EP3046750A1

EP3046750A1 - Additive-manufacturing device for creating a three-dimensional object, and associated method

Info

Publication number: EP3046750A1
Application number: EP15701032.3A
Authority: EP
Inventors: Cédric MICHEL; Victor ROUX; Tom LEROUGE; David Hauser
Original assignee: Pollen Am
Current assignee: Pollen Am
Priority date: 2014-01-24
Filing date: 2015-01-26
Publication date: 2016-07-27
Also published as: KR20160113242A; CA2937266A1; AU2015208078A1; JP2017505727A; FR3016826A1; FR3016826B1; CN106414042A; IL246868A0; WO2015110625A1; US20170001370A1; RU2016134536A

Abstract

The main object of the invention is an additive-manufacturing device (1) for creating a three-dimensional object (2), characterized in that it comprises a materials selection unit (3), the materials including materials for the creation of the three-dimensional object (2), an induction heating unit (4) for heating the materials, the selection unit (3) being able to convey the materials toward the heating unit (4) which causes them to melt, and a materials deposition unit (5) which ejects the materials after they have passed through the heating unit (4) onto a support (6) so as to allow the three-dimensional object (2) to be built up in successive layers of material.

Description

ADDITIVE MANUFACTURING DEVICE FOR REALIZING AN OBJECT

THREE DIMENSIONAL AND ASSOCIATED METHOD

DESCRIPTION TECHNICAL FIELD

The present invention relates to the field of devices and methods for the manufacture of a three-dimensional object by selective deposition of material in successive layers. It thus particularly concerns, but not limited to, the field of three-dimensional printing, also called additive manufacture or rapid prototyping.

The invention has applications in different fields, both for industry and for a particular purpose. These areas include automotive, aerospace, medicine such as the dental industry, the military industry, consumer goods, jewelery, the film industry, visualization of projects for architecture or design studies, personal use of 3D printers, or online 3D printing services.

The invention thus proposes an additive manufacturing device for producing a three-dimensional object, a method for producing a three-dimensional object implemented by means of such a device, and a three-dimensional object obtained by this device or process.

STATE OF THE PRIOR ART

Three-dimensional printing, also known as 3D printing, is an additive manufacturing (or manufacturing) technique developed for rapid prototyping. This technique appeared in the mid-1980s, as a new method of manufacturing real objects from so-called CAD computer files for "Computer Aided Design". Thus, an operator draws the object on a computer screen using a CAD tool, in surface or volume mode. Then, the resulting 3D computer file is sent to a specific printer which slices it and deposits or solidifies the material layer by layer to obtain the object. final. In this way, three-dimensional printing makes it possible to obtain a real object, typically a prototype, by stacking layers of material, without machining. Stacking layers creates the volume of the object.

Since its emergence, three-dimensional printing has given rise to different coexisting technologies. We can cite, among others, stereolithography (or SLA for "StereoLithography Apparatus" in English), the extrusion of molten filament (or FDM for "Fused Deposition Modeling" in English), selective sintering by laser (or SLS for "Selective Laser Sintering"), electron beam fusion (EBM), 3DP printing (for "3D Printing" in English) or 3D printing by PolyJet.

In recent years, we can observe a phenomenon of democratization of these technologies, for individuals. This phenomenon is mainly based on SLA and FDM type processes, simplifying and miniaturizing them. However, this poses a problem of use because these processes have been developed in order to make prototypes and not finished objects, suitable for consumption, without having to request a post-processing.

Moreover, these two processes of the SLA and FDM type are limited in terms of the versatility of the materials used. Indeed, the FDM type process essentially uses polymers of the ABS type (for "acrylonitrile butadiene styrene") or PLA (for "polylactide"), and the SLA type process mainly uses aqueous solutions of resins. Some devices using these methods then partially meet this problem of versatility of materials, adding as many print heads as materials supported, which increases their complexity. In addition, such devices offer only slight variations in materials, and in no way heterogeneous materials. However, obtaining a consumption model from an additive manufacturing device requires the support of a plurality of materials (for example polyamides, ceramics, metals, among others), which poses the problem of the adhesion of the different materials used and their structural integrity. Moreover, these two processes of the SLA and FDM type are also limited in terms of reliability. Indeed, whether it is for the measurement of the temperature, its control or its diffusion, the two processes require numerous and expensive components to gain precision. In particular, the thermal resistances of the FDM type process imply a relative service life and maintenance of the heavy device for individuals. The same goes for the SLA type process with the use of laser (s) or radiative source (s) light (s). More generally, the control of the position of the print head, critical both for the accuracy and for the good realization of a three-dimensional model, requires for these two processes a considerable number of additional sensors, which add complexity and cost. . However, to achieve a versatile and reliable system, and especially for individuals, it is necessary to control these elements.

