JP2006326922A - Mold for compression-molding wood and manufacturing method of compressed wood molded product using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance manufacturing efficiency by easily releasing a compressed wood molded product from a molding surface without impairing the appearance of wood in a mold for compression-molding wood, and a manufacturing method of the compressed wood molded product using it. <P>SOLUTION: The mold 1 for compression-molding wood is equipped with an upper mold 2 equipped with a protruded core molding surface 5a and a lower mold 3 equipped with a recessed cavity molding surface 9a, and an extrusion pin 11 is provided so as to be protruded toward a molding space S from the cavity molding surface 9a. Then, the compression molding of blank wood is performed in a state that the pin tip surface 11a of the extrusion pin 11 is arranged to the cavity molding surface 9a and the extrusion pin 11 is protruded while separating the upper mold 2 and the lower mold 3, respectively, to perform a demolding process. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a compressed wood molding die and a method for producing a compressed wood molded product using the same.

2. Description of the Related Art Conventionally, it has been proposed to produce compressed wood molded products having various three-dimensional shapes such as a plate material, a box, a storage container, and an exterior body by compression molding wood with a mold. Such a compressed wood molded article has been attracting attention as a material having a texture and appearance not found in synthetic resins and metals because it has a surface characteristic peculiar to wood, such as a wood grain pattern exposed on the surface.
For example, in Patent Document 1, a plate-like wood compressed in the radial direction of an annual ring is formed into a tray-shaped three-dimensional shape by using a molding die composed of an upper mold and a lower mold each having a molding convex mold and a molding concave mold. A wood processing method for processing molded articles is described.
In this molding die, the upper die can be slid along the guide struts provided in the lower die, the upper die is lowered by a press machine, and the plate-like wood placed on the lower die is compressed. It is.
Further, Patent Document 2 discloses a third-order material of a wood material in which a plate material curved by a press die having a concave shape and a press die having a convex shape is compression-molded into a box-shaped container case having an opening on one side. The original processing method is described.
JP-A-8-25301 (FIGS. 5-8) Japanese Patent Laid-Open No. 11-77619 (FIGS. 7 and 8)

However, the conventional mold for molding compressed wood and the method for producing a compressed wood molded article using the same have the following problems.
Wood is made of wood fibers extending in the growth direction, and a number of voids such as conduits are formed in the radial direction of the annual rings. Therefore, although it is easily compressed in the radial direction of the annual ring, it returns to its original shape to some extent when the compression load is released. This characteristic is fundamentally different from injection molding of thermoplastic resin whose shape shrinks due to mold shrinkage and compression molding of thermosetting resin with extremely small shrinkage and deformation. is there.
Therefore, in Patent Documents 1 and 2, the wood is softened by infiltrating hot water into the wood, or the wood is treated with a high-temperature steam, and after the compression, the mold clamping is held for a predetermined time. The mold is removed after the shape is fixed along the mold surface.
In this case, although it is surely fixed to the shape along the mold surface, wood is a heterogeneous material with large strength anisotropy and has no molding fluidity like synthetic resin. Even if it receives a compressive force, it is difficult to equalize the residual stress inside the wood. For this reason, it is inevitable that residual stress is generated in a direction that resists deformation along the mold surface, and even if the shape is fixed, the mold is pressed more closely in the direction in which the deformation is going to come back and is in close contact. There is a problem of degrading the releasability. Therefore, there is a problem that the demolding process becomes complicated or the surface property after demolding deteriorates and the production efficiency deteriorates.
In order to improve the releasability, it is possible to use a release agent. However, since the release agent penetrates into wood, it causes discoloration, changes in surface gloss, etc. There is a problem that it is easy to damage.

  The present invention has been made in view of the above problems, and a compressed wood that can be easily released from the mold surface without deteriorating the appearance of the wood, and can improve the production efficiency. An object of the present invention is to provide a molding die and a method for producing a compressed wood molded article using the same.

