WO2020074127A1 - Dispositif distributeur de poudre - Google Patents

Dispositif distributeur de poudre Download PDF

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Publication number
WO2020074127A1
WO2020074127A1 PCT/EP2019/054803 EP2019054803W WO2020074127A1 WO 2020074127 A1 WO2020074127 A1 WO 2020074127A1 EP 2019054803 W EP2019054803 W EP 2019054803W WO 2020074127 A1 WO2020074127 A1 WO 2020074127A1
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WO
WIPO (PCT)
Prior art keywords
spring
powder
unit
distributor device
layer forming
Prior art date
Application number
PCT/EP2019/054803
Other languages
English (en)
Inventor
Karl HANSSON
Original Assignee
Arcam Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Arcam Ab filed Critical Arcam Ab
Publication of WO2020074127A1 publication Critical patent/WO2020074127A1/fr

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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
    • 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
    • B22F12/60—Planarisation devices; Compression devices
    • B22F12/67—Blades
    • 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
    • B22F12/22—Driving means
    • B22F12/224—Driving means for motion along a direction within the plane of a layer
    • 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
    • B29C64/307—Handling of material to be used in additive manufacturing
    • B29C64/321—Feeding
    • 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

  • BACKGROUND Freeform fabrication or additive manufacturing (AM) using electron beam melting (EBM) or laser beam melting is a method for forming a solid three-dimensional article from a powder.
  • the three-dimensional article is formed layer by layer by successive fusion of selected areas of powder layers, which selected areas correspond to successive layers of the three- dimensional article.
  • a layer of powder, such as metal powder, is deposited on a build area and an electron beam or a laser beam is used to selectively melt the powder layer of the build area.
  • the melted material fuses with underlaying layers and solidifies to form the top layer of said solid three-dimensional article.
  • a further layer of powder is deposited onto the previous layer, and the electron or laser beam is used to selectively melt the further powder layer of the build area.
  • the melted material solidifies and form another solid layer fused onto the previous solid layer. This process is repeated for multiple layers until the desired 3D geometry of the article is achieved.
  • An apparatus for forming such a three-dimensional article has a build platform on which the three-dimensional article is to be formed, a powder distributor device for the formation of the powder layers on the build platform (build area) and an electron beam source or a laser beam source for providing the energy beam used for melting the powder.
  • the build platform is moveable in the vertical direction and arranged in a build tank.
  • the build tank is arranged in a build chamber formed by a casing.
  • the build chamber is a vacuum chamber.
  • the powder distributor device usually comprises a so-called powder rake displaceably connected to a worktable for forming the powder layers.
  • the powder rake has an elongated rake blade extending across the worktable and the build area.
  • the powder rake is moved relative to the worktable (and the build area) in a horizontal direction substantially perpendicular to the longitudinal main extension direction of the rake blade.
  • large temperature gradients in the apparatus and particular high temperatures of the powder rake may cause problems. For example, if the powder rake has a temperature exceeding the temperature of the worktable, the thermal expansion of the powder rake can exceed the thermal expansion of the worktable.
  • An objective of the invention is to provide a powder distributor device for an additive manufacturing apparatus for forming a three-dimensional article layer by layer from a powder, by which device the problem associated with a powder rake and a powder rake suspension in case of large temperature gradients and high temperatures of the powder rake can be reduced.
  • a powder distributor device for an additive manufacturing apparatus for forming a three-dimensional article layer by layer from a powder
  • the powder distributor device comprises a worktable for receiving powder and a unit displaceably connected to the worktable for forming a powder layer on a build area
  • the powder distributor device comprises a spring suspension arrangement by which arrangement the powder layer forming unit is connected to the worktable for enabling thermal expansion induced movement of the powder layer forming unit relative to the worktable.
  • spring suspension arrangement is meant one or more components making the suspension resilient such that the powder layer forming unit can move relative to the worktable due to thermal expansion causing a larger length change of the powder layer forming unit than corresponding length change of the worktable in the same direction.
  • the spring suspension arrangement enables or allows thermal expansion induced movement of the powder layer forming unit relative to the worktable.
  • worktable should comprise plates, frames and rails (with or without a table-top) along which the powder layer forming unit can be displaced in a guided manner for forming a powder layer.
  • the powder layer forming unit can have an elongated shape and extend across the worktable in a direction substantially perpendicular to the displacement direction of the powder layer forming unit.
  • the spring suspension arrangement is preferably arranged for enabling thermal expansion induced movement of the powder layer forming unit in a longitudinal main extension direction of the powder layer forming unit.
  • the powder layer forming unit can be a powder rake.
  • the spring suspension arrangement comprises a spring element and one end of the powder layer forming unit is connected to the worktable via the spring element.
  • the spring motion of the spring element can compensate for the thermal expansion induced movement of the powder layer forming unit.
  • the spring element is a spring of leaf spring type, since such a spring can be self-supporting without any need of support surfaces that slide against each other for guiding the spring motion.
  • the spring element can have a spring arm with one end fixed and another end which is movable through bending of the spring element.
  • Such a spring element can be arranged to be pre-tensioned by assembling the powder layer forming unit to the worktable.
  • the spring element can be arranged such that the spring motion of the spring element due to thermal expansion induced movement of the powder layer forming unit will result in a decreasing tension in the spring element.
  • the spring suspension arrangement comprises at least one guiding roll arranged to abut against and roll along a guiding surface of the worktable by which guiding roll the powder layer forming unit is displaceable relative to the worktable.
  • a smooth movement of the powder layer forming unit relative to the worktable for forming the powder layer can be achieved.
  • the guiding surface can be an outer surface facing away from the centre of the worktable or the guiding surface can be an inner surface facing towards the centre of the worktable.
  • the guiding surface is preferably arranged in a plane defined by a main extension in a horizonal direction and an extension in a vertical direction.
  • the pivot axis of the guiding roll is then suitably arranged in the vertical direction.
  • said at least one guiding roll is pivotally connected to the spring element for rolling along the guiding surface.
  • the guiding roll can remain in contact with the worktable while any thermal expansion induced movement of the powder layer forming unit being compensated for by spring motion of the spring element.
  • the spring suspension arrangement comprises two said guiding rolls, wherein a first guiding roll is pivotally connected to a first spring part at a first end of the spring element and a second guiding roll is pivotally connected to a second spring part at a second end of the spring element, and preferably the spring element is connected to the powder layer forming unit at a position on the spring element between the first end of the spring element and the second end of the spring element, and the first spring part of the spring element extending between the connection position and the first end of the spring element constitutes a spring for the first guiding roll and the second spring part of the spring element extending between the connection position and the second end of the spring element constitutes a spring for the second guiding roll.
  • the contact force is divided on two guiding rolls and each of the guiding rolls can be individually spring suspended.
  • the spring suspension arrangement comprises a further spring portion in addition to the first spring part and the second spring part, wherein the further spring portion connects the first end of the spring element and the second end of the spring element to each other for transferring forces from the first guiding roll to the second guiding roll or from the second guiding roll to the first guiding roll.
  • the loads can be balanced by the further spring portion.
  • the spring suspension arrangement comprises a support element and the spring element is connected to the support element, wherein the powder layer forming unit and the support element are connected to each other.
  • the support element can be a part of a carriage by which the powder layer forming unit can be displaced relative to the worktable.
  • the spring suspension arrangement comprises a support element and said at least one guiding roll is pivotally connected to the support element for rolling along the guiding surface, wherein the powder layer forming unit and the support element are connected to each other via the spring element.
  • the spring motion of the spring element can compensate for the thermal expansion induced movement of the powder layer forming unit by relative motion between the powder layer forming unit and the support element while the pivot axis of the guiding roll being kept at a fixed position on the support element.
  • the support element can be part of a non-springed carriage by which the powder layer forming unit can be displaced relative to the worktable. For such a carriage having two rolls the contact pressure can be evenly distributed between the rolls.
  • the leaf spring is arranged such that in a cartesian coordinate system (X, Y, Z) a main extension plane of the leaf spring is substantially in parallel with the YZ-plane for enabling the leaf spring to spring mainly in the X-direction, where an upper powder receiving surface of the worktable is arranged substantially in parallel with the XY-plane, and preferably a longitudinal main extension direction of the powder layer forming unit is substantially in parallel with the X- direction.
