Method for manufacturing at least two parts by additive manufacturing using laser powder bed fusion and associated intermediate product

Abstract

A method for manufacturing at least two parts (100, 200) by additive manufacturing using laser powder bed fusion, comprising the simultaneous formation of a first part (100) and a second part (200) by layer-by-layer fusion of a powder using a laser, the first and second parts (100, 200) being identical, joined to each other to form a single unit and positioned symmetrically with respect to an axis of symmetry (A) passing through a joining zone of the first and second parts (100, 200). Figure for the abstract: Fig 3

Description

Title of the invention: Method for manufacturing at least two parts by additive manufacturing using laser powder bed fusion and associated intermediate product technical field

[0001] The present invention relates to the manufacture of mechanical parts, such as a device for measuring aerodynamic quantities for a turbomachine, by additive manufacturing, and in particular by the laser powder bed fusion technique.

[0002] More specifically, the invention relates to a method for manufacturing at least two parts by additive manufacturing by laser powder bed fusion, and an intermediate product for additive manufacturing of first and second parts by laser powder bed fusion. Previous techniques

[0003] In the context of tests on a turbomachine, it is sometimes necessary to carry out measurements of the aerodynamic quantities, in particular pressure and temperature, of the gas flow flowing in the flow ducts of the turbomachine.

[0004] It is known to measure these aerodynamic quantities using an aerodynamic measurement device placed substantially radially in at least one of the flow channels. This measurement device 1 is generally called combs, probes, or rakes.

[0005] With reference to [Fig. 1], the aerodynamic measurement device 1 conventionally comprises a body 2 intended to be placed substantially transversely in the flow channel. The body 2 has a first free end 2A and a second opposing end 2B connected to a base 3 for attaching the measurement device 1 to the turbomachine's fan housing. The body 2 comprises a first cylindrical longitudinal portion 2a that forms a leading edge 4 from which a plurality of nozzles 5 extend, and a second streamlined longitudinal portion 2b having opposing first and second faces 6 and 7 that meet at an edge 8 which constitutes a trailing edge 9, opposite the leading edge 4. The body 2, formed by the first and second portions 2a, 2b, is hollow, and the base of the nozzles 5 has a plurality of holes 5a.

[0006] It is known to manufacture these measuring devices 1 by additive manufacturing, and in particular by the laser powder bed fusion technique commonly known as the "LBM process", from the Anglo-Saxon abbreviation Laser Beam Melting.

[0007] The LBM process consists of the selective consolidation of layers of metallic powder in air using a laser in order to build, layer by layer, a three-dimensional object. It can also be used for shaping polymers.

[0008] The LBM manufacturing process is computer-controlled. A digital file contains all the laser trajectory instructions layer by layer, enabling the fabrication of the part, such as the measuring device 1.

[0009] A build platform serves as the base for manufacturing the part, and a powder spreading device allows a layer of powder of the desired material to be spread onto the build platform to a desired thickness. This device can be a roller or a scraper that moves in translation along an axis on either side of the powder bed.

[0010] When the powder layer is deposited, one or more lasers selectively scan certain areas of the powder bed, corresponding to a slice of the part to be produced. The scanning pattern as well as all laser parameters, such as laser power, scanning speed, spacing between two laser passes, etc., are dictated by the digital file.

[0011] Passing the laser over the powder bed raises the powder to a temperature above its melting point. This creates a molten pool. As it cools, this pool solidifies, forming a bead of solid metal. Following the laser scanning of a powder layer, a two-dimensional cross-section of the desired part is thus obtained.

[0012] As the build platform descends, the powder spreading device deposits a new layer of powder on top of the previous one. A new laser scan is performed to consolidate a new section of the part.

[0013] Thus, iteratively, a three-dimensional part is reconstituted by successive consolidation of two-dimensional sections.

[0014] Due to their architecture, areas of certain parts manufactured by the LBM process require support during their LBM manufacturing to prevent them from sagging. Indeed, during the melting of these areas, the unconsolidated powder from the preceding layers is insufficient to ensure this support.

[0015] A known solution consists of generating, simultaneously with the manufacture of the part, one or more supports, manufactured in one piece with the part and extending between the manufacturing platform and the areas concerned to support the part and stabilize the structure.