In order to solve the above-described problems, in the invention according to claim 1, a compressed wood molded article having a three-dimensional shape is formed by moving at least two mold surfaces in opposite directions and compressing the wood. A compressed wood molding mold, wherein the two mold surfaces have at least one pair of a concave shape and a convex shape substantially corresponding to each other at opposite positions, and at least one of the two mold surfaces, It is set as the structure by which the extrusion member which releases the said compressed wood was provided in the area | region in which the concave shape was formed.
According to the present invention, when the two mold surfaces are moved in opposite directions to compress the timber and then removed from the mold, it is provided in the region where the concave shape is formed in at least one of the two mold surfaces. The compressed wood can be extruded and removed from the mold by the extruded member. Therefore, it is possible to easily release the compressed wood that tends to closely adhere to the concave mold surface side of the two mold surfaces facing each other rather than the convex mold surface.

  Here, the three-dimensional shape is a shape having three-dimensional unevenness and curvature, and means a shape in which the cross-sectional shapes along one direction are not substantially the same. For example, a flat plate shape, a flat plate is bent two-dimensionally or Curved shapes and columnar shapes are excluded.

According to a second aspect of the present invention, in the compressed wood molding die according to the first aspect, the two mold surfaces are a female die surface having a concave shape and a male die having a convex shape. The structure is composed of a surface.
According to this invention, the compressed wood can be easily released from the female mold surface having a concave shape.

According to a third aspect of the present invention, at least two mold surfaces have at least a pair of a concave shape and a convex shape that substantially correspond to each other at opposite positions, and the concave shape is at least one of the two mold surfaces. A method for producing a compressed wood molded article using a compressed wood molding die provided with an extrusion member that can be protruded in the opposite direction in the region in which the material is formed, and is disposed between the two die surfaces The compressed wood is compressed into the three-dimensional shape by moving the two mold surfaces in the opposite direction, and the two mold surfaces are separated from each other in the opposite direction. On the other hand, a method including a demolding step of ejecting the extruding member by projecting it in the opposite direction and releasing the mold.
According to this invention, since it is a method for producing a compressed wood molded article using the compressed wood molding die of the invention according to claim 1, the same effects as the invention according to claim 1 are obtained. Prepare.

According to a fourth aspect of the present invention, in the method for manufacturing a compressed wood molded article according to the third aspect, the extruding member is slightly delayed after starting the separation of the two mold surfaces in the demolding step. The method of sticking out.
According to this invention, since the extruding member is ejected with a slight delay after starting the separation of the two mold surfaces in the demolding process, the compressed wood and the concave mold surface are more than the case of projecting at the same time. And the compressed wood can be prevented from being strongly pressed by the extruding member and generating a protruding mark or the like.

  According to the compressed wood molding die of the present invention and the compressed wood molded article manufacturing method using the same, the concave mold surface of the two mold surfaces facing each other is more concave than the convex mold surface. Since the compressed wood that tends to adhere strongly to the side can be easily released, it can be smoothly removed without impairing the appearance of the surface of the wood and the production efficiency of the compressed wood molded product can be improved. There is an effect.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In all the drawings, even if the embodiments are different, the same or corresponding members are denoted by the same reference numerals, and common description is omitted.

A compressed wood molding die according to an embodiment of the present invention will be described.
FIG. 1 is a vertical cross-sectional explanatory diagram for explaining the configuration of a compressed wood molding die according to an embodiment of the present invention. Fig.2 (a) is a perspective explanatory view for demonstrating an example of the compression wood molded product manufactured using the metal mold | die for compression wood shaping concerning embodiment of this invention. FIG.2 (b) is the perspective explanatory drawing seen from the back surface side (illustration B direction) of Fig.2 (a).

  The compressed wood molding die 1 of the present embodiment is two molds that slide a blank wood made of, for example, a plate material or the like so as to face each other and relatively move in one direction (for example, the vertical direction in the present embodiment). A high-strength structure having a three-dimensional shape that is relatively thin and has a substantially constant thickness, such as a box, a housing, a container having an opening on one side, by a certain upper mold part 2 and lower mold part 3 It is for molding a compressed wood molded article such as a structure such as a cover or a shell-like member. Below, as an example, it demonstrates as what compresses and molds the compressed wood molded product 100 as shown, for example in FIG. 2 (a), (b).

