JPS6342816A - Method of fin - Google Patents

Abstract

PURPOSE:To prepare a tough fin simply and uniformly, by wrapping the outer side of a foam with glass fibers, compressing the whole outer side of the glass fibers with a mold for molding the fin, pouring a resin into the glass fibers through a pipe penetrating the mold and hardening the resin. CONSTITUTION:Whole the outer side circumference of a foam l is wrapped with glass fibers 3 in a mold 4 and the glass fiber 3 is compressed by clamping the mold 4 to form an outer shape of a fin 1 on the outer surface of the glass fiber 3. On the other hand, a resin 2 is poured into the inside of the mold 4 through a pipe 5 penetrating the mold 4 and the fin is formed by filling the resin 2 into the glass fibers 3 and hardening the resin. In this case, the process for clamping the mold to form the outer shape of the fin and the process for pouring the resin can be carried out simultaneously, but if the hardening of the resin goes very fast, it is a safer way that the molding process is carried out at first and the pouring process thereafter.

Description

DETAILED DESCRIPTION OF THE INVENTION (Object of the Invention) The present invention relates to a method for manufacturing a fin that protrudes from the bottom of a surfing or yacht and serves to stabilize the body of a surfing or yacht floating on the water surface.

Conventionally, as a method for manufacturing such fins, the first (a)
), (b) As shown in the figure, after the resin 2 is laminated on the inner surface of the mold, the foam 1 is compressed from both sides of the mold 4, and the laminated resin 2 is attached to the foam 1, which is the so-called hand lay-up. Construction method or as shown in Figure 2 (a) and (b),
An oven molding method or the like has been used in which a layer of resin 2 is manually formed from the outer surface of the form 1.

However, in the hand lay-up method, forming the surface of the resin 2 by laminating the surface of the resin 2 so as to match the outside surface of the form 1 on the inside surface of the metal fitting 4 as shown in FIG.
This type of lamination required a considerable amount of skill and a considerable amount of time.

In the open mold construction method shown in Figures 2(a) and 2(b), the work of laminating resin on the outside of the foam is performed in the first step (a).
), (b) Compared to the case shown in the figure, forming the form by hand does not necessarily require as much skill as the case shown in the figure.
Since the outside of the wafer is laminated with resin, it is extremely difficult to produce a uniform product in large quantities.

The present invention aims to overcome these drawbacks in conventional fin manufacturing methods.

(Structure of the Invention) The structure of the present invention is as follows: (1) After the outer periphery of the foam is wrapped with glass fiber, the entire outer surface of the glass iam is compressed by a mold for molding fins, and then the mold (2) The outer surface of the glass fiber is compressed by a mold for forming fins, and the glass m The fin is formed by roughly injecting resin and solidifying it.

That is, in the method of the first invention of the present application, the entire outer periphery of the foam is wrapped in glass fiber inside the mold 4 as shown in FIG. 3(a), and then the foam is wrapped in glass fiber as shown in FIG. First, the outer shape of the fin l is molded on the outer surface of the glass fiber by tightening the mold 4 and compressing the glass fiber, and on the other hand, the resin 2 is injected into the inside of the mold 4 through a vibrator 5 passing through the mold 4. The fins are formed by injecting the resin 2 into the glass fibers 3 using capillary action and hardening the resin 2 between the glass fibers 3.

In the method of the second invention of the present application, as shown in FIG. 4(a), the glass 1a fiber 3 is placed inside the mold 4, and the mold 4 is tightened as shown in FIG. 4(b). By compressing the fibers, the outer surface of the glass 1a fiber 3 molds the outer shape of the fin on the outer surface of the fin, and on the other hand, through the pipe 5 passing through the mold 4, the resin 3 is inserted into the inside of the mold 4. The fins are formed by filling and curing.

That is, the first invention is a method of molding a fin with a foam inside, and the second invention is a method of molding a fin without a foam inside.

Also, in Figures 3(b) and 4(b), the step of tightening the mold to mold the outer shape of the fin and the step of injecting the resin may be performed at the same time, but if the resin hardens quickly. It is safer to perform the molding process first and then the injection process.

The resin 2 to be injected may be either a thermosetting resin or a thermoreversible resin, and the glass fiber #13 used may be a string-like material (yarn or roving) made by lightly combining bundles of filaments, or a string. There are two types of strands: chopped strands that are cut into appropriate lengths, and sheets that are made by stacking chopped strands in an arbitrary direction, and any shape can be used. In this case, chopped strands made of glass ram cut into appropriate lengths are most suitable for use.

As described above, the present invention is characterized in that the glass la fiber is used as a reinforcing material for plastic, and the shape of the fin is determined in advance by the glass mta, and molding is performed.

(Effects of the invention) In the present invention, it is not necessary to layer resin as in the conventional hand lay-up method or oven mold method, and the mold is simply compressed after surrounding the entire periphery of the foam with a glass jam. Then, as long as the fins can be obtained, it becomes possible to form the fins without requiring any skill.

In addition, since a uniform shape can be formed using a mold, there is no possibility of non-uniformity as in the conventional oven molding method.

Furthermore, since the resin is reinforced with glass fiber, a fin made of an extremely strong material can be obtained, and the fin can be protected from breakage, and it can also have sufficient strength even without providing a form inside as shown in the second invention. It is possible to obtain fins having:

As described above, according to the present invention, strong fins can be easily and uniformly manufactured, which is extremely convenient.

[Brief explanation of drawings]

Figure 1(a), Figure 1(b): Cross-sectional view showing the conventional hand lay-up method. Figure 12(a), Figure 2(b): Cross-sectional view showing the conventional oven mold method. 4(a), 4(b): A sectional view showing the fin manufacturing method of the second invention. 1. Form 2φ resin 3. Glass #a fiber 4. Mold
5. Naoto Akao, attorney-at-law and patent attorney representing pipe applicant No. 1 (a)
Figure 1(b) Figure 2(a) Figure 2(b) Box

Claims (2)

[Claims] (1) After wrapping the entire outside of the foam with glass fiber, the outer surface of the glass fiber is compressed using a mold for forming fins, and resin is injected into the glass fiber using a pipe that passes through the mold. A method of forming fins by solidifying (2) A method for molding fins by compressing the outer surface of glass fibers using a mold for molding fins, and injecting resin into the glass fibers through a pipe passing through the mold and solidifying the resin.