METHOD FOR MANUFACTURED A RETAINING FLANGE FOR AN OUTER RING OF A BEARING

Abstract

To manufacture a retaining flange (20) intended to fit into a groove (22) of an outer ring (14) of a bearing (12), from a metal plate (37) having a plate thickness measured between a front face (201) and an opposite rear face (202) of the metal plate (37), at least two steps are carried out. By penetrating a first tool (40), along a reference axis (1) perpendicular to the plate (37) and in a direction of penetration (A) from the front face (201) to an intermediate depth less than the plate thickness (37), material initially located inside a front geometric envelope (41) is displaced into a volume located axially between the intermediate depth and the rear face (202) of the retaining flange (20), and delimited by a roughing geometric envelope (39).Then, by penetration of a second tool (42) along the reference axis (1) and in the direction of penetration (A), the plate (37) is perforated to form a final bore (24) having a rear geometric envelope (43) located, in projection onto a plane perpendicular to the reference axis (1), radially inside the front geometric envelope (41) and outside the roughing geometric envelope (39). (Fig.2).

Description

Title of the invention: METHOD FOR MANUFACTURING A FLANGE FOR HOLDING AN OUTER RING OF A BEARING Technical field of the invention

[0001] The invention relates to a method of manufacturing a retaining flange for an outer bearing ring, to a retaining flange obtained by this method, and to a rotation guide assembly incorporating such a retaining flange.

[0002] The invention applies more particularly to holding flanges for holding and guiding an outer bearing ring during its assembly inside a casing, for example a transmission or engine casing, in particular an electric motor, of a motor vehicle. Such holding flanges do not necessarily have a function once the transmission box is assembled. State of the prior art

[0003] Document FR 3032500 describes a method for assembling a retaining flange in a groove of an outer bearing ring, formed between a front surface of the ring having a first diameter and a rear surface of the ring having a second diameter greater than the first diameter. The retaining flange has a bore whose diameter is between said first and second diameters, a mounting lug which projects radially inward relative to the diameter of the bore, and at least one assembly member which is radially deformable between a mounting state and a mounted state. To assemble the retaining flange on the outer bearing ring, the mounting lug is arranged in the groove, then the assembly member is radially deformed to be arranged at least partially in the groove.This assembly must imperatively preserve a functional clearance sufficient to allow movement of the bearing ring in the retaining flange. In practice, this type of retaining flange can be used to facilitate blind mounting of a bearing in a housing. After mounting the bearing on a shaft and the retaining flange on the outer ring of the bearing, the subassembly thus formed is introduced blindly into a transmission housing. Threaded rods or screws, passing through mounting holes in a bottom plate of the housing, are screwed into tapped holes in the retaining flange, and allow the flange to be gradually brought into a final position, by indirectly exerting an axial force on the outer ring of the bearing allowing positioning, in particular adjustment or shrinking of this ring ex. in a housing provided for this purpose in the bottom plate of the housing. In this assembly phase, it is essential to provide clearance between the bearing ring and the retaining flange, on the one hand, to allow the bearing ring sufficient freedom of positioning to ensure its centering in the shrink housing, and, on the other hand, to allow the retaining flange freedom of rotation guaranteeing a purely axial force on the threaded rods or screws ensuring assembly, in order to avoid their shearing and / or bending.

[0004] The retaining flange, which has a relatively large thickness to give it good stiffness, is intended to be manufactured in a stamping step and a press cutting step. However, it is noted that it is difficult to control the dimensions of the bore over the entire thickness of the plate, because the press cutting is only clean over a part of the thickness of the plate, and is more like a tear over another part of the thickness of the plate. As a result, the manufacturing and assembly tolerances do not allow the desired degree of freedom of movement to be guaranteed between the retaining flange and the outer bearing ring. Statement of the invention

[0005] The invention aims to remedy the drawbacks of the state of the art and to propose a method for manufacturing a retaining flange of the preceding type, in a limited number of operations, the resulting retaining flange making it possible to limit the problems described above encountered during assembly.

