JPH0767755B2 - Rotational FRP molding method for long hollow products - Google Patents

Description

TECHNICAL FIELD The present invention relates to an FRP molding method for a hollow long product having different shapes and dimensions at the tip and the root of a main girder or the like of a large-scale wind turbine blade for power generation.

(Prior Art) Conventionally, as an FRP molding method for a hollow long product having different shapes and dimensions at the tip and the root, such as the main girder of a wind turbine blade, the following process is performed when explaining the case of a wind turbine blade. It was

First, a long and thin metal mold (30) having a thick cylindrical shape or a flat cylindrical shape at the base and becoming thinner and flatter toward the tip is left still on a workbench or a work platform so that it is substantially horizontal. Then, first, a glass mat or roving cloth (31) cut into one surface (total length × half circumference) is placed on the upper surface of the mold, and a resin containing a curing agent is impregnated into this to defoam.
This work is called lamination, but the number of plies that can be laminated at one time is limited to 10 to 15 plies under curing conditions.

After stacking with the number of plies within this range, it is cured naturally or by heating. After the upper surface is cured, it is turned upside down so that the lower surface becomes the upper surface, and similarly laminated and cured. This was repeated once or multiple times to obtain a thick wall. (See Figure 15).

Further, as shown in FIG. 16, the conventional mold releasing method is to fix the die at the base to the fixed object (32) with a bond or the like, and wrap the wire rope (33) around the outer surface of the product at the tip to tip the tip. It was pulled out to the side and released.

(Problems to be Solved by the Invention) This conventional FRP molding method has the following problems.

This FRP molding method has many manual steps and is inefficient in working efficiency.

Since the molding is performed by laminating separately on one surface, the overlapping portion (34) must be molded so as to have a thickness equal to the thickness of the other portion, which requires a great deal of time and labor. (See FIG. 14) Also, the strength of the overlapping portion (34) is reduced.

As shown in FIG. 9, since the mold was supported at two points on both sides, the portion near the tip with a small moment of inertia of section was largely displaced downward, and therefore intermediate support must be provided. If the intermediate support is provided, the left side of the intermediate support member,
It has to be molded separately from the right side, the number of steps increases further, labor,
It was time consuming.

Moreover, the problem of the left and right joints remains as above.

Furthermore, in the mold release method of this FRP molding method, since the outer surface of the product is pressed by the wire rope (33) and pressed against the mold (30), a large force is required for pulling out, which is a time-consuming work. It was

(Means for Solving Problems) The present invention is intended to provide a rotary FRP molding method for a hollow long product having a new concept that solves the conventional problems, the gist of which is the diameter at the tip and the root. A long taper die of different length is horizontally mounted on the bearings arranged on both ends of the die, and another bearing is provided at the end of the die on the base side with high rigidity. By holding a required lifting load or pressing load on the bearing, the long tapered metal mold is held substantially horizontal, and while the above-mentioned substantially horizontal long tapered metal mold is slowly rotated, the resin containing the curing agent is applied. The impregnated cloth tape is spirally wound on a long taper mold, and the cross tape wound in a cylindrical shape on the taper mold is cured and then released from the taper mold to produce an FRP tapered hollow long product. FRP molding of hollow long products featuring Law.

2) A long taper die having different diameters at the tip and the root is horizontally mounted by bearings arranged at both ends, and another bearing is provided at the end of the die on the root side having high rigidity. By holding the required lifting load or pushing down load on two or more bearings on the root side, the long taper mold is held substantially horizontal, and the above-mentioned long horizontal taper mold is slowly rotated. On the other hand, a multi-layered tape consisting of a cross tape impregnated with a resin containing a curing agent and a glass matte tape was spirally wound around a long taper mold, and the multi-layered tape wound in a cylinder was cured and then removed from the long taper mold. Rotation of hollow long product characterized by producing FRP tapered hollow long product by molding
FRP molding method.

3) The rotary FRP molding method for a hollow long product according to claim 2, wherein the multi-layer tape is a single layer of roving cloth tape and glass mat tape.

4) The rotating FRP for a hollow long product according to claim 2, wherein the multi-layered tape is a multi-layered tape in which a roving cloth tape is sandwiched between two glass mat tapes.
Molding method.

5) A long taper die is supported by a total of three bearings, a bearing on the tip side and two bearings on the root side, and a lifting force is applied to the bearing near the center on the root side, and two bearings on the root side. Of the above bearings, the outer bearings are supported so that the pressing force acts on the base of the mold, and a rotary mechanism that rotates the tapered mold is provided.The annular flange is moved axially at the base of the mold. Rotating FRP for hollow long products, which is mounted so that it can be attached and detached between the collar part and the root shaft end of the mold, and is provided with push-out means such as hydraulic cylinders and pneumatic cylinders in a detachable manner.
Molding equipment.

It is in.

(Operation) In the present invention, the large-diameter root-side shaft end of the long tapered die is supported by two or more bearings, and an upward or downward load is applied through these bearings so that the central portion of the die is slightly upward. The vertical die is maintained in a substantially horizontal state by canceling the downward displacement of the die due to the weight of the die and the weight of the FRP.

