Additive manufacturing process for manufactured parts comprising identification markers, associated identification process and manufactured part

Abstract

Method for additive manufacturing of manufactured parts comprising identification markers, associated identification method and manufactured part The method for manufacturing a manufactured part (10) comprises additive manufacturing of the manufactured part (10) from a manufacturing material, the manufactured part (10) comprising a body (20) and a marker (30) for identifying the manufactured part (10), the additive manufacturing of the manufactured part (10) comprising the additive manufacturing of the body (20) and the additive manufacturing of the identification marker (30). The identification marker (30) is an identification element (32) embedded in the body (20) of the manufactured part (10), the identification element (32) being delimited by at least one geometric volume (34) strictly included in the volume of the body (20). Figure for the abstract: Figure 1

Description

Title of the invention: Method for additive manufacturing of manufactured parts comprising identification markers, associated identification method and manufactured part

[0001] The present invention relates to a method of manufacturing manufactured parts comprising additive manufacturing of the manufactured part from a manufacturing material, the manufactured part comprising a body and an identification marker of the manufactured part, the additive manufacturing of the manufactured part comprising additive manufacturing of the body and additive manufacturing of the identification marker.

[0002] The present invention further relates to a method for identifying a manufactured part to be identified, obtained by such a manufacturing method.

[0003] Also, the present invention relates to a manufactured part comprising such an identification marker, obtained by such a manufacturing method.

[0004] The identification of manufactured parts presents an important challenge. This identification must make it possible to distinguish one manufactured part from another manufactured part (which could be similar at first glance), to recognize the model of a part, its authenticity or its belonging to a product range or a brand.

[0005] This identification must be easy and secure. Indeed, confusing one manufactured part with another can have consequences on the safety of operators handling this part, on the safety and integrity of the equipment intended to interact with this part as well as on compliance with the intellectual property rights attached to it.

[0006] Several means of identifying manufactured parts are known from the state of the art.

[0007] A first means consists of affixing an identification marker in relief or in hollow on an external surface of the manufactured parts. However, in this case, the identification marker is visible from the outside of the part, easily identifiable and copyable.

[0008] Another way is to deposit on the external surface of the manufactured part an identification marker in the form of a layer of liquid containing a luminophore adapted to the material of the manufactured part. The liquid is visible only when irradiated by light radiation having an adequate wavelength. However, in this case, the manufacturing cycle of the manufactured part includes additional steps including the application of the layer of liquid, masking and cleaning of the part. Also, this method requires the development and production of a specific liquid that is compatible, low-polluting and presents little danger to operators handling the part.

[0009] Yet another way is to integrate a luminescent powder into the manufacturing material of the manufactured part. Thus, the entire part will integrate the luminescent marker. However, this process requires developing and producing a luminescent powder that does not impact the mechanical performance of the manufactured part, that is easy and inexpensive to produce and that is low-polluting.

[0010] An aim of the invention is then to propose a method for manufacturing manufactured parts which makes it possible to integrate discreet identification markers into said manufactured parts, in a safe, easy and environmentally friendly manner.

[0011] To this end, the invention relates to a method for manufacturing a manufactured part in which the identification marker is an identification element embedded in the body of the manufactured part, the identification element being delimited by at least one geometric volume strictly included in the volume of the body.

[0012] Thanks to these characteristics, the integration of the identification marker is carried out in parallel with the manufacture of the body of the manufactured part and so that the marker is invisible from the outside of the part. This facilitates the production of the manufactured part and reduces the risk of falsification of the identification marker.

[0013] According to other advantageous aspects of the invention, the manufacturing method comprises one or more of the following characteristics, taken in isolation or in all technically possible combinations:

[0014] - the at least one geometric volume is continuous;

[0015] - the identification element is associated with an identifier of the manufactured part included in a list of identifiers including:

[0016] - an indicator of compliance with specifications and / or standards by the part manufactured;

[0017] - an indicator of whether the manufactured part belongs to a type of part manufactured;

[0018] - an indicator of whether the manufactured part belongs to a category of parts manufactured for a given type of manufactured parts;

[0019] - a serial number of the manufactured part;

[0020] - an indicator of origin of the manufactured part;

