JPH09314683A - Molding of product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and accurately produce a product having inner and outer parts so as to have a good shape and a good dimension. SOLUTION: In molding a product having an inner part 1 forming an inside structure part and an outer part 9 forming an outside structure part, at first, the inner part 1 is molded and a temporary molded object 7 is formed to the outside of the molded inner part 1 so as to be fitted to the inner surface shape of the outer part 9 and, subsequently, this temporary molded object 7 is used as a guide to integrally form the outer part 9 along with the inner part 1 and, thereafter, the temporary molded object 7 is removed from the space between the inner and outer parts 1, 9.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for molding a product, and more particularly to a method for molding an FRP product.

[0002]

2. Description of the Related Art For example, in the case of molding a FRP product having a screw-shaped internal component and a cylindrical external component integrally formed to cover the screw-shaped internal component, conventionally, an internal FRP product is Make molds and wooden molds for parts and external parts, and make FRP internal parts and external parts separately,
The internal parts are fitted into the external parts, and the internal parts and the external parts are integrally assembled by a method such as bonding or screwing. Alternatively, a structure in which internal parts and external parts are integrated is molded by hand one by one.

[0003]

However, it is difficult to mold such an internal part and an external part, and in particular, as described above, a screw-shaped part is provided inside and a cylindrical part is provided outside. The product is very difficult to mold. Further, in the case of molding by hand, there is a problem that the shape is apt to be rough and the dimensional accuracy is poor.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve such a problem and to make a product having an internal part and an external part efficiently and accurately in shape and size. .

[0005]

In order to achieve this object, the present invention, when molding a product having an inner part forming an inner structure part and an outer part forming an outer structure part, first molding the inner part, On the outside of this molded internal part, a temporary molded body is formed so as to match the inner surface shape of the external part, and then the temporary molded body is used as a guide to form the external part integrally with the internal part, and then The temporary molded body is removed from between the internal part and the external part.

In this way, after molding the internal part, a temporary molded body is formed on the outside thereof so as to match the inner surface shape of the external part, and then the external component is formed by using this temporary molded body as a guide. Therefore, the external component can be easily molded, and the internal component and the external component can be easily integrated. In addition, since the material itself is not integrated by adhesion or screwing, a product excellent in strength can be manufactured. Then, after that, the temporary molded body is removed from between the internal component and the external component, so that the final product without the temporary molded body can be obtained.

If the temporary molded body is made of a material that can be eluted between the internal component and the external component after the external component is formed,
The removal work is particularly easy. As such a material, a material that can be eluted by heating, such as wax, or a material that can be eluted by water, such as sand using salt as a binder, can be preferably used.

When the internal parts and the external parts are molded with the FRP material, if fine irregularities are formed on the surface of the internal parts in the part where the internal parts and the external parts are integrated, they are integrated. Can be well combined.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. Here, the internal component forming the internal structure is a screw-shaped member, and the external component forming the external structure is a cylindrical member that covers the internal component, and these are integrally molded with FRP material as an example. explain.

First, as shown in FIG.
Mold with RP material. The internal member 1 has a screw blade 3 integrally formed around a central axis 2. In this case, a usual molding method, hand layup method, or the like is applied. At this time, if a basic shape is formed with an iron plate or the like and FRP is laminated on it, molding of the member is easy.

Next, as shown in FIG. 2, a temporary molding die 4 is formed around the inner member 1. This temporary molding die 4 has a cylindrical member 5 that contacts the peripheral edge of the screw blade 3, and a bottom member 6 that closes one end of the cylindrical member 5. This temporary mold 4 may be formed by externally fitting a cylindrical member 5 around the inner member 1 and then connecting a bottom member 6 to one end of the cylindrical member 5. Alternatively, the inner member 1 may be formed by inserting the inner member 1 into an integrally molded bottom member 6.

After the temporary molding die 4 is formed in this way, the material for forming the temporary molding is filled therein by pouring or the like. As the material, as described above, a material that can be eluted by heating, such as wax, or a material that can be eluted by water, such as sand using salt as a binder, can be preferably used. . Then, by solidifying this material in the temporary molding die 4, the temporary molded body 7 is formed around the inner member 1 as shown in the drawing. The temporary molded body 7 has a cylindrical shape corresponding to the inner surface shape of the molding die 4.

