DE102018008736A1 - METHOD AND DEVICE FOR PRODUCING A THREE-DIMENSIONAL OBJECT ON A BUILDING PLATFORM - Google Patents

Abstract

The method relates to a method for producing a three-dimensional object (1) on a building platform (2) by applying layers and selectively solidifying a powdery building material, the method comprising the following steps:
a) making the build platform (2), and then
b) producing the three-dimensional object (1) by layer-wise application and selective solidification of the powdered building material on the building platform (2), a material connection being produced between the building platform (2) and the object (1), and then
c) the object (1) and the construction platform (2) are clamped over at least one clamping section (7a to 7d) in a clamping device (110) of a cleaning device (100), and then
d) at least the object (1) is cleaned from surrounding, unconsolidated powdery building material by the cleaning device (100),
The invention provides that
e) the at least one clamping section (7a to 7d) is formed during the production of the object (1) by layer-wise application and selective solidification of the powdery building material on the building platform (2).

Description

The invention relates to a method for producing a three-dimensional object on a building platform by applying layers and selectively solidifying a powdery building material according to the preamble of claim 1. Furthermore, the invention relates to a device for producing a three-dimensional object on a building platform by applying layers and selectively solidifying one powdery building material according to the preamble of claim 12.

Such a method and such an apparatus are out WO 2015/071184 A1 known. There, in particular, a method and a device is proposed for freeing powder that has not solidified from a three-dimensional object produced on a building platform by layer-wise application and selective solidification of a powdery building material, in which the building platform is attached to a rotating device and then the building platform is rotated by an angle of at least Is turned 90 ° from the upright position. In addition, it is also provided that the object clamped over the construction platform is exposed to vibrations in order to clean loose construction material.

The disadvantage here is that by clamping the unit consisting of the object and the construction platform on the construction platform, a mostly eccentric clamping of this unit with respect to its geometric center or its center of gravity arises and then when the clamped unit is rotated and / or shaken during the cleaning process a relatively large amount of space is required and on the other hand the storage of the tensioning device / rotating device / vibrating device is also subjected to a relatively high load.

Object of the invention

Proceeding from this, the object of the invention is to further develop a method and a device of the type mentioned at the outset in such a way that the disadvantages described above can largely be avoided.

This object is solved by the features of claims 1 and 12.

Disclosure of the invention

1. a) Herstellen der Bauplattform, und dann
2. b) Herstellen des dreidimensionalen Objekts durch schichtweises Aufbringen und selektives Verfestigen des pulverförmigen Aufbaumaterials auf der Bauplattform, wobei zwischen der Bauplattform und dem Objekt eine stoffschlüssige Verbindung erzeugt wird, und dann
3. c) das Objekt und die Bauplattform über wenigstens einen Spannabschnitt in einer Spanneinrichtung einer Reinigungsvorrichtung gespannt werden, und dass dann
4. d) wenigstens das Objekt von umgebendem, unverfestigt gebliebenem pulverförmigen Aufbaumaterial durch die Reinigungsvorrichtung gereinigt wird.

The invention is based on a method for producing a three-dimensional object on a building platform by applying layers and selectively solidifying a powdery building material, the method comprising the following steps:

1. a) making the build platform, and then
2. b) producing the three-dimensional object by layer-by-layer application and selective solidification of the powdered building material on the building platform, a material connection being produced between the building platform and the object, and then
3. c) the object and the construction platform are clamped over at least one clamping section in a clamping device of a cleaning device, and then
4. d) at least the object is cleaned from surrounding, unconsolidated powdery building material by the cleaning device.

The three-dimensional object, such as a component or model, is therefore produced in a layered construction process with the aid of computer data, by repeatedly applying thin layers of loose powdery construction material to the construction platform and selectively solidifying each individual layer into a component or model cross-section. The solidification takes place, for example, chemically, in that droplets of adhesive are selectively applied to defined areas of the layers of loose powdery building material using printing technology. Alternatively, there is the option of selectively fusing or sintering loose powdered building material with high-energy radiation.

