JP2904251B2 - Fiber reinforced resin pipe and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber reinforced resin (hereinafter, referred to as "FRP") pipe used for, for example, a robot arm and a method of manufacturing the same.

[0002]

2. Description of the Related Art Heretofore, this type of FRP pipe has generally been manufactured by a filament winding method. As shown in FIG. 8, the carbon fiber A drawn from the bobbin B is passed through a liquid epoxy resin E stored in a tank T via a roller R, so that the epoxy resin E is applied to the carbon fiber A. After impregnating and subsequently winding and curing around a mold (mandrel) M rotating in the direction of the arrow, the mandrel M is pulled out to produce a fiber reinforced resin pipe P as shown in FIG.

[0003]

In the conventional fiber reinforced resin pipe P, since it is merely formed into a straight tube, it easily buckles when it receives a bending moment or a torsional moment. It is easily crushed by reducing the internal pressure. In order to solve this difficulty, it is conceivable to increase the wall thickness of the pipe P. However, this increases the weight and the manufacturing cost. Also,
When the length of the pipe P is increased, the buckling strength is significantly reduced, so that there is a disadvantage that the length of the pipe P cannot be increased too much.

Further, since the mandrel M needs to be longer than the length of the pipe P, the manufacturing cost is also increased in this respect. SUMMARY OF THE INVENTION In view of the above problems, the present invention is a fiber reinforced resin pipe that is lightweight, has a large buckling strength, can reduce manufacturing cost, and can be freely adjusted in length without using a long mold. And a method for manufacturing the same.

[0005]

In order to achieve the above object, a fiber reinforced resin pipe according to the first aspect of the present invention has a plurality of outer cylinder base skins made of fiber reinforced resin, and the outer cylinder base skins abut each other. An inner cylindrical base skin made of fiber-reinforced resin for forming a long basic skin pipe by concentrically connecting the respective outer cylindrical base skins by being fitted and fixed to the ends , and In the direction perpendicular to the axis
It consists of a resin ring-shaped rib or
And a fiber-reinforced resin outer skin fitted on the outer peripheral surface of the long basic skin pipe.

According to a second aspect of the present invention, there is provided a method of manufacturing a fiber reinforced resin pipe, wherein a fiber reinforced resin sheet is wound around a mold and cured, and then demolded to form a plurality of outer cylinder base skins. After winding and curing the fiber reinforced resin sheet along the inner wall surface, it is removed to form an inner cylindrical base skin, and a direction perpendicular to the axis of the inner skin is formed inside the inner cylindrical base skin.
A reinforcing member made of a resin-made ring-shaped rib or partition wall fitted into the outer cylinder base body is fixed, and a half body of the inner cylindrical base skin with the reinforcing member is fitted and fixed to an end of each outer cylindrical base skin. A plurality of outer tube base skins with a tube base skin are formed, and the respective outer tube base skins with an inner tube base skin are sequentially joined to form a long base skin pipe of a predetermined length, and a fiber is formed on the long base skin pipe. It is characterized in that an outer skin made of a reinforced resin sheet is wound and cured.

[0007]

According to the fiber reinforced resin pipe of the first aspect,
Since a plurality of outer cylinder base skins are manufactured with a short mold and each outer cylinder base skin is added via the inner cylinder base skin, it is easy to manufacture a fiber-reinforced resin pipe of a desired length. And a long mold is not required, and the manufacturing cost can be reduced. In addition, since the outer cylinder foundation skin is reinforced by the reinforcing material via the inner cylinder foundation skin,
Even when a bending moment or a torsional moment is received, buckling hardly occurs, and even if the internal pressure is reduced, there is no possibility of crushing. Furthermore, the weight can be reduced by reducing the thickness.

[0008] According to the method for manufacturing a fiber-reinforced resin pipe according to the second aspect, when forming the inner cylinder base skin,
Since the inner wall surface of the outer cylinder base skin is used and a mold is not required, the manufacturing cost can be further reduced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a fiber-reinforced resin pipe P according to an embodiment of the present invention, in which a plurality of outer cylinder base skins 1a are integrally connected to each other. An inner cylindrical base skin 2 for forming a long basic skin pipe 1, a reinforcing material 3 fixed inside the inner cylindrical base skin 2, and an outer skin 4 fitted to the long basic skin pipe 1
It is composed of

[0010] The outer cylinder base skin 1a is formed by winding a prepreg sheet (fiber reinforced resin sheet) in which carbon fiber is impregnated with an epoxy resin around a mold, curing the prepreg sheet, and then pulling the mold to pull out. Is molded.

The inner cylinder basic skin 2 comprises an outer cylinder basic skin 1a.
Similarly to the above, the prepreg sheet is wound around the inner wall surface of the mold or the outer cylinder foundation skin 1a in place of the mold and cured, and then pulled out from the mold or the outer cylinder foundation skin 1a. One half of the body is fitted into the end of the outer cylindrical base skin 1a and is bonded with an adhesive such as epoxy resin.

The reinforcing member 3 is formed of a ring-shaped rib or a partition formed by curing a prepreg sheet, and is provided in the inner cylindrical base skin 2 in a direction perpendicular to the axial direction of the inner cylindrical base skin 2. While being arranged, the outer peripheral portion is adhered to the inner wall surface of the inner cylindrical base skin 2 by an overlay 5 made of an adhesive or a molten FRP. In addition,
A through hole 6 is formed at the center of the reinforcing member 3.

