WO2019066109A1

WO2019066109A1 - Blade manufacturing method

Info

Publication number: WO2019066109A1
Application number: PCT/KR2017/011014
Authority: WO
Inventors: 허철구; 허철기; 정병기; 권종정; 김재두; 전준민; 이보건; 김종명
Original assignee: (주)영광공작소
Priority date: 2017-09-29
Filing date: 2017-09-29
Publication date: 2019-04-04
Also published as: KR102049818B1; KR20190037485A

Abstract

A blade manufacturing method of the present invention can comprise: a root part manufacturing step of injecting air into a root bladder, which corresponds to a blade root part, so as to press a prepreg, and applying preset temperature, thereby manufacturing a root part; a tip part manufacturing step of injecting air into a tip bladder, which corresponds to a blade tip part, so as to press the prepreg, and applying preset temperature, thereby manufacturing a tip part; a rib manufacturing step of manufacturing a rib formed in an uneven shape, having one end accommodated inside the root part and having the other end accommodated inside the tip part; a rib coupling step of coupling the ribs to the inner sides of the root part and the tip part; and a blade forming step of forming a blade by coupling the root part and the tip part so as to bring the same in contact with each other.

Description

Blade manufacturing method

The present invention relates to a blade manufacturing method, and more particularly, to a blade manufacturing method for manufacturing a blade used in a small-size wind turbine, which is light in weight and improved in strength.

Generally, a wind turbine converts wind energy into rotational kinetic energy, thereby producing electrical energy. It is used as an environmentally friendly and relatively economical alternative energy source. Recently, it has been used as an environmentally friendly alternative energy source such as being used for energy storage system (ESS, Energy Storage Systems) by converting it into various energy in addition to electric energy. Of the various types of wind turbines described above, small wind turbines have the advantage of low initial investment costs and ease of installation.

In such a small wind turbine, a blade formed around the hub is rotated by the wind, and the rotation is connected to the generator to be converted into electric energy. In other words, the air particles hit the blade while moving, and the blade is rotated by the force of the air that is hit. Therefore, the blades used in small wind turbines are an important part that affects the efficiency of wind turbines.

Korean Patent Laid-Open No. 10-2010-0025753 discloses a technique related to a conventional blade manufacturing method for manufacturing the above-described blades of a wind turbine.

However, in the conventional method of manufacturing a blade, after forming the upper and lower plates respectively, the upper and lower plates are welded together to form the blades. Accordingly, the conventional blade is produced by using vacuum epoxy molding or the like for the upper plate and the lower plate, respectively, so that the productivity is lowered and the welded portion is formed entirely along the periphery of the tip portion at the root portion and the durability of the turbine can be lowered due to the welded portion .

On the other hand, when designing a blade of a small wind turbine, the TSR, which is the ratio between the wind speed and the blade tip speed, is designed. That is, since the design of the blades is optimized to a predetermined TSR, the wind turbine exhibits high efficiency versus wind speed when rotated to a given TSR value. However, in the actual environment, there is a problem that the wind speed continuously changes and the efficiency may be degraded because the driving TSR and the actual TSR do not exactly coincide. Therefore, it is difficult to optimize the wind speed and the rotor rotation speed as the mass of the blade is larger. Therefore, in order to minimize the difference between the operation TSR and the actual TSR, a lightweight blade is required to reduce the moment of inertia. That is, the lighter the blade, the easier it is to achieve precise balancing of the rotor required at high speed rotation. In addition, since the blade is a device for changing the wind to an axis, it must be able to withstand the thrust generated when it is put in a stop state before a strong wind of about 50 m / s.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of manufacturing a blade that can be manufactured from a lightweight material and has improved strength and improved turbine efficiency and productivity.

According to an aspect of the present invention, there is provided a method of manufacturing a blade, the method comprising: injecting air into a root bladder corresponding to a root portion of a blade to press a prepreg; A root part manufacturing step; Forming a tip portion by injecting air into the tip bladder corresponding to the tip portion of the blade to press the prepreg and applying a predetermined temperature to the tip portion; A rib manufacturing step of manufacturing a rib having one end housed inside the root portion and the other end housed inside the tip portion, the rib being formed in a concavo-convex shape; A rib coupling step of coupling the rib to the inside of the root portion and the tip portion; And a blade forming step of joining the root portion and the tip portion to each other to form a blade.

