阅读说明：本技术 具有束流收集器的增材制造方法和设备 (Additive manufacturing method and apparatus with beam dump ) 是由 U·永布拉德 于 2020-01-29 设计创作，主要内容包括：本发明涉及一种用于通过熔融连续的粉末层来制造三维物体的设备和一种用于电子束流系统用于通过熔融连续的粉末层来制造三维物体的方法,所述系统具有：至少一个用于重新成形所述电子束流的透镜；电子源；和粉末床,所述方法包括步骤：阻挡所述电子束流的选定横截面以控制电子束流功率。通过电子束流与束流阻挡部件之间的干扰,防止电子束流的一部分到达粉末床。(The invention relates to a device for producing a three-dimensional object by fusing successive powder layers and to a method for an electron beam current system for producing a three-dimensional object by fusing successive powder layers, said system having: at least one lens for reshaping said beam current; an electron source; and a powder bed, the method comprising the steps of: blocking a selected cross section of the electron beam current to control electron beam current power. By interference between the electron beam and the beam blocking member, a part of the electron beam is prevented from reaching the powder bed.)

1. A method for an electron beam system for manufacturing a three-dimensional object (109) by fusing successive powder layers, the system having: at least one lens (103, 104, 105, 106) for reshaping the electron beam current (108); an electron source (107); and a powder bed (110), the method comprising the steps of: blocking a selected cross section of the electron beam current (108) to control electron beam current power.

2. The method according to claim 1, characterized in that the electron source (107) is a diode electron source.

3. The method according to any of the preceding claims, wherein the electron source (107) is a laser heated electron source.

4. The method according to any of the preceding claims, wherein the electron beam current (108) is variably blocked by interference by a beam blocking member (101).

5. The method according to any of the preceding claims, wherein the beam current blocking member (101) is provided with an aperture (102, 202) for at least partially passing the electron beam current (108).

6. The method according to any of the preceding claims, wherein the hole (202) is formed in a conical shape.

7. The method according to any of the preceding claims, wherein the beam current blocking component (101) is arranged for at least partially receiving energy by being disturbed by the electron beam current (108).

8. The method according to any of the preceding claims, wherein the beam current blocking means (101) is located between the electron source (107) and the powder bed (110).

9. The method according to any of the preceding claims, wherein the beam current blocking member (101) is positioned between the lens for reshaping the electron beam current (108) and the powder bed (110).

10. Method according to any of the preceding claims, characterized in that the electron beam current (108) is formed with a crossover at the beam stop (101) by means of the lens for reshaping the electron beam current (108).

11. The method according to any of the preceding claims, wherein the reshaping of the electron beam current (108) is defocusing.

12. The method according to any of the preceding claims, wherein the reshaping of the beam current (108) is a translation.

13. The method according to any of the preceding claims, wherein the reshaping of the beam current (108) is an aberration.

14. An apparatus for manufacturing a three-dimensional object (109) by fusing successive powder layers, the apparatus comprising: at least one lens for reshaping the electron beam current (108); an electron source (107); a powder bed (110); a beam blocking component (101) for receiving energy from the electron beam source (107) to variably control electron beam power to the powder bed (110).

15. An apparatus according to claim 14, characterized in that the electron source (107) is a diode electron source.

16. The apparatus according to any of the claims 14 to 15, characterized in that the electron source (107) is a laser heated electron source.

17. An apparatus according to any one of claims 14 to 16, characterized in that the electron beam current (108) is variably blocked by interference by a current blocking member (101).

18. An apparatus according to any one of claims 14-17, characterized in that the beam current blocking member (101) is provided with an aperture (102, 202) for at least partially passing the electron beam current (108).

19. The apparatus according to any one of claims 14 to 18, wherein the aperture (102, 202) is formed in a conical shape.

20. An apparatus according to any one of claims 14-19, characterized in that the beam current blocking member (101) is provided for at least partly receiving energy by being disturbed by the electron beam current (108).

21. The apparatus according to any of the claims 14 to 20, characterized in that the beam current blocking means (101) is located between the electron source (107) and the powder bed (110).

22. The apparatus according to any of the claims 14 to 21, wherein the beam current blocking member (101) is positioned between the lens for reshaping the electron beam current (108) and the powder bed (110).

