JPH05286077A - Manufacture of composite meterial - Google Patents

Abstract

PURPOSE:To improve productivity, and to provide the manufacture of a composite material capable of preventing the damage of materials at the time of manufacture. CONSTITUTION:In the manufacture of a composite material for construction, in which a woody material 3 bonded with a part of the surface of a steel material 2, the surface of the woody material 3 or the surface of the steel material 2 is coated with adhesives, the woody material 3 is stuck onto the surface of the steel material 2, and the steel material 2 is heated while the woody material 3 is pushed against the surface of the steel material 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a composite material in which a wood material is adhered to at least a part of the surface of a steel material, and particularly to the production of a composite material used for structural members for construction such as beams and columns. Regarding the method.

[0002]

2. Description of the Related Art Generally, wood is widely used as a structural material for construction such as pillars and beams as a construction material because it is easily available at low cost, can be easily processed, and has a good texture. However, in recent years, it has become difficult to obtain a suitable material due to depletion of wood resources, and it has become difficult to use the wood due to the price increase of wood. Further, since wood is largely bent by load, warped due to drying and shrinkage, when used as a beam for construction, there is a problem in that a sliding door or the like cannot be opened and closed smoothly due to the warp or warp in a sill or a sill. For this reason, in recent years, composite materials using steel materials have been used as core materials. This composite material is made by adhering wood to part or all of the surface of an H-section steel, L-section steel, steel pipe, etc., has little deflection under load, and can prevent warpage due to drying, and is therefore widely used in recent years. At the same time, various technologies related to the composite material and the manufacturing method thereof have been proposed.

For example, Japanese Patent Laid-Open No. 63-128931 (Japanese Patent Application No. 61-274934) discloses a flexible molding cylinder having a pressurizing chamber in which a plate material is temporarily mounted on the surface of a steel material as a central material. A method is disclosed in which a steel material is inserted into the inside and pressed from the inside toward the outside, and at the same time, a plate material is pressed from the outside toward the inside to be bonded. In addition, JP-A-6
Japanese Unexamined Patent Publication No. 3-280630 (Japanese Patent Application No. 62-115335) discloses a device in which the surface of a steel material is subjected to a blasting treatment and a chemical conversion treatment to improve the adhesion to wood.

[0004]

However, in any of the above-mentioned conventional methods, a long pressing time is required for the adhesive force to be exhibited, so that the productivity is low. there were. Further, since adhesion failure is likely to occur, a large pressure, for example, about 50 Kg / cm ^{2 is} required to press the steel material and the plate material, and there is a risk of causing the plate material to break.

Therefore, it is an object of the present invention to provide a method for manufacturing a composite material, which can improve productivity and prevent damage to the material during manufacturing.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a method for manufacturing a composite material for construction in which at least a part of the surface of a steel material is adhered with a wood material, in which the adhesive is applied to the surface of the wood material or the surface of the steel material. After applying, the wood material is adhered to the surface of the steel material, and subsequently, the wood material is heated while pressing the wood material against the surface of the steel material. The above object has been achieved by providing the information.

[0007]

According to the present invention, after the adhesive is applied to the surface of the steel material or the surface of the wood material, after the wood material is attached to the surface of the steel material,
Simultaneously heat while pressing. By simultaneously applying pressure (clamping) and heating in this way, the adhesive can be developed in a short time, and the wood material can be reliably bonded to the surface of the steel material in a short time.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in FIGS. In each of the drawings, FIG. 1 is a view showing a manufacturing process of the composite material of the present invention, FIG. 2 is a perspective view showing a pressed state of a steel material and a wood material, and FIG. 3 is a view showing a time of adhering the steel material and the wood material. 4 is a perspective view showing a heating state, FIG. 4 is a perspective view of a composite material manufactured according to the present invention, FIG. 5 is a front view showing a method of tightening pressure according to a second embodiment of the present invention, and FIG. 6 is a second view of the present invention. 7 is a front view showing a heating method according to an embodiment of the present invention, FIG. 7 is a perspective view showing a heating method according to a third embodiment of the present invention, and FIG. 8 is a front view showing a pressing method according to a fourth embodiment of the present invention. is there.