[0006] To do this, according to a first aspect of the invention, a method of manufacturing a retaining flange intended to be inserted into a groove of an outer ring of a bearing, from a metal plate having a plate thickness measured between a front face and an opposite rear face of the metal plate, the method being characterized in that it comprises at least the following two steps: • by penetration of a first tool, along a reference axis perpendicular to the plate and in a direction of penetration from the front face over an intermediate depth less than the plate thickness, material initially located inside a front geometric envelope is pushed into a volume located beyond the first tool in the direction of penetration and delimited by a rough geometric envelope, the rough geometric envelope being located, in projection on a plane perpendicular to the reference axis,inside the front geometric envelope, the front geometric envelope comprising at least two cylindrical portions centered on the reference axis, separated by at least one holding notch and one assembly notch projecting radially opposite, the reference axis relative to the cylindrical portions; • by penetration of a second tool along the reference axis and in the direction of penetration, the plate is perforated to form a final bore having a rear geometric envelope located, in projection on a plane perpendicular to the reference axis, radially inside the front geometric envelope and outside the roughing geometric envelope.

[0007] In this definition and throughout the disclosure, the rough geometric envelope, the front geometric envelope and the rear geometric envelope are three closed surfaces.

[0008] At the end of penetration by the first tool, the flange blank has, on its part located inside the front geometric envelope, between the blank geometric envelope and the front geometric envelope, a thickness corresponding to the difference between the initial thickness of the plate and the penetration depth of the first tool. The cutting of the final bore by penetration of the second tool is therefore carried out on a thickness less than the initial thickness of the plate, which makes it possible to considerably reduce the tearing effect at the end of cutting, and thus to better control the dimensions of the final bore.

[0009] The resulting retaining flange has, around the periphery of the final bore, in the space between the front geometric envelope and the rear geometric envelope, a reduced thickness, corresponding to the difference between the initial thickness of the plate and the penetration depth of the first tool. This reduced thickness is preferably chosen to be strictly less than the width of the groove formed in the outer ring for which the retaining flange is intended. The portion of the retaining flange whose thickness remains equal to the initial thickness of the plate is located radially outside the front geometric envelope, and does not risk coming into contact with the outer bearing ring in the nominal position.

[0010] For assembly line production, the tools may be arranged at different forming stations and the metal plates conveyed from one forming station to the next by any suitable means, for example by a conveyor belt. Each station is equipped with a lower die on which the metal plate rests and is held at each forming step. The tools may be driven by any suitable means, for example by one or more mechanical or hydraulic presses. Preferably, a single press carries, among other things, the first and second tools, which thus work synchronously on the metal plates which are conveyed from one station to the other at each press lift.

[0011] During the first tool penetration step, the repelled material may be contained in a die facing the first tool. Alternatively, a preliminary step is provided in which a roughing tool penetrates along the axis of reference in the direction of penetration from the front face, to perforate the plate and form a roughing hole having as its outline the roughing geometric envelope surrounding the reference axis. In this hypothesis, the material pushed back by the penetration of the first tool enters the roughing hole. The roughing tool for perforating the plate can be a punch of any shape, for example a circular or rectangular punch, with a section equal to the section of the roughing geometric envelope.

[0012] The metal plate is preferably rectangular.

[0013] According to one embodiment, the assembly notch of the front geometric envelope is perforated along the reference axis to form a hole and a plastically deformable assembly member located between the hole and the rear geometric envelope. The perforation is preferably carried out during the penetration step of the first tool or the penetration step of the second tool. The assembly member formed on the notch of the front geometric envelope is then obtained without an additional step.

[0014] According to one embodiment, the rear geometric envelope comprises cylindrical portions centered on the reference axis, two of the cylindrical portions being located on either side of a first singularity of the rear geometric envelope, the first singularity being located radially in the extension of the holding notch, to form a tab of thickness less than the thickness of the metal plate projecting radially towards the reference axis relative to the cylindrical portions of the rear geometric envelope. The tabs will be formed in the material resulting from the step of pushing the material between the front geometric envelope and the rough geometric envelope.

