Device and method for generative component production

Patent metadata

Field	Value
Publication number	US-9827632-B2
Application number	US-201414647509-A
Country	US
Kind code	B2
Filing date	Jul 9, 2014
Priority date	Jul 11, 2013
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

The present invention relates to a device for laser-based generative component production. The device comprises a processing head ( 1 ), using which a plurality of mutually separate laser beams are directed adjacently and/or overlapping to some extent onto the processing plane, The processing head ( 1 ) is moved across the processing plane using a movement apparatus ( 9 ), while the mutually separate laser beams are modulated independently of one another in terms of intensity, in order to obtain the desired exposure geometry. The laser power and the dimensional size can be scaled cost effectively during the generative production using the suggested device and the associated method.

First claim

The invention claimed is:

1. A device for generative component production, particularly for selective laser melting or laser sintering, comprising
a processing head which uses a plurality of mutually separate laser beams which can be directed overlapping to some extent onto a processing plane,
a laser beam source arrangement which uses the plurality of mutually separate laser beams which can be generated,
an apparatus for providing a material in the processing plane,
a movement apparatus which uses a relative movement between the processing head and the processing plane which can be generated in mutually parallel planes, and
a control apparatus which uses the movement apparatus for generating the relative movement which can be controlled and the mutually separate laser beams of said plurality of mutually separate laser beams which can be modulated independently of one another in terms of intensity,
wherein the processing head has one or a plurality of focussing optical systems, through which all laser beams of said plurality of mutually separate laser beams can be focussed in the direction of the processing plane, and directs the plurality of mutually separate laser beams onto the processing plane in such a manner that a continuous intensity distribution is obtained from the plurality of mutually separate laser beams in the processing plane, and
wherein the control apparatus is constructed in such a manner that it modulates the intensity of the plurality of mutually separate laser beams as a function of a predetermined component geometry in each case.

2. The device according to claim 1 ,
characterised
in that the processing head directs the plurality of mutually separate laser beams onto the processing plane in such a manner that an elongated intensity distribution is obtained from the plurality of mutually separate laser beams in the processing plane.

3. The device according to claim 1 ,
characterised
in that the continuous intensity distribution is a laser line.

4. The device according to claim 1 ,
characterised
in that the control apparatus is constructed in such a manner that it switches the intensity of the plurality of mutually separate laser beams for modulation on and off.

5. The device according to claim 1 ,
characterised
in that the movement apparatus has a translation axis or two mutually perpendicular translation axes, via which the processing head can be moved in a plane parallel to the processing plane.

6. The device according to claim 1 ,
characterised
in that the movement apparatus has a translation axis, via which the processing head can be moved in a direction parallel to the processing plane, wherein the processing head has a scanner apparatus, using which the laser beams can be guided in the direction perpendicular thereto across the processing plane.

7. The device according to claim 1 ,
characterised
in that an installation space with a length and a width is present for component production, the movement apparatus has a translation axis, via which the processing head can be moved in a plane parallel to the processing plane across the length of the installation space, and the processing head extends over the entire width of the installation space.

8. The device according to claim 1 ,
characterised
in that the processing head has one optical fibre connection for each of the plurality of mutually separate laser beams, which connection can then be connected to the laser beam source arrangement via an optical fibre.

9. The device according to claim 1 ,
characterised
in that the apparatus for providing a material in the processing plane is coupled to the processing head, so that the apparatus for providing a material in the processing plane moves simultaneously with the movement component in a movement direction of the processing head.

10. The device according to claim 1 ,
characterised
in that the laser beam source arrangement has a plurality of fibre-coupled diode lasers for creating the plurality of mutually separate laser beams.

11. A method for generative component production using a device in which a powdery material for the component is melted in layers by irradiation with laser radiation in a processing plane whilst forming a melt bath, comprising
providing a device which comprises
a processing head which uses a plurality of mutually separate laser beams which can be directed overlapping to some extent onto a processing plane,
a laser beam source arrangement which uses the plurality of mutually separate laser beams which can be generated,
an apparatus for providing a material in the processing plane,
a movement apparatus which uses a relative movement between the processing head and the processing plane which can be generated in mutually parallel planes, and
a control apparatus which uses the movement apparatus for generating the relative movement which can be controlled and the mutually separate laser beams of said plurality of mutually separate laser beams which can be modulated independently of one another in terms of intensity,
wherein the processing head has one or a plurality of focussing optical systems, through which all laser beams of said plurality of mutually separate laser beams can be focussed in the direction of the processing plane, and directs the plurality of mutually separate laser beams onto the processing plane in such a manner that a continuous intensity distribution is obtained from the plurality of mutually separate laser beams in the processing plane, and
wherein the control apparatus is constructed in such a manner that it modulates the intensity of the plurality of mutually separate laser beams as a function of a predetermined component geometry in each case; and
generating an elongated intensity distribution for the irradiation of the material in the processing plane from laser spots of all the laser beams of said plurality of mutually separate laser beams, which are focussed in the direction of the processing plane, and is moved across the processing plane, and wherein the individual laser beams are modulated in terms of intensity, particularly are switched on and off, during the movement such that the melt bath created in the processing plane is adapted in terms of the dimensions thereof to the geometry of the component region to be created in each case.

12. The method according to claim 11 ,
characterised
in that the elongated intensity distribution is generated over the entire width of an installation space used for the production of the component.

Assignees

• Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E V

Inventors

• Eibl Florian
• Hagedorn Yves-Christian
• Jauer Lucas
• Meiners Wilhelm

Classifications

• B23K26/354

  by melting · CPC title

• B23K26/0608

  in the same heat affected zone [HAZ] (B23K26/0613, B23K26/0619 take precedence) · CPC title

• B23K26/0876 Primary

  in at least two axial directions · CPC title

• B29C64/153

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

• B23K26/342

  Build-up welding · CPC title