EP3478434A1 - Vorrichtung zum laserschmelzen mit mehreren absaugvorrichtungen - Google Patents
Vorrichtung zum laserschmelzen mit mehreren absaugvorrichtungenInfo
- Publication number
- EP3478434A1 EP3478434A1 EP17758423.2A EP17758423A EP3478434A1 EP 3478434 A1 EP3478434 A1 EP 3478434A1 EP 17758423 A EP17758423 A EP 17758423A EP 3478434 A1 EP3478434 A1 EP 3478434A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- building board
- suction devices
- protective gas
- suction
- process chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/32—Process control of the atmosphere, e.g. composition or pressure in a building chamber
- B22F10/322—Process control of the atmosphere, e.g. composition or pressure in a building chamber of the gas flow, e.g. rate or direction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/70—Gas flow means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/364—Conditioning of environment
- B29C64/371—Conditioning of environment using an environment other than air, e.g. inert gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Definitions
- the present invention relates to a device for selective laser melting with a process chamber, which is surrounded by a housing, arranged in the process chamber, lowerable building board, wherein on the building board an object to be produced is built up in layers by laser irradiation, at least one protective gas inlet, by the inert gas in the process chamber flows in, preferably substantially parallel to the building board, at least one suction device, through which the process products produced during laser welding are extracted.
- the protective gas flow is currently generated as far as possible in parallel with the building board or the powder layer present on the building board.
- the protective gas is supplied along one side of the building board, flows over the building board to the opposite side, where it is sucked off by a suction device arranged along this opposite side and removed from the process space.
- the object of the invention is to provide a device for the selective laser melting moiszustel len, which avoids the above disadvantages.
- a plurality of protective gas inlets are arranged around the building board at a first height relative to the building board, or a single protective gas inlet surrounding the building board is arranged.
- the flow of inert gas from several directions takes place approximately to the center of the building board.
- an ascending flow is generated, in which inert gas and process products, such as smoke, condensates, spatter and the like, are included.
- At least one further height relative to the building board a plurality of suction devices may be arranged along an imaginary closed form or a single suction device may be arranged with a closed shape.
- the process products or the process gas are transported further upwards and sucked off.
- unwanted deposits of process products can be counteracted.
- the suction devices are not provided along only one side and at the same height as the flow inlet, so that optimized flow conditions can be achieved throughout the installation space.
- the suction devices or the individual suction device be arranged at several different heights, which differ from the height of the inert gas inlets. Accordingly, process products can be vacuumed at different heights above the building board. Overall, such an arrangement of suction devices at different heights can generate a kind of upward suction, so that process products can be effectively kept away from the building board.
- the suction devices can surround the building board.
- the imaginary closed shape or closed shape of the individual suction device may be a rectangle or a circle or a polygon.
- the imaginary shape is to be understood as being a type of outline along which the suction devices are arranged or aligned. If, for example, a rectangle is formed as an imaginary shape, two suction devices, for example, could be arranged next to each other along the long sides, with only one suction device being arranged on each short side. This can of course be achieved by different lengths suction devices. Analogously, six suction devices can be arranged along an imaginary hexagon.
- the individual suction device may also take the form of a circle or a rectangle or a polygon.
- the circular shape of a single suction device is advantageous in terms of generating a uniform suction in the process chamber.
- the device may have a control device, which is set up to control the suction devices or the individual suction devices of a respective height separately from each other, such that different flow rates can be generated at different heights above the building board.
- a flow velocity profile can be generated along the vertical direction, wherein a maximum suction speed or a largest suction volume is generated, in particular, at the highest suction device.
- the control unit can furthermore be designed to control the inflowing inert gas volume and the volume of fluid to be suctioned off so that a flow is generated in the process chamber, which is set up, in particular in the region of the incident laser beam, to process products such as condensate, spatter, and the like To transport building plate away, preferably suck out of the process chamber.
- the flow can also be such that heavy particles entrained in the process gas, such as shatter splashes or the like, only fall back to the bottom of the process chamber outside the construction surface or building board so that they do not fall down in the powder-coated construction area.
- control unit may be configured to shift a stagnation point of the protective gas flow in the region of the building board, such that the stagnation point can be moved in dependence on a beam path of a laser. In this way, reliable removal of process gases can be made possible; in particular, the blast path of the laser can be kept as free as possible of smoke, particles and the like.
- the protective gas inlets and the suction devices may be fluid-tightly connected to the housing.
- the suction devices are movable relative to the housing. In this way, the aspiration of process products or process gas could be adjusted with respect to the current position of the laser melting.
- Fig. 1 shows in a simplified and schematic presen- tation a device for selective laser melting A) in a perspective view, B) in a Thomasdar- position and C) in a plan view.
