JP2003251611A - Method and apparatus for manufacturing of curved laminated wood - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for manufacturing a curved laminated wood capable of manufacturing the laminated wood having a very smaller curvature radius than conventionally by uniform adhesion without inviting damage to a material by using a comparatively thick sawn plate suitable for a structural laminated wood. <P>SOLUTION: A sawn plate being the material is obtained by sawing and drying. The sawn plate is classified by mechanical grading and only those of <5000 N/mm<SP>2</SP>in bending Young's modulus are selected. Adhesives are applied to a surface of the sawn plate and they are stacked from down to up in an order from those of less bending young's modulus. They are pressured in a direction crossing almost at a right angle a curved surface with respective cylinders (the arrows) via pressurizing pieces 11a to 11n. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method and a manufacturing apparatus for manufacturing a curved laminated lumber, and in particular, it is possible to manufacture a curved laminated lumber having an unprecedented curvature.

[0002]

2. Description of the Related Art With the diversification of building technology, the development of building materials is remarkable every day. In particular, recent new building materials using various chemically synthesized materials are characterized not only in strength but also in excellent weight reduction and combustion resistance. However, no matter how the development technology of new building materials is improved, there are merits and demerits, and none of them has been developed that is superior to the comprehensive advantages of wood produced by natural power.

Laminated wood is one of the building materials that combines ancient wood technology with recent building material technology. The laminated wood is
Since most of it is wood itself, it inherits the original advantages of wood and has the following advantages when compared with solid wood. (1) Since the structure has no concentration of defects, the quality of the entire material can be kept uniform, and the strength is higher than that of the solid material of the same standard. (2) Since it is manufactured by combining small pieces including waste wood, large-sized wood can be manufactured at a lower cost than solid wood. (3) Although the shape is limited, not only a rectangular parallelepiped but also a curved one can be manufactured.

There are various techniques for manufacturing the above-mentioned curved laminated wood. For example, there is a manufacturing method disclosed in Japanese Laid-Open Patent Publication No. 11-19904. In this manufacturing method, in order to press the laminated wood, the laminated wood is sandwiched by a plurality of press devices which are radially projected from a pedestal curved in an arc shape and are spaced apart from each other, and each press device presses a partial portion. It is a thing. However, in this manufacturing method, if the radius of curvature is extremely large, it can be inferred that there are few problems, but it is necessary to strengthen the tightening as the radius of curvature becomes smaller, and (1) only the tightened portion is cracked.
It is clear that problems such as (2) insufficient adhesion of parts not using a press machine, (3) insufficient strength due to uneven adhesion, and inability to withstand load, etc. will occur. is there.

Further, as means for correcting such non-uniformity of pressurization, for example, as shown in Japanese Unexamined Patent Publication (Kokai) No. 5-305602, both convex and concave forms are provided. There is a method in which the laminated material is sandwiched from above and below by a pressurizing device and the whole is pressurized.

However, when this method is applied to the production of laminated wood having a certain thickness, although it can be applied to an extremely large radius of curvature as in the case of the above-mentioned method, as the radius of curvature decreases, (1 ) A strong pressing force is required (2) A problem arises such that a concentrated load is applied to the minimum curved portion before the curved portion is completely bent and the portion is cracked.

[0007] Although it is possible to apply the laminated material using an extremely thin sawn plate having a thickness of about 1 mm, it is possible to manufacture a laminated material with such a thin material to a certain extent for use as a structural material or the like. In order to do so, it is necessary to use an extremely large number of sheets and a large amount of adhesive, which is uneconomical, and more uniform bonding is required due to the increase in the number of bonding surfaces, and in terms of price and technology. Not practical.

In order to use the laminated wood as a structural material, the laminated wood must have a thickness of 50 mm or more. For that purpose, the thickness of the sawing board used as a material is 5 mm.
It is desirable that the thickness is about mm or more. Conventionally, the relationship between the thickness of a lumber board and the minimum radius of curvature of a curved part according to the Japanese Agricultural Standards of laminated wood for structural use is that, in the case of cedar wood, the minimum radius of curvature is 5 mm for a thickness of 5 mm (hereinafter, this is Curvature ratio = 1
/ 100 "). Therefore, when a thicker drawing plate is used, the radius of curvature cannot help but be reduced, so that the application as a structural material is limited.
On the contrary, in order to reduce the radius of curvature, it is necessary to reduce the thickness of the sawing plate, and as a result, the above-mentioned price / technical problems will re-emerge.

[0009]

SUMMARY OF THE INVENTION The present invention has been made by the inventors of the present invention in view of the above problems, and uses a relatively thick sawing board suitable for structural laminated wood to prevent damage to the material. An object of the present invention is to provide a method for manufacturing a curved laminated material and a manufacturing apparatus therefor capable of manufacturing a laminated material having a much smaller radius of curvature than ever before with uniform adhesion without inviting.

