JP2006299983A - Method of manufacturing blade for generation of electricity by wind or water power - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of relatively inexpensively manufacturing a lightweight and highly-rigid blade for generation of electricity by wind or water power with metallic material. <P>SOLUTION: First, a hollow metallic girder 5 having a substantially quadrangular transverse section is prepared, and then the hollow metallic girder 5 is installed in a hollow metallic tubular material M4. Both ends of the hollow metallic tubular material M4 receiving the hollow metallic girder 5 therein are sealed by seal means (21, 31) and liquid is filled in the hollow metallic girder 5 and the metallic tubular material M4. By applying press working to the metallic tubular material M4 containing the metallic girder 5 and the liquid therein with press dies (12, 14), the metallic tubular material M4 is formed into an aerofoil shape the transverse section of which is approximate to a streamlined shape, without substantially changing the shape of the transverse section of the metallic girder 5. Thus, it is possible to obtain the aerofoil-shaped blade for generation of electricity by wind or water power, which incorporates the hollow metallic girder 5 therein. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method of manufacturing a blade (a blade member or blade member of a wind turbine) that constitutes a wind turbine of a wind turbine generator such as wind power generation or hydropower generation.

  In general, blades constituting a wind turbine of a wind turbine generator are required to satisfy both mechanical strength and light weight. For this reason, various blades using fiber reinforced resin (FRP) as a constituent material and manufacturing methods thereof have been proposed (for example, Patent Documents 1 and 2). However, in order to make the most of the characteristics of FRP, it is necessary to construct a blade by laminating a plurality of various resin layers as in Patent Documents 1 and 2. Therefore, in addition to the fact that the material cost of the FRP itself is high, FRP blades have a problem of low productivity and high manufacturing cost, which is one of the reasons why the spread of wind power generators does not progress.

  On the other hand, as disclosed in Patent Document 3, there is also an attempt to manufacture blades constituting a fan for an outdoor unit of an air conditioner using a metal material. In Patent Document 3, a bag-shaped sheet metal product (intermediate product) is sandwiched between upper and lower molds having a predetermined internal shape, and the product is expanded by introducing high-pressure air into the bag-shaped sheet metal product. Bag-shaped sheet metal products are plastic processed into an outer shape that matches the inner shape between the upper and lower molds. Furthermore, the blade is completed in a state where a plate (that is, a sealing means) is arranged in the opening of the bag-shaped sheet metal product to which the blade shape is imparted by plastic processing and high-pressure air is sealed inside. In this way, the internal pressure of the blade is made higher than the atmospheric pressure, thereby maintaining the shape of the blade, ensuring the rigidity, and reducing the weight.

  By the way, in order to complete the blade while enclosing the high-pressure air inside, it is necessary to reliably close the opening of the bag-shaped sheet metal product provided with the blade shape by plastic working to realize a high airtight state. However, in order to create a high airtight state under high pressure conditions, advanced technology and equipment are required, so the method of Patent Document 3 does not lead to cost reduction. Moreover, although the technique of patent document 3 may be applicable to a comparatively small blade | wing thing like the fan for outdoor units of an air conditioner, it applies to a huge airfoil structure like a blade for wind power generation. It is not easy. This is because wind power generation blades are particularly required to be resistant to bending and twisting, but do not have a reinforcing structure such as girders, back bones or partition frames as in Patent Document 3, and contain high-pressure air. This is because it is extremely difficult to secure the necessary rigidity by itself.

JP-A-6-66244 JP 2002-137307 A JP 2000-135534 A (fan for home appliances)

  An object of the present invention is to provide a method for manufacturing a lightweight and highly rigid blade for hydrodynamic power generation using a metal material at a relatively low cost.

  The invention according to claim 1 is a girder preparation step of preparing a hollow metal girder having a substantially quadrangular cross section, an arrangement step of accommodating and arranging the hollow metal girder inside a hollow metal tube, Sealing both ends of the hollow metal girder containing the hollow metal girder, filling the hollow metal girder and metal pipe with fluid, and including the metal girder and fluid inside By pressing the metal pipe material in an open state using a press die, the cross section of the metal pipe material approximates the streamline shape without forcing a substantial change in the cross section shape of the metal beam. And a fluid pressure pressing step for imparting the airfoil shape to the blade for wind and hydroelectric power generation.

