JPH08187797A - Method and apparatus for producing cylindrical fiber reinforced plastic - Google Patents

Abstract

PURPOSE: To efficiently produce lightweight cylindrical fiber reinforced plastic having desired length and physical characteristics. CONSTITUTION: Yarns F impregnated with a synthetic resin are guided to the surface of a mandrel M from the respective bobbins B1 of a twist wheel through a guide 2 and a gear 1 is rotated along with the movement of the mandrel M to wind the yarns F around the surface of the mandrel M to form one layer or a plurality of layers. According to circumstances, a heat-shrinkable tape T is further wound around the mandrel M and the wound layer is cut into predetermined length to be molded and the mandrel M is pulled out of a reinforced matrix material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a tubular fiber reinforced plastic used for golf club shafts, fishing rods and the like.

[0002]

2. Description of the Related Art In order to form a reinforcing base material of a tubular fiber reinforced plastic, it is desired to simply wind a yarn without using a braiding machine. However, an existing yarn winding device is shown in FIG.
A filament winder in which a thread F is traversed and wound around a rotating tubular body 13 is known.

[0003]

The reinforcing base material formed by the filament winder has not only a limited length, but also the winding angle of each layer can be freely changed to obtain desired strength, rigidity and flexibility. Is difficult to obtain, and productivity is poor.

An object of the present invention is to efficiently manufacture a tubular fiber reinforced plastic which is lightweight and has desired length and physical properties.

[0005]

In order to achieve the above object, a method of manufacturing a tubular fiber reinforced plastic according to the present invention is directed to a plurality of yarn bobbins on a side surface of a rotary gear having a mandrel passing hole at a central portion thereof. Is rotatably supported, and by a twist wheel in which a yarn guide is arranged around the hole, a yarn impregnated with a synthetic resin in any step before molding is wound around a mandrel to form a reinforcing base material, The mandrel is extracted from the reinforcing base material by molding the reinforcing base material, and a step of winding a heat-shrinkable tape between the yarn winding step and the forming step can be added. The manufacturing equipment is
A plurality of yarn bobbins are rotatably supported on the side surface of a rotary gear having a mandrel passage hole in the center thereof, and a twist wheel having yarn guides arranged around the hole, and a mandrel downstream of the twist wheel. It is composed of a cutter arranged so as to be able to come into contact with and separate from it, and a molding device.

[0006]

In the invention configured as described above, the yarn impregnated with the synthetic resin in any step before molding is guided from the respective bobbins of the twist foil to the mandrel surface through the guides, and the mandrel moves as the mandrel moves. As the gear rotates, one or more layers are wound around the mandrel surface. In some cases, a further heat-shrinkable tape is wrapped. Next, a reinforcing base material having a predetermined length is cut by a cutter and molded. At this time, the tape prevents the thermosetting synthetic resin from flowing out. Finally, the mandrel is extracted from the reinforcing base material to obtain a hollow fiber reinforced plastic.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method and an apparatus for manufacturing a tubular fiber reinforced plastic according to the present invention will be described with reference to FIGS. It should be noted that FIGS. 1 to 4 omit the frame and the like and show only a main part.

The tubular fiber reinforced plastic according to the present invention is generally manufactured as follows.

First, a mandrel M in the form of a rod is formed by a thread (prepreg yarn) F made of carbon fiber, glass fiber, aramid fiber or the like which is previously impregnated with a thermosetting synthetic resin.
Wrap one layer or several layers on the surface of. The thermosetting synthetic resin may be impregnated in any step before molding described later.

Further, the outermost layer is covered with a heat-shrinkable tape T to form a reinforcing base material. This heat shrinkable tape T
Is used to prevent the thermosetting synthetic resin impregnated in the yarn from being washed away during the molding in the next step. In addition,
Even if this step is omitted, the tubular fiber reinforced plastic can be manufactured for the time being.

Next, after cutting to a required length, the reinforcing base material is put into an oven together with a mandrel to perform molding. It is also possible to carry out the well-known autoclave molding by putting it in a pressure vessel and raising the temperature and internal pressure.

Finally, the mandrel is pulled out after taking out the reinforcing base material from the molding container.

The fiber reinforced plastic thus produced has a cylindrical shape with hollow holes after the mandrel M is removed, as shown in FIG.

The mandrel M is a rod-shaped body made of a heat-resistant material, and may have a uniform thickness, may be smoothly changed partially, or may be tapered. Then, a mold release material is applied to the surface so that it can be easily extracted from the reinforcing base material after molding.

The winding of the yarn F around the mandrel M is shown in FIG.
And the twist foil shown in FIG.

The twist wheel comprises a large gear 1 and a guide 2.

The large gear 1 is rotatably supported by a driving gear 4 driven by a motor 3 and a plurality of driven gears 5 from the surroundings, and is usually arranged vertically.
A plurality of bobbins B are rotatably supported on one surface of the bobbin B.
A hole 1 large enough for the mandrel M to pass through in the center
a is formed.

The guide 2 is a cylindrical body that surrounds the hole 1a at the center of the gear, and the guides 2 are equal to the number of bobbins B at the position corresponding to the longitudinal intermediate position of the bobbin B supported by the gear 1. A number of guide holes 2a are formed.

The twist foil thus constructed is
The guide hole 2 for the thread F drawn from each bobbin
a to the surface of the mandrel M, and the mandrel M
By rotating the large gear 1 in either direction while moving in the length direction, the yarn F can be wound around the surface of the mandrel M by one layer by itself.