[0010]

SUMMARY OF THE INVENTION The present invention is a method for manufacturing a curved laminated wood, in which a plurality of laminated plates are laminated and curved to manufacture, and the Young's modulus of bending of the laminated plates is measured by the mechanical grade classification. , The value of which is less than a certain value is selected and arranged so that the bending Young's modulus of the outside drawing plate of the curved shape to be formed is larger than the bending Young's modulus of the inside drawing plate. Then, it is manufactured.

Further, there is provided an apparatus for manufacturing a curved laminated wood, which is manufactured by laminating a plurality of pulling boards and bending the laminated boards, wherein a pedestal having substantially the same shape as the inner shape of the laminated wood, and a plurality of pressing members. It comprises a cylinder and pressure pieces arranged corresponding to the respective pressure cylinders, and the adjacent pressure pieces are rotatably connected to each other at their adjacent portions.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the ratio of the thickness to the radius of curvature is 1/1 using a saw plate having a thickness of 5 mm or more as a material.
It is possible to manufacture a curved laminated material that does not cause the problems and problems of the prior art even if it is formed to have a dramatically small radius of curvature of 00 to 1/60 or more. Its main constitution consists of a method of selecting the quality of the sawing board as a manufacturing material and its arranging method, and a pressing method and a pressurizing device for applying a uniform load to the appropriately placed sawing board. As a result, the load is applied comfortably until the desired bending state is achieved,
Moreover, by maintaining an even load during crimping, a completely bonded state can be achieved. Since the manufactured curved laminated wood has high strength, it can be expected to be applied to various structural materials.

First, regarding the selection of the sawn plate as a material, all the sawn plates to be used are those classified by mechanical grade, and those having a bending Young's modulus of 5000 N / mm ² or less are used. The thickness of the sawing plate is preferably 5 mm or more, and in the case of this bending Young's modulus, the above-mentioned thickness-to-curvature radius ratio is 1/100 to 1/60, or a curve exceeding this is obtained. You can

The wood as the raw material is preferably cedar wood, and the wood having such bending characteristics is used as the raw material. For example, it is said that cedar wood grown in cold regions has a high bending Young's modulus due to its high density, whereas cedar wood grown in warm regions has relatively low bending strength. However, it has been found in recent years that the bending strength of cedar native to the southern Kyushu region, especially the Japanese cedar called Obisugi, is not so low even though the bending Young's modulus is low.

Next, the shingles selected according to the above criteria are further subdivided to determine the arrangement. That is, the pulling plate is arranged so that the Young's modulus of bending gradually decreases from the outside of the curve to the inside of the curve. As a result, the bending stress on the inner side is reduced, and the displacement or unevenness of the adhesive surface is less likely to occur during pressure bonding. The pulling plate arranged with this as a reference is bent and pressure-bonded by the following method.

When bending, the adhesive is applied to the pulling board which has been selected and arranged as described above and laminated, and this is placed on a curved pedestal and pressed outward from the vicinity of the center of the curved portion. While curving, pressurization is continued until it conforms to this pedestal shape.

The pressurizing method is preferably performed by a pressurizing device which will be described later. As a method thereof, there are a plurality of pressurizing pieces arranged continuously so as to cover the entire top surface of the sawing plate. Then, there is a cylinder for applying pressure to each of the press pieces, and the pressurizing method from the cylinder is such that it is perpendicular to the surface of the press piece. As a result, the uneven pressure applied to the laminated material is eliminated, and the entire member is pressure-bonded with a uniform pressure. Further, although pressure is applied to the entire laminated material, unlike the curved formwork as in the prior art, the pressure is applied from individual cylinders, and the shape of the pressing surface changes along the shape of the uppermost pulling plate. Therefore, the load is not concentrated and applied to the maximum curved portion at once.

The pressurizing device of the present invention has, as a main characteristic part, a plurality of pressurizing pieces arranged continuously so as to cover the entire uppermost drawing plate as described above. In the pressure piece, the adjacent pressure pieces are connected by a shaft. Therefore, although the individual pressure pieces are independent, it is possible to apply a uniform pressure to the entire laminated member while maintaining the relative position with the adjacent pressure pieces.

[0019]

EXAMPLES The present invention will be described more specifically by way of examples. FIG. 1 is a flow chart conceptually explaining a manufacturing method and a manufacturing apparatus according to the present invention, and FIG. 2 is a perspective view showing an outline of the manufacturing apparatus of this embodiment. As shown in Figure 1,
The manufacturing method of the present invention comprises the following basic steps. (1) Lumbering process for lumbering and drying the lumber from raw wood (2) Selection process of the obtained lumber according to the mechanical grade classification and selection of placement (3) Application of adhesive to the lumber with placement Laminating step of laminating and laminating (4) Crimping step of curving the laminated drawing plates and applying pressure to form laminated wood

In the lumber production process of this example, cedar grown around Nichinan City, Miyazaki Prefecture (diameter: about 20 cm) was used. After this lumber was lumbered, it was placed in a drying pot and dried to obtain a 6 mm thick sawing board. In order to classify these saw plates into mechanical grades, the Young's modulus of bending was measured and only those having less than 5000 N / mm ² were selected.