  According to a second aspect of the present invention, in the method of manufacturing a blade for wind-hydraulic power generation according to the first aspect, in the fluid pressure pressing step, the pressure of the fluid filled in the hollow metal tube is changed only to the fluid pressure. Thus, the pressure is maintained at a pressure value (P1) at which the metal tube material cannot expand or deform.

  According to a third aspect of the present invention, in the method for manufacturing a blade for wind-hydraulic power generation according to the first or second aspect, in the girder preparation step, both ends of a hollow metal base tube serving as a starting material are sealed, Filling the inside of the metal base tube with a fluid, and pressing the metal base tube containing the fluid into a shape so that the cross section of the metal base tube is a substantially square shape. A hollow metal girder having a substantially square cross section is prepared through a step of applying.

  According to a fourth aspect of the present invention, in the method for manufacturing a blade for wind-hydraulic power generation according to any one of the first to third aspects, in the fluid pressure pressing step, a wall of the blade body that is provided with the airfoil shape is provided. Inward projections or ridges are simultaneously formed in a part, and the inward projections or ridges are bitten into a part of a wall constituting the metal beam member.

  According to a fifth aspect of the present invention, in the method for manufacturing a blade for wind-hydraulic power generation according to any one of the second to fourth aspects, after the fluid pressure pressing step, the pressure in the blade body having the airfoil shape is changed to the metal. It is further characterized by further comprising a re-pressurization step for increasing the pressure value (P2) to a pressure value (P2) higher than the pressure value (P1) to the extent that the pipe material cannot expand or deform.

  A sixth aspect of the present invention is the method of manufacturing a blade for a straight blade vertical axis wind-hydraulic power generation according to any one of the first to fifth aspects, wherein, in the fluid pressure pressing step, a cross section is a streamline with respect to the metal tube material. A straight airfoil shape approximate to the shape is given.

[Action]
According to the method of the present invention, a metal tube material is pressed in a state in which a hollow metal beam and a fluid are contained inside a hollow metal tube material as a precursor for constituting the skin portion of the blade. Thus, the metal tube material is formed into an airfoil shape whose cross section approximates a streamline shape. In press working in a state where a hollow metal tube is filled with fluid, during pressurization, the fluid uniformly applies pressure to the entire inside of the metal tube due to the Pascal principle, so that the hollow metal tube is wrinkled and crushed. In this way, the airfoil is formed into a desired airfoil shape that matches the shape of the press die. In addition, since the fluid is filled in and out of the hollow metal girder housed inside the hollow metal tube material, the inner and outer surfaces of the metal girder are subjected to the same pressure during pressurization due to Pascal's principle. Therefore, as long as the press die is not shaped to force deformation to the metal girders, even if the metal pipe is pressed with the press die, the cross-sectional shape of the metal girders will not be substantially changed. However, the metal tube material is formed into a desired airfoil shape with the substantially square hollow metal girder incorporated therein. As described above, according to the method of the present invention, a hollow metal girder having a substantially quadrangular cross section is provided as a reinforcing material, and a blade for wind and hydroelectric power generation integrated with a blade-shaped blade body is fluidized. It can be manufactured with high precision and efficiency by pressure pressing.

  According to claim 2, the fluid that fills the inside of the metal tube does not hinder the shape imparting by the press die, and the metal tube is shaped with excellent accuracy by the press die. In addition, as a pressure value (P1) of a grade which cannot raise | generate an expansion | swell or a deformation | transformation of a metal pipe material only by a fluid pressure, 0.1-30 MPa is suitable.

  According to the third aspect of the present invention, it is possible to easily and surely prepare a hollow metal base tube that is easily available for comparison as a starting material by a fluid pressure pressing method. According to the fourth aspect, the inward projections or protrusions simultaneously formed on a part of the wall constituting the blade body bite into a part of the wall constituting the metal girder which is recessed by that. As a result, a close engagement relationship is established between the inward projections or ridges of the blade body and the concave constituent wall of the metal girder, and the fixing of the metal girder inside the blade is ensured (FIG. 7). reference).

