JP2001191420A - Method for preparing joint made of frp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently prepare a joint made of an FRP with a recessed part like a rubber ring mounting channel on the inner periphery by simply and surely winding a continuous fiber on a mandrel with a projected part on the outer periphery. SOLUTION: A process wherein the continuous fiber 11 is wound on the mandrel while the mandrel 14 is rotated and a carriage traverse 13 is moved, a process wherein when the continuous fiber reaches one of the side edges of the projected part 22, rotation of the mandrel is stopped and the carriage traverse is moved, a process wherein by stopping the carriage traverse and rotating the mandrel, a condition where the continuous fiber gets over the projected part is realized and a process wherein the carriage traverse is moved while the mandrel is rotated in such a way that the continuous fiber having gotten over the projected part is wound on the peripheral face on the other side are successively performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an FRP (fiber reinforced plastic) joint, and more particularly, to a method of winding a filament (continuous fiber) when manufacturing an FRP joint by a filament winding method.

[0002]

2. Description of the Related Art FRP
As a method of winding a fiber around a mandrel when producing a pipe made of a resin, for example, as described in Japanese Patent Publication No. 5-54416, the outer surface of a rotating mandrel is coated with continuous fibers impregnated with resin. A filament winding method is known in which a reel is traversed and reciprocated in a direction parallel to the axis of the filament and is wound out.

This method is effective for a straight pipe having no unevenness over its entire length, but cannot be applied to the manufacture of a joint having a rubber ring mounting groove on the inner periphery. That is, the mandrel for molding such a joint forms a portion corresponding to the rubber ring mounting groove,
Since the convex part in the circumferential direction is provided on the outer periphery of the mandrel, simply moving the carriage traverse continuously while rotating the mandrel continuously will result in uneven winding of the continuous fiber at the convex part. As a result, the thickness of the manufactured FRP may become uneven, or the strength of this portion may be reduced. For this reason, the FRP joint having a concave portion such as a rubber ring mounting groove on the inner periphery is actually performed by a hand lay-up method in which a mat-like fiber is attached to the outer periphery of the mandrel.

Accordingly, the present invention is to easily and reliably wind a continuous fiber around a mandrel having a convex portion on the outer periphery, so that an F having a concave portion such as a rubber ring mounting groove on the inner periphery.
It is an object of the present invention to provide a method of manufacturing an FRP joint that can efficiently manufacture an RP joint.

[0005]

In order to achieve the above object, a method of manufacturing an FRP joint according to the present invention is directed to a method of manufacturing a FRP joint having a circumferential concave portion on an inner periphery of a joint body. In a method of manufacturing a FRP joint, in which a continuous fiber impregnated with resin is drawn out and wound from a reciprocating carriage traverse on a surface, a joint body is formed while rotating the mandrel to move the carriage traverse. A step of winding the continuous fiber around one outer peripheral surface of the cylindrical portion of the mandrel, and when the continuous fiber reaches one side edge of the convex portion of the mandrel provided to form the concave portion of the joint, A step of moving the carriage traverse in the direction of the other side edge of the projection while the rotation is stopped; and a step of moving the carriage traverse in the direction of the other side edge of the projection. Rotating the mandrel so that the continuous fiber passes over the convex portion with the thread stopped, and rotating the mandrel to wind the continuous fiber over the convex portion around the other outer peripheral surface of the mandrel while moving the carriage traverse. And moving it.

Further, the present invention provides a step of moving the carriage traverse from one side edge of the projection to the other side edge while the rotation of the mandrel is stopped, and A step of rotating the mandrel so that the continuous fiber passes over the convex portion with the moved carriage traverse stopped, and a step of rotating the carriage traverse while the rotation of the mandrel is stopped while the mandrel is stopped. Moving the mandrel in such a manner that the continuous fiber moves over the convex portion in a state where the carriage traverse moved in the direction of the one lateral edge from the side edge to the one lateral edge is stopped, and And the reverse feed operation consisting of is repeated a plurality of times.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view showing an example of a process procedure in a method of manufacturing an FRP joint according to the present invention. FIGS. 2 and 3 schematically show a filament winding method, and FIG. 2 is a mandrel. FIG. 3 is a schematic view seen from the axial direction, and FIG. 3 is a schematic view seen from the radial direction of the mandrel.