Wherein the step of preparing the root portion comprises the steps of arranging a prepreg in a root mold having a space corresponding to the root portion; A root bladder inserting step of inserting a root bladder into the prepreg disposed in the root prepreg placing step; Forming a root portion by injecting air into the root bladder inserted in the step of inserting the root bladder to press the prepreg toward the root mold side and applying a predetermined temperature to form the root portion .

It is preferable that the root portion manufacturing step further includes a root bladder manufacturing step in which the root bladder is manufactured so as to correspond to the shape of the root portion.

The tip manufacturing step may include a tip prepreg placement step of arranging a prepreg inside a tip mold having a space corresponding to the tip portion; A tip bladder inserting step of inserting the tip bladder into the prepreg disposed in the tip prepreg placing step; Forming a tip portion by injecting air into the tip bladder inserted in the insertion of the tip bladder to press the prepreg toward the tip mold and applying a predetermined temperature to the tip portion.

The tip portion manufacturing step may further include a tip bladder manufacturing step of manufacturing the tip bladder so as to correspond to the shape of the tip portion.

The rib manufacturing step may be manufactured by pressing the prepreg.

The rib combining step may include one rib side engaging step of engaging one side of the rib and the root portion so that one side of the rib is accommodated inside the root portion and the other side protrudes outward of the root portion; The other side of the rib is coupled with the tip portion by inserting the other side of the rib coupled to the root portion in the one side of the rib in the one side of the rib to the inside of the tip portion so that the root portion and the tip portion are in contact with each other, . &Lt; / RTI >

In this case, the one side of the rib is pressed toward the prepreg by injecting air into the rib bladder by inserting the prepreg and the rib bladder between the inner circumferential surface of the root portion and one side of the rib , It is preferable that one side of the rib is joined to the root portion by applying a predetermined temperature.

The rib-to-rib attaching step includes a rib-side placing step of placing the rib in the root portion so that one side of the rib is housed inside the root portion and the other side is projected outward of the root portion; A rib-side prepreg placement step of arranging prepregs on the upper and lower sides of the ribs disposed in the root portion, and a rib bladder inserted between one side of the rib and the prepreg disposed in the rib- A step of inserting a rib into one side of the rib by applying air to the inside of the rib bladder to press the rib toward the prepreg and applying a predetermined temperature to the rib, .

Further, it is preferable that the rib-side joining step further includes a rib bladder removing step of removing the rib bladder after one side of the rib and the root are joined.

The other side of the rib may be formed by inserting a prepreg and a sacrificial bladder between the inner circumferential surface of the tip and the other side of the rib, expanding the sacrificial bladder to press the other side of the rib toward the prepreg, The other end of the rib and the tip portion can be engaged with each other.

The rib side engagement step may include a rib side placement step in which the other side of the rib is housed inside the tip portion and the rib is disposed in the tip portion; A sacrificial bladder inserting step of inserting a sacrificial bladder between the prepreg disposed in the other-side prepreg placement step and the other side of the rib; And a rib-side joining step of expanding the bladder, pressing the rib toward the prepreg side, and applying a predetermined temperature to join the other side of the rib and the tip portion.

In the rib-side bonding step, air is injected into the inside of the sacrificial bladder, the rib is pressed toward the prepreg, and a predetermined temperature is applied, thereby bonding the other side of the rib to the tip.

Meanwhile, the sacrificial bladder inserting step according to another embodiment of the rib-side fitting step may be performed by cooling the sacrificial bladder having a larger size than the space between the prepreg disposed at the rib non-side prepreg placing step and the other side of the rib .

Here, the sacrificial bladder may be inflated by applying a preset temperature, and the rib may be pressed toward the prepreg so that the other side of the rib and the tip portion are bonded to each other.

Preferably, the blade forming step includes joining the prepreg along a contact portion formed by abutting the root portion and the tip portion to form a blade by joining the root portion and the tip portion.

The blade forming step may include a blade prepreg placing step of arranging the prepreg along a contact portion where the root portion and the tip portion abut on each other, and a step of pressing the prepreg disposed in the blade prepreg placing step, And a blade prepreg joining step of joining the prepreg to the contact portion by applying the blade prepreg.

