DE102020107925A1 - Device for the generative production of components, in particular by means of selective melting or sintering - Google Patents

Abstract

The invention relates to a device for the generative production of components, in particular for selective melting or sintering, with a light source for generating a light beam, a processing head that is either coupled to the light source with a beam guide so that the light beam is guided to the processing head, or the light source is arranged directly on the processing head so that a light beam can be directed from the processing head to a processing area, the processing head being movably mounted so that the light beam can be directed to any point in the processing area. The invention is characterized in that a plurality of processing heads are provided for the respective guidance of a light beam on the processing area, and the processing heads are each arranged on a slide which can be moved along a crossbeam. This allows powder to be melted or sintered at several points at the same time. The machining heads are preferably arranged on swivel arms. This allows a very simple and inexpensive design of the device.

Description

The present invention relates to a device for the additive manufacturing of components, in particular by means of selective melting or sintering.

From the DE 10 2016 222 068 A1 a device and a method for generative component production with several spatially separated steel guides emerges. A machining head has several optical switching elements via which several beams can be directed onto the target position. The machining head is aligned displaceably on a linear axis. The linear axis is in turn mounted displaceably on a linear axis that is perpendicular to it. This enables an XY movement. The laser beam source or sources are attached to the linear axis.

the WO 2018/202643 A1 discloses an apparatus for additive manufacturing by selective laser sintering. One or more lasers are assigned to one or more laser heads. These lasers are distributed to the individual heads via the beam splitter. The heads can be moved over rails in the X and Y directions. The heads can be moved independently of each other. The light is fed to the heads using mirrors.

From the US 10,399,183 B2 an additive manufacturing process emerges in which an optical head is supplied with a laser beam via a glass fiber. As a result, several laser beams can be directed to the same head and executed in parallel from there. This enables parallel melting points on the surface of the powder bed.

A similar procedure is in the US 10,399,145 B2 described.

In the US 2015/0283612 A1 , the US 2014/0198365 A1 and the JP2009-65 09A Selective laser sintering devices are disclosed which have multiple optical heads capable of directing laser beams onto a powder bed. These heads themselves cannot be moved in the X and Y directions, but direct the laser beam into the corresponding positions via mirrors. The advantage here is that the location of the laser focal point can be changed quickly. In this case, however, the heads have to be comparatively far away from the powder bed and can only illuminate a limited area.

the DE 10 053 742 C5 , the US 9,011,136 B1 and the CN 206065685 U show devices for sintering with a compound slide arrangement, an additive manufacturing process with multiple heads for plastic printing and a device with a head that has both a 3D printing and a 3D cutting element.

The invention is based on the object of creating a device for the generative production of components, in particular for selective melting or sintering, which is simple in design, allows a high production speed and with which 3D components can be produced with high precision.

The object is achieved by a device with the features of claim 1. Advantageous refinements are given in the subclaims.

A device according to the invention for the generative production of components, in particular for selective melting or sintering, comprises a light source for generating a light beam, a processing head that is either coupled to the light source with a beam guide so that the light beam is guided to the processing head, or the light source is arranged directly on the processing head so that a light beam can be directed from the processing head to a processing area, the processing head being movably mounted so that the light beam can be directed to different locations in the processing area.

The device is characterized in that a plurality of processing heads are provided for each directing a light beam onto the processing area, and the processing heads are each arranged on a slide which can be moved along a crossbeam.

By providing several processing heads, several light beams can be directed onto the processing area at the same time, so that several points in the processing area can be melted or sintered in parallel. The machining heads are arranged on or on a slide and can be moved along a cross member. This allows simple and reliable positioning of the machining heads over the machining area.

The machining heads are preferably each arranged on one of the carriages by means of a pivotable swivel arm. By providing such swivel arms for the machining heads, the machining heads can be quickly positioned at any point over a large section of the machining area. This section extends around the traverse along which the respective slide with the respective machining head can be moved in an area around the Swivel axis of the swivel arm, which extends on both sides by a width which corresponds to the length of the swivel arm. This section is thus strip-shaped around the crossbeams with a width which corresponds approximately to twice the length of the pivot arms. This strip-shaped section is referred to in the following as the cover area, since the machining heads, which are arranged on the slides of a traverse, can be arranged at any position within the cover area and thus impinge or cover the machining area with a light beam at any point in the cover area can.