As shown in FIG. 2 (a), the compressed wood molded article 100 is provided with a side surface portion that is erected from the outer periphery of the bottom surface portion that projects in a gentle dome shape on the lower surface side in a D shape in plan view. A box that opens upward is constructed.
The width dimension of the D-shaped substantially straight line portion is W, and the distance from the straight line portion to the apex of the D-shaped curve is L.
An opening end face 100d aligned on the same plane is formed at the opening of the box.
The inner surface of the compressed wood molded product 100 includes an inner bottom surface 100a and inner side surfaces 100b and 100c having a curved shape that gently protrudes downward in a D shape in plan view according to the shape of the bottom surface and side surfaces, as a whole. A concave shape is formed.
Here, the inner side surface 100c indicates a side surface that forms a D-shaped substantially linear portion of the inner bottom surface 100a, and the inner side surface 100b indicates a side surface that similarly forms a D-shaped U-shaped portion. Reference numeral 101 schematically indicates a grain line exposed on the surface of the compressed wood molded article 100.
The outer surface of the compressed wood molded product 100 is formed with an outer bottom surface 100A and outer side surfaces 100B, 100C that form substantially the same shape on the back surfaces of the inner bottom surface 100a and the inner side surfaces 100b, 100c, respectively, and forms a convex shape as a whole. ing. And the thickness of a bottom face part and a side part is made into the substantially constant thickness t.

The height dimension from the opening end face 100d to the dome apex of the outer bottom face 100A is H. Therefore, the depth on the inner surface side of the compressed wood molded product 100 is (Ht) from the opening end surface 100d. Here, H> t.
Specific examples of dimensions include dimensions such as t = 1.6 mm and H = 8 mm. In this case, the height H is 5 times the thickness t, and the depth of the box shape is 4 times the thickness t.

  Such a box is suitable as an exterior body of an electronic device such as a mobile phone, a remote controller, or a camera.

The type of blank wood for forming the compressed wood molded article 100 is not particularly limited. For example, camellia, camellia leaf, paulownia, teak, mahogany, cedar, pine, cherry blossom, bamboo and the like can be suitably employed.
The compression rate of the compressed wood molded product 100 can be set as appropriate according to the air dry density of the blank wood so that a predetermined density determined from the required surface strength and the like can be obtained.

As shown in FIG. 1, the schematic configuration of the upper mold part 2 of the compressed wood molding mold 1 includes an upper mold body 5, a pressing plate part 4, and a holding plate 6. The cross-sectional direction in FIG. 1 corresponds to the cross section along the line AA in FIG.
The upper mold body 5 has the shape of a core mold surface 5a (male mold surface) which is a convex mold surface that transfers the shape of the inner bottom surface 100a and the inner side surfaces 100b and 100c, and the shape of the opening end surface 100d. An end mold surface 5b to be transferred is provided on the lower end side in the figure. The side surface is provided with a side slide portion 5c for sliding and moving in the vertical direction in the figure with respect to the holding plate 6. The upper end side of the upper mold body 5 in the figure is joined to the pressing plate portion 4.

  The pressing plate portion 4 is a flat support plate joined to the upper end of the upper mold body 5, and a plurality of slide rod guide holes 4 c that are slidably fitted to a plurality of slide rods 7 to be described later. Is provided.

The holding plate 6 is slidably fitted to a slide guide hole 6a slidably fitted to the side slide part 5c of the upper mold body 5 and a plurality of slide rods 7 to be described later. And a slide rod guide hole 6d.
On the upper end side of the slide guide hole 6a, an inclined surface 6b is provided so that when the blank member is compressed, the slide member can smoothly slide with deformation.
The lower surface of the holding plate 6 is provided with a plate lower surface 6 c for contacting the lower mold part 3 in close contact. On the plate lower surface 6c, when the holding plate 6 comes into contact with the lower mold part 3, a plurality of later-described plural positions can be positioned so that the holding plate 6 can be horizontally positioned with respect to the lower mold part 3 in a detachable state in the vertical direction. A plurality of positioning holes 6e that fit into the guide pins 8 are provided.