Preferably, the root portion and the tip portion are further formed with contact grooves along a contact portion where the root portion and the tip portion are in contact with each other, and the blade forming step includes disposing the prepreg in the contact groove.

According to the blade manufacturing method of the present invention, it is possible to manufacture the blades with light weight by manufacturing the blades using the prepregs, and the blades can be manufactured rapidly by molding using the root bladder and the tip bladder, and productivity and manufacturing efficiency can be improved .

In addition, the root portion and the tip portion are coupled through the ribs, thereby making it possible to manufacture blades having improved strength. By combining the root portion and the tip portion, blades can be manufactured to minimize the blade joining portion, thereby improving the efficiency of the wind turbine.

Further, the ribs can be formed in a concavo-convex shape, can be coupled along the inner circumferential surface of the root portion and the tip portion, and can be bonded and prepreg-bonded using the rib bladder to increase the bonding force and production efficiency.

In addition, since the contact groove is formed in the root portion and the tip portion, the prepreg can be accommodated in the contact groove, and the root portion and the tip portion can be joined together and the joint portion between the root portion and the tip portion is not projected, have.

1 is a flowchart showing a method of manufacturing a blade according to an embodiment of the present invention,

Fig. 2 is a perspective view showing the manufacturing steps of the root portion of the blade manufacturing method shown in Fig. 1,

Fig. 3 is a perspective view showing a rib-to-one engaging step of the blade manufacturing method shown in Fig. 1,

FIG. 4 is a perspective view showing the rib-side coupling step of the blade manufacturing method shown in FIG. 1,

FIG. 5 is a perspective view showing a rib-side joining step of the rib-side joining step shown in FIG. 3,

6 is a perspective view showing a blade forming step of the blade manufacturing method shown in FIG. 1,

Fig. 7 is a perspective view showing another embodiment of the blade forming step of the blade manufacturing method shown in Fig. 1. Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, at the time of the present application, It should be understood that variations can be made.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIGS. 1 to 7, a method of manufacturing a blade (S10) according to an embodiment of the present invention is for manufacturing a blade 10 used in a small wind turbine, and is not limited to the small wind turbine described above, And can be applied to blades of fields. The blade manufacturing method (S10) may include a root portion manufacturing step (S100), a tip manufacturing step (S200), a rib manufacturing step (S300), a rib combining step (S400), and a blade forming step (S500).

Referring to FIG. 2, the root portion manufacturing step S100 is for manufacturing the root portion 100 of the blade 10, and one end of the root portion 100 is coupled to a rotor of the wind turbine . In the root portion manufacturing step (S100), the root portion 100 can be manufactured by applying high pressure and high temperature to the prepreg (P) material. The root part manufacturing step S100 may include a root bladder manufacturing step S101, a root prepreg placement step S110, a root bladder inserting step S120, and a root forming step S130.

The root bladder manufacturing step (S101) is a step of manufacturing a root bladder corresponding to the root part (100). That is, in the step S101 of manufacturing the root bladder, the root bladder B1 is manufactured so as to correspond to the shape of the root part 100, Space is formed. In addition, an injection port for injecting air can be formed at one side of the root bladder B1, and an air injector (not shown) for injecting air into the injection port is provided, Air can be injected into the inside of the bladder B1.

The root prepreg placement step S110 is a step of arranging a prepreg material to be formed into the root part 100 and includes a root mold M1 having a space corresponding to the root part 100 , And M2 are disposed inside the prepregs (P). The root molds M1 and M2 may be composed of a root mold M1 and a root mold M2 and a space formed in the root mold M1 and the root mold M2, (P) may be disposed. The prepreg P is a material that can be hardened by heating and pressing to form a molded article. The prepreg P is laminated and applied with high temperature and high pressure to cure the prepreg P to produce the root portion 100. Therefore, it is preferable to arrange the prepregs (P) in a stacked manner in the step S110 of arranging the root prepregs. The root prepreg arrangement step S110 is a step of arranging a release film before disposing the prepreg P in the root molds M1 and M2 and then inserting a prepreg P onto one side of the release film .

