JP6594192B2 - Wing production method - Google Patents

Description

  The present invention relates to a blade manufacturing method for manufacturing a blade used for a stationary blade or the like of a steam turbine.

  Conventionally, as a blade, a stationary blade of a steam turbine in which a biasing member is provided in a hollow portion defined inside a blade body is known (for example, see Patent Document 1). This stationary blade combines a ventral member and a back member, and welds and joins a front edge portion and a rear edge portion, thereby forming a blade body in which a cavity portion is defined.

  Further, as a method for manufacturing a turbine blade, a method for manufacturing a turbine blade using a three-dimensional additive manufacturing technique is known (for example, see Patent Document 2).

JP2015-124717A JP2015-117626A

  However, since the stationary blade of the steam turbine of Patent Document 1 welds the front edge portion and the rear edge portion of the blade body, the performance of the stationary blade may vary depending on the quality of the welding. Further, in Patent Document 2, although a turbine blade is manufactured by a three-dimensional additive manufacturing technique, since it is not a configuration in which an urging member is provided inside, manufacturing a stationary blade as in Patent Document 1 is not possible. Have difficulty.

  Then, this invention makes it a subject to provide the manufacturing method of the wing | blade which can manufacture the wing | blade with stable quality.

  The present invention relates to a wing manufacturing method for manufacturing a wing, wherein the wing includes a wing body in which a hollow space is formed, and an elastic member provided in the hollow space of the wing body. The member has a fixed portion fixed to the inner surface of the wing body, and a contact portion that contacts and presses the inner surface of the wing body, and by means of a three-dimensional additive manufacturing method, the elastic member, A first shaping step for producing a partial wing by integrally shaping the fixed portion of the wing body to which the fixing portion of the elastic member is fixed; and after the first shaping step, the elastic member for the partial wing A constraining step of constraining the wing body in a contracted state, and after the constraining step, a three-dimensional additive manufacturing method is used to integrally mold the remaining remaining portion of the wing body with respect to the partial wing. A second modeling step of releasing the restraint state and manufacturing the wing; Characterized in that it comprises.

  According to this structure, the wing | blade which accommodates an elastic member inside can be manufactured by a three-dimensional additive manufacturing method. For this reason, since it is not necessary to perform welding or the like, it is possible to suppress variations in the performance of the blade, and thus it is possible to stabilize the quality of the blade.

  In the restraining step, it is preferable that the restraining belt is wound around the partial wings to contract the elastic member of the partial wings.

  According to this configuration, the elastic member of the partial wing can be easily contracted using the restraining belt. As a method of winding the restraint belt, there are a method in which the restraint belt is wound around the entire circumference of the partial wing, and a method in which the restraint belt is wound around a portion where the elastic member of the partial wing is provided.

  Further, the wing body has a ventral side part that is a part on the flank side and a back side part that is a part on the back side of the wing, and in the first modeling step, as the fixing part of the wing body, Preferably, the ventral site is modeled, and in the second modeling process, the back side site is modeled as the remaining site of the wing body.

  According to this configuration, in the first modeling process, it is possible to form a partial wing in which the elastic member and the ventral part are integrated, and in the second modeling process, the wing in which the partial wing and the dorsal part are integrated. Can be formed.

FIG. 1 is a cross-sectional view showing a stationary blade of a steam turbine manufactured by the blade manufacturing method according to the present embodiment. Drawing 2 is an explanatory view of an example about the manufacturing method of the wing concerning this embodiment. Drawing 3 is an explanatory view of an example about the manufacturing method of the wing concerning this embodiment. FIG. 4 is an explanatory diagram of an example related to the method of manufacturing a wing according to the present embodiment.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined, and when there are a plurality of embodiments, the embodiments can be combined.

[Embodiment]
FIG. 1 is a cross-sectional view showing a stationary blade of a steam turbine manufactured by the blade manufacturing method according to the present embodiment. FIG. 2 to FIG. 4 are explanatory diagrams of an example relating to the method for manufacturing a wing according to the present embodiment.

  The blade manufactured by the blade manufacturing method of the present embodiment is applied to the stationary blade 1 of the steam turbine, for example. In addition, in this embodiment, although applied to the stationary blade 1 of a steam turbine, it is not specifically limited, You may apply to another blade. First, prior to the description of the manufacturing method of the stationary blade 1, the stationary blade 1 will be described with reference to FIG.

