JPH0773888B2 - Reinforced plastic spring material and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a linear or strip material for a reinforced plastic spring and a method for producing the same.

[Prior Art] A conventional method for manufacturing a reinforced plastic spring is, for example, as disclosed in Japanese Patent Application Laid-Open No. 52-34161, "Coil Spring Made of Reinforced Plastic", after impregnating a fiber bundle with a resin, a thin Al tube is formed. Introduced and shaped into the shape of the coil spring, after heat curing,
A method for chemically dissolving and demolding an Al tube, and JP-A-52-36250
There is a method of coating vinyl or nylon, as shown in Japanese Patent Laid-Open Publication "Coil Spring for Reinforcement".

[Problems to be Solved by the Invention] In order to manufacture a long material which is indispensable for continuous molding of springs, a thermosetting resin having a low viscosity impregnated in a fiber-reinforced bundle should be retained so that it does not exude. I have to. As mentioned above, there is a method of introducing it into Al pipe or Cu pipe, but it is technically difficult to make it long, and there is a problem that the cost is high even for relatively short ones. The coating method has a problem in that the influence of heat during coating affects the thermosetting resin inside.

[Object and Structure of the Invention] The present invention was made for the purpose of solving the above problems of the present invention, in which a reinforcing fiber bundle is impregnated with a thermosetting resin such as epoxy or polyester, and molded into a linear shape or a band shape. After that, in order to prevent the impregnated resin from seeping out or adhering to another, cure the UV curable resin on the material surface and provide a flexible thin film on the surface of the linear or band-shaped material. A material for a spring made of plastic and a method for manufacturing the same.

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 3 shows an embodiment of a reinforced plastic spring material according to the present invention. A reinforcing fiber bundle F impregnated with a thermosetting resin is arranged around the core material C, and a flexible thin film S cured by ultraviolet irradiation is provided around the core material C to hold the thermosetting resin before heat treatment. Is shown.

The present invention employs a method in which a reinforcing fiber bundle impregnated with a thermosetting resin is shaped by a shaping die, an ultraviolet curable coating material is applied to the entire surface, and the coating material is cured by an ultraviolet irradiation device.

FIG. 1 shows an apparatus for carrying out the present invention, and FIG. 2 shows a process for producing a reinforcing fiber bundle before carrying out the present invention.

First, the manufacturing process shown in FIG. 2 will be described.
As shown in the figure, a core material 5 is fed from the reel supply device 1, and a fiber bundle 6 shaped by a fiber bundle delivery reel 3 rotating around the core material 5 is wrapped around the core material 5 by a lapping machine 2. Is wound into a bundle and wound on the reel winding device 4.

At this time, the core material 5 having a linear or strip-shaped cross section is used, and the fiber bundle is formed in a similar shape.
Further, carbon, aramid, or glass fiber is used as the fiber bundle.

Then, the wound reinforcing fiber bundle is impregnated with a thermosetting resin. The reinforcing fiber bundle impregnated with the thermosetting resin is applied to the apparatus shown in FIG.

The reinforcing fiber bundle 7 impregnated with the thermosetting resin is passed from the reel supply device 1 through the molding die 8 and the ultraviolet curable coating material application device 9. The ultraviolet-curable coating material application device 9 is supplied with the ultraviolet-curable coating material from the coating material tank 10. The reinforcing fiber bundle 7 which has been subjected to the entire surface coating of the ultraviolet curable coating material by the coating material coating device 9 is passed through the ultraviolet ray irradiation device 11 to cure the coating material and form a flexible thin film. At this time,
It is necessary to irradiate ultraviolet rays to form a thin film before the impregnating resin and the coating material are mixed. It is extremely important to use an ultraviolet curable coating material that can solidify a 0.3 mm thick film in less than 2 seconds.

The properties required of the material forming this thin film are as follows.

(1) Does not react with the impregnated thermosetting resin.

(2) The resin can be sufficiently retained until the thermosetting treatment is completed.

(3) A spring that does not have a bad effect in practical use.

(4) A thin film can be continuously formed on a long material.

As such an ultraviolet-curable coating material, a urethane-based ultraviolet coating material or an epoxy-based ultraviolet coating material is suitable for a thermosetting resin such as an epoxy resin or a polyester resin impregnated in the reinforcing fiber bundle.

The linear or strip-shaped thermosetting resin-impregnated spring material continuously formed as described above and provided with a flexible thin film on the surface is then formed into the required spring shape and subjected to thermosetting treatment. Then, the spring is manufactured.

The thickness of the thin film must be at least about 0.1 mm so that the thin film on the surface will not be damaged when it is formed into a spring shape. If this thickness exceeds 1.0 mm, the rigidity of the material becomes too high and it may be damaged by bending stress, which is not preferable. Of course, in order to increase the film thickness, it is necessary to increase the amount of UV irradiation.
Or, the processing amount per hour is reduced, and neither is economical.

EFFECTS OF THE INVENTION According to the present invention, it is possible to continuously manufacture a thermosetting resin-impregnated spring material having a thin film on its surface. That is,
The surface of the thermosetting resin before curing is completely covered with UV-curable coating, and only the coating is cured within a short time to form a flexible thin film on the outer surface. It is possible to continuously manufacture a spring material that prevents the resin in front from leaching to the outside without separating from the fiber bundle.

If an ultraviolet-curable coating material that is immediately hardened by being irradiated with ultraviolet rays is used, more continuous and high-speed manufacturing is possible.

It is not necessary to remove the UV-curable resin thin film on the surface after the spring molding and heat curing, and it is expected that the surface performance of the UV-curable resin can be improved against the environment during practical use.

On the other hand, since the reinforced plastic spring material according to the present invention is provided with the resin film on the surface thereof, there is no resin bleeding from the inside, and molding into a spring shape and subsequent heat treatment can be smoothly performed.

[Brief description of drawings]

FIG. 1 shows an example of an apparatus for carrying out the present invention. FIG. 2 shows a fiber bundle manufacturing process. FIG. 3 shows a spring material manufactured according to the present invention with a partial cross section. C ... Core material, F ... Reinforcing fiber bundle impregnated with resin, S ...
Flexible thin film, 1 ... Reel supply device, 2 ... Lapping machine, 3 ... Fiber bundle delivery reel, 4 ... Reel winding device, 5 ... Core material, 6 ... Fiber bundle, 7 ... Heat Reinforcing fiber bundle impregnated with curable resin, 8 …… Molding die, 9 ……
UV-curable paint applicator, 10 …… paint tank, 11 ……
UV irradiation device.

Claims (2)

[Claims] 1. A reinforced plastic spring is obtained by impregnating a reinforcing fiber bundle with a thermosetting resin to form a linear or band-shaped material, molding the linear material or the band-shaped material, and thermosetting the same. , A material for fiber-reinforced plastic springs, which is obtained by applying a UV-curable coating material to the surface of a linear or band-shaped material impregnated with a thermosetting resin and curing it by UV irradiation.
A spring material made of reinforced plastic, characterized by having a flexible thin film with a thickness of 0.1 mm to 1.0 mm. 2. A reinforcing fiber bundle is impregnated with a thermosetting resin to form a linear material or a band-shaped material, the linear material or the band-shaped material is molded, and heat-cured to form a reinforced plastic spring. In the method for producing a material for a fiber-reinforced plastic spring, by applying a UV-curable resin to the surface of the linear or strip-shaped material impregnated with the resin, and irradiating with ultraviolet rays to cure the UV-curable resin A method of manufacturing a reinforced plastic spring material, comprising forming a flexible thin film on a surface portion of the material.