23. An apparatus according to any one of claims 14-22, characterized in that the electron beam current (108) is formed with a crossover at the beam blocking member (101) by means of the lens for reshaping the electron beam current (108).

24. The apparatus according to any of the claims 14 to 23, characterized in that the reshaping of the electron beam current (108) is defocusing.

25. The apparatus according to any of the claims from 14 to 24, characterized in that said reshaping of said beam current (108) is a translation.

26. The apparatus according to any of the claims 14 to 25, characterized in that said reshaping of said electron beam current (108) is an aberration.

Technical Field

The present invention relates to an additive manufacturing apparatus for producing a three-dimensional object from a powdered material by fusing the powdered material layer by layer in a powder bed.

Problems of the prior art

In additive manufacturing apparatuses using electron beams, the electron beam source is often designed as a triode with a gate for steering the beam. However, triode designs have disadvantages and the diode design of the electron source is advantageous from several aspects. But the diode design lacks a gate for rapidly turning on and off the electron beam current. When an electron beam is used to heat and fuse powders, it is desirable to rapidly control the power in the electron beam.

Description of the Related Art

It is known to shape the electron beam current by forcing the current through an aperture on the way from the source of the current to the surface of the target powder. This shaping of the beam current can be designed to remove unwanted aberrations in the periphery of the beam current by having the edges of the aperture interfere with the beam current and preventing the outer periphery of the beam current from passing through the aperture.

Disclosure of Invention

The invention relates to a method for an electron beam system for manufacturing a three-dimensional object by fusing successive powder layers, said system having an electron source, a powder bed and at least one lens for reshaping the electron beam, said method comprising the steps of: blocking a selected cross section of the electron beam current to control electron beam current power.

In an embodiment, the electron source may be a diode electron source.

In an embodiment, the electron source is preferably a laser heated electron source.

In an embodiment, an electron beam current is variably blocked by interference of a beam blocking member.

In an embodiment, the beam current blocking member may be provided with a hole for passing at least partially the electron beam current therethrough.

In an embodiment, the hole may be formed in a conical shape.

In an embodiment, the beam current blocking component is provided for at least partially receiving energy by interfering with the electron beam current.

In an embodiment, the beam current blocking member is located between the electron source and the powder bed.

In an embodiment, the beam stop member is positioned between the lens for reshaping the electron beam current and the powder bed.

In an embodiment, the electron beam current may be formed with a cross (cross) at the current blocking part by means of the lens for reshaping the electron beam current.

In an embodiment, the reshaping of the electron beam current may be defocusing.

In an embodiment, the reshaping of the electron beam current may be a translation.

In an embodiment, the reshaping of the beam current may be an aberration.

The invention also relates to an apparatus for manufacturing a three-dimensional object by fusing successive powder layers, said apparatus comprising: at least one lens for reshaping the electron beam current; an electron source; a powder bed; a beam blocking component for receiving energy from the electron beam source to variably control electron beam power to the powder bed.

In an embodiment, the electron source may be a diode electron source.

In an embodiment, the electron source is preferably a laser heated electron source.

In an embodiment, an electron beam current is variably blocked by interference of a beam blocking member.

In an embodiment, the beam current blocking member may be provided with a hole for passing at least partially the electron beam current.

In an embodiment, the hole may be formed in a conical shape.

In an embodiment, the beam current blocking component is provided for at least partially receiving energy by interfering with the electron beam current.

In an embodiment, the beam current blocking member is located between the electron source and the powder bed.

In an embodiment, the beam stop member is positioned between the lens for reshaping the electron beam current and the powder bed.

In an embodiment, the electron beam current may be formed with a crossover at the beam current blocking member by means of the lens for reshaping the electron beam current.

In an embodiment, the reshaping of the electron beam current may be defocusing.

In an embodiment, the reshaping of the electron beam current may be a translation.

In an embodiment, the reshaping of the beam current may be an aberration.

The scope of the invention is defined by the claims, which are incorporated into this section by reference. A more complete understanding of embodiments of the present invention will be afforded to those skilled in the art, as well as a realization of additional advantages thereof, by a consideration of the following detailed description of one or more embodiments. Reference will be made to the accompanying drawing sheet which will first be described briefly.