[0021] - the body has a main material density, the identification element having an auxiliary material density different from the main material density so that a value of at least one identification parameter relating to the identification element is measurable by tomography, in particular by X-ray tomography;

[0022] - the value of the at least one identification parameter relating to the element identification is uniquely associated with the manufactured part identifier;

[0023] - the at least one identification parameter of the identification element of the part manufactured depends on a projection of said identification element onto a surface;

[0024] - the density of auxiliary material is less than or equal to 90% of the density of main material, preferably between 60% and 70% of the main material density;

[0025] - the at least one geometric volume of the identification element has three dimensions, one dimension among these three dimensions being less than or equal to the other two dimensions and being greater than or equal to 200 pm;

[0026] - the body of the manufactured part comprises a useful part and a part additional, the additional part being intended to undergo less mechanical stress than the useful part, the identification element being arranged in the additional part;

[0027] - the additive manufacturing of the manufactured part comprises:

[0028] - additive manufacturing of the body of the manufactured part so that the body of the manufactured part has a main porosity rate;

[0029] - the additive manufacturing of the identification element of said manufactured part of such that the identification element has an auxiliary porosity rate different from the main porosity rate;

[0030] - the manufacturing material is in the form of a powder, additive manufacturing of the body and / or the identification element of the manufactured part comprising the following steps:

[0031] - application of at least one layer of manufacturing material powder, the layer of powder extending substantially along a layer plane;

[0032] - fusion of at least one layer of powder to produce the manufactured part;

[0033] the fusion step being such that:

[0034] - at least a main portion of said layer of powder, intended to form part of the body of said manufactured part, is fused so that the body of the manufactured part has the main porosity rate; and

[0035] - at least one auxiliary portion of said layer of powder, intended to be part of the identification element of said manufactured part, is not fused or is fused so that the identification element has the auxiliary porosity rate;

[0036] - the body of the manufactured part has a first ratio equal to:

[0037] - a number of layers of powder composing the body and undergoing fusion; on

[0038] - a total number of powder layers making up the body;

[0039] the identification element of the manufactured part having a second ratio equal to:

[0040] - a number of layers of powder composing the identification element and undergoing a merger; on

[0041] - a total number of powder layers making up the identification element;

[0042] the first ratio being different from the second ratio; and

[0043] - the melting step is carried out by irradiation of the layer of material powder of fabrication in the layer plane by a laser beam or an electron beam, the irradiation being carried out along parallel scan lines extending in the layer plane, two adjacent scan lines being separated by an interline distance, the irradiation having a list of fusion parameters comprising:

[0044] - the power of the laser beam or electron beam;

[0045] - the speed of movement of the laser beam or electron beam along the scan lines; and / or

[0046] - the line spacing distance;

[0047] the value of at least one fusion parameter taken from the list of fusion parameters relating to the at least one main portion of said powder layer being different from the value of said at least one fusion parameter relating to the at least one auxiliary portion of said powder layer.

[0048] The invention also relates to a method for identifying a manufactured part to be identified, the manufactured part being obtained by the manufacturing method described above, the identification method comprising the identification of the manufactured part as a function of the identification element embedded in the body of the manufactured part.

[0049] According to other advantageous aspects of the invention, the identification method comprises one or more of the following characteristics, taken in isolation or in all technically possible combinations:

[0050] - the identification element is associated with an identifier of the manufactured part included in a list of identifiers, the list of identifiers including:

[0051] - an indicator of compliance with specifications and / or standards by the part manufactured;

[0052] - an indicator of whether the manufactured part belongs to a type of part manufactured;

[0053] - an indicator of whether the manufactured part belongs to a category of parts manufactured for a given type of manufactured parts;

[0054] - a serial number of the manufactured part;

[0055] - an indicator of origin of the manufactured part;

[0056] the identification method comprising the following steps:

[0057] - providing an identification database uniquely associating a value of at least one identification parameter relating to the identification element with the identifier of the manufactured part;

[0058] - measurement of the value of at least one identification parameter of the element identification of the manufactured part to be identified;

[0059] - identification of the manufactured part to be identified by comparison of the value of the at least one identification parameter measured with the value of the at least one identification parameter recorded in the database;

[0060] - the measurement of the value of the at least one identification parameter relating to the identification element of the manufactured part to be identified is carried out by tomography, preferably by X-ray tomography; and

[0061] - the at least one identification parameter relating to the identification element of the manufactured part depends on a projection of said identification element onto a surface.