The step of inserting the root bladder S120 is a step for inserting the root bladder B1 for applying a high pressure to the prepreg P disposed at the step S110 of arranging the root prepreg, The root bladder B1 is inserted into the inside of the root pod. That is, the root bladder B1 may be inserted between the plurality of prepregs P.

On the other hand, in the root bladder inserting step S120, the root bladder B1 may be further configured to include a root mold mold M3. That is, the root bladder inserting step S120 inserts the root bladder B1 into the inside of the prepreg P with the root mold M3 inserted into the root bladder B1 . The root mold M3 is for maintaining the shape of the root bladder B1 for easy insertion of the root bladder B1 into the inside of the prepreg P, Is provided on the inner side of the root bladder B1 so that the root bladder B1 can be easily inserted into the prepreg P while the shape of the root bladder B1 is maintained.

The root forming step S130 is a step of forming the root portion 100 by injecting air into the root bladder B1 to press the prepreg P and applying a predetermined temperature. That is, the root forming step S130 is a step for forming the root part 100, and air is injected into the root bladder B1 inserted in the inserting step S120 of the root bladder The root bladder B1 is inflated in all directions so that the prepreg P is pressed toward the root molds M1 and M2 and a predetermined temperature is applied to the prepreg P, So that the root portion 100 can be formed. That is, the prepreg P is pressed toward the root molds M1 and M2 by the root bladder B1 to be hardened corresponding to the shape of the space of the root molds M1 and M2, 100). Therefore, the root portion 100 can be manufactured in a light weight by being formed by stacking the prepregs P.

The tip portion manufacturing step S200 is for manufacturing the tip portion 200 of the blade 10 and one end of the tip portion 200 is coupled with the other side of the root portion 100 to form the blade 10 And the inner diameter is formed so as to become narrower from one side to the other side. In the tip manufacturing step S200, the tip portion 200 can be manufactured by applying high pressure and high temperature to the prepreg material. The tip manufacturing step S200 may include a tip bladder manufacturing step S201, a tip prepreg placing step S210, a tip bladder inserting step S220, and a tip forming step S230.

The tip bladder manufacturing step (S201) is a step of manufacturing a tip bladder corresponding to the tip portion (200). That is, in the tip bladder manufacturing step (S101), the tip bladder is manufactured to correspond to the shape of the tip portion 200, and a space is formed in the tip bladder so that air can be injected into the tip bladder. In addition, an injection port for injecting air can be formed at one side of the tip bladder, and an air injector for injecting air into the injection port is provided, and air is introduced into the tip bladder through the air injector Can be injected.

The tip prepreg placement step S210 is a step of arranging the prepreg material to be formed into the tip portion 200. The tip prepreg material placement step S210 is a step of arranging prepreg material to be formed into the tip portion 200, (P). Further, the tip mold may be composed of a tip upper mold and a tip lower mold, and a prepreg P may be disposed in a space formed in the tip upper mold and the tip lower mold. The prepreg P is a material that can be hardened by heating and pressing to form a molded article. The prepreg P is laminated and applied with high pressure and high temperature to cure the prepreg P, thereby manufacturing the tip portion 200. Therefore, it is preferable that the plurality of prepregs P are stacked and arranged in the tip prepreg placement step S210. In addition, it is preferable that the step of arranging the tip prepreg (S210) includes disposing the release film before disposing the prepreg (P) in the tip mold, and then disposing the prepreg (P) on one side of the release film.

The step of inserting the tip bladder S220 is a step for inserting a tip bladder for applying a high pressure to the prepreg P disposed at the tip prepreg placement step S210, To insert the tip bladder. That is, the tip bladder can be inserted between the plurality of prepregs P.

In addition, the tip bladder may be further provided with a mold with a tip inward in the tip bladder in the tip bladder inserting step (S220). That is, in the step of inserting the tip bladder (S220), the tip bladder can be inserted into the prepreg (P) while the tip mold is inserted into the tip bladder. The tip mold is for maintaining the shape of the tip bladder for easily inserting the tip bladder into the prepreg (P), and the tip mold is provided on the inner side of the tip bladder, The tip bladder can be easily inserted into the prepreg P while maintaining the shape of the tip bladder.