The method for producing a composite material of the present invention is a method for producing a composite material for construction in which a wood material is adhered to at least a part of the surface of a steel material, wherein an adhesive is applied to the surface of the wood material or the surface of the steel material. After applying, the wood material is attached to the surface of the steel material, and then the steel material is heated while pressing the wood material against the surface of the steel material.

The steel material 2 used in this embodiment is I
A steel material such as a die, an L-shape, a T-shape, an H-shape, a square tube, or a metal material such as aluminum is used. The shape of the steel material is selected according to the required MOE (Young's modulus of bending). In the first embodiment, a square steel pipe is used as the steel material 2. The wood material 3 to be adhered to the surface is wood, persimmon wood, plywood, MD
F (medium fiber board), FB (fiber board), PB (particle board) and the like are used.

The dimensions of the steel material 2 and the wood material 3 are determined as follows. When the composite material 1 is used as a beam material, there are no particular restrictions on the dimensions, but generally, the composite material 1 as a whole has a width W _b (see FIG. 4) of 105 to 120 mm and a height H _b of 150 to 360 mm. Length L _b is 1800-54
When manufacturing 00 mm, the required bending composition is E,
Assuming that the bending rigidity of the wood material is Ew, the second moment of area I of the composite is the whole, the bending rigidity of the steel material is Es, and the second moment of area is Iw, the second moment Is of the steel section is derived by the following equation (1). Get burned.

[0012]

[Equation 1] Is = (EI / 0.85-EwIw) / ES (1) Then, if Is is determined, the outer peripheral size of the steel material is determined by the cross section of the composite material and the wooden board used, and thus the thickness of the steel material. the S _m is obtained. Therefore, the MOE (Young's modulus of bending) of wood is 10
0 × 10 ³ Kg / cm ² , required MOE 151 × 1
Assuming 0 ³ Kg / cm ² , as shown in FIG. 4, the thickness S _{m of the} steel material is 3 mm, the width W _m is 55, and the height H _m is 190 mm.

The wood material adhered to the surface of the steel material may cover the entire outer peripheral surface as shown in the first embodiment, or may cover one surface of the outer peripheral surface. Is also good. The steel material may be untreated on the surface, but in order to improve durability, ZS (projection of zinc, iron-based, zinc-based alloy particles on the surface) described in JP-A-63-280630 is used.
It is preferable to perform chemical conversion treatment such as. As the adhesive material, a thermosetting adhesive material, preferably an aqueous polymer isocyanate adhesive, a structural epoxy resin, or the like is used.

Next, the clamping device 4 will be described with reference to FIGS. As shown in FIG. 2, the clamping device 4 presses the peripheral surface of the composite material 1 from four directions, and includes a first press plate 6 that presses against the mounting table 5 and a pair that presses the composite material 1 from the side. Second press plates 7a and 7b are arranged, and pumps P are connected to the first press plate 6 and the second press plate 7a, respectively, so that the composite material 1 is pressed by a predetermined pressure. ing. The pressing device 4 holds a plurality of composite materials 1 at the same time between the second press plates 7a and 7b, but in the present embodiment, four composite materials 1 are arranged in a line. The clamping device 4 can freely set the clamping pressure by adjusting the pump P, and presses the composite material from all sides with a desired pressure.

On the other hand, a heater hose 8 through which hot air or steam is blown is arranged on the end side in the longitudinal direction of the composite material 1 and is connected to the open end portion of each composite material 1. As shown in FIG. 3, the heater hose 8 has its other end connected to a heat duct 9, and hot air heated to a predetermined temperature by a built-in heater and an air blower passes through the heater hose 8 so that the steel material 2 is heated. It is designed to be blown inside.

