JP2866716B2 - Manufacturing method of fiber reinforced plastic fan - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of manufacturing a fiber reinforced plastic (hereinafter, referred to as “FRP”) fan, and more particularly, to the appearance quality and blowing characteristics of a wing having a three-dimensional curved surface. The present invention relates to a method of manufacturing an FRP fan with an improved performance.

[Prior art and its problems] Conventional FRP fans are often used due to their light weight and superior corrosion resistance compared to metal fans.
When molding the fan, a lightweight core material such as a foamed polyurethane plate or polyester fiber non-woven fabric is laminated and placed between the reinforcing fiber materials constituting the outer shell of the wing body in the cavity of the molding die. Liquid thermosetting plastic is injected into the cavity and the whole is hardened.However, the thermosetting plastic does not spread to the step formed between the overlapping core materials, and the trapped air remains as bubbles. In addition, there is a problem that not only the appearance of the fan is impaired but also the quality is deteriorated due to the occurrence of a cutout or a depression on the surface, and the required air blowing characteristics cannot be obtained.

Means for Solving the Problems The present invention is a method for manufacturing an FRP fan for solving the above-mentioned problems, and the gist of the present invention is a fiber in which a wing body and a mounting shaft supporting the wing body are integrated. In manufacturing a reinforced plastic fan, a reinforcing fiber material is laid all over the lower mold cavity of the upper and lower split molding dies, and the wall thickness is gradually increased in the mounting axial direction on the wing body forming portion of the laid reinforcing fiber material. A plurality of lightweight cores are superimposed on each other, and a thermosetting plastic composition is applied to a step portion formed between the superimposed cores in a direction toward the tip of the wing body to form a flat inclined surface. A fiber reinforced plastic fan characterized by covering the entire surface from the body to the mounting shaft with a reinforcing fiber material similar to the above, closing the upper mold, injecting a liquid thermosetting plastic into the cavity on the mounting shaft side, and curing the liquid. It is a manufacturing method of.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

1 (a) to 1 (d) show the present invention in a sectional view in the order of steps, and FIG. 2 shows the FRP fan of FIG. 1 (d) in a plan view seen in the direction of arrows II-II.

As shown in the cross-sectional view of FIG. 1 (a), a long fiber glass mat is formed in the cavity B of the lower die A of the upper and lower split molds from the wing body 1 forming portion to the mounting shaft 2 forming portion. A reinforcing fiber material 11 such as glass or roving is spread over the wing body 1 forming portion of the reinforcing fiber material 11 in the direction of the mounting shaft 2 forming portion, as shown in FIG. A light-weight core material 3 such as a foamed polyurethane sheet or a nonwoven fabric of polyester fiber is overlapped so that
The uncured liquid thermosetting plastic or a composition obtained by dispersing chopped strands in the liquid thermosetting plastic and increasing the viscosity at the step 3 ′ generated in the tip direction (left direction in the figure) of the wing body 1 between The object 4 is applied to form a flat inclined surface, and thereafter, as shown in FIG. 1 (c), a reinforcing fiber material 11 similar to that of FIG. The uncured liquid thermosetting plastic is press-fitted in the direction of the arrow from the injection port C which covers the entire surface over the forming portion 2 and which communicates with the cavity B of the mounting shaft 2 forming portion of the upper mold A '. After surrounding the core material 3 of the forming portion and penetrating the reinforcing fiber material 11 filled in the mounting shaft 2 forming portion, the thermosetting plastic is hardened by heating at room temperature or slightly, and then the mold is opened. Then, the FRP fan shown in FIG. 1 is obtained.

A thermosetting plastic press-fitted from an injection port C provided on the mounting shaft 2 side of the molding die is provided in a step portion 3 'formed in the tip direction of the wing body 1 between the lightweight core members 3 overlapped in the present invention. Since it is difficult to spread and forms a blind spot that embraces air, the thermosetting plastic composition 4
It is important that a flat surface is formed by applying a liquid.

In addition, since the step portion 3 ″ formed in the direction of the end of the wing body 1 between the overlapping core members 3 is easily filled with the thermosetting plastic from the mounting shaft 2 direction, the above-described composition is applied in advance. It is not necessary to form it on a flat surface.

[Effects of the Invention] The present invention has the above-described configuration, and thus has the following effects.

That is, according to the present invention, the light-weight core material wrapped in the reinforcing fiber material in the fan blade body is laminated so as to be sequentially thicker in the mounting axial direction, and in the blade tip direction between the laminated core materials. The resulting step is filled with a thermosetting plastic composition before the molding die is clamped to form a flat inclined surface,
Since the thermosetting plastic is injected under this condition, there is no blind spot where the thermosetting plastic does not permeate, and therefore, it has excellent appearance with no air bubbles and depressions and required airflow characteristics. FRP fan is obtained.

[Brief description of the drawings]

1 (a) to 1 (d) show the present invention in a sectional view in the order of steps, and FIG. 2 shows the FRP fan of FIG. 1 (d) in a plan view seen in the direction of arrows II-II. 1 ... wing body, 11 ... reinforcing fiber material, 2 ... mounting shaft, 3 ...
... Light weight core material, 4 ... Composition, A ... Lower mold, A '... Upper mold B ... Cavity, C ... Injection port

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F04D 29/18-29/38

Claims (1)

(57) [Claims] When manufacturing a fiber reinforced plastic fan in which a wing body and a mounting shaft for supporting the wing body are integrated, a reinforcing fiber material is laid over the entire lower mold cavity of an upper and lower split molding die, and the laying is performed. On the wing body forming portion of the reinforcing fiber material, a plurality of lightweight core materials are superimposed so as to become sequentially thicker in the mounting axial direction, and a step formed in the wing body tip direction between the superposed core materials is formed. After applying a thermosetting plastic composition to form a flat inclined surface, cover the entire surface from the wing body to the mounting shaft with a reinforcing fiber material similar to the above, close the upper mold, and set the inside of the cavity on the mounting shaft side. A method for producing a fiber reinforced plastic fan, comprising: injecting a liquid thermosetting plastic into a liquid;