WO2016083234A1 - Procédé et appareil de fabrication d'additif - Google Patents

Procédé et appareil de fabrication d'additif Download PDF

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Publication number
WO2016083234A1
WO2016083234A1 PCT/EP2015/077099 EP2015077099W WO2016083234A1 WO 2016083234 A1 WO2016083234 A1 WO 2016083234A1 EP 2015077099 W EP2015077099 W EP 2015077099W WO 2016083234 A1 WO2016083234 A1 WO 2016083234A1
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WO
WIPO (PCT)
Prior art keywords
construction material
binding
deposition
unit
build region
Prior art date
Application number
PCT/EP2015/077099
Other languages
English (en)
Inventor
Hans KIMBLAD
Original Assignee
Digital Metal 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 Digital Metal Ab filed Critical Digital Metal Ab
Publication of WO2016083234A1 publication Critical patent/WO2016083234A1/fr

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Classifications

    • 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
    • B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • 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
    • B22F10/10—Formation of a green body
    • B22F10/14—Formation of a green body by jetting of binder onto a bed of metal powder
    • 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
    • B22F12/50—Means for feeding of material, e.g. heads
    • 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
    • B22F12/50—Means for feeding of material, e.g. heads
    • B22F12/55—Two or more means for feeding material
    • 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
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • B29C31/04—Feeding of the material to be moulded, e.g. into a mould cavity
    • B29C31/042—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds
    • 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
    • B29C64/10—Processes of additive manufacturing
    • B29C64/165—Processes of additive manufacturing using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber
    • 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
    • B33Y10/00—Processes of additive manufacturing
    • 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
    • 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
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
    • 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
    • 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
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/001—Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material
    • 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 disclosure relates to methods of manufacCuring an object, and particularly to methods of manufacturing object in which the object is constructed from a series of layers of construction material, regions of each of which are selectively bound together during or after the deposition of the layer, and before the deposition of a successive layer.
  • the present disclosure also relates to manufacturing apparatus suitable for implementing such methods .
  • Three-dimensional printing is a class of additive manufacturing technologies in which sequential layers of material are deposited into a build region, portions of each layer being joined together so that a desired object is constructed by the joined portions of the sequential layers .
  • One three-dimensional printing technique employs a process in which sequential layers of a granular material, such as a powder, are deposited into a build region from a print head which passes over and across the build region. After or during deposition of the layer, portions of the build material are selectively bound together.
  • a liquid binder may be jetted from the print head onto the powder using a technique similar to ink-jet printing.
  • Such a binder may be an adhesive which solidifies or cures , thereby to bind the granules of the granular material together, over time, for example by contact with the air in the case of an air-drying adhesive, or after curing, for example using ultraviolet light in the case of a UV-curable adhesive.
  • radiation may be selectively applied to portions of each layer to locally bind regions of the layer together, for example by the application of a suitably high- intensity laser beam or focussed infrared radiation.
  • the deposited layers of powder are made sufficiently thin such that, when successive layers of powder are deposited having selective regions bound together, the bound parts of each layer extend through the layer to the boundary with an underlying layer so as to form a contiguous three- dimensional structure extending through the layers,
  • 3D printing must be able to manufacture a desired object rapidly.
  • an additive manufacturing apparatus comprising a build region.
  • the apparatus comprises a construction material deposition unit arranged for relative reciprocating movement in at least a first direction across the build region for depositing a construction material incrementally in layers on the build region from a construction material deposition position on the construction material deposition unit.
  • the apparatus comprises a first binding unit arranged for relative reciprocating movement in at least the first direction across the build region for binding construction material selectively at positions on the layers of construction material deposited on the build region from a first binding position on the first binding unit.
  • the apparatus comprises a second binding unit arranged for relative reciprocating movement in at least the first direction across the build region for binding construction material selectively at positions on the layers of construction material deposited on the build region from a second binding position on the second binding unit.
  • the first binding position, the construction material deposition position and the second binding position are arranged in order in the first direction.
  • an additive manufacturing apparatus comprising a build region.
  • the apparatus comprises a first construction material deposition unit arranged for relative reciprocating movement in at least a first direction across the build region for depositing a first construction material incrementally in layers on the build region from a construction material deposition position on the first construction material deposition unit.
  • the apparatus comprises a binding unit arranged for relative reciprocating movement in at least the first direction across the build region for binding construction material selectively at positions on the layers of construction material deposited on the build region from a binding position on the binding unit.