First, as shown in FIGS. 2 and 3, in the filament winding method, continuous fibers 11 drawn from a continuous fiber supply source 10 are introduced into a resin impregnation tank 12 to be impregnated with resin, and then reciprocated. Carriage traverse 13
And wound around the rotating mandrel 14. Carriage traverse 13
Is supported so as to be movable in a direction parallel to the axis of the mandrel 14 along the guide rail 15, and is formed so as to be able to move to a predetermined position at a predetermined speed by driving means having a motor, a screw, and the like. The mandrel 14 is formed so as to be able to rotate at a predetermined speed by a motor connected to a rotating shaft 16 supporting the mandrel 14.

As shown by an imaginary line in FIG. 3, an FRP joint 20 which is an object of the present invention has a concave portion 21 such as a rubber ring mounting groove for mounting a rubber ring for sealing on the inner periphery. And a mandrel 1 for forming the joint.
In FIG. 4, a projection 22 for forming a recess 21 is provided by a split mold at a predetermined position on the outer periphery of a cylindrical portion 23 for forming the inner periphery of the joint body.

Next, a procedure for winding the continuous fiber 11 around the mandrel 14 having the convex portion 22 on the outer periphery will be described with reference to FIG. In FIG. 1, the continuous fiber 11 is represented by one line, but the same applies to a case where a plurality of continuous fibers are simultaneously wound.

First, as shown in FIG. 1A, the continuous fiber 11 is wound around the outer peripheral surface 23a on one side of the cylindrical portion 23 of the mandrel 14 with the convex portion 22 therebetween. . This first step can be performed by moving the carriage traverse 13 in the direction of the convex portion 22 at a predetermined speed while rotating the mandrel 14 at a predetermined speed, as in the related art. Then, when the continuous fiber 11 reaches the one side edge of the convex portion 22 as shown in FIG. 1A, the rotation of the mandrel 14 is stopped and the first step is completed.

In the second step, as shown in FIG.
Carriage traverse 1 with mandrel 14 stopped
3 is a step of moving the projection 3 toward the other side edge of the projection 22. In the second step, the continuous fiber 11 gets over the convex portion 22, and in the next third step, the mandrel 14 is rotated by a predetermined angle while the carriage traverse 13 is stopped at the moved position. As a result, FIG. 1 (C)
As shown in FIG. 1 (D), the continuous fibers 11
And is wound around the other side edge of the convex portion 22.

In the fourth step, the state shown in FIG.
As shown in (E), this is a step of moving the carriage traverse 13 toward the end of the mandrel 14 at a predetermined speed while rotating the mandrel 14 at a predetermined speed. Side outer peripheral surface 2
The continuous fiber 11 is wound around 3b.

When the continuous fiber 11 is wound around the outer peripheral surface 23b on the other side of the mandrel 14, the carriage traverse 13 is moved in the reverse direction while rotating the mandrel 14, and as shown in FIG. The rotation of the mandrel 14 is stopped when the continuous fiber 11 reaches the other side edge of the mandrel 22. In this step, the first step is performed in the reverse direction. Then, as shown in FIG. 1 (G), after moving the carriage traverse 13 in the direction of one side edge of the projection 22, the mandrel 14 is rotated again as shown in FIG. 1 (H). As a result, as shown in FIG.
In a direction opposite to that of the second and third steps, the continuous fiber 11 is over the convex portion 22.

Thereafter, as shown in FIG. 1 (J), a direction opposite to the third step of moving the carriage traverse 13 toward the end of the mandrel 14 at a predetermined speed while rotating the mandrel 14 at a predetermined speed. Is performed. As a result, the continuous fiber 1
1 is doubly wound. By repeating each of the above steps a predetermined number of times, the continuous fiber 11 can be wound around the mandrel 14 in a predetermined state.

