Three-dimensional curved surface formed object having a wood corrugated plate material, a forming method thereof, and a mold for forming a three-dimensional curved surface formed object

Abstract

To provide technology allowing a molded product with a three-dimensional curve surface, which is difficult to be produced using one piece of thin plate material with a flat surface, to be arbitrarily and easily produced in low cost without using energy such as huge amount of electric power and a special device and the like by using one piece of ligneous wave-like plate material for a three-dimensional curve surface molding.SOLUTION: A molded product 10A with a three-dimensional curve surface made of ligneous wave-like plate material is molded using ligneous wave-like plate material which is ligneous plate material of which a wave structure configured by peaks and troughs is consecutively formed in a constant direction, the molded product having a configuration provided with a three-dimensional curve surface. The ligneous wave-like plate material can be produced through: a cylindrical product molding process; a setting process of setting the cylindrical product in a mold; an immersing process of immersing the cylindrical product in the immersion medium; and then a dry process.SELECTED DRAWING: Figure 2A

Description

Technical Field

[0001] The present invention relates to a three-dimensional curved surface formed object having a wood corrugated board, a method for forming the same, and a mold for forming a three-dimensional curved surface formed object, and particularly relates to a technology capable of obtaining a formed object having an arbitrary three-dimensional curved surface from a single wood corrugated board.

Background Art

[0002] Conventionally, for three-dimensional surface forming of wood materials, boiling of materials, use of high frequency and a press machine, a mold that can withstand high pressure, etc. are required. That is, its forming and manufacturing require a large amount of electric power, power, special devices and tools, and are costly, and are not technologies that can be easily carried out. In particular, it is difficult to form a three-dimensional curved surface shape from a single veneer in a flat state.

[0003] On the other hand, the applicant, Imai Sangyo Co., Ltd., has long developed a continuous bending processing technology for wooden thin plates. This is a corrugated board made of wood, and it is a material that has both functionality and design, in which a wave shape is continuously formed in one direction on a reference plane defined by the vascular bundle direction, which is the direction of extension of the vascular bundles of the wood, and a direction orthogonal thereto. This material is named e.wood+ (registered trademark), and various application products such as panel shapes, laminated board shapes, and assembled body shapes using this material have been developed and provided (see the following patent documents and non-patent documents).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Non-Patent Documents

[0005] [Non - Patent Document 1] URL of the website of Imai Sangyo Co., Ltd.: http: / / www.imaisangyou.com / [Non - Patent Document 2] URL of the website of WOOD MAKER JAPAN Co., Ltd.: http: / / woodmaker.jp / material / [Summary of the Invention] [Problems to be Solved by the Invention]

[0006] It would be convenient to have a technology that can more easily and at a lower cost perform three - dimensional curved surface forming of wood materials, especially forming a three - dimensional curved surface shape from a single veneer in a planar state, without using power, motive power, special devices, or tools as in the prior art. On the other hand, regarding the above - mentioned e.wood+(registered trademark), which is a wood corrugated board material, if further utilization technologies beyond its use for forming panel shapes, laminated board shapes, assembled body shapes, etc. can be obtained, the utilization, popularization, and expansion of this material can be further promoted. Conventionally, with this material, a curved surface (developable surface) that can be formed without accompanying planar expansion and contraction has been formed and applied to products, but the development of three - dimensional curved surface forming technology has not been carried out yet.

[0007] Therefore, the problem to be solved by the present invention is, based on the situation of such prior art, to provide a technology that can more easily and at a lower cost perform three - dimensional curved surface forming of wood materials, especially forming a three - dimensional curved surface shape from a single veneer in a planar state, which is difficult to form with a single thin wood board, without using a large amount of energy such as power and motive power and special devices and tools as in the prior art. [Means for Solving the Problems]

[0008] As a result of studying the above problems, the inventor of the present application conceived that a desired three-dimensional curved surface shape can be obtained by controlling the deformation action due to cell expansion when the wood corrugated board absorbs moisture. That is, it is a method of obtaining a three-dimensional curved surface molded product through a process of controlling a wood corrugated board having a property of returning to a flat surface when absorbing moisture into an arbitrary shape using a molding die, and then fixing the shape by drying.

[0009] And the action and effect were confirmed by experiments, and based on this, the present invention was completed. That is, the invention claimed in the present application, or at least the disclosed invention, as means for solving the above problems is as follows.