[0062] The invention also relates to a manufactured part obtained by the manufacturing method described above, comprising a body and an identification marker manufactured by additive manufacturing, the identification marker being an identification element embedded in the body of the manufactured part, the identification element being delimited by at least one geometric volume strictly included in the volume of the body.

[0063] Optionally, the identification element is associated with an identifier of the manufactured part included in a list of identifiers, the list of identifiers comprising:

[0064] - an indicator of compliance with specifications and / or standards by the part manufactured;

[0065] - an indicator of whether the manufactured part belongs to a type of part manufactured;

[0066] - an indicator of whether the manufactured part belongs to a category of parts manufactured for a given type of manufactured parts;

[0067] - a serial number of the manufactured part;

[0068] - an indicator of origin of the manufactured part.

[0069] The invention will appear more clearly on reading the description which follows, given solely by way of non-limiting example, and made with reference to the drawings in which:

[0070] [Fig-1] [Fig.l] is a schematic representation of a step of the process identification according to the invention, in which a projection of the identification element is obtained by tomography;

[0071] [Fig.2] [Fig.2] is a schematic representation of several views of an example of a manufactured part produced by the manufacturing method according to the invention;

[0072] [Fig.3] [Fig.3] is a schematic representation of several views of another example of a manufactured part produced by the manufacturing method according to the invention;

[0073] [Fig.4] [Fig.4] is a schematic representation of the manufacturing process according to a main embodiment of the invention;

[0074] [Fig.5] [Fig.5] is a schematic representation of a fusion step of the manufacturing process of [Fig.4];

[0075] [Fig.6] [Fig.6] is a schematic representation of a melting step of the manufacturing process of [Fig.4];

[0076] [Fig.7] [Fig.7] is a schematic representation of the identification process according to the invention.

[0077] With reference to Figures 1 to 3, a manufactured part 10 according to the invention is described.

[0078] The manufactured part 10 comprises a body 20 and an identification marker 30 of the manufactured part 10.

[0079] The manufactured part 10 is made of a manufacturing material.

[0080] The manufacturing material is, for example, a metal or a plastic.

[0081] According to a main embodiment, as will be described in more detail below- below, the manufacturing material of the manufactured part 10, when the latter is finished, is in the form of an at least partially fused and / or sintered powder.

[0082] The manufactured part 10 is, for example, a mechanical part, in particular an aircraft mechanical part.

[0083] Advantageously, the body 20 has a main material density.

[0084] As illustrated in the example of Figures 1 to 3, the body 20 of the manufactured part 10 comprises a useful part 22 and an additional part 24.

[0085] The useful part 22 of the body 20 is intended to undergo mechanical forces during the use of the manufactured part 10. The additional part 24 is intended to undergo less mechanical forces than the useful part 22.

[0086] The identification marker 30 is an identification element 32 embedded in the body 20 of the manufactured part 10. By “embedded in the body”, it is meant that the identification element 32 is entirely included in the body 20 of the manufactured part 10. Thus, the identification element 32 is invisible from outside the body 20.

[0087] The identification element 32 is delimited by at least one geometric volume 34 strictly included in the volume of the body 20. For example, the at least one geometric volume 34 is continuous.

[0088] According to the examples of figures 1 to 3, the identification element 32 is arranged in the additional part 24 of the body 20 of the manufactured part 10.

[0089] Advantageously, the identification element 32 has a density of auxiliary material different from the density of main material of the body 20 so that a value of at least one identification parameter relating to the identification element 32 is measurable by tomography, in particular by X-ray tomography.

[0090] For example, the auxiliary material density is less than or equal to 90% of the main material density, preferably between 60% and 70% of the main material density.

[0091] The identification element 32 is, for example, associated with an identifier of the manufactured part 10 included in a list of identifiers.

[0092] The list of identifiers includes:

[0093] - an indicator of compliance with specifications and / or standards by the part manufactured 10;

[0094] - an indicator of belonging of the manufactured part 10 to a type of parts manufactured 10;

[0095] - an indicator of belonging of the manufactured part 10 to a category of parts manufactured 10 for a given type of manufactured parts 10;

[0096] - a serial number of the manufactured part 10;

[0097] - an indicator of origin of the manufactured part 10.