After that, as shown in FIG. 3, the temporary molding die 4 is removed, and the outer peripheral surface of the temporary molded body 7 is processed according to the inner surface shape of the external member. Here, the outer peripheral portion of the temporary molded body 7 is processed and removed so that the peripheral edge portion 8 of the screw blade 3 slightly projects from the outer periphery of the temporary molded body 7.

When the temporary molded body 7 has been processed in this way, then, as shown in FIG. 4, the outer member 9 is molded around the outer member 9 with an FRP material. In that case, the external member 9 can be molded by an appropriate method such as a winding method or a hand layup method. At this time, as described above, by projecting the peripheral edge portion 8 of the screw blade 3 and embedding the peripheral edge portion 8 in the inner peripheral portion of the outer member 9, the inner member 1 and the outer member 9 are securely formed. Can be integrated into. Further, if fine concavities and convexities are formed on the portion of the inner member 1 that is integrally joined with the outer member 9, that is, on the surface of the peripheral edge portion 8 of the screw blade 3, the joining for the integration is better performed. be able to.

Once the outer member 9 has been molded, the molded FRP product is then heat cured. At that time, if the temporary molded body 7 is formed of wax, the wax is melted by this heating and poured out to the outside. If the temporary molded body 7 is made of a material that dissolves in water, F
After curing the RP, the material used for the temporary molded body 7 is poured out with water. FIG. 5 shows a cross section of the final product thus obtained.

In this way, it becomes possible to easily mold a product in which a screw-shaped member is integrally provided inside a cylindrical member, which has been difficult to manufacture by the conventional FRP molding method. Then, unlike the conventional one in which the screw-shaped inner member and the cylindrical outer member are separately molded and then fitted later, the screw-shaped inner member 1
Since the cylindrical outer member 9 can be directly molded on the outer circumference of the inner member 1, the inner member 1 and the outer member 9 can be reliably integrated.

In the above description, the internal component 1 is a screw-shaped member and the external component 9 is a cylindrical member that covers the internal component 1. However, the present invention is not limited to this. is not. Further, in the above description, the case where the inner member 1 and the outer member 9 are molded with the FRP material has been described, but the present invention is not limited to this, and includes the case of molding with other materials.

[0018]

As described above, according to the present invention, a temporary molded body is formed on the outside of the molded internal component so as to match the inner surface shape of the external component, and then this temporary molded body is used as a guide. Since the external part is formed integrally with the internal part and then the temporary molded body is removed from between the internal part and the external part, the external part can be easily molded and the internal part and the external part can be integrated. It can be done easily. In addition, since the material itself is not integrated by adhesion or screwing, a product excellent in strength can be manufactured. Then, after that, the temporary molded body is removed from between the internal component and the external component, so that the final product without the temporary molded body can be obtained.

Further, according to the present invention, if the temporary molded body is made of a material that can be eluted between the internal component and the external component after the external component is formed, the removing work can be performed particularly easily. .

[Brief description of drawings]

FIG. 1 is a diagram for explaining a product molding method according to the present invention.

FIG. 2 is a diagram for explaining the next stage of FIG.

FIG. 3 is a diagram for explaining a next step of FIG.

FIG. 4 is a diagram for explaining the next stage of FIG.

FIG. 5 is a diagram for explaining the next stage of FIG.

[Explanation of symbols]

 1 Internal member 7 Temporary molded body 9 External member

Claims (2)

[Claims] 1. When molding a product having an inner part forming an inner structure part and an outer part forming an outer structure part, first, the inner part is molded, and the outer side of the molded inner part,
Form a temporary molded body to match the inner surface shape of the external part,
Next, a molding method for a product, characterized in that the temporary molded body is integrally formed with the internal component by using the temporary molded body as a guide, and then the temporary molded body is removed from between the internal component and the external component. 2. The method for molding a product according to claim 1, wherein the temporary molded body is formed of a material that can be eluted from between the internal component and the external component after the external component is formed.