[0010] 〔1〕 A molded product provided with a three-dimensional curved surface, which is molded using a wood corrugated board, wherein the wood corrugated board has a corrugated structure composed of mountains and valleys continuously formed in a certain direction. 〔2〕 The molded product provided with a three-dimensional curved surface made of a wood corrugated board according to 〔1〕, wherein the wood corrugated board is wound in a direction intersecting the corrugated structure, and both ends are adhered to form a substantially cylindrical shape. 〔3〕 The molded product provided with a three-dimensional curved surface made of a wood corrugated board according to any one of 〔1〕 and 〔2〕, wherein the wood corrugated board is e.wood+(registered trademark) manufactured by Imai Sangyo Co., Ltd. 〔4〕 A method for forming a molded article having a three-dimensional curved surface using a wood corrugated board material, which is a wood board material having a wavy structure composed of mountains and valleys continuously formed in a certain direction, the method comprising: a cylindrical object forming process of winding the wood corrugated board material in a direction intersecting the wavy structure and bonding both ends to form a substantially cylindrical object; a setting process of setting the cylindrical object in a molding die; an immersion process of immersing the set cylindrical object in an immersion medium to promote deformation conforming to the molding die; and a drying process of drying the immersed cylindrical object while maintaining the set state. A method for forming a molded article with a three-dimensional curved surface made of a wood corrugated board material, characterized by comprising the above processes.

[0011] 〔 5 〕 In the dipping process, a dipping treatment is performed in which the cylindrical object contains a dipping medium necessary for expansion to sufficiently contact the molding die. The molding method of the molded product provided with a three-dimensional curved surface made of a wood corrugated board according to 〔 4 〕. 〔 6 〕 The adhesion in the cylindrical object forming process is a temporary fixing using a temporary fixing adhesive. The molding method of the molded product provided with a three-dimensional curved surface made of a wood corrugated board according to any one of 〔 4 〕 and 〔 5 〕. 〔7 〕 After the drying process, a post-drying process is provided, and the post-drying process includes a process of removing the temporary fixing and a final bonding process for both ends. 6 〕 The method for forming a three-dimensional curved surface product provided with a wooden corrugated board according to 〔

[0012] 〔 8 〕 As the forming die, an outer die that restricts deformation of the cylindrical object to the outside is used. 4 〕, 〔 5 〕, 〔 6 〕, 〔 7 〕 The method for forming a three-dimensional curved surface product provided with a wooden corrugated board according to any one of 〔 〔 9 〕 As the forming die, in addition to the outer die, an inner die that restricts deformation of the cylindrical object to the inside is used. 8 〕 The method for forming a three-dimensional curved surface product provided with a wooden corrugated board according to 〔 〔 10 〕 Implementation of the method for forming a molded article with a three-dimensional curved surface made of a wood corrugated board material according to any one of [4], [5], [6], [7], [8], [9] A mold for forming a three-dimensional curved surface product, characterized by being used for 〔 11 〕 The molding of the molded article with a three-dimensional curved surface made of a wood corrugated board material according to any one of [1], [2], [3] is formed using a predetermined molding die, and a molding die for a molded article with a three-dimensional curved surface, characterized by being such a die.

Advantages of the Invention

[0013] Since the three-dimensional curved surface product made of a wooden corrugated board, its forming method, and the mold for forming a three-dimensional curved surface product according to the present invention are configured as described above, according to these, the three-dimensional curved surface forming of a wooden material, particularly the three-dimensional curved surface shape forming from a single veneer in a flat state, can be performed more easily and at a lower cost without using electric power, power, special devices, or tools as in the prior art. That is, by using a wooden corrugated board for the three-dimensional curved surface forming from such a single material, a three-dimensional curved surface product that is difficult to form with a single thin flat board can be obtained arbitrarily, easily, and at a low cost without using energy such as a large amount of electric power and power, or special specification devices, molds, etc.

