, in the cutting process α, the convex portion 25 of the block 1 is cut out. Next, the wood 51a is turned over and set again in the cutting device 70 via a jig. Next, the cutting device 70 performs cutting to form the opening 24, the internal spaces 26a and 26b, the rib portion 27, and the cylindrical portion 28 of the block 1 on the wood 51a (cutting step β). That is, in the cutting process β, the engaging portion of the block 1 is cut out. Next, the cutting device 70 performs a cutting process to separate one block 1 (cutting process γ). Thereafter, the cutting process β and the cutting process γ are repeated to manufacture a plurality of blocks 1. Note that the moisture content of the block 1 is slightly reduced by the cutting in step S10.

In step S10, the cutting process β is performed after the cutting process α. The reason for this is as follows.
Temporarily, in step S10, after the cutting process β, the wood 51a is turned upside down and set again in the cutting device 70 via a jig, and the cutting process α is performed. Therefore, at the time of resetting through the jig, the wood 51a may be curved and deformed so as to protrude toward the upper surface side of the block 1. Further, when the cutting step α is performed in this curved deformation state, it is difficult to cut the upper surface of the block 1 horizontally. Therefore, it has been difficult to keep the dimensions of the block 1 within the allowable range.
In this regard, in the present embodiment, in step S10, after the cutting process α, the wood 51a is turned over and set again in the cutting device 70 via a jig, and the cutting process β is performed. Thereby, since the side part of the timber 51a has sufficient thickness at the time of resetting via a jig | tool, generation | occurrence | production of the above curved deformation | transformation of the timber 51a can be suppressed.

  In step S10, the fitting allowance (press fitting allowance) between the blocks 1 is set according to the type of the wood 51a, and the above-described cutting process is performed based on this installation value. For example, if the wood 51a is soft wood, the press-fitting allowance is increased, while if the wood 51a is hard wood, the press-fit allowance is reduced. Thereby, the blocks 1 can be connected detachably and satisfactorily.

When the product main processing in step S10 is completed, the process proceeds to step S11.
Step S11 is a quaternary humidity control step. In the fourth humidity conditioning step, the wood 51a is preferably conditioned at a relative humidity within the range of 40% RH to 60% RH, and more preferably 45% RH to 55% RH. For 12 hours or longer under atmospheric conditions adjusted to a relative humidity within the range (ie, atmospheric conditions adjusted to a relative humidity of around 50% RH). In the quaternary humidity control step, the moisture content of the block 1 is increased to a range of 9.5% or more and 10.5% or less and is made uniform. Thereafter, the process proceeds to step S12.

  In step S12, it is determined whether or not the dimension of the block 1 (product) that has undergone the fourth-order humidity control step (step S11) is within a predetermined allowable range. Here, it is preferably adjusted to a relative humidity within a range of 45% RH or more and 55% RH or less under an atmospheric condition adjusted to a relative humidity within a range of 40% RH or more and 60% RH or less. The product dimensions are measured under humidified atmospheric conditions (i.e. under atmospheric conditions adjusted to a relative humidity of around 50% RH) and a determination is made based on this measurement. Here, the “predetermined allowable range” means an allowable range of product dimensions for determining whether or not the block 1 is shipped as a product.

  If the dimensions of the product are within a predetermined allowable range in step S12, the product is determined to be non-defective (step S13), and the process proceeds to step S14 where the product is packed. In the packing process of step S14, the humidity is preferably adjusted to a relative humidity within the range of 40% RH to 60% RH, and more preferably within the range of 45% RH to 55% RH. The product is packaged under an atmospheric condition adjusted to a relative humidity within (ie, an atmospheric condition adjusted to a relative humidity around 50% RH).

  On the other hand, if the dimension of the product is outside the predetermined allowable range in step S12, it is determined as a defective product (step S15). Those determined to be defective are used as prototypes, small items, or samples, or are discarded.

  Here, the relative humidity constituting the atmospheric conditions in steps S5, S7, S9, S10 to S14 corresponds to the “first relative humidity” of the present invention. In addition, the “second relative humidity” described in step S3 described above is lower than the “first relative humidity”.

The “first relative humidity” is set based on the use environment of the block 1.
For example, assuming that the block 1 is used in Japan, the relative humidity can vary within a range of about 20% RH to 80% RH depending on the season in Japan. Relative humidity around 50% RH) may be set as the “first relative humidity”.

