Bearing roller and its grinding tool and production method

Abstract

The invention discloses a roller (1) for a roller bearing, comprising two end faces (2, 4) and a rolling face (6). At least one of the end faces (2, 4) has an at least partially ground non-constant curvature profile (10).

Description

Technical Field

[0001] This invention relates to a roller (also called a "rolling element") for a roller bearing according to the preamble of claim 1. Furthermore, the invention also relates to an assembly comprising a grinding tool and a roller for a roller bearing, and a method for manufacturing the roller (for a roller bearing). Background Technology

[0002] Rollers in roller bearings typically have a straight profile on their end faces, meaning the end faces are neither concave nor convex. However, in some applications, this straight profile can lead to high friction and consequently, high temperatures. Furthermore, using flat-ground end faces (i.e., the end faces extending perpendicular to the roller axis) can result in unfavorable roller-edge contact, which can increase friction, wear, or bearing damage under axial loads. Moreover, rollers with a constant spherical curvature ground profile on their end faces are known to have the disadvantage that they must be manufactured with extreme precision to prevent dangerous operating conditions such as excessive edge loading or contact-ellipse truncation.

[0003] Therefore, the object of the present invention is to provide a roller with an improved end profile and enhanced axial load capacity. Summary of the Invention

[0004] The above objective is achieved by the bearing roller described in technical solution 1, the assembly comprising a grinding tool and a bearing roller described in technical solution 6, and the method for manufacturing the bearing roller described in technical solution 14.

[0005] The following describes bearing rollers used in rolling bearings. These rollers have two end faces and one rolling surface. To achieve lower friction under axial loads, at least one end face has at least partially ground a non-constant curvature profile. Roller bearings equipped with such rollers have particularly high axial load carrying capacity and can be used, for example, as wheelset bearings, drive bearings, traction motor bearings for rail vehicles, wind turbine bearings (commonly known as "wind turbine bearings"), and rolling mill bearings.

[0006] "Non-constant curvature" should be understood as the curvature of a curve whose radius of curvature is not constant but changes during the curve's progression. For example, the curvature of the curve extending from the starting point to the ending point of the face grinding profile can increase or decrease as the distance from the starting point increases.

[0007] According to a further exemplary embodiment, the curvature is determined along a curve extending radially. The curvature is preferably logarithmic, and / or the profile is a toroidal shape. End face profiles with logarithmic curvature and / or a toroidal shape profile can prevent edge overloading and reduce friction in the end-side contact of the roller bearing.

[0008] The rollers are, in particular, tapered rollers, and are accordingly used in tapered roller bearings. The end face having at least a partially ground profile preferably slides against the guide flange of the roller bearing. In the case where the tapered roller has a first end face with a larger diameter and a second end face with a smaller diameter, the end face with the larger diameter forms the guide flange sliding surface, and the end face with the smaller diameter forms the fixed flange sliding surface. As described above, at least the guide flange sliding surface is at least partially ground and has a non-constant curvature. The fixed flange sliding surface may have a straight, constant curvature, or non-constant curvature profile, and may be machined, for example, by grinding, hard turning, or any other manufacturing method.

[0009] Here, compared to other machining methods such as hard turning or eroding, grinding makes it possible to form profiles with non-constant curvature in a shorter machining time, thus enabling more efficient production of end face profiles. Furthermore, grinding can also provide smaller rolling elements with profiles of non-constant curvature. Moreover, the term "grinding profile" should be understood as a profile formed by grinding, the shape of which is fundamentally determined by grinding. In other words, "grinding profile" should not, in particular, be understood as a profile formed by other manufacturing methods, such as hard turning followed by surface finishing such as barrel finishing to eliminate irregularities.

[0010] The grinding profile is preferably formed in the transition region of the roller from the end face to the rolling surface. In particular, the profile on the end side, which is at least partially ground, can preferably be integrated into the profile formed on the rolling surface of the roller via an unground edge reduction. The friction generated by the roller against the retaining edge in the transition region from the end face to the rolling surface is thus reduced, thereby reducing frictional temperature rise and extending the service life of the roller and roller bearing. Furthermore, it is also beneficial if the rolling surface of the roller is ground. Starting from the edge reduction, the profile formed on the rolling surface of the roller preferably has a non-constant curvature. The curvature is preferably logarithmic curvature, and / or the profile is a toroidal profile.