  • the apparatus comprises a second construction material deposition unit arranged for relative reciprocating movement in at least the first direction across the build region for depositing a second construction material incrementally in layers on the build region from a second construction material deposition position on the second construction material deposition unit.
  • the first construction material deposition position, binding position and second construction material deposition position are arranged in order in the first direction.
  • the deposition and binding units are provided on a common carriage arranged for reciprocating movement in the first direction. In one embodiment, the deposition and binding units are provided on respective separate carriages, each being arranged for reciprocating movement in the first direction, In one embodiment, a smoothing element is arranged between each deposition and binding position of the deposition and binding positions and the next deposition or binding positions of the deposition and binding positions in. order ,
  • each binding unit is a binder deposition unit arranged to deposit binder material selectively at positions on previously-deposited construction material thereby to bind the construction material selectively.
  • the construction material deposition units are arranged for obtaining construction material from a common reservoir.
  • an additive manufacturing method comprises a process of depositing construction material in a second layer on a build region from, a construction material deposition position on a construction material deposition unit while the construction deposition material deposition unit relatively moves in at least a first direction across the build region.
  • the method comprises a process of binding selectively positions on the first layer of construction material from a first binding position on a first binding unit while the first binding unit relatively moves in at least the first direction across the build region.
  • the first binding position is arranged on a first side of the construction material position.
  • the first side is a side in a direction opposite to the first direction.
  • the method comprises a process of depositing construction material in a second layer on the first layer from the construction material deposition position on the construction material deposition unit while the construction material deposition unit relatively moves in a direction opposite to the first direction across the build region.
  • the method comprises a process of binding selectively positions on the second layer of construction material from a second binding position of a second binding unit while the second binding unit relatively moves in the direction, opposite to the first direction across the build region.
  • the second binding deposition position is arranged on a second side of the construction material deposition position. The second side is a side in the first direction.
  • an additive manufacturing method comprises a process of depositing construction material in a layer on a build region from a first construction material deposition position on a first construction material deposition unit while the first construction material deposition unit relatively moves in a first direction across the build region.
  • the method comprises a process of binding selectively positions on the first layer from, a binding position on a binding unit while the binding unit relatively moves in the first direction across the build region.
  • the first construction material deposition position is arranged on a first side of the binding position. The first side is a side in a direction opposite to the first direction.
  • the method comprises a process of depositing construction material in a second layer on the first layer from a second construction material deposition position of a second construction material deposition unit while the second construction material deposition unit relatively moves in a direction opposite to the first direction across the build region.
  • the second construction material deposition position is arranged on a second side of the binder material deposition position.
  • the second side is a side in the first direction.
  • the method comprises a process of binding selectively positions on the second layer from the binding position on the binding unit while the binding unit relatively moves in the direction opposite to the first direction across the build region.
  • the deposition and binding units are provided on a common carriage arranged for reciprocating movement in the first direction, In. one implementation, the deposition and binding units are arranged on respective separate carriages, each of which is arranged for reciprocating movement in the first direction, In one implementation, the method comprises a process of, after depositing each layer of construction material, smoothing the deposited layer of construction material with a smoothing element arranged between the deposition position for the deposited layer and the binding position for the deposited layer.
  • each binding unit deposits binder material selectively at positions on previously-deposited construction material thereby to bind the construction material selectively.
  • the construction material deposited by each construction material deposition unit is obtained from a common reservoir.
  • the binding is performed simultaneously with the deposition for each of the first direction and the second direction, respectively.
  • Figures 1 to 3 show steps in one implementation of the present disclosure in a schematic manufacturing apparatus ;
  • Figure 4 shows a schematic view of a print head used in the present disclosure,- and
  • FIGS. 5 to 7 show steps in another implementation of the present disclosure in a schematic manufacturing apparatus
  • the present disclosure relates to 3D printing technologies in which an object is constructed from a series of successively deposited layers, portions of which are joined together both within the layer and with portions of an underlying layer.
  • the present disclosure relates to powder bed 3D printing, in which layers of powder are successively deposited, regions of each layer being bound together to form portions of a desired object before the next successive layer is deposited.
  • FIG. 1 shows a schematic view of a powder bed and ink jet head 3D printing apparatus 10, 3D printing apparatus 10 has a print table 11, into an upper surface of which well 12 is formed.
  • displaceable platform 13 which is arranged to be displaceable within well 12 in a first direction Z which, in the configuration of Figure 1, is perpendicular to a surface plane of table 11.
  • platform 13 is supported by retractable supports, not shown, which are retractable in a controlled manner to effect the lowering of platform 13 into well 12.
