Additive manufacturing method and device

Patent metadata

Field	Value
Publication number	US-11820047-B2
Application number	US-202118011300-A
Country	US
Kind code	B2
Filing date	Jun 28, 2021
Priority date	Jun 26, 2020
Publication date	Nov 21, 2023
Grant date	Nov 21, 2023

Abstract

The invention relates to an additive manufacturing method in which a component (10, 42, 43, 44, 45) is produced in layers using an energy beam (8, 41, 58) which solidifies a starting material (4) and is irradiated by energy beam irradiating means (9, 22, 31, 38, 39, 55, 59, 61) while the starting material (4) is held by a base surface (3, 15, 30, 36, 52) arranged on a base element (2, 16, 29, 35, 51). While the starting material (4) is being irradiated with the energy beam (8, 41, 58), the base element (2, 16, 29, 35, 51) is moved by a rotational component which has a base element rotational axis, wherein the starting material (4) is held on the base surface (3, 15, 30, 36, 52) by a centrifugal acceleration generated by the rotational component. The invention is characterized in that a rotational movement is produced for at least some of the energy beam irradiating means (9, 22, 31, 38, 39, 55, 59, 61). Analogously, at least one energy beam rotational axis (46) is proposed for rotating at least some of the energy beam irradiating means (9, 22, 31, 38, 39, 55, 59, 61) in an additive manufacturing device in which the starting material (4) is held on a base surface (3, 15, 30, 36, 52) by a centrifugal acceleration.

First claim

The invention claimed is:

1. An additive manufacturing method in which a component is manufactured in layers by means of an energy beam, which solidifies a starting material and is irradiated by energy beam irradiation means while the starting material is held by a base surface arranged on a base element,
wherein, while the starting material is being irradiated with the energy beam, the base element is moved by a rotational component which has a base element rotational axis, wherein the starting material is held on the base surface by a centrifugal acceleration generated by the rotational component, wherein for at least one part of the energy beam irradiation means a rotational movement with an energy beam rotational axis coaxial to the base element rotational axis is provided,

wherein the base element rotational movement and the energy beam irradiation means rotational movement are each driven separately and the energy beam irradiation means are moved along a translational axis parallel to the base element rotational axis.

2. The method according to claim 1 , characterized in that, during additive manufacturing, a relative velocity of an impact point of the energy beam on the base surface or the surface of the starting material is varied relative to the base surface or relative to the starting material.

3. The method according to claim 1 , characterized in that the intensity of the energy beam is varied during additive manufacturing.

4. The method according to claim 1 , characterized in that the rotational movement of the energy beam irradiation means or of the at least one part of the energy beam irradiation means and the rotational movement of the base element are carried out at angular velocities deviating from one another.

5. The method according to claim 1 , characterized in that the rotational direction of the rotational movement of the energy beam irradiation means or of the at least one part of the energy beam irradiation means and the rotational direction of the rotational movement of the base element are opposite to one another.

6. The method according to claim 1 , characterized in that the angular velocity of the rotational movement of the energy beam irradiation means or of the at least one part of the energy beam irradiation means is changed during additive manufacturing.

7. The method according to claim 1 , characterized in that the amount of centrifugal acceleration acting on the starting material is at least equal to the amount of gravitational acceleration, preferably at least 1.5 times, further preferably at least twice the amount of gravitational acceleration.

8. The method according to claim 1 , characterized in that the amount of centrifugal acceleration is changed in the course of the manufacturing method.

9. The method according to claim 1 , characterized in that the component is built in layers, wherein the local surface normals of the layers have at least one principal component parallel or antiparallel to the centrifugal acceleration.

10. The method according to claim 1 , characterized in that at least two components are built on the same base element in the same manufacturing method.

11. The method according to claim 1 , characterized in that at least one component closed in the circumferential direction of the base surface is built on the base element.

12. The method according to claim 1 , characterized in that the base element is in the shape of a hollow cylinder, at least in some areas, and the longitudinal center axis of the hollow cylinder shape is used as the base element rotational axis of the rotational component.

13. The method according to claim 1 , characterized in that for the movement of the base element the rotational component is combined with further movement components.

Assignees

• Fraunhofer Ges Forschung

Inventors

• Janssen Henning
• Schmidt Florian
• Brecher Christian
• Zontar Daniel

Classifications

• B29C64/153 Primary

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

• B29C64/241

  for rotary motion · CPC title

• B29C64/273

  pulsed; frequency modulated · CPC title

• B33Y10/00

  Processes of additive manufacturing · CPC title

• B33Y30/00

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