  The lower mold part 3 is provided with a lower mold body 9 in a nested manner on the upper surface side of the central part of the block-shaped lower mold holding plate 10 as a base, and on the lower surface side of the lower mold holding plate 10. Extrusion pins 11 (extrusion members) that penetrate the mold main body 9 and the lower mold holding plate 10 in the vertical direction are provided.

On the plate upper surface 10a on the upper surface side of the lower mold holding plate 10, a plurality of slide rods 7 extending in the vertical direction and fitted in the slide rod guide holes 4c and 6d are fitted in the positioning holes 6e. Then, a plurality of guide pins 8 for positioning the holding plate 6 in the horizontal direction are erected in the vertical direction. The number of slide rods 7 is preferably about 2-4.
On the lower surface side of the lower mold holding plate 10, there is provided an extrusion pin accommodating portion 10b which is a hole portion for accommodating the extrusion pin 11 and movably accommodating it in the vertical direction.

The lower mold body 9 includes a mold body upper surface 9b aligned with the plate upper surface 10a in a state of being incorporated in the lower mold holding plate 10, and the outer side of the compressed wood molded product 100 is provided at the center of the mold body upper surface 9b. A cavity mold surface 9a (female mold surface), which is a concave mold surface that transfers the shape of the bottom surface 100A and the outer side surfaces 100B and 100C, is provided.
The cavity mold surface 9a is provided with a through hole 12 at a predetermined position in a region corresponding to the outer bottom surface 100A, for example, a position corresponding to the push pin pressing position 102 shown in FIG. The through hole 12 also penetrates the lower mold holding plate 10 and extends to the push pin accommodating portion 10b.

The extrusion pin 11 protrudes from the cavity mold surface 9a when the compressed wood molded product 100 is released from the mold after the compression molding, and is an axial member having an appropriate cross section that is released by extruding the compressed wood molded product 100. It is.
The push pin 11 is fitted to the through hole 12 so as to be able to advance and retreat. Therefore, at the time of compression molding, the pin tip surface 11a is disposed so as to close the through hole 12 on the cavity mold surface 9a, and a part of the shape to be transferred to the outer bottom surface 100A is formed together with the cavity mold surface 9a. is doing. On the other hand, at the time of demolding, it can be projected into the space on the cavity mold surface 9a via the extrusion head 11b provided on the other end side of the pin tip surface 11a.
The push-out pin 11 is pushed out by an appropriate pushing means that can apply power for pushing automatically or manually.
For example, when it is automatically performed, power can be supplied by a mechanical force such as a jack or a press machine in conjunction with the operation of the upper mold part 2. Moreover, when performing manually, the pushing force by a manual jack or a hammer is made to act on the extrusion head 11b, for example.

  In this way, in the compressed wood molding die 1, as shown in FIG. 1, a compressed wood molded product surrounded by the core die surface 5a, the end die surface 5b, the cavity die surface 9a, and the pin tip surface 11a. A molding space S corresponding to the outer shape of 100 is formed. That is, the pressing plate portion 4 is pressed by a press machine or the like, and the upper mold body 5 is lowered along the slide rod 7 so that the end mold surface 5b is aligned with the plate lower surface 6c of the holding plate 6, The plate lower surface 6c, the plate upper surface 10a, and the mold body upper surface 9b are disposed so as to be in close contact with each other, and the pin tip surface 11a of the push pin 11 is aligned with the cavity mold surface 9a, thereby forming the molding space S. Is formed.

Next, a method for manufacturing a compressed wood molded product of the present embodiment using the compressed wood molding die 1 will be described.
FIGS. 3A and 3B are process explanatory views for explaining each process in the method for manufacturing a compressed wood molded article according to the embodiment of the present invention. FIGS. 4C and 4D are process explanatory views for explaining each process subsequent to FIG. 3. Here, FIGS. 3 and 4 each show a cross section taken along the line AA of FIG. FIG. 5 is a graph schematically showing the movement of the convex mold surface and the extrusion member in the method for manufacturing a compressed wood molded article according to the embodiment of the present invention. The horizontal axis indicates time, and the vertical axis indicates the height in the vertical direction from an appropriate reference position.