[0014] Conventionally, it has been difficult to form a three-dimensional curved surface from a flat veneer. However, in the present invention, by using a wood corrugated board material, a three-dimensional curved surface can be obtained through an extremely easy operation of soaking it in water and then drying it. Moreover, various curved surfaces can be arbitrarily formed by changing the shape of the mold. By using the present invention, it is possible to obtain a molded product with a highly designed shape that has no precedent in wood materials, and it can be expected to be applied to product development in a wide range of fields.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2A

Figure 2B

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Figure 15

Embodiments for Carrying Out the Invention

[0016] Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing the structure of a wooden corrugated board used for a molded article provided with a three-dimensional curved surface made of a wooden corrugated board of the present invention. Also, FIGS. 2A and 2B are explanatory diagrams showing examples of molded articles provided with a three-dimensional curved surface made of a wooden corrugated board of the present invention. As shown in these, the molded articles 10A and 10B provided with a three-dimensional curved surface made of a wooden corrugated board are formed using a single wooden corrugated board 5, which is a wooden board in which a corrugated structure 3 consisting of ridges 1 and valleys 2 is continuously formed in a certain direction, and mainly comprises a three-dimensional curved surface. The basic shape for obtaining the molded article 10A etc. made of a wooden corrugated board is a cylindrical shape formed by a single corrugated board, but the molded article 10A etc. of the present invention is a molded article in which an arbitrary three-dimensional curved surface shape is formed based on this cylindrical shape. Note that a three-dimensional curved surface is a surface that cannot be formed by deforming a plane, that is, a surface that is not a developable surface.

[0017] The three-dimensional curved surface formed article 10A etc. made of the present wooden corrugated board material has a substantially cylindrical shape, where the wooden corrugated board 5 is wound in a direction intersecting the corrugated structure 3 and both end portions 4a, 4z are adhered. Here, the term "substantially cylindrical" does not include a curved surface (developable surface) obtained by deforming a plane like a complete cylinder, but refers to a shape in which a three-dimensional curved surface is formed by applying deformation to a cylinder which is the above-mentioned "basic shape". As the wooden corrugated board 5 which is the material of the three-dimensional curved surface formed article 10A etc. made of the present wooden corrugated board material, the above-mentioned e.wood+(registered trademark) can be preferably used.

[0018] The wooden corrugated board 5 illustrated in FIG. 1 has a rectangular shape with the forming direction of the corrugated structure 3 as the long side, and by being wound in the long side direction, a cylinder which is the above-mentioned "basic shape" can be easily formed, so it is a suitable form. However, the form of the wooden corrugated board is not limited to this, and it may be a rectangular shape with the forming direction of the corrugated structure as the short side, or a parallelogram shape or a trapezoid shape, or even any arbitrary shape, and is not excluded from the present invention. Also, the three-dimensional curved surface formed articles 10A, 10B made of the wooden corrugated board illustrated in FIGS. 2A and 2B are merely examples, and the present invention is not limited thereto.

[0019] The three-dimensional curved surface formed article 10A etc. made of the wooden corrugated board material of the present invention is basically in a substantially cylindrical form, but an article obtained by applying some processing thereto is also within the scope of the three-dimensional curved surface formed article made of the wooden corrugated board material of the present invention. For example, a form in which a three-dimensional curved surface formed article made of the wooden corrugated board material formed in a substantially cylindrical shape (hereinafter, also simply referred to as "formed article") is cut in a certain direction such as its height direction and an opening is provided, an open form, etc.

[0020] Figure 3 is a flowchart showing the basic configuration of the method for forming a three-dimensional curved surface product made of a wood corrugated board according to the present invention. In the description, the reference numerals in the previously shown drawings such as FIG. 1 may also be used. As shown in the figure, the present method for forming a product P100 is a method for forming a product 10 having a three-dimensional curved surface using a wood board material, that is, a wood corrugated board 5 in which a corrugated structure 3 composed of ridges 1 and valleys 2 is continuously formed in a certain direction. The method includes a cylindrical object forming process P10 of winding the wood corrugated board 5 in a direction intersecting the corrugated structure 3 and bonding both ends 4a and 4z to form a cylindrical object 6 having a substantially cylindrical shape, a setting process P20 of setting the cylindrical object 6 in a forming die 7, an immersion process P30 of immersing the set cylindrical object 6 in an immersion medium 8 to promote deformation conforming to the forming die 7, and a drying process P40 of drying the immersed cylindrical object 6 while maintaining the set state. This is the main configuration.