[0016] Generally, and as shown in [Fig. 2], the manufactured measuring device 1 is oriented so that the general axis of the measuring device 1, and in particular of the body 2, extends horizontally, that is to say parallel to the plane passing through the manufacturing platform 10, with the trailing edge 9 opposite the manufacturing platform. 10, and this is to ensure minimal uncertainty and an optimal surface finish at the holes 5a and nozzles 5. This orientation avoids the need for a support removal step in the sampling areas. Such removal would significantly degrade the surface finish and therefore the airflow in this region.

[0017] However, when the measuring device 1 is manufactured in a horizontal position, the body 2 remains cantilevered.

[0018] Furthermore, the repetitive sequences of depositing a layer of powder, melting it with a laser, and then cooling it tend to impose a bending moment. The bending moment is maximum at the second end 2B of the body 2 and zero at the first end 2A, which is free and cantilevered. A deflection appears as the sequences progress, and the resulting contact between the deflected area of ​​the part and the scraper causes the part manufacturing process to stop. It is not possible to use the scraper's return stroke without risking disturbing the powder bed.

[0019] The sweeping direction is therefore imposed, from the base 3 towards the first free end 2A, the manufactured measuring device 1 being oriented so that the base 3 faces the scraper during the deposition of the new layer. This results in a longer manufacturing process for the measuring device 1.

[0020] In order to improve heat dissipation in the cantilevered area of ​​the body 2, a first support 11 is conventionally manufactured so as to extend between the edge 8 forming the trailing edge 9 and the manufacturing platform 10.

[0021] A second support 12 is manufactured so as to extend from the first face 6 of the second profiled longitudinal portion 2b of the body 2 to the manufacturing platform 10, and a third support 13, not visible in the perspective view of [Fig.2], extends similarly from the opposite second face 7 to the manufacturing platform 10.

[0022] Finally, a fourth support 14 is formed on the first end 2A of the body 2 of the measuring device 1. The first support 11 extends from the leading edge 4 to the manufacturing platform 10, ensuring good heat transfer between the leading edge 4 of the measuring device 1 and the manufacturing platform 10, which helps to avoid the formation of a bending moment.

[0023] In addition to the removal of the manufacturing platform 10, each manufactured part then requires an additional machining step to remove the supports, which leads to a significant overall loss of material.

[0024] In addition, each part requires the intervention of an operator at many stages of its manufacture, in particular to carry out the reloading of the powder and then the depowdering of the part obtained.

[0025] The manufacture of a measuring device 1 leads to a production that is costly in terms of time and materials. Description of the invention

[0026] The present invention therefore aims to overcome the aforementioned disadvantages and to provide a solution to optimize the time and quantity of material used in the manufacture of a part, such as a device for measuring aerodynamic quantities, by powder bed fusion.

[0027] The present invention relates to a method for manufacturing at least two parts by additive manufacturing by laser powder bed fusion, comprising the simultaneous formation of a first part and a second part by layer-by-layer fusion of a powder using a laser, the first and second parts being identical, joined to each other to form a single-piece assembly and placed in symmetry with respect to an axis of symmetry passing through a joining zone of the first and second parts.

[0028] The simultaneous manufacturing of two parts limits manufacturing time, notably by halving the number of interventions required by an operator. It also reduces the amount of powder used, notably by halving the number of manufacturing trays required.

[0029] The joining of first and second identical parts and their symmetry also makes it easier to manufacture a part having at least one cantilevered portion by improving heat dissipation and eliminating the need for support to support the end of these portions and limiting the deformations imposed by thermal cycling during their manufacture.

[0030] A significant saving of time and material is achieved.

[0031] Advantageously, the simultaneous formation of the first and second parts by layer-by-layer melting of the powder can be carried out on a manufacturing platform.

[0032] Preferably, the manufacturing platform and the first and second parts form a single unit.

[0033] Advantageously, the axis of symmetry can be perpendicular to the plane passing through the manufacturing platform and the general longitudinal axis of the assembly formed by the first and second parts being parallel to the plane passing through the manufacturing platform, the first and second parts each comprising a body.

[0034] Advantageously, the first and second parts can be connected to each other by a first end of the body positioned at a distance from the manufacturing platform.

[0035] In one embodiment, the first and second parts can each form a device for measuring aerodynamic quantities for a turbomachine.

[0036] Advantageously, the body of the first and second parts can be positioned at a distance from the manufacturing platform.