It can be useful to position the machining heads only in a restricted angular range of the swivel arms, because the more the swivel arms swivel the machining head away from the traverse, the less precise the position of the machining head in the direction parallel to the traverse becomes. The angular range can be limited, for example, to a maximum swivel angle with respect to the cross member of a maximum of 60 ° or a maximum of 45 °. With a maximum swivel angle of 45 °, the width of the cover area is reduced to the length of the swivel arm.

The device can have a plurality of cross members which are arranged parallel to one another. The crossbars are preferably spaced apart such that the cover areas overlap from adjacent crossbars.

The beam guidance for the respective light beam can be formed along the swivel arms by means of reflector elements. This enables very light swivel arms, which have a low rotational moment of inertia, so that they can be swiveled quickly to any rotational position.

The pivot arms are preferably made of plastic, in particular made of fiber-reinforced plastic. At each end remote from the pivot axis of the pivot arm, a mirror can be provided for directing the respective light beam onto the processing area.

The beam guides can be designed at least partially as light guides. The light guide can extend from the light source to the respective processing head. The respective light guide can, however, also only be guided from the light source to the pivotably mounted end of the respective pivot arm and there be arranged with its end in such a way that the light beam is coupled into a beam guide along the pivot arm, which is formed by means of reflector elements. Such an embodiment has the advantage that the swivel arm can be rotated through 360 ° or more without the light guide having to be rotated. The end of the light guide at which the light from the light guide is coupled into the beam guide on the swivel arm can be arranged in a stationary manner with respect to the slide to which the swivel arm is attached.

The traverses on which the carriages are movably mounted can be arranged in a stationary manner. This is particularly advantageous in connection with an embodiment with processing heads arranged on swivel arms, since such a fixed arrangement can be controlled much more easily to avoid collisions between different swivel arms than in a device in which the swivel arms can be swiveled, the carriages can be moved along the traverses and the Traverses themselves can be moved transversely to their longitudinal direction. In addition, with a fixed arrangement of the traverses and swivel arms on the slide with a few traverses, complete coverage of the processing area can be achieved, provided the swivel arms are not too short. Since the processing heads arranged at the free ends of the swivel arms can be very light, for example only by means of a small mirror, even with longer swivel arms with a length of, for example, at least 10 cm, preferably at least 15 cm, and in particular at least 20 cm, a little Rotational moment of inertia can be achieved.

The device can be designed so that one or more cross members can be retrofitted. In this way, on the one hand, the processing area can be subsequently enlarged and, on the other hand, the density of cross members and thus of processing heads in a predetermined processing area can be increased. With an increase in the density of the crossbars and thus a reduction in the distance between the crossbars, it may be useful to attach the swivel arms to the carriage so that they can be replaced so that shorter swivel arms can be used with a shorter distance between the crossbars.

At least two carriages which can be moved independently of one another are preferably mounted on each cross member, each carriage having a machining head. It is also possible for more than two carriages, for example three or four carriages, to be provided per traverse.

A plurality of light sources are preferably provided, each of which is assigned to one or more processing heads. The light sources are preferably lasers, in particular CO2 lasers or ND: YAG lasers. CO2 lasers are mainly used for melting or sintering plastic powder ND: YAG laser used for melting or sintering metal powder. Such a COz laser has, for example, a light output of 30 W to 70 W and an ND: YAG laser of 100 W to 1,000 W and more. The light sources can also be light-emitting diodes, in particular super-luminescence light-emitting diodes, and / or semiconductor lasers.

By providing several light sources and several processing heads, which can be positioned independently of one another in the processing area, it is possible for powder to be melted or sintered simultaneously at several points in the processing area in order to produce a 3D component. This simultaneous melting or sintering of the powder increases the production speed of additive manufacturing with the present device compared to conventional devices. Even if the processing heads remain a little longer at the individual points, a high production speed can be achieved. This makes it possible for light sources with a comparatively low light output to be used. This significantly lowers the cost of the device.

A multiplexer can be provided to distribute the light beam from one of the light sources to different beam guides. Such a multiplexer is useful for very bright light sources with which the powder can be melted or sintered with short pulses. In the processing area, the device preferably has a powder bed in which there can be powder that is selectively melted by means of the light beam.

The powder can be a metal powder or a plastic powder.

The individual swivel arms can be arranged at different heights in order to avoid collisions when moving the swivel arms.