  • the leaf spring can be effectively used for absorbing thermal expansion induced movement.
  • the spring suspension length has to be adapted to the size and material of the powder layer forming unit and the worktable, and to the current temperatures of the apparatus.
  • the temperature of the powder rake can often exceed the temperature of the worktable by 100-300 degrees.
  • the powder rake and the worktable are made from stainless steel and the powder rake has a length of 500 mm
  • the spring suspension length has to be at least 1.6 mm.
  • the spring suspension length provided by the spring suspension arrangement is of course somewhat longer, but on the other hand the spring suspension length should not be longer than necessary for optimizing the design.
  • the spring suspension length can be in an interval where the constant A is 0.001 and the constant B is 0.02, which according to the formula above gives a spring suspension length in the interval 0.5 - 10 mm, or preferably A is 0.003 and B is 0.01 , which gives a spring suspension length in the interval 1.5 - 5 mm, for a powder rake having a length of 500 mm.
  • a further objective is to provide an additive manufacturing apparatus for forming a three-dimensional article layer by layer from a powder, wherein the apparatus comprises a powder distributor device according to the invention.
  • FIG. 1 is a schematic view of an AM apparatus
  • Figure 2A is a perspective view of a powder distributor device for an AM apparatus
  • Figure 2B shows an enlarged part of Figure 2A
  • Figure 2C is a cross section view of a part of a worktable of the powder distributor device shown in Figure 2A,
  • Figure 3A is an exploded view of a spring suspension arrangement of the power distributor shown in Figure 2A,
  • Figure 3B shows the spring suspension arrangement shown in Figure 3A, in an assembled state
  • Figure 4 is a view from above showing a powder distributor device
  • Figure 5 is a schematic view illustrating a spring suspension length of a spring suspension arrangement
  • Figure 6 shows a variant of a spring suspension arrangement
  • Figure 7 shows a further variant of a spring suspension arrangement
  • Figure 8 shows a further variant of a spring suspension arrangement.
  • three-dimensional structures and the like as used herein refer generally to intended or actually fabricated three-dimensional configurations (e.g., of structural material or materials) that are intended to be used for a particular purpose. Such structures, etc. may, for example, be designed with the aid of a three-dimensional CAD system.
  • electron beam as used herein in various embodiments refers to any charged particle beam.
  • the sources of charged particle beam can include an electron gun, a linear accelerator and so on.
  • Figure 1 shows an AM apparatus 1 for forming a three-dimensional article 2 layer by layer from a powder.
  • the three-dimensional article is formed by successive fusion of selected areas of powder layers, which selected areas correspond to successive layers of the three- dimensional article 2.
  • the apparatus 1 comprises an outer casing 3 forming a build chamber 4, and a build tank 5 arranged inside the casing 3 in the build chamber 4.
  • the apparatus 1 further comprises a build platform 6 having a build plate 7 for receiving powder 8 from a powder hopper 9.
  • An upper surface of the build plate 7 is preferably flat and horizontal and faced upwardly in a vertical direction 10.
  • a cartesian coordinate system (X, Y, Z) is indicated.
  • the vertical direction 10 is parallel with the Z-axis.
  • the build platform 6 is arranged inside the build tank 5.
  • the build platform 6 comprises means for movement of the build plate 7 relative to the build tank 5 in the vertical direction 10, such as a servo motor equipped with a gear, adjusting screws, etc.
  • the apparatus 1 is also provided with a powder distributor device 1 1.
  • the powder distributor device 11 is arranged for forming a thin layer of powder in a build area on the build plate 7 or a powder bed 12 on the build plate 7. During a work cycle the build plate 7 will be lowered for maintaining the position of the top surface of the powder bed 12 relative to the powder distributor device 1 1 when adding powder layers to the powder bed 12.
  • the powder distributor device 11 will be described in detail hereinbelow.
  • the apparatus 1 has an energy beam source 13 arranged for creating an energy beam.
  • the energy beam is used for melting the selected areas of the powder.
  • the energy beam is scanned over the surface of the current powder layer for melting the selected areas.
  • the selected areas of each layer can be based on a model dividing the article to be manufactured in successive layers or slices.
  • the model may be a computer model generated by a CAD (Computer Aided Design) tool.
  • the energy beam source is an electron beam source 13.
