• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method of manufacturing at least a portion of a workpiece by successive layer deposition, comprising the steps of: a) depositing a first layer (110) of a molten metal on a substrate (80) to form a first metal bead on the substrate, b) depositing a second layer of molten metal on said first bead, thereby forming a second bead on said first bead, and c) repeating steps a) and b) for each new metal layer to be deposited above a previous bead, until the formation of said at least part of the part, characterized in that it comprises, after n deposition steps, n being greater than or equal to at 1, a step of compressing the formed bead.
    公开号:FR3047914A1
    申请号:FR1651359
    申请日:2016-02-19
    公开日:2017-08-25
    发明作者:Daniel Cornu；Jawad Badreddine；Vincent Dessoly
    申请人:Safran SA；
    IPC主号:
    专利说明:

    Method and device for manufacturing a part by successive layers deposition
    TECHNICAL FIELD The invention relates to a method and a device for manufacturing a part by additive manufacturing by successive layer deposition.
    STATE OF THE ART The state of the art includes documents FR-A1-2 816 836 and FR-A1-2 998 496.
    There are at least two types of additive manufacturing of a part: either the part is made by successive deposits of melt (Figure 1), or the piece is made by selective melting of powder beds.
    The device of FIG. 1 makes it possible to manufacture a part by successive deposits of layers or melt. The part is made by superposing layers 10 on a substrate 80. The device comprises a laser head 20 whose beam 22 melts the material, such as a metal alloy.
    This additive manufacturing technique is known by different names, most of which are trademarks of different device manufacturers or research institutions: laser deposition [Laser Metal Deposition (LMD)], direct metal deposition [Direct Metal Deposition ( DMD)], Direct Laser Deposition (DLD), Laser Engineered Net Shaping (LENS), laser cladding, laser powder fusion welding.
    The laser beam 22 serves to form a melt on the substrate 80, on which a powder 24 is deposited, for example by means of the laser head 20, as shown in the drawing. The powder melts, forming a layer or bead melt adhering to the substrate. Then several layers or cords are superimposed on the first cord to make the piece. The laser head 20 is usually controlled using a robot.
    A wide range of alloys of titanium, nickel, cobalt, WC (tungsten carbide) and steel can be used, including T-AI6-4V, Inconel-718, Rene-142 and Stellite-6.
    Typical laser sources are CO2, Yb fibers and Nd-YAG disc.
    This technique is for example used in the aeronautical field to manufacture parts of an aircraft turbomachine.
    During the additive manufacturing of a part by the aforementioned technique, one can observe a deformation of the massive zones related to the increase of the residual stresses. The rapid solidification cord by cord or layer by layer entails several drawbacks: risk of oxidation between the layers which can lead to bad metallurgical health (degraded mechanical characteristics and bad cohesion between layer), deformation of the cord if the stresses are important, resulting an offset of the upper layers, etc. In addition, the directional thermal transfer to the construction substrate induces a columnar growth of the grains, the final material being anisotropic. Indeed, it is necessary to control as much as possible the generation of the residual stresses and the anisotropy of the microstructure to arrive at producing healthy parts.
    The present invention provides a solution to these problems which is simple, effective and economical.
    SUMMARY OF THE INVENTION The invention thus proposes a method of manufacturing at least part of a part by successive layer deposition, comprising the steps of: a) depositing a first layer of a molten metal on a substrate to form a first metal bead on the substrate, b) depositing a second layer of molten metal on said first bead so as to form a second bead on said first bead, and c) repeating the steps a) and b) for each new metal layer to be deposited above a previous bead, until the formation of said at least part of the part, characterized in that it comprises, after n stage (s) deposition, n being greater than or equal to 1, a step of compressing the formed bead. When n is equal to 1, a compression step is provided after each deposition step. The invention thus proposes to improve the properties of the cords by treating them just after their formation and therefore before it is covered by a new bead. The cord-by-layer or layer-by-layer compression treatment makes it possible to modify / eliminate stresses applied to the strands, hardening of their material or even stripping of the oxides, which make it possible to treat the deformation, structural anisotropy and of link faults. By surface hardening, the structure is regenerated to prevent growth by epitaxy. Shot peening can also be used to remove the oxide layer before deposition of the next layer, improve adhesion or modify the microstructure of the shot-blasted layer.
    For this, the invention proposes to combine two very different processes namely additive manufacturing by successive layer deposition and compression setting for example by shot blasting. Both processes can use materials in the form of powder or particles, which may be the same to not pollute the part being formed.