[0011] According to a preferred exemplary embodiment, at the 0.9×R position, the profile has a pitch β (0.15° ≤ β ≤ 2.0°) between 0.15° and 2°, where R is the roller radius. This design advantageously allows the roller to tangentially abut against the bearing flange, particularly preventing edge overloading of the roller.

[0012] At the 0.88×R position, the profile height Y is preferably between 0.00007×R and 0.0020×R (i.e., 0.00007×R ≤ Y ≤ 0.0020×R). At the radial distance X position, the maximum profile height Z is preferably between 0.0002×R and 0.0065×R (i.e., 0.0002×R ≤ Z ≤ 0.0065×R). Here, "profile height" refers to the distance from the profile to a reference value on the roller axis or rotation axis. Using the above-described roller, the reference value is located at the 0.65×R position. The edge reduction region preferably begins at an X value between 0.8900×R and 0.9680×R (i.e., 0.8900×R ≤ X ≤ 0.9680×R) and ends at a C value between 0.9940×R and 0.9994×R (i.e., 0.9940×R ≤ C ≤ 0.9994×R). The track profile preferably follows the edge reduction region.

[0013] According to a further exemplary embodiment, the roller has at least one non-grinding surface region radially inward of the grinding surface. This non-grinding surface region may, for example, be configured as a recess within the grinding surface region, a so-called "dimple." This recess or dimple may, for example, be used to captively hold the roller on or within a cage during assembly. Alternatively, the non-grinding surface region may also be located radially outward of the grinding region, for example, in a transition region leading to the raceway, or at an edge location.

[0014] According to a further aspect, the present invention also provides an assembly for roller bearings, comprising a grinding tool and the rollers described above. The grinding tool and the rollers are rotatable / movable relative to each other. Here, the grinding tool is configured to form a grinding profile, and / or the grinding tool and the rollers are movable relative to each other, such that the grinding profile can be formed. For example, the grinding tool and the rollers may be tiltable relative to each other to form the grinding profile. As a further alternative, the grinding tool may also have a profile complementary to the profile to be formed on the rollers.

[0015] According to a further preferred exemplary embodiment, the grinding tool and the roller are arranged relative to each other such that they interact (or interact) along a substantially linear contact area. Here, the contact area substantially corresponds to the grinding area, and roughly speaking, the contact area forms a line along which the roller contacts the grinding tool. However, generally speaking, the contact area has a certain area. The smaller the area of ​​the contact area, the more accurately the grinding profile is constructed. For example, a flat profile can be obtained by rotating a radially extending curve with a non-constant curvature about a rotation axis. As the radially extending curve rotates about its rotation axis, a flat profile with a non-constant curvature in the radial direction is thus formed.

[0016] According to a further exemplary embodiment, the grinding tool rotates about an axis of rotation, and / or the roller rotates about an axis of rotation. In particular, the rotational directions of each axis of rotation are chosen such that counter-movement occurs within the contact area. Grinding efficiency, in this example, is thus improved.

[0017] Furthermore, the rotation axis of the grinding tool and the rotation axis of the roller can form an angle between 0° and 90°, particularly between 25° and 75°. Here, depending on the roller to be ground, the angle between the rotation axis of the grinding tool and the rotation axis of the roller is adjustable.

[0018] According to a further exemplary embodiment, the grinding tool has a truncated conical cross-sectional shape and includes a grinding surface formed on the outer surface of the truncated cone. In particular, the outer surface has the aforementioned complementary profile. In this way, the profile to be ground can be easily formed on the roller.

[0019] The grinding surface on the truncated cone preferably has a larger first diameter and a smaller second diameter. The grinding tool is arranged on the roller such that the larger first diameter of the grinding surface contacts the radially inner side of the roller (i.e., at the position of the smaller diameter of the roller), and the smaller second diameter of the grinding surface contacts the radially outer side of the roller (i.e., at the position of the larger diameter of the roller). By employing counter-rotation between the roller and the grinding tool, the rotational speed of the smaller diameter of the roller can be matched with the rotational speed of the larger diameter of the grinding tool, thereby minimizing the relative speed difference, especially in the contact area.