By applying the first layer of the powdery building material to the building platform and then selectively solidifying it, a material connection is created between the building platform and the object, in particular an adhesive bond if, using printing technology, droplets of adhesive selectively onto defined areas of the layers of loose powdery building material be applied, or a weld, if loose powder is selectively fused or sintered with high-energy radiation. The building platform and the object are preferably made of the same material.

The cleaning of the object from loose, unconsolidated powdery building material in the cleaning device can include the complete unpacking of the object and the construction platform from the powder cake of loose powder or simply a cleaning of residues of loose powder from the object and the construction platform, which after unpacking still attached to the object and to the construction platform.

• e) der wenigstens eine Spannabschnitt während des Herstellens des Objekts durch schichtweises Aufbringen und selektives Verfestigen des pulverförmigen Aufbaumaterials auf der Bauplattform ausgebildet wird.

According to the method of the invention it is provided that

• e) the at least one clamping section is formed during the production of the object by layer-wise application and selective solidification of the powdery building material on the building platform.

1. a) Einer Prozesskammer, in welcher das schichtweise Aufbringen und selektive Verfestigen des pulverförmigen Aufbaumaterials auf der Bauplattform erfolgt, wobei zwischen der Bauplattform und dem Objekt eine stoffschlüssige Verbindung entsteht,
2. b) einer Steuerung, welche das schichtweise Aufbringen und das selektive Verfestigen des pulverförmigen Aufbaumaterials auf der Bauplattform steuert,
3. c) einer Reinigungsvorrichtung, welche wenigstens das Objekt nach der Herstellung von umgebendem, unverfestigt gebliebenem pulverförmigen Aufbaumaterial reinigt, wobei
4. d) das Objekt und die Bauplattform während des Reinigens in der Reinigungsvorrichtung über wenigstens einen Spannabschnitt in einer Spanneinrichtung der Reinigungsvorrichtung eingespannt sind. Erfindungsgemäß ist bei der Vorrichtung vorgesehen, dass
5. e) die Steuerung derart ausgebildet ist, dass der wenigstens eine Spannabschnitt während des Herstellens des Objekts durch schichtweises Aufbringen und selektives Verfestigen des pulverförmigen Aufbaumaterials auf der Bauplattform ausgebildet wird.

The invention is also based on a device for producing a three-dimensional object on a building platform by applying layers and selectively solidifying a powdered building material, with:

1. a) a process chamber in which the powdery building material is applied in layers and selectively solidified on the building platform, a material connection being formed between the building platform and the object,
2. b) a controller which controls the layer-by-layer application and the selective solidification of the powdery building material on the building platform,
3. c) a cleaning device which cleans at least the object after the production of surrounding, unconsolidated powdery building material, wherein
4. d) the object and the construction platform are clamped during cleaning in the cleaning device via at least one clamping section in a clamping device of the cleaning device. According to the invention, the device provides that
5. e) the controller is designed in such a way that the at least one clamping section is formed on the building platform by layer-by-layer application and selective solidification of the powdery building material during the manufacture of the object.

In other words, the at least one clamping section, on which or via which the unit consisting of the construction platform and the object is then clamped in the clamping device of the cleaning device, is likewise produced during the production of the object or in parallel with the production of the object by layer-wise application and selective solidification of the powdery one Construction material is formed or produced on the construction platform. In particular, loose powdery building material is applied in layers to produce both the at least one clamping section and the object on the building platform and then solidified.

In particular, the at least one clamping section does not constitute a section of the building platform. The arrangement of the at least one clamping section on the object and / or on the building platform is then flexible and can be arbitrary and in particular with regard to the center of gravity or a geometric center of the unit consisting of building platform and object be chosen close or opaque in relation to these designated points. This enables a space-saving and less stressful cleaning and cleaning of the object.

The measures listed in the subclaims allow advantageous developments and improvements of the invention specified in the independent claims.

According to a particularly preferred embodiment, the at least one clamping section serves no other purpose than to be clamped in the clamping device of the cleaning device. In other words, the at least one clamping section represents an additional section on the object or on the building platform with respect to the remaining sections of the object or building platform, which originally relates to the function of the building platform or the function and / or the aesthetics of the object are provided or necessary.