  FIG. 1 is a cross-sectional view taken along a plane orthogonal to the longitudinal direction of the stationary blade 1. The stationary blade 1 includes a blade body 11 and an elastic member 12 provided inside the blade body 11 and is integrally formed by a three-dimensional additive manufacturing method.

  The wing body 11 has a ventral region 21 and a dorsal region 22, and a hollow space 25 is formed therein. The outer side of the ventral region 21 is a high-pressure surface side where the steam flowing into the steam turbine has a high pressure, and the inner surface side is a surface in contact with the hollow space 25. And the abdominal part 21 is formed in the curved surface which becomes convex from the outer surface side to the inner surface side. The outer surface side of the back side portion 22 is a low pressure surface side where the steam flowing into the steam turbine has a low pressure, and the inner surface side thereof is a surface in contact with the hollow space 25. And the back part 22 is formed in the curved surface which becomes convex from the inner surface side to the outer surface side. At this time, the curve (warp) of the ventral region 21 and the curve (warp) of the dorsal region 22 are different.

  The ventral region 21 and the dorsal region 22 are connected to each other at a front edge 23 serving as an upstream region and a rear edge 24 serving as a downstream region in the direction of steam flow. In the wing body 11 configured as described above, a space surrounded by the ventral region 21 and the dorsal region 22 is defined as a hollow space 25.

  The elastic member 12 is provided in the hollow space 25 and is provided from the front edge side to the rear edge side of the hollow space 25. The elastic member 12 includes a fixed portion 27, a contact portion 28, and a connecting portion 29. The fixing portion 27 is located at the center between the end portion on one side (front edge side) and the end portion on the other side (rear edge side) of the elastic member 12, and the inner surface of the ventral region 21 of the wing body 11. It is a part fixed to. The fixing portion 27 is integrated with the wing body 11. The contact portions 28 are provided at both ends of the elastic member 12 and are portions that contact the inner surface of the back portion 22 of the wing body 11. The contact portion 28 is provided following the shape of the inner surface of the back portion 22. The connecting portion 29 is provided between the fixed portion 27 and the contact portions 28 on both sides, and connects the fixed portion 27 and each contact portion 28 respectively.

  In the stationary blade 1 configured as described above, the elastic member 12 presses from the inner surface of the blade body 11 toward the outer surface. For this reason, when the stationary blade 1 vibrates, the contact portion 28 of the elastic member 12 rubs against the inner surface of the blade body 11 to attenuate the vibration of the stationary blade 1, thereby suppressing the vibration of the stationary blade 1. .

  Next, with reference to FIGS. 2 to 4, a method for manufacturing the stationary blade 1 will be described. In this manufacturing method, the first modeling step S1 shown in FIG. 2, the restraint step S2 shown in FIG. 3, and the second modeling step S3 shown in FIG. 4 are performed in order.

  In the first modeling step S1, as shown in FIG. 2, the elastic member 12 and the ventral portion 21 of the wing body 11 to which the fixing portion 27 of the elastic member 12 is fixed are integrated by a three-dimensional layered manufacturing method. A partial stator blade (partial blade) 30 is manufactured by modeling. That is, in the first modeling step S1, the partial stationary blade 30 is manufactured using a three-dimensional additive manufacturing machine. At this time, since the elastic member 12 is modeled in a state before elastic deformation, the elastic member 12 is positioned outside the inner surface of the back portion 22 formed in a subsequent process. Moreover, in 1st modeling process S1, the elastic member 12 is modeled so that the spring force after elastic deformation may turn into a predetermined spring force.

  In the restraining step S2, as shown in FIG. 3, the elastic member 12 of the partial stationary blade 30 is restrained in a contracted state. In the restraining step S <b> 2, a plurality of restraining belts 32 are used, and the plurality of restraining belts 32 are arranged side by side with a predetermined interval in the longitudinal direction of the partial stationary blade 30. Each of the restraining belts 32 is wound around the partial stationary blade 30 to contract the elastic member 12 of the partial stationary blade 30 to the ventral region 21. At this time, the elastic member 12 is contracted by the plurality of restraining belts 32 so as to be positioned on the inner side of the inner surface of the back side portion 22 formed in a subsequent process. Here, as shown in FIG. 3, each restraint belt 32 is wound around the entire circumference of the partial stationary blade 30.