In addition, all existing technologies, with the exception of 3DP printing, which uses a chemical binder to solidify the material in the powder state, incur considerable energy consumption: thermal resistors, lasers and the like are not optimized for versatile consumer use in terms of materials.

Finally, all existing technologies require post-treatment, both to "clean" the object at the end of the device to perfect it by giving it more strength, to polish, coat or colorize.

All these limitations and constraints are regrettable as harmful to the user experience, both in the feasibility and in the result, while it is one of the main challenges to develop the use and consumption of such technology .

DISCLOSURE OF THE INVENTION There is thus a need to propose a new principle of additive manufacture having, among other things, a capacity for treating heterogeneous materials in the same process, a finishing capacity of the final object by a coating, colorized or no, always during this same process, and taking into account energy and chemical constraints inherent to a problem of mass consumption.

The object of the invention is to remedy at least partially the needs mentioned above and the drawbacks relating to the embodiments of the prior art.

The invention thus has, according to one of its aspects, an additive manufacturing device for producing a three-dimensional object, characterized in that it comprises:

a material selection unit, including materials for producing the three-dimensional object,

an induction heating unit for the materials, the selection unit being able to convey the materials to the heating unit which brings them into fusion,

- A material deposition unit, which ejects the materials after passing through the heating unit on a support, to allow the realization of the three-dimensional object by successive layers of material.

Thanks to the invention, it may be possible to reduce or solve all the disadvantages and problems mentioned above in connection with the embodiments according to the prior art. In particular, it may be possible to manufacture an object in three dimensions, and more specifically to autonomously make a complete object, which may comprise a plurality of materials, colorized or not, optionally provided with one or more coatings, without having to require a possible subsequent treatment of the object. In addition, through the use of induction heating, significant energy savings can be achieved compared to other additive manufacturing technologies using an energy source to process the materials. The induction can also make it possible to obtain a targeting of the zone to be treated because the energy is converted into heat over a specific zone with a very weak diffusion. In addition, the same induction heating process can be used for different materials, which receive a specific treatment according to their composition.

The device according to the invention may further comprise one or more of the following characteristics taken separately or in any possible technical combination. The material selection unit may comprise a first material conditioning part in capsules and a second material distribution part, in particular to the induction heating unit.

The capsules can be interchangeable. The packaged materials can be in different forms, especially in liquid or solid form, and more particularly in the form of fine powder.

The first material conditioning part may comprise first material capsules for producing the three-dimensional object, and / or second material capsules for producing and / or treating the support, and / or third material capsules. of colorization for the support and / or the three-dimensional object.

The second material distribution section may comprise a first material distributor for producing the three-dimensional object, and / or a second material distributor for producing and / or treating the support, and / or a third material dispenser. of colorization for the support and / or the three-dimensional object.

The material selection unit may comprise various elements useful for the packaging and distribution of materials, such as, for example, piezoelectric valves, moisture measuring sensors, material identification elements, and indication elements. age of materials, among others.

The induction heating unit of the materials may comprise a first inductive heating portion of the materials for producing the three-dimensional object and a second induction heating portion of the materials for producing and / or processing the support.

The induction heating unit, and in particular the first induction heating part and / or the second induction heating part, may comprise at least one induction heating module, comprising:

an insulating tubular element, in particular thermally and / or electrically insulating, a rod, in particular a rotary rod, and in particular a helical rod, situated inside the tubular element,

at least one induction coil portion extending on the outer wall of the tubular element,

the materials being able to penetrate inside the tubular element to be melted by induction heating in contact with the rod.

The tubular element may have an inner wall treated to reduce its viscosity, comprising for example a coating of polytetrafluoroethylene (PTFE) or an equivalent.

The rod may preferentially be rotatable. However, the rod can also alternatively be fixed.

