JPH06277327A - FRP made downhill stock pole and its manufacturing method - Google Patents

Abstract

(57) [Summary] [Object] The present invention aims to easily manufacture a curved stock made of FRP. [Structure] A wound sheet 6 is wound by a winding body 3, and the wound wound sheet 6 (cylindrical body 7) is press-fitted into a molding groove 8 of a molding split die 9 to be inserted into the cylindrical body 7. The stock pole is molded in the split mold 9 while pressurizing the cylinder 7 from the inside to the outside by pumping gas.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FRP stocking pole for downhill and a manufacturing method thereof.

[0002]

2. Description of the Related Art The stock used by general skiers is straight, but the stock used by downhill athletes has the shape of the athlete in order to reduce wind resistance as much as possible. It is curved at several places.

Conventional stocks for downhill athletes are made of light alloys such as aluminum and duralumin. This light alloy stock is made by first forming a light alloy pipe material and then bending this pipe material by appropriate means (manual or mechanical processing) according to the body shape of the athlete to use. Plastic deformation occurs, which causes variations in quality, and only a skilled engineer can bend it properly.

Further, in order to make the strength of the light alloy pipe material higher, the diameter must be increased to a certain extent, and the larger the diameter of the pipe material is, the higher the wind pressure resistance becomes, and the sliding down the comma for 1 second. Not suitable as stock for athletes.

The present invention solves the above drawbacks by using the FRP.
It is a technical subject to provide a stock pole for skiing and a manufacturing method thereof.

[0006]

The gist of the present invention will be described with reference to the accompanying drawings.

A flexible tubular body 2 is fitted on a thin core material 1 to form a wound body 3, and inorganic fibers 5 are aligned in one direction on a base material 4 made of inorganic fibers. The wound sheet 6 is provided by fixing the inorganic fiber 5 to the base material 4 with a resin.
The winding body 3 is formed on one edge of the winding sheet 6 in parallel with the direction of the inorganic fibers 5, and the winding sheet 6 is wound by the winding body 3. The core material 1 is pulled out to form a cylindrical body 7, a molding split mold 9 having a molding groove 8 having a desired shape is formed on the molding surface, and one end of the tubular body 2 is closed to form the cylindrical body 7 in the molding groove 8. After press-fitting, the molding split mold 9 is closed, and the molding split mold 9 is heated and pressurized while feeding gas into the tubular body 2,
FRP characterized by demolding after cooling and finishing
The present invention relates to a method for manufacturing a downslope stock pole.

Further, the present invention relates to an FRP stocking pole for downhill, which is manufactured by the manufacturing method according to claim 1.

[0009]

The inorganic fibers 5 are aligned in one direction because the stock is required to have the highest rigidity in the length direction.

When the wound sheet 6 is wound around the winding body 3, since the thin core material 1 is disposed inside the winding body 3, the tubular body 2 is flexible even if the tubular body 2 is flexible. The shape of 2 is retained, and the winding work can be performed smoothly.

Since the cylindrical body 7 from which the thin core material 1 has been removed is flexible, it can be easily bent by hand in accordance with the molding groove 8 of the molding split die 9. Even if it is curved, the cylinder body 7 can be smoothly press-fitted into the molding groove 8.

The cylindrical body 7 is press-fitted into the molding groove 8 of the molding split die 9,
When the molding split mold 9 is heated and pressed, gas is sent into the tube body 2, so that the cylinder body 7 is pressed from the inside to the outside and pressed against the surface of the molding groove 8, and the outer peripheral surface of the molded product is the surface of the molding groove 8. In addition to being molded into a clean surface that conforms to, the molded product conforms to the diameter of the molding groove 8 even if the diameter of the tubular body 7 is slightly smaller than the diameter of the molding groove 8.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show one embodiment of the present invention.
This will be described below.

A thin core material 1 having a predetermined length is formed from a steel wire material.

Subsequently, synthetic rubber (in the embodiment shown in the drawings, an inner diameter of 3 m
The tubular body 2 is formed of m, neoprene rubber having an outer diameter of 6 mm) or a thermoplastic resin (for example, vinyl chloride, polyethylene, nylon, urethane, etc.). The tube body 2 may be made of any material as long as it has flexibility. When a synthetic rubber is used, the synthetic rubber is allowed to remain in a molded article described below, but when a thermoplastic resin is used, a product is heated and melted.

The tubular body 2 is fitted on the thin core material 1 to form the winding body 3.

Subsequently, the woven glass cloth is impregnated with a thermosetting resin (eg, epoxy resin, vinyl ester resin, polyester resin) to obtain a prepreg, and the thermosetting resin (the above-mentioned glass woven cloth is placed on the prepreg. The same length as the resin impregnated in 1.) Length 1700 mm
The wound sheet 6 is formed by arranging the carbon fiber prepreg in which the carbon fibers of 1 are aligned in one direction. Due to the viscosity of the resin, even the unidirectionally aligned carbon fibers can be arranged in an orderly manner, and the unidirectionally aligned carbon fibers can be prevented from falling apart when wound by the winding body 3.

During mass production on the line, carbon fiber, glass woven cloth (or glass woven prepreg prepared in a separate step) and resin are unidirectionally aligned on a mount having a surface coated with a thermosetting resin. Polyethylene films for preventing flow and resin adhesion to the line are laminated in this order, and heated and pressed to form the wound sheet 6. Each part of the wound sheet 6 is integrated by the resin on the mount, and the unidirectionally aligned carbon fibers are arranged in an orderly manner. At the time of use, the mount and polyethylene film are peeled off before use.

In summary, the wound sheet 6 is constructed so that the unidirectionally aligned carbon fibers do not come apart during winding.

