JP5276466B2 - Manufacturing method of laminated heat-resistant alloy sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a layered heat-resistant alloy plate capable of reliably preventing any defective joining at a peripheral edge of the plate. <P>SOLUTION: The method for manufacturing the layered heat-resistant alloy plate comprises a layering step of alternately layering heat-resistant sheet members and objects 10 for heat treatment constituted with a brazing filler metal 11 being held between heat-resistant sheet members 12 and plates, and a brazing step of heating the layered object 10 for heat treatment in a pressed state in the layering direction. In the layering step, the sheet members 12 are layered with a peripheral edge of each sheet member 12 being projected outside the object 10, the peripheral edge of each sheet member 12 is hanged downwardly at least in a heated condition, and the object 10 for heat treatment is covered by the sheet members 12 arranged in the vertical direction. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a method for producing a laminated heat-resistant alloy plate.

  A combustor such as a gas turbine or a jet engine is provided with a cooling structure made of a laminated heat-resistant alloy plate. This laminated heat-resistant alloy plate has, for example, a structure in which a groove-side surface of a fine groove plate provided with a fine groove and a cooling hole and a top plate provided with only a cooling hole are brazed with nickel. (For example, refer to Patent Document 1).

  Such a laminated heat-resistant alloy plate is placed in a vacuum vessel such as a hot press so that the narrow groove plate and the upper plate are covered with a nickel brazing material so as to cover the groove, and the groove is directed downward. A plurality of the heat-treated objects that have been placed are stacked, a load is applied in the stacking direction, and heat treatment is performed in an inert atmosphere or vacuum. At this time, in order to suppress the bonding between the heat treatment objects, a heat-resistant non-woven cloth containing alumina and silica is inserted between the heat treatment objects.

Japanese Patent Publication No. 6-67551

  However, in the heating by the heater provided on the inner wall surface of the hot press vacuum vessel, the peripheral side of the heat treatment object is more easily heated than the inner side, so in the conventional method for producing a laminated heat resistant alloy plate, There was a possibility that the brazing material melted at the peripheral edge would flow out between the narrow groove plate and the upper plate, resulting in poor bonding.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a laminated heat-resistant alloy plate that can surely prevent poor bonding at the peripheral edge.

The present invention employs the following means in order to solve the above problems.
The method for producing a laminated heat-resistant alloy plate according to the present invention includes a lamination step of alternately laminating a plurality of heat-resistant sheet members and heat treatment objects configured by sandwiching a brazing material between the plate materials, A brazing step of heating the laminated heat treatment object in a state of being pressed in the laminating direction, and in the lamination step, the sheet member in a state in which a peripheral portion of the sheet member protrudes outside the heat treatment object. The members are stacked, and at least a peripheral portion of the sheet member hangs down at the time of heating, and the heat treatment object is covered with the sheet member arranged vertically.

  In the present invention, since the heat treatment object is wrapped with the sheet member when heating in the brazing process, the temperature difference between the peripheral portion and the inner side of the heat treatment object can be reduced, and the entire heat treatment object is uniform. Stable brazing can be performed by simple heating.

  Moreover, the manufacturing method of the laminated heat-resistant alloy plate according to the present invention is characterized in that the sheet member used in the laminating step is formed by weaving long fibers.

  In the present invention, since the sheet member is formed by weaving long fibers, the sheet member is not easily broken and damaged even when drooping downward, and the sheet member is not easily powdered even when heated. For this reason, it is possible to increase the number of reuses after the heat treatment while suitably wrapping the heat treatment object during the heat treatment, and to suppress the manufacturing cost. Further, since the sheet member is less likely to be powdered by heating, it is only necessary to remove the sheet member after the heat treatment, and the work after the heat treatment can be facilitated under a good working environment.

The method for manufacturing a laminated heat-resistant alloy plate according to the present invention is a method for producing the laminated heat-resistant alloy plate, wherein the sheet member is pre-formed by twilling the long fibers.
According to the present invention, the density of the sheet member can be increased, and the load per fiber can be dispersed. Therefore, it is possible to equalize the concentrated load at the peripheral edge of the heat treatment object during pressing, and to improve the durability of the sheet member.

The method for manufacturing a laminated heat-resistant alloy plate according to the present invention is a method for producing the laminated heat-resistant alloy plate, wherein a plurality of the sheet members are laminated between the heat treatment objects.
This invention can further increase the pressure equalization during pressing.

  According to the present invention, it is possible to manufacture a laminated heat-resistant alloy plate while reliably preventing poor bonding at the peripheral edge.

