JPH06201131A - Manufacture of wall material for combustor - Google Patents

Abstract

PURPOSE:To enhance the bonding strength of a pair of inner and outer plate type base materials and form an arbitrary configuration without deforming an air flow passage or damaging a bonding part while easily coping with the increase of the size of a device. CONSTITUTION:An air flow passage forming member 4, formed by laser working method, and a core 5, provided with the set spaces 6 of the air flow passage forming member, are sealed between a pair of mutually opposing inner and outer plate type base materials 1, 2 while both of the plate type base materials 1, 2 are integrated with the air flow passage forming member 4 and the core 5 by hydrostatic hot press (HIP) diffusion bonding method and after forming these materials so as to have a specified configuration, the core 5 is removed through chemical processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a wall material for a combustor used in a gas turbine or the like.

[0002]

2. Description of the Related Art In this type of combustor, a peripheral wall is formed as an inner / outer double wall, and a hollow structure having an air flow passage therein is formed. Conventionally, as shown in FIG. 6, a wall material for forming such a peripheral wall has a pair of inner and outer plate-shaped base materials 1 facing each other.
After the air flow path 104 is formed by partially leaving the air flow path forming member 103 on one of the inner surfaces of 01 and 102 by the photo-etching method, both plate-shaped base materials 10 are formed.
As shown in FIG. 7, 1 and 102 were joined and fixed by brazing and formed into a predetermined shape (for example, Japanese Patent Publication No. 63-33953).

[0003]

According to the conventional method for manufacturing a wall material for a combustor as described above, a pair of plate-shaped base materials 10 are provided.
Because 1,102 comrades are joined and fixed by brazing,
Since the bonding strength of the bonding portion is relatively low and the molding has to be performed with the air passage 104 formed inside, the molding cannot be performed in a complicated shape. That is, even if a simple shape such as a cylinder can be formed, there is a possibility that the air passage 104 may be deformed or crushed in a complicated shape with a restriction such as the vicinity of the opening of the combustor. , Difficult to mold.

Further, since the plate-like base materials 101 and 102 are joined and fixed to each other by brazing, if a high stress is applied to the joint portion during molding, the joint portion may be cracked or peeled off. However, it is impossible to form a complicated shape for such a reason. Furthermore, the air flow path 1
Since 04 is formed by the photo-etching method, the size of the base materials 101 and 102 is restricted by the size of equipment for photo-etching, and there is a problem that only relatively small ones can be manufactured.

The present invention has been made in order to solve such a problem, and enhances the bonding strength of a pair of plate-like base materials to improve their reliability, and a complicated and precise air flow path. It is an object of the present invention to provide a method of manufacturing a wall material for a combustor, which can be formed into an arbitrary shape that secures the above, and can be made larger.

[0006]

In order to achieve the above object, in the method for manufacturing a wall material for a combustor according to the present invention, a pair of inner and outer plate-shaped base members facing each other is formed by a laser processing method. An air flow path forming member and a core having a set cavity of the air flow path forming member are enclosed, and both plate-like base materials are hot isostatically pressed together with the air flow path forming member and the core (hereinafter, It is characterized in that they are integrally joined by a diffusion joining method (referred to as HIP), they are formed into a predetermined shape, and then the core is removed by a chemical treatment.

[0007]

According to the present invention, a pair of plate-shaped substrates are
Since the joining is performed by the P diffusion joining method, the joining strength is enhanced as compared with brazing, and peeling of the joining portion is prevented. Moreover, since molding is performed with the core remaining between the pair of plate-shaped base materials, the air flow path is not deformed or crushed by the molding, and molding of a complicated shape is possible.
Moreover, it is possible to easily manufacture a wall material of an arbitrary size without the restriction on processing such as photo-etching equipment.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a method for manufacturing a wall material for a combustor according to the present invention before joining plate-shaped base materials.