The reason why the carbon fibers are aligned in one direction is that the ski stock requires the most rigidity in the longitudinal direction. Therefore, when the same number of carbon fibers are used, it is natural to use a woven fabric instead of the unidirectionally aligned state. Since the number of carbon fibers in the direction is halved, the rigidity in the length direction of the stock decreases.

The length of the unidirectionally aligned carbon fibers arranged in parallel is determined in consideration of the diameter when wound and the diameter of the molding groove 8 of the molding die 9 described later.

The inorganic fiber 5 may be any fiber such as glass fiber, aramid fiber, polyethylene fiber, etc. other than carbon fiber.

On the wound sheet 6 thus formed, carbon fibers 10 aligned in the bias direction (± 45 ° direction) are further arranged.

The width L ₁ of the carbon fiber 10 in the bias direction,
The disposition position of the carbon fiber 10 in the bias direction is appropriately designed.

The carbon fiber 10 in the bias direction is the carbon fiber 10
As shown in FIG. 6, the carbon fiber 10 has two layers (+ 45 ° is one layer and -45 ° is one layer) at the center between the outer peripheral surface of the tubular body 2 and the outer peripheral surface of the molded product. ₁ and L ₂ are considered. The + 45 ° and −45 ° bias layers may be combined to form a single layer.

Subsequently, the winding body 3 is attached to one end of the wound sheet 6.
Are arranged in parallel with the carbon fibers (see FIG. 1), and the wound sheet 6 is wound around the wound body 3 (see FIG. 2). Roll 3
Since the thin core material 1 exists in the, the shape of the tube body 2 is maintained, and the flexibility of the tube body 2 does not hinder the winding work.

In this way, the thin core material 1 is pulled out from the finished winding body 3 to form the flexible cylindrical body 7.

Then, a molding split mold 9 composed of upper and lower molds having desired molding grooves 8 as shown in FIG. 3 is prepared.

Subsequently, one end of the tubular body 2 is closed by an appropriate means (adhesive in the embodiment shown in the drawings) to have flexibility along the molding groove 8 formed in the lower mold of the molding split mold 9. While appropriately bending the tubular body 7 by hand, press the tubular body 7 into the molding groove 8 of the lower mold, align the upper mold with the lower mold and bring both molds into close contact with each other, and the air in the tubular body 2 is about 1 to 5 kg. Cylinder 7 is heated under pressure at 130 ° C for 90 minutes while pressure is fed at a pressure of / cm ^2.
Is thermally cured (see FIG. 4).

Since the cylindrical body 7 is pressed from the inside to the outside by the compressed air, the molded product is molded to have the same outer diameter as that of the molding groove 8 and a clean outer peripheral surface conforming to the surface of the molding groove 8 is formed. It becomes a curved pipe having.

Subsequently, after cooling, the mold is removed (see FIG. 5), and an appropriate finishing process is performed to finish the stock for sliding down.

[0032]

As described above, the present invention has the following effects.

Since the curved part and the smoothness of the surface are formed by the molding split mold, unlike the conventional method of forming the pipe material and then bending the pipe material, the molding is performed once, and the mass productivity is improved accordingly.

The rigidity is increased by about 1.5 times as compared with a pole made of metal such as aluminum.

Since the rigidity is higher than that of metal,
The outer diameter can be reduced, and a stock with low wind pressure resistance can be created.

Compared with conventional products such as aluminum, the rigidity is high and the density is low, so that a lightweight stock can be produced.

Since the unidirectionally aligned inorganic fibers are arranged, the rigidity in the longitudinal direction essential for the stock can be set higher than that of the conventional product.

Since it is made of FRP, the divided pieces do not scatter when it is broken like a conventional product. Since it is a method of pumping gas from the inside after filling in the molding die, the outer peripheral surface of the cylinder is pressed against the molding groove of the molding split mold, and the outer peripheral surface of the molded product has a shape matching the surface of the molding groove. In addition, even if the outer diameter of the tubular body is slightly smaller than the diameter of the molding groove, the molded product can be molded to the dimensions of the molding groove without any problem.

As for the finish of the molded product, it suffices to finish the seam of the molding split mold, and the external finish is not necessary.
Also in this respect, mass productivity is improved.

[Brief description of drawings]

FIG. 1 is an explanatory plan view of the present embodiment.

FIG. 2 is an explanatory sectional view of the present embodiment.

FIG. 3 is an explanatory view of a split mold according to this embodiment.

FIG. 4 is an explanatory sectional view of the present embodiment.

FIG. 5 is a perspective view of a molded product molded according to the present invention.

FIG. 6 is a sectional view of the above.

[Explanation of symbols]

 1 Thin Core Material 2 Tubular Body 3 Rolled Body 4 Base Material 5 Inorganic Fiber 6 Rolled Sheet 7 Cylindrical Body 8 Molding Groove 9 Mold Split Mold

Claims (2)

[Claims] 1. A thin tubular material is fitted with a flexible tubular body to form a wound body, and the inorganic fibers are arranged in one direction on a base material made of the inorganic fibers. Together with the resin, the inorganic fibers are fixed to a base material to form a wound sheet, and the wound body is arranged at one end edge of the wound sheet in parallel with the direction of the inorganic fibers and covered by the wound body. A wound sheet is wound, and after winding, the thin core material is pulled out to form a tubular body, and a molding split die in which a molding groove having a desired shape is formed on the molding surface is formed, and one end of the tubular body is closed to mold. FRP sliding stock, characterized in that after the cylinder is press-fitted into the groove, the molding split mold is closed, the molding split mold is heated and pressed while feeding gas into the pipe body, and after cooling, demolding is performed and finish processing is performed. How to make a pole. 2. An FRP stocking pole for downhill, which is manufactured by the manufacturing method according to claim 1.