    The method according to the invention may comprise one or more of the following steps or characteristics, taken separately from each other or in combination with each other: the compression is carried out hot, that is to say before complete cooling of said bead, the step of compression is performed when the material of said bead is at a temperature greater than 30 ° C, preferably greater than 100 ° C, more preferably greater than 200 ° C, and for example approximately 300 ° C, the step of placing in compression is carried out by projection of a flow of compression air on said bead, the step of compression is carried out by shot blasting said bead, shotblasting is made with particles of a material identical to the material of a powder used for making the beads, said particles preferably having a size different from the particle size of said powder, - the shot blasting is made with particles of a material different from the material used for the manufacture of the cords, - the compression step is configured to allow: i) introduction of residual compression stresses for counteract the residual tensile stresses produced by the melting to minimize deformations, and / or ii) stripping of any oxide layer that would develop on the surface of the strand, and / or iii) a modification of the microstructure initial bead (anisotropic or columnar) by shot blasting to obtain a homogeneous microstructure (multidirectional or reduction of grain sizes). The invention also relates to a device for implementing the method as described above, characterized in that it comprises: a laser head for melting a filler metal in order to form a bead; and a nozzle for compressing said bead.
    Advantageously, the laser head and the nozzle are carried by a common robotic arm.
    BRIEF DESCRIPTION OF THE FIGURES The invention will be better understood and other details, characteristics and advantages of the present invention will appear more clearly on reading the description which follows, given by way of nonlimiting example and with reference to the appended drawings. in which: - Figure 1 is a schematic perspective view of a device for manufacturing a piece by additive manufacturing according to the prior art; FIG. 2 is a very schematic representation illustrating the general principle of the invention; FIG. 3 is a very schematic view of an embodiment of the device according to the invention, and FIG. 4 is a very schematic view. of an alternative embodiment of the device according to the invention.
    DETAILED DESCRIPTION
    Additive manufacturing has many advantages including a reduction in manufacturing time, costs and fixed costs, compared to a molded part, injected or machined in the mass.
    Parts developed by additive manufacturing however have drawbacks: on solidification, residual tensile stresses appear at each layer, which can lead to cracking. The invention makes it possible to overcome these drawbacks by means of a manufacturing device represented in FIG. 2, which comprises: a first powder deposition nozzle 100 on the substrate 80, a laser beam emission head 104 106, and a second nozzle 108 for the compression of the cord 110 after its formation and before being covered by a new cord.
    As in the case represented in FIG. 1, the function of the nozzle 100 could be integrated into the laser head 104. It would then have a laser head 104 capable of depositing powder 102 on the substrate 80, and the nozzle 108.
    The method according to the invention comprises, after each step of forming a layer or a cord, a step of compressing the cord 110.
    Preferably, the compression of the cord 110 is carried out by shot blasting or gas cooling of the bead, after the passage of the beam 106 on the layer to treat layer by layer or bead cord, and apply compressive stresses, or achieve a desired microstructure. Shot peening or cooling has different effects depending on the temperature of the substrate, the positioning of the emission head 104 of the beam 106, etc. This temperature can for example be managed by identifying the surface isotherms of each bead 110.
    In a particular case where the bead compression is performed when the bead is at ambient temperature, the distance L of work between the layer and the head 104 may be of the order of about 150 mm. This head 104 may have a diameter of 6 mm and particles with a diameter of about 100 μm may be deposited at a pressure of 0.2-0.8 MPa to effect shot blasting.
    In a particular case where the compression is performed when the bead is at a high temperature (for example of the order of 300 ° C.), the shot peening can be carried out at a pressure of 0.6 MPa with balls of 1, 0 mm. This shot peening can be followed by a microshotpeening treatment, which is carried out at a pressure of 0.6 MPa with 0.1 mm balls. The application of the invention to a steel cord of high hardness (600 - 1000 HV) makes it possible to reach a surface stress of the order of -350 to -500 MPa, a maximum compression stress of the order of -400 to -2000 MPa, a maximum stress depth of the order of 5 to 20 pm, and a compression depth of between 50 and 100 pm.
    To carry out shot blasting, a controlled microgranage nozzle can be used which uses fine powder from 10 to 100 μm. The impact surface can be a few square millimeters and the affected depth between 50 and 150pm.
    This is compatible with laser direct deposition methods. Indeed, the merged layers have a thickness of the order of 200 to 500pm in direct laser deposition. The fused powders are of the same particle size; we can consider using the same powders to not pollute the parts. Shot blasting works in the same order of magnitude as the aforementioned additive manufacturing process.
    For the constrained aspects, it is possible to modulate modifications of constraints in depth. It is also possible to benefit from the cooling effect of the carrier gas in order to modify the stresses and to limit the oxidation.
