JPS6189829A - Manufacture of fiber reinforced plastic structure - Google Patents

Abstract

PURPOSE:To enable to twist continuous fiber bundle by a method wherein a resin impregnating tank is rotated at the desired winding position of a molding tool. CONSTITUTION:A bobbin 2, onto which continuous fiber bundle is wound, is attached in a resin impregnating tank 1, which can be rotated by means of a rotating shaft 4 installed on a rotating table 3. The continuous fiber bundle is drawn out of the liquid resin 6 in the resin impregnating tank 1, squeezed through a die 7 and wound onto a take-up unit. During manufacturing a structural body, when the fiber bundle 5 reaches a hook 9', the rotation of a main column 8 is stopped and at the same time the resin impregnating tank 1 is rotated by means of the rotating shaft 4, resulting in twisting the fiber bundle 5. Due to the twisting of the fiber bundle through the rotation of the whole resin impregnating tank, the twisting operation can be performed very easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a fiber-reinforced resin-filled body made of continuous fiber bundles impregnated with resin.

[Conventional technology]

In recent years, British Patent Publication No. GB 2004835A,
As described in the same publication No. GI32103572A, etc., a bundle (low pink or strand) of continuous fibers such as carbon fibers and glass fibers is impregnated with a thermosetting resin solution, etc., and then a suitable mold, mandrel and winding are applied. By wrapping it around a fixture, forming it into a specified shape, and then curing it,
A method for manufacturing -dimensional to three-dimensional fiber reinforced resin structures has been developed. This method is positioned as an extension of the filament winding method. According to this manufacturing method, it is possible to manufacture structures having various shapes and being lightweight.

[A far point while the invention is trying to solve]

The fiber-reinforced resin structure manufactured by the above method is very strong against stress in the longitudinal direction of the fibers, but when subjected to stress in the direction perpendicular to the fibers, the fibers may The problem is that the adhesive is weak and may peel off.

In addition, when impregnating a continuous fiber bundle with resin or wrapping a resin-impregnated continuous fiber bundle around a wrapping jig, air may be trapped between the fibers or fiber bundles, resulting in a structure with bubbles. However, a structure containing air bubbles like this has a problem in that it is inferior in strength. In order to remove air bubbles mixed into the fiber bundle, it is possible to squeeze the resin liquid on the fiber bundle pulled up from the resin gfl layer using a die and squeeze it strongly, but if you squeeze it too hard, part of the fRR will break. By making it possible to avoid problems such as cedar fiber bundles, it is possible to obtain a flexible structure without peeling between the fibers in the direction perpendicular to the length of the fibers. This has the advantage that air bubbles in the fiber bundle can be squeezed out.

However, in the manufacture of structures, a good method of twisting a continuous fiber bundle at a desired length in the longitudinal direction is described, but this paper does not specifically mention Method A for large structures. The present invention aims to provide a method for twisting continuous fiber bundles.

[Means for determining rrf at 11 points] The entire method for manufacturing fiber-reinforced resin (hereinafter referred to as FRP) structures of the present invention is to collect resin from a resin impregnating bath having a winding shaft around which a continuous fiber bundle is wound. The continuous fiber bundle impregnated with the resin is pulled out and wrapped around a mold to obtain the desired fiber, and the resin-impregnated seed is rotated at the desired wrapping point of the mold.

The continuous fiber used in the method of the present invention is characterized in that a resin-soaked horizontal fiber drawn from a resin-soaked seed is twisted and wound around a mold.

Glass fibers, carbon fibers, etc. conventionally used in pF filters can be used. For example, 2,000 to 4,000 glass fibers with a diameter of about 23 μm are pulled together to make one row, or a fiber with a diameter of about 7 μm is used. A single roving made by aligning 15,000 carbon fibers, or a strand made by collecting several to dozens of these rovings is used.

The resins to be soaked into these continuous fiber bundles include epoxy resins, unsaturated polyester resins, vinyl ester resins, and phenol m/Jlr 4%, which have been conventionally used in FRP. Add curing accelerator and adjust stitching accordingly.

The continuous fiber bundle may be cured to some extent by the time the winding of the continuous fiber bundle around the mold is completed.

Alternatively, it may be heated and cured after winding.

In the present invention, the winding shaft around which the continuous fiber bundle is wound is provided in the resin impregnation tank, but it may be immersed in the resin liquid of the impregnation tank and attached at a cape, or it may be attached to the top or outside of the impregnation tank. It may also be possible to attach it to. In the latter case, the continuous fiber bundle unwound from the first winding shaft is guided into the impregnated 1 fJ (resin solution) by a guide roll or the like, and then pulled out from the impregnation tank. It is preferable to provide a dipping die for removing the excess resin liquid impregnated into the impregnating tank, and this die is preferably installed on the rotary shaft KM for horizontally rotating the impregnating tank.However, .

The die may be provided at a position above the impregnation 1: and parallel to the above-mentioned line.

