JPS62132616A - Loading method of reinforcing material in centrifugal molding - Google Patents

Abstract

PURPOSE:To mold a pipe of favorable quality by enabling uniform control in loading of a woven-fabric-like reinforcing material over the whole width, by so constituting the titled method that an idly revolving roll is held in a state capable of performing a planetary revolution along the external circumference of a core material round which a reinforcing material is wound and the reinforcing material is rewound and drawn out by centrifugal force. CONSTITUTION:The titled method is so constituted that an idly revolving roll 2 is arranged in parallel with the external circumference of a reinforcing material core 1, the idly revolving roll 2 is held in a state capable of performing a planetary revolution along the external circumference of the reinforcing material core 1, for example, by an arm 3 and a reinforcing material 1A to be rewound and drawn out by centrifugal force is drawn out through the idly revolving roll 2. At the initial stage wherein the reinforcing material core 1 and a cylindri cal mold 4 are rotated synchronously, the idly revolving roll 2 is fixed to the reinforcing material core 1, simultaneously with release of the reinforcing material 1A the idly revolving roll 2 is released and drawing-out of the reinforcing material 1A is followed by the planetary revolution. With this construction, the transposition under a uniform state is enabled irrespec tive of the size of a width of a woven-fabric-like reinforcing material and formation of a pipe of favorable quality, which is not disorderls in arrangement, or forming of an inner lining surface is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reinforcing material injection method in centrifugal molding, and more particularly to an improvement in reinforcing material injection means in centrifugal molding.

[Conventional technology]

As a means of manufacturing fiber-reinforced plastic tubes or inner-lined tubes, a core body with reinforcing material, etc. wound around it is placed coaxially within a cylindrical mold, and the reinforcing material is produced by using the centrifugal force that acts when both are rotated. A centrifugal molding method is well known in which the dislocation layer is layered on the inner surface of a cylindrical mold.

As this centrifugal molding method, for example,
As seen in Japanese Patent Publication No. 81, etc., a means of using resin-impregnated fibers as a reinforcing material is known, and as seen in Japanese Patent Publication No. 56-42455, a means of using a wide tape body as a reinforcing material is known.

When the latter wide tape body is used as a reinforcing material, it can be said that it is superior to the former in terms of shortening processing time because layering can be done over a wide area along the axial direction at once.

[Problems with conventional technology]

However, when the reinforcing material is a wide tape body, as the width increases, variations tend to occur in the release and delivery speed distribution of the wide tape along the axial direction, resulting in disordered reinforcement. There is a problem that good quality cannot be obtained.

[Problems with conventional technology]

In view of the above-mentioned problems, this invention, when performing centrifugal molding with a wide woven reinforcing material, allows the injection of the woven reinforcing material to be uniformly adjusted over the entire width, thereby forming pipes, etc. of good quality. The purpose of this study was to provide a method for introducing reinforcing materials in centrifugal molding.

[Technology to solve problems]

That is, the reinforcing material injection method in centrifugal molding of the present invention places a reinforcing material-wound core coaxially in a cylindrical mold, and when both are rotated, the centrifugal force acting on the reinforcing material is utilized. In the centrifugal molding method in which reinforcing material is disposed and laminated on the inner surface of the cylindrical mold, idle rolls are arranged parallel to the outer periphery of the reinforcing material-wound core, and the reversing rolls are disposed parallel to the outer periphery of the reinforcing material-wound core. The reinforcing material is supported for planetary rotation by centrifugal force and is fed out via the reversing roll.

[Effect]

In the centrifugal forming method, when releasing a wide woven fabric from the winding core, the starting edge of the opening may wave toward the center due to variations in the mass of the woven fabric per unit and wind pressure at the beginning of rotation. Furthermore, even after the starting end of the release reaches the inner surface of the cylindrical mold, the woven fabric portion undergoing dislocation may undergo undulating deformation in the width direction.

Therefore, as shown in FIG. 1 (1) (21), an idler roll 2 is arranged parallel to the outer periphery of the reinforcing material core 1, and this idler roll 2 is placed along the outer periphery of the reinforcing material core 1. The reinforcing material IA is supported in a planetary manner by, for example, an arm 3, and is rewound and reeled out by centrifugal force, and is fed out via a reversing roll 2. Note that this reversing roll 2
is fixed to the reinforcing material core 1 in the initial stage of synchronous rotation of the reinforcing material core 1 and the cylindrical mold 4 as shown in FIG. The idle roll 2 is also released, and as shown in FIG. 1 (b), the reinforcing material IA
As it is fed out, the planet rotates. At this time, the contact with the reinforcing material IA achieves synchronization in the axial direction of the feeding. In addition, in Fig. 1 (a), l indicates the length of reinforcement +A' LA hanging from the winding core,
This is designed to synchronize the rotation of the reinforcing material IA in the axial direction and eliminate disorder in the reinforcement arrangement. Further, 4 in the figure indicates a cylindrical mold.

In addition, at the initial stage of feeding, the central part of the idler roll 2 is bent and deformed due to centrifugal force as shown in FIG. 2, which may cause a contracted part P to be generated in the central part of the reinforcing material IA.

In order to prevent this, in the case of the heavy reinforcing material IA, the starting end IB of the reinforcing material IA may be cut out in a triangular shape, as shown in FIG. 3, so that the load distribution in the axial direction can be adjusted.

〔Example〕

Next, embodiments of the invention will be described.

185mm diameter on a winding core with a length of 2000vx
0 vx resin-impregnated glass fiber woven fabric is wound 3.2 m,
This was placed coaxially in a cylindrical mold with an inner diameter of 534 mm,
Furthermore, an idling roll is supported on the outer periphery of the winding core so that it can rotate planetarily, and the cylindrical mold, the winding core, and the idling roll are simultaneously rotated in the initial stage, and when the rotation speed reaches 180°/sec, the reversing roll is rotated. At the same time as the reinforcing material was released, the winding core was stopped and the reinforcing material was released.

The woven reinforcing material was guided by reversing rolls that rotated planetarily, synchronized in the width direction, and smoothly disposed and adhered to the inner surface of the cylindrical mold.

In addition, when the above operation was repeated 11 times, uniform feeding was performed in each case, and a reinforcing pipe of good quality without disordered reinforcement was formed.

〔effect〕

Since the present invention is constructed as described above, it is possible to achieve uniform dislocation regardless of the width of the woven reinforcing material, and to achieve a good quality pipe or inner lining surface without any disturbance in reinforcement arrangement. can be formed.

In addition, even when carrying out the present invention, it is easy to carry out the invention since it is only necessary to add an idler roll to a conventionally used centrifugal forming apparatus, and it has various effects such as being easy to implement.

[Brief explanation of drawings]

Figures 1 (a) and (b) are explanatory diagrams of the process of this invention,
FIGS. 2 and 3 are explanatory perspective views of other embodiments.

Claims (1)

[Claims] (1) A reinforcing material-wound core is placed coaxially within a cylindrical mold,
In a centrifugal molding method in which the reinforcing material is disposed and laminated on the inner surface of the cylindrical mold using the centrifugal force that acts on the reinforcing material when both are rotated, an idler roll is parallel to the outer periphery of the reinforcing material-wound core. and the idler roll is supported for planetary rotation along the outer periphery of the reinforcing material winding core body, so that the reinforcing material that is unwound and unreeled by centrifugal force is delivered through the idler roll. A reinforcing material injection method in centrifugal molding characterized by: