Heat treatment method
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsKazutoshi Yoko, Hiroko Kitamoto, Shimpei Okayasu, Hiroki Takagi
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Abstract
A heat treatment method of an impeller includes a heat treatment preparation process of arranging the impeller within a vacuum furnace, an impeller covering process of covering an outer peripheral surface of the impeller in a circumferential direction by a heat uniformizing jig made of a radiation conversion material which radiates transferred heat as radiant heat, and a heat treatment process including a heating process and a cooling process in which heat treatment is performed by heating or cooling the impeller covered with the heat uniformizing jig from the periphery using a heater.
Claims9
A heat treatment method of a disc-shaped treatment target material, the heat treatment method comprising:
- a treatment target material covering process of covering an outer peripheral surface of the treatment target material in a circumferential direction with a covering body made of a radiation conversion material which radiates transferred heat as radiant heat;
- and
- a heat treatment process of performing heat treatment by heating or cooling the treatment target material covered with the covering body from the periphery,
- wherein:
- the treatment target material is an impeller having an axial hole into which a rotary shaft is capable of being inserted;
- the heat treatment method further comprises a first insertion process of inserting an axial hole insertion body made of the radiation conversion material into the axial hole;
- and
- the heat treatment process is performed in a state in which the axial hole insertion body is inserted into the axial hole.
A heat treatment method of a disc-shaped treatment target material, the heat treatment method comprising:
- a treatment target material covering process of covering an outer peripheral surface of the treatment target material in a circumferential direction with a covering body made of a radiation conversion material which radiates transferred heat as radiant heat;
- and
- a heat treatment process of performing heat treatment by heating or cooling the treatment target material covered with the covering body from the periphery,
- wherein:
- the treatment target material is an impeller having a passage therein;
- the heat treatment method further comprises a second insertion process of inserting a passage insertion body made of the radiation conversion material into the passage;
- and
- the heat treatment process is performed in a state in which the passage insertion body is inserted into the passage.
A heat treatment method of a disc-shaped treatment target material, the heat treatment method comprising:
- a treatment target material covering process of covering an outer peripheral surface of the treatment target material in a circumferential direction with a covering body made of a radiation conversion material which radiates transferred heat as radiant heat;
- and
- a heat treatment process of performing heat treatment by heating or cooling the treatment target material covered with the covering body from the periphery,
- wherein:
- the treatment target material is an impeller having an axial hole into which a rotary shaft is capable of being inserted;
- the heat treatment method further comprises a first insertion process of inserting an axial hole insertion body made of the radiation conversion material into the axial hole;
- and
- the heat treatment process is performed in a state in which the axial hole insertion body is inserted into the axial hole,
- wherein:
- the treatment target material is an impeller having a passage therein;
- the heat treatment method further comprises a second insertion process of inserting a passage insertion body made of the radiation conversion material into the passage;
- and
- the heat treatment process is performed in a state in which the passage insertion body is inserted into the passage.
Dependencies are inferred from the claim text.