It is a partial fracture outline figure showing the lamination heat-resistant alloy board manufactured by the manufacturing method of the lamination heat-resistant alloy board concerning one embodiment of the present invention. It is sectional drawing which shows the laminated heat resistant alloy plate manufactured by the manufacturing method of the laminated heat resistant alloy plate which concerns on one Embodiment of this invention. It is sectional drawing which shows the gas turbine in which the laminated heat-resistant alloy plate manufactured by the manufacturing method of the laminated heat-resistant alloy plate which concerns on one Embodiment of this invention is used. It is a flowchart which shows the manufacturing method of the laminated heat-resistant alloy plate which concerns on one Embodiment of this invention. It is explanatory drawing which shows the manufacturing method of the laminated heat-resistant alloy plate which concerns on one Embodiment of this invention. It is a partially expanded plan view which shows the sheet | seat member used in the manufacturing method of the laminated heat-resistant alloy plate which concerns on one Embodiment of this invention. It is a partially expanded plan view which shows the sheet | seat member used in the manufacturing method of the laminated heat-resistant alloy plate which concerns on one Embodiment of this invention. It is a partially expanded plan view which shows the modification of the sheet | seat member used in the manufacturing method of the laminated heat-resistant alloy plate which concerns on one Embodiment of this invention.

An embodiment according to the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the laminated heat-resistant alloy plate 1 produced by the method for producing a laminated heat-resistant alloy plate according to the present embodiment has a fine structure in which a plurality of fine grooves 2A and first cooling holes 2B are arranged. The groove plate 2, the second cooling hole 3 </ b> A is arranged, and the surface of the fine groove plate 2 on the fine groove 2 </ b> A side and the upper plate 3 brazed with nickel are provided.

  The narrow groove plate 2 has a plate thickness of about 0.5 to 7.0 mm. A plurality of narrow grooves 2A are arranged substantially in parallel on the surface of the narrow groove plate 2, and this surface functions as a cooling fin. The first cooling hole 2B and the second cooling hole 3A are arranged so as to be eccentric from each other when the upper plate 3 and the narrow groove plate 2 are brazed. The narrow groove plate 2 and the upper plate 3 are made of a nickel-based heat-resistant alloy such as Tomiloy (registered trademark) or Hastelloy (registered trademark).

The laminated heat-resistant alloy plate 1 needs to be cooled by being exposed to a high-temperature fluid such as the inner cylinder 6A, outer cylinder 6B, tail cylinder 6C of the combustor 6 included in the industrial gas turbine 5 shown in FIG. It is applied to members used in various places.
The shape of the laminated heat-resistant alloy plate 1 shown in FIG. 1 and FIG. 2 is an example, and the method for producing the laminated heat-resistant alloy plate of the present invention is to join at least a brazing material by brazing between the plate materials. If so, the present invention can be applied in the same manner, and can be applied to laminated alloy plates having various shapes depending on the application.

Next, a method for manufacturing the laminated heat-resistant alloy plate 1 according to this embodiment will be described.
As shown in FIGS. 4 to 6, the manufacturing method includes a stacking step of stacking a plurality of heat treatment objects 10 in a gravity direction in a vacuum chamber C in which an upper pressing portion P1 and a lower pressing portion P2 are arranged (S01). And a brazing step (S02) of these heat treatment objects 10.

  In the present embodiment, a nickel brazing material 11 processed into a sheet shape is laid on the upper surface of the upper plate 3 placed substantially horizontally, and the fine groove 2A side is further down on the fine groove. A stack of the plates 2 is used as a set of heat treatment objects 10. In the stacking step (S01), a plurality of sheet members 12 and heat treatment objects 10 are alternately stacked on the lower pressing portion P2. Here, in order to prevent welding with the upper side pressing member P1 and the lower side pressing member P2 which pressurize the heat processing target object 10 in the brazing process (S02) described later, the lowermost layer and the uppermost layer become the sheet member 12. Laminate to. A plurality of sheet members 12 may be laminated between the heat treatment objects 10.

The joining surface of the upper plate 3 and the narrow groove plate 2 is adjusted to a predetermined surface roughness so that the molten wax is uniformly arranged. As shown in FIG. 7, the sheet member 12 is formed by twilling long fibers 13 having heat resistance including Al ₂ O ₃ and SiO _2, and the peripheral portion protrudes outside the heat treatment object 10. Laminated. In addition, as the ratio of Al ₂ O ₃ and SiO ₂ of the long fibers 13 of the sheet member 12, for example, the former is selected to be about 80% and the latter is about 20%, but other ratios are also selected. It can be selected as appropriate. As the thickness of the long fiber 13, for example, about 5 to 10 μm is selected, but other lengths can be appropriately selected. Similarly, the mesh size of the long fibers 13 can be selected as appropriate. Moreover, the sheet | seat member 12 is set to the magnitude | size that each heat processing target object 10 is covered with what was arranged on the upper and lower sides, when the peripheral part protrudes from the heat processing target object 10 and hangs down below. . Here, it is preferable that the hardness of the sheet member 12 is adjusted so that the peripheral edge protruding from the heat treatment object 10 is not bent and the heat treatment object 10 is covered. The hardness of the sheet member 12 is suitably adjusted by selecting the material, thickness, and mesh size.

