JPH0357626A - Reinforcing material for fiber reinforced plastic having three-dimensional curved surface and manufacture thereof - Google Patents

Abstract

PURPOSE:To make the appearance of a molded form excellent and also to enhance impregnation of resin into fiber and to prevent generation of dispersion of strength by implanting many pieces of pins into the surface of a forming mold having a three- dimensional curved surface and laminating long fiber for reinforcement so that it is passed among the pins and molding the fiber molded form integrated with resin. CONSTITUTION:Many pins 2 are implanted into the whole surface of a molding face 1a so that these are distributed in the nearly equiintervals. Long fiber Y for reinforce ment is immersed in a resin liquid tank 4 via an immersion roll 6 and impregnated with resin liquid. Long fiber Y is laid along the molding face 1a of a forming mold 1 by a traverse guide 5 and laminated whole this fiber is led so as to sew the intervals of many pins 2. In the case of molding such a fiber molded form S as this, long fiber Y for reinforcement is desirably laminated in a range of a plurality of layers. Further the directions of long fiber Y are mutually crossed between these layers and the rein forcement direction is desirably regulated to isotropy. When lamination has been completed, the fiber molded form S is released from the forming mold 1 at a time wherein resin is semicured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a reinforcing material for fiber-reinforced resin having a cubic curved surface using long fibers as reinforcing fibers, and a method for producing the reinforcing material.

[Prior art]

Conventionally, when shaping a fiber-reinforced resin molded body having a three-dimensional curved surface such as a helmet, short fibers (chipped fibers) have been used as reinforcing fibers. Although long fibers have a mechanically higher strength utilization rate than short fibers, the reason why short fibers are used in this way is as follows.
This is because long fibers create wrinkles when they are made into a sheet-like fabric and are made to conform to a three-dimensional curved surface, making it difficult to conform to the curved surface. This is because sheet-like fabrics made of long fibers not only deteriorate the appearance of the shaped body due to the wrinkles, but also have drawbacks such as non-uniform impregnation of the resin into the fibers, resulting in variations in strength.

[Problem to be solved by the invention]

The object of the present invention is to manufacture a reinforcing material for fiber reinforced resin having a cubic curved surface that uses mechanically advantageous long fibers as reinforcing fibers and that conforms well to the cubic curved surface and does not cause wrinkles. The purpose is to provide a method.

Another object of the present invention is to provide reinforcement for fiber-reinforced resin having a cubic curved surface, which improves the appearance of the precept-shaped body and also improves the impregnation of the resin into the fibers to prevent variations in strength. The aim is to provide materials.

[Means to solve the problem]

The method for producing a reinforcing material according to the present invention that achieves the first object is to plant a large number of bottles on the surface of a curved shape having a cubic curved surface, and apply long reinforcing fibers to the surface of the curved shape. This method is characterized in that the fibers are laminated so that the pins pass through each other, and the fibers are integrated with the resin to form the fibers.

In addition, the fiber-reinforced resin molded body of the present invention which achieves the above-mentioned other objects is such that the reinforcing long fibers form a fiber molded body having a cubic curved surface and are integrally molded with the resin. A large number of through holes are arranged in a dotted manner.

In the present invention, both conventionally known inorganic fibers and organic fibers can be used as the long fibers used for resin reinforcement. The long fibers are preferably carbon fibers or glass fibers. High-strength, high-modulus fibers such as aramid fibers are used, but in addition to these, polyamide fibers, polyester fibers, and polyvinyl chloride fibers with specially increased strength and modulus are used. Polyethylene fibers can also be used.

As the resin used in the present invention, thermosetting resins are preferred, but thermoplastic resins can also be used. Examples of the thermosetting resin include resins such as epoxy, unsaturated polyester, vinyl ester, polyimide, and phenol. Further, examples of the thermoplastic resin include resins such as polyamide, polyester, polyethylene, polypropylene, polyacecool, and polycarbonate.

FIG. 1 shows the molding process in the method for producing a reinforcing material for fiber-reinforced resin according to the present invention, and shows the process of molding a reinforcing material for a helmet.

Reference numeral 1 is of a cylindrical shape, and has a cylindrical surface 1a made of a substantially spherical cubic surface on its surface. A large number of pins 2 are embedded in the entire surface of the molding surface 1a so as to be distributed at approximately equal intervals.

On the other hand, 3 is Y for reinforcing long fibers such as carbon fiber and glass fiber.
4 is a resin liquid tank in which a resin liquid in which a thermosetting resin such as an epoxy resin is dissolved in a solvent is stored. Reference numeral 5 denotes a traverse guide which reciprocates in the radial direction along the contoured surface 1a of the mold l at an arbitrary angle. The traverse guide 5 may be driven automatically or may be moved manually.

When forming a fiber shaped body S from the reinforcing long fibers Y using such a device, the reinforcing long fibers Y are released from the bobbin 3 and placed in the resin liquid tank 4 using the dipping roller 6. to impregnate the resin liquid. The reinforcing long fibers Y impregnated with this resin liquid are guided along the molding surface 1a of the precept mold 1 by a traverse guide 5, and are laminated while being guided so as to weave between a large number of pins 2. In such a lamination operation, when the reinforcing long fibers Y pass between adjacent pins 2, their fiber sides are held by the pins 2 so that they do not slip down, and the end portions are held at the circumferential edge of the shaped surface 1a. Tie it around bottle 2 and fold it back. By repeating this, the entire surface of the molding surface 1a is covered with the reinforcing long fibers Y,
A fiber molded body S having a cubic curved surface is formed.