In the case of a rotary helical rod, the shape of the blades of the helical rod can be variable, and the pitch can be variable.

The rod may comprise a material that strongly reacts to magnetic fields generated by induction.

The induction heating unit may also comprise a variable speed motor connected to the rod, in particular in the case of a rotary rod to allow its rotation, for example by means of a belt or any other drive system. The induction heating unit may also include one or more induction generators. The induction heating unit may further comprise a compartment or storage lock of molten materials for ejection or deposition.

The induction heating unit may comprise a plurality of induction heating modules, at least two of the induction heating modules for induction heating of materials of different compositions.

The material deposition unit may comprise a first deposition portion of the materials for producing the three-dimensional object and a second deposition portion of the materials for producing and / or processing the support.

The material deposition unit, in particular the first deposition part and / or the second deposition part, may comprise at least one deposition module by acoustic wave generation. As a variant, the material deposition unit may comprise a deposition module by other types of material ejection means, for example by pneumatic actuation, by the pressure generation resulting from the actuation of the cell (s). ) piezoelectric (s), or by thermal excitation.

Thanks to the presence of at least one deposition module by acoustic wave generation, it may be possible to switch from a mode of ejection of the material point by point (in the form of droplets) to a flow continuous ejection, and vice versa, as specified later. In addition, it may be possible to adapt the volume of material to be deposited on the support by controlling the frequency and amplitude of the acoustic wave. In addition, it may be possible to interact without contact with the different materials used to make the three-dimensional object and / or the support. Finally, it may be possible to determine on the fly the position of the print head of the device, including the induction heating unit and the deposition unit, relative to the support.

Advantageously, the material deposition unit comprises a plurality of deposition modules by generating acoustic waves. These deposition modules by generating acoustic waves can be flexible.

The acoustic wave generation deposition module (s) may be located in the melting chamber or storage chamber of the induction heating unit.

The acoustic wave generation deposition module or modules may comprise piezoelectric transducers, possibly associated with Fresnel multifocal zones depending on the viscosity of the molten materials in fluidic form to be treated.

Piezoelectric transducers can act as both variable acoustic transmitters and acoustic receivers.

The material deposition unit may comprise at least one extrusion orifice, in particular as many extrusion or deposition ports by acoustic wave generation, through which the molten material pushed under the ejection influence of said at least one deposition module by generating acoustic waves. The size of the at least one extrusion orifice may be smaller than the flow capacity of the melt materials in fluid form.

Said at least one deposition module by generating acoustic waves may be able to allow the deposition of material continuously or by droplets.

The acoustic wave generation deposition module or modules, associated with one or more molten material extrusion orifices, can operate in the following manner: a signal received by a deposition module by wave generation acoustic generates an acoustic wave which develops a pressure on the melt, forcing it to pass through an extrusion orifice relative to this deposition module by generating acoustic waves.

The signal received by the deposition module by acoustic wave generation can be sent by a computer control system (or electronic control) of the additive manufacturing device according to the invention. The control by this computer control system of signals sent to the deposition modules by acoustic wave generation can make it possible to select one or more extrusion orifices, and thus to control the flow and the volume of melt ejected.

The device may further comprise elements for controlling the flow and / or the temperature of the materials, especially in the form of AC current sources.

The device may further comprise a computer control system for communicating with a CAD tool and controlling the operation of the device.

According to another of its aspects, the subject of the invention is also a method for producing a three-dimensional object by additive manufacture, characterized in that it is implemented by means of a device as defined above, and in that it comprises in particular one or more of the following steps:

selective routing of materials from the selection unit to the heating unit, in particular by means of at least one material dispenser,

- selective heating of materials by the heating unit to the melting of materials, use of at least one rod, in particular of at least one rotary rod, and in particular helical rod, for induction heating and control of the flow of materials,

deposition in the form of droplets or continuously of the molten material by the deposition unit on the support,

cooling of the deposited material,

moving the support relative to the deposition unit to allow the deposition of successive layers of material,

- Realization of a multi-material three-dimensional object by using capsules of different materials, heated at different temperatures by the heating unit,

- Treatment of the support through the deposition unit of materials to confer coating properties, including adhesion and / or colorization.

The invention also relates, in another of its aspects, to a three-dimensional object of additive manufacture, characterized in that it is obtained by a device as defined above or a method as defined above.