Resorcinol resin adhesives or aqueous polymer isocyanate resin adhesives were applied to the surfaces of the finally selected sawn boards, and they were laminated in order from the smallest bending Young's modulus to the bottom.

The molding process is started before the adhesive is cured. Here, the pressurizing device used in the molding step will be described. As shown in FIG. 2A, the pressurizing device 1 of the present embodiment includes a plurality of pressurizing pieces 11 a to 11 n, and adjacent pressurizing pieces are connected by a connecting shaft 12. Therefore, each pressurizing piece 11a-11n is connected to the connecting shaft 12
It is rotatable about the axis.

As shown in FIG. 2 (B), after applying the adhesive, the pulling board 2 laminated on the pedestal 3 is moved by the cylinders (arrows) through the pressing pieces 11a to 11n. Pressure is applied in a direction substantially perpendicular to the curved surface. Therefore, the pressure from the cylinder is equal to the pressure pieces 11a to 11c.
It is made uniform by n and is transmitted to the surface of the pulling plate 2, and pressure is applied to the whole pulling plate.

The pressed and curved pulling board 2 is cured as it is under a pressure for about one day and night, the pressure is released when the adhesive is hardened, and then the finish is applied to be used as a structural material. It

As an example of use as a structural material, for example, by disposing the pillars, bases, and girders in the squares, it is possible to sufficiently withstand the stress in the frame and obtain strength higher than that of the conventional brace structure. . Therefore, since a space can be provided in the frame in which the laminated member is arranged, it is possible to freely arrange the openings, which has been difficult in the past.

[0026]

Since the present invention is constructed as described above, the following effects can be obtained in manufacturing a curved laminated material for structural materials. (1) If an attempt is made to manufacture a curved laminated material having a small radius of curvature, it is possible to reliably manufacture a curved laminated material that has conventionally been liable to be broken, such as cracks. (2) Since a relatively thick pulling plate can be used and the joining is made uniform, the strength is excellent. (3) Since the radius of curvature with respect to the thickness of the saw plate used as a material can be made much smaller than before, it is practical as a manufacturing of a structural material.

[Brief description of drawings]

FIG. 1 is a flow diagram conceptually explaining a manufacturing method and a manufacturing apparatus according to the present invention.

FIG. 2 is a perspective view showing an outline of a manufacturing apparatus of this embodiment.

[Explanation of symbols]

1 .... Pressurizing device 11a-11n ... Pressure piece 12 ... ・ Connecting shaft 2 ... 3 ... pedestal

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yutaka Iimura             Miyazaki Prefecture Miyakonojo City Hanaimachi 21 No. 2 Miyazaki Prefecture Wood             Utilization Technology Center F term (reference) 2B250 AA01 BA04 BA09 CA13 DA01                       EA13 FA21 FA23

Claims (7)

[Claims] 1. A method for manufacturing a curved laminated material, comprising laminating a plurality of pulling plates and bending the laminated pulling plates to measure the Young's modulus of bending of the pulling plates according to the mechanical grade classification, and the value is a constant value or less. The present invention is characterized in that the existing pulling plates are selected, and the bending Young's modulus of the outside pulling plate of the curved shape to be molded is arranged and manufactured so as to be larger than the bending Young's modulus of the inside pulling plate. Method for manufacturing curved laminated lumber. 2. The bending Young's modulus to be selected is 5000 N /
The method for manufacturing a curved laminated lumber according to claim 1, wherein the bending laminated wood has a diameter of ² mm or less. 3. The method for manufacturing a curved laminated lumber according to claim 1, wherein the pulling plate has a thickness of 5 mm or more. 4. The method for manufacturing a curved laminated member according to claim 1, wherein the ratio of the minimum radius of curvature of the laminated member to the thickness of the saw plate is less than 1: 100. 5. In pressurizing laminated laminated boards, pressure pieces are continuously arranged on the topmost laminated board, and each of the pressure pieces is pressed by an individual pressurizing device to be molded. The method for manufacturing a curved laminated material according to claim 1, wherein each of the pressing pieces is displaced and pressed so as to follow the uppermost drawing plate. 6. A curved laminated lumber manufacturing apparatus for laminating a plurality of pulling plates and bending the laminated laminating plates, wherein the pedestal has substantially the same shape as the inner shape of the laminated lumber, and a plurality of pressing members. A curved assembly comprising a cylinder and pressure pieces arranged corresponding to the respective pressure cylinders, and adjacent pressure pieces are rotatably connected to each other at their adjacent portions. Material manufacturing equipment. 7. An apparatus for manufacturing a curved laminated material according to claim 6, wherein the pressing direction by each pressing cylinder is substantially perpendicular to the corresponding pressing surface.