Alternatively, the at least one clamping section could also be multifunctional and be formed by a section of the object as originally intended or necessary for the object in terms of function and / or aesthetics.

According to a further development, the at least one clamping section can be formed separately or spatially separate from the object on the construction platform. For example, the at least one tensioning section can be built up in layers on the construction platform as a block or plate. In particular, the at least one clamping section is generated or arranged on a surface of the building platform facing the object.

According to a development of this measure, the at least one clamping section can then remain on the construction platform, i.e. even after the object has been separated from the building platform, and the building platform is used together with the at least one clamping section as a building platform for producing at least one further three-dimensional object by layer-by-layer application and selective consolidation of powdered building material on this building platform. Then the at least one clamping section only has to be produced once on the construction platform.

In particular, the object can therefore be separated from the construction platform before or after cleaning.

Alternatively, the at least one clamping section can also be formed directly on the object. The at least one clamping section can be separated from the object or left on the object before or after cleaning the object, for example if, as already described above, the at least one clamping section is multifunctional and is formed by a section of the object as it was originally is functionally and / or aesthetically intended or necessary for the object.

The selective solidification of the powdery building material is particularly preferably carried out by means of high-energy radiation, for example by means of electromagnetic radiation or laser radiation. Then a radiation source generating high-energy radiation is provided, the selective solidification of the powdery building material being carried out by means of the high-energy radiation. Alternatively, as described above, an adhesive can also be used for solidification. A metering device is then provided for distributing the adhesive on the respective powder layer.

According to a particularly preferred measure, at least one opening is or is formed in the at least one clamping section for clamping the unit comprising the building platform and the object by means of the clamping device during the manufacture of the at least one clamping section, in relation to which at least one clamping mandrel of the clamping device can be driven by an actuator is actuated or can be actuated into a position retracted into the opening and into a position extended out of the opening, the at least one clamping section being positively clamped on the clamping device in the position of the mandrel retracted into the opening and in the position of the mandrel extended out of the opening is released from the clamping device.

The mandrel and the actuator driving this then form part of the clamping device.

According to a development, at least one first opening cooperating with a first mandrel and at least one second opening cooperating with a second mandrel separate from the first mandrel is or are formed, the openings of the first opening and the second opening pointing away from one another and wherein the first mandrel and the second mandrel are operated in opposite directions to the retracted position and the extended position. Because of the pairs of opening and mandrel / actuator then arranged on opposite sides of the unit consisting of the object and the building platform, this results in a particularly rigid clamping of the unit consisting of the building platform and the building. Of course, such pairs of opening and mandrel / actuator can also be provided on more than two sides of the unit comprising the building platform and the object.

According to a further development, the at least one opening and the at least one mandrel are designed in such a way that they have interlocking, complementarily conical cross sections. In this case, the unit consisting of the construction platform and the object is advantageously centered when a conical mandrel dips into the opening and then the conically shaped radially outer circumferential surface of the mandrel contacts the complementarily conically shaped radially inner circumferential surface of the opening.

The at least one actuator which drives the mandrel can be formed, for example, by a pneumatically, hydraulically or electrically driven actuating cylinder or by an electric servomotor.

According to a particularly preferred measure, the cleaning device can have a pressure medium cleaning device which generates a cleaning pressure medium jet in a pressure medium channel, wherein an opening of the pressure medium channel is directed at least to the object and, with the aid of pressure medium emerging from the mouth, the object of loose and unconsolidated Construction material is cleaned. The pressure medium can in particular be compressed air or a compressed protective gas.

An advantageous double function of the at least one clamping section results if the pressure medium channel of the pressure medium cleaning device is formed in the at least one clamping section. Then the at least one clamping section is used not only for clamping the unit or building platform and object in the clamping device but also for directing the pressure medium for cleaning the object.

