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US 10,781,701 B2Granted
Impeller for rotary machine, compressor, forced induction device, and method for manufacturing impeller for rotary machine
AssigneeMitsubishi Heavy Industries Engine & Turbocharger, Ltd.
InventorTakashi Arai
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Abstract
The impeller comprises: an impeller body (21) which includes a surface part (27) formed to a fixed depth (D) from a surface (21a) thereof, and which is made of Al or an Al alloy; and an Ni—P-based electroless-plated film (23) covering the surface (21a) of the impeller body (21), wherein the surface part (27) has a first compressive residual stress (P1).
Claims19
An impeller for a rotary machine comprising:
- an impeller body that includes a surface portion provided so as to have a fixed depth from a surface thereof and is made of Al or Al alloy;
- and
- a Ni—P-based electroless-plated film that covers the surface of the impeller body,
- wherein the surface portion has a first compressive residual stress,
- an absolute value of the first compressive residual stress is 300 MPa or more,
- the depth of the surface portion from the surface of the impeller body is equal to or larger than 0.2 mm and less than 0.4 mm,
- the impeller body includes a blade inlet-root portion and a blade outlet-root portion, and
- each of the blade inlet-root portion and the blade outlet-root portion includes the surface portion.
5 more elements
A method of manufacturing an impeller for a rotary machine, the method comprising:
- a surface portion-forming step of forming a surface portion, which is provided so as to have a fixed depth from a surface of an impeller body made of Al or Al alloy and have a first compressive residual stress, by performing surface treatment on the surface of the impeller body;
- and
- a plated film-forming step of forming a Ni—P-based electroless-plated film, which covers the surface of the impeller body, by an electroless plating method after the surface portion-forming step,
- wherein in the surface portion-forming step, glass beads are used as projection materials and the projection materials are projected with jet pressure in the range of 0.1 to 0.45 MPa to from the surface portion on a blade inlet-root portion and a blade outlet-root portion of the impeller body.
1 more element
Dependencies are inferred from the claim text.