  • the electron beam source can be designed in a way well known to the person skilled in the art.
  • the electron beam source may have an electron gun 14 with an emitter electrode which is connected to a high voltage circuit and a current source for accelerating electrons and releasing electrons from the emitter electrode. These electrons form the electron beam.
  • the electron beam source has also focusing coils and deflection coils 15 for directing the electron beam to various positions of the build layer surface.
  • the build chamber 4 can be arranged for maintaining a vacuum environment by means of a vacuum system, which may comprise a turbomolecular pump, a scroll pump, an ion pump and one or more valves.
  • a vacuum system which may comprise a turbomolecular pump, a scroll pump, an ion pump and one or more valves.
  • any other suitable energy beam source can be used.
  • a laser beam source can be designed in a way well known to the person skilled in the art.
  • the laser beam source may have a laser emitter for emitting photons. These photons form the laser beam.
  • the laser beam source has also focusing units and deflection units for directing the laser beam to various positions of the build layer surface.
  • the focusing units can comprise lenses and the deflection units can comprise mirrors.
  • FIGs 2A and 2B show the powder distributor device 1 1 for an AM apparatus.
  • the powder distributor device 1 1 comprises a worktable 16 and a unit 17 displaceably connected to the worktable 16 for forming a powder layer on a build area 18.
  • the build area 18 corresponds to the surface of the build plate 7 shown in Figure 1.
  • the powder layer forming unit 17 is hereinafter exemplified by a powder rake.
  • the cartesian coordinate system (X, Y, Z) is also indicated.
  • the powder rake 17 is displaceable along the worktable in a direction 19 substantially in parallel with the Y-axis. This is also schematically shown in Figure 1.
  • the worktable 16 has suitably a fixed position in the apparatus 1 , whereas the build plate 7 is moveable in the vertical direction 10 as previously described.
  • the powder rake 17 can have an elongated shape and extend across the worktable 16 in a direction substantially perpendicular to the displacement direction 19 of the powder rake 17. Further, a longitudinal main extension direction of the powder rake is preferably substantially in parallel with the X-direction.
  • Figures 2A and 2B further show the distributor device 1 1 comprising a spring suspension arrangement 20 by which arrangement the powder rake 17 is connected to the worktable 16.
  • the spring suspension arrangement 20 enables or allows thermal expansion induced movement of the powder rake 17 relative to the worktable 16.
  • Figure 2B is an enlarged view of a part of Figure 2A where an upper portion of the work table 16 has been cut away for illustration purposes.
  • the spring suspension arrangement 20 comprises a spring element 21 and one end 22 of the powder rake 17 is connected to the worktable 16 via the spring element 21.
  • the spring suspension arrangement 20 may comprise at least one guiding roll 23a, 23b arranged to abut against and roll along a guiding surface of the worktable 16 by which guiding roll 23a, 23b the powder rake 17 is displaceable relative to the worktable 16.
  • the guiding surface 70 can be provided on a guiding rail 71 of the worktable 16.
  • the guiding roll 23a, 23b can be pivotally connected to the spring element 21 for rolling along the guiding surface 70.
  • the spring suspension arrangement 20 preferably comprises two said guiding rolls 23a, 23b as illustrated.
  • the guiding rolls can be pivotally arranged by means of vacuum bearings.
  • Figure 2C shows in a cross section view a part of the worktable 16 with the guiding rail 71 and the guiding roll 23b in contact with each other.
  • the guiding surface 70 is exemplified as an outer surface facing away from the centre of the worktable 16 and having a substantially horizontal main extension
  • the guiding surface can be an inner surface facing towards the centre of the worktable and having a substantially horizontal main extension.
  • the guiding rolls are arranged on the inside of the guiding rail instead of the outside of the guiding rail 71.
  • the guiding surface has also an extension in the vertical direction.
  • the main extension of the guiding surface 70 is arranged in the YZ-plane. See also Figure 2A.
  • the guiding surface 70 can however have a protrusion 72 extending in the horizontal direction along the worktable 16 for engagement with a corresponding guide slot 31 in the guiding roll 23b.
  • a protrusion 72 extending in the horizontal direction along the worktable 16 for engagement with a corresponding guide slot 31 in the guiding roll 23b.
