Method for additive manufacturing of a gas turbine casing part

Patent metadata

Field	Value
Publication number	US-2016290164-A1
Application number	US-201615081225-A
Country	US
Kind code	A1
Filing date	Mar 25, 2016
Priority date	Mar 30, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

A method for manufacturing a turbine casing part having a bearing chamber system including a shell ( 1 ) and at least one bearing receptacle ( 2 ) and further having a protective heat shield ( 30 ) that at least partially encompasses the shell ( 1 ) radially outwardly, the protective heat shield ( 30 ) being additively manufactured integrally with the bearing chamber system by selectively solidifying layer-by-layer a feedstock material ( 5 ) is provided.

First claim

What is claimed is:

1 . A method for manufacturing a turbine casing part having a bearing chamber system including a shell and at least one bearing receptacle and further having a protective heat shield at least partially encompassing the shell radially outwardly, the method comprising:
additively manufacturing the protective heat shield integrally with the bearing chamber system by selectively solidifying layer-by-layer a feedstock material.

2 . The method as recited claim 1 wherein the protective heat shield is additively manufactured with at least one local region of reduced wall thickness or at least one local region of increased wall thickness.

3 . The method as recited in claim 1 wherein the protective heat shield is additively manufactured with at least one bead.

4 . The method as recited in claim 1 wherein the protective heat shield or the shell is additively manufactured with at least one opening for at least partial removal of unsolidified feedstock material.

5 . The method as recited in claim 4 further comprising at least partially removing the unsolidified feedstock material from the at least one opening.

6 . The method as recited in claim 5 further comprising after the at least partial removal of unsolidified feedstock material, closing the at least one opening.

7 . The method as recited in claim 6 wherein the opening is closed by a material-to-material bond or a friction fit and/or by an interlocking fit.

8 . The method as recited in claim 5 wherein the at least one opening is not closed.

9 . The method as recited in claim 1 wherein the protective heat shield has a maximum wall thickness no greater than 75% of a maximum wall thickness of the bearing chamber system or no greater than 5 mm.

10 . The method as recited in claim 1 wherein the bearing chamber system has a maximum wall thickness that is no greater than 10 mm.

11 . The method as recited in claim 1 wherein the feedstock material in unsolidified form is in liquid or bulk form.

12 . The method as recited in claim 1 wherein the feedstock material is in powder form.

13 . The method as recited in claim 1 wherein the feedstock material is thermally, chemically or optically selectively solidified layer-by-layer.

14 . A turbine casing part manufactured according to the method as recited in claim 1 .

15 . A turbine casing part comprising:
a bearing chamber system including a shell and at least one bearing receptacle and further having a protective heat shield at least partially encompassing the shell radially outwardly, the protective heat shield being additively manufactured integrally with the bearing chamber system by selectively solidifying layer-by-layer a feedstock material.

Assignees

• MTU Aero Engines AG

Inventors

• Liebl Christian
• Scharl Richard
• Buck Alexander
• Kirchner Daniel
• Hess Thomas

Classifications

• F01D25/145

  Thermally insulated casings · CPC title

• F01D25/125 Primary

  of bearings · CPC title

• F01D25/24 Primary

  Casings (modified for heating or cooling F01D25/14); Casing parts, e.g. diaphragms, casing fastenings (casings for rotary machines or engines in general F16M {; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045}) · CPC title

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title

• F05D2240/15

  Heat shield · CPC title