[0015] According to one embodiment, the first singularity comprises connection zones between the tongue and the two cylindrical portions located on either side of the first singularity, the connection zones extending radially outside the cylindrical portions located on either side of the first singularity.

[0016] According to one embodiment, the rear geometric envelope comprises at least one second singularity located between two adjacent cylindrical portions among the cylindrical portions of the rear geometric envelope, radially in the extension of the assembly notch, the second singularity comprising connection zones with the two adjacent cylindrical portions, the connection zones of the second singularity extending: - radially outside the cylindrical portions of the rear geometric envelope and axially over the thickness of the rear geometric envelope, or; - radially outside the cylindrical portions of the rear geometric envelope and axially over the entire thickness of the retaining flange.

[0017] According to a preferred embodiment, the front geometric envelope comprises in all two diametrically opposed cylindrical portions, and a holding notch and an assembly notch separating the two cylindrical portions of the front geometric envelope, the holding notch and the assembly notch being diametrically opposed.

[0018] According to one embodiment, the perforations are made by punching.

[0019] The first tool is a punch with a section equal to the section of the geo envelope front metric. It performs a stamping that can be done hot or cold. The second tool used to perforate the plate is a cylindrical punch whose section is between the section of the rough geometric envelope and the section of the front geometric envelope, the punch allowing to obtain an at least partially clean cut.

[0020] According to one embodiment, mounting holes and holding holes are cut out in the plate, radially outside the front geometric envelope of the plate, the holding holes serving to hold the plate during the manufacturing steps. The holding holes may be located radially outside the threaded mounting holes. The threaded mounting holes make it possible to fix the holding flange to the vehicle casing using fixing elements.

[0021] According to one embodiment, at the end of manufacturing the plate, a contour of the plate is cut out, surrounding the mounting holes and located radially inside the holding holes. The contour of the plate is produced at the end of the flange manufacturing steps, using a cutting tool.

[0022] According to various methods of implementation: • the intermediate depth is greater than a third of the thickness of the plate, and / or • the intermediate depth is less than two-thirds of the thickness of the plate, and / or • the difference between the thickness of the plate and the intermediate depth is greater than 1mm and less than 3mm, and / or • the intermediate depth is greater than 1 mm and less than 3 mm, and / or • the thickness of the plate is greater than 3 mm, for example 4 mm, and in less than 6 mm.

[0023] According to one embodiment, the second tool produces a sharp edge at the intermediate depth and a clean cut of the final bore over a depth of at least 0.5 mm from the sharp edge in the direction of penetration. Preferably, the clean cut is carried out over the entire thickness of the plate.

[0024] According to various preferred dimensions: • the cylindrical portions of the front geometric envelope are located at a radial distance from the final bore which is greater than 0.1 mm, and preferably greater than 0.5 mm, and less than 1.0 mm, preferably less than 0.7 mm; and / or • the cylindrical portions of the front geometric envelope are located at a radial distance from the rough geometric envelope which is greater than 1 mm, and preferably greater than 3 mm, and less than 10 mm, preferably less than 7 mm.

[0025] According to another aspect of the invention, the latter relates to a method of manufacturing a rotational guide assembly intended to be mounted inside a casing, comprising the manufacture of a retaining flange as described above, and the mounting of the retaining flange in a groove of an outer ring of a bearing, the groove having a front bearing surface having a first diameter and a rear bearing surface having a second diameter greater than the first diameter, characterized in that the tongue of the retaining flange is inserted into the groove of the outer ring of the bearing and in that the assembly member is plastically deformed to insert it radially and at least partially into the groove, with a clearance greater than 0.1 mm between the deformed assembly member and the bottom of the groove.