In addition, the invention also relates, in another of its aspects, to an additive manufacturing device for producing a three-dimensional object, characterized in that it comprises:

a material heating unit, the selection unit being able to convey the materials to the heating unit,

a material deposition unit comprising at least one deposition module by acoustic wave generation, which ejects the materials after passing through the heating unit on a support, to enable the realization of the three-dimensional object by layers of material successive.

The characteristics previously stated for the additive manufacturing device, the method and the three-dimensional object according to the invention can be taken singly or in any technically possible combination with other characteristics.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be better understood on reading the following detailed description of an example of non-limiting implementation thereof, as well as on examining the schematic and partial figures of the appended drawing. , on which :

FIG. 1 illustrates, in block diagram form, an example of an installation comprising an additive manufacturing device according to the invention,

FIG. 2 represents in more detail the material selection unit of the additive manufacturing device of FIG. 1,

FIG. 3 is another detailed representation of the material selection unit and the print head, comprising the heating unit and the deposit unit, of the additive manufacturing device of FIG. 1,

FIG. 4 represents, in section, an example of a heating unit of an additive manufacturing device according to the invention similar to that of FIG. 1,

FIG. 5 represents, in top view, the heating unit of FIG. 4 and the deposition unit of the additive manufacturing device according to the invention, and

FIG. 6 represents, in partial section and in perspective, an example of induction heating module of the heating unit of FIG. 4.

In all of these figures, identical references may designate identical or similar elements.

In addition, the different parts shown in the figures are not necessarily in a uniform scale, to make the figures more readable.

DETAILED DESCRIPTION OF A PARTICULAR EMBODIMENT FIG. 1 illustrates, in the form of a block diagram, an example of an installation comprising an additive manufacturing device 1 according to the invention.

The installation is for example in the form of a housing B, which comprises in particular the device 1 of additive manufacture according to the invention, a support 6 on which a three-dimensional object 2 is intended to be manufactured and a computer control system 18 for communication with a CAD tool 19 and control of the operation of the device 1.

The CAD tool 19 can be used to design by computer a cutting plane of a three-dimensional model, which can take into account a variety of materials, which can subsequently be realized by means of the device and the method according to the invention. 'invention.

According to the invention, the additive manufacturing device 1 comprises a selection unit 3 of materials, including materials for producing the three-dimensional object 2, an induction heating unit 4 of the materials, the selection unit 3 being able to convey the materials to the heating unit 4 which brings them in fusion, and a material deposition unit 5, which ejects the materials after passing through the heating unit 4 on the support 6, to allow the realization of the three-dimensional object 2 by depositing successive layers of material.

More specifically, the material selection unit 3 comprises a first material conditioning portion 3a and a second material distribution part 3b, in particular to the induction heating unit 4. Thus, the selection unit 3 of the materials may allow the selection of the material or materials required to make the three-dimensional object 2 and / or modify the support 6, and route them to the induction heating unit 4.

Furthermore, the induction heating unit 4 and the deposition unit 5 of the materials are contained in a printing head P of the device 1 according to the invention, which is able to move horizontally along the arrows Fl along of the horizontal axis X, to eject the molten material from the induction heating unit 4 on the support 6 in the desired locations.

In addition, the support 6, on which is positioned the three-dimensional object 2 to manufacture, is also able to move vertically along the arrows F2, along the vertical axis Z, to be able to adjust its distance vis-à-vis of the printing head P during the deposition of the successive layers of material. The computer control system 18 is connected to the various elements and units of the device 1 according to the invention, which can enable control and communication between these elements, and in particular to ensure the manufacture of the three-dimensional object 2 and the possible finish of the support 6.

Thus, the computer control system 18 may for example comprise a computer 20, associated with a processing software 21 and an internal memory 22, as well as a communication device 23 connected to the external CAD tool 19 allowing the transfer of data. a computer file associated with the three-dimensional object 2 to be produced. In addition, an energy source 24 can be integrated into this computer control system 18.

FIG. 2 shows in greater detail the material selection unit 3 of the additive manufacturing device of FIG. 1.