In the tip forming step S230, air is injected into the tip bladder to press the prepreg P, and the tip portion 200 is formed by applying a preset temperature. That is, the tip forming step S230 is a step for forming the tip portion 200, and air is injected into the tip bladder inserted in the tip bladder inserting step S220, The tip portion 200 can be formed by pressing the prepreg P toward the tip mold side by applying a predetermined temperature to the prepreg P by curing the prepreg P by expanding the prepreg P toward the tip mold side. That is, the prepreg P may be formed as the tip portion 100 by being pressed toward the tip mold by the tip bladder to be hardened corresponding to the shape of the space of the tip mold. Therefore, the tip portion 200 can be manufactured in a light weight by being formed by stacking the prepregs P.

The rib manufacturing step S300 is a step for manufacturing the rib 300 provided on the inner side of the root portion 100 and the tip portion 200. The rib 300 is provided on the other side of the root portion 100 and on one side of the tip portion 200 and is formed to have a concavo-convex shape. The rib 300 has one end housed inside the root portion 100 and the other end housed inside the tip portion 200. The rib manufacturing step S300 is preferably performed by laminating the prepregs P, pressing them, and curing them by applying a high temperature.

The rib combining step S400 is a step for coupling the rib 300 to the inside of the root portion 100 and the tip portion 200. The rib joining step S400 may include a one-side rib joining step S410 and a rib side joining step S420.

Referring to FIG. 3, the one side of the rib 300 is coupled to one side of the rib 300 at one side of the

rib

100, 100 and the other side of the rib 300 is coupled to protrude to the outside of the root portion 100. In the one-side fitting step S410, the prepreg P is inserted between the inner circumferential surface of the root portion 100 and one side of the rib 300, and high pressure and high temperature are applied to the prepreg P, One side of the rib 300 can be coupled to the root portion 100. That is, one side of the rib 300 abuts against the prepreg P to which the high pressure and the high temperature are applied, so that the prepreg P is cured so that one side of the rib 300 and the root portion 100 are engaged . The one rib side coupling step S410 may include one rib side placement step S411, one rib prepreg placement step S412, a rib bladder inserting step S413, and one rib side joining step S414.

The rib-side positioning step S411 arranges one side of the rib 300 so as to be accommodated in the root portion 100. [ The ribs 300 may have a concave-convex shape, and the upper and lower surfaces of the ribs 300 may be in contact with the inner circumferential surface of the root portion 100, respectively. In addition, it is preferable that the other side of the rib 300 is disposed so as to protrude to the outside of the root part 100 in the one-rib placement step S411.

The rib side prepreg placement step S412 is a step of arranging a prepreg P for coupling the rib 300 and the inner circumferential surface of the root part 100. In the rib side placement step S411, The prepregs P can be disposed on the upper side and the lower side of the ribs 300 disposed on the root portion 100.

The rib bladder inserting step S413 is a step for inserting a rib bladder for applying a high pressure to the prepreg P disposed in the rib unilateral prepreg placing step S412, The rib bladder can be inserted between the one side and the root portion 100. That is, the rib bladder inserting step (S413) is performed between the prepreg (P) disposed on the upper side and the lower side of the rib (300) and one side of the rib (300) To insert the rib bladder. It is preferable that the rib bladder is composed of a plurality of ribs and is arranged in the space between the ribs 300 and the root portion 100 corresponding to the concavo-convex shape of the ribs 300.

The one side of the rib 300 and the root portion 100 are connected to each other by applying air to the inside of the rib bladder to press the prepreg P, It is possible to join the inner circumferential surface. That is, in the one-side rib joining step (S414), air is injected into the rib bladder inserted in the rib bladder inserting step (S413), so that the rib bladder is inflated in all directions, It is possible to bond the one side of the rib 300 to the root portion 100 by pressing the prepreg P and applying a predetermined temperature to the prepreg P to harden the prepreg P. [ On the other hand, the rib side bonding step S414 may further include a rib bladder removing step S415.

The rib bladder removing step (S415) is a step for removing the inserted rib bladder in the rib bladder inserting step (S413). That is, the rib bladder removing step S415 removes the rib bladder after one side of the rib 300 and the root part 100 are joined.

The step of joining one side of the ribs S414 is performed by injecting air into the rib bladder to press the prepregs P and apply a high temperature to the root portions 100 of the root molds M1 and M2 It is preferable to arrange it in a space.