[0037] In one embodiment, the body of the first and second parts may include a first longitudinal portion of cylindrical shape which forms a leading edge from which a plurality of nozzles extend, and a second longitudinal portion profiled having first and second opposite faces joining in an edge which forms a trailing edge opposite the leading edge and oriented towards the manufacturing platform, and the body of the first and second parts may include a second end connected to a base connected to the manufacturing platform.

[0038] Preferably, the manufacturing process includes, simultaneously with the formation of the first and second parts, the formation of at least one support intended to support the first and second parts during their manufacture.

[0039] Advantageously, the support and the first and second parts can form a single unit.

[0040] Advantageously, the manufacturing process may include the formation for each of the first and second parts of a first support extending from the edge forming the trailing edge to the manufacturing platform.

[0041] Advantageously, the manufacturing process may include the formation of a second support extending from the first face of the second profiled longitudinal portion of the body to the manufacturing platform.

[0042] Advantageously, the manufacturing process may include the formation of a third support extending from the second face of the second profiled longitudinal portion of the body to the manufacturing platform.

[0043] The invention also relates to an intermediate product for additive manufacturing of first and second parts by laser powder bed fusion, comprising a single-piece assembly of identical first and second parts connected to each other and placed symmetrically with respect to an axis of symmetry passing through a connection zone of the first and second parts.

[0044] Advantageously, the one-piece assembly may include a manufacturing platform.

[0045] Advantageously, the axis of symmetry may be perpendicular to the passing plane by the manufacturing platform and the general longitudinal axis of the assembly formed by the first and second parts being parallel to the plane passing through the manufacturing platform;

[0046] Advantageously, the first and second parts can each comprise a body, the first and second parts being connected to each other by a first end of the body positioned at a distance from the manufacturing platform.

[0047] Preferably, the intermediate product includes at least one support intended to support the first and second parts during their manufacture.

[0048] Advantageously, the one-piece assembly includes the first and second parts and the support.

[0049] In one embodiment, the first and second parts can each form a device for measuring aerodynamic quantities for a turbomachine.

[0050] Advantageously, the body of the first and second parts can be positioned at a distance from the manufacturing platform.

[0051] In one embodiment, the body of the first and second parts may include a first longitudinal portion of cylindrical shape which forms a leading edge from which a plurality of nozzles extend, and a second longitudinal portion profiled having first and second opposite faces joining in an edge which forms a trailing edge opposite the leading edge and oriented towards the manufacturing platform, and the body of the first and second parts may include a second end connected to a base connected to the manufacturing platform.

[0052] Advantageously, each of the first and second parts of the intermediate product can include a first support extending from the edge forming the trailing edge to the manufacturing platform.

[0053] Advantageously, each of the first and second parts of the intermediate product may include a second support extending from the first face of the second profiled longitudinal portion of the body to the manufacturing platform.

[0054] Advantageously, each of the first and second parts of the intermediate product may include a third support extending from the second face of the second profiled longitudinal portion of the body to the manufacturing platform. Brief description of the drawings

[0055] The present invention will be better understood and other objects, advantages and features will become apparent from the detailed description that follows, including embodiments given by way of illustration only and made with reference to the accompanying drawings, presented as non-limiting examples, which may serve to complete the understanding of the invention and the explanation of its implementation and, where appropriate, contribute to its definition, on which:

[0056] [Fig-1] represents a device for measuring aerodynamic quantities according to art prior.

[0057] [Fig.2] is a perspective view of a device for measuring aerodynamic quantities manufactured by a powder bed fusion manufacturing process according to the prior art.

[0058] [Fig.3] is a perspective view of a device for measuring aerodynamic quantities manufactured by a powder bed fusion manufacturing process according to an embodiment of the invention.

[0059] In the description of the invention that will be given, the expression "at least one" used shall be considered equivalent to the expression "one or more". Detailed description of at least one embodiment

[0060] Fig. 3 illustrates a set of first and second measuring devices 100, 200 of aerodynamic quantities, such as temperature and pressure, for turbomachine manufactured by an additive manufacturing process by laser powder bed fusion according to an embodiment of the invention.

[0061] The manufacturing process includes the simultaneous formation of the first and second measuring devices 100, 200 by layer-by-layer fusion of a powder using a laser.

[0062] Advantageously, a manufacturing platform 10 serves as a basis for manufacturing the first and second measuring devices 100, 200.