  • only the surface 70b of the protrusion 72 is in contact with the guiding roll 23b.
  • first guiding roll 23a is pivotally connected to a first spring part 21a at a first end 24 of the spring element 21 and a second guiding roll 23b is pivotally connected to a second spring part 21 b at a second end 25 of the spring element 21 .
  • first spring part 21 a and the second spring part 21 b are made in one piece, optionally, these parts could instead be separated constituting two separate pieces of the spring element.
  • Figure 3A shows the spring suspension arrangement 20 in detail in an exploded view (where the powder rake has been omitted), and Figure 3B shows the spring suspension arrangement 20 when assembled.
  • the spring suspension arrangement 20 can have a support element 26 and the spring element 21 is connected to the support element 26. Further, the powder rake and the support element 26 can be connected to each other by any suitable attachment means 27. An attachment means 28 for connection of the spring element 21 and the support element 26 is also shown in Figure 3A.
  • Each of the guiding rolls 23a, 23b can be provided with the guide slot 31 for cooperating with the corresponding protrusion 72 of the guiding surface 70 of the worktable 16.
  • Each of the guiding rolls has a vertical pivot axis 50.
  • one or more stop pins 32 can be arranged for limiting the spring motion.
  • the spring element 21 is connected to the powder rake (here via the support element 26) at a position 29 on the spring element 21 between the first end 24 of the spring element and the second end 25 of the spring element, and the first spring part 21 a of the spring element extending between the connection position 29 and the first end 24 of the spring element 21 constitutes a spring for the first guiding roll 23a and the second spring part 21 b of the spring element extending between the connection position 29 and the second end 25 of the spring element 21 constitutes a spring for the second guiding roll 23b.
  • the spring element 21 is a spring of leaf spring type.
  • the leaf spring is suitably arranged such that in the Cartesian coordinate system a main extension plane of the leaf spring is substantially in parallel with the YZ-plane for enabling the leaf spring to spring mainly in the X-direction.
  • an upper powder receiving surface 30 of the worktable 16 is suitably arranged substantially in parallel with the XY-plane. See also Figure 2A.
  • the spring suspension arrangement 20 is arranged for enabling thermal expansion induced movement of the powder rake 17 in a longitudinal main extension direction of the powder rake 17.
  • FIG 4 shows the powder distributor device 1 1 in a schematic view from above.
  • the powder rake 17 can be moved relative to the worktable 16 in the direction 19 in parallel with the Y-axis.
  • the spring suspension arrangement 20 is arranged in the first end 22 of the powder rake 17, the spring suspension arrangement 20 is arranged in the first end 22 of the powder rake 17, the spring suspension arrangement 20 is arranged in the first end 22 of the powder rake 17, the spring suspension arrangement 20 is arranged.
  • a second end 33 of the powder rake 17 another spring suspension arrangement could be arranged or as illustrated, the second end 33 can be connected to the worktable 16 via a non-springed suspension of a carriage with rolls.
  • AL (schematically indicated in Figure 4) of the powder rake 17 in the longitudinal direction of the powder rake 17 will be absorbed by the spring suspension arrangement 20 at the first end 22 of the powder rake 17.
  • the spring element 21 is arranged to be pre-tensioned by assembling the powder rake 17 to the worktable 16.
  • the pre-tensioned length can correspond to the expected length change of the powder rake 17 due to thermal expansion. Practically, the pre-tension length suitably exceeds the expected length change AL for securing that the guiding rolls will remain in contact with the worktable 16, since when the powder rake 17 is lengthened, the spring force and the contact pressure between the guiding rolls and the worktable will decrease.
  • the spring element can be arranged such that the spring force and the contact pressure between the guiding rolls and the worktable will increase when the temperature is increased and the powder rake is lengthened due to thermal expansion.
  • the temperatures in an AM machine using electron beam melting (EBM) are relatively high and the powder rake 17 arranged close to the build area 18 (see also Figure 2A) will be heated to a temperature exceeding the temperature of the worktable 16.
  • the powder rake temperature exceeds the worktable temperature by at least 100 degrees, often 200 degrees and sometimes 300 degrees or by even more. This in turn will cause thermal expansion of the powder rake 17 relative to the worktable 16.