4, the other side of the rib 300 is coupled to one side of the tip portion 200, and one side of the rib 300 is connected to the root portion 100 The other side of the rib 300 is coupled to the inside of the tip portion 200. When the other side of the rib 300 is inserted into the tip portion 200, it is preferable that the root portion 100 and the tip portion 200 are disposed in contact with each other. The rib side coupling step S420 may include inserting the prepreg P between the inner circumferential surface of the tip portion 200 and the other side of the rib 300 to apply high pressure and high temperature to the prepreg P, And the other side of the tip portion 200 may be coupled to the tip portion 200. That is, the other side of the rib 300 abuts on the prepreg P to which the high pressure and the high temperature are applied, so that the prepreg P is cured so that the other side of the rib 300 can be engaged with the tip portion 200 . The rib side joining step S420 may include a rib side placement step S421, a rib side prepreg placement step S422, a sacrificial bladder inserting step S423, and a rib side joining step S424.

The other rib side positioning step S421 arranges the other side of the rib 300 so as to be accommodated inside the tip portion 200. The ribs 300 may have a concave-convex shape, and may be disposed such that the upper surface and the lower surface of the rib 300 are in contact with the inner circumferential surface of the tip portion 200, respectively. The other side of the root portion 100 and one side of the tip portion 200 may be arranged to be in contact with each other by arranging the other side of the rib 300 on the tip portion 200 have.

The rib side prepreg placement step S422 is a step of arranging a prepreg P for coupling the other side of the rib 300 and the inner circumferential face of the tip portion 200. The rib side prepreg placement step S422 The prepreg P may be disposed on the upper side and the lower side of the rib 300 disposed on the tip portion 200. [

The sacrificial bladder inserting step S423 is a step for inserting a sacrificial bladder B2 for applying a high pressure to the prepreg P disposed in the other-side prepreg placement step S422, The sacrificial bladder B 2 is inserted between the other side of the cap part 300 and the tip part 100. That is, the sacrificial bladder inserting step S423 is performed between the prepreg P disposed on the upper side and the lower side of the rib 300 and the other side of the rib 300 in the rib non-side prepreg placing step S422 And insert the sacrificial bladder B2. It is preferable that the sacrificial bladder B2 is composed of a plurality of sacrificial bladders B2 and is arranged in a space between the other side of the rib 300 and the tip portion 200 corresponding to the concavo-convex shape of the rib 300. [

5, air is injected into the inside of the sacrificial bladder B2 by pressing the prepreg P and applying a preset temperature to the rib 300, And the inner peripheral surface of the tip portion 200 can be joined to each other. That is, in the rib side joining step S424, air is injected into the sacrificial bladder B2 inserted in the sacrificial bladder inserting step S423, thereby inflating the sacrificial bladder B2 in all directions, The prepreg P is pressed to the prepreg P side and the predetermined temperature is applied to the prepreg P to cure the prepreg P to join the other side of the rib 300 to the tip portion 200 .

Meanwhile, the sacrificial bladder inserting step S423 may be a sacrificial bladder having a larger size than the space between the other side of the rib 300 and the tip portion 100, B2) may be inserted. More specifically, the sacrificial bladder inserting step (S423) includes a sacrificial bladder having a larger size than a space between the prepreg (P) disposed in the rib non-side prepreg placing step (S422) and the other side of the rib (B2) may be fabricated and inserted between the other side of the rib (300) and the tip portion (100). At this time, the sacrificial bladder B2 is cooled and reduced in size so as to be accommodated in the space between the prepreg P disposed at the rib non-side prepreg placement step S422 and the other side of the rib 300 , And is inserted between the other side of the rib (300) and the tip portion (100). The sacrificial bladder B2 is formed to be larger than the space between the other side of the rib 300 corresponding to the concavo-convex shape of the rib 300 and the tip portion 200, The ribs 300 may be formed in a space between the other side of the ribs 300 and the tip portion 200 so as to be accommodated in a space between the other side of the ribs 300 and the tip portion 200.