According to a development, the cleaning device can also have a pivoting device, by means of which the clamping device can be pivoted about at least one axis. If the unit comprising the construction platform and the object is then clamped in the clamping device via the at least one clamping section, the clamping device can be pivoted by means of the pivoting device so that loose, unconsolidated building material falls off the object due to the action of gravity.

Additionally or alternatively, the cleaning device can have a vibrating device, by means of which the tensioning device in at least vibrates on one level. These vibrations then generate in the loose, unconsolidated particles of the powdered building material for centrifugal forces, which then detach these particles from the object.

Advantageous further developments of the invention result from the patent claims, the description and the drawings. The advantages of features and combinations of several features mentioned in the introduction to the description are only examples and can have an alternative or cumulative effect without the advantages necessarily having to be achieved by embodiments according to the invention. Further features can be found in the drawings, in particular the geometries shown and the relative dimensions of a plurality of components to one another, and their relative arrangement and operative connection. The combination of features of different embodiments of the invention or of features of different claims is also possible, deviating from the selected back relationships of the claims, and is hereby suggested. This also applies to those features which are shown in separate drawings or mentioned in the description. These features can also be combined with features of different claims. Features listed in the claims can also be omitted for further embodiments of the invention.

Figure list

• 1 eine perspektivische Darstellung gemäß einer bevorzugten Ausführungsform einer Reinigungsvorrichtung einer Vorrichtung zum Herstellen eines dreidimensionalen Objekts gemäß der Erfindung;
• 2 eine Seitenansicht der Reinigungsvorrichtung von 1;
• 3 eine Schnittdarstellung der Reinigungsvorrichtung von 1 entlang der Linie A - A von 2;

An exemplary embodiment of the invention is shown in the drawing and explained in more detail in the following description. In the drawing shows

• 1 a perspective view according to a preferred embodiment of a cleaning device of a device for producing a three-dimensional object according to the invention;
• 2nd a side view of the cleaning device of 1 ;
• 3rd a sectional view of the cleaning device of 1 along the line A - A from 2nd ;

Description of the embodiment

1 shows a perspective view according to a preferred embodiment of a cleaning device 100 a device for producing a three-dimensional object 1 , for example a component on a construction platform 2nd by applying layers and selectively solidifying a powdered building material according to the invention.

The apart from the cleaning device 100 The device, not shown here, contains a process chamber of a layered construction device, in which the layered application and selective solidification of the powdered construction material on the construction platform 2nd takes place, then between the build platform 2nd and the object 1 a cohesive connection is created. The device also includes a first electronic control device which enables the layered application and the selective solidification of the powdery building material on the building platform 2nd controls. Furthermore, the device contains the cleaning device created here 100 which at least the object 1 after the production of surrounding, unconsolidated powdery building material. The cleaning should only concern the removal of residual powder, which after unpacking the unit from the object 1 and build platform 2nd still adhering from the powder cake. The cleaning device 100 is controlled in a coordinated manner, for example, by a second electronic control device, not shown here, which contains a CPU, the operation of which is controlled by a computer program.

The construction process and the cleaning process are carried out here, for example, at separate locations and in separate devices, namely in a layer construction device and the cleaning device shown here 100 accomplished.

The object 1 and the build platform 2nd are in the cleaning device during cleaning 100 for example here four block-shaped clamping sections 7a to 7d a tensioning device 110 the cleaning device 100 clamped.

1 shows the object 1 in a form in which it has already been completed by the layered construction of the powdered construction material and now the cleaning of the object 1 of loose, unconsolidated powdery building material in the cleaning device 100 pending. Previously, the construction platform 2nd produced as a separate component and then the three-dimensional object 1 through layer-by-layer application and selective solidification of the powdered building material on the building platform 2nd made in a known manner. In the present case, the powdery building material was selectively solidified by means of high-energy radiation, here in particular by means of laser sintering (laser radiation). It is between the build platform 2nd and the object 1 a cohesive connection has been created.

The first electronic control device which controls components of the device in a coordinated manner and thereby the layer building process and which contains a CPU whose Operation controlled by a computer program, controlled the layer building process such that the four block-shaped clamping sections 7 together with the object 1 through layer-by-layer application and selective solidification of the powdered building material on the building platform 2nd be formed.

