JPS58165501A - Manufacture of moving blade in axial flow rotary machine - Google Patents

Abstract

PURPOSE:To both easily manufacture the captioned rotary blade and increase strength without cutting of a reinforced fiber, by laminating plural prepreg sheets, incorporating a wedge to a base end part of the sheets to compressively mold the sheets and performing machine work after the sheets are hardened. CONSTITUTION:A reinforced plastic prepreg sheet 1 reinforced in one direction is formed to a rectangular shape and laminated to a prescribed number of sheets to obtain a laminated prepreg 2. While an external mold 3 and internal mold 4 having the same curved surface as the camber surface of a product and a triangular sectional wedge 5 in length W are prepared. Then the prepreg 2 is interposed between the both molds 3, 4 after the wedge 5 is interposed to the base end part of the sheet, retainer plates 5 are arranged to four sides, and the prepreg is housed in an autoclave and heated. In this way, the prepreg 2 is compressively molded, after being hardened, the molds 3, 4 are removed to obtain a half-finished product 7. And then this product 7 is finished by a machine tool to prescribed dimensions to obtain a desired product 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing trickle rotary machine blades from reinforced plastic.

Compression molding has been developed as a method for manufacturing the rotor blades of axial-flow rotating machines, such as the engines of ship and chain aircraft, using reinforced plastics such as 9-epoxy resin reinforced with carbon fiber #A''/nide. This manufacturing method involves stacking multiple large and small pieces of reinforced plastic Griple to form a moving blade, then heating and compression molding the pieces between IIK, which has the same shape as the blade surface.

However, in traditional manufacturing methods such as
Although it is possible to form an airfoil in which the camber surface can be developed into a flat surface, it is difficult to develop the camber surface into a flat surface.
It takes 1kvh to mold something with an airfoil shape like this.

Therefore, a method was proposed by British Patent No. 1536899 to manufacture rotor blades having an arbitrary OjI shape, also by compression molding - this was done by forming a strip of Kudu SO prepreg or a Kuta SO prepreg or a Kuta Kuhiro fiber bundle into a This is a method in which the prepregs are laminated in the same shape as the airfoil and then compression molded, but a large number of prepregs are cut into strips, which are piled up into irregularly shaped sheets. However, the disadvantage is that the number of man-hours required for one operation is enormous, and the manufacturing cost increases.

In view of the above points, a round prepreg sheet is made by laminating multiple prepreg sheets so that it has a length, width, and thickness that are approximately the same as the finished dimensions of the wing. (By inserting rust, compression molding, and then curing and machining, it is strong with fewer man-hours and the fibers will not be cut.)

The purpose of this invention is to provide a method for manufacturing rotor blades using round shaft/flow rotary rotary blades.Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings.

Figures 1 and 6 are perspective views of semi-finished products and finished products in a rounded 6-work 1iK, and a perspective view, a plan view, and a cross-sectional view of the rotary rotor blades according to the present invention. Figure 1 is a perspective view of the laminated prepreg, Figure 2 is a perspective view of the molding lug, Figure 3 is a plan view of the mold during compression molding, Figure 4 is a sectional view of the mold in Figure 3, and Figure 5 is a perspective view of the laminated prepreg. The figure is a perspective view of a compression-molded semi-finished product, and FIG. 6 is a perspective view of a finished product. Therefore, to explain the manufacturing method according to the present invention using these figures, first, epoxy resin, unsaturated polyester resin,
Polyimide resin, carbon fiber and glass fiber.

i' A reinforced plastic prepreg sheet reinforced with Kevlar fiber or the like in one direction is formed into a rectangular shape and laminated. Note that the fiber #1 of each prepreg is oriented in a predetermined direction. At this time, the length, width W, and thickness T of the laminated prepreg 20 are set to approximately the same dimensions as the different lengths including the fixed part of the product, the maximum camber line length, and the wing base thickness excluding the fixed part. do. At this time, the two laminated prepregs were not cured. On the other hand, as shown in Fig. 2, there is a male mold 3 and a female mold 4 having the same curved surface as the camber surface of the product, and a wedge S having a triangular cross section and a length W as shown in Fig. 4.
Prepare one or more. The size of the mold is designed so that the thickness of the wing portion after compression molding is K, which is the same as the thickness of the laminated prepreg 2. Then, as shown in FIGS. 3 and 4, a laminated prepreg 2
The proximal end K<of the mold 2 is inserted, and the four sides are held by the holding plates S so that the gap in the mold is completely filled. At this time, if necessary, in order to make it conform to the mold, add layers:
'1: Heat Repreg 2 to a temperature that will give it the appropriate softness.