  In the second modeling step S3, as shown in FIG. 4, the constrained partial stationary blade 30 and the back side portion 22 which is the remaining remaining portion of the wing body 11 are integrally molded by a three-dimensional layered modeling method. Meanwhile, the stationary state of the elastic member 12 is released, and the stationary blade 1 is manufactured. That is, in the second modeling step S3, the stationary blade 1 is manufactured using a three-dimensional layered modeling machine. Specifically, in 2nd modeling process S3, the back side site | part 22 is modeled toward the edge part of the other side from the edge part of the other side in the longitudinal direction of the stationary blade 1 (step S3a). And if the back side part 22 is modeled to the vicinity of the restraint belt 32, the restraint belt 32 located in the vicinity of the back side part 22 will be removed (step S3b). Thereafter, the back portion 22 is formed again from the one end in the longitudinal direction of the stationary blade 1 toward the other end (step S3c). The stationary blade 1 is manufactured by repeatedly performing steps S3a to S3c.

  As described above, according to the present embodiment, the stationary blade 1 that houses the elastic member 12 therein can be manufactured by the three-dimensional additive manufacturing method. For this reason, since it is not necessary to perform welding or the like, it is possible to suppress variations in the performance of the stationary blade 1, so that the quality of the stationary blade 1 can be stabilized.

  Further, according to the present embodiment, the elastic member 12 of the partial stationary blade 30 can be easily contracted using the restraining belt 32 in the restraining step S2.

  Moreover, according to this embodiment, in the 1st modeling process S1, the elastic member 12 and the ventral part 21 can be modeled integrally, and the partial stationary blade 30 can be formed, and in the 2nd modeling process S3, The stationary blade 30 can be formed by integrally forming the partial stationary blade 30 and the back portion 22.

  In the present embodiment, the shape of the contact portion 28 of the elastic member 12 to be modeled is a shape that follows the inner surface of the back side portion 22, but is not limited to this shape. In the first modeling step S1, since the three-dimensional additive manufacturing method is used, the contact portion 28 of the elastic member 12 can be formed into a complicated shape. For example, a plurality of point contacts or You may form in the uneven | corrugated shape which carries out a line contact.

  Further, in the present embodiment, the elastic member 12 of the partial stationary blade 30 is contracted using the restraining belt 32 in the restraining step S2, but, for example, using an apparatus separate from the three-dimensional additive manufacturing machine, The elastic member 12 of the partial stationary blade 30 may be contracted, and is not particularly limited.

  In the present embodiment, the restraining belt 32 is wound around the entire circumference of the partial stationary blade 30 in the restraining step S2, but at least the elastic member 12 of the partial stationary blade 30 may be contracted. For this reason, in restraint process S2, the restraint belt 32 may be wound around the site | part in which the elastic member 12 of the partial stationary blade 30 is provided, and the elastic member 12 of the partial stationary blade 30 may be contracted.

DESCRIPTION OF SYMBOLS 1 Stator blade 11 Blade | wing main body 12 Elastic member 21 Abdomen side part 22 Back side part 23 Front edge part 24 Rear edge part 25 Hollow space 27 Fixed part 28 Contact part 29 Connection part 30 Partial stator blade 32 Restraint belt

Claims (3)

In the method of manufacturing a wing for manufacturing a wing,
The wing
A wing body in which a hollow space is formed,
An elastic member provided in the hollow space of the wing body,
The elastic member has a fixed portion that is fixed to the inner surface of the wing body, and a contact portion that contacts and presses the inner surface of the wing body,
First modeling step of manufacturing a partial wing by integrally modeling the elastic member and the fixing portion of the wing body to which the fixing portion of the elastic member is fixed by a three-dimensional additive manufacturing method,
After the first modeling step, a restraint step of restraining the partial wing in a contracted state, and
After the restraining step, the restraint state of the elastic member is released while integrally shaping the remaining remaining part of the wing body with respect to the partial wing by a three-dimensional additive manufacturing method, and the wing is manufactured. A wing manufacturing method comprising: a second modeling step.   2. The blade manufacturing method according to claim 1, wherein in the restraining step, a restraint belt is wound around the partial wing to contract the elastic member of the partial wing. The wing body has a ventral part that is a part on the flank side, and a dorsal part that is a part on the back side of the wing,
In the first modeling step, the ventral site is modeled as the fixed site of the wing body,
3. The method for manufacturing a wing according to claim 1, wherein, in the second modeling step, the back side part is modeled as the remaining part of the wing body.

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