A large load is not applied to the tapered tip end bearing of the taper die, and the load is slightly shared only by holding it lightly to prevent rotational shake.

Therefore, even if there is no intermediate support, it can be supported substantially horizontally and the molding operation can be performed, and the conventional problems are solved.

Then, the taper die is rotated, and the cross tape impregnated with the curing agent is wound around the taper die in a spiral shape so that the cloth material can be continuously and integrally formed. Unlike the one in which only the minute is divided into upper and lower parts, the molding can be performed continuously, resulting in extremely high work efficiency. Moreover, since there is no overlapping portion (joint portion) (34) of the joint, the work for treating the joint portion is unnecessary, and there is no reduction in strength. After curing, if the hydraulic cylinder of the present invention is operated, a spreading force is exerted between the shaft portion and the free flange portion, and the flange is moved toward the tip of the mold to rapidly release the FRP product. Is.

In the FRP continuous molding method of the present invention, not only a cloth tape such as a roving cloth material, etc., but also a single layer of a roving cloth tape and a glass mat tape, each of which is laminated with a material such as a glass mat that does not have very high tensile strength. Alternatively, a multilayer tape having a plurality of layers or a multilayer tape in which a roving cloth tape is laminated between two glass mat tapes can be used. Adhesion of the tape is improved by stacking the glass mats.

(Examples) Examples will be described below with reference to the drawings.

The examples shown in FIGS. 1 to 6 are examples of molding of FRP products in which a main girder of a tapered wind turbine blade is molded with a multilayer tape of a roving mat and a glass mat.

As the multi-layer tape to be wound, a roving cloth material and a glass mat each having a single layer are used. In the figure, (1) is a long taper mold with a trickle of about 800m weighing 12m and having a diameter of 1: 7 at the tip and the base,
It is made as light as possible using metal plates and thick letters.
(2) is the bearing on the tip side, (3) and (4) are the bearings on the base side of the tapered die, and the bearing near the center is (3) two rollers (1
The bearing (3) near the center applies an upward load to the tapered mold (1), and the bearing (4) toward the outside gives a downward load. (5) has a width of 300m
About 6 m of roving cloth tape, (6) glass mat tape, (7) unsaturated polyester resin impregnation tank, (8) multi-layer tape, (9) extension of shaft end of tapered mold (1) The sprocket provided in the part, (10) is a chain for rotating the sprocket by the electric motor (15) with a transmission, (11) is a demolding hydraulic cylinder, and (12) is a side frame of the tapered mold (1). The ring collar, (13) is a mounting bolt for the collar, (14) is an FRP product, and (15) is a bolt for detachably attaching the demolding hydraulic cylinder (11) to the ring collar (12).

In this embodiment, the tip of the long tapered die (1) is lightly supported by a bearing (2), and the base side thereof is supported by two bearings (3), (4). Bearing near the center (3)
Is slightly elevated so that the tapered mold (1) is pushed upward. Further, the bearing (4) on the outer side applies a force in a downward pushing direction. By applying the load in this way, as shown in FIGS. 2 and 4, the bending of the tapered mold (1) can be held and supported in a substantially horizontal state. A release paper (17) and a release agent are applied to the outer periphery of the tapered mold (1) before winding a cloth tape or the like (see FIG. 1B). The multi-layer tape (8) is formed by unwinding the roving cloth tape (5) wound around the hobby and the glass mat tape (6) and overlapping them in the middle to impregnate them with the unsaturated polyester resin curing agent through the resin impregnation tank (7). Then, the taper mold (1) is rolled up (see FIGS. 1C and 5). While slowly rotating the taper mold (1) by the chain (10) and the sprocket (9), the multilayer tape (8) impregnated with the resin containing the curing agent is spirally wound around the taper mold (1) ( (See FIG. 1C). Winding is done in a spiral with a pitch shorter than the width of the tape so that a considerable part is overlapped. Winding proceeds from the tip to the root and repeated multiple times. After wrapping the multilayer tape (8) and curing it sufficiently, the mounting bolts (13) for the annular collar (12)
Remove, and fix the pair of left and right hydraulic cylinders (11) to the annular collar (12) with bolts (15), and when actuated, the collar (12) moves toward the tip of the tapered mold (1) and winds it. The hardened FRP product (14) is pushed in the tip direction and released from the tapered mold (1) (Fig.
See figure). After demolding, FRP product of the root tip (14)
Cut the required size. Figure 6 shows the completed FRP product. The embodiment shown in FIG. 8 is the invention according to claim 4, and a roving cloth tape (5) is sandwiched between two glass mat tapes (6) as a multi-layered tape (8) for three layers. This is an example of using a layered tape. In this example, a resin containing a curing agent is impregnated into the multilayer tape (6) with a brush or a nozzle (18) above the tapered mold (1). In the case of this three-layer multilayer tape, it is inexpensive, has excellent adhesive strength, and can be formed into a thick wall. The other points are the same as those of the previous embodiment, and have the same operational effects.