  In the brazing process (S02), the upper pressing portion P1 and the lower pressing portion P2 divide a uniform load of 0.01 to 0.4 MPa into small blocks having a predetermined load area with respect to the heat treatment object 10. Add. Next, the inside of the vacuum chamber C is set to an inert atmosphere or vacuum, and is heated at a temperature of 450 to 1200 ° C. for a predetermined time by a heater H provided on the inner wall surface of the vacuum chamber C. At this time, as described above, each of the heat treatment objects 10 is covered with the sheet members 12 arranged vertically, with the peripheral edge of the protruding sheet member 12 hanging downward.

  After the heat treatment, the laminated heat-resistant alloy plate 1 and the sheet member 12 brazed from the vacuum chamber C are taken out. The sheet member 12 is again used for brazing of another heat treatment object.

  According to the method for manufacturing the laminated heat-resistant alloy plate 1, since the heat treatment object 10 is wrapped in the sheet member 12 when heated by the heater H provided in the vacuum chamber C in the brazing step (S02), The temperature difference between the peripheral edge portion and the inner side of the heat treatment object 10 can be reduced. For this reason, the whole heat treatment target object 10 can be heated uniformly, the brazing material 11 can be melt | dissolved over the whole, and the stable brazing can be performed. In addition, as described above, when the heat treatment object 10 is covered with the sheet member 12, when the inside of the vacuum chamber C is set to an inert atmosphere or a vacuum, even if dust is present inside, It is possible to prevent dust from entering between the narrow groove plate 2 and the upper plate 3 to be joined.

  Further, since the sheet member 12 is formed by weaving the long fibers 13, the sheet member 12 is unlikely to be broken and damaged even when drooping downward, and the sheet member 12 is not easily powdered even when heated. For this reason, the number of reuses after the brazing step (S02) can be increased while the heat treatment object 10 is suitably wrapped during the brazing step (S02), and the manufacturing cost can be reduced. Further, since the sheet member 12 is less likely to be powdered by heating, it is only necessary to remove the sheet member 12 after the brazing step (S02), and the work after the brazing step (S02) can be easily performed in a good working environment. Can be. In addition, even if excess brazing material 11 flows out to the outside, the sheet member 12 in which the long fibers 13 are knitted is covered so that the flowing wax can be adsorbed between the long fibers 13. It is also possible to prevent the laminated heat-resistant alloy plate and furnace manufactured by the above from being soiled.

  Moreover, since the long fiber 13 is twilled to form the sheet member 12, the surface density of the sheet member 12 can be increased, and the load per long fiber can be dispersed. Therefore, the concentrated load at the corners of the heat treatment target object 10 can be dispersed and pressure-equalized at the time of pressing, and the durability of the sheet member 12 can be improved. Moreover, the sheet | seat member 12 can further raise the pressure equalization at the time of a press by being laminated | stacked between each heat processing target object 10 as mentioned above.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the sheet member 12 is made by twilling the long fibers 13, but the sheet member 12 is not limited to this and may be a plain woven sheet member 15 as shown in FIG. Further, although the long fibers constituting the sheet member 12 include Al ₂ O ₃ and SiO ₂ , the present invention is not limited to this, and long fibers having predetermined heat resistance such as carbon fibers may be used. Further, the sheet member 12 is not limited to the one woven with the long fibers 13 but may be one composed of short fibers or one bonded with a resin as a binder, and at least a peripheral portion protruding from the heat treatment object 10. What is necessary is just to be able to hang down and to cover the heat treatment object 10.

DESCRIPTION OF SYMBOLS 1 Laminated heat-resistant alloy plate 10 Heat processing target 11 Brazing material 12, 15 Sheet member 13 Long fiber

Claims (4)

A laminating step of alternately laminating a plurality of heat-resistant sheet members and a heat treatment object configured by sandwiching a brazing material between plate members;
A brazing step of heating the heat-treated object laminated in a state of pressing in the laminating direction;
With
In the laminating step, the sheet member is laminated in a state where a peripheral edge portion of the sheet member protrudes outside the heat treatment object, and the peripheral edge portion of the sheet member hangs down at least during heating, and the heat treatment object is A method for producing a laminated heat-resistant alloy plate, characterized by covering with the sheet members arranged above and below.   The method for producing a laminated heat-resistant alloy plate according to claim 1, wherein the sheet member used in the laminating step is formed by weaving long fibers.   The method for producing a laminated heat-resistant alloy plate according to claim 2, wherein the sheet member is formed by twilling the long fibers.   The method for producing a laminated heat-resistant alloy plate according to any one of claims 1 to 3, wherein a plurality of the sheet members are laminated between the heat treatment objects.

Images