In other words, the four block-shaped clamping sections, for example, over which the unit from the building platform was then placed 2nd and object 1 in the clamping device 110 the cleaning device 100 is clamped, also by layer-by-layer application and selective solidification of the powdered building material on the building platform 2nd Formed or created in the same manufacturing process through which the object 1 is shaped or produced.

In particular, here the four block-shaped clamping sections, for example 7 no part or section of the build platform 2nd itself. Rather, these are, for example, four block-shaped clamping sections 7a to 7d on one to the object 1 facing surface of the build platform 2nd generated or arranged, but here, for example, spatially separated or separate from the object 1 . Here, for example, four block-shaped clamping sections 7a to 7d serve, for example, for no other purpose than in the clamping device 110 the cleaning device 100 to be excited.

The arrangement of the four block-shaped clamping sections here, for example 7a to 7d on the build platform 2nd is then the unit from the building platform 2nd and object 1 clamped closer to the center of gravity or the geometric center of the unit than would be the case if the unit was directly on the construction platform 2nd as would be tensioned in the prior art, as by 1 is easy to imagine.

How from 2nd and 3rd emerges, is used in archetypal shaping by layering in the four block-shaped clamping sections, for example 4a to 4d one opening each 11a to 11d formed, in relation to which in each case by means of an actuator 4a to 4d drivable mandrel 10a to 10d the tensioning device into an in the opening 11a to 11d retracted position and in an out of the opening 11a to 11d extended position is actuated. Then a block-shaped clamping section 7a to 7d in the in the opening 11a to 11d retracted position of the assigned mandrel 10a to 10d clamped positively on the clamping device and in the out of the opening 11a to 11d extended position of the mandrel 10a to 10d released from the clamping device.

For tensioning the unit from the construction platform 2nd and object 1 in the clamping device of the cleaning device, the unit is therefore first according to 3rd placed in the clamping device such that the central axes of the mandrels 10a to 10d with the central axes of the openings 11a to 11d cursed, but the mandrels 10a to 10d in relation to the openings 11a to 11d extended position. Then the actuators become, for example, by the control device 4a to 4d the mandrels 10a to 10d actuated so that these in the assigned openings 11a to 11d drive in what is indicated by the dashed arrows in 3rd is symbolized and thereby the mandrels 10a to 10d in engagement with the openings 11a to 11d devices.

How from 1 emerges are the actuators 4a to 4d , here for example in the form of pneumatic actuating cylinders together with the mandrels actuated by them 10a to 10d about actuator mounts 5a to 5d on a turntable 6 attached.

How best 1 and 3rd show, are in the embodiment described here on one side of the building platform 2nd for example two first, with two first mandrels 10a cooperating openings 11a and on the opposite side of the build platform 2nd for example two second, with two second mandrels 10b cooperating opening 11b formed, the mouths of the first openings 11a and the second openings 11b point away from each other. Furthermore, the first mandrels 10a and the second mandrels 10b in relation to the openings 11a , 11b each can be operated in opposite directions to the retracted position and the extended position.

As best with the help of 3rd there are openings assigned to each other 11a , 11b and the mandrels 10a , 10b formed such that they have interlocking, complementarily conical cross sections. Then the unit becomes a building platform 2nd and object 1 advantageously centered when the mandrels are conical in cross section 10a , 10b in the assigned cross-sectional openings 11a , 11b immerse and then the conically shaped radially outer peripheral surfaces of the mandrels 10a , 10b to the complementary conical radially inner peripheral surfaces of the openings 11a , 11b invest.