[0026] According to another aspect of the invention, it relates to a rotation guide assembly intended to be mounted inside a casing, obtained by the preceding manufacturing method. Brief description of the figures

[0027] Other characteristics and advantages of the invention will emerge on reading the description which follows, with reference to the appended figures: • [Fig. 1] is a partial representation in longitudinal section of a mounting of a rotating shaft in a housing by means of a bearing held in position by a holding flange according to one embodiment of the invention; • [Fig.2a] and [Fig.2b] represent in perspective the two faces of the retaining flange of [Fig.l]; • [Fig.3a] and [Fig.3b] respectively represent a longitudinal section of a roughing tool performing a preliminary manufacturing step, and a front view of the holding flange of figures 2a and 2b at this preliminary manufacturing step; • [Fig.4a] and [Fig.4b] respectively represent a longitudinal section of a first tool carrying out a first manufacturing step, and a view of face of the retaining flange of figures 2a and 2b at this first stage of manufacturing; • [Fig.5a] and [Fig.5b] respectively represent a longitudinal section of the tools carrying out a second manufacturing step, and a front view of the holding flange of figures 2a and 2b at this second manufacturing step. • [Fig.6] represents in longitudinal section a variant of the step carried out by the first tool, in the absence of a preliminary step.

[0028] For clarity, identical or similar elements are identified by identical reference signs throughout the figures. Detailed description of embodiments

[0029] In [Fig. 1] is illustrated the mounting of a primary or secondary shaft 2 in a casing 10 of a gearbox or motor, in particular an electric motor, of a motor vehicle, said mounting being carried out by means of a bearing 12 comprising an outer ring 14, an inner ring 16 and rolling bodies 18 arranged between said rings 14 and 16 to allow their relative rotation. In the embodiment shown, the inner ring 16 is rotating and shrunk onto the shaft 2, the outer ring 14 is fixed and shrunk or mounted adjusted in a housing bottom 101 of a bore 3 of the casing 10. The rolling bodies 18 are here balls, but could also be, for example, conical or cylindrical rollers. The outer ring 14 comprises a groove 22 formed by a front bearing surface 17 of a first diameter and a rear bearing surface 19 of a second diameter strictly greater than the first diameter.The front bearing surface 17 forms a front flank 4 of the groove 22 and the rear bearing surface 19 forms a rear flank 5 of the groove 22, opposite the front flank 4. On the outer ring 14 is mounted a retaining flange 20 comprising a front face 201 facing away from the casing 10, and a rear face 202 facing the casing 10 and the rear flank 5 of the groove 22.

[0030] To mount the bearing 12 in the casing 10, the retaining flange 20 is assembled in the groove 22 of the bearing 12, by a method which will be described later. The assembly consisting of the retaining flange 20 and the bearing 12 is then shrink-fitted onto an axial end of the shaft 2. The subassembly consisting of the shaft 2, the bearing 12 and the retaining flange 20 is then positioned axially blind at the entrance to the bore 3 of the casing 10. To insert the outer ring 14 into the housing bottom 101 of the bore 3, by shrink-fitting or with clearance, screws 6 are used, which pass through the casing 10 and engage in mounting holes 28, which may be, for example, threaded holes. These screws 6, distributed around the circumference of the retaining flange 20, are gradually tightened to bring the retaining flange 20 closer to the casing 10 and create contact pressure between the outer ring 14 and the housing bottom 101 of the casing 10.In passing, it should be noted that the retaining flange 20. has, between the front face 201 and the rear face 202, a relatively large thickness, preferably larger than the width of the groove 22 between the front flank 4 and the rear flank 5, this to give the holding flange 20 a high stiffness, sufficient to transmit the assembly forces and support the forces transmitted by the shaft 2.

[0031] Figures 2a and 2b show the front face 201 and the rear face 202 of the retaining flange 20 respectively.

[0032] From the front face 201 of the retaining flange 20 to an intermediate depth less than the total thickness of the retaining flange 20 is formed a bore 25 having as its contour a geometric envelope 41 which will be called the front geometric envelope, centered on a reference axis 1 of the flange 20. From the intermediate thickness of the retaining flange 20 to its rear face 202 is formed a bore 24 called the final bore having as its contour a geometric envelope 43 which will be called the rear geometric envelope, centered on the reference axis 1 of the flange 20. A face 203 parallel to the front face 201 and to the rear face 202 of the retaining flange 20 connects the front geometric envelope 41 and the rear geometric envelope 43.