The outer skin 4 is made of a prepreg sheet, and is formed by winding a predetermined thickness on the surface of the long basic skin pipe 1 and hardening it. Based on the above configuration,
A method of manufacturing the fiber reinforced resin pipe P will be described. As shown in FIG. 3, after a prepreg sheet is wound around a mold M and cured, the mold M is pulled out and the outer cylinder base skin 1a is formed. The outer tube base skin 1a has such strength that it can stand on its own. Next, as shown in FIG. 4, a prepreg sheet is adhered along the inner wall surface at the end of the outer cylinder base skin 1a, and is hardened in a tubular shape. I do. In addition, in order to make it easy to remove the inner cylinder foundation skin 2, the outer cylinder foundation skin 1
a release film 8 is interposed between the release film 8 and the film a. in this case,
Since the outer cylinder base skin 1a is used instead of the mold, the inner cylinder foundation skin 2 can be formed with high accuracy, and the production cost can be reduced by the amount that the mold is unnecessary. Subsequently, as shown in FIG. 5, the reinforcing member 3 is disposed in the inner cylindrical base skin 2 in a direction orthogonal to the axial direction of the inner cylindrical base skin 2, and the outer peripheral portion is bonded with an adhesive or an overlay. 5 adheres to the inner wall surface of the inner cylinder foundation skin 2. As a result, the inner cylindrical foundation skin 2 can have a rigid structure. After that, as shown in FIG. 6, one half of the inner cylinder basic skin 2 with the reinforcing material 3 is inserted into one end of the outer cylinder basic skin 1a and adhered with an adhesive 9, and the outer cylinder with the inner cylinder basic skin 2 is attached. A large number of tube base skins 1a are manufactured.

Next, as shown in FIG. 7, the other half of the inner cylindrical base skin 2 protruding outward from one end of the outer cylindrical base skin 1a is placed in the other end of the adjacent outer cylindrical base skin 1a. To form a long basic skin pipe 1 having a predetermined length. Subsequently, as shown in FIG. 2, an outer skin 4 made of a prepreg sheet is wound around a surface of the long basic skin pipe 1 to a predetermined thickness and cured, so that a desired fiber-reinforced resin pipe P as shown in FIG. Can be obtained.

In the above embodiment, the case where the fiber-reinforced resin pipe P having a rectangular cylindrical shape is manufactured has been described as an example. In addition, for example, a fiber-reinforced resin pipe P having a polygonal shape such as a circle or a pentagon or more is manufactured. You can also.

[0016]

According to the first aspect of the present invention, a plurality of outer cylinder base skins are manufactured using a short mold, and each of the outer cylinder base skins is added. Fiber reinforced resin pipes can be easily manufactured,
A long mold is not required, and the manufacturing cost can be reduced. In addition, since the outer cylinder base skin is reinforced by the reinforcing material, it does not easily buckle even when subjected to a bending moment or a torsional moment, and there is no danger of being crushed even when the internal pressure is reduced. Furthermore, the weight can be reduced by reducing the thickness.

According to the second aspect of the present invention, the same effect as that of the first aspect can be obtained. In particular, when forming the inner cylindrical base skin, the outer cylindrical base skin is replaced with a mold. Since the inner skin can be formed with high precision, and a mold is not required, the manufacturing cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a fiber reinforced resin pipe according to one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the same.

FIG. 3 is a perspective view showing a molding state of the outer cylindrical base skin.

FIG. 4 is a longitudinal sectional view showing a molded state of the inner cylindrical base skin.

FIG. 5 is a perspective view showing a state in which the reinforcing material is adhered to an inner cylinder base skin.

FIG. 6 is a longitudinal sectional view showing a state in which the inner cylindrical base skin with the reinforcing material is fitted and fixed to one end of the outer cylindrical base skin.

FIG. 7 is a longitudinal sectional view showing a state where the long basic skin pipe is molded.

FIG. 8 is a schematic explanatory view showing a conventional method for producing a fiber-reinforced resin pipe.

FIG. 9 is a longitudinal sectional view of a conventional fiber reinforced resin pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Long base skin pipe 1a Outer tube base skin 2 Inner tube base skin 3 Reinforcement 4 Outer skin P Fiber reinforced resin pipe

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-105927 (JP, A) JP-A-63-192020 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B29D 23/00 B32B 1/08 F16L 11/10 B29C 70/16

Claims (2)

(57) [Claims] 1. A plurality of outer cylinder base skins made of fiber reinforced resin, and the outer cylinder base skins are coaxially and integrally connected by being fitted to and fixed to ends of the outer cylinder base skins that abut each other. and the fiber-reinforced resin inner cylinder basis skin forming the elongated basal skin pipe and, on the inner cylinder basis in skin
Resin phosphorus fitted and fixed in a direction perpendicular to its axis
A fiber-reinforced resin pipe comprising: a reinforcing member formed of a rib-like rib or a partition; and a fiber-reinforced resin outer skin fitted on an outer peripheral surface of the long basic skin pipe. 2. After winding and curing a fiber reinforced resin sheet around a mold, the mold is released to form a plurality of outer cylinder base skins.
After winding and curing the fiber reinforced resin sheet along the inner wall surface of the outer cylinder base skin, the fiber is reinforced and removed to form an inner cylinder foundation skin, and the interior of the inner cylinder foundation skin is orthogonal to its axis.
From a resin ring-shaped rib or partition inserted in the direction
And a half body of the inner cylinder basic skin with the reinforcing material is fitted and fixed to the end of each outer cylinder basic skin, and a plurality of outer cylinder basic skins with the inner cylinder basic skin are formed. A fiber characterized in that a long basic skin pipe having a predetermined length is formed by sequentially joining outer skin basic skins with basic skins, and an outer skin made of a fiber reinforced resin sheet is wound around the long basic skin pipe and cured. Manufacturing method of reinforced resin pipe.