How 1 shows is the turntable 6 here, for example, about a vertical axis by means of a first motor of a swiveling device, not shown here 120 rotatable, in particular at an angle of 0 to 360 degrees, as symbolized by the circular arrow. Furthermore, the turntable 6 via a swivel arm 8th on a pivot bearing 9 attached, which is a rotation of the rotating arm 8th around a horizontal axis by means of a second motor Swivel device 120 enables. By means of the swivel device 120 can then by the clamping device 110 tense unit from object 1 and build platform 2nd can be rotated into a variety of positions, which is a gravity-related loosening of loose, unconsolidated powdery building material by the cleaning device 100 allowed. The swivel device 120 together with motors is then part of the cleaning device 100 and is also controlled, for example, by the second electronic control device.

It also works with the turntable 6 a jogger 3rd as another part of the cleaning device 100 together, which is the turntable 6 and with it the tensioning device 110 and thus also the unit from the building platform stretched on it 2nd and object 1 vibrated to remove loose powder particles due to centrifugal forces from the object 1 and to replace the construction platform. The control of the vibrator 3rd takes place in turn by the second electronic control device of the cleaning device 100 .

Reference list

1

object

2nd

Construction platform

3rd

Jogger

4a to 4d

Actuators

5a to 5d

Actuator mounts

6

Turntable

7a to 7d

Clamping sections

8th

Swivel arm

9

Pivot bearing

10a to 10d

Mandrels

11a to 11d

openings

100

Cleaning device

110

Clamping device

120

Swivel device

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for better information for 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

• WO 2015/071184 A1 [0002]

Claims (24)