[0098] For example, the type of manufactured parts corresponds to the use for which the part is intended. For example, the indicator of an aircraft engine cylinder head part indicates that this part is an aircraft engine cylinder head.

[0099] For example, the category of manufactured parts corresponds to the quality of the manufactured part. Taking the example of the aircraft engine cylinder head, the associated indicator then indicates, for example, that the manufactured part is a civil-grade or military-grade aircraft engine cylinder head.

[0100] For example, the indicator of origin of the manufactured part corresponds to a logo or a brand (i.e. a sign making it possible to distinguish or recognize a product precisely), belonging for example to an entity having manufactured said manufactured part 10.

[0101] For example, the at least one geometric volume 34 has three dimensions, one of which is less than or equal to the other two dimensions while being greater than or equal to 200 pm.

[0102] In the examples of Figures 1 to 3, the identification element 32 has a three-dimensional shape of “i”. In particular, the identification element 32 is then formed by a parallelepiped corresponding to the bar of “i” and by a cylinder corresponding to the point of “i”. The parallelepiped and the cylinder each form a continuous geometric volume 34.

[0103] In the example of figures 1 and 2, the at least one geometric volume 34 is a continuous and full geometric volume.

[0104] In the example of [Fig.3], the at least one geometric volume 34 is a continuous and hollow geometric volume.

[0105] For example, the at least one identification parameter is qualitative or quantitative. The value of the at least one identification parameter is then qualitative or quantitative accordingly.

[0106] Advantageously, the at least one identification parameter of the identification element 32 of the manufactured part 10 depends on a projection 35 of said identification element 32 onto a surface 36. In particular, the projection 35 of said identification element 32 onto the surface 36 is obtained by tomography, in particular by X-ray tomography.

[0107] Advantageously, the at least one identification parameter of the identification element 32 is associated with the general shape of the projection 35 of the identification element 32 on the surface 36. The at least one identification parameter is then qualitative.

[0108] As illustrated in the examples of Figures 1 to 3, the projection 35 of the identification element 32 onto the surface 36 has a general shape of “i”. The general shape of “i” then constitutes, for example, the value of the at least one identification parameter which is the shape of the identification element 32.

[0109] Still advantageously, the at least one identification parameter of the identification element 32 is associated with a geometric parameter of the projection 35 of the identification element 32 on the surface 36. The at least one identification parameter is then quantitative.

[0110] With reference to the examples of Figures 1 to 3, the at least one identification parameter is, for example, the external diameter of the point of the “i”. The external diameter of the point of the “i” then constitutes, for example, the at least one identification parameter.

[0111] In particular, the value of the at least one identification parameter relating to the identification element 32 is uniquely associated with the identifier of the manufactured part 10.

[0112] According to a non-illustrated example, the projection of the identification element 32 onto the surface 36 is in the form of a two-dimensional barcode. The at least one associated identification parameter corresponds to the information contained in said barcode.

[0113] According to another non-illustrated example, the projection of the identification element 32 onto the surface 36 is in the form of a sequence of alphanumeric characters. The at least one associated identification parameter corresponds to said sequence of alphanumeric characters.

[0114] According to another non-illustrated example, the projection of the identification element 32 onto the surface 36 is in the form of a logo or a mark.

[0115] Advantageously, the manufactured part 10 is obtained by a manufacturing method 100, described in detail below.

[0116] With reference to Figures 4 to 6, the manufacturing method according to the invention is described.

[0117] The method of manufacturing the manufactured part 10 comprises a manufacturing 100% additive manufacturing of the manufactured part from the manufacturing material.

[0118] The additive manufacturing 100 of the manufactured part 10 comprises the additive manufacturing of the body 20 and the additive manufacturing of the identification marker 30.

[0119] Advantageously, the additive manufacturing of the body 20 and the additive manufacturing of the identification marker 30 are carried out simultaneously.

[0120] For example, the additive manufacturing 100 of the manufactured part 10 comprises:

[0121] - the manufacturing of the body 20 of the manufactured part 10 so that the body 20 of the manufactured part has a main porosity rate;

[0122] - the additive manufacturing of the identification element 32 of said manufactured part 10 so that the identification element 32 has an auxiliary porosity rate different from the main porosity rate.