  According to claim 5, in the fluid pressure pressing step, even if, for example, an unintentional dent is generated, the pressure in the blade body of the airfoil shape is determined from the initial pressure value (P1) before removing the mold. By performing the re-pressurizing process to increase the pressure value to a high pressure value (P2), the airfoil shape that exactly matches the original shape of the press die can be accurately given by eliminating the unintentional dent. In addition, as a pressure value (P2) higher than the said pressure value (P1), 50 MPa-200 MPa are suitable.

  According to the method for manufacturing a blade for wind and hydroelectric power generation according to each claim, since a hollow metal girder material as a reinforcing material is embedded inside the airfoil-shaped blade body, the weight of the blade is reduced. Stiffness can be increased. Further, since the metal beam member can be fixed in the blade body and integrated together in the process of the fluid pressure press, it is possible to manufacture a blade that is not easily broken and has excellent shape and dimensional accuracy. Furthermore, since both the blade body and the internal girder are made of metal, the material cost is relatively low, and plastic processing using a press die makes it possible to use FRP for manufacturing man-hours, manufacturing time, and manufacturing cost. Compared to the conventional example, it can be greatly reduced.

  Hereinafter, an embodiment in which the present invention is applied to manufacture of a blade for a straight blade vertical axis wind power generator will be described with reference to the drawings.

  As shown in FIG. 1, the wind turbine of the straight blade vertical axis type wind turbine generator is provided on the top of a pole 1 that is erected vertically to an installation surface (for example, the ground). A vertical rotor shaft 2 operatively connected to a generator (not shown) is rotatably provided on the top of the pole 1. Three arms 3 extending radially in the horizontal direction are provided near the upper and lower portions of the vertical rotor shaft 2, and straight airfoil blades 4 are supported between the pair of upper and lower arms 3 and 3, respectively. Yes. When these three blades 4 receive wind, the wind turbine including the vertical rotor shaft 2, the arm 3, and the blade 4 rotates integrally to generate power. For details on the principle and the like of the straight blade vertical axis wind power generation, see, for example, Japanese Patent No. 3368537.

  Each blade 4 is a slightly long metal structure extending in the vertical direction (see FIG. 1), and a cross section (transverse cross section) in a direction orthogonal to the longitudinal direction is formed into a blade cross-sectional shape similar to a streamline type. (See FIG. 6). In particular, as shown in FIG. 6, a metal girder 5 is provided inside the blade body 4 a constituting the skin portion of the blade 4 of the present embodiment. This metal girder 5 is a slightly long member having substantially the same length in the longitudinal direction of the blade body 4a, and a cross section (transverse section) in a direction perpendicular to the longitudinal direction is as if It is configured as a hollow tubular member having a substantially quadrangular shape such as "". The metal beam 5 functions as a reinforcing material for supplementing the mechanical strength of the blade body 4a.

[Blade manufacturing equipment]
2 and 3 show an outline of a blade manufacturing apparatus used in the present embodiment. As shown in FIGS. 2 and 3, this apparatus is composed of a lower mold 12 as a fixed press mold installed on a fixed base 11, a movable base 13 disposed above them, and a lower part thereof. An upper die 14 as a movable press die is provided. The upper mold 14 can move in the vertical direction together with the movable base 13 by a vertical drive mechanism (not shown), so that the upper mold 14 can approach and separate from the lower mold 12. The lower mold 12 and the upper mold 14 have shaping portions 12a and 14a for imparting a desired airfoil shape to a workpiece (workpiece). A pair of left and right workpiece support mechanisms 20 and 30 are provided on the fixed base 11 at the left and right positions of the lower mold 12.