[0033] The front geometric envelope 41 is composed of two cylindrical portions 251, 252 diametrically opposed and separated by a holding notch 29 and an assembly notch 31, preferably diametrically opposed. The holding notch 29 has a U-shape in axial projection (see also FIGS. 4b and 5b), the width of the notch, measured in the radial direction, being less than its length, measured in the orthoradial direction. The assembly notch 31 also has, still in axial projection, a U-shape, the width of the assembly notch 31 being less than its length. The holding notch 29 and the assembly notch 31 project radially outwards from the holding flange 20.

[0034] The rear geometric envelope 43 is composed of two diametrically opposed cylindrical portions 241, 242 separated by two singularities 11 and 13, the rear geometric envelope 43 being of smaller dimensions than the front geometric envelope 41. The first singularity 11 is located radially in the extension of the holding notch 29 and the second singularity 13 is located radially in the extension of the assembly notch 31. Connection zones 9 connect the cylindrical portions 241, 242 and the first singularity 11 and connection zones 15 connect the cylindrical portions 241, 242 and the second singularity 15.The connection zones 9 extend radially outside the cylindrical portions 241, 242 of the rear geometric envelope 43 and axially over the thickness of the rear geometric envelope 43 or over the entire thickness of the holding flange 20; and the connection zones 15 extend radially outside the cylindrical portions 241, 242 of the rear geometric envelope 43 and axially over . the thickness of the rear geometric envelope 43 or over the entire thickness of the retaining flange 20. The connection zones 9 and 15 are in the form of material recesses, for example rounded recesses oriented radially towards the outside of the flange 20.

[0035] In the axial extension of the holding notch 29 and up to the rear face 202 of the holding flange 20 is formed a tab 33, and in the axial extension of the assembly notch 31 and up to the rear face 202 of the holding flange 20 is pierced a hole 310, preferably oblong, of dimensions smaller than those of the second notch 31. In the center of the edge of the oblong hole 310 which borders the rear geometric envelope 43, there is preferably a boss 27 oriented radially towards the outside of the holding flange 20. The thickness of material located between the rear geometric envelope 43 of the flange 20 and the hole 310 of the assembly notch 31 constitutes an assembly member 26, plastically deformable between a mounting state, as shown in Figures 2a and 2b, and a mounted state, in which the assembly member 26 moves radially towards the inside of the holding flange 20.

[0036] The outer contour of the retaining flange 20 is formed of cylindrical portions connected by fixing lugs 23 oriented radially towards the outside of the retaining flange 20. The mounting holes 28 are located in the center of the fixing lugs 23.

[0037] According to another embodiment not shown, the front geometric envelope 41 can be formed of more than two cylindrical portions separated by more than two notches, so that the holding flange 20 can comprise more than one assembly member 26, and / or more than one tab 33.

[0038] A method of assembling the retaining flange 20 around the outer ring 14 is described below. The retaining notch 29 is inserted into the groove 22 of the outer ring 14 by the relative inclination of the final bore 24 with respect to the front surface 17 of the groove 22 of the outer ring 14, in order to allow the tongue 33 to pass axially beyond said front surface 17. Then, the assembly method provides for radially deforming at least one assembly member 26 from the mounting state to the mounted state, to arrange the assembly member 26 at least partly in the groove 22, in order to ensure the assembly of the retaining flange 20 by interference between the groove 22, the tongue 33 and the assembly member 26.Thus, the assembly being carried out by deformation of the assembly member 26, the force to be applied to the holding flange 20 remains limited in order to be able to properly control the assembly interference between said holding flange 20 and the outer ring 14 of the bearing 12.