In addition, the rib side joining step S424 may include a step of expanding the sacrificial bladder B2 by applying a predetermined temperature and pressing the prepreg P by the expanded sacrificial bladder B2, And the inner peripheral surface of the tip portion 200 can be joined to each other. That is, the sacrificial bladder B2, which is cooled in the sacrificial bladder inserting step S423 and inserted in a reduced size, is expanded by a predetermined temperature in the rib-side joining step S424, And the sacrificial bladder B2 is inflated to press the rib 300 toward the prepreg P and cure the prepreg P by the applied temperature so that the other side of the rib 300 And the inner circumferential surface of the tip portion 200 can be joined.

Meanwhile, it is preferable that the sacrificial bladder B2 expanded in the rib-side joining step S424 remains inserted between the other side of the rib 300 and the tip portion 100, It is preferable that the tip portion 100 is disposed in the space of the tip mold when air is injected into the sacrificial bladder B2 to pressurize the prepreg P and apply a high temperature.

Referring to FIG. 6, the blade forming step (S500) is a step for forming the blade 10 by coupling the root portion 100 and the tip portion 200 in contact with each other. That is, the blade forming step S500 is a step of joining the prepreg P along the contact portion formed by contacting the root portion 100 and the tip portion 200 in the rib side placement step S421, Thereby coupling the portion 100 and the tip portion 200 together. The blade forming step S500 may include a blade prepreg placing step S510 and a prepreg joining step S520.

The step of arranging the blade prepregs S510 is a step of disposing a prepreg P for contacting the root portion 100 and the tip portion 200. The root portion 100 and the tip portion 200 And the prepregs P are disposed along the contact portions contacting each other.

The blade prepreg joining step S520 presses the prepreg P disposed along the contact portion where the root portion 100 and the tip portion 200 abut against each other in the blade prepreg placement step S510, And a predetermined temperature is applied to bond the prepreg P to the contact portion. The root portion 100 and the tip portion 200 can be stably bonded by pressing the prepreg P disposed at the contact portion and applying a predetermined temperature to harden the root portion 100. [

7, the root portion 100 and the tip portion 200 may have contact grooves 101 along the contact portion where the root portion 100 and the tip portion 200 abut on each other . The contact groove 101 is formed such that the contact groove 101 is formed in the shapes of the root portion 100 and the tip portion 200 manufactured in the root portion manufacturing step S100 and the tip portion manufacturing step S200 And the like. Accordingly, the blade forming step S500 may include a step in which the prepreg P is disposed in the contact groove 101 so as to press the prepreg P disposed at the contact portion to form the root portion 100 and the tip portion 200) are preferably combined. The prepreg P is disposed in the contact groove 101 in the blade prepreg placing step S510 and the prepreg P disposed in the contact groove 101 in the blade prepreg joining step S520 P by applying a high pressure and a high temperature so that the root portion 100 and the tip portion 200 can be bonded to each other.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

= Explanation of symbols =

10: blade 100: root portion

101: contact groove 200: tip portion

P: prepreg B1: root bladder

B2: Sacrifice bladder

Claims

A root portion manufacturing step of injecting air into the root bladder corresponding to the root portion of the blade to press the prepreg and applying a predetermined temperature to produce a root portion;

Forming a tip portion by injecting air into the tip bladder corresponding to the tip portion of the blade to press the prepreg and applying a predetermined temperature to the tip portion;

A rib manufacturing step of manufacturing a rib having one end housed inside the root portion and the other end housed inside the tip portion, the rib being formed in a concavo-convex shape;

A rib coupling step of coupling the rib to the inside of the root portion and the tip portion; And

And forming a blade by engaging the root portion and the tip portion so as to be in contact with each other.
The method according to claim 1,

Wherein the root portion manufacturing step comprises:

A root prepreg placement step of placing a prepreg inside the root mold in which a space corresponding to the root part is formed;

A root bladder inserting step of inserting a root bladder into the prepreg disposed in the root prepreg placing step;

Forming a root portion by injecting air into the root bladder inserted at the insertion of the root bladder to press the prepreg toward the root mold side and applying a predetermined temperature to form a root portion, Way.
The method according to claim 1,

Wherein the root portion manufacturing step comprises:

And a root bladder manufacturing step in which the root bladder is manufactured so as to correspond to the shape of the root portion.
The method according to claim 1,

In the tip portion manufacturing step,

A tip prepreg placement step of placing a prepreg inside a tip mold having a space corresponding to the tip portion;