  • the retractable supports may be provided with toothed portions which enable the supports to be retracted in a controlled manner through the operation of toothed wheels, in the manner of a rack and pinion drive.
  • retractable supports may be faydraulically retractable or retractable by some other means, as may be desired.
  • Apparatus 10 also includes print head 15 , which is arranged to traverse above well 12 in a first direction X, while being supported above the well as it translates.
  • print head 15 is supported on rail 16, along which it is arranged to move.
  • Print head 16 may be moved in a reciprocating fashion over well 12 by, for example, a drive belt, a drive screw, an internal drive motor or any other suitable means.
  • print head 15 is able to transverse the full extent of well 12 in the X- direction. It must be noted that, while the illustration of
  • Figure 1 depicts the X-Z plane in transverse section
  • well 12 has extent in a third direction Y perpendicular to the X and Z directions and, for example, extending out of the page.
  • Table 11, well 12 and platform 13 have extent in this direction also, but have no further special limitation as to the shape or dimension in this direction.
  • well 12 when viewed along the Z-direction, well 12 could have a rectangular or square shape in. plan, view, but also could have other shapes, including polygonal or circular.
  • the cross- section of well 12 does not vary with extent in the 2 direction, while platform 13 has a plan view so as to be a close fit to the vertical walls of well 12 relative to which platform 13 moves.
  • Platform 13 may be provided with seals, such as resilient wipers, at each edge to allow such a seal to be provided.
  • Print head 15 also has extent in the Y direction such that print head 15 is able to pass across the entire X-Y cross-sectional extent of well 12. This can be achieved by providing a print head 15 which extends the full length of the well in the y ⁇ direction. Alternatively, this can be achieved by providing a print head, one or more components of which are arranged to reciprocate in the Y-direction to scan the surface of the well in a raster fashion, such that, as the print head traverses the well in the X-direction, whether continuously or stepwise, the component of the print head which scans in the Y-direction passes across every point of the well .
  • print head 15 includes powder dispenser 15b adapted to dispense a layer of powder into well 12 as print head 15 traverses the well .
  • powder dispenser 15b may have a dispensing orifice which extends the full width of well 12 in the Y-direction such that, when the print head 15 traverses well 12 , a full layer of powder may be dispensed from the orifice.
  • the powder dispenser 15b may be formed as a scanning component which dispenses successive rows of powder in the Y-direction, the rows being arranged sequentially in the X-direction
  • Print head 15 also includes two binding units 15a and 15c, respectively arranged on each side of powder dispenser 15b in the X-direction.
  • each binding unit 15a, 15c includes an ink jet head arranged to jet binder into well 12 as print head 15 passes across well 12. By selectively jetting the binder as the print head 15 traverses well 12, portions of each layer of powder deposited by powder dispenser 15b can be selectively bound together, in order to form one layer of the object to be manufactured .
  • Print head 15 may additionally include one or more smoothing elements, such as a doctor blade or smoothing roller, arranged thereon and adapted to level the upper surface of the dispensed powder layer as print head 15 traverses well 12.
  • smoothing element could be arranged between powder dispenser 15b and binding unit 15c and/or between powder dispenser 15b and binding unit 15a.
  • print head 15 may include a curing unit, such as a UV lamp, associated with either or both binding units.
  • a curing unit may be provided on either side of the respective binding unit, such that the curing unit acts to cure either binder that has just been dispensed by the binding unit or binder of the previous layer to the layer onto which binder is being dispensed in the present printing pass .
  • Each binder unit 15a, 15c could, in one configuration, be provided as a scanning ink-jet head which is operable to deposit drops of binder at predetermined locations in a single row in the Y ⁇ direction before or while the print head advances in the X-direction so that the binder dispenser can selectively deposit binder at locations on each successive row.
  • each binder dispenser may comprise a single ink-jet head extending in the Y-direction the full extent of the well and having a plurality of binder dispensing orifices arranged in a row in at least the Y- direction such that, by activating individual orifices of the binder dispenser while the print head 15 translates across well 12 in the X-direction, binder may be deposited to selected locations in the X-Y plane of the well.
  • each binder dispenser may be arranged to translate in the Y- direction, but may also include plural orifices arranged in at least the Y-direction.
  • the orifices of the print head 15 may also be arranged in the X direction, for example as a tilted linear array, for example in order to achieve closer spacing in the Y-direction as between, the orifices.
  • the operation of the embodiment of Figure 1 will now be described.
  • the upper surface of platform 13 which, in the embodiment of Figure 1 is flat and parallel to the X-Y plane, has been retracted a short distance below the surface of table 11 to provide a build region (or build volume) into which a layer of powder may be dispensed.
  • the depth of the build region, and consequently the depth of the layer of powder to be dispensed above platform 13, may be selected such that the entirety of the depth of the layer may be selectively bound at a particular location through the action of the binding units, in order that one layer may be bound to a bound portion of the previous layer, without undesirably binding together substantial portions of the previous layer.
  • print head 15 traverses well 12 in the X-direction to deposit a layer of powder into the well on the surface of platform 13 from the dispensing orifice of the powder dispenser. Also, as the print head traverses in the X-direction, binder dispenser 15a selectively deposits binder onto portions of the deposited layer to selectively bind portions of that layer together.
  • the powder and binder are simultaneously dispensed in the same pass, the powder being dispensed to a location relatively advanced in the X- direction as compared with the location at which the binder dispenser is able to dispense binder, although other printing patterns are possible.