As indicated above, the material selection unit 3 comprises a first material conditioning portion 3a and a second material distribution part 3b. The first material conditioning portion 3a comprises capsules 3a, 3a ₂ and 3a3 of materials and the second distribution portion 3b comprises distributors 3bi, 3b ₂ and 3b3 of materials. More specifically, the first material conditioning portion 3a comprises first capsules 3a1 of materials for producing the three-dimensional object 2, second capsules 3a ₂ of materials which allow the realization and / or the possible treatment or finishing of the support 6 and third capsules 3a3 of materials that can allow the colorization of the support 6 and / or the three-dimensional object 2.

According to the needs for the realization of the three-dimensional object 2 and the possible finish of the support 6, these material capsules are fed to the material distributor of the second distribution part 3b. This second material distribution part 3b thus comprises a first distributor 3bi of materials for producing the three-dimensional object 2, a second distributor 3b ₂ of materials for producing and / or processing the support 6, and a third distributor 3b3 of materials to allow the possible colorization of the support 6 and / or the three-dimensional object 2. Each of the first 3bi, second 3b ₂ and third 3b3 material distributors have different elements allowing them to carry the delivery of the material capsules from the selection unit 3 to the induction heating unit 4, these elements comprising in particular valves 7, flow control elements 8 and conveying conduits 9, in particular flexible.

FIG. 3, which is another detailed representation of the material selection unit 3 and of the print head P, which comprises the induction heating unit 4 and the deposition unit 5 of the device, will now be described. of additive manufacture 1 of Figure 1.

As can be seen in this FIG. 3, the induction heating unit 4 of the materials comprises a first induction heating portion 4a of materials for producing the three-dimensional object 2 and a second induction heating portion 4b of the materials for producing and / or processing the support 6.

More particularly, the first material distributor 3bi of the selection unit 3 is connected to the first induction heating part 4a of the induction heating unit 4, and the second material distributor 3b ₂ of the induction unit 4 selection 3 is connected to the second induction heating part 4b of the induction heating unit 4.

Each of the first part 4a and second part 4b of induction heating further comprises control elements for bringing the molten material and control the proper operation of the induction heating. These control elements comprise, for example, a temperature control element 14 and a material flow control element 15.

Furthermore, each of the first part 4a and the second induction heating part 4b comprises at least one induction heating module 10, as will be described hereinafter with reference to FIGS. 4 to 6.

Furthermore, FIG. 3 also shows in more detail the deposition unit 5 of the materials, which allows the ejection of the molten materials after passing through the heating unit 4 on the support 6. Advantageously, the material deposition unit 5 allows the ejection of the melt through the generation of acoustic waves. More specifically, the deposition unit 5 of the materials comprises a first deposition portion 5a of the materials for producing the three-dimensional object 2 and a second deposition portion 5b of the materials for producing and / or processing the support 6.

Each of the first part 5a and second part 5b of deposition of the materials comprises at least one deposition module by acoustic wave generation 17, which can be connected together, as shown. The operation of these deposition modules by generating acoustic waves 17 will be described later.

Moreover, each of the first deposition part 5a and the second deposition part 5b of the materials may comprise a plurality of elements necessary for the proper operation of the ejection of the molten material on the support 6, and for example control elements such as material flow control elements 15, similar to those described for the induction heating unit 4. In addition, ejection chambers 24 and melt deposition aid elements 25 may be present.

Moreover, the invention proposes to carry out the possible treatment of the support 6 in order to obtain, if necessary, a finished three-dimensional object 2, that is to say usable without requiring a post-processing, the realization and / or the modification of the support 6 can be made through the second distributor 3b ₂ of material capsules, connected to the second heating portion 4b itself connected to the second deposition portion 5b. In addition to this process, the third distributor 3b3 of the third capsules 3a3 of materials can be connected directly to a selective injection device of colorization materials 26, integrated with the print head P and directly connected to the second deposit part 5b of the deposition unit 5, and more particularly to an ejection chamber 24 of this second deposition portion 5b. In the implementation of the colorization of the support 6, various solutions can be envisaged such as the use of selective heat, radiation, or a reactive agent in colorized solutions. The induction heating unit 4 and the deposition unit 5 of the additive manufacturing device 1 according to the invention will now be described in more detail with reference to FIGS. 4 to 6.

More specifically, Figure 4 shows, in section, an example of an induction heating unit 4 of the additive manufacturing device 1 according to the invention. FIG. 5 represents, in plan view, the induction heating unit 4 of FIG. 4 and the deposition unit 5 of the additive manufacturing device 1 according to the invention, and FIG. 6 represents, in partial section and in perspective, an example of induction heating module 10 of the heating unit 4 of FIG. 4.