The individual light sources can be designed in such a way that they emit light beams with different frequencies or different frequency ranges and / or different intensities. This allows the selective melting or sintering process to be controlled individually. This allows, for example, a control of the porosity of the product manufactured with it.

The bundles of light rays can also be focused on the processing area to different degrees. The focusing can be set, for example, by means of an objective and / or a height adjustment of the processing heads.

With the device according to the invention, powder can be melted or sintered simultaneously at several points in a powder bed.

• 1 eine Prozesskammer einer Vorrichtung zum generativen Fertigen von Bauteilen in einer seitlichen Schnittansicht,
• 2 einen Vorratszylinder und ein Pulverbett in der Draufsicht mit mehreren Bearbeitungsköpfen, welche über dem Pulverbett frei anordbar sind, in einer Draufsicht,
• 3a einen Schwenkarm zur Positionierung eines Bearbeitungskopfes, wobei eine Strahlführung aus einem Lichtleiter ausgebildet ist, der sich von einer Lichtquelle zum Bearbeitungskopf erstreckt,
• 3b einen weiteren Schwenkarm, der an seinem freien Ende eine Lichtquelle aufweist in der Seitenansicht,
• 3c einen weiteren Schwenkarm, bei dem eine Strahlführung als Lichtleiter ausgebildet ist, welche sich von der Lichtquelle bis zu dem Schwenkgelenk des Schwenkarms erstreckt, wobei entlang dem Schwenkarm eine mittels Reflektorelemente ausgebildete Strahlführung vorgesehen ist, in einer schematischen, seitlichen Schnittansicht.
• 3d einen weiteren Schwenkarm mit einem gepumpten Laser, wobei Lichtpumpe und Resonator räumlich getrennt angeordnet sind in einer Seitenansicht.

The invention is explained in more detail below by way of example with reference to the drawings. The drawings show schematically in:

• 1 a process chamber of a device for the additive manufacturing of components in a lateral sectional view,
• 2 a storage cylinder and a powder bed in a plan view with several processing heads, which can be freely arranged above the powder bed, in a plan view,
• 3a a swivel arm for positioning a processing head, wherein a beam guide is formed from a light guide which extends from a light source to the processing head,
• 3b another swivel arm, which has a light source at its free end in the side view,
• 3c a further swivel arm in which a beam guide is designed as a light guide, which extends from the light source to the swivel joint of the swivel arm, with a beam guide formed by means of reflector elements being provided along the swivel arm, in a schematic, side sectional view.
• 3d a further swivel arm with a pumped laser, the light pump and resonator being arranged spatially separated in a side view.

The following is an exemplary embodiment of a device for the generative production of components, which in the present case is referred to as a "3D printer" for short. 1 is referred to, explained. Such a 3D printer has a process chamber that is closed on all sides 2 on, in which there is a powder bed 3 and a storage cylinder 4th is located ( 1 , 2 ). In the storage cylinder 4th is a storage flask 5 arranged, which by means of a first reciprocating piston / cylinder unit 6th can be raised or lowered vertically.

The powder bed 3 is formed equally from a cylindrical body and approximately rectangular in plan view, in which a production piston 7th is mounted vertically displaceably, which by means of a second reciprocating piston / cylinder unit 8th is actuatable. The powder bed forms a processing area in which a 3D component 31 can be produced.

The storage cylinder 4th and the powder bed 3 are located in the process chamber 2 . That Powder bed 3 is adjacent to the storage cylinder 4th arranged. It's a squeegee 9 provided which in the direction of movement 10 ( 1 ) can be moved in such a way that from the storage cylinder 4th a powder held in it 11 into the powder bed 3 can be deleted. With the squeegee 9 thus becomes a superficial powder layer of the storage cylinder 4th onto the surface in the powder bed 3 transfer. By gradually lifting the supply piston 5 and gradually lowering the production piston 7th can be the surface of the powder 11 in the powder bed 3 and in the storage cylinder 4th be kept at roughly the same level.

In the area above the powder bed 3 is a movement device 12th for moving a large number of processing heads 13th intended.

The movement device 12th includes several trusses 14th which extends across the powder bed 3 extend. The trusses 14th are arranged parallel to each other. In the present embodiment, there are three trusses 14th intended ( 1 , 2 ). The middle traverse 14th is slightly higher than the two outer trusses 14th arranged.