[0063] The powder is, for example, a metallic material or a polymer material, such as a composite polymer material.

[0064] Advantageously, a powder spreading device allows a layer of powder to be spread on the manufacturing tray 10. The spreading device can be a roller or a scraper which moves in translation from one end to the other of the manufacturing tray 10.

[0065] When the powder layer is deposited, a laser selectively scans certain areas of the powder bed, corresponding to a slice of the measuring devices 100, 200 to be made.

[0066] Passing the laser over the powder bed raises the powder to a temperature above its melting point. This creates a molten bath. As it cools, this bath solidifies, forming a bead of solid material. Following the laser scan of a powder layer, a two-dimensional cross-section of the desired measuring devices 100, 200 is thus obtained.

[0067] As the manufacturing platform 10 descends, the powder spreading device deposits a new layer of powder on top of the previous one. A new laser scan is performed to consolidate a new slice of the measuring devices 100, 200.

[0068] The first and second measuring devices 100, 200 in three dimensions are thus formed by successive consolidation of sections in two dimensions.

[0069] The first and second measuring devices 100, 200 and the manufacturing platform 10 obtained form a single-piece intermediate product.

[0070] The first and second measuring devices 100, 200 formed are identical and connected to each other, thus forming a single unit.

[0071] As can be seen in [Fig. 3], the first and second measuring devices 100, 200 are placed symmetrically with respect to each other with respect to an axis of symmetry A. The axis of symmetry A extends along the connection area of ​​the first and second measuring devices 100, 200.

[0072] In other words, the first measuring device 100 is positioned in mirror image with respect to the second measuring device 200.

[0073] A manufacturing platform 10 then allows two parts to be manufactured and the number of manufacturing platforms 10 used is divided by two.

[0074] The number of interventions to be carried out by an operator. Changes of manufacturing trays and powder reloading being the main steps requiring direct action by an operator during manufacturing.

[0075] In the illustrated example, the first and second parts 100, 200 are oriented in a horizontal position. The general longitudinal axis X of the assembly formed by the first and second parts 100, 200 is parallel to the plane passing through the manufacturing platform 10, and the axis of symmetry A is therefore perpendicular to the plane passing through the manufacturing platform 10.

[0076] In the illustrated example, the first and second measuring devices 100, 200, which are identical, each comprise a body, respectively 102 and 202.

[0077] The body of the first measuring device 100 and the body of the second measuring device 200 comprise a first longitudinal portion, respectively 102a and 202a, of cylindrical shape which forms a leading edge 104, 204.

[0078] A plurality of nozzles 105, 205, intended to receive sensors, such as temperature and pressure sensors, extend over the first longitudinal portion 102a and 202a, from the leading edge 104, 204.

[0079] The body of the first measuring device 100 and the body of the second measuring device 200 further comprise a second longitudinal portion 102b, 202b profiled having first and second faces 106, 206 opposite extending from the longitudinal portion 102b, 202b and joining in an edge 108, 208 which forms a trailing edge 109, 209, opposite the leading edge 104, 204.

[0080] The base of the nozzles 105, 205 has a plurality of holes 105a, 205a.

[0081] The body 102 of the first measuring device 100 includes a first end 102A connected to a first end 202A of the body 202 of the second measuring device 200. The axis of symmetry A extends along the connection area formed at the interface between the first end 102A of the body 102 of the first measuring device 100 and the first end 202A of the body of the second measuring device 200.

[0082] Furthermore, the body 102 of the first measuring device 100 includes a second end 102B opposite the first end 102A and the body 202 of the second measuring device 200 includes a second end 202B opposite the first end 202A.

[0083] Each of the second ends 102B, 202B is connected to a base 103, 203. The base 103, 203 of each of the first and second measuring devices 100, 200 is connected to the manufacturing platform 10.

[0084] The trailing edge 9 of the first and second measuring devices 100, 200 is oriented with respect to the manufacturing platform 10.

[0085] The first and second measuring devices 100, 200 manufactured are oriented so that the nozzles 105, 205 and the holes 105a, 205a arranged on the leading edge 104, 204 are positioned opposite the manufacturing platform 10. This orientation makes it possible to avoid the need for a machining step at the sampling areas, by ensuring a minimum uncertainty and an optimal surface finish at the holes 5a and the nozzles 5.