As can be seen by comparison of Figures 4, 5 and 6, the induction heating unit 4 may comprise for example six induction heating modules 10a-10f. Of course, the number of induction heating modules of the heating unit 4 is in no way limiting, and can be determined according to the needs for the realization of the three-dimensional object 3 and / or the realization or modification of the support 6. Similarly, the additive manufacturing device 1 according to the invention may alternatively comprise a plurality of induction heating units 4 associated with a plurality of melt deposition units 5.

Each induction heating module 10a-10f has a tubular element 11, thermally and / or electrically insulating, into which the material to be treated is introduced, for example in the form of powder, liquid or solid. This tubular element 11 advantageously has an internal wall treated to reduce the viscosity, which may in particular be made with PTFE.

In addition, each induction heating module 10a-10f comprises a rotary rod 12, in particular in helical form, which is located inside the tubular element 11. The helical rod 12 may have blades of variable shape and be composed of a material that strongly reacts to magnetic fields generated by induction. This helical rod 12 serves as a means for driving the materials introduced into the tubular element 11 towards a storage compartment or lock the molten material, heated in contact with the helical rod 12. In addition, each induction heating module 10a-10f comprises at least one induction coil portion 13 which extends on the outer wall 11a of the tubular element 11.

More precisely, as can be seen in FIG. 5, the same induction coil 13 can extend all around the six induction heating modules 10a-10f, and in particular on the outer wall 11a of the tubular elements 11. a plurality of induction coils 13 may be superimposed on each other along induction heating modules 10a-10f, as shown in FIGS. 4 and 6.

On the other hand, the induction heating unit 4 may also comprise one or more variable speed motors connected to the helical rod (s) 12 by means of a belt or any other system of drive to allow the rotation of the rods 12, and also one or more induction generator (s), not shown.

Advantageously, the use of a plurality of induction heating modules 10a-10f, thus comprising a plurality of helical rods 12, all subject to the same induction process, can make it possible to use a composition of different materials in each induction heating module 10a-10f which, subjected to magnetic fields generated by induction, makes it possible to arrive at different temperatures, depending on the materials present in the tubular elements 11.

Moreover, FIG. 5 represents the deposition unit 5, positioned for example in the lock chamber 30 of the heating unit 4. As can be seen in this FIG. 5, the deposition unit 5 can comprise a plurality of acoustic wave generation deposition modules 17, associated with a plurality of extrusion orifices 16, through which the pushed melt is ejected under the influence of the acoustic waves generated by the deposition modules 17.

The extrusion orifices 16 may advantageously have a size smaller than the flow capacity of the molten materials in fluidic form. The acoustic wave generation deposition modules 17 may in particular comprise piezoelectric transducers, possibly associated with multifocal zones of Fresnel depending on the viscosity of the molten fluid to be treated, and can act as both variable acoustic transmitters and acoustic receivers.

To allow the ejection of the molten material by the deposition unit 5 onto the support 6, the operation of the acoustic wave deposition is as follows: a signal, for example emitted by the computer control system 18, received by one of the acoustic wave generation deposition modules 17 generates an acoustic wave which develops a pressure on the molten material, thus forcing it to pass through an extrusion orifice 16 associated with this deposition module by generating acoustic waves 17.

The computer control, and in particular by means of the computer control system 18 of the various signals sent to the various deposition modules by acoustic wave generation 17, can make it possible to select one or more extrusion orifices 16 as required, and control the flow and volume of ejected materials.

Furthermore, the use of piezoelectric transducers in the acoustic wave generation deposition modules 17 can make it possible to know and control in real time the vertical position of the print head P along the vertical axis Z as shown in FIG.

In addition, the selective deposition of the melt by means of acoustic waves of the deposition unit 5 may make it possible to envisage a point-to-point deposition, in the form of droplets, or as a continuous flow of the material on the support 6, the transition from one to the other of these two flow modes being simplified.

The additive manufacturing device 1 according to the invention, as described above, can make it possible to obtain the desired three-dimensional object 2 according to the data of the CAD tool 19.