[0020] According to a further embodiment, the grinding surface includes a coating made of a nickel matrix comprising embedded abrasive particles, particularly cubic boron nitride (also known as "CBN") and / or diamond (abrasive particles). The crystal size (or grain size) of the abrasive particles falls between 20 and 100 μm. The crystal size is preferably between 50 ± 20 μm, more preferably between 46 ± 2 μm. Furthermore, the grinding tool may also include a basebody on which the coating is formed. In particular, the basebody may be formed of a metal (e.g., steel). The basebody is preferably very hard, preferably having a Young's modulus exceeding 100 GPa.

[0021] CBN, or cubic boron nitride, is the second hardest known material after diamond. Diamond is composed of pure carbon in a tight three-dimensional matrix; while CBN has the same three-dimensional matrix, it is composed of boron and nitrogen atoms. Due to its complex atomic structure, CBN has a greater number of crystal shapes than, for example, diamond. Possible crystal shapes range from octahedral to cubic, and even from octahedral to tetrahedral. Furthermore, CBN has high thermal conductivity, low coefficient of friction, and a specific gravity of 3.48 g / cm³. 3 .

[0022] The increasing use of more wear-resistant and therefore difficult-to-machine steel alloys, coupled with the dual demands for improved performance and quality, has led to further development on both the machine and grinding wheel sides. In materials to be processed, once the alloying additives are converted to carbide form, as is the case with powder metallurgy steel, traditional abrasives such as corundum (Al2O3) quickly reach their performance limits (Knoop hardness 2200), making CBN with a Knoop hardness of 4500 a more suitable choice. Furthermore, CBN has superior thermal conductivity compared to Al2O3, resulting in better cooled grinding performance.

[0023] Depending on the material being ground, CBN has another advantage: unlike diamond, it does not contain carbon. Carbon diffuses into the material being ground, especially steel alloys, thus altering the material's properties. CBN offers a long service life and excellent material removal rates, making it primarily suitable for applications with typically short grinding cycles and fully automated production processes. In particular, powder metallurgy or high-alloy tool steels are often no longer economically viable for grinding with traditional abrasives.

[0024] In a further embodiment, the embedded abrasive particles are crushed. In grinding technology, "crushing" (or "breaking") should be understood as breaking the grain tips to improve dimensional accuracy and grinding performance. This is achieved by using a hard metal roller, through rotation and path control, traversing a grinding surface that rotates at the same circumferential speed, breaking up protruding grain tips that deviate from the contour line, thus achieving a precise dimension. During this process, the relative speed between the circumferential speeds of the hard metal roller and the grinding surface should be as low as possible. Crushed abrasive particles, in particular, enable grinding with high-precision contours and high surface quality. Alternatively, the embedded abrasive particles may not be crushed.

[0025] According to a further aspect, the present invention also provides a method for producing rollers for the roller bearings described above, the method particularly employing the combination described above.

[0026] In particular, the method includes the following steps:

[0027] a. Providing rollers for roller bearings, said rollers comprising two end faces and a rolling surface, said rollers having specified dimensional dimensions; and

[0028] b. Grind at least one end face of the roller with a grinding tool, such that the at least one end face has a non-constant curvature profile with at least partial grinding.

[0029] In particular, the roller may have a dimension corresponding to its length. "Roller length" should be understood as the length of the roller between its two end faces along the axis of rotation. This dimension, for example, may be 1 to 4 times the desired profile height. Here, the profile height corresponds to the axial extension of the grinding profile along the roller's axis of rotation. The height at the axis of rotation position may be smaller than its dimension at the transition position to the rolling surface. For example, the height may be 30 μm at the roller's center and 50 μm at the transition position to the rolling surface.

[0030] Here, the provided roller may have a pre-existing basic shape. For example, the roller may have a conical shape, a cylindrical shape, or a similar shape. The basic shape may be formed from a blank by casting and / or machining.

[0031] The provided rollers are preferably hardened and have two end faces and / or rolling surfaces. Furthermore, the provided rollers can be pre-ground and / or hard-turned prior to end face profile grinding. This operation may be advantageous to provide a flat surface. For example, during subsequent end face profile grinding, the provided dimensions can be partially and / or completely ground away to obtain the end profile.

[0032] The end face is preferably ground before the rolling face. For example, a pre-ground roller can first be given the desired end face profile, and after the grinding process that forms the end face profile, a final processing for surface finishing purposes can be performed, such as polishing, honing, lapping and / or surface finishing, as well as grinding of the rolling face.