The outline process of the manufacturing method of the compressed wood molded product of this embodiment consists of a compression process and a demolding process.
A compression process is a process of compressing the blank member 13 and fixing the compressed shape along the mold surface.
The blank member 13 may be a wood that is thicker than the thickness t in advance and may be a three-dimensional blank having a three-dimensional shape that substantially conforms to the shape of the compressed wood molded article 100. In this embodiment, the blank member 13 is compressed. A flat blank made of a flat plate having a thickness t ₀ (however, t ₀ > t) in which the outer shape is cut out to approximately the same size as the shape of the wood molded product 100 developed on a plane is used.

  First, as shown in FIG. 3 (a), the holding plate 6 is disposed in a close contact position on the lower mold holding plate 10 and the lower mold body 9, and the upper mold body 5 is pulled upward, A blank member 13 is set between the holding plate 6 and the upper mold body 5.

And as shown in FIG.3 (b), by applying the pressing force P to the press plate part 4, the press plate part 4 and the upper metal mold body 5 are gradually lowered along the slide rod 7, and the blank member 13 is compressed.
The blank member 13 first comes into contact with the core mold surface 5a and is deformed into a concave shape in accordance with its shape, and the lower end moves while sliding along the inclined surface 6b.
Then, compression proceeds while the blank member 13 is bent and is sandwiched between the core mold surface 5a and the cavity mold surface 9a. When the side slide portion 5c and the slide guide hole 6a are fitted, the blank member 13 is confined in the molding space S and is compressed as the molding space S is narrowed by the lowering of the upper mold body 5.
FIG. 4C shows the final stage of the compressed state in which the upper mold body 5 is lowered to a position where the molding space S has the same shape as the compressed wood molded product 100.

In the process of such compression, in order to soften the blank member 13, for example, compression is performed while injecting high-temperature high-pressure steam at about 120 ° C to 200 ° C. Alternatively, after boiling for a predetermined time in hot water of 40 ° C. or higher, compression may be performed in a high temperature and high pressure environment of about 120 ° C. to 200 ° C. In any case, it is preferable that the upper mold body 5 and the lower mold body 9 are also heated to a temperature equivalent to the high temperature atmosphere.
In order to perform compression under such conditions, it is convenient to obtain a stable high-temperature and high-pressure environment by arranging the compressed wood molding die 1 and a press used for compression in a high-pressure vessel. .

When wood is compressed in the direction intersecting with the wood fibers, the voids in the wood fibers are reduced and compressed, but when the compressive force is released, it will return to the shape before compression to some extent. There is. It is necessary to fix the compressed shape so that the shape of the transferred mold surface is maintained even when the compression force is released by suppressing such return deformation.
As such a fixing means, it is known that a high temperature state is maintained for a predetermined time with the shape to be fixed, and then the mold is cooled to room temperature and demolded. The predetermined time is appropriately set according to the type of wood and the compression rate. For example, it is set in advance by conducting an experiment with the same material.

Therefore, in the state shown in FIG. 4C, the mold clamping is held for a predetermined time and left until the shapes of the core mold surface 5a, the end mold surface 5b, and the cavity mold surface 9a are transferred.
Then, after a certain time has elapsed, the supply of high-temperature and high-pressure steam is stopped, the mold is cooled while holding the mold clamp, and the moisture is dried. By this process, the transferred shape is fixed.

Next, a demolding process is performed.
In the demolding step, the upper mold body 5 and the lower mold body 9 are relatively spaced apart in the vertical direction to open the mold up and down, and the compressed wood molded article 100 is compressed into the core mold surface 5a, This is a step of releasing from the cavity mold surface 9a and taking it out of the compressed wood molding mold 1.
As described above, the compressed wood molded product 100 has a sufficiently fixed transfer shape, but the wood is a heterogeneous material having a large strength anisotropy and has a molding fluidity such as a synthetic resin. Therefore, even if the compression force is evenly received by the mold, it is difficult to equalize the residual stress inside the wood. Therefore, residual stress is generated in a direction that resists deformation along the mold surface. In other words, even when the shape is fixed along the mold surface, the load for pressing the mold surface differs depending on the location.
Therefore, when the concave shape and the convex shape are compressed by the opposing mold surfaces as in the present embodiment, the compressed wood molded product 100 has a concave cavity compared to the convex core die surface 5a. The mold surface 9a is fixed in a state where it is pressed more strongly. As a result, the outer bottom surface 100A, the outer side surfaces 100B, 100C, and the cavity mold surface 9a are fixed in a state where the adhesion is higher than the adhesion between the inner bottom surface 100a, the inner side surfaces 100b, 100c, and the core mold surface 5a. Is done.
That is, even if the mold is opened, the compressed wood molded product 100 is in the state of being taken on the cavity mold surface 9a side, and there is a possibility that it is difficult to remove the mold.

