JP2003117632A - Method of manufacturing stock for transition piece used for gas turbine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a stock 1 for a transition piece used for a gas turbine with a small amount of material. SOLUTION: In the method for manufacturing the stock for the transition piece used for the gas turbine, a circular ring 2 is manufactured by performing the swaging, drilling, hole-expansion forging, and ring-rolling of a billet, a part for forming a corner of the circular ring 2 is partially heated, and the heated part is bent by using an inner forging die 32 corresponding to the inner shape of the corner and an outer forging die 42 corresponding to the outer shape of the corner. Then, the part is subjected to heat treatment such as solid solution heat treatment, and further machined.

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 material for a transition piece used in a gas turbine, and more specifically, for a transition piece used in a gas turbine formed by bending a circular ring manufactured by forging or the like. The present invention relates to a method of manufacturing a material.

[0002]

2. Description of the Related Art A transition piece material used for a gas turbine (hereinafter referred to as "transition piece material") is a deformed quadrangular ring as shown in FIG. Conventionally, this transition piece material has been manufactured by cutting it from a metal plate. However, since this transition piece material is usually made of a high Ni alloy such as a Ni-based super heat resistant alloy, if cut and manufactured from a metal plate, most of the material (about three quarters) is wasted.
The drawback is that the material costs are very high.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a material for a transition piece from a small amount of material.

[0004]

In order to solve the above problems, in the method for producing a material for a transition piece of the present invention, a circular ring is formed by upsetting a billet, drilling, hole expanding forging, and ring rolling. Manufacture and partially heat the part that becomes the corner of this circular ring, and bend this heated part using an inner forging die that corresponds to the inner shape of the corner and an outer forging die that corresponds to the outer shape of the corner After processing, heat treatment such as solution heat treatment,
Further machining is required.

Further, in the method for manufacturing a material for a transition piece of the present invention, a cylinder is manufactured by upsetting a billet, drilling, forging for expanding, and ring rolling.
This cylinder is cut to produce a plurality of circular rings, the corners of each of these circular rings are partially heated, and this heated portion is used as an inner forging die and a corner corresponding to the inner shape of the corner. Bending is performed by using an outer forging die corresponding to the outer shape of, and then heat treatment such as solution heat treatment is performed, and further machining is performed.

[0006]

In the method for producing a material for a transition piece of the present invention, the corner portion of a circular ring produced by forging from a billet, ring rolling or the like is bent using an inner forging die and an outer forging die, so that the material is wasted The cost of the material can be significantly reduced because there is only a small area. Further, another method for producing a material for a transition piece of the present invention is forging from a billet, a cylinder is produced by ring rolling, etc., and a plurality of circular rings are produced by cutting the cylinder, so that a large number of circular rings are produced. It can be manufactured at low cost. Therefore, the cost of the transition piece material can be further reduced.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a method for manufacturing a material for a transition piece of the present invention will be described in detail with reference to the drawings. FIG. 2 is a process diagram showing an embodiment of a method for manufacturing a material for a transition piece of the present invention, FIG. 3 is a conceptual diagram of an embodiment of hole expanding forging, and FIG. 4 is a concept of an embodiment of ring rolling. FIGS. 5 to 8 are explanatory views for explaining an example of the bending method.

An embodiment of the method for producing a material for a transition piece of the present invention is carried out by the following steps. First, a cylindrical billet as shown in FIG. 2A is set up as shown in b, drilled as shown in c, expanded forging as shown in d, and as shown in e. Ring rolling is performed to form a ring or cylinder with further expanded holes. Of these, the hole-expansion forging is performed by turning the ring while forging the ring by moving the anvil vertically and moving the anvil up and down by placing the core metal placed in the perforated ring on the core metal stand as shown in FIG. be able to.

Ring rolling is performed by rolling the ring between the mandrel and the king roll with a ring mill consisting of a mandrel, a king roll and a pair of cone rolls as shown in FIG. Can be increased and then rolled by a cone roll so as to have a predetermined width.

The circular ring 2 manufactured by the above method can be bent in the next step as it is, but the cylinder manufactured by the above method is cut into a plurality of circular rings and bent in the next step. Will be done.

The circular ring 2 manufactured by the above method is shown in FIG.
The portion of the circular ring 2 frame heating, high frequency heating, heating by a furnace heating or the like, placed on the inside for forging die 3 _1, is pressed against the outer forging mold 4 ₁ from above, as shown in FIG. 6 bending Perform processing. Thereafter, the portion of the circular ring 2 is heated by the frame heating heat or the like, placing a circular ring 2 on the inner side for forging die 3 ₁ to the front and back of the circular ring 2 Conversely,
Performs bending by pressing the outer forging mold 4 ₁ working from the top as shown in FIG. 6, to those of the shape as shown in FIG.

Next, using an inner forging die 3 ₂ and an outer forging die 4 ₂ as shown in FIG. 7, the portion of the circular ring 2 is heated by frame heating or the like to form the inner forging die 3 ₂ . surmounted performs bending by pressing the outer forging type 4 ₂ working from the top. Thereafter, the portion of the circular ring 2, as shown in FIG. 8 and heated by the frame heating etc., placing a circular ring 2 on the inner side for forging die 3 ₁ to the front and back of the circular ring 2 Conversely,
Performing bending by pressing the outer forging mold 4 ₁ from above, as shown in FIG. Through these steps, the transition piece material 1 is molded from the circular ring 2.

After that, the bending-processed material for the transition piece is subjected to heat treatment such as solution heat treatment,
It is made into a material for transition piece by machining the surroundings.

[0014]

[Effect] The method for producing a material for a transition piece according to the present invention, which has the above-described structure, has an excellent effect that the amount of the material used is about one-fourth that of the conventional method.

[Brief description of drawings]

FIG. 1 is a plan view of an example of a transition piece manufactured by the method for manufacturing a transition piece of the present invention.

FIG. 2 is a process drawing showing an embodiment of a method for manufacturing a material for a transition piece of the present invention.

FIG. 3 is a conceptual diagram of hole expanding forging.

FIG. 4 is a conceptual diagram of ring rolling.

FIG. 5 is an explanatory diagram of a state in which bending is started.

FIG. 6 is an explanatory view showing a state where the first bending-down process is performed.

FIG. 7 is an explanatory diagram showing a state before performing a third bending-down process.

FIG. 8 is an explanatory diagram showing a state in which the final bending-down process is performed.

[Simple explanation of symbols]

1 Material for transition piece used for gas turbine 2 Circular ring 3 ₁ , 3 ₂ Inner forging die 4 ₁ , 4 ₂ Outer forging die

Claims (2)

[Claims] 1. A circular ring is manufactured by upsetting a billet, drilling, hole-expanding forging, and ring rolling, and a corner portion of the circular ring is partially heated. Used in gas turbines characterized by bending using an inner forging die corresponding to the inner shape of the corner and an outer forging die corresponding to the outer shape of the corner, then heat-treating, and further machining. Method for manufacturing transition piece material. 2. A cylinder is formed by upsetting a billet, drilling, hole expanding forging, and ring rolling, and the cylinder is cut to produce a plurality of circular rings. Partly heated the part that becomes, this heated part is bent using an inner forging die corresponding to the inner shape of the corner and an outer forging die corresponding to the outer shape of the corner, and then heat treated, A method for manufacturing a material for a transition piece used for a gas turbine, which is characterized by further machining.