[0021] The operation of this flow with such a configuration will be described. First, in the cylindrical object forming process P10, the wood corrugated board 5 is wound in a direction intersecting the corrugated structure 3, and both ends 4a and 4z are bonded to form a cylindrical object 6 having a substantially cylindrical shape. In the setting process P20, the cylindrical object 6 formed in the cylindrical object forming process P10 is set in the forming die 7. In the immersion process P30, the cylindrical object 6 set in the forming die 7 in the setting process P20 is immersed in the immersion medium 8 while maintaining the set state to promote deformation conforming to the forming die 7. And in the drying process P40, the cylindrical object 6 after immersion in the immersion process P30 is dried while maintaining the set state. By going through these processes P10 to P40, the wood corrugated board 5 is formed into a product 10 having a three-dimensional curved surface.

[0022] The method P100 for forming a three-dimensional curved surface product made of a wood corrugated board according to the present invention controls the characteristic and deformation action of the wood corrugated board 5 to return to a flat surface due to cell expansion when it absorbs moisture into an arbitrary shape with the forming die 7 to obtain a three-dimensional curved surface product 10. Therefore, the immersion medium 8 used in the immersion process P30 may be a medium having sufficient moisture to obtain such an action (that is, water may be used. Hereinafter, it will be described with the immersion medium 8 = water). Also, the number of wood corrugated boards 5 used in the forming method of the present invention is basically one.

[0023] In the immersion process P30 of the forming method P100 for forming a three-dimensional curved surface of a wooden corrugated board material, an immersion treatment is performed in which an immersion medium 8 necessary for expansion to a sufficient contact with the forming die 7 is included in the cylindrical object 6. That is, by passing through this immersion process P30, the cylindrical object 6 comes to contain the immersion medium 8 inside it, and the amount of the immersion medium 8 to be contained is an amount sufficient to expand the cylindrical object 6 to a sufficient contact with the inner wall of the forming die 7 on which the cylindrical object 6 is set. The conditions for obtaining impregnation with such a sufficient amount of the immersion medium 8 can be appropriately adjusted according to the length of the immersion time and the temperature of the immersion medium 8.

[0024] The adhesion in the cylindrical object forming process P10 may be a temporary fixing using a temporary fixing adhesive. This process P10 is merely an adhesion process for temporarily fixing both end portions 4a and 4z of the wooden corrugated board material 5 through the subsequent setting process P20, immersion process P30, and drying process P40, and for efficiently and smoothly advancing these processes P20, P30, and P40. The final adhesion will be described later.

[0025] FIG. 4 is a flowchart showing a more detailed configuration example of the forming method P150 for a three-dimensional curved surface provided with a wooden corrugated board material according to the present invention. As shown in the figure, in addition to the respective processes P10, P20, P30, and P40 described in FIG. 3, the forming method P150 is characterized in that a post-drying process P50 is provided after the drying process P40, and the post-drying process P50 includes a process P51 for removing the temporary fixing and a final adhesion process P53 for both end portions.

[0026] With such a configuration, in this process flow, a dried molded article r10 having a three-dimensional curved surface is obtained from the wood corrugated board 5 through the processes P10, P20, P30, and P40 also shown in FIG. 3. Although this dried molded article r10 has the desired three-dimensional curved surface fixed in form, it is still temporarily fixed. When this is subjected to the post-drying process P50, in the temporary fixing removal process P51 therein, the adhesion state due to the removal of the temporary fixing between the ends 4a - 4z in the molded article r10 is once released, and in the final adhesion process P53, the final adhesion between both ends is performed. Then, if necessary, other processes are performed, and finally, a molded article 110 having a three-dimensional curved surface made of a wood corrugated board is obtained.

[0027] Note that the temporary fixing in the cylindrical object forming process P10 is considered in view of the possibility that the ends of the cylindrical object 6 after each process will ultimately be subjected to necessary preparation processes to obtain the completion of the molded article 110. If such a preparation process is necessary, it is performed between the temporary fixing removal process P51 and the final adhesion process P53 of both ends. As will also be described later in the examples, it is appropriately possible to obtain the molded article 110 by adding a finishing process, a painting process, etc. after the final adhesion process P53.