  • the spring suspension arrangement 20 is arranged to provide a spring suspension length SSL enabling thermal expansion induced movement of the powder rake 17 in a longitudinal main extension direction of the powder rake 17.
  • the spring suspension length SSL is schematically illustrated in Figure 5, where one guiding roll 23 is in contact with the worktable 16 even though the connection point 34 between the powder rake 17 and the spring element 21 is displaced in the X-direction to a new position 34’.
  • a spring suspension length that heavily exceeds the length change due to thermal expansion is often not desired for design reasons.
  • Figure 6 shows a variant of the spring suspension arrangement 20’ of the powder distributor device 1 1.
  • the spring suspension arrangement 20’ comprises a further spring portion 40 in addition to the first spring part 21a and the second spring part 21 b.
  • the further spring portion 40 connects the first end 24 of the spring element 21 and the second end 25 of the spring element 21 to each other for transferring forces from the first guiding roll 23a to the second guiding roll 23b or from the second guiding roll 23b to the first guiding roll 23a.
  • FIG. 7 shows a schematic view of a further variant of the spring suspension arrangement 20” of the powder distributor device 1 1.
  • the spring suspension arrangement 20 comprises a support element 26” and said at least one guiding roll 23a”, 23b” is pivotally connected to the support element 26” for rolling along the guiding surface 70.
  • the spring suspension arrangement 20 preferably comprises two said guiding rolls 23a”, 23b” as illustrated.
  • the guiding rolls can be pivotally arranged by means of vacuum bearings.
  • the powder rake 17 and the support element 26” are connected to each other via the spring element 21”.
  • the spring element 21” is suitably assembled in away making the spring element pre- tensioned.
  • the spring element 21” is preferably a spring arm.
  • the spring element 21” is suitably connected to the support element 26” and the powder rake 17 with fastening means such as screws or similar.
  • the powder distributor device 1 1 may have another such spring suspension arrangement 20” (mirror-inverted) at the opposite side of the worktable 16 for connection of the second end of the powder rake 17.
  • FIG 8 shows a schematic view of a further variant of the spring suspension arrangement 20’” of the powder distributor device 1 1.
  • the spring suspension arrangement 20’ comprises a support element 26”’ and said at least one guiding roll 23a’”, 23b’” is pivotally connected to the support element 26”’ for rolling along the guiding surface 70.
  • the spring suspension arrangement 20”’ preferably comprises two said guiding rolls 23a’”, 23b’” as illustrated.
  • the guiding rolls can be pivotally arranged by means of vacuum bearings.
  • the powder rake 17 (schematically indicated) and the support element 26”’ are connected to each other via the spring element 2T”.
  • the spring element has two spring arms 60, 61. The spring arms are connected to each other in both ends thereof.
  • a first spring arm 60 is connected to the powder rake 17 and the second arm 61 is connected to the support element 26”’.
  • the first arm 60 and the second arm 61 of the spring element 2T” are suitably connected to the powder rake 60 and the support element 26”’, respectively, with fastening means such as screws or similar.
  • the spring element 2T” is assembled in away making the spring element pre-tensioned.
  • the powder distributor device 1 1 may have another such spring suspension arrangement 20”’ (mirror- inverted) at the opposite side of the worktable 16 for connection of the second end of the powder rake 17.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un dispositif distributeur de poudre (11) destiné à un appareil de fabrication additive qui permet de former un article tridimensionnel, couche par couche, à partir d'une poudre. Le dispositif distributeur de poudre (11) comprend un plan de travail (16) et une unité (17) reliée mobile au plan de travail afin de former une couche de poudre sur une zone de construction. Le dispositif distributeur de poudre (11) comprend un agencement de suspension à ressort (20) par lequel l'unité de formation de couche de poudre (17) est reliée au plan de travail (16) afin de permettre un mouvement induit par dilatation thermique de l'unité de formation de couche de poudre par rapport au plan de travail.
PCT/EP2019/054803 2018-10-10 2019-02-27 Dispositif distributeur de poudre WO2020074127A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201862743910P 2018-10-10 2018-10-10
US62/743,910 2018-10-10

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WO2020074127A1 true WO2020074127A1 (fr) 2020-04-16

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Citations (4)

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