[0123] In particular, the porosity rate can be measured by polishing the body 20 or the identification element 32 and by observation under a microscope. Alternatively, the porosity rate can be measured by tomography.

[0124] In the main embodiment illustrated in Figures 4 to 6, in the initial state, the manufacturing material is in the form of a powder.

[0125] Advantageously, the additive manufacturing of the body 20 and / or of the identification element 32 of the manufactured part 10 comprises a step 110 of applying at least one layer of powder 50 of manufacturing material and a step 120 of melting at least one layer of powder 50 of manufacturing material to produce the manufactured part 10.

[0126] As illustrated in [Fig.5], each layer of powder 50 extends substantially along a plane parallel to a plane of layer C.

[0127] Each layer of powder 50, in particular after fusion, is capable of forming a substrate on which another layer of powder 50 is intended to be applied, also intended to be fused. The successive application of layers of powder 50 on top of each other in an elevation direction E substantially perpendicular to the layer planes C and the fusion, if applicable, of these layers of powder 50 result in the formation of the manufactured object 10. This method is in particular called “additive manufacturing by powder bed fusion” (or “power bed fusion” in English).

[0128] With reference to Figures 5 and 6, the melting step 120 is in particular such that at least a main portion 52 of the corresponding powder layer 50, intended to form part of the body 20 of the manufactured part 10, is melted so that the body 20 of the manufactured part 10 has the main porosity rate. For example, the main material density of the body 20 of the manufactured part 10 depends on the main porosity rate.

[0129] Still with reference to Figures 5 and 6, the melting step 120 is further such that at least one auxiliary portion 54 of the corresponding powder layer 50, intended to be part of the identification element 32 of the manufactured part 10, is not melted or is melted so that the identification element 32 has the auxiliary porosity rate. For example, the auxiliary material density of the identification element 32 of the manufactured part 10 depends on the auxiliary porosity rate.

[0130] The body 20 of the manufactured part 10 has, for example, a first ratio equal to:

[0131] - a number of layers of powder 50 composing the body 20 and undergoing fusion 120 ; on

[0132] - a total number of powder layers 50 making up the body 20.

[0133] The identification element 32 of the manufactured part 10 has, for example, a second ratio equal to:

[0134] - a number of layers of powder 50 composing the identification element 32 and undergoing a 120 fusion; on

[0135] - a total number of powder layers 50 making up the identification element 32.

[0136] Advantageously, the first ratio is different from the second ratio.

[0137] For example, the main material density of the body 20 of the manufactured part 10 depends on the first ratio and the auxiliary material density of the identification element 32 of the manufactured part 10 depends on the second ratio.

[0138] For example, the first ratio is substantially equal to 1 and the second ratio is substantially equal to 0.5. In other words, according to this specific example, the main portion 52 of each corresponding powder layer 50 is fused and only one auxiliary portion 54 of powder layer 50 out of two is fused.

[0139] Advantageously, the melting step 120 is carried out by irradiating the powder layer 50 of manufacturing material in the layer plane C by a laser beam 56 or an electron beam. In particular, the irradiation is carried out along parallel scanning lines 58 extending in the layer plane C. As illustrated in [Fig.6], two adjacent scanning lines 58 are separated by an interline distance II, 12.

[0140] Further advantageously, the irradiation presents a list of fusion parameters comprising:

[0141] - the power of the laser beam 56 or the electron beam;

[0142] - the speed of movement of the laser beam or electron beam along the scanning lines 58; and / or

[0143] - the line spacing distance II, 12.

[0144] The porosity rate depends in particular on the melting parameters. Advantageously, the value of at least one melting parameter taken from the list of melting parameters relating to the at least one main portion 52 of the powder layer 50 is different from the value of said at least one melting parameter relating to the at least one auxiliary portion of said powder layer 50, in particular when the first ratio is substantially equal to the second ratio. This makes it possible in particular to obtain the main porosity rate and the auxiliary porosity rate, in particular when the first ratio is substantially equal to the second ratio.

[0145] According to the example illustrated in [Fig.6], the irradiation of the at least one main portion 52 of the powder layer 50 has an interline distance II and the irradiation of the at least one auxiliary portion 54 of the powder layer 50 has an interline distance 12 different from the interline distance II.