[0033] According to a further embodiment, the method includes machining a recess or pit in the region of the roller's axis of rotation, wherein the recess has a predetermined diameter. The recess is preferably formed before the end face is ground. For example, the predetermined diameter of the recess may depend on the diameter of the roller. The diameter of the recess is preferably less than 0.65 times the diameter of the roller. This allows the roller to be flexibly held on the cage during assembly.

[0034] Further advantages and beneficial embodiments of the invention will be set forth in the specification, drawings, and claims. Here, in particular, the combinations of features depicted in the specification and drawings are purely exemplary in nature; these features may exist individually or in other combinations.

[0035] The present invention will now be described in detail with reference to the exemplary embodiments shown in the accompanying drawings. These exemplary embodiments and the combinations of features shown therein are purely illustrative and not intended to limit the scope of the invention. The scope of the invention is defined only by the appended claims. Attached Figure Description

[0036] Figure 1 This shows a roller for use in a roller bearing according to one embodiment;

[0037] Figure 2 show Figure 1 Enlarged view of the middle roller in region A;

[0038] Figure 3 The image shows an assembly comprising a grinding tool and a bearing roller according to a further embodiment;

[0039] Figure 4 for Figure 3 A magnified view of the combined structure in region X; and

[0040] Figure 5 show Figure 1 A schematic diagram of the grinding profile of the intermediate roller.

[0041] Explanation of reference numerals in the attached figures

[0042] 1 Roller

[0043] 2, 4 end faces

[0044] 6 Rolling surface

[0045] 8. Rotation axis

[0046] 10 Grinding profile

[0047] 12. Depression

[0048] 14 Transition Zone

[0049] 20 Assemblies

[0050] 22 Grinding tools

[0051] 24. Rotation axis

[0052] 26 Grinding surface

[0053] Diameters D1 and D2

[0054] Roller radii r1 and r2

[0055] Z Maximum profile height

[0056] Y-profile height

[0057] X is the starting point of the transition region.

[0058] C. End of the transition region Detailed Implementation

[0059] In the following text, identical or functionally equivalent parts are given the same reference numerals.

[0060] Figure 1 Roller 1 for a roller bearing is shown. In the illustrated exemplary embodiment, roller 1 is constructed as a tapered roller for a tapered roller bearing. Figure 2 The area A shown is on the profile of one end face 2 of the roller 1. Alternatively, the roller can also have other shapes, such as cylindrical. The roller 1 has two end faces 2 and 4 and a rolling surface 6, and the roller 1 is configured to rotate about the axis of rotation 8. Here, in the case of the tapered roller shown, end face 4 has a smaller diameter and end face 2 has a larger diameter. In particular, end face 4 slides against the guide flange (not shown) of the bearing, while end face 2 can contact the retaining flange (not shown) of the bearing.

[0061] To achieve low friction under axial loads and thus prevent excessive edge loading, the end face 2 has a profile 10 that is at least partially ground. Figure 2 In the image, the grinding profile 10 is shown as a shaded surface. Profile 10 has a non-constant curvature, defined by a curve extending radially, for example, a logarithmic curvature. Alternatively, the grinding profile 10 may have a torus shape. The grinding profile is formed, for example, up to the transition region 14 of the roller 1 from the end face 2 to the rolling surface 6. In particular, the transition region 14 may preferably be constructed as an unground edge recessed region that merges into the profile formed by the roller 1 on the rolling surface 6. Furthermore, starting from the edge recess, the profile formed on the rolling surface 6 of the roller 1 may also have a non-constant curvature. For example, the profile of the rolling surface 6 of the roller 1 may have a logarithmic curvature and / or be constructed as a torus-shaped profile.

[0062] Figure 5 This is a schematic diagram depicting the grinding profile. The roller radius R is drawn on the X-axis, and the axis of rotation is drawn on the Y-axis. R is half the roller radius or roller diameter. At the 0.9×R position, the grinding profile 10, with its non-constant curvature, has a pitch β between 0.15° and 2° (0.15°≤β≤2.0°). This design advantageously achieves tangential abutment between the roller 1 and the roller bearing flange, thereby particularly preventing overloading of the roller 1's edge.

[0063] Furthermore, at the 0.88×R position of profile 10, the profile height Y is preferably between 0.00007×R and 0.0020×R (i.e., 0.00007×R ≤ Y ≤ 0.0020×R). The profile height is the distance from the profile to a reference value on the rotation axis 8 of the roller 1. For the roller described above, this reference value is located at the 0.65×R position. At the radial distance X position, the maximum profile height Z is between 0.0002×R and 0.0065×R (i.e., 0.0002×R ≤ Z ≤ 0.0065×R).