  As shown in FIG. 2, the work support mechanism 20 on the left side includes a fixed seal 21 for sealing one end of a tubular member serving as a work, and a left-hand leveling support leg 23 for horizontally supporting the fixed seal 21. It has. The fixed seal 21 has a generally cylindrical shape, and its axial orthogonal cross section (transverse cross section) is circular. An annular step 21a for fitting one end of a hollow metal tube M4, which is a precursor for constituting the blade body 4a, is formed on the outer periphery of the fixed seal 21. Further, a fitting convex portion 21 b for fitting one end of the hollow metal beam 5 is provided at the tip end portion (right end portion in FIG. 2) of the fixed seal 21. The left-hand leveling support pedestal 23 that supports the base end portion (the left end portion in FIG. 2) of the fixed seal 21 is made of an elastic or shock-absorbing member such as a coil spring or a damper, and the workpiece and the fixed seal 21 are vertical. When the external force in the direction is received or the external force is released, the workpiece and the entire fixed seal 21 are allowed to move up and down accordingly.

  The right workpiece support mechanism 30 includes a movable seal 31 for sealing the other end of the tubular member serving as a workpiece, a drive cylinder 32 horizontally connected to the movable seal 31, and a right adjustment for horizontally supporting these. And a high support leg 33. Similar to the fixed seal 21, the movable seal 31 has a generally cylindrical shape, and its axial orthogonal cross section (transverse cross section) has a circular shape. An annular step 31a for fitting the other end of the hollow metal tube M4 serving as a precursor for constituting the blade body 4a is formed on the outer periphery of the movable seal 31. Further, a fitting convex portion 31b for fitting the other end of the hollow metal beam 5 is provided at the distal end portion (left end portion in FIG. 2) of the movable seal 31. The drive cylinder 32 is drive means for horizontally moving the movable seal 31 in the axial direction of the workpiece. The right-side height support leg 33 that supports the movable seal 31 and the drive cylinder 32 is configured in the same manner as the left-side height support leg 23, and when the workpiece and the movable seal 31 receive a vertical external force or the external force is released. In addition, the workpiece, the movable seal 31 and the entire drive cylinder 32 are allowed to move up and down accordingly.

  Further, a fluid passage 34 is provided inside the movable seal 31. The fluid passage 34 connects the inside of each of two types of hollow tubular members (5, M4) held between the fixed and movable seals 21 and 31 forming a pair of left and right to the pressure regulating pump mechanism 15. The pressure adjusting pump mechanism 15 not only supplies the liquid to the inside of each of the hollow tubular members (5, M4) from the outside, but also supplies the liquid to the inside of the tubular member (5, M4) while allowing the liquid pressure inside the tubular member to reach a predetermined level. Hydraulic pressure feedback control is performed so that the target pressure P1 is maintained.

[Blade manufacturing procedure]
Next, the manufacturing procedure of the metal straight airfoil blade 4 will be described. In addition, as a metal which comprises the metal girder material 5 and the blade body 4a described below, a general-purpose iron-based metal such as stainless steel, or a light metal such as aluminum or an alloy thereof can be used.

1. Preparation of Metal Girder First, a hollow metal girder 5 having a length corresponding to the length of the blade body 4a and having a substantially square cross section (in the present embodiment, a “B” shape) is prepared. (See FIG. 4). Such a metal beam 5 is obtained by hydraulic press molding. Specifically, as shown in FIG. 4, a hollow metal element tube (for example, straight metal pipe) M5 having a relatively long and circular cross section is selected as a starting material. The thickness of the metal pipe M5 is, for example, 0.2 mm. Both ends of the metal base tube M5 are sealed with an appropriate sealing material, and a liquid (for example, water) is filled therein. And by pressing the metal base tube M5 in a state where the liquid is filled therein, a substantially square cross-sectional shape is imparted thereto. According to such a hydraulic press molding, the hollow metal girder 5 having a substantially rectangular cross section can be easily manufactured with excellent dimensional accuracy.

2. Next, as shown in FIG. 2, the metal girder material 5 and the substantial deformation object are formed between the upper and lower molds in a state where the upper mold 14 is separated from the lower mold 12. A hollow metal tube M4 is disposed. The hollow metal tube M4 is a straight metal pipe that is relatively long and has a circular cross section, and has an inner diameter that can accommodate the metal beam 5 with a margin. The thickness of the metal tube M4 is substantially equal to the thickness of the metal beam 5, and is 0.2 mm, for example.