    As mentioned above, the compression can also be introduced using a carrier gas, without the use of media such as micro-shot blasting, in order to quench the cord of material and introduce constraints therein. residual. The expelled gas may be neutral or reactive gas. It preferably has a flow rate capable of accelerating the cooling of the cord more rapidly than by conduction via the support.
    The micro-shot blasting or ejection nozzle 108 of the gas flow must follow the head 104 by impacting the solidified bead with a certain delay to be determined depending for example on the distance d between the nozzle and the head, d may depend on the cooling temperature of the cord and the temperature conducive to compressing the cord. In fact, it is preferable to control the orientation of the shot peening nozzle differentiated from that of the spray nozzle.
    The emission head 104 and the second nozzle 108, or even the first nozzle 100, are preferably carried by a common robotic arm.
    Figures 3 and 4 show two embodiments of the device according to the invention. In Figure 3, the arm 120 is rotatable about an axis 122, for example vertical. The head 104 is centered on the axis 122 and micro-shot blast nozzle outlets are located on a circumference centered on the axis 122. The arm is moved in a plane containing the axis 122, such as the plane of the drawing , and the nozzle 108 located downstream of the beam 106, relative to the direction of movement of the arm, is used to compress the cord.
    In the case of Figure 4, the arm 120 carries the shot blasting nozzle 108 and the beam emission head 104, the distance between the two being modifiable by translation of the nozzle vis-à-vis the arm. The arm is movable in translation as well as in rotation about the axis 122 of the head 104.
    If the shot peening particles are of the same nature as those of the powder, there is a risk of greater loss of powder. One solution is to use a powder with a larger particle size so as to recover by sieving, or a powder of a different material, such as ceramic, recovered by magnetic separation.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    A method of manufacturing at least a portion of a workpiece by successive layer deposition, comprising the steps of: a) depositing a first layer (110) of a molten metal on a substrate (80) so as to forming a first bead on the substrate, b) depositing a second layer of molten metal on said first bead, thereby forming a second bead on said first bead, and c) repeating steps a) and b) for each new metal layer to be deposited above a previous bead, until the formation of the said at least part of the part, characterized in that it comprises, after n deposition step (s), n being greater than or equal to 1, a step of compressing the formed bead.
    [2" id="c-fr-0002]
    2. The method of claim 1, wherein the compression is carried out hot, that is to say before the complete cooling of said bead.
    [3" id="c-fr-0003]
    3. Method according to the preceding claim, wherein the compression step is performed when the material of said bead is at a temperature greater than 30 ° C, preferably greater than 100 ° C, more preferably greater than 200 ° C, and for example about 300 ° C.
    [4" id="c-fr-0004]
    4. Method according to one of the preceding claims, wherein the compression step is performed by projection of a compression air flow on said bead.
    [5" id="c-fr-0005]
    5. Method according to one of claims 1 to 3, wherein the compression step is carried out by shot blasting said bead.
    [6" id="c-fr-0006]
    6. Method according to the preceding claim, wherein the shot blasting is carried out with particles of a material identical to the material of a powder used for the manufacture of the cords, said particles preferably having a size different from the particle size of said powder.
    [7" id="c-fr-0007]
    7. The method of claim 5, wherein the shot peening is made with particles of a material different from the material used for the manufacture of the cords.
    [8" id="c-fr-0008]
    The method according to one of the preceding claims, wherein the compressing step is configured to allow: i) introduction of residual compressive stresses to counter residual tensile stresses produced by the fusion to minimize the deformations, and / or ii) etching of any oxide layer that would be created on the surface of the bead, and / or iii) a modification of the initial microstructure of the bead by shot blasting to obtain a homogeneous microstructure.
    [9" id="c-fr-0009]
    9. Device for implementing the method according to one of the preceding claims, characterized in that it comprises: - a laser head (104) for melting a filler metal for the formation of a cord and a nozzle (108) for compressing said cord (110).
    [10" id="c-fr-0010]
    10. Device according to the preceding claim, wherein the laser head (104) and the nozzle (108) are carried by a robot arm (120) common.
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    同族专利:
    公开号 | 公开日
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    法律状态:
    2017-01-09| PLFP| Fee payment|Year of fee payment: 2 |
    2017-08-25| PLSC| Publication of the preliminary search report|Effective date: 20170825 |
    2018-01-23| PLFP| Fee payment|Year of fee payment: 3 |
    2019-01-23| PLFP| Fee payment|Year of fee payment: 4 |
    2020-01-22| PLFP| Fee payment|Year of fee payment: 5 |
    2021-01-20| PLFP| Fee payment|Year of fee payment: 6 |
    2022-01-19| PLFP| Fee payment|Year of fee payment: 7 |
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