  According to this embodiment, as a manufacturing method of the block 1, the process (S5, S7, S9) of increasing the moisture content of the dried wood 51a to make it uniform, and the wood 51a with the uniform moisture content are shaved. And a step (S10) of forming the block 1 by performing a drawing process. That is, about the timber 51a, after the moisture content decreases by drying, the moisture content increases and becomes uniform. Thereby, after the wood 51a becomes a state which can absorb moisture as a whole, the moisture content of the wood 51a can be increased and made uniform, so that variation in the moisture content of the wood 51a can be suppressed. it can. Therefore, variation in the degree of expansion / contraction between the blocks 1 can be suppressed, and as a result, the blocks 1 can be connected detachably and satisfactorily.

  Further, according to the present embodiment, in the step (S5, S7, S9) of increasing the moisture content of the wood 51a and making it uniform, the wood 51a is left under the atmospheric condition adjusted to the “first relative humidity”. By doing so, the moisture content of the wood 51a is increased and made uniform. Thereby, it is possible to increase the water content of the wood 51a and make it uniform relatively easily.

  Further, according to the present embodiment, in the step (S10) of forming the block 1, the wood 51a is cut out and processed under the atmospheric condition adjusted to “first relative humidity” to form the block 1. Thereby, the fluctuation | variation of the moisture content of the wood 51a at the time of a cutting-out process can be suppressed.

  Further, according to the present embodiment, the “first relative humidity” is set based on the use environment of the block 1. Thereby, since the block 1 can be manufactured under the atmospheric conditions suitable for the use environment of the block 1, the variation in the expansion / contraction degree between the blocks 1 when the block 1 is used can be suppressed. They can be connected detachably and satisfactorily.

  Further, according to the present embodiment, the “first relative humidity” is in the range of 40% RH or more and 60% RH or less. Thereby, even if the use environment of the block 1 is high humidity or low humidity, the expansion and contraction of the block 1 when the block 1 is used can be suppressed to be relatively small.

  Moreover, according to this embodiment, as a manufacturing method of the block 1, prior to the step (S5) of increasing the water content of the wood 51a and making it uniform, the step of drying the wood 51a and reducing the water content of the wood 51a. (S3) is further included. In the step of reducing the moisture content of the wood 51a by drying the wood 51a (S3), the wood 51a is dried under an atmospheric condition adjusted to a “second relative humidity” lower than the “first relative humidity”. To reduce the moisture content of the wood 51a. Thereby, the wood 51a can be brought into a state capable of absorbing moisture before entering the primary moisture conditioning step (S5), so that the moisture content of the wood 51a is totally reduced in the primary moisture conditioning step (S5). It can be made uniform by increasing the thickness of the wood 51a, and thus the variation in the moisture content of the wood 51a can be suppressed.

  Further, according to the present embodiment, the “second relative humidity” is in the range of 20% RH or more and 35% RH or less. Thereby, the moisture content of the wood 51a can be reduced to less than 9.5% relatively easily.

  Further, according to the present embodiment, in the step (S3) of drying the wood 51a to reduce the moisture content of the wood 51a, the moisture content of the wood 51a is reduced to less than 9.5%. Thereby, the wood 51a can be brought into a state capable of absorbing moisture before entering the primary moisture conditioning step (S5), so that the moisture content of the wood 51a is totally reduced in the primary moisture conditioning step (S5). It can be made uniform by increasing the thickness of the wood 51a, and thus the variation in the moisture content of the wood 51a can be suppressed.

  Moreover, according to this embodiment, in the step (S5, S7, S9) of making the moisture content of the wood 51a uniform, the moisture content of the wood is made uniform within a range of 9.5% to 10.5%. . Thereby, even if the use environment of the block 1 is high humidity or low humidity, the expansion and contraction of the block 1 when the block 1 is used can be suppressed to be relatively small.

  According to the present embodiment, the wood 51a is a hardwood material. Thereby, compared with the block made from a softwood material, the intensity | strength is high and the block 1 which is hard to deform | transform can be manufactured.

  Further, according to the present embodiment, the block 1 includes a box-shaped block main body 2 with a lower surface opening, a plurality of convex portions 25 protruding upward from the upper surface of the block main body 2, and the block 1 Engaging portions (side walls 22 and 23, rib portions 27, and cylindrical portions 28 of the block main body 2) that receive and engage the convex portions 25 of the other blocks 1 when the one block is connected to the other blocks 1; It is comprised including. The block main body 2, the convex portion 25, and the engaging portion (the side wall portions 22, 23, the rib portion 27, and the cylindrical portion 28 of the block main body 2) are formed by machining (S10). Thereby, at the time of use of the block 1, the user can feel the touch and scent of wood.