Therefore, in this embodiment, by providing the extrusion pin 11 that can extrude the compressed wood molded product 100 from the cavity mold surface 9a side, the compressed wood molded product 100 can be released smoothly.
That is, in the demolding step of the present embodiment, the upper mold body 5 and the holding plate 6 are slid upward and the push pin 11 protrudes upward.
At this time, in order not to leave a pin mark or the like on the outer bottom surface 100A by the push pin 11, the relative positional relationship between the upper mold body 5 and the push pin 11 is determined between the pin tip surface 11a and the core die surface 5a. Protruding in a state where the thickness of the sandwiched region is always equal to or greater than the thickness t.

As described above, the distance between the pin tip surface 11a and the core mold surface 5a may be t or more. However, if the pin is protruded in a shape slightly larger than t, the compressed wood molded product 100 is formed into a molding space. It is more preferable because it does not play with S and the pin tip surface 11a abuts only on a predetermined position of the bottom surface portion of the compressed wood molded article 100. The extrusion pin 11 only needs to be able to form a fine gap between the cavity mold surface 9a and the outer bottom surface 100A so as to trigger the mold release, so that the bottom portion of the compressed wood molded product 100 is slightly elastically deformed. A sufficient effect can be obtained even with an extrusion amount of.
However, as shown in the drawing, the entire compressed wood molded article 100 may be extruded to a height that can be clearly lifted from the cavity mold surface 9a, for example, from several millimeters to several centimeters. If it does so, in order to carry out the compressed wood molded article 100 outside as shown by the arrow, it becomes easy to hold and is convenient.

Next, specific timing of movement of the push pin 11 and the upper mold body 5 will be described with reference to FIG.
In FIG. 5, a broken line Q ₀ Q ₁ Q ₂ Q ₃ indicates the moving position of the pin tip surface 11 a of the push pin 11 by a height measured from an appropriate reference position. Further, the polygonal line P ₀ P ₁ P ₂ P ₃ P ₄ P ₅ shows the moving position of the core mold surface 5a at the position facing the pin tip surface 11a by the height measured from the same reference position. .
Here, the origin O of the time axis indicates the operation start time, the time T ₁ is the time when the compression starts, the time T ₂ is the time when the compression in the state of FIG. 4C is completed, and the time T ₃ is the end of the fixing process. That is, the time at which the compression process is completed and the demolding process is started is shown.
Note that FIG. 5 is a schematic diagram, and a monotonous movement change is represented by a straight line. However, a movement represented by a monotonic curve on the graph may be performed.

Change from time O to T ₃ is a graph of the description of the compression process.
That is, the core mold surface 5a is, _{z 2 (However,} z 0> _{z 2)} from a height _{z 0} descends, during the time _(T 3 -T _2), is held at a height _{z 2.}
On the other hand, the pin tip surface 11a is held at a constant height z ₁ (however, t = z ₂ −z ₁ ) from time O to time T ₃ .

Demolding process is started at time T _3.
First, the core mold surface 5a is pulled up along the straight line P ₃ P _{4, and} when the position z ₀ before starting compression is reached at time T ₆ , the position is held.
On the other hand, the pin tip surface 11a is equal to or time _{T 3,} from time _T 4 to slightly delay _{(T 4} ≧ _{T 3),} protrudes along a straight line _Q 1 _{Q 2,} the time _{T 5} (however, _{T 5} ≦ When reaching the height z ₃ at T ₆ ), the protrusion is stopped.
In this way, the extrusion pin 11 is projected at the same time as the upper mold body 5 is raised or slightly delayed so that the gap between the pin tip surface 11a and the core mold surface 5a becomes greater than the thickness t. Can be held. Therefore, the compressed wood molded product 100 can be released from the cavity mold surface 9a without applying a compression load by the push pin 11 to the outer bottom surface 100A of the compressed wood molded product 100.