[0039] A method of manufacturing the flange 20 illustrated in the preceding figures will now be described. Figures 3a and 3b illustrate an optional preliminary step of the method of manufacturing the holding flange 20. A metal plate 37 is placed on a lower die of a mechanical or hydraulic press and is immobilized, using fixing means inserted into holding holes 21 drilled on the contour of the plate 37. A roughing punch 38, fixed on a tool holder, moves along its reference axis 1 and in a penetration direction A, and perforates the metal plate 37 until it reaches the bottom of the lower die to form the geometric roughing envelope 39. The roughing punch 38 has as its external shape a geometric roughing envelope 39 that is cylindrical and has a diameter smaller than the dimensions of the front geometric envelope 41. According to other embodiments not shown, the geometric roughing envelope 39 is of any shape and dimensions, for example formed of two diametrically opposed cylindrical portions separated by two diametrically opposed notches. opposite.The metal plate 37 is of known thickness, the thickness being greater than or equal to 3mm and less than or equal to 6mm. According to another embodiment, the holding holes 21 are drilled at the same time as the geometric roughing envelope 39.

[0040] In a first step proper of the method for manufacturing the holding flange 20, illustrated in FIGS. 4a and 4b, a first punch 40, fixed on a first tool holder, moves along the reference axis 1 and along the penetration direction A, and stamps the metal plate 37 to form a material recess having the contour of the front geometric envelope 41. [Fig. 4a] shows the first punch 40 partially stamping the plate 37 obtained after the step of [Fig. 3b] to an intermediate depth less than the thickness of the plate 37. More precisely, the intermediate depth is between 1 mm and 3 mm, or between one third of the total thickness of the plate 37 and two thirds of the total thickness of the plate 37. The first punch 40 has the outer shape of the front geometric envelope 41.The cylindrical portions 251, 252 of the front geometric envelope 41 are located radially outside the rough geometric envelope 39, the radial distance being greater than 1 mm, and preferably greater than 3 mm, and less than 10 mm, preferably less than 7 mm. In [Fig. 4b] is illustrated the metal plate 37 in which the recess obtained using the first punch 40 has been formed, according to the method described in [Fig. 4a]. During an additional step not shown, the material contained in the assembly notch 31 of the plate 37 is drilled or punched to form the oblong hole 310 and the assembly member 26. Furthermore, during this additional step, the mounting holes 28 are drilled or punched in the plate 37, radially at a distance from the front geometric envelope 41.

[0041] In a second step of the method of manufacturing the holding flange 20, illustrated in FIGS. 5a and 5b, a second punch 42, fixed on a second tool holder, moves along the reference axis 1, and perforates the metal plate 37 to form the rear geometric envelope 43. The second punch 42 makes a clean cut on at least a portion of the thickness of the plate 37, in particular on at least 0.5 mm of thickness from the face 203 and in the direction of penetration A. [Fig.5a] illustrates the second punch 42 perforating the plate 37 obtained after the step of [Fig.4a], along the reference axis 1 and in the direction of penetration A. The second punch 42 has the external shape of the rear geometric envelope 43. The cylindrical portions 251, 252 of the front geometric envelope 41 are located radially outside the rear geometric envelope 43, at a radial distance which is greater than 0.1 mm, and preferably greater than 0.5 mm, and less than 1.0 mm, preferably less than 0.7 mm. In [Fig.5b] is illustrated the metal plate 37 in which the rear geometric envelope 43 has been formed using the second punch 42, according to the method described in [Fig.5a].

[0042] In a subsequent step not shown, an outer contour of the plate is formed, the contour taking the form of cylindrical portions separated by fixing lugs 23 oriented radially outwards. The contour is generally located radially inside the holding holes 21 used to hold the plate 37 on the lower dies and radially outside the mounting holes 28.