[0086] The body 102 of the first measuring device 100 and the body 202 of the second measuring device 200 are positioned at a distance from the manufacturing platform 10.

[0087] Furthermore, the horizontal position of the first and second measuring devices 100, 200 and the connection of the first ends 102A, 202A by symmetry of the first and second measuring devices 100, 200 makes it possible to avoid the cantilevered configuration of the body 102, 202 of the first and second measuring devices 100, 200. It is thus possible to eliminate the presence of a support intended to support the first ends 102A, 202A of the body 102, 202 during manufacturing and to save a significant amount of powder.

[0088] This results in better dissipation of thermal stresses and the suppression of deformations imposed by thermal cycling at the first ends 102A, 202A of the body 102, 202.

[0089] The suppression of the formation of these deformations at the level of the first ends 102A, 202A of the body 102, 202 by the connection of the first and second measuring devices 100, 200 and their symmetry makes it possible to exploit a sweep direction R of the spreading device going and returning.

[0090] The layer of powder deposited at each forward and return sweep allows the measuring devices 100, 200 to be formed progressively. The scraper makes repeated back and forth movements between the bases 103 and 203 of the first and second measuring devices 100, 200.

[0091] The back-and-forth sweeping, for example, carried out by scraping with a scraper.

[0092] The use of both scanning directions greatly reduces the fusion time and The scraping time is divided by four, resulting in a reduced manufacturing time.

[0093] Preferably, simultaneously with the formation of the first and second measuring devices 100, 200, the manufacturing process includes the formation of one or more supports intended to support the first and second parts 100, 200 during their manufacture.

[0094] In the illustrated example, a first support 111,211 extends from the edge 108, 208 forming the trailing edge 109, 209 of each of the first and second measuring devices 100, 200 to the manufacturing platform 10.

[0095] In addition, a second support 112, 212 extends from the first face 106, 206 of the second longitudinal portion 102b, 202b profiled of the body 102, 202 of each of the measuring devices 100, 200 to the manufacturing platform 10.

[0096] A third support also extends from the second face, not visible on the [Fig.3], from the second longitudinal portion 102b, 202b profiled of the body 102, 202 of each of the measuring devices 100, 200 to the manufacturing platform 10.

[0097] The first supports 111, 211, the second supports 112, 212 and the third supports ensure the heat dissipation of the body 102, 202 of the first and second measuring device 100, 200 between the first end 102A, 202A and the second end 102B, 202B, and disposed at a distance from the manufacturing platform 10.

[0098] In the illustrated example, an intermediate product comprises a single-piece assembly formed by the first and second measuring devices 100, 200.

[0099] The manufacturing platform 10, the first supports 111, 211, the second supports 112, 212 and the third supports 213 are advantageously obtained at the end of the powder bed fusion manufacturing process.

[0100] Advantageously, the manufacturing process may further include a step of separating the measuring devices 100, 200 obtained from each other.

[0101] Advantageously, the manufacturing process can also include a step of separating the measuring devices 100, 200 obtained from the manufacturing platform 10 and the first supports 111, 211, the second supports 112, 212 and the third supports.

[0102] According to one characteristic, the separation can be achieved by machining, electro-erosion and / or manual adjustment.

[0103] Advantageously, the manufacturing process can also include a depowdering step, after separation, of the measuring devices 100, 200 obtained.

[0104] By depowdering, we mean the removal of powder that was not fused during manufacturing.

[0105] The manufacturing process according to the invention makes it possible to reduce the number of separation steps. Overall, the number of separation steps can be halved, as each cut can be performed on two parts simultaneously.

[0106] The depowdering times performed by machines and operators are also reduced.

[0107] The manufacturing process according to the invention makes it possible to reduce manufacturing, depowdering and decoupling times while reducing the material used to manufacture the parts.

[0108] It may be envisaged that the manufacturing process includes the simultaneous formation of more than two parts, in particular connected in pairs and placed in pairs symmetrically.

[0109] In the illustrated example, the first and second parts formed by the laser powder bed fusion manufacturing process according to the invention are aerodynamic measurement devices for turbomachinery. This example is not limiting, so that the first and second parts could constitute any type of part, whether in the aerospace field or any other technological field.