Here, the time T _4, the distance between the pin tip surface 11a and the core mold surface 5a is, so that certainly greater than the thickness t, it is preferable to delay with respect to the time T _3. Then, even when the extrusion speed of the extrusion pin 11 cannot be accurately controlled, it is possible to prevent the compression load from the extrusion pin 11 from being applied to the compressed wood molded article 100. Therefore, the outer bottom surface 100A can be removed from the mold without changing the pin mark of the extrusion pin 11 and the like with a good appearance.

  In addition, when the movement amount of the push pin 11 can be accurately controlled, even if the movement start time is set at the same time, the gap between the push pin 11 and the upper mold body 5 can be reliably increased by making a difference between t and t. Can be bigger. FIG. 6 is a schematic graph for explaining an example when such a moving speed difference is provided. The horizontal axis indicates time, and the vertical axis indicates the height in the vertical direction from an appropriate reference position.

In FIG. 6, a broken line Q ₀ q ₁ q ₂ Q ₃ indicates the moving position of the pin tip surface 11 a of the push pin 11 by a height measured from an appropriate reference position. Further, a polygonal line _{P 0 P 1 P 2 P 3} P 4 P 5 represent the same polygonal line as FIG.
In this case, the push pin 11 and the upper mold body 5 are simultaneously moved at time T ₃ , but the movement speed of the push pin 11 is set lower than the movement speed of the upper mold body 5. That is, in FIG. 6, the time T ₇ at which the point q ₂ is reached is set so that the slope of the straight line q ₁ q ₂ representing the moving speed of the push pin 11 is smaller than the slope of the straight line P ₃ P ₄ .
In this way, the gap between pin tip surface 11a and the core mold surface 5a is, t becomes at time T _3, continue to increase than t over time.

  As described above, according to the compressed wood molding die 1 of the present embodiment and the method for producing a compressed wood molded product using the same, by providing an extrusion pin on the mold surface having a concave shape, There is an advantage that the production efficiency can be improved because the three-dimensional shaped compressed wood molded product that is easily adhered to the mold having the shape can be easily released and the demolding process can be performed smoothly.

  In the above description, the outer bottom surface 100A of the compressed wood molded article 100 has been described as a surface that requires a good appearance. However, when the outer bottom surface 100A is the back surface, and particularly good appearance characteristics are not required, As long as cracks or the like do not occur in the compressed wood molded article 100, the extruded pin 11 may project the pin mark so as to make a mark. That is, in the demolding step, the protrusion may be performed such that the gap between the pin tip surface 11a and the core mold surface 5a is smaller than t.

In the above description, the case where the two mold surfaces are a female mold surface having a concave shape and a male mold surface having a convex shape has been described. It may be modified and applied so that the shape is mixed and a plurality of portions where the concave shape and the convex shape face each other are provided.
FIG. 7 is a schematic cross-sectional view for explaining a modification of the compressed wood molding die according to the embodiment of the present invention.

The compressed wood molding die 50 of the present modification is for molding a compressed wood molded product having irregularities with a substantially S-shaped cross section, and includes an upper mold part 50A and a lower mold part 50B.
The upper mold portion 50A includes a concave concave mold surface portion 50b (concave mold surface) and a convex convex mold surface portion 50d (convex mold surface). A push pin 51A (push member) that can be advanced and retracted is provided. The tip surface of the extrusion pin 51A is formed with a pin tip surface 51a aligned with the concave mold surface portion 50b.
In addition, the lower mold part 50B is a convex convex mold surface part 50a (convex mold) that is opposed to the concave mold surface part 50b and the convex mold surface part 50d of the upper mold part 50A. Surface) and a concave concave mold surface portion 50c (concave mold surface), and an extrusion pin 51B (extrusion member) that can be advanced and retracted to the concave mold surface portion 50c. The tip surface of the extrusion pin 51B is formed with a pin tip surface 51b aligned with the concave mold surface portion 50c.
The compressed wood molding die 50 is surrounded by the concave die surface portion 50b, the pin tip surface 51a, the convex die surface portion 50d, the concave die surface portion 50c, the pin tip surface 51b, and the convex die surface portion 50a. A forming space R can be formed.