[0028] FIG. 5 is an explanatory diagram conceptually showing the configuration of a molding die used in the molding method of a molded article having a three-dimensional curved surface made of the wood corrugated board of the present invention described above. As shown in (a) in the figure, the molding die 17 can be an outer die that restricts the deformation of the cylindrical object to the outside. On the other hand, as shown in (b) in the figure, in addition to the outer die 27X, the molding die may also use an inner die 27E that restricts the deformation of the cylindrical object to the inside. The molding die for a molded article having a three-dimensional curved surface used in the present invention, including what is shown in this figure, is also within the scope of the present invention.

Examples

[0029] Hereinafter, examples of the present invention will be described, but the present invention is not limited thereto. 〔Example 1: Molding of a lantern-shaped molded article having a three-dimensional curved surface〕 As an example of a method for forming a three-dimensional curved surface-equipped molded article, a method for forming a lantern-shaped molded article will be described with reference to the drawings. FIG. 6 is an explanatory view showing a state in which a wooden corrugated plate material as a material is formed into a cylindrical shape. A single wooden corrugated plate material 35 is wound in a direction intersecting the corrugated structure 33, and both ends are adhered (temporarily fixed) to form a cylindrical tube 36. That is, it is a state in which the tube forming process is completed.

[0030] FIG. 7 is an explanatory view showing the structure of a molding die for forming a lantern-shaped molded article. This molding die 37 is formed to accommodate and hold the cylindrical tube 36 inside a lantern shape in order to obtain a lantern-shaped molded article that is a closed cylindrical molded article in the circumferential direction. The door 37d is used when accommodating and removing the cylindrical tube 36, and the figure shows a state in which the left and right doors 37d, 37d are opened. Note that the structure of this molding die 37 is merely an example. The same applies to other molding dies shown in the descriptions of Examples 2 and 3.

[0031] FIG. 8 is an explanatory view showing a state in which a cylindrical tube is set in the molding die. Also, FIG. 9 is a view showing a state in which the door of the molding die in which the cylindrical tube is set is closed. FIG. 9 shows a state in which the setting process is completed, the immersion process for deformation has not yet been performed, and no deformation has occurred in the accommodated cylindrical tube 36.

[0032] FIG. 10 is an explanatory view showing a state in which the immersion process is completed. After the cylindrical tube 36 in the state of being accommodated in the molding die 37 (setting process, FIG. 9) is immersed in water as an immersion medium for a certain period of time while being set and then pulled out of the water, it shows the state. Inside the molding die 37, the expanded cylindrical tube q36 that has sufficiently abutted against the inside of the lantern-shaped molding die 37 after the immersion process is still accommodated inside. After this, the expanded cylindrical tube q36 undergoes a drying process or the like and becomes a completed lantern-shaped molded article 310 (since it is the same as 10A in FIG. 2A, illustration is omitted).

[0033] 〔Example 2: Molding of a trumpet-shaped three-dimensional curved surface-equipped molded article〕 As an example of a method for forming a three-dimensional curved surface-equipped molded article, a method for molding a trumpet-shaped molded article will be described with reference to the drawings. The process of forming the cylindrical object is the same as in Example 1 (see Fig. 6). Figs. 11 and 12 are explanatory views showing the structure of a molding die for molding a trumpet-shaped molded article, and are views showing the inner die and the outer die, respectively. Also, Fig. 13 is an explanatory view showing a state in which the cylindrical object is set in the outer die, Fig. 14 is an explanatory view showing a state in which the inner die is further set in the state of Fig. 13.

[0034] The method of using the present molding dies 47E (inner die) and 47X (outer die) is as follows: First, the outer die 47X is set so as to cover the cylindrical object 46, and after subjecting it to the immersion process to obtain the expanded cylindrical object q46 (Fig. 13), the inner die 47E is set from the inside of the expanded cylindrical object q46 (Fig. 14). The subsequent immersion process may be performed, performed as necessary, or not performed. After that, the expanded cylindrical object q46 undergoes a drying process or the like and becomes the completed trumpet-shaped molded article 410 (since it is the same as 10B in Fig. 2B, illustration is omitted).

[0035] 〔Example 3 Other Shape Examples〕 Fig. 15 is an explanatory view showing an example of a three-dimensional curved surface-equipped molded article made of a wooden corrugated board that can be molded according to the present invention. As shown in the figure, according to the present invention, in addition to the lantern shape and trumpet shape shown in Examples 1 and 2, molded articles of various shapes can be molded.