  Further, according to the present embodiment, the block main body 2 has a rectangular parallelepiped shape including an upper surface, a lower surface, a pair of long side surfaces, and a pair of short side surfaces, and one of the long side surface and the short side surface is a grid surface, and the other Is the grain surface. Thereby, about the block 1, since the expansion / contraction rate of the left-right direction can be restrained in the range of about 0.6 times-about 1.6 times the expansion / contraction rate of the front-back direction, Can be connected detachably.

  Further, according to the present embodiment, the block body 2 includes a rectangular upper wall portion 21, a plurality of rectangular side wall portions 22, 23 having upper end edges continuous with the outer peripheral edge of the upper wall portion 21, and the side wall portion 22. , 23 and a lower surface opening (opening 24) surrounded by a lower edge of the rectangular parallelepiped box, and the engaging portions are located at the side walls 22, 23 and the center of the opening 24. A rib portion 27 that divides the opening 24 into two opening portions 24a and 24b, and a cylindrical protrusion (cylindrical portion 28) that is located in the opening portions 24a and 24b and protrudes downward from the inner surface of the upper wall portion 21. Or it is comprised by a cylindrical protrusion (cylindrical part). Thereby, the blocks 1 can be connected detachably and satisfactorily.

  Further, according to the present embodiment, in the step (S10) of cutting the wood, the engaging portions (the side wall portions 22, 23, the rib portion 27, and the cylindrical portion of the block main body 2) after the convex portion 25 has been cut out. 28) is cut out. Thereby, in the process of cutting out the wood 51a to form the block 1, it is possible to suppress the occurrence of the curved deformation of the wood 51a as described above.

  Further, according to the present embodiment, as a manufacturing method of the block 1, the moisture content of the wood 51a is increased by leaving the dried wood 51a in an atmosphere condition adjusted to “first relative humidity”. Block (1), and the wood 51a having a uniform moisture content is machined and processed under an atmospheric condition adjusted to the “first relative humidity”. Forming a step (S10). That is, about the timber 51a, after the moisture content decreases by drying, the moisture content increases and becomes uniform. Thereby, after the wood 51a becomes a state which can absorb moisture as a whole, the moisture content of the wood 51a can be increased and made uniform, so that variation in the moisture content of the wood 51a can be suppressed. it can. Therefore, variation in the degree of expansion / contraction between the blocks 1 can be suppressed, and as a result, the blocks 1 can be connected detachably and satisfactorily.

  Moreover, according to this embodiment, as a manufacturing method of the block 1, the step (S3) of reducing the moisture content of the wood 51a by drying the wood 51a under the atmospheric condition adjusted to “second relative humidity”; The dried wood 51a is allowed to stand under atmospheric conditions adjusted to a “first relative humidity” higher than the “second relative humidity”, thereby increasing the moisture content of the wood 51a and making it uniform. Steps (S5, S7, S9) and a step of forming the block 1 by cutting out the wood 51a having a uniform moisture content under atmospheric conditions adjusted to the “first relative humidity” ( S10). That is, about the timber 51a, after the moisture content decreases by drying, the moisture content increases and becomes uniform. Thereby, after the wood 51a becomes a state which can absorb moisture as a whole, the moisture content of the wood 51a can be increased and made uniform, so that variation in the moisture content of the wood 51a can be suppressed. it can. Therefore, variation in the degree of expansion / contraction between the blocks 1 can be suppressed, and as a result, the blocks 1 can be connected detachably and satisfactorily.

  The illustrated embodiment is merely an example of the present invention, and the present invention is not limited to the embodiment described directly, but includes various improvements and modifications made by those skilled in the art within the scope of the claims. Needless to say, it is included.

1, 1a, 1b Wooden assembly block 2 Block body 21 Upper wall part 22, 23 Side wall part 24 Opening part 24a, 24b Opening part 25 Convex part 26, 26a, 26b Internal space 27 Rib part 28 Cylindrical part 50 Log member 51 Square member 51a Wood 52 Wood face 53 Grain face 54 Plate face 70 Cutting device 71 Floor surface 72 Base 73 Table 74 Head part 75 Cutting tool 76 Control panel

Claims (1)

A method of manufacturing a wooden assembly block that is a rectangular parallelepiped shape comprising an upper surface, a lower surface, a pair of long side surfaces, and a pair of short side surfaces,
Increasing the moisture content of the dried wood and homogenizing it,
Machining the wood having a uniform moisture content to form the wooden assembly block; and
Including
The machining is performed so that one of the long side surface and the short side surface is a grid surface and the other is a plate surface.
Manufacturing method of wooden building blocks.

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