The companion rotating shaft that rotates the resin impregnation tank may be directly connected to the bottom of the impregnation tank, but if a turntable is provided at the tip of the shaft, the impregnation tank may be placed on the turntable. It is better to make it . The rotating shaft can be rotated in either the left or right direction as desired.

Also, when the fiber bundle is twisted in the impregnation tank.

In order to prevent the PfS thread from reaching the winding axis of the fiber bundle, a clamping device is provided at the end of the drawing mechanism such as a die to hold the fiber while the twisting is being applied. good. This clamp device Nf grips the fiber bundle when the rotation shaft starts rotating.

It is preferable to automatically release the grip when the rotation is completed.

〔Example〕

Examples of the present invention will be described below with reference to the drawings, but the present invention is not limited to these examples.

, α 11ψ is 1 old θ) 1 tL eggplant (
θ11] At C21, the bobbin 2 on which the continuous fiber bundle is wound is attached to the metal dipping 1, and then the resin dipping 11
``i'' shows an example in which it is installed on a rotary table 3 and rotated by a rotating shaft 4.As can be seen from the figure.

The continuous coating is pulled out from the sealing liquid 6 of the impregnation 1, squeezed by the die 7, and wound into a roll.

As shown in FIG. 2, the tightening device has a main pillar 8 with a plurality of pillars 9 planted on it, and a hook 9' at the tip of each pillar 9.
A resin-impregnated continuous fiber bundle 5 is applied to the fibers, and the fiber bundle 5 is wrapped between the struts 9 and 9. The winding is carried out by rotating and transmitting the main pillar 8 as 14fl, and by traversing the fiber bundle 5 with a traverse (□116).

In the case of this embodiment, a triangular prism-shaped FM<3 structure 10 is made, but the part of the frame 11 parallel to the main pillar 8 is formed of untwisted fiber bundles, and the frame 12 that connects the 7 frames 111 is formed from twisted fiber bundles. For example, when the fiber bundle 5 comes to the hook 9', the main pillar 8
Start the rotation.

When the impregnating tank 1 is rotated by the rotation 1 pongee 4, the fiber bundle 5
Twisting occurs. At this time, the fiber bundle 5 is held at a predetermined position with the clamp 13 so that the twist is applied only to a desired range.

If necessary, hot air or the like may be applied to the twisted fiber bundle to partially accelerate the hardening of the soaked surface fat and prevent the twist from returning.

In addition, when the rotation of the main pillar 8 is slow in the above, it is also possible to twist the fiber bundle 5 without slowing down the rotation of the main pillar 8. In the figure, 14 indicates a twisted portion.

The resin-impregnated continuous fiber bundle was wound around the winding device 4 as described above, and the resin was cured.

Main pillar 8. The entire body of the PfLP was dismantled and removed.

FIG. 3 is a diagram showing a second embodiment of the present invention, in which a bobbin 2 is disposed above the impregnation 1.

In the figure, 15 indicates a guide roll that guides the fiber bundle 5.

Otherwise, the same symbols as in FIG. 1 represent the same meanings.

In the case of the second embodiment, the fiber bundle unwound from the bobbin 2 is immersed in the resin liquid 6 by the guide roll 15, pulled up, and then twisted when necessary in the same manner as in the first embodiment. [Effect] The present study was conducted by rotating the entire resin impregnation tank. This is because it is possible to apply twist 9 to Yawei Dong.

The twisting operation is simple, and the fiber bundle winding device, which is a mold, has the advantage that conventional devices can be used as is. The present invention is: FR to be filtered
When the P structure body is large, it is not possible to rotate the main pillar with its axis horizontal, so it is particularly advantageous in that the seal part of such a large Shinyi body can be formed from twisted fiber bundles. It is.

The F-P structure obtained by the method of the present invention clearly exhibits superior strength in terms of torsional rigidity compared to a structure formed from untwisted fiber bundles. It can be applied not only to blue bodies, but also to the manufacture of small items such as automobile steering wheels.For example, the spoke part connecting the central boss metal fitting and the ring part can be made from twisted fiber bundles.

In the present invention, when the continuous fiber bundle wound around the bobbin has already been impregnated with resin, the resin impregnation bath may be omitted and only the bobbin may be held on a rotary table.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a first embodiment of the present invention. Figure 2 is a perspective view of the device (partially). FIG. 3 is a cross-sectional view of the resin immersion to show an embodiment of the song of the present invention. In the figure. 1...Resin impregnation 2...Bobbin 3...Rotating seedling 4...Rotating shaft 5...Continuous fiber bundle 6...
・Resin liquid 7... Dice 8... Main pillar 9... Support 9'... Hook 10... Groove body

Claims (1)

[Claims] A continuous fiber bundle impregnated with resin is pulled out from a resin impregnation tank having a winding shaft around which the continuous fiber bundle is wound, and is wound around a mold and laminated to obtain a structure. A method for manufacturing a fiber-reinforced resin structure, which comprises twisting a resin-impregnated fiber bundle pulled out by rotating the fiber bundle and winding it around a mold.