Advantageously, the invention can thus make it possible to avoid resorting to a post-processing of the three-dimensional finished object 2. It allows the simplified realization of a multi-material finished object and makes it possible to obtain autonomous finishes.

Of course, the invention is not limited to the embodiment which has just been described. Various modifications may be made by the skilled person. The expression "having one" shall be understood as being synonymous with "having at least one", unless the opposite is specified.

Claims

1. Device (1) of additive manufacture for producing a three-dimensional object (2), characterized in that it comprises:

a selection unit (3) for materials, including materials for producing the three-dimensional object (2),

an induction heating unit (4) for the materials, the selection unit (3) being able to convey the materials to the heating unit (4) which brings them into fusion,

- A material deposition unit (5), which ejects the materials after passing through the heating unit (4) on a support (6), to allow the realization of the three-dimensional object (2) by successive layers of material said material deposition unit (5) comprising at least one acoustic wave generation deposition module (17).

2. Device according to claim 1, characterized in that the selection unit (3) of materials comprises a first portion (3a) of packaging materials in capsules (3ai, 3a ₂ , 3a3) and a second part (3b ) of distribution of materials, in particular to the induction heating unit (4).

3. Device according to claim 2, characterized in that the second part (3b) of material distribution comprises a first distributor (3bi) of materials for producing the three-dimensional object (2), and / or a second distributor ( 3b ₂ ) of materials for the production and / or treatment of the support (6), and / or a third distributor (3b3) of colorization materials for the support (6) and / or the three-dimensional object (2).

4. Device according to any one of the preceding claims, characterized in that the induction heating unit (4) of the materials comprises a first induction heating part (4a) of the materials for the realization of the three-dimensional object (2) and a second induction heating part (4b) of the materials for producing and / or processing the support (6).

5. Device according to any one of the preceding claims, characterized in that the induction heating unit (4), and in particular the first induction heating part (4a) and / or the second induction heating part ( 4b), comprises at least one induction heating module (10; 10a-10f), comprising:

an insulating tubular element (11), in particular thermally and / or electrically,

- a rod (12), in particular a rotating rod (12), and in particular helical, located inside the tubular element (11),

at least one induction coil portion (13) extending on the outer wall (11a) of the tubular element (11),

the materials being able to penetrate inside the tubular element (11) to be melted by induction heating in contact with the rod (12).

Device according to claim 5, characterized in that the induction heating unit (4) comprises a plurality of induction heating modules (10a-10f), at least two of the induction heating modules (10a-10f). ) for induction heating of materials of different compositions.

7. Device according to any one of the preceding claims, characterized in that the deposition unit (5) of the materials comprises a first deposition portion (5a) of the materials for producing the three-dimensional object (2) and a second deposition part (5b) of the materials for producing and / or treating the support (6).

8. Device according to claim 7, characterized in that the first deposition portion (5a) and / or the second deposition portion (5b) comprises at least one deposition module by acoustic wave generation (17).

9. Device according to any one of the preceding claims, characterized in that the deposition unit (5) of the materials comprises at least one extrusion orifice (16), including as many extrusion orifices (16) as deposition modules by acoustic wave generation (17), through which is ejected the molten material pushed under the influence of said at least one deposition module by generating acoustic waves (17).

10. Device according to any one of the preceding claims, characterized in that said at least one acoustic wave generation deposition module (17) is adapted to allow the deposition of material continuously or by droplets.

11. A method of producing a three-dimensional object by additive manufacture, characterized in that it is implemented by means of a device (1) according to any one of the preceding claims, and in that it comprises in particular one or more of the following steps:

- Selective routing of materials from the selection unit (3) to the heating unit (4), in particular through at least one material dispenser

selective heating of materials by the heating unit (4) until the melting of the materials,

- Use of at least one rod (12), in particular at least one rotary rod (12), and in particular helical, for induction heating and control of the flow of materials,

- deposit in the form of droplets or continuously molten material by the deposition unit (5) on the support (6), cooling of the deposited material,

- moving the support (6) relative to the deposition unit (5) to allow the deposition of successive layers of material,

- Making a multi-material three-dimensional object (2) by using capsules (3ai, 3a ₂ , 3a3) of different materials, heated at different temperatures by the heating unit (4),

- Treatment of the support (6) through the deposition unit (5) of materials to confer coating properties, including adhesion and / or colorization.