However, usually, the reinforcing base material needs several layers, and when manufacturing such a reinforcing base material, as shown in FIG. 3, a plurality of large gears 1 (three in FIG. 3) are used. It is necessary to use twisted foils that are placed one on top of the other with a predetermined spacing. The structure of each large gear 1 is basically the same as that shown in FIGS.

In the twist wheel constructed as described above, the large gears 1 at the center are stopped and the rotation directions of the large gears 1 on both sides thereof are reversed, and the rotation direction and speed of each large gear 1 are reversed. Can be changed in various ways. Moreover, the change can be performed in the lengthwise direction of the mandrel M (this point is the same in the cases shown in FIGS. 1 and 2).

By incorporating such various changes in the direction of rotation and speed, it is possible to obtain an object having optimum physical properties such as strength and flexibility. For example, it is possible to continuously manufacture a hand portion requiring rigidity such as a fishing rod and a portion requiring flexibility. The yarn F drawn from each bobbin B of the large gear 1 in the stopped state is a layer that runs straight in the longitudinal direction like the intermediate layer in FIG.
Suitable when tensile strength is required.

The coating of the heat shrinkable tape T is performed by the tape wrapping device shown in FIG.

The tape wrapping device is arranged on the large gear 1 on the downstream side of the twist wheel so as to be superposed on the large gear 1 at a predetermined interval, and comprises a large gear 6 and a guide 7. A similar tape wrapping device is also arranged on the twist wheel shown in FIG. 1, but it is not shown.

The large gear 6 is basically the same as the large gear 1 in the twist wheel, but the bobbin B2 supported is one wound with a heat-shrinkable tape T.

The guide 7 is composed of plate-like bodies which come into contact with the tape T which is unwound from the bobbin B2 from above or below, and is installed beside the supporting position of the bobbin B2.

The mandrel M is, as shown in FIG. 4, provided by respective feed rollers 8 and 9 arranged on the upstream side of the twist wheel and the downstream side of the tape wrapping device, respectively.
It is sent in synchronization with the rotation of the large gear 1 of the twist wheel and the large gear 6 of the tape wrapping device.

Further, the tape wrapping device and the roller 9
A cutter 10 supported by an air cylinder 11 so as to be capable of coming into contact with and separating from the mandrel M, and rotationally driven by a motor 12 is provided between and. Therefore,
By appropriately operating the cutter 10, a reinforcing base material having a predetermined length can be obtained.

In the manufacturing apparatus configured as described above, the thermosetting synthetic resin-impregnated thread F drawn from each bobbin B1 of the twist wheel is guided to the surface of the mandrel M through each guide hole 2a, and the mandrel M is drawn. By rotating the large gear 1 with the movement of 1), one or more layers are wound around the surface of the mandrel M. Depending on the case, the heat shrinkable tape T is further wound. Then, the cutter 10
Is rotated closer to each other to be cut into a reinforcing base material having a predetermined length and molded. At this time, the tape T prevents the thermosetting synthetic resin from flowing out. Finally, the mandrel M is extracted from the reinforcing base material to obtain a hollow fiber-reinforced plastic.

[0030]

Since the present invention is configured as described above, it has the following effects.

That is, it has become possible to efficiently manufacture a tubular fiber reinforced plastic which is lightweight and has desired length and physical properties. In addition, the productivity can be increased 10 times or more as compared with the formation of the reinforcing base material by the composition device.

[Brief description of drawings]

FIG. 1 is a perspective view of a twist wheel that constitutes the manufacturing apparatus of the present invention.

FIG. 2 is a partial cross-sectional view of a twist wheel that constitutes the manufacturing apparatus of the present invention.

FIG. 3 is a perspective view of a twist foil and a tape wrapping device that constitute the manufacturing apparatus of the present invention.

FIG. 4 is a schematic front view of a twist wheel, a tape wrapping device, a mandrel feeding device, and a mandrel cutter that constitute the manufacturing apparatus of the present invention.

FIG. 5 is a perspective view illustrating a layer structure of a tubular fiber reinforced plastic.

FIG. 6 is a schematic perspective view of a conventional yarn winding device (filament winder).

[Explanation of symbols]

 1 Large Gear (Rotating Gear) 1a Hole 2 Thread Guide 6 Large Gear 7 Tape Guide 8 Feed Roller 9 Feed Roller 10 Cutter B1 Thread Bobbin B2 Tape Bobbin M Mandrel T Heat Shrinkable Tape

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29C 70/06 B65H 54/02 A 55/04 // B29K 105: 08

Claims (3)

[Claims] 1. A pre-former is formed by a twist wheel in which a plurality of yarn bobbins are rotatably supported on the side surface of a rotary gear having a mandrel passage hole at the center thereof, and a yarn guide is arranged around the holes. A method for producing a tubular fiber-reinforced plastic, which comprises winding a yarn impregnated with a synthetic resin around a mandrel in any of the steps to form a reinforcing base material, molding the reinforcing base material, and removing the mandrel from the reinforcing base material. 2. The method for producing a tubular fiber-reinforced plastic according to claim 1, wherein a step of winding a heat-shrinkable tape is added between the yarn winding step and the molding step. 3. A twist wheel in which a plurality of yarn bobbins are rotatably supported on the side surface of a rotary gear having a hole for passing a mandrel at the center thereof, and a yarn guide is arranged around the hole, and a downstream thereof. An apparatus for manufacturing a tubular fiber reinforced plastic, which comprises a cutter disposed on the side of the mandrel so as to be able to contact and separate from the mandrel, and a molding device.