- FIG. 2 shows in a simplified and schematic representation the device of FIG. 1 with differently configured suction devices A) in a sectional view and B) in a plan view.
- Fig. 3 is a schematic sectional view in which a velocity profile is drawn qualitatively.
- Fig. 4 shows in the partial figures A) to C) in simplified and schematic representations of a respective plan view with different possibilities of arrangement of suction devices.
- FIG. 1 shows, in simplified and schematic form, a device 10 for selective laser melting in various views.
- the device 10 which may also be referred to as an SLM system, comprises a process chamber 12, which is surrounded by a housing 14.
- the housing 14 is formed in particular by side walls 16, a bottom wall 18 and a top wall 20.
- a work surface 24 is provided in the area of the outer wall 1 8, in particular in a recess 22 in the bottom wall 1 8, a work surface 24 is provided in the area of the outer wall 1 8, in particular in a recess 22 in the bottom wall 1 8, a work surface 24 is provided in the area of the outer wall 1 8, in particular in a recess 22 in the bottom wall 1 8, a work surface 24 is provided in the area of the outer wall 1 8, in particular in a recess 22 in the bottom wall 1 8, a work surface 24 is provided in the area of the outer wall 1 8, in particular in a recess 22 in the bottom wall 1 8, a work surface 24 is provided in the area of the outer wall 1 8,
- At least one protective gas inlet 26 and at least one suction device 28 are in fluid communication with the process chamber 12.
- a circular protective gas inlet 26 and a plurality of circular suction devices 28a, 28b are shown by way of example. 28c shown.
- the protective gas inlet 26 and the suction devices 28a, 28b, 28c are arranged at different heights H1, H2, H3, H4.
- the apparatus 10 has at least one laser source 30 which can generate a laser beam 32 to weld the powder (not shown) on the building board 24.
- the laser source 30 is movable relative to the housing 14 in at least two directions parallel to the plane of the work surface 24.
- the direction of flow of inert gas is indicated substantially parallel to the structural panel or the current construction area or powder layer in the region of the protective gas inlet with double arrows.
- the protective gas which flows in essentially horizontally or along the powder layer, is strongly heated, in particular in the region of the impinging laser beam 32, and rises.
- the so-called process gas is produced, which in particular also contains smoke, condensate, welding beads and the like.
- the process gas is sucked off by means of the suction devices 28a, 28v, 28c arranged above the protective gas inlet 26.
- the suction is indicated.
- H2, H3, H4 suction devices 28a, 28b, 28c By means of the arranged at different heights H2, H3, H4 suction devices 28a, 28b, 28c, a kind of suction in the process chamber 1 2 can be generated.
- the suction effect serves in particular to reliably transport the process gases upwards away from the powder layer to be processed. In this case, depending on the strength of the suction effect, it is also possible to suck off beads of sweat that would otherwise otherwise fall into the powder layer at another (undesired) point.
- Fig. I C the device 10 is shown in a strak simplified plan view. Shown are the bottom plate 24, the top suction device 28c and the side walls 16 of the housing. This representation serves in particular to illustrate the geometric shape or arrangement of the suction devices 281, 28b, 28c.
- the suction device 28a, 28b, 28c shown in FIG. 1, although not shown, are suitably connected to the housing, so that extracted process gas can be removed from the process chamber 1 2.
- the suction devices are connected to the housing both mechanically and fluid-tight.
- the suction devices 28a, 28b, 28c can also be connected by means of further (not illustrated) fluid lines leading to an outside of the housing 14.
- FIGS. 2A) and B) show a device 10 which likewise has a building board 24 and a protective gas inlet 26.
- Ebenfal ls at different heights H2, H3, H4 with respect to the level BP of the building board 24 and a current powder layer to be processed suction devices 128a, 128b, 128c are provided.
- these suction devices are arranged relatively movable to the housing 14, which by the two Pfei le in Fig. 2B) and the suction device shown in dashed lines.
- the suction devices are connected to the laser source 30. In this way, it can be achieved that the suction effect is generated directly in the region of the active laser beam 32.
- suction devices 128a, 128b, 128c can also be connected to a movement device separate from the laser source 30 so that the suction devices 128a, 128b, 128c are not common with the laser source 30 can be moved or must.
- FIG. 3 shows a velocity profile 40 along a side wall 16 of the device 10, which indicates, by way of example and purely qualitatively, possible flow velocities or volume flows that can be generated by the suction devices 28a, 28b, 28c.
- the uppermost suction device 28c generates the greatest flow velocity
- the suction devices 28b and 28a which are closer to the building board 24, produce lower suction volumes.