Next, a method of manufacturing the composite material of this embodiment will be described with reference to FIG. The steel material 2 is carried on the carrying line after the surface treatment, but as shown in FIG. 1A, it is preferable that the steel material 2 is preheated during the carrying. By preheating in this way, it is possible to effectively heat the steel material 2 later. On the other hand, wood material 3
As shown in FIG. 1B, an adhesive is applied to one surface of the sheet by a roll coater or the like. Then, the wood material 3 coated with the adhesive is sequentially adhered to the outer surface of the steel material 2. In this embodiment, the four wood materials 3 are attached at four places so as to cover the entire peripheral surface of the steel material 2. When the wood material 3 is attached to the peripheral surface of the steel material 2, the wood material 3 is conveyed to the clamping device 4 by the belt conveyor 12 as shown in (c) of FIG. 1, and as shown in (d) of FIG. The clamping devices 4 are sequentially arranged on the mounting table 5 side by side.

In the pressing device 4, as shown in FIG.
The press plate 6 and one of the second press plates 8 have a predetermined pressure,
To press over the ~20Kg / cm ^2. At the same time, the hose openings 8a of the heater hose 8 are respectively inserted into the open ends of the composite material, and the temperature is 40 ° C or higher, preferably 60 to 60 ° C, from the heat duct.
The steel material 2 is heated by blowing steam (hot air) heated to 100 ° at a wind pressure of ² to 3 kg / cm ² . After heating, the heating is completed in about 15 minutes, the pressing of the pressing device 4 is released, and the composite material 1 is obtained. According to the present embodiment, by heating the steel material 2, the adhesive effect of the adhesive can be accelerated, the composite material can be efficiently manufactured, and the pressing pressure can be reduced, so that the damage of the composite material can be prevented. ..

[Test Example] Next, a test example of the above-described first embodiment will be described together with a comparative example. (Invention) A composite material produced under the following conditions was used as an invention product. Steel material: width W _m 20, height H _m 30 mm, length L 1000 _m
m, thickness S _m 3 mm. Wood: cypress non-defect material or control cypress assembly. Width Wb 45 mm, length L 1000 mm, thickness S _a 35 mm. Adhesive: Water-based polymer isocyanate type (Koyo KR780
0) Resorcinol (Dianol 35) was used in the case of the coating amount of 250 to 300 g / m ² control cypress assembly. Clamping pressure: 15 Kg / cm ² . Hot air temperature: 80 to 100 ° C.

Comparative Example In the above-mentioned test example of the present invention,
Comparative product 1 was pressed at room temperature for 15 minutes, comparative product 2 was pressed at room temperature for 4 hours, and comparative product 3 was prepared by using a cypress assembly as a wood material and at room temperature for 20 hours. did. An adhesive performance test and a bending performance test were performed on the composite materials obtained in each of the present invention and the comparative example. The results are shown in Table 1 below. Since the results of the cypress-free defect and the control cypress assembly were the same, only the values of the cypress-free defect are shown in Table 1 below.

[0020]

[Table 1] In the table, ◯ indicates that the peeling rate of the adhesive layer is 10% or less. X indicates that the peeling rate of the adhesive layer is larger than 10%. The adhesive layer peeling ratio was obtained by immersing the product of the present invention and the comparative product in boiling water for 5 hours and then in room temperature water for 1 hour.
It is a result of performing a peel test after drying at 60 degrees for 24 hours. Each theoretical MOE (Young's modulus of bending) of the product of the present invention and the comparative product was 200 to 210 × 10 ³ Kg / cm ² .

As is clear from Table 1 above, in the case of the comparison product,
In case of bonding, it takes more than 4 hours for bonding, but hot air is blown
The composite material according to the invention heated by heating has a short adhesion time of 15 minutes.
It was possible to reliably bond the wood board to the steel material in time. Servant
Therefore, according to the present invention, the bonding time is longer than that of the conventional method.
Can be shortened and the production rate can be improved. In addition,
The rigidity of the mixture was 85% of the theoretical value. Therefore, chemical conversion
The rigidity is estimated by determining the steel material size
Can be set. Especially, the width of the cross section is 105mm and the height is 2
In the case of 40 mm beam material, the steel material size after chemical conversion treatment has a thickness of 2
mm, 50% or more of the composite cross section, the MOE is
150 x 10 ³Kg / cm²It is estimated to be.