In FIG. 1, first, a pair of inner and outer plate-shaped substrates 1 and 2 made of a heat resistant material and facing each other are prepared,
A large number of air flow path forming members 4 for forming an air flow path 3 (FIG. 4) between these two 1 and 2 are arranged under a predetermined array pattern. The air flow path forming member 4 is formed by a well-known laser processing method and has, for example, a triangular shape. A plate-shaped core 5 is arranged between the plate-shaped substrates 1 and 2. In this core 5, a set space 6 into which each of the air flow path forming members 4 is fitted is punched by a laser processing method. By adopting the above laser processing method, not only the air flow path forming member 4 but also the air flow path forming member having a more complicated shape can be formed with high accuracy.

After the air flow path forming member 4 and the core 5 are enclosed between the plate-shaped base materials 1 and 2, these are set in a vacuum, and then the plate is formed as shown in FIG. Substrate 1,2
Are vacuum-sealed on the four sides, and are joined together with the air flow path forming member 4 by the HIP diffusion joining method. Since this HIP diffusion bonding method is characterized by high temperature and isotropic high pressure, the bonding parts of the plate-shaped base materials 1 and 2 are integrated as shown in FIG. The joint strength can be increased. Since the core 5 is subjected to high temperature and isotropic high pressure at the time of HIP diffusion bonding, it is preferable to select a constituent material having a coefficient of thermal expansion similar to that of the plate-shaped substrates 1 and 2.

After that, parts in which the above-mentioned plate-shaped base materials 1 and 2 are integrated are molded in conformity with each portion of the peripheral wall of the combustor (FIG. 4). After this molding, if the core 5 between the plate-shaped substrates 1 and 2 is chemically treated, for example, removed by using a solvent,
The wall material having the air flow path 3 is manufactured. At this time, the solvent for the core 5 is
It goes without saying that a material that does not react with 2 and the air flow path forming member 4 is selected. At the time of molding, the plate-shaped base materials 1 and 2
Since the process is performed with the core 5 left therebetween, there is no risk of the air passage 3 shown in FIG. 5 being deformed or crushed. Therefore, even if the shape is complicated, such as in the vicinity of the opening of the combustor with a throttle, it can be easily and properly molded.

By shaping the air flow path forming member 4 by the laser processing method, the shape of the air flow path 3 can be made complicated and more precise. Further, the size is not limited by the processing equipment as in the photo etching method, and the wall material of any size can be easily manufactured.

[0013]

As described above, according to the present invention, an air flow path forming member for forming a predetermined air flow path between a pair of inner and outer plate-like base materials, and this air flow path forming member. Since a core having a set space for fitting with is sealed and integrated by the HIP diffusion bonding method, the reliability of the bonding strength can be increased, and further, before the core is chemically removed. Since it is molded into a predetermined shape, it is possible to prevent cracks and the like from occurring at the joint during molding, and there is no risk of the air passage deforming or crushing, and molding of complicated shapes is possible. Therefore, an arbitrary size can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a method for manufacturing a wall material for a combustor according to the present invention before joining plate-shaped base materials.

FIG. 2 is a perspective view showing a joined state of the plate-shaped base materials in the example.

FIG. 3 is a partial cross-sectional view showing, in an enlarged manner, a joined state of the plate-shaped substrates in the example.

FIG. 4 is a perspective view showing a state in which the plate-shaped base materials in the embodiment are molded after being joined.

FIG. 5 is a partially cutaway perspective view showing the hollow structure of the wall material obtained by the manufacturing method of the embodiment.

FIG. 6 is a perspective view of a conventional method for manufacturing a wall material for a combustor before joining plate-shaped base materials.

FIG. 7 is a perspective view showing a conventional combustor wall material.

[Explanation of symbols]

 1, 2 plate-like base material 3 air flow path 4, 14, 24 air flow path forming member 5 core 6 void

Claims (1)

[Claims] 1. An air flow path forming member formed by a laser processing method and a core having a set cavity of the air flow path forming member are enclosed between a pair of inner and outer plate-shaped substrates facing each other. Then, together with the air flow path forming member and the core, the both plate-like base materials are integrally joined by a hot isostatic press diffusion bonding method, and after molding these into a predetermined shape, the core is chemically treated. A method for producing a wall material for a combustor, which comprises removing the wall material.