System and process for evaluating and validating additive manufacturing operations

Patent metadata

Field	Value
Publication number	US-10252511-B2
Application number	US-201715441639-A
Country	US
Kind code	B2
Filing date	Feb 24, 2017
Priority date	Apr 12, 2016
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

A method of evaluating and validating additive manufacturing operations includes generating a multidimensional space defined by a plurality of bounds, each of the bounds being defined on a distinct parameter of an additive manufacturing process and each of the bounds being directly related to the occurrence of a balling flaw, each of the parameters being a dimension in a multi-dimensional coordinate system, determining a coordinate position of at least one additive manufacturing operation within the multi-dimensional coordinate system, and categorizing the operation as free of balling flaws when the coordinate position is within the multi-dimensional space.

First claim

The invention claimed is:

1. A method of evaluating and validating additive manufacturing operations comprising:
generating a multidimensional space defined by a plurality of bounds, each of said bounds being defined on a distinct parameter of an additive manufacturing process and each of said bounds being directly related to the occurrence of a balling flaw, each of said parameters being a dimension in a multi-dimensional coordinate system and being defined by at least one corresponding mathematical function, wherein at least one of the at least one corresponding mathematical functions is determined via simulation;
determining a coordinate position of at least one additive manufacturing operation within the multi-dimensional coordinate system; and
categorizing the operation as free of balling flaws when the coordinate position is within the multi-dimensional space.

2. A method of evaluating and validating additive manufacturing operations comprising:
generating a multidimensional space defined by a plurality of bounds, each of said bounds being defined on a distinct parameter of an additive manufacturing process and each of said bounds being directly related to the occurrence of a balling flaw, each of said parameters being a dimension in a multi-dimensional coordinate system and being defined by at least one corresponding mathematical function, wherein at least one of the at least one corresponding mathematical functions is determined via simulation, and wherein at least one of the parameters is partially unbounded;
determining a coordinate position of at least one additive manufacturing operation within the multi-dimensional coordinate system; and
categorizing the operation as free of balling flaws when the coordinate position is within the multi-dimensional space.

3. An additive manufacturing apparatus comprising:
a chamber;
a platform within said chamber; and
a controller, the controlling including a processor and a memory, the memory storing instructions for causing the processor to validate at least one input operation as generating a workpiece free of balling flaws by determining a multi-dimensional coordinate in response to receiving the at least one input operation, and comparing the multi-dimensional coordinate to a stored multi-dimensional space, the stored multi-dimensional space being defined by a plurality of bounds, each of said bounds being defined on a distinct parameter of an additive manufacturing process, each distinct parameter of the additive manufacturing system being defined by at least one corresponding mathematical function, wherein the parameters of the additive manufacturing process include a beam power, a beam velocity, a local part temperature, a powder bed thickness, a powder particle size, and a beam spot size and each of said parameters is directly related to the occurrence of a balling flaw, and wherein at least one of the at least one corresponding mathematical functions is determined via simulation, and wherein at least one of the parameters is partially unbounded.

4. The additive manufacturing apparatus of claim 3 , wherein the chamber further includes a powder bed fusion apparatus.

5. The additive manufacturing apparatus of claim 4 , wherein the powder bed fusion apparatus is a laser powder bed fusion apparatus.

6. The additive manufacturing apparatus of claim 4 , wherein the powder bed fusion apparatus is an electron beam powder bed fusion apparatus.

7. The additive manufacturing apparatus of claim 3 , wherein the memory further stores instructions for rejecting the at least one input operation in response to the determined multi-dimensional coordinate falling outside the multi-dimensional space.

8. The additive manufacturing apparatus of claim 3 , wherein the multi-dimensional space is a space having four or more dimensions, and wherein each of said dimensions includes at least one bound corresponding to an operational parameter of an additive manufacturing process.

9. A method of evaluating and validating additive manufacturing operations comprising:
generating a multidimensional space defined by a plurality of bounds, each of said bounds being defined on a distinct parameter of an additive manufacturing process and each of said parameters being directly related to the occurrence of a balling flaw, each of said parameters being a dimension in a multi-dimensional coordinate system and at least one of said parameters is partially unbounded;
determining a coordinate position of at least one additive manufacturing operation within the multi-dimensional coordinate system; and
categorizing the operation as free of balling flaws when the coordinate position is within the multi-dimensional space.

10. The method of claim 9 , wherein an operation that is free of balling flaws is an additive manufacturing operation where balling flaws in a resultant work piece are below an acceptable threshold.

11. The method of claim 9 , wherein the parameters include a beam power, a beam velocity, a local part temperature, a powder bed thickness, a powder particle size, and a beam spot size.

12. The method of claim 11 , wherein each of said parameters is normalized to each other of said parameters.

13. The method of claim 11 , wherein at least one of the at least one corresponding mathematical functions is a least partially empirically determined.

14. The method of claim 9 , further comprising creating a work piece by causing an additive manufacturing machine to perform the at least one additive manufacturing operation in response to categorizing the at least one additive manufacturing operation as free of balling flaws.

15. The method of claim 9 , wherein at least one of the parameters is fully bounded.

16. The method of claim 9 , wherein the at least one additive manufacturing operation is a sequence of additive manufacturing operations.

17. The method of claim 16 , wherein the sequence of additive manufacturing operations is an ordered list of all operations required to create a part.

18. The method of claim 9 , wherein generating a multidimensional space defined by a plurality of bounds comprises generating multiple multidimensional spaces defined by a plurality of bounds, each of said multiple multidimensional spaces corresponding to one or more flaws and at least one of said multidimensional spaces corresponding to the balling flaw.

Assignees

• United Technologies Corp

Inventors

• Burlatsky Sergei F
• Novikov Dmitri
• Brindley William J
• Furrer David Ulrich

Classifications

• B29C64/124

  using layers of liquid which are selectively solidified · CPC title

• B29C64/20

  Apparatus for additive manufacturing; Details thereof or accessories therefor · CPC title

• B33Y50/02

  for controlling or regulating additive manufacturing processes · CPC title

• B22F2999/00

  Aspects linked to processes or compositions used in powder metallurgy · CPC title

• B29C64/386

  Data acquisition or data processing for additive manufacturing · CPC title