Method for producing a tubular body with reduced internal stress by using 3D printing, and a tubular body with reduced internal stress

Patent metadata

Field	Value
Publication number	US-11491701-B2
Application number	US-201916275010-A
Country	US
Kind code	B2
Filing date	Feb 13, 2019
Priority date	Feb 28, 2018
Publication date	Nov 8, 2022
Grant date	Nov 8, 2022

Abstract

A method for producing a tubular body with reduced internal stress uses 3D printing. The tubular body has an outer wall with a stiffening structure extending along at least part of the outer wall. The method sets a printing plane for 3D printing with a 3D printer, and prints a tubular body layer in the printing plane with the 3D printer. The tubular body layer has an outer wall layer and a stiffening structure layer extending in the printing plane along a periphery of the outer wall layer. The stiffening structure layer has at least two portions spaced apart from one another. The method produces an outer wall with a stiffening structure for a tubular body with reduced internal stress.

First claim

What is claimed is:

1. A method for producing a tubular body with reduced internal stress by using 3D printing, the tubular body having an outer wall with a stiffening structure, the stiffening structure extending along at least part of the outer wall, the method comprising the steps of:
a) setting a printing plane for 3D printing with a 3D printer;
b) printing a tubular body layer in the printing plane with the 3D printer, the tubular body layer having an outer wall layer and a stiffening structure layer, the stiffening structure layer extending in the printing plane along a periphery of the outer wall layer, and the stiffening structure layer having at least two portions spaced apart from one another; and
c) repeating steps a) and b) to produce an outer wall with a stiffening structure for a tubular body with reduced internal stress, wherein a number of stiffening structure layers form the stiffening structure by intersecting on the outer wall of the tubular body to form a hexagonal rib-like network structure with a plurality of hexagons lying on the outer wall of the tubular body.

2. The method according to claim 1 , wherein the outer wall layer and the stiffening structure layer are in one piece.

3. The method according to claim 1 , wherein the stiffening structure extends around the outer wall outside the tubular body.

4. The method according to claim 1 , wherein the stiffening structure forms an irregularly hexagonal rib-like network structure on the outer wall of the tubular body.

5. The method according to claim 1 , wherein step b) comprises the sub step of:
b1) printing the tubular body layer from metal.

6. The method according to claim 5 , wherein the metal comprises titanium.

7. The method according to claim 1 , wherein step b) comprises the sub step of:
b2) printing the tubular body layer from plastic.

8. The method according to claim 1 , wherein step c) comprises the substep of:
c1) repeating steps a) and b) until a first tubular body layer is at a distance from a last tubular body layer of between 50 mm and 1000 mm.

9. The method according to claim 1 , wherein step a) comprises the substep of:
a1) setting a printing plane for 3D printing with a laser 3D printer.

Assignees

• Airbus Defence & Space Gmbh

Inventors

• Napp Christian

Classifications

• B22F10/28

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

• B22F5/009 Primary

  of turbine components other than turbine blades (of turbine blades B22F5/04) · CPC title

• B29C64/10 Primary

  Processes of additive manufacturing · CPC title

• B29C64/153

  using layers of powder being selectively joined, e.g. by selective laser sintering or melting · CPC title

• B22F2005/005

  Article surface comprising protrusions · CPC title