[0146] Advantageously, steps 110 and 120 are repeated until the manufactured part 10 is completely produced.

[0147] Advantageously, after the last melting step 120, the additive manufacturing 100 of the manufactured part further comprises a step 130 of sintering each of the powder layers 50.

[0148] With reference to Figures 1 and 7, a method 200 for identifying a manufactured part 10 to be identified is described, according to the invention, the manufactured part 10 to be identified being obtained by the manufacturing method 100.

[0149] The identification method 200 comprises the identification of the manufactured part as a function of the identification element 32 embedded in the body 20 of the manufactured part 10.

[0150] Advantageously, the identification method 200 comprises a step 210 of providing an identification database uniquely associating a value of at least one identification parameter relating to the identification element 32 with the identifier of the manufactured part 10.

[0151] The identification method 200 further comprises a step 220 of measuring the value of the at least one identification parameter of the identification element of the manufactured part 10 to be identified.

[0152] For example, the measurement of the value of the at least one identification parameter relating to the identification element 32 of the manufactured part 10 to be identified is carried out by tomography, preferably by X-ray tomography.

[0153] The identification method 200 further comprises a step 230 of identifying the manufactured part 10 to be identified by comparing the value of the at least one measured identification parameter with the value of the at least one identification parameter recorded in the database.

[0154] According to another embodiment not illustrated, the manufacturing material is in the form of a wire.

[0155] Advantageously, the additive manufacturing of the body 20 and / or of the identification element 32 of the manufactured part 10 comprises:

[0156] - a step of melting the wire;

[0157] - a step of applying the at least partially melted wire, for example through an extruder, to produce the manufactured part 10.

[0158] In the step of applying the wire, the wire is applied so as to form a layer of material extending in a plane parallel to a layer plane.

[0159] Each layer of material is capable of forming a substrate on which another layer of material is intended to be applied. The successive application of layers of material on top of each other in an elevation direction substantially perpendicular to the layer planes results in the formation of the manufactured object 10. This method is notably called “additive manufacturing by fused deposition modeling” (or “Fused deposition modeling” in English).

[0160] The melting step is such that at least a main portion of the layer of material, intended to form part of the body 20 of the manufactured part 10, is melted so that the body 20 of the manufactured part 10 has the main porosity rate.

[0161] The melting step is further such that at least one auxiliary portion of the layer of material, intended to form part of the identification element 32 of the manufactured part 10, is melted so that the identification element 32 has the auxiliary porosity rate.

[0162] Advantageously, the melting step is carried out by heating the wire in a heating nozzle.

[0163] The steps of melting the wire and applying the wire are repeated until the manufactured part 10 is completely produced.

[0164] Also advantageously, a melting parameter such as the heating power of the heating nozzle is associated with the melting step.

[0165] Also advantageously, the value of the heating power relative to the at least one main portion of the layer of material is different from the value of the heating power relative to the at least one auxiliary portion of the layer of material. This makes it possible in particular to obtain the main porosity rate and the auxiliary porosity rate.

[0166] Thanks to the invention, the identification marker 30 is invisible from the outside of the manufactured part 10. It is therefore impossible to detect with the naked eye, which considerably reduces the risk of it being copied and falsified.

[0167] Furthermore, thanks to the invention, the integration of the identification marker 30 into the manufactured part 10 does not require a dedicated step. This avoids complicating the manufacturing cycle of the manufactured part 10.

[0168] Furthermore, the invention makes it possible to avoid the use of a luminophore or a luminescent powder which may have an impact on the mechanical performance of the manufactured part 10 or which may have a non-zero environmental impact.