  According to such a compressed wood molding die 50, since the compressed wood is provided with the extrusion pins 51A and 51B on the concave mold surface portions 50b and 50c, respectively, which are difficult to release, compression is performed in the demolding step. The wood molded product can be easily released, and the production efficiency can be improved.

  In the above description, an example in which one extrusion member is provided for each concave mold surface has been described. However, a plurality of extrusion members are provided in consideration of a load balance for mold release. You may do it.

It is a cross-sectional explanatory drawing of the perpendicular direction for demonstrating the structure of the metal mold | die for compression wood shaping | molding which concerns on embodiment of this invention. It is the perspective explanatory view for demonstrating an example of the compressed wood molded product manufactured using the metal mold | die for compressed wood shaping | molding which concerns on embodiment of this invention, and the perspective explanatory drawing seen from the back surface side. It is process explanatory drawing for demonstrating each process in the manufacturing method of the compressed wood molded article which concerns on embodiment of this invention. It is process explanatory drawing for demonstrating each process similarly following FIG. It is a graph which shows typically a mode of a convex metallic mold surface and a movement of an extrusion member in a manufacturing method of a compressed wood molded article concerning an embodiment of the present invention. It is a typical graph for demonstrating the example at the time of providing a moving speed difference between the convex-shaped metal mold | die surface and the extrusion member in the manufacturing method of the compressed wood molded article which concerns on embodiment of this invention. It is typical sectional drawing for demonstrating the modification of the metal mold | die for compression wood shaping | molding which concerns on embodiment of this invention.

Explanation of symbols

1, 50 Compressed wood molding die 2, 50A Upper die portion 3, 50B Lower die portion 5 Upper die body 5a Core die surface (male die surface)
5b End mold surface 5c Side slide part 6 Holding plate 6a Slide guide hole 6b Inclined surface 6c Plate lower surface 6d Slide rod guide hole 6e Positioning hole 7 Slide rod 8 Guide pin 9 Lower mold body 9a Cavity mold surface (female mold Mold surface)
9b Mold body upper surface 10 Lower mold holding plate 10a Plate upper surface 11, 51A, 51B Extrusion pin (extrusion member)
11a, 51a, 51b Pin tip surface 13 Blank member (wood)
50a, 50d Convex mold surface (convex mold surface)
50b, 50c Concave mold surface (concave mold surface)

Claims (4)

A compressed wood molding die for forming a compressed wood molded product having a three-dimensional shape by moving at least two mold surfaces in opposite directions and compressing the wood,
The two mold surfaces have at least a pair of a concave shape and a convex shape substantially corresponding to each other at opposite positions;
A compressed wood molding die, wherein an extrusion member for releasing the compressed wood is provided in a region where the concave shape is formed in at least one of the two die surfaces.   2. The compressed wood molding die according to claim 1, wherein the two die surfaces are a female die surface having a concave shape and a male die surface having a convex shape. At least two mold surfaces have at least a pair of a concave shape and a convex shape that substantially correspond to each other at an opposing position, and at least one of the two mold surfaces has an area in which the concave shape is formed in the opposing direction. A method for producing a compressed wood molded article using a compressed wood molding die provided with an extrusion member that can be extruded toward
A compression step of compressing the wood placed between the two mold surfaces into the three-dimensional shape by moving the two mold surfaces in opposite directions;
And a demolding step of removing the wood compressed in the compression step by separating the two mold surfaces in the opposing direction and ejecting the extrusion member in the opposing direction to release the mold. A method for producing a compressed wood molded product.   The method for producing a compressed wood molded article according to claim 3, wherein, in the demolding step, the extruded member is protruded with a slight delay from the start of the separation of the two mold surfaces.

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