  The hollow metal beam 5 and the metal tube M4 are disposed between the upper and lower molds 14 and 12 in a state where the metal beam 5 is accommodated inside the metal tube M4. Specifically, the left end portions of the metal beam 5 and the metal tube M4 are externally fitted to the fitting convex portion 21b and the annular step 21a of the fixed seal 21, respectively, and then the movable seal 31 is fixed to the fixed seal 21 by the drive cylinder 32. The right end portions of the metal beam 5 and the metal tube material M4 are externally fitted to the fitting convex portion 31b and the annular step 31a of the movable seal 31, respectively. In this way, fixed and movable seals 21 and 31 are attached to both ends of each of the metal beam member 5 and the metal tube member M4 to seal each end opening, so that the metal beam member 5 is made of metal as shown in FIG. Both members (5, M4) are horizontally supported while floating inside the tube material M4. In this case, the lower surface side of the metal tube M4 may be slightly lifted from the lower mold 12 or may be placed in contact with the lower mold 12.

3. Hydraulic press working After the metal girder 5 and metal pipe M4 are attached to the blade manufacturing apparatus, a liquid (for example, water) is supplied from the pressure regulating pump mechanism 15 to the inside of the metal girder 5 and metal pipe M4 via the fluid passage 34. At the same time, the pressure control pump mechanism 15 adjusts the fluid pressure inside the metal beam 5 and the metal tube M4 to a predetermined target pressure P1 exceeding the atmospheric pressure. This target pressure P1 is a pressure value at which deformation of the metal tube M4 cannot occur only by liquid pressure while considering the material and thickness of the metal tube M4, and is set in a range of, for example, 0.1 MPa to 30 MPa. The The pressure adjusting pump mechanism 15 performs hydraulic pressure control so that the internal pressures of the metal beam 5 and the metal tube material M4 maintain the target pressure P1 even during the press forming described below.

  Subsequently, as shown in FIG. 3, the metal pipe material M <b> 4 is press-molded by pressing the upper mold 14 toward the lower mold 12 (mold closing). At this time, the press pressure by both dies is preferably in the range of 50 to 300 MPa. As a result of this press work, the cross section approximates a streamline shape at the central portion excluding the vicinity of both ends in the longitudinal direction of the metal tube M4 to which the fixed and movable seals 21 and 31 are attached by the upper and lower shaped shaping portions 12a and 14a. The airfoil shape is applied (see FIG. 6).

  Even when the upper and lower molds are joined or closest to each other by closing the mold, the shaped parts 12a and 14a of the lower mold and the upper mold only press-mold the metal tube M4 into a desired airfoil shape, Almost no forming action is exerted on the metal beam 5 in the tube M4. However, in the blade body 4a after being formed into a desired airfoil shape by press working, the metal girder 5 is tightly (or pressure-bonded) between the two opposing walls 41 and 42 constituting the blade body 4a. Thus, the positioning and fixing of the metal beam 5 in the blade body 4a is performed (see FIG. 6).

4). Processing after press working When shaping by pressing is completed, the liquid is discharged from the molded product and the molded product is removed from the blade manufacturing apparatus (unmolding). Then, of the molded product, both end portions to which the fixed and movable seals 21 and 31 are attached and which have not undergone substantial press molding are cut off from the main body portion. Thereby, the straight airfoil blade 4 as the final product is obtained.

[Operation and effect of this embodiment]
According to the blade manufacturing procedure of the present embodiment, a hollow metal beam 5 and a liquid are contained in a hollow metal tube M4 as a precursor for constituting the blade body 4a. The metal tube material M4 is formed into a desired airfoil shape by pressing. In the press working in a state where the fluid is filled in the inside of the metal tube M4, the liquid uniformly applies pressure to the entire inside of the metal tube M4, so that the metal tube M4 can be pressed without causing unintentional wrinkles or crushing. A desired airfoil shape matching the shape of (12, 14) is formed.

  Further, since the liquid is filled in and out of the hollow metal beam 5 housed inside the metal tube M4, the inner surface and the outer surface of the metal beam 5 are subjected to the same pressure during the press working. Accordingly, even if the metal pipe M4 is pressed by the press die (12, 14), the metal girder 5 is not substantially deformed, and the hollow metal girder 5 having a substantially rectangular cross section is directly inside. In a state of being incorporated into the metal tube M4, the metal tube material M4 is formed into a desired airfoil shape.