- a process gas cloud 36 is indicated in the laser beam 32 in which smoke, condensate, welding beads and the like are contained and which can be sucked off approximately along the arrows shown by the suction effect of the suction devices 28a, 28b, 28c ,
- FIG. 4 different examples of the arrangement of suction devices 28 are shown.
- a plurality of suction devices 28- 1 to 28-4 are arranged around the building board 24 at the respective heights.
- the suction devices 28-1 to 28-4 are arranged along the sides of the building board 24, ie along an imaginary contour or line of a rectangle.
- FIGS. 4A) and 4B) are examples of the fact that not only individual suction devices need to be arranged at a height H2, H3, H4 (FIGS. 1B, 2A), but rather that a plurality of separate suction devices are provided around the building board 24 28- 1 to 28-8 can be provided.
- Fig. 4C finally shows a single suction device 28, which is in the form of a hexagon.
- the arrangement or shaping of a plurality of suction devices or a single suction device can be selected.
- individual suction devices may have the shape of a rectangle or an octagon.
- several circular arc-shaped suction can be added to a complete circle with each other. All of these exemplary embodiments of FIGS. 1 and 4 have in common that they surround the building board 24. For all embodiments, the following should be noted.
- the device 10 has a control device which is not explained here in detail, which is set up to control the suction devices 128 or the individual suction devices 28 of a respective height H2, H3, H4 separately such that different flow rates can be generated at different heights above the building board 24 are.
- the control unit can also be set up to control the inflowing protective gas volume and the fluid volume to be suctioned off (process gas) such that a flow is generated in the process chamber 12, which is set up in particular in the region of the impinging laser beam 32, process products such as condensate, spatter , and the like, to be transported away from the building board 24, preferably to be sucked out of the process chamber 12.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016212082.4A DE102016212082A1 (de) | 2016-07-04 | 2016-07-04 | Vorrichtung zum Laserschmelzen mit mehreren Absaugvorrichtungen |
PCT/DE2017/000191 WO2018006888A1 (de) | 2016-07-04 | 2017-07-04 | Vorrichtung zum laserschmelzen mit mehreren absaugvorrichtungen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3478434A1 true EP3478434A1 (de) | 2019-05-08 |
Family
ID=59738089
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17758423.2A Withdrawn EP3478434A1 (de) | 2016-07-04 | 2017-07-04 | Vorrichtung zum laserschmelzen mit mehreren absaugvorrichtungen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3478434A1 (de) |
DE (1) | DE102016212082A1 (de) |
WO (1) | WO2018006888A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019134812A1 (de) * | 2019-12-17 | 2021-06-17 | Chiron Group Se | Vorrichtung zur Beschichtung von Bremsscheiben |
CN112060588A (zh) * | 2020-09-01 | 2020-12-11 | 杭州德迪智能科技有限公司 | 成型仓排烟系统及粉末床3d打印设备 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004031881B4 (de) * | 2004-06-30 | 2007-11-22 | Cl Schutzrechtsverwaltungs Gmbh | Vorrichtung zum Absaugen von Gasen, Dämpfen und/oder Partikeln aus dem Arbeitsbereich einer Laserbearbeitungsmaschine |
DE102006052292A1 (de) * | 2006-11-03 | 2008-05-08 | Lpkf Laser & Electronics Ag | Vorrichtung und Verfahren zur Bearbeitung eines Werkstücks mittels eines Laserstrahls |
JP6530383B2 (ja) * | 2013-06-11 | 2019-06-12 | レニショウ パブリック リミテッド カンパニーRenishaw Public Limited Company | 積層造形装置および方法 |
DE102014209161A1 (de) * | 2014-05-14 | 2015-11-19 | Eos Gmbh Electro Optical Systems | Steuereinheit, Vorrichtung und Verfahren zum Herstellen eines dreidimensionalen Objekts |
DE102014212100A1 (de) * | 2014-06-24 | 2015-12-24 | MTU Aero Engines AG | Generatives Herstellungsverfahren und Vorrichtung hierzu mit entgegengesetzt gerichteten Schutzgasströmen |
EP3015197B1 (de) * | 2014-10-30 | 2017-03-08 | MTU Aero Engines GmbH | Vorrichtung zur Herstellung oder Reparatur eines dreidimensionalen Objekts |
-
2016
- 2016-07-04 DE DE102016212082.4A patent/DE102016212082A1/de not_active Withdrawn
-
2017
- 2017-07-04 EP EP17758423.2A patent/EP3478434A1/de not_active Withdrawn
- 2017-07-04 WO PCT/DE2017/000191 patent/WO2018006888A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
DE102016212082A1 (de) | 2018-01-04 |
WO2018006888A1 (de) | 2018-01-11 |
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