JP3280754B2 - Manufacturing method of fiber reinforced plastic blower blade - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a fiber reinforced plastic (hereinafter referred to as "FRP") blower blade, and more particularly to a method of manufacturing a large blower blade which has a light weight and a large reinforcing effect. The present invention relates to a method for manufacturing a fiber-reinforced plastic blower blade at a reduced cost.

[0002]

2. Description of the Related Art Conventionally, FRP blower blades are:
A chopped strand mat is attached to the surface of a hollow body such as an airbag or a core material such as urethane foam by the hand lay-up method, and the abutment between the periphery of the lower surface and the periphery of the upper surface that is the outer shell of the wing Has been finished by bonding or FRP bonding and formed into a hollow shape, or a solid FRP solid article has been formed by an IR method (resin injection method).

[0003] However, the former hollow type has a problem that it takes time and effort to finish the joints and requires high skill, so that the cost is high, and the latter solid type is easy to mold. However, since the weight of the wing is large, there is a problem that the power load is large in a practical stage, especially for a large wing, and the manufacturing cost is high, which is not suitable for inconvenience.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a method for manufacturing a blower blade for solving the above-mentioned problems, the gist of which is as follows.
In the method of molding a blower blade from fiber-reinforced plastic, a lower surface of a preform is placed in a lower cavity of a split mold, and then a hollow body or a lightweight core material is set thereon, and then the upper surface is pressed. Cover with the upper body of the reform,
A method of manufacturing a fiber-reinforced plastic blower blade, comprising closing an upper mold, injecting a thermosetting plastic into a mold, curing the same, and integrally bonding and joining abutting peripheral portions of the upper and lower face members of the preform. It is.

[0005] The preform used in the present invention is one in which the fibers of the reinforcing glass fiber mat are adhered to each other with a thermoplastic binder resin and are preformed into the lower surface shape or upper surface shape of the blade.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a sectional view showing a first step of the present invention, FIG. 2 is a sectional view showing a second step of the present invention, FIG. 3 is a sectional view showing a final step of the present invention, and FIG. An example of a contact peripheral portion between preforms is shown in an enlarged sectional view.

An embodiment of the present invention will be described in the order of steps with reference to the sectional views of FIGS. 1 to 3. First, as shown in FIG. 1, a rising die is formed in a cavity A-11 of a lower mold A-1 of a split mold. The preform lower surface body 1 in which the contact part 11 is formed thick is placed,
Next, as shown in FIG. 2, after setting a lightweight core material 3 made of urethane foam resin or the like on the preform lower body 1, the upper surface thereof is covered with the preform upper body 2, and the preform lower body 1 rises. The contact portions 11 and the rising contact portions 21 of the preform upper body 2 and the flat contact portions 12 of the preform lower body 1 and the flat contact portions 22 of the preform upper body 2 abut each other, and then FIG. As shown in the figure, the upper mold A-2 provided with the resin injection port B is closed, the thermosetting plastic 4 is injected from the resin injection port B, and each contact portion of the preform lower body 1 and the preform upper body 2 is contacted. 11 and 2
After the thermosetting plastic is spread between 1 and 12 and 22, it is cured to complete the molding of the blower blade.

In the above embodiment, the case where the lightweight core material 3 such as urethane foam is used is shown. However, a hollow body such as an airbag may be used. The lightweight core material and the hollow body 3 are sealed in the wing of the molded body without being extracted after molding.

In the above embodiment, the abutting portions of the rising contact portions 11 and 21 which are preformed thick and thick in the contact peripheral portions of the preform lower body 1 and the preform upper body 2 are injected. Although the case of adhesive bonding with the thermosetting plastic 4 is shown, it is not restricted to this, and for example, FIG.
As shown in the enlarged cross-sectional view of FIG. 5, the rising contact portion 21 is bent inward to come into contact with the rising contact portion 11 so as to have an overlapping thickness, and at the same time, the contact area for bonding is increased. It can have a reinforcing effect.

[0010]

Since the present invention has the above-described structure, the following effects can be obtained. That is, according to the present invention, an excellent fiber reinforced plastic blower blade can be obtained in which the manufacturing cost of a particularly large blower blade is reduced and the weight thereof is achieved, and a portion where the blade is easily damaged is greatly reinforced.

[Brief description of the drawings]

FIG. 1 shows a first step of the present invention in a sectional view.

FIG. 2 is a sectional view showing a second step of the present invention.

FIG. 3 is a sectional view showing a final step of the present invention.

FIG. 4 is an enlarged cross-sectional view illustrating an example of a contact peripheral portion between preforms according to the present invention.

[Explanation of symbols]

 Reference Signs List A-1 Lower die A-2 Upper die 1 Preform lower surface body 11 Rise contact part 12 Flat contact part 2 Preform upper body 21 Rise contact part 22 Flat contact part 3 Light weight core material 4 Thermosetting plastic

Claims (1)

(57) [Claims] In a method of molding a blower blade from fiber-reinforced plastic, a lower surface of a preform is placed in a lower mold cavity of a split mold, and then a hollow body or a lightweight core material is set thereon. The upper surface is covered with a preform upper body, the upper mold is closed, a thermosetting plastic is injected into the mold, and the resin is cured, and the contact peripheral edges of the upper and lower preforms are integrally bonded to each other. Characteristic method of manufacturing fiber reinforced plastic blower blades.