In the formation of such a fiber-shaped body S, it is desirable to laminate the reinforcing long fibers Y over a plurality of layers, and between these layers, the directions of the reinforcing long fibers Y are made to intersect with each other,
It is desirable that the reinforcement direction is isotropic. In other words, if there are two layers, the intersection angle of the reinforcing long fibers Y should be 90
゜, 60゜ for 3 layers, 45'' for 4 layers,
If there are five layers, it is desirable that they be equally distributed at an angle of 36 degrees.

After the lamination of the reinforcing long fibers Y is completed in this manner, the fiber molded body S is removed from the mold l when the resin is semi-cured (B staged).

At this time, the resin may be cured by simply leaving it at room temperature for a certain period of time if the resin is a room temperature curing type, but if the resin is heated, the time until semi-hardening can be shortened.

Figures 2 and 3 show the fiber formed body S after being removed from the mold 1.
It shows. The demolded fibrous body S has a large number of through holes 12 formed by the pins 2 in its plane.

Further, since the fiber molded body S is formed by winding linear fibers around the preform 1, the fiber molded body S has a smooth cubic curved surface along the preform surface 1a, and has no wrinkles at all.

The wrinkle-free fiber shaped body S formed in this way becomes a reinforcing material for fiber-reinforced resin, and when inserted into a mold and main-molded with resin as described later, a three-dimensional curved surface with a good appearance can be formed. It can be made into a fiber-reinforced resin with

In addition, as another usage method, the resin can be cured as it is to make a fiber-reinforced resin. In this case, it will become a precept-shaped body with many through holes open, so
Suitable for applications requiring breathability. Furthermore, by covering the surface with a semi-permeable fabric (a fabric that allows only air to pass through but not water), it is possible to make a precept-shaped body that does not allow water to pass through and has good breathability.

When the above-mentioned fiber molded body S is used as a reinforcing material and heated and molded together with resin in a mold, the fiber molded body S is
As shown by the imaginary line (dashed line) in the figure, it is embedded in the resin R, and the resin R is impregnated into the fiber shaped body S, and is heated and hardened to be integrated. When the resin R impregnates the fiber molded body S in this way, it also permeates through the through holes 12 that are opened in the plane, so that the bond with the fiber molded body S is further strengthened by passing through the through holes 12. Try to eliminate variations in strength.

When forming a helmet using the fiber molded product S, the fiber molded product S is used only in the upper part and the other parts are made of resin R only, as in the case of the helmet 30 in FIG. It may be reinforced with the same short fibers as in the past, or alternatively, the fiber molded body S may be used throughout, as in Helmet I-30 shown in FIG. In either case, the fiber shaped body S corresponds well to the three-dimensional curved surface without wrinkles, and does not cause deterioration in the appearance of the helmet or variation in strength.

In addition, since the fiber fiber-reinforced body S has a higher mechanical reinforcement efficiency than that reinforced with short fibers, a smaller amount of fiber is required to achieve the same strength, and the entire helmet (fiber-reinforced resin fiber-reinforced body) can be made lighter.

The present invention is not limited to the above-mentioned helmet shape, but can be preferably applied to other fiber-reinforced resins. for example,
Cowlings of motorcycles, hulls of yachts, boats, etc.
It can be used for car bodies, etc.

(Effects of the Invention) As described above, in the manufacturing method of the present invention, a large number of bottles are planted on the surface of a circular mold having a cubic curved surface, and reinforcing long fibers are placed between the pins on the surface of the circular mold. 4. Since the fibers are laminated so as to be inserted through the fibers and the fibers are integrated with the resin, long fibers are used as reinforcing fibers, which are mechanically advantageous, and they blend well with the three-dimensional curved surface, causing wrinkles. It is possible to obtain a reinforcing material for fiber-reinforced resin that does not require any damage.

Further, in the reinforcing material according to the present invention, the reinforcing long fibers form a fiber shape body having a cubic curved surface and are integrally molded with a resin, and a large number of through holes are dispersed in a dotted manner on the three-dimensional curved surface of the fiber shape body. This not only improves the appearance of the fiber-reinforced resin shaped body molded using this material, but also improves the impregnation of the resin into the fibers and prevents variations in strength. In addition, if the resin is cured without changing the reinforcing material, a perforated orifice having good air permeability can be obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the preforming step in the method for producing a fiber-reinforced resin molded body of the present invention, Fig. 2 is a plan view of the fiber shaped body obtained in the preforming process, and Fig. FIG. FIGS. 4 and 5 are longitudinal cross-sectional views of helmets shaped using similar fiber shaped bodies, respectively. l... precept type, la... molding surface, 2... bottle, 3
... Thread bobbin, 4... Resin liquid tank, 5... Traverse guide, S... Fiber molded body, R... Resin.

Claims (2)

[Claims] (1) Fiber molding in which a large number of pins are planted on the surface of a mold having a cubic curved surface, reinforcing long fibers are laminated on the surface of the mold so as to pass between the pins, and integrated with resin. 1. A method for manufacturing a reinforcing material for fiber reinforced resin having a cubic curved surface, the method comprising molding a reinforcing material for fiber reinforced resin. (2) The reinforcing long fibers form a fiber molded body having a cubic curved surface and are integrally molded with a resin, and the three-dimensional curved surface of the fiber molded body has a large number of through holes dispersed in a dotted manner. A reinforcing material for fiber-reinforced resin.