Claims

1. Claims A method of manufacturing a manufactured part (10) comprising an additive manufacturing (100) of the manufactured part (10) from a manufacturing material, the manufactured part (10) comprising a body (20) and a marker (30) for identifying the manufactured part (10), the additive manufacturing (100) of the manufactured part (10) comprising the additive manufacturing of the body (20) and the additive manufacturing of the identification marker (30), characterized in that the identification marker (30) is an identification element (32) embedded in the body (20) of the manufactured part (10), the identification element (32) being delimited by at least one geometric volume (34) strictly included in the volume of the body (20), wherein the additive manufacturing (100) of the manufactured part (10) comprises: - additive manufacturing of the body (20) of the manufactured part (10) so that the body (20) of the manufactured part (10) has a main porosity rate; - the additive manufacturing of the identification element (32) of said manufactured part (10) so that the identification element (32) has an auxiliary porosity rate different from the main porosity rate, in which the manufacturing material is in the form of a powder, the additive manufacturing of the body (20) and / or of the identification element (32) of the manufactured part (10) comprising the following steps: - application (110) of at least one layer of powder (50) of manufacturing material, the layer of powder (50) extending substantially along a layer plane (C); - melting (120) at least one layer of powder (50) to produce the manufactured part (10); the melting step (120) being such that: - at least a main portion (52) of said powder layer (50), intended to form part of the body (20) of said manufactured part (10), is fused so that the body (20) of the manufactured part (10) has the main porosity rate; and - at least one auxiliary portion (54) of said powder layer (50), intended to form part of the identification element (32) of said manufactured part (10), is not fused or is fused so that the identification element (32) has the auxiliary porosity rate.

2. A manufacturing method according to claim 1, wherein the at least one geometric volume (34) is continuous.

3. Manufacturing method according to claim 1 or 2, wherein the identification element (32) is associated with an identifier of the manufactured part (10) included in a list of identifiers comprising: - an indicator of compliance with specifications and / or standards by the manufactured part (10); - an indicator of belonging of the manufactured part (10) to a type of manufactured parts (10); - an indicator of belonging of the manufactured part (10) to a category of manufactured parts (10) for a given type of manufactured parts (10); - a serial number of the manufactured part (10); - an indicator of origin of the manufactured part (10).

4. Manufacturing method according to claim 3, wherein the body (20) has a main material density, the identification element (32) having an auxiliary material density different from the main material density so that a value of at least one identification parameter relating to the identification element (32) is measurable by tomography, in particular by X-ray tomography.

5. Manufacturing method according to claim 4, wherein the value of the at least one identification parameter relating to the identification element (32) is uniquely associated with the identifier of the manufactured part (10).

6. Manufacturing method according to claim 4 or 5, wherein the at least one identification parameter of the identification element (32) of the manufactured part depends on a projection (35) of said identification element (32) on a surface (36).

7. Manufacturing method according to any one of claims 4 to 6, wherein the density of auxiliary material is less than or equal to 90% of the density of main material, preferably between 60% and 70% of the density of main material.

8. Manufacturing method according to any one of the preceding claims, in which the at least one geometric volume (34) of the identification element (32) has three dimensions, one dimension among these three dimensions being less than or equal to the other two dimensions and being greater than or equal to 200 pm.

9. Manufacturing method according to any one of the preceding claims, in which the body (20) of the manufactured part (10) comprises a useful part (22) and an additional part (24), the additional part (24) being intended to undergo less mechanical stress than the useful part (22), the identification element (32) being arranged in the additional part (24).

10. Manufacturing method according to any one of the preceding claims, wherein the body (20) of the manufactured part (10) has a first ratio equal to: - a number of powder layers (50) making up the body (20) and undergoing a fusion (120); on - a total number of powder layers (50) making up the body (20); the identification element (32) of the manufactured part (10) having a second ratio equal to: - a number of powder layers (50) making up the identification element (32) and undergoing a fusion (120); on - a total number of powder layers (50) making up the identification element (32); the first ratio being different from the second ratio.

11. A manufacturing method according to any one of the preceding claims, wherein the melting step (120) is carried out by irradiating the powder layer (50) of manufacturing material in the layer plane (C) with a laser beam (56) or an electron beam, the irradiation being carried out along parallel scanning lines (58) extending in the layer plane (C), two adjacent scanning lines (58) being separated by an interline distance (II; 12), the irradiation having a list of melting parameters comprising: - the power of the laser beam (56) or the electron beam; - the speed of movement of the laser beam (56) or the electron beam along the scanning lines (58); and / or - the interline distance (II; 12); the value of at least one fusion parameter taken from the list of fusion parameters relating to the at least one main portion (52) of said powder layer (50) being different from the value of said at least one fusion parameter relating to the at least one auxiliary portion (54) of said powder layer (50).

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