Further, a second step of stopping the rotation of the mandrel 14 and moving the carriage traverse 13 from one side edge of the projection 22 to the other side edge, and moving the carriage traverse 13 toward the other side edge of the projection 22 And a third step of rotating the mandrel 14 by stopping the carriage traverse 13 and stopping the rotation of the mandrel 14 when the state shown in FIG. 1D is reached. 1G for moving the ledge traverse 13 in the opposite direction from the other side edge of the protrusion 22 to one side edge, and stopping the carriage traverse 13 moved in the direction of one side edge of the protrusion 22. 1H in which the mandrel 14 is rotated to rotate the mandrel 14, and the reverse feed operation and the forward feed operation are repeated an appropriate number of times. It can be wound around the continuous fibers 11 uniformly to. Further, by rotating the mandrel 14 by a predetermined angle between the forward feed operation and the reverse feed operation, the continuous fiber 11 having once passed over the convex portion 22 may return to the original position when the carriage traverse 13 is moved. Can be reliably prevented.

In FIG. 1, the projections 22 of the continuous fiber 11 are shown.
In order to clarify the state of climbing over, the angle of the continuous fiber 11 over the convex portion 22 is shown to be large, but in the actual process, the size of the mandrel 14 and the convex portion 22, the number of continuous fibers 11, and the number of windings By adjusting the movement amount of the carriage traverse 13 and the rotation angle of the mandrel 14 according to the density or the like, the continuous fiber 11 can be wound around the convex portion 22 in substantially the same state as the cylindrical portion 23. Further, the same process can be performed even when there are two or more convex portions 22.

As described above, by rotating the mandrel 14 and moving the carriage traverse 13 at a predetermined timing, the mandrel 14 having the convex portion 22 on the outer periphery is provided.
Can also apply the same filament winding method as the conventional straight pipe, so that it is possible to efficiently manufacture an FRP joint having a concave portion such as a rubber ring mounting groove on the inner periphery. Becomes

[0019]

As described above, according to the manufacturing method of the FRP joint of the present invention, the continuous fiber to the mandrel for forming the FRP joint having a concave portion such as a rubber ring mounting groove on the inner periphery is formed. Can be performed in the same manner as in the filament winding method, so that the production efficiency can be greatly increased. Further, by repeating the winding of the continuous fiber around the convex portion a plurality of times by reciprocating the carriage traverse, the continuous fiber can be evenly wound around the convex portion.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of a process procedure in a method of manufacturing an FRP joint according to the present invention.

FIG. 2 is a schematic view showing the outline of a filament winding method as viewed from a mandrel axis direction.

FIG. 3 is a schematic diagram similarly viewed from a mandrel radial direction.

[Explanation of symbols]

Reference Signs List 10: continuous fiber supply source, 11: continuous fiber, 12: resin impregnation tank, 13: carriage traverse, 14: mandrel, 15: guide rail, 16: rotating shaft, 20: FRP
Fittings, 21 ... concave, 22 ... convex, 23 ... cylindrical

Claims (2)

[Claims] 1. A resin-impregnated continuous fiber is fed from a reciprocating carriage traverse and wound around a peripheral surface of a mandrel for forming an FRP joint having a circumferential concave portion on an inner periphery of a joint body. In the method for manufacturing an FRP joint, a step of winding the continuous fiber around one outer peripheral surface of a cylindrical portion of a mandrel forming a joint body while rotating the mandrel to move the carriage traverse, The carriage traverse is moved in the direction of the other side edge of the convex portion while the rotation of the mandrel is stopped when it reaches one side edge of the convex portion of the mandrel provided to form the concave portion of the joint. Process and rotating the mandrel so that the continuous fiber passes over the convex part with the carriage traverse moved to the other side edge direction of the convex part stopped. And a step of moving the carriage traverse while rotating the mandrel so as to wind the continuous fiber over the convex portion around the other outer peripheral surface of the mandrel. 2. A step of moving the carriage traverse from one side edge to another side edge of the projection while the rotation of the mandrel is stopped, and a carriage moved in the direction of the other side edge of the projection. Rotating the mandrel so that the continuous fiber passes over the convex portion with the traverse stopped, and moving the carriage traverse from the other side edge of the convex portion with the rotation of the mandrel stopped while rotating the mandrel. Reverse feeding comprising a step of moving the mandrel in the opposite direction to the side edge, and a step of rotating the mandrel so that the continuous fiber passes over the projection while the carriage traverse moved in the direction of one side edge of the projection is stopped. The method according to claim 1, wherein the operation is repeated a plurality of times.