[0064] Furthermore, the transition region 14 or edge indentation region of roller 1 begins at an X value between 0.8900×R and 0.9680×R (i.e., 0.8900×R≤X≤0.9680×R) and ends at a C value between 0.9940×R and 0.9994×R (i.e., 0.9940×R≤C≤0.9994×R).

[0065] also, Figure 1 and 2 The diagram also shows a recess 12 on the end face 2 in the region of the axis of rotation 8. In the illustrated exemplary embodiment, the recess 12 is constructed as a non-grinding surface region, thereby forming at least one non-grinding surface region radially inward of the grinding surface. The recess 12 can be used, for example, to restrictively hold the roller 1 on or within a cage (not shown) during assembly. As an additional or alternative option, the recess 12 can also be formed as being ground, and / or a non-grinding surface region can be provided radially outward of the grinding surface, i.e., outside the grinding profile 10 (e.g., in the transition region 14 leading to the rolling surface 6).

[0066] Figure 3 The image shows an assembly 20 comprising a grinding tool 22 and a bearing roller 1. Figure 3 The roller 1 shown is constructed as a cylindrical roller. Figure 4 This shows a magnified view of the X region of the assembly.

[0067] The grinding tool 22 has a rotation axis 24, and the roller 1 has a rotation axis 8. The grinding tool 22 and the roller 1 are capable of rotating relative to each other about their respective rotation axes 8 and 24. Furthermore, the grinding tool 22 and the roller 1 are also capable of moving relative to each other. The rotation directions of the rotation axes 8 and 24 are preferably selected to enable the contact surfaces of the grinding tool 22 and the roller 1 to perform opposite movements.

[0068] The rotation axis 24 of the grinding tool 22 and the rotation axis 8 of the roller 1 form an angle α between 0° and 90°, particularly between 25° and 75°. Furthermore, depending on the roller to be ground, the angle α between the rotation axis 24 of the grinding tool 22 and the rotation axis 8 of the roller 1 can be adjusted.

[0069] In the illustrated exemplary embodiment, the grinding tool 20 has a truncated conical cross-sectional shape and includes a grinding surface 26 formed on the outer surface of the truncated cone. The grinding surface 26 has a coating made of nickel matrix, in which abrasive particles made of cubic boron nitride (also known as "CBN") are embedded. The crystal size (also known as "grain size") of the abrasive particles ranges between 20 and 100 μm, preferably between 50 ± 20 μm, and most preferably between 46 ± 2 μm. Alternatively, the grinding surface 26 may also embed abrasive particles made of diamond. Furthermore, the grinding tool may also include a base body (not shown) on which the coating is formed. In particular, the base body may be formed of a metal (e.g., steel). The base body is preferably very hard, preferably having a Young's modulus exceeding 100 GPa.

[0070] To form the grinding profile 10, the grinding surface 26 is configured to have a profile complementary to the profile to be formed. Here, the grinding surface 26 on the truncated cone has a larger first diameter D1 and a smaller second diameter D2. Furthermore, the grinding tool 22 on the roller 1 is configured such that the first diameter D1 contacts the roller 1 at a radius r1 position located radially inward, and the second diameter D2 contacts the roller at a radius r2 position located radially outward (see...). Figure 4 ).

[0071] To ensure that the larger first diameter D1 contacts the radially inner side of the roller (i.e., at the roller radius r1) and the smaller second diameter D2 contacts the radially outer side of the roller (i.e., at the larger roller radius r2), by having the roller 1 and the grinding tool 22 rotate in opposite directions, the relative rotational speeds at the smaller radius r1 of the roller and the larger diameter D1 of the grinding tool, or at the larger radius r2 of the roller and the smaller diameter D2 of the grinding tool, can be matched. This minimizes the speed difference along the contact area and reduces the relative rotational speed. This minimizes frictional heat generation during the grinding process. Here, the contact area between the grinding tool 22 and the roller 1 essentially corresponds to the grinding area. The smaller the surface area of ​​the contact area, the more accurate the grinding profile design.

[0072] In summary, the present invention provides a roller for roller bearings comprising a ground end profile. This end profile exhibits lower friction under axial load, thereby resulting in a higher axial load-carrying capacity. Here, grinding, in particular, enables shorter machining times and more efficient production of the end profile compared to other machining methods such as hard turning. Furthermore, the present invention can also provide small-sized rolling elements with arbitrary curved profiles, thereby ensuring improved sliding friction and the resulting increase in the axial load-carrying capacity of the rolling element.