  • the powder can be deposited in a first pass in the X- direction, while the binder can be deposited in a reverse pass in the -X direction.
  • platform 13 is further lowered, for example by the intended thickness of the next layer, and print head 15, travelling in the reverse (-X) direction, deposits a further layer 2b on top of the first layer 2a as shown in Figure 3.
  • print head 15 travelling in the reverse (-X) direction
  • the embodiment of Figure 1 makes use of both a forward and a reverse pass for the depositing and binding of a layer. Accordingly, two layers can be deposited and bound within the time available for deposition of a single layer in known apparatus. Accordingly, printing with the disclosed embodiment can be significantly faster. In some configurations, binder may not be deposited at all on the first layer above table 13, in order to allow the printed object to be easily released from the upper surface of table 13.
  • FIG. 4 shows a schematic view of print head 15, showing clearly the twin binding units 15a and 15c as well as powder dispenser 15b.
  • Each binding unit 15a, 15c has an ink- jet head 15f , 15k providing a binder-dispensing orifice which is connected via a supply tube 15e, 15j to an external reservoir for binder .
  • the binder reservoir may be distinct for each binding unit, or may be a common reservoir shared between the binding units.
  • Print head 15 may be connected to the external reservoir, for example, by suitable length of flexible tubing.
  • powder dispenser 15b Positioned between binding unit 15a and binding unit 15c is powder dispenser 15b, which is connected via supply duct 15g to a powder reservoir.
  • Powder reservoir may be provided supported on print head 15 or may be external to print head 15 and the powder, which may be appropriately fluidised, may be delivered from the external reservoir to supply channel 15g.
  • Dispenser 15b also includes blade valve unit 15h, which functions to actuate the dispensing of the powder from the supply channel 15g through supply orifice 15i .
  • the supply of powder through orifice 15a may be selectively actuated by other means such as are known in the art .
  • Print head 15 may be driven along rail 16 in the Indirection by pairs of drive rollers 15d, which respectively in pairs clamp rail 16 between them, and which are, for example, electrically drivable to effect movement in the forward and reverse X-direction of print head 15.
  • the entirety of print head 15 is in the disclosed embodiment enclosed within external shell 151, such that binding units 15a and 15c and powder dispenser 15b share a common carriage.
  • print head 15 shown in Figure 4 is divided into three separate carriages, each being provided with its own drive means, the carriages respectively containing binding unit 15a, powder dispenser 15b, and binding unit 15c.
  • the driving of each of the separate carriages in the X-direction may be thereby be independently effected, and particularly may be effected at respectively different speeds .
  • printing apparatus 20 has three carriages 25a, 25b and 25c each arranged to translate along common rail 26 in the X-direction above well 22 formed in table 21 so as to deposit and bind layers of material arranged on movable support platform 23 , Whereas carriages 25a and 25c are provided respectively with binding units, carriage 25b is provided with a powder dispenser . From the configuration shown in Figure 5, carriages 25b and 25c traverse in the X-direction across well 22 such that a layer of powder is deposited from powder dispenser 25b, the stage shown in Figure 6. Carriages 25b and 25c may travel together at the same speed and in an adjacent formation, or binder unit 25c may depart earlier or may move faster than powder unit 25b, as may be desired. From the configuration shown in Figure 6, binding unit
  • binder unit 25a then travels in the X-direction across deposited powder layer 2a to selectively bind portions of layer 2a together.
  • binding unit 25a After binding unit 25a has completed its transit of well 22 , the configuration shown in Figure 7 is achieved, in which all carriages 25a, 25b and 25c are together arranged on one side of well 12.
  • it is not required to wait for powder dispenser 25b to arrive on the other side of well 22 before binder unit 25a begins its transit .
  • curing units or smoothing units can be provided also on independent carriages, or can be suitably arranged on one or more of the binder unit or powder dispenser carriages.
  • the print head may be configured to dispenser different binders or to use different binding methods for binder unit 25a and binder unit 25c.
  • the above disclosure has been made with regard to a print head which, reciprocates in at least a first linear direction above a well defining the printing region, the above disclostxre is also applicable to applications in which a print head is arranged to extend radially from the central axis of a build region and to sweep a circular pass around the axis to deposit powder into the circular build region and to selectively bind regions of the powder together.
  • the above disclosure has been exemplified with regard to situations in which two binding units are provided on either side of a powder dispenser in a reciprocating transit direction of the powder dispenser, the above disclosure can be equally implemented in a configuration in which two powder dispensers are arranged on either side of a single binder unit.
  • Such a configuration may be constructed as shown and described with, reference to Figure 1, except that elements 15a and 15c are to be considered as powder dispensers while element 15b is to be considered as a binding unit configured to, for example , to dispense a binder .
  • the powder dispensers could be configured to dispense either the same or different powders.
  • a ceramic powder and a metal powder could be used as the two different powders; or alternatively two different ceramics, two different metal powders, or two different powders of the same material but, for example, having different grain sizes. All the above disclosure may be equivalently implemented, therefore, in such a configuration.
  • the above disclosures are applicable to a wide variety of 3D printing technologies other than those specifically described, including the use of ceramic, polymer and metal powder construction materials, reactive, UV- curable, contact-curable or other jetted binders, or other binding techniques such as laser or thermal binding.
  • One particular embodiment uses a metal powder and a polymer binder.
  • a sintering process may be applied to the metal, powder after the object is removed from the printing apparatus .