Therefore, if the steel pipe cross-sectional area in the case of using a steel pipe as a steel material with a thickness of 2 mm is 50% or more of the cross-sectional area of the entire composite material, the MOR of the composite material 1 is easily obtained. be able to. Next, another embodiment of the present invention will be described in detail with reference to FIGS. The same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The manufacturing method of the composite material of the second embodiment is shown in FIG.
And as shown in FIG. 6, the first method for heating the steel material 2 is
Instead of the method using hot air used in the above example, the steel material is heated by a method using high frequency induction heating. That is, in the second embodiment, the wooden boards 3 to which the adhesive is attached are arranged around the steel material 2, and the plastic bands 14 made of polypropylene, nylon or the like are stretched, and the wooden boards 3 are pressed onto the steel material 2. The steel material is tightened and passed through the induction heating coil device 15 to heat the steel material by electromagnetic induction to manufacture the composite material 1. The induction heating in this case is performed at an output of 10 to 50 Kw and a frequency of 200 KHz, for example. According to this second embodiment,
Since the steel material can be efficiently heated, the heating time can be further shortened and the productivity can be further improved. Further, since a large device such as a clamping device is not required, the device can be simplified. The induction heating coil device 15 may be provided longer than the length of the composite material so as to cover the entire composite material.

The manufacturing method of the composite material of the third embodiment is the seventh embodiment.
As shown in the figure, the method for heating the steel material 2 is changed to the method using hot air used in the first embodiment, and the heating member 16 is heated by passing it through a hollow steel pipe. The third embodiment is effective when the length of the composite material is short.

The method of manufacturing the composite material of the fourth embodiment is shown in FIG.
As shown in FIG. 3, a placing material 17 having a triangular cross section is used as a placing table of the pressing device 4, and each side 17a of the triangle is formed.
Four composite materials can be arranged side by side on the surface corresponding to and pressed. With this clamping device, 4
By arranging them individually, a total of 16 composite materials can be clamped, so that more efficient production of composite materials can be achieved.

The present invention is not limited to the above-described embodiment, and various modifications such as the material and size of the steel material and the wooden board can be made. For example, if you increase the thickness of the wood board,
For example, if it is 20 mm or more, bending due to heat becomes strong, and heat resistance can be imparted to the composite material.

[0027]

According to the method for producing a composite material of the present invention, the productivity can be improved and the material can be prevented from being damaged during the production.

[Brief description of drawings]

FIG. 1 is a diagram showing a manufacturing process of a composite material of the present invention.

FIG. 2 is a perspective view showing a pressed state of a steel material and a wood material.

FIG. 3 is a perspective view showing a heating state at the time of adhering a steel material and a wood material.

FIG. 4 is a perspective view of a composite material produced according to the present invention.

FIG. 5 is a front view showing a pressing method according to a second embodiment of the present invention.

FIG. 6 is a front view showing a heating method according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing a heating method according to a third embodiment of the present invention.

FIG. 8 is a front view showing a pressing method according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1 Composite Material 2 Steel Material 3 Wood Material 4 Clamping Device 8 Heater Hose

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiro Arai 1-21 Fuso-cho, Amagasaki-shi, Hyogo Sumikin Steel Works Co., Ltd.

Claims (4)

[Claims] 1. A method of manufacturing a composite material for construction in which a wood material is adhered to at least a part of the surface of a steel material, the method comprising: applying an adhesive to the surface of the wood material or the surface of the steel material; A method for producing a composite material, comprising: sticking the wood material to a surface, and then heating the steel material while pressing the wood material against the surface of the steel material. 2. The heating of the steel material is performed by blowing hot air or heated steam to the steel material.
A method for manufacturing the composite material according to 1. 3. The method for producing a composite material according to claim 1, wherein the heating of the steel material is performed by high frequency induction heating. 4. The production of a composite material according to claim 1, wherein the steel material is a steel pipe having a thickness of 2 mm or more, and the cross-sectional area of the steel pipe is 50% or more of the cross-sectional area of the entire composite material. Method.