This is compression-molded by heating it at a temperature of, for example, 130 to 250 degrees Celsius, corresponding to the curing temperature of the resin, while pressurizing it in an autoclave, and after curing, it is removed from the mold.

Figure 5 shows the semi-finished product taken out from the pot.The wing part of the semi-finished product T is laminated parallel to the camber surface, and the trench runs from the tip to the base, making it the same thickness as the base. Furthermore, the fixing portion 7aa is expanded by 9 minutes with the insertion of the rust S. Then, this semi-finished product 1 is finished processed to a predetermined size using a machine tool, thereby obtaining a product 8 shown in FIG. 6. 7th
Figure 8 and Figure 8 show when installing rotor blades on the μ-ta of an axial flow rotary machine! 7 shows a perspective view of the female member, and 880 shows a perspective view of the male member. Therefore, the fixing part 81 of the product 8 is held between the circular arc surfaces of the female member 9 and the male member 10, and the outer peripheral surface is fitted into the four-way groove to hold the product 8 on the rotor.

In the above-mentioned manufacturing method, the mold size of the semi-finished product is designed so that the thickness of the wing part is the same as that of the laminated prepreg 2, so even if the semi-finished product is machined, In the plane parallel to the camber plane, there are no holes where reinforcing fibers are cut, and strength can be ensured. In addition, when laminating the prepreg sheets 1, it is preferable to interpose prepreg sheets with different orientation angles in one fiber direction.
m-character can be imparted.

That’s it for O11! As is clear, according to the present invention, in the method for manufacturing an axis-R rotary rotor blade, a plurality of prepreg sheets are prepared by preparing a plurality of prepreg sheets with a length of 9 width, which is approximately the same as the finished dimension of the blade.
By stacking the prepreg sheets so that they are thick and forming the proximal end K by inserting a rust, compression molding, curing, and machining, it is possible to simply laminate the flat prepreg sheets and not roll the laminate. The number of man-hours is extremely small, and even if machining is performed, the number of man-hours can be reduced overall, which reduces manufacturing costs.Also, since the reinforcing fibers are not cut during machining, strength is ensured.
It is possible to manufacture rotor blades with high strength.

[Brief explanation of drawings]

1 to 8 show perspective views of semi-finished products and products in each process for explaining the method of manufacturing an axial rotary rotor blade according to the present invention, and FIG. 1 is a perspective view of a laminated prepreg; Figure 2 is a perspective view of the mold, Figure 3 is a plan view of the mold during compression molding, Figure 4 is a sectional view taken along line AA in Figure 3, Figure 5 is a perspective view of the compression molded semi-finished product, and Figure 5 is a perspective view of the compression molded semi-finished product. FIG. 6 is a perspective view of the finished product, FIG. 7 is a perspective view of the female member for supporting the fixing part, and FIG. 8 is a perspective view of the male member for supporting the fixing part. 1-...O prepreg sheet, 2-Male type, 4φ...Female chick, 5...Wedge, L @"...Length, W@Φ-・Width, T...e, Thickness. Patent applicant Mitsui Engineering & Shipbuilding Co., Ltd. Agent Masaki Yamakawa (and 1 other person) Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A plurality of prepreg sheets are laminated so that the maximum camber length, the blade length, and the blade base thickness are approximately the same in width and 1° in thickness, and at the base end (with a wedge-shaped member inserted,
A method for manufacturing an axial flow rotating machine blade, which comprises sandwiching the laminated prepreg sheet between a pair of molds having the same curvature as the camber and surface, compression-molding the sheet, curing it after nine months, and finishing it with a machine.