Method for producing a three-dimensional object (1) on a building platform (2) by layer-by-layer application and selective solidification of a powdery building material, the method comprising the following steps: a) producing the building platform (2), and then b) producing the three-dimensional object ( 1) by layer-by-layer application and selective solidification of the powdery building material on the building platform (2), a cohesive connection being produced between the building platform (2) and the object (1), and then c) the object (1) and the building platform ( 2) are clamped over at least one clamping section (7a to 7d) in a clamping device (110) of a cleaning device (100), and that then d) at least the object (1) is cleaned from surrounding, unconsolidated powdery building material by the cleaning device (100) , characterized in that e) the at least one clamping section (7a to 7d) during the manufacture positioning of the object (1) by layer-wise application and selective solidification of the powdered building material on the building platform (2). Procedure according to Claim 1 , characterized in that the at least one clamping section (7a to 7d) serves no other purpose than to be clamped in the clamping device (110) of the cleaning device (100). Procedure according to Claim 1 or 2nd , characterized in that the at least one clamping section (7a to 7d) is formed separately from the object (1) on the construction platform (2). Procedure according to Claim 3 , characterized in that the at least one clamping section (7a to 7d) remains on the building platform (2) and the building platform (2) together with the at least one clamping section (7a to 7d) as a building platform for producing a further three-dimensional object by layer-wise application and selective solidification of powdered building material is used on the building platform. Procedure according to Claim 1 or 2nd , characterized in that the at least one clamping section (7a to 7d) is formed on the object (1). Procedure according to Claim 5 , characterized in that the at least one clamping section (7a to 7d) is separated from the object (1) or left on the object (1) before or after cleaning the object (1). Method according to one of the preceding claims, characterized in that the object (1) is separated from the building platform (2) before or after cleaning. Method according to one of the preceding claims, characterized in that the selective solidification of the powdered building material takes place by means of high-energy radiation. Method according to one of the preceding claims, characterized in that during the production of the at least one clamping section (7a to 7d) in the at least one clamping section (7a to 7d) at least one opening (11a to 11d) is formed, with respect to which at least one by means of an actuator (4a to 4d) drivable mandrel (10a to 10d) of the clamping device (110) in a position retracted into the opening (11a to 11d) and in a position extended out of the opening (11a to 11d), the at least one clamping section (7a to 7d) in the position of the mandrel (10a to 10d) retracted into the opening (11a to 11d) on the clamping device (110) in a form-fitting manner and in the position of the mandrel extended from the opening (11a to 11d) (10a to 10d) is released from the tensioning device (110). Procedure according to Claim 9 characterized in that at least one first opening (11a to 11d) cooperating with a first mandrel (10a to 10d) and at least one second opening (11a. cooperating with a second mandrel (10a to 10d) separate from the first mandrel) to 11d) is formed, the mouths of the first opening and the second opening (11a to 11d) pointing away from one another and the first mandrel and the second mandrel (10a to 10d) each actuating in opposite directions into the retracted position and into the extended position will. Procedure according to Claim 10 , characterized in that the at least one opening (11a to 11d) and the at least one mandrel (10a to 10d) are formed such that they have interlocking, complementarily conical cross sections. Apparatus for producing a three-dimensional object (1) on a building platform (2) by layer-wise application and selective solidification of a powdery building material, with: a) A process chamber in which the layer-wise application and selective hardening of the powdery building material takes place on the building platform, between of the construction platform (2) and the object (1), a material connection is created, b) a control system which applies the layers and the selective solidification of the controls the powdery building material on the building platform (2) in a coordinated manner, c) a cleaning device (100) which cleans at least the object (1) after the production of surrounding, unconsolidated powdery building material, wherein d) the object (1) and the building platform ( 2) during cleaning in the cleaning device (100) via at least one clamping section (7a to 7d) are clamped in a clamping device (110) of the cleaning device (100), characterized in that e) the control is designed such that the at least one Clamping section (7a to 7d) is formed during the production of the object (1) by layer-wise application and selective solidification of the powdery building material on the building platform (2). Device after Claim 12 , characterized in that the at least one clamping section (7a to 7d) serves no other purpose than to be clamped in the clamping device (110) of the cleaning device (100). Device after Claim 11 or 12th , characterized in that the at least one clamping section (110) is formed separately from the object (1) on the building platform (2). Device after Claim 11 or 12th , characterized in that the at least one clamping section (7a to 7d) is formed on the object (1). Device according to one of the Claims 12 to 15 , characterized in that a radiation source generating high-energy radiation is provided, the selective solidification of the powdered building material being carried out by means of the high-energy radiation. Device according to one of the Claims 12 to 16 , characterized in that at least one opening (11a to 11d) is formed in the at least one clamping section (7a to 7d), in relation to which at least one clamping mandrel (10a to 10d) of the clamping device (10a to 10d) which can be driven by an actuator (4a to 4d) 110) can be actuated into a position retracted into the opening (11a to 11d) and into a position extended out of the opening (11a to 11d), the at least one clamping section (7a to 7d) in the into the opening (11a to 11d) retracted position of the mandrel (10a to 10d) on the tensioning device (110) is positively tensioned and in the position of the mandrel (10a to 10d) extended from the opening (11a to 11d) is released from the tensioning device (110). Device after Claim 17 characterized in that at least one first opening (11a to 11d) cooperating with a first mandrel (10a to 10d) and at least one second opening (11a. cooperating with a second mandrel (10a to 10d) separate from the first mandrel) to 11d), the mouths of the first opening and the second opening (11a to 11d) pointing away from one another and the first mandrel and the second mandrel (10a to 10d) each being operable in opposite directions to the retracted position and the extended position are. Device after Claim 18 , characterized in that the at least one opening (11a to 11d) and the at least one mandrel (10a to 10d) are designed such that they have interlocking, complementarily conical cross sections. Device according to one of the Claims 17 to 19th , characterized in that the at least one actuator (4a to 4d) is formed by a pneumatically, hydraulically or electrically driven actuating cylinder or by an electric servomotor. Device after Claims 12 , characterized in that the cleaning device has a pressure medium cleaning device which generates a cleaning pressure medium jet in a pressure medium channel, an opening of the pressure medium channel being directed at least onto the object and the object (1) being cleaned with the aid of pressure medium emerging from the opening. Device after Claim 21 , characterized in that the pressure medium channel of the pressure medium cleaning device is formed in the at least one clamping section (7a to 7d). Device according to one of the Claims 12 to 22 , characterized in that the cleaning device (100) has a pivoting device (120) through which the clamping device (110) can be pivoted about at least one axis. Device according to one of the Claims 12 to 23 , characterized in that the cleaning device (100) has a vibrating device (3), by means of which the tensioning device (110) can be vibrated in at least one plane.

Images