Industrial Applicability

[0036] According to the three-dimensional curved surface-equipped molded article made of a wooden corrugated board of the present invention, its molding method, and the molding die for a three-dimensional curved surface-equipped molded article, a wooden corrugated board is used for three-dimensional curved surface molding, and a three-dimensional curved surface molded article that is difficult to mold with a single flat thin board can be obtained arbitrarily, easily, and at low cost without using a large amount of energy such as electric power or special equipment. In particular, it is an invention with high industrial applicability in the manufacturing, use fields, and all related fields of articles with high design requirements, such as lighting fixtures, interior goods, and woodcrafts.

Description of Symbols

[0037] 1…Mountain 2…Valley 3, 33…Wave-like structure 4a, 4z…Both ends 5, 35…Wooden wave-like board material 6, 36…Cylindrical object 7, 17, 37…Molding die for forming 8…Impregnation medium 10, 10A(310), 10B(410), 110…Formed product equipped with a three-dimensional curved surface made of wooden wave-like board material 27E, 47E…Molding die for forming (inner die) 27X, 47X…Molding die for forming (outer die) 37d…Door of the molding die for forming P10…Process of forming a cylindrical object P20…Setting process P30…Impregnation process P40…Drying process P50…Process after drying P51…Process of removing temporary fixing P53…Final adhesion process P100, P150…Forming method of a formed product equipped with a three-dimensional curved surface made of wooden wave-like board material q36, q46…Expanded cylindrical object r10…Formed product equipped with a three-dimensional curved surface made of dried wooden wave-like board material

Claims

1. A three-dimensional curved surface formed using a wood corrugated board, which is a wood board material having a corrugated structure consisting of mountains and valleys continuously formed in a certain direction, and characterized by having a three-dimensional curved surface.

2. The three-dimensional curved surface formed using a wood corrugated board according to Claim 1, characterized in that the wood corrugated board is wound in a direction intersecting the corrugated structure, and both ends are adhered to form a substantially cylindrical shape.

3. The three-dimensional curved surface formed using a wood corrugated board according to any one of Claims 1 and 2, characterized in that the wood corrugated board is e.wood+(registered trademark) manufactured by Imai Sangyo Co., Ltd.

4. A method for forming a molded article having a three-dimensional curved surface using a wood corrugated board, which is a wood board material having a corrugated structure consisting of mountains and valleys continuously formed in a certain direction. The method includes a cylindrical article forming process of winding the wood corrugated board in a direction intersecting the corrugated structure and adhering both ends to form a substantially cylindrical cylindrical article, a setting process of setting the cylindrical article in a molding die, an immersion process of immersing the set cylindrical article in an immersion medium to promote deformation conforming to the molding die, and a drying process of drying the immersed cylindrical article while maintaining the set state.

5. The method for forming a three-dimensional curved surface formed using a wood corrugated board according to Claim 4, characterized in that in the immersion process, an immersion treatment is performed to include an immersion medium necessary for expansion to sufficiently contact the cylindrical article with the molding die.

6. The method for forming a three-dimensional curved surface formed using a wood corrugated board according to any one of Claims 4 and 5, characterized in that the adhesion in the cylindrical article forming process is a temporary fixation using a temporary fixing adhesive.

7. After the drying process, a post-drying process is provided, and the post-drying process includes a process of removing the temporary fixation and a process of finally adhering both ends. The method for forming a three-dimensional curved surface formed using a wood corrugated board according to Claim 6 is characterized by this.

8. The method for forming a three-dimensional curved surface formed using a wood corrugated board according to any one of Claims 4, 5, 6, and 7, characterized in that an outer die that restricts deformation of the cylindrical article to the outside is used as the molding die.

9. The method for forming a three-dimensional curved surface formed product made of a wood corrugated board material according to claim 8, characterized in that, as the forming die, in addition to the outer die, an inner die for restricting deformation of the tubular body to the inside is used.

10. A forming die for a three-dimensional curved surface formed product, characterized by being used in the implementation of the method for forming a three-dimensional curved surface formed product made of a wood corrugated board material according to any one of claims 4, 5, 6, 7, 8, and 9.

11. A forming die for a three-dimensional curved surface formed product, characterized in that the forming of the three-dimensional curved surface formed product made of a wood corrugated board material according to any one of claims 1, 2, and 3 is formed using a predetermined forming die, and being such a die.

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