(Effects of the Invention) As described above, according to the present invention, since the method of continuously winding and integrally winding the cross tape around the taper mold is used, the joining surface processing operation is not necessary and the molding can be performed quickly. Not only that, there is no joint, so there is no reduction in strength. Furthermore, the tapered die is supported by bearings of three or more points, and it is maintained horizontally without bending by applying a predetermined load and can be continuously integrally molded without intermediate support, greatly improving work efficiency. did it. Further, according to the apparatus of the present invention, there is an effect that demolding can be easily performed.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a process of an embodiment of a rotary FRP molding method for a hollow long product of the present invention, FIG. 2 is a front view showing the apparatus of the same embodiment, and FIG. 3 is a root of a tapered mold of the present invention. FIG. 4 is an explanatory view showing a side bearing portion, FIG. 4 is an explanatory view showing how a bearing load is applied and displacement of a tapered mold, FIG. 5 is an explanatory view showing a tape impregnated and wound, and FIG. 6 is the same embodiment. FIG. 7 is a perspective view showing an FRP product, FIG. 7 is a sectional view of the same FRP product, FIG. 8 is an explanatory view showing an embodiment of the invention described in claim 2, and FIG. 9 is a conventional FRP molding method. Explanatory diagram showing the supporting state of the mold, the tenth,
Figures 11, 12, and 13 are sectional views taken along the lines AA, BB, CC, and DD of Fig. 9, Fig. 14 is a sectional view of a conventional FRP product, and Fig. 15 is a conventional FRP molding. FIG. 16 is an explanatory diagram showing a method, and FIG. 16 is an explanatory diagram showing a conventional mold releasing method for FRP products. (1): Wire mold, (2), (3), (4): Bearing (5): Roving cloth tape (6): Glass mat tape (7): Resin impregnation tank, (8): Multilayer tape (9): Sprocket, (10): Chain (11): Hydraulic cylinder, (12): Annular collar (13): Mounting bolt, (14): FRP product (15): Bolt

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location B29L 23:00 (72) Inventor Nobuyuki Tasaki 11-13 Bunkyo-cho, Nagasaki-shi, Nagasaki Japan Cold Energy Co., Ltd. (72) Inventor Yoshimi Ide 11-13, Bunkyo-cho, Nagasaki-shi, Nagasaki Japan Cold Energy Co., Ltd. (72) Inventor Motoharu Inoue 11-13 Bunkyo-cho, Nagasaki-shi, Nagasaki Japan Cold Energy Company (72) Inventor Yasunari Furuta 11-13 Bunkyo-cho, Nagasaki City, Nagasaki Prefecture

Claims (5)

[Claims] 1. A long taper die having different diameters at its tip and at its base is horizontally mounted by bearings arranged at its both ends,
Provide another bearing at the end of the die on the base side with high rigidity, and apply a required lifting load or push-down load to two or more bearings on the root side to make a long tapered die almost horizontal. Hold the tape in place and slowly rotate the above-mentioned long taper mold that is approximately horizontal, and wrap the cross tape impregnated with the resin containing the curing agent in a spiral shape around the long taper mold to form a tubular shape in the taper mold. A rotary FRP molding method for hollow long products, characterized by producing a FRP tapered hollow long product by removing the cross tape wound up on the tape from the tapered mold after curing. 2. A long taper die having different diameters at the tip and at the base is horizontally mounted by bearings arranged at both ends of the die.
The end of the die on the base side, which has high rigidity, receives another bearing, and the required lifting load or push-down load is applied to the two or more bearings on the root side to make the long tapered die almost horizontal. Hold the above, and while slowly rotating the above-mentioned substantially horizontal elongated taper die, spirally form a multi-layered tape of a cross tape impregnated with a resin containing a curing agent and a glass mat tape on the elongated taper die. FR which is wound up and rolled up in a tubular shape and cured from the long taper mold after curing
A rotary FRP molding method for hollow long products, which is characterized by producing tapered hollow long products. 3. The rotary FRP molding method for a hollow long product according to claim 2, wherein the multi-layer tape is formed by superposing each single layer of a roving cloth tape and a glass mat tape. 4. The rotary FRP molding method for a hollow long product according to claim 2, wherein the multi-layered tape is a multi-layered tape in which a roving cloth tape is sandwiched between two glass mat tapes. 5. A long taper die is axially supported by a total of three bearings, a bearing on the tip side and two bearings on the root side, and a lifting force is applied to the bearing near the center on the root side, Out of the two bearings, the outer bearing is supported so that the pressing force acts on the base of the mold, and a rotating mechanism that rotates the tapered mold is provided.In addition, an annular collar is attached to the base of the mold. It is mounted so that it can be moved in any direction, and a pressing and expanding means such as a hydraulic cylinder or a pneumatic cylinder is detachably installed between the flange and the root shaft end of the mold to rotate a hollow long product. FRP molding equipment.