Claims

1. A roller (1) for a roller bearing, comprising two end faces (2, 4) and a rolling surface (6), characterized in that, At least one end face (2, 4) has at least a locally ground profile (10) which has a non-constant curvature, at a 0.9 x R position, the profile (10) has a slope β of between 0.15° and 2°, i.e. where R is the radius of the roller, and / or At 0.88 x R position, the profile height Y is between 0.00007 x R and 0.0020 x R, i.e. .

2. A roller (1) for a roller bearing according to claim 1, characterized in that The grinding profile (10) is formed in the transition region (14) from the end face (2, 4) to the rolling surface (6).

3. A roller (1) for a roller bearing according to claim 1 or 2, characterized in that The curvature is determined along a curve extending radially.

4. The roller (1) for a roller bearing according to claim 1 or 2, characterized in that, The curvature is logarithmic curvature, and / or the profile is a toroidal profile.

5. The roller (1) for a roller bearing according to claim 1 or 2, characterized in that, The roller (1) includes at least one non-grinding surface area (12) on the radially inner side of the grinding surface.

6. The roller (1) for a roller bearing according to claim 2, characterized in that, At least a partial grinding profile (10) of the end faces (2, 4) is incorporated into the profile of the roller (1) formed on the rolling surface (6).

7. The roller (1) for a roller bearing according to claim 2, characterized in that, At least a partial grinding profile (10) of the end faces (2, 4) is incorporated into the profile of the roller (1) formed on the rolling surface (6) by non-grinding edge indentation.

8. An assembly (20) comprising a grinding tool (22) and a roller (1) for a roller bearing according to any one of claims 1 to 7, characterized in that, The grinding tool (22) and the roller (1) are capable of rotating / moving relative to each other, the grinding tool (22) is configured to form the at least partial grinding profile (10), and / or the grinding tool (22) and the roller (1) are capable of moving relative to each other so that the at least partial grinding profile (10) can be formed.

9. The assembly (20) according to claim 8, characterized in that, The grinding tool (22) has a profile that is complementary to the profile (10) to be formed on the roller (1).

10. The assembly (20) according to claim 8 or 9, characterized in that, The grinding tool (22) and the roller (1) are configured to interact with each other such that they interact approximately along a linear contact area.

11. The assembly (20) according to claim 10, characterized in that, The grinding tool (22) rotates about the axis of rotation (24), and / or the roller (1) rotates about the axis of rotation (8).

12. The assembly (20) according to claim 9, characterized in that, The grinding tool (22) has a truncated conical cross-sectional shape and further includes a grinding surface (26) formed on the outer surface of the truncated cone.

13. The assembly (20) according to claim 12, characterized in that, The grinding surface (26) on the truncated cone has a larger first diameter (D1) and a smaller second diameter (D2), and the grinding tool is arranged on the roller such that the first diameter (D1) contacts the radially inner side of the roller and the second diameter (D2) contacts the radially outer side of the roller.

14. The assembly (20) according to claim 12 or 13, characterized in that, The grinding surface (26) comprises a coating made of nickel matrix, in which abrasive particles are embedded, the grain size of which is in the range of 20 to 100 μm.

15. The assembly (20) according to claim 11, characterized in that, The rotational directions of these axes are chosen such that the motion occurring within the contact area is in the opposite direction.

16. The assembly (20) according to claim 11, characterized in that, The rotation axis (24) of the grinding tool (22) forms an angle (α) between 0° and 90° with the rotation axis (8) of the roller (1).

17. The assembly (20) according to claim 11, characterized in that, The rotation axis (24) of the grinding tool (22) forms an angle (α) between 25° and 75° with the rotation axis (8) of the roller (1).

18. The assembly (20) according to claim 12, characterized in that, The outer surface has the aforementioned complementary profile.

19. The assembly (20) according to claim 14, characterized in that, The abrasive particles are cubic boron nitride and / or diamond.

20. A method for manufacturing rollers, for manufacturing rollers (1) for roller bearings as described in any one of claims 1 to 7.

21. The method for manufacturing a roller according to claim 20, characterized in that, The combination (20) described in any one of claims 8 to 19 is adopted.

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