Claims

Demands

1. A method for manufacturing at least two parts (100, 200) by additive manufacturing by laser powder bed fusion, comprising the simultaneous formation of a first part (100) and a second part (200) by layer-by-layer fusion of a powder using a laser, the first and second parts (100, 200) being identical, joined to each other to form a single-piece assembly and placed in symmetry with respect to an axis of symmetry (A) passing through a joining zone of the first and second parts (100, 200).

2. A method according to claim 1, wherein the simultaneous formation of the first and second parts (100, 200) by layer-by-layer melting of the powder is carried out on a build platform (10), the build platform (10) and the first and second parts (100, 200) forming a single unit, the axis of symmetry (A) being perpendicular to the plane passing through the build platform (10) and the general longitudinal axis (X) of the unit formed by the first and second parts (100, 200) being parallel to the plane passing through the build platform (10), the first and second parts (100, 200) each comprising a body (102, 202), the first and second parts (100, 200) being connected to each other by a first end (102A, 202A) of the body (102, 202) positioned at a distance from the build platform. (10).

3. A method according to claim 2, wherein the first and second parts (100, 200) each form a device for measuring aerodynamic quantities for a turbomachine, the body (102, 202) of the first and second parts (100, 200) being positioned at a distance from the manufacturing platform (10) and comprising a first cylindrical longitudinal portion (102a, 202a) which forms a leading edge (104, 204) from which a plurality of nozzles (105, 205) extend, and a second streamlined longitudinal portion (102b, 202b) having opposing first and second faces (106, 206) extending from the first longitudinal portion (102b, 202b) and meeting at an edge (108, 208) which forms an opposing trailing edge (109, 209). at the leading edge (104, 204) and oriented with respect to the manufacturing platform (10), and the body (102, 202) of the first and second parts (100, 200) comprising a second end (102B, 202B) connected to a base (103, 203) connected to the manufacturing platform (10).

4. A method according to any one of the preceding claims, comprising, simultaneously with the formation of the first and second parts (100, 200), the formation of at least one support intended to support the first and second parts (100, 200) during their manufacture, the support and the first and second parts (100, 200) forming a single unit.

5. A method according to claims 3 and 4, comprising the formation for each of the first and second parts (100, 200) of a first support (111, 211) extending from the edge (108, 208) forming the trailing edge (109, 209) to the manufacturing platform (10), the formation of a second support (112, 212) extending from the first face (106, 206) of the second profiled longitudinal portion (102b, 202b) of the body (102, 202) to the manufacturing platform (10), and the formation of a third support extending from the second face of the second profiled longitudinal portion (102b, 202b) of the body (102, 202) to the manufacturing platform (10).

6. Intermediate product for additive manufacturing of first and second parts (100, 200) by laser powder bed fusion, comprising a single-piece assembly of identical first and second parts (100, 200) connected to each other and placed in symmetry with respect to an axis of symmetry (A) passing through a joining zone of the first and second parts (100, 200).

7. Intermediate product according to claim 6, wherein the one-piece assembly comprises a manufacturing platform (10).

8. Intermediate product according to claim 7, wherein the axis of symmetry (A) is perpendicular to the plane passing through the manufacturing platform (10) and the general longitudinal axis (X) of the assembly formed by the first and second parts (100, 200) is parallel to the plane passing through the manufacturing platform (10), the first and second parts (100, 200) each comprising a body (102, 202), the first and second parts (100, 200) being connected to each other by a first end (102A, 202A) of the body (102, 202) positioned at a distance from the manufacturing platform (10).

9. An intermediate product according to claim 8, wherein the first and second parts (100, 200) each form a device for measuring aerodynamic quantities for

10. turbomachine, the body (102, 202) of the first and second parts (100, 200) being positioned at a distance from the manufacturing platform (10) and comprising a first longitudinal portion (102a, 202a) of cylindrical shape which forms a leading edge (104, 204) from which extend a plurality of nozzles (105, 205), and a second longitudinal portion (102b, 202b) of streamlined shape having first and second faces (106, 206) meeting at an edge (108, 208) which forms a trailing edge (109, 209) opposite the leading edge (104, 204) and oriented towards the manufacturing platform (10), and the body of the first and second parts (100, 200) comprising a second end (102B, 202B) connected to a base (103, 203) connected to the manufacturing platform (10). Intermediate product according to claim 9, comprising at least one support for supporting the first and second parts (100, 200) during their manufacture, the one-piece assembly comprising the first and second parts (100, 200) and the support.

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