  According to this embodiment, since the hollow metal girder 5 as a reinforcing material is internally provided in the blade body 4a, the rigidity of the blade 4 can be increased while reducing the weight. Further, in the manufacturing process, the metal beam 5 can be fixed in the blade body 4a and integrated with each other. Therefore, it is possible to manufacture the blade 4 which is not easily broken and has excellent shape and dimensional accuracy.

  According to this embodiment, both the blade body 4a and the metal girder 5 are generally made of a metal material that is less expensive than fiber reinforced resin (FRP). Further, in the case of the FRP blade, it is necessary to bond the two opposing walls 41 and 42 together by bonding. However, in this embodiment, plastic integrated processing of a hollow metal material using a press die (12, 14) is performed. Since it is based, it is possible to significantly reduce the number of manufacturing steps, the manufacturing time, and the manufacturing cost as compared with the conventional example using FRP. Therefore, according to the present embodiment, the blade 4 for a straight blade vertical axis wind power generator can be manufactured at a lower cost and more efficiently than the conventional one.

  Hereinafter, various modifications of the embodiment will be described.

  [Modification]: In the above embodiment, the metal girder 5 inside the blade 4 is simply narrowed (or simply crimped) between the two opposing walls 41 and 42 constituting the blade body 4a. Were positioned and fixed. Instead of this, an engagement structure between the blade body 4a and the metal beam 5 as shown in FIG. FIG. 7 is an enlarged view of an alternative structure of two portions surrounded by a two-dot chain line in FIG. The structure shown in FIG. 7 can be formed at the same time as the mold is closed in the hydraulic press. That is, for each of the lower mold shaped portion 12a and the upper mold shaped portion 14a, inward projections or ridges 43 projecting inwardly are formed on a part of the opposing walls 41 and 42 of the blade body 4a. Protrusions or ridges for application are provided. By applying hydraulic press processing to the metal tube M4 using the upper and lower molds 12, 14 having such protrusions or protrusions, as shown in FIG. Are provided with inward protrusions or ridges 43, and these inward protrusions or ridges 43 bite into the constituent walls of the metal girder 5, and the constituent walls are locally recessed. In this way, the inward projections or ridges 43 of the opposing walls 41 and 42 of the blade body 4a are closely engaged with a part of the constituent walls of the metal girder 5 that are recessed by the protrusions. Due to the close engagement relationship between the inward projections or ridges 43 and the concave constituent walls of the metal beam member 5, the metal beam member 5 is securely fixed inside the blade, and the displacement of the metal beam member 5 is almost permanent. Is prevented. In addition, also in the modified example of FIG. 7, the cross-sectional shape of the metal girder 5 is continuously maintained in a substantially square shape from beginning to end. That is, even if a part of the constituent wall of the metal beam member 5 may be recessed for the purpose of engaging with the inward projection or the protrusion 43, the recess (deformation) is the cross-sectional shape of the metal beam member 5. Is not forced to make substantial changes.

  [Modification]: As shown in FIG. 8, a plurality of metal beams 5 may be disposed in the blade body 4a.

  [Modification]: In the above-described embodiment, each end of the metal tube M4 is externally fitted to each of the fixed seal 21 and the movable seal 31. However, the metal pipe M4 in an externally fitted state is not limited thereto. The end portion may be clamped and fixed from the periphery using, for example, a band-shaped clamp (not shown). By performing such additional tightening and fixing, it is ensured that the metal tube M4 and the like are detached from the fixed or movable seals 21 and 31 when the hydraulic pressure P1 is applied to the metal tube M4 and / or when the mold is closed. Can be prevented.

  [Modification]: After the lower mold 12 and the upper mold 14 are joined or brought closest to each other by the mold closing operation, the internal pressure of the product stored in the mold is changed from P1 (P1 = 0.1 to 30 MPa) to P2 (for example, P2 = 50 to 200 MPa), and then the product may be removed from the mold. By increasing the hydraulic pressure to P2 before removing the mold, the unintentional dent is eliminated, and a blade product having a shape that exactly matches the mold shape can be obtained with certainty.