The trusses 14th have an approximately rectangular cross-section, each with one on the vertical longitudinal side surfaces 15th protruding rail profile 16 extending the entire length of the truss 14th extend ( 3a-3 ). On the rail profiles 16 of each traverse 14th are two slides in the longitudinal direction of the traverses 14th movably mounted. The sleigh 17th can automatically by means of a drive device along the respective traverse 14th be moved. The drive device can comprise a drive belt driven by an external motor which is attached to the respective carriage 17th is coupled. However, it can also be done in the sled 17th even a drive mechanism such as a drive wheel driven by a motor may be provided. In principle, it is also possible to drive the slide by means of a linear motor, in which case the slide 17th and on the traverse 14th the corresponding drive means and counter drive means are to be provided.

On the sledge 17th is a swivel arm 18th by means of a swivel joint 19th arranged. The swivel arm 18th is with the swivel joint 19th about a vertical pivot axis 20th rotatably mounted. On the sledge 17th is a stepper motor (not shown) for rotating the swing arm 18th around the pivot axis 20th intended. On from the pivot axis 20th far end of the swing arm 18th is the machining head 13th provided that the in 3a embodiment shown through one end 22nd a light guide 21 and one at the end 22nd of the light guide 21 arranged optical lens 23 is trained. The processing head 13th is arranged in such a way that a light beam guided in the light guide 24 is dispensed vertically downwards.

The light guide is formed from a flexible optical fiber. The optical fiber can be, for example, a glass fiber or an optical polymer fiber.

The stepper motor and the swivel joint 19th are arranged very close to the pivot axis. As a result, the essential mass is the one with the swivel arm 18th rotatable parts around the pivot axis 20th concentrated. The swivel arm 18th itself is comparatively light, so that the moment of inertia of rotation is low and the swivel arm 18th quickly and precisely around the swivel axis 20th can be rotated.

The light guide 21 leads to a light source 25th which is a bit away from the swivel arm 18th is arranged. The light source 25th is preferably a laser, in particular a CO ₂ laser or an ND: YAG laser. The light source 25th can also be a semiconductor laser or a light-emitting diode, in particular a super-luminescence light-emitting diode.

An array of light sources can also be provided which has a light source for each processing head.

In the following, further embodiments of the swivel arm are explained, which are exactly the same as those above with reference to FIG 3a Embodiment described are formed, unless otherwise specified.

In an alternative embodiment of the swivel arm 18th ( 3b) is the light source 25th along with the optical lens 23 directly on from the pivot axis 20th far end of the swing arm 18th arranged so that a light beam 24 can be sent vertically downwards. Incidentally, the swivel arm is 18th designed in the same way as in the above-explained embodiment according to FIG 3a .

According to a further embodiment ( 3c ) is a beam guide from the light source 25th to the sled 17th by means of a light guide 26th and along the swivel arm 18th by means of reflector elements 27 , 28 educated. In the present embodiment, the reflector elements 27 , 28 each designed as a mirror. However, they can also be represented by other optical elements that deflect a light beam, such as prisms or the like, for example. The swivel arm 18th is designed as a hollow plastic tube, which can in particular consist of a fiber-reinforced plastic. Such a plastic pipe is very light and stiff.

The swivel joint 19th has a vertically extending through opening or through hole 29 on. Adjacent above the through hole 29 is that from the light source 25th distant end of the light guide 26th together with a coupling lens 30th arranged so that the from the light source 25th generated light beam via the light guide 26th transferred and from there into the through hole 29 of the swivel joint 19th is coupled. Below the through hole 29 is a first reflector element 27 arranged that the light beam 24 deflects in such a way that the light beam 24 towards the free end of the swivel arm 18th is steered. On the free, from the swivel axis 20th far end of the swing arm 18th is the second reflector element 28 arranged that the light beam 24 deflects vertically downwards. Optionally, in the beam path between the end of the light guide 26th , which is adjacent to the swivel joint 19th is arranged, and the second reflector element 28 an optical lens 30th be provided for bundling the light beam. Instead of the optical lens 30th An objective can also be provided with which the degree of focusing of the light beam can be changed.

When moving the machining head 13th by means of the swivel arm 18th becomes the light guide 26th only along the traverse 14th with his in the sled 17th arranged end moves. The swivel arm 18th can perform a rotary movement that does not affect the position of the light guide 26th Has. This makes it possible for the swivel arm 18th can perform one or more complete revolutions without affecting the functionality of the light guide 26th is adversely affected because they are affected by such a rotary movement of the swivel arm 18th is not taken.