A tip bladder inserting step of inserting the tip bladder into the prepreg disposed in the tip prepreg placing step;

Forming a tip portion by applying air to the inside of the tip bladder inserted in the insertion step of the tip bladder to press the prepreg toward the tip mold side and applying a predetermined temperature to form a tip portion, .
The method according to claim 1,

In the tip portion manufacturing step,

And a tip bladder manufacturing step of manufacturing the tip bladder so as to correspond to the shape of the tip portion.
The method according to claim 1,

In the rib manufacturing step,

A method of manufacturing a blade by pressurizing a prepreg.
The method according to claim 1,

Wherein the rib-

One side of the rib is engaged with one side of the rib so that one side of the rib is housed inside the root portion and the other side is projected outside the root portion;

The other side of the rib is coupled with the tip portion by inserting the other side of the rib coupled to the root portion in the one side of the rib in the one side of the rib to the inside of the tip portion so that the root portion and the tip portion are in contact with each other, &Lt; / RTI >
The method of claim 7,

Wherein the rib-

A prepreg and a rib bladder are inserted between the inner circumferential surface of the root portion and one side of the rib to inject air into the inside of the rib bladder to press one side of the rib toward the prepreg side, And joining the root portion to one side of the rib.
The method of claim 8,

Wherein the rib-

A rib side positioning step of arranging the rib in the root portion so that one side of the rib is housed inside the root portion and the other side is projected to the outside of the root portion;

A rib-side prepreg placement step of arranging the prepregs on the upper and lower sides of the ribs arranged in the root part in the rib-side placement step,

A rib bladder inserting step of inserting a rib bladder between one side of the rib and the prepreg disposed in the one-side rib prepreg placement step,

And a rib-side joining step of joining one side of the rib and the root portion by injecting air into the rib bladder to press the rib toward the prepreg side and applying a predetermined temperature.
The method of claim 9,

The rib-side bonding step may include:

Further comprising a rib bladder removing step of removing the rib bladder after one side of the rib and the root part are joined.
The method of claim 8,

The rib side joining step may include:

A prepreg and a sacrificial bladder are inserted between the inner peripheral surface of the tip portion and the other side of the rib, the sacrificial bladder is inflated to press the other side of the rib toward the prepreg, And the tip portion.
The method of claim 11,

The rib side joining step may include:

A rib side accommodating step of accommodating the other side of the rib inside the tip portion and arranging the rib in the tip portion;

A rib-side prepreg placement step of arranging the prepregs on the upper and lower sides of the ribs disposed in the tip portion in the rib-side placement step;

A sacrificial bladder inserting step of inserting a sacrificial bladder between the prepreg disposed in the rib non-prepreg placing step and the other side of the rib;

And a rib-side joining step of expanding the sacrificial bladder to press the rib toward the prepreg side, and applying a predetermined temperature to join the other side of the rib and the tip portion.
The method of claim 12,

The rib side joining step may include:

And the other side of the rib is joined to the tip by injecting air into the sacrificial bladder to press the rib toward the prepreg side and applying a predetermined temperature.
The method of claim 12,

Wherein the sacrificial bladder inserting step comprises:

And the sacrificial bladder having a larger size than the space between the prepreg disposed on the other side of the rib and the other side of the rib is cooled and inserted.
15. The method of claim 14,

The rib side joining step may include:

And expanding the sacrificial bladder by applying a predetermined temperature so as to press the rib toward the prepreg side so that the other side of the rib and the tip portion are bonded.
The method according to claim 1,

Wherein the blade forming step comprises:

And joining a prepreg along a contact portion formed by contacting the root portion and the tip portion to each other to join the root portion and the tip portion to form a blade.
18. The method of claim 16,

Wherein the blade forming step comprises:

A blade prepreg arranging step of arranging the prepreg along a contact portion where the root portion and the tip portion abut on each other,

And a blade prepreg bonding step of pressing the prepreg disposed in the blade prepreg placing step and applying a predetermined temperature to join the prepreg to the contact part.
18. The method of claim 16,

Wherein the root portion and the tip portion are further formed with contact grooves along a contact portion where the root portion and the tip portion abut each other,

Wherein the blade forming step comprises:

And a prepreg is disposed in the contact groove.