[0043] In [Fig. 6] is shown a second two-step embodiment of the method for manufacturing the holding flange 20. In the first step, the metal plate 37 is placed on a hollow lower die 44 having a cavity for collecting material, the cavity having a depth greater than the axial distance between the intermediate thickness of the metal plate 37 and the rear face 202 of the metal plate 37. The hollow lower die has as its outline the geometric blank envelope 39.The first punch 40, fixed on a first tool holder, moves along the reference axis 1, and stamps the plate 37 to the intermediate depth by moving the material located inside the front geometric envelope 41 into the cavity of the lower hollow die in order to form a material recess on the intermediate thickness of the plate, the recess having as its outline the front geometric envelope 41, and a volume of material pushed back from the intermediate thickness of the plate 37 into the cavity of the lower hollow die, the volume of material having as its outline the rough geometric envelope 39.

[0044] During the second step of the second embodiment, similar to the previous embodiment, the second punch 42 having as its outline the rear geometric envelope 43, moves along the reference axis 1, and perforates the metal plate 37 to form the rear geometric envelope 43 of the metal plate 37 as shown in [Fig.5b].

[0045] According to another embodiment not illustrated, the three punches 38, 40, 42 are located on three tool holders belonging to three different presses.

[0046] Naturally, the examples shown in the figures and discussed above are given for illustrative purposes only and are not limiting. It is explicitly provided that the different embodiments illustrated can be combined with each other to propose others.

[0047] It is emphasized that all features, as they emerge for a person skilled in the art from the present description, the drawings and the attached claims, even if concretely they have only been described in relation to other determined features, both individually and in any combinations, can be combined with other features or groups of features disclosed herein, provided that this has not been expressly excluded or that technical circumstances make such combinations impossible or meaningless.

Claims

Claims

1. Method for manufacturing a retaining flange (20) intended to be inserted into a groove (22) of an outer ring (14) of a bearing (12), from a metal plate (37) having a plate thickness measured between a front face (201) and an opposite rear face (202) of the metal plate (37), the method being characterized in that it comprises at least the following two steps: - by penetration of a first tool (40), along a reference axis (1) perpendicular to the plate (37) and in a penetration direction (A) from the front face (201) over an intermediate depth less than the plate thickness (37), material initially located inside a front geometric envelope (41) is pushed into a volume located beyond the first tool (40) in the penetration direction (A) and delimited by a roughing geometric envelope (39), the roughing geometric envelope roughing (39) being located,in projection onto a plane perpendicular to the reference axis, inside the front geometric envelope (41), the front geometric envelope (41) comprising at least two cylindrical portions (251, 252) centered on the reference axis (1), separated by at least one holding notch (29) and one assembly notch (31) projecting radially opposite the reference axis (1) relative to the cylindrical portions (251, 252); - by penetration of a second tool (42) along the reference axis (1) and in the penetration direction (A), the plate (37) is perforated to form a final bore (24) having a rear geometric envelope (43) located, in projection onto a plane perpendicular to the reference axis (1), radially inside the front geometric envelope (41) and outside the roughing geometric envelope (39).,

2. Manufacturing method according to claim 1, characterized in that it contains a preliminary step in which a roughing tool (38) penetrates along the reference axis (1) in the penetration direction (A) from the front face (201), to perforate the plate (37) and form a hole roughing having as its outline the geometric roughing envelope (39) surrounding the reference axis (1).

3. Manufacturing method according to any one of the preceding claims, characterized in that the assembly notch (31) of the front geometric envelope (41) is perforated along the reference axis (1) to form a hole (310) and a plastically deformable assembly member (26) located between the hole (310) and the rear geometric envelope (43).

4. Manufacturing method according to any one of the preceding claims, characterized in that the rear geometric envelope (43) comprises cylindrical portions (241, 242) centered on the reference axis (1), two of the cylindrical portions (241, 242) being located on either side of a first singularity (11) of the rear geometric envelope (43), the first singularity (11) being located radially in the extension of the holding notch (29), to form a tongue (33) of thickness less than the thickness of the metal plate (37) projecting radially towards the reference axis (1) relative to the cylindrical portions (241, 242) of the rear geometric envelope (43).

5. Manufacturing method according to claim 4, characterized in that the first singularity (11) comprises connection zones (9) between the tongue (33) and the two cylindrical portions (241, 242) located on either side of the first singularity (11), the connection zones (9) extending radially outside the cylindrical portions (241, 242) located on either side of the first singularity (11).

