CN114749878B - Bearing outer ring machining method - Google Patents
Bearing outer ring machining method Download PDFInfo
- Publication number
- CN114749878B CN114749878B CN202210613935.1A CN202210613935A CN114749878B CN 114749878 B CN114749878 B CN 114749878B CN 202210613935 A CN202210613935 A CN 202210613935A CN 114749878 B CN114749878 B CN 114749878B
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- CN
- China
- Prior art keywords
- body part
- outer ring
- bearing outer
- end surface
- annular bulge
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims description 17
- 238000003754 machining Methods 0.000 title claims description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 46
- 230000002093 peripheral effect Effects 0.000 claims abstract description 24
- 238000003672 processing method Methods 0.000 claims abstract description 5
- 238000005255 carburizing Methods 0.000 claims description 9
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/003—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass bearings
Abstract
The invention relates to a processing method of a bearing outer ring, which comprises the following steps: turning the bearing outer ring before heat treatment, wherein the turned bearing outer ring comprises a body part and a bulge part, the inner peripheral surface of the body part is a conical surface, the outer peripheral surface of the body part is a cylindrical surface, the bulge part is an annular bulge which is arranged on the outer peripheral surface of the body part and extends from one side of a narrow end surface to one side of a wide end surface, the annular bulge comprises a bottom surface and a side surface, the bottom surface of the annular bulge extends outwards from the outer edge of the narrow end surface of the body part, and the side surface of the annular bulge extends from the outer edge of the bottom surface of the annular bulge to one side of the wide end surface of the body part in an inclined manner and is intersected with the outer peripheral surface of the body part. The convex bulge is arranged on one side of the bearing outer ring, which is close to the narrow end surface, so as to resist deflection of the bearing outer ring at the narrow end surface after heat treatment, and the shape of the inclined rollaway nest on the bearing outer ring after heat treatment is basically consistent with the inclination angle of the finished rollaway nest.
Description
Technical Field
The invention relates to the technical field of bearings, in particular to a method for processing an outer ring of a bearing.
Background
As shown in fig. 1, in the prior art, when carburizing a bearing outer ring provided with an inclined raceway, a certain amount of clearance is reserved for an inner diameter dimension corresponding to an inclined raceway surface on an inner circumferential surface of the bearing outer ring according to a contact angle, and a certain amount of clearance is reserved for a width direction correspondingly as is the outer diameter dimension corresponding to an outer circumferential surface of the bearing outer ring. As shown in figure 2, after the heat treatment according to the above allowance, the heat treatment warpage occurs, the raceway position is large in deformation, the angle of the outer ring of the bearing is unreasonable, the narrow end face of the outer ring of the whole bearing is upward warped, the top type after the heat treatment is needed, the top type can cause the concentration of internal stress, the depth of a carburized layer is inconsistent after the grinding processing, and the depth and the hardness of the raceway carburized layer on the inner circumferential surface of the outer ring are not in accordance with the quality requirement.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a processing method of a bearing outer ring, so as to solve the problem of large deformation of the bearing outer ring in carburizing.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a processing method