Method For Producing A Turbomachine Impeller

• US 20190308285A1
• Filed: 10/26/2017
• Published: 10/10/2019
• Est. Priority Date: 10/27/2016
• Status: Active Grant

• Current Assignee: MAN Energy Solutions SE (Volkswagen AG)
• Original Assignee: MAN Energy Solutions SE (Volkswagen AG)
• Inventors: DOMMERMUTH, Matthias, SCHOB, Sascha
• Granted Patent: US 10,946,487 B2
• Time in Patent Office: Days
• CPC Class Codes: B22F 10/00 Additive manufacturing of workpieces or articles from metallic powder apparatus or devices therefor B22F12/00
• CPC Class Codes: B22F 10/28 Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
• CPC Class Codes: B22F 2003/247 Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
• CPC Class Codes: B22F 2998/10 Processes characterised by the sequence of their steps
• CPC Class Codes: B22F 5/009 of turbine components other than turbine blades of turbine blades B22F5/04
• CPC Class Codes: B22F 7/08 with one or more parts not made from powder B22F7/062 takes precedence
• CPC Class Codes: B23K 2101/001 Turbines
• CPC Class Codes: B23K 26/34 Laser welding for purposes other than joining
• CPC Class Codes: B23K 26/60 Preliminary treatment
• CPC Class Codes: B23P 15/006 turbine wheels
• CPC Class Codes: F04D 29/023 especially adapted for elastic fluid pumps
• CPC Class Codes: F04D 29/2222 Construction and assembly F04D29/2211 takes precedence
• CPC Class Codes: F04D 29/284 for compressors
• CPC Class Codes: F05D 2230/10 by removing material
• CPC Class Codes: F05D 2230/22 by sintering
• CPC Class Codes: F05D 2230/31 Layer deposition
• CPC Class Codes: Y02P 10/25 Process efficiency

Abstract

A method for producing a turbomachine impeller, which has a radially inner hub body, a radially outer shroud body and blades extending between the hub body and the shroud body. The blades, the hub body and the shroud body are designed as an integral, monolithic assembly includes providing a blank; milling the blank to form a basic contour of the hub body, the shroud body, and the blades; performing build-up welding or additive manufacturing at least once on the main contour that is formed and subsequently performing milling at least once on portions that are formed by the build-up welding.

Claims

1-9. -9. (canceled)

10. A method for producing a turbomachine impeller, having a radially inner hub body, a radially outer shroud body, and moving blades extending between the inner hub body and the outer shroud body, wherein the moving blades, the inner hub body and the outer shroud body are embodied as an integral, monolithic assembly, the method comprising:

providing a blank;

milling-machining the blank to forming a basic contour of the inner hub body, the outer shroud body, and the moving blades;

at least one deposition welding or additive manufacturing on the basic contour; and

at least one subsequent milling-machining on portions formed by the at least one deposition welding or additive manufacturing.

11. The method according to claim 10, wherein, alternating multiple times, the deposition welding or the additive manufacturing and the at least one subsequent milling-machining are initially carried out on the portions formed by deposition welding.

12. The method according to claim 11, further comprising:

during an n-th deposition welding or additive manufacturing, material is deposited on the basic contour;

following the n-th deposition welding or additive manufacturing the portions formed in the process undergo an n-th milling-machining;

subsequent to the n-th milling-machining on the portions formed by this milling-machining, material is again deposited on the basic contour during a (n+1)-th deposition welding or additive manufacturing; and

following this (n+1)-th deposition welding or additive manufacturing, the portions (15n+1) formed in the process undergo an (n+1)-th milling-machining, wherein n>

1 applies.

13. The method according to claim 11, wherein the multiply alternating deposition welding or additive manufacturing and subsequent milling-machining in a radial direction of the turbomachine impeller is performed at least one of:

radially inside to radially outside and

radially outside to radially inside.

14. The method according to any one of the claim 10, wherein the milling-machining of the blank, the at least one deposition welding or additive manufacturing, and the at least one subsequent milling-machining are carried out on one machine tool, which comprises both at least one tool for the milling-machining and at least one tool for the deposition welding.

15. The method according to any one of the claim 10, wherein the deposition welding is carried out as laser deposition welding or laser sintering.

16. The method according to any one of the claim 10, wherein during the at least one deposition welding or additive manufacturing a metal alloy material is deposited on the milling-machined blank, that is different that a metal alloy material of the blank.

17. The method according to claim 11, wherein during the multiple deposition welding or additive manufacturing a metal alloy material is deposited on the milling-machined blank, which deviates at least once from a metal alloy material of the blank.

18. The method according to any one of the claim 11, wherein during the multiple deposition welding or additive manufacturing, different metal alloy materials are deposited on the milling-machined blank.

19. The method according to claim 10, wherein the at least one deposition welding or additive manufacturing, is a laser sintering on the basic contour.