  [Modification]: As for the hollow metal girder 5 having a substantially rectangular cross section, as shown in FIG. 9, ribs 51 for reinforcing strength may be provided in advance on one or a plurality of side surfaces thereof. . It is preferable that a plurality of reinforcing ribs 51 are arranged at predetermined intervals along the longitudinal direction of the metal beam member 5, and each reinforcing rib 51 is in a direction orthogonal to the longitudinal direction of the metal beam member 5. It is preferable that it extends. The presence of the reinforcing rib 51 dramatically increases the bending rigidity and other strength characteristics of the metal beam 5. The reinforcing rib 51 is easily formed by, for example, bulging a part of the tube wall of the metal base tube 5 from the inside together with the liquid metal forming of the hollow metal base tube 5. be able to.

The perspective view which shows the outline of the windmill of a linear wing | blade vertical axis type wind power generator. The schematic longitudinal cross-sectional view at the time of mold opening of a blade manufacturing apparatus. The schematic longitudinal cross-sectional view at the time of mold closing of a blade manufacturing apparatus. The schematic cross-sectional view which shows the outline | summary of the preparation procedure of a metal girder. The schematic cross-sectional view which shows the arrangement | positioning relationship between the metal pipe material before a press work, and a metal girder. The schematic cross-sectional view of the braid | blade obtained by press work. The partial expanded sectional view of the example of a change regarding the engagement structure of a metal girder and a braid | blade main body. FIG. 7 is a schematic cross-sectional view corresponding to FIG. 6 showing a modification example. The fragmentary perspective view which shows the example of a change of a metal girder.

Explanation of symbols

  4 ... Straight blade type blade, 4a ... Blade body, 5 ... Metal girder, 12 ... Lower die (fixed press die), 14 ... Upper die (movable press die), 21, 31 ... Fixed and movable seal (seal means) 41, 42 ... opposing walls constituting the blade body, 43 ... inward projections or protrusions, M4 ... hollow metal tube, M5 ... hollow metal element tube.

Claims (6)

A girder preparation process for preparing a hollow metal girder having a substantially rectangular cross section,
An arrangement step of accommodating and arranging the hollow metal girder inside a hollow metal tube,
A fluid filling step of sealing both ends of a hollow metal pipe containing the hollow metal beam and filling the fluid into the hollow metal beam and the metal pipe; and
By applying a pressing process to the metal pipe material containing the metal beam material and fluid inside using a press die, the metal pipe material can be formed without forcing a substantial change in the cross-sectional shape of the metal beam material. And a hydrostatic pressing step for providing a blade shape whose cross section is similar to a streamline shape.   In the fluid pressure pressing step, the pressure of the fluid filled in the hollow metal tube is maintained at a pressure value (P1) at which the metal tube cannot be expanded or deformed only by the fluid pressure. The manufacturing method of the braid | blade for wind-hydraulic power generation of Claim 1.   In the girder preparation step, both ends of a hollow metal base tube serving as a starting material are sealed, and a fluid is filled in the metal base tube, and the metal base tube in a state of containing the fluid is formed. And applying a press working to the metal base tube to provide a shape having a substantially square cross section, and preparing a hollow metal girder having a substantially square cross section. The method for manufacturing a blade for wind-hydraulic power generation according to claim 1 or 2.   In the fluid pressure pressing step, inward projections or ridges are simultaneously formed on a part of a wall constituting the blade body to which the airfoil shape is imparted, and the inward projections or ridges are formed on the metal girder. The method for manufacturing a blade for wind-hydraulic power generation according to any one of claims 1 to 3, wherein a part of a wall to be configured is bitten.   After the fluid pressure pressing step, re-applying the pressure in the airfoil-shaped blade body to a pressure value (P2) higher than a pressure value (P1) that does not allow the metal tube material to expand or deform. The method for manufacturing a blade for wind-hydraulic power generation according to any one of claims 2 to 4, further comprising a pressing step.   6. The straight blade vertical axis feng shui according to any one of claims 1 to 5, wherein in the fluid pressure pressing step, a straight airfoil shape having a transverse cross section approximate to a streamline shape is imparted to the metal tube material. A method of manufacturing a blade for power generation.

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