6. Manufacturing method according to any one of claims 4 to 5, characterized in that the rear geometric envelope (43) comprises at least one second singularity (13) located between two adjacent cylindrical portions (241, 242) among the cylindrical portions of the rear geometric envelope (43), radially in the extension of the assembly notch (31), the second singularity (13) comprising connection zones (15) with the two adjacent cylindrical portions (241, 242), the connection zones (15) of the second singularity (13) extending: - radially outside the cylindrical portions (241, 242) of the rear geometric envelope (43) and axially over the thickness of the rear geometric envelope (43), or; - radially outside the cylindrical portions (241, 242) of the rear geometric envelope (43) and axially over the entire thickness of the retaining flange (20).

7. Manufacturing method according to any one of the preceding claims, characterized in that the front geometric envelope (41) comprises in all two diametrically opposed cylindrical portions (251, 252), and a holding notch (29) and an assembly notch (31) separating the two cylindrical portions (251, 252) of the front geometric envelope (41), the holding notch (29) and the assembly notch (31) being diametrically opposed.

8. Manufacturing method according to any one of the preceding claims, characterized in that the perforations are made by punching.

9. Manufacturing method according to any one of the preceding claims, characterized in that the material is embossed by stamping.

10. Manufacturing method according to any one of the preceding claims, characterized in that mounting holes (28) and holding holes (21) are cut out in the plate (37), radially outside the front geometric envelope (41) of the plate (37), the holding holes (21) serving to hold the plate (37) during the manufacturing steps.

11. Manufacturing method according to claim 10, characterized in that, at the end of manufacturing the plate (37), a contour of the plate (37) is cut out, surrounding the mounting holes (28) and located radially inside the holding holes (21).

12. Manufacturing method according to any one of the preceding claims, characterized in that: - the intermediate depth is greater than one third of the thickness of the plate (37), and / or - the intermediate depth is less than two thirds of the thickness of the plate (37), and / or - the difference between the thickness of the plate (37) and the intermediate depth is greater than 1 mm and less than 3 mm, and / or - the intermediate depth is greater than 1 mm is in- less than 3 mm, and / or - the thickness of the plate (37) is greater than 3 mm, for example 4 mm, and less than 6 mm.

13. Manufacturing method according to any one of the preceding claims, characterized in that the second tool (42) produces a sharp edge at the intermediate depth and a clean cut of the final bore (24) to a depth of at least 0.5 mm from the sharp edge in the penetration direction (A).

14. Manufacturing method according to any one of the preceding claims, characterized in that: - the cylindrical portions (251, 252) of the front geometric envelope (41) are located at a radial distance from the final bore (24) which is greater than 0.1 mm, and preferably greater than 0.5 mm, and less than 1.0 mm, preferably less than 0.7 mm; and / or - the cylindrical portions (251, 252) of the front geometric envelope (41) are located at a radial distance from the rough geometric envelope (39) which is greater than 1 mm, and preferably greater than 3 mm, and less than 10 mm, preferably less than 7 mm.

15. A method of manufacturing a rotational guide assembly intended to be mounted inside a casing (10), comprising manufacturing a retaining flange (20) according to any one of the preceding claims in combination with claim 3 and claim 4, and mounting the retaining flange (20) in a groove (22) of an outer ring (14) of a bearing (12), the groove (22) having a front bearing surface (17) having a first diameter and a rear bearing surface (19) having a second diameter greater than the first diameter, characterized in that the tongue (33) of the retaining flange (20) is inserted into the groove (22) of the outer ring (14) of the bearing (12) and in that the assembly member (26) is plastically deformed to insert it radially and at least partially into the groove (22), with a clearance greater than 0.1 mm between the deformed assembly member (26) and the bottom of the throat (22).

16. A rotation guide assembly intended to be mounted inside a casing (10), characterized in that it is obtained by the method of claim 15.

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