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  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Robotics (AREA)

Abstract

L'invention concerne un appareil de fabrication d'additif. Cet appareil comprend une zone de construction. L'appareil comprend une unité de dépôt de matériau de construction disposée pour un mouvement de va-et-vient relatif dans au moins une première direction sur la zone de construction pour déposer un matériau de construction de façon incrémentielle, en couches, sur la zone de construction à partir d'une position de dépôt de matériau de construction sur l'unité de dépôt de matériau de construction. L'appareil selon l'invention comprend une première unité de liaison disposée pour un mouvement de va-et-vient relatif dans au moins la première direction sur la zone de construction pour lier le matériau de construction de façon sélective à certains emplacement sur les couches de matériau de construction déposé sur la première zone de construction à partir d'une première position de liaison sur la première unité de liaison. L'appareil selon l'invention comprend une deuxième unité de liaison disposée pour un mouvement de va-et-vient relatif dans au moins la première direction sur la zone de construction pour lier le matériau de construction de façon sélective à certains emplacements sur les couches de matériau de construction déposé sur la zone de construction à partir d'une deuxième position de liaison sur la deuxième unité de liaison. La première position de liaison, la position de dépôt de matériau de construction et la deuxième position de liaison sont placées dans cet ordre dans la première direction. La présente invention concerne également une configuration présentant deux positions de dépôt placées d'un côté et de l'autre d'une position de liaison, ainsi que des procédés de fabrication pouvant être mis en oeuvre au moyen dudit appareil.
PCT/EP2015/077099 2014-11-24 2015-11-19 Procédé et appareil de fabrication d'additif WO2016083234A1 (fr)

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GB1420886.2A GB2532518A (en) 2014-11-24 2014-11-24 Manufacturing method and manufacturing apparatus

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US20220016832A1 (en) * 2018-12-07 2022-01-20 Xaar 3D Limited Methods and apparatus for the manufacture of three-dimensional objects
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GB201420886D0 (en) 2015-01-07
GB2532518A (en) 2016-05-25

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