With such an arrangement, a large number of machining heads can be produced 13th each by means of a swivel arm on one along the traverses 14th movable slide 17th provide, ensuring that the individual light guides 26th cannot get tangled up with each other. This makes it easy to use a 3D printer 1 create, which has at least eight, preferably at least twelve and in particular at least sixteen processing heads, all of which simultaneously or quasi simultaneously with a light beam 24 can be applied.

The light sources 25th can generate the light beam in continuous operation (cw) or in pulsed operation (pw). In the case of a pulsed light source with a high light intensity, it can also be expedient to have a light source with several processing heads 13th to be assigned, wherein a multiplexer is then arranged between the light source and the respective processing heads, so that with the multiplexer the light beam generated by the light source is clearly one of the plurality of processing heads 13th is forwarded. The change between the individual processing heads can take place so quickly that the change is so quick compared to the melting or sintering process that the individual processing heads coupled to them can be viewed as being acted upon by a bundle of light rays at the same time.

Another embodiment of the swivel arm ( 3d ) has a pumped laser with a light pump as the light source 32 and a resonator 33 on which via a light guide 34 are connected to each other. The resonator comprises an active medium, which preferably consists of a solid body, and which is effected by means of the light pump 32 delivered pump light 35 is excited or pumped.

The resonator 33 is together with the optical lens 23 directly on from the pivot axis 20th far end of the swing arm 18th arranged so that a light beam 24 can be sent vertically downwards. The light pump 32 is on the sled 17th arranged in such a way that it does not take part in the pivoting movement of the pivot arm. The light pump 32 usually comprises one or more semiconductor lasers and a heat sink with cooling fins. The light pump is much heavier than the resonator 33 and the optical lens 23 . Since only the resonator 33 and the optical lens 23 and not the light pump 32 is the moment of inertia of rotation of the swing arm 18th small amount.

In this embodiment the light pump is 32 on the sled 17th arranged. The light pump 32 however, it can also be independent of or removed from the slide 17th be arranged.

This embodiment can also be modified so that instead of the light guide 34 a beam guide with reflector elements is provided, as shown in 3c is shown. Then the light guide can 34 either completely omitted or only up to the slide 17th be guided when the light pump is removed from the slide 17th is arranged.

An ND: YAG laser is preferably used as the pumped laser and one or more laser diodes with a wavelength of 808 nm are used as the light pump. However, another laser, such as a Yb: YAG laser, can also be provided.

In the present embodiment, the traverses 14th and thus also the swivel arms attached to it 18th arranged on different levels ( 1 : middle crossbeam higher than the side crossbeams) so that the swivel arms 18th , the one on the middle traverse 14th are arranged, not with the swivel arms 18th can collide, which on the outer trusses 14th are arranged. The level of the swivel arms 18th can also be designed differently if all cross members are arranged at the same height. This can be achieved, for example, in that the swivel joints 19th on the individual slide 17th are attached at different heights.

In the exemplary embodiment explained above, the traverses are 14th fixed in place. In the context of the invention, however, it is possible that the traverses can be moved horizontally and transversely to their longitudinal direction. Such a configuration of the movement device 12th however, requires a more complex control that the individual swivel arms 18th don't collide. Therefore, the arrangement is basically with fixed cross-members 14th preferred. Such a configuration of the movement device 12th allows the 3D printer to be easily scaled, for example by attaching additional slides to the existing crossbars or by attaching one or more additional crossbars to increase production speed.

In the embodiment explained above, the pivot arms are 18th not adjustable in vertical direction. In the context of the invention, however, it is possible either on the slide 17th a device for adjusting the vertical position of the swivel arm 18th to provide or the trusses 14th and / or the entire movement device 12th to train adjustable in the vertical position. This can be particularly useful when wiping the powder bed 3 by means of the squeegee 9 enough space for the squeegee to move between the powder bed 3 and the swivel arms 18th to create and after the squeegee 9 again outside the area of the powder bed 3 is located, the swivel arms 18th be lowered to with the processing heads 13th as close as possible to the surface of the powder bed 3 located powder.

The light sources 25th for the individual processing heads 13th can be designed identically and each generate a light beam with the same intensity and the same frequency or the same frequency range. In the context of the invention, however, it is also possible to provide different light sources for the different machining heads, with which light with different frequencies or frequency ranges is emitted and / or with different intensities. Light sources can also be provided with which the wavelength of the light can be tuned over a certain range. Such lasers, which can be tuned in frequency, are known and generally have a semiconductor amplifier.

An advantage of the present invention is that at the same time by the multiple processing heads 13th different places in the powder bed 3 located powder 11 can be exposed to light and thus heat and can be melted or sintered at the same time. As a result, the production process is parallelized and significantly accelerated compared to conventional 3D printers. A 3D component 31 ( 1 ) be generated.

The processing heads 13th can be very precise over the powder bed 3 can be positioned, which means that high-precision 3D components can be manufactured.

The movement device 12th for the processing heads 13th is very simple and can be produced much more cost-effectively compared to 3D printers with similar performance.

List of reference symbols

1

3D printer

2

Process chamber

3

Powder bed

4th

Storage cylinder

5

Storage flask

6th

Reciprocating piston / cylinder unit

7th

Production piston

8th

Reciprocating piston / cylinder unit

9

Squeegee

10

Direction of movement

11

powder

12th

Movement device

13th

Machining head

14th

traverse

15th

Long side surface

16

Rail profile

17th

sleds

18th

Swivel arm

19th

Swivel joint

20th

Swivel axis

21

Light guide

22nd

end

23

Optical lens

24

Light beam

25th

Light source

26th

Light guide

27

Reflector element

28

Reflector element

29

Through opening

30th

Optical lens

31

3D component

32

Light pump

33

Resonator

34

Light guide

35

Pump light

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102016222068 A1 [0002]
• WO 2018/202643 A1 [0003]
• US 10399183 B2 [0004]
• US 10399145 B2 [0005]
• US 2015/0283612 A1 [0006]
• US 2014/0198365 A1 [0006]
• JP 2009006509 A [0006]
• DE 10053742 C5 [0007]
• US 9011136 B1 [0007]
• CN 206065685 U [0007]

Claims (13)

Device for the generative production of components, in particular by means of selective melting or sintering, with a light source (25) for generating a light beam (24), a processing head (13) which is either coupled to the light source (25) with a beam guide, so that the light beam (24) is guided to the processing head (13), or the light source (25) is arranged directly on the processing head (13) so that a light beam (24) can be directed from the processing head (13) onto a processing area, the processing head (13) is movably mounted so that the light beam (24) can be directed to different locations in the processing area, characterized in that several processing heads are provided for each directing a light beam onto the processing area, and the processing heads are each arranged on a slide, which can be moved along a traverse. Device according to Claim 1 , characterized in that the machining heads (13) are each arranged on one of the carriages (17) by means of a pivotable swivel arm (18). Device according to Claim 2 , characterized in that at least along the pivot arms (18) the beam guidance for the respective light beam (24) is formed by means of reflector elements (27, 28). Device according to Claim 2 or 3 , characterized in that the pivot arms (18) are made of plastic, in particular fiber-reinforced plastic and / or a reflector element (28) is provided at each end remote from a pivot axis (20) for directing the respective light beam (24) onto the processing area . Device according to one of the Claims 2 until 4th , characterized in that one of the light sources (25) or one resonator (33) of a laser serving as a light source (25) are arranged at the free ends of the pivot arms (18) remote from an axis of rotation (20). Device according to one of the Claims 1 until 5 , characterized in that several beam guides are provided and at least partially designed as light guides (21, 26). Device according to one of the Claims 1 until 5 , characterized in that a plurality of cross members (14) arranged parallel to one another and in one plane are provided. Device according to Claim 7 , characterized in that the traverses (14) are arranged in a stationary manner. Device according to one of the Claims 1 until 8th , characterized in that at least two independently movable carriages (17) are mounted on each traverse (14), each carriage (17) having a processing head (13). Device according to one of the Claims 1 until 9 , characterized in that several light sources (25), in particular an array of light emitting diodes and / or semiconductor lasers, are provided, each light source (25) being assigned to one or more processing heads (13). Device according to one of the Claims 1 until 10 , characterized in that a multiplexer is provided for distributing the light beam from one of the light sources (25) to different beam guides which each lead to one of the processing heads (13). Device according to one of the Claims 1 until 11 , characterized in that a control device is provided which is designed in such a way that a plurality of machining heads (13) can be moved simultaneously and / or a light beam (24) can be acted upon at the same time. Device according to one of the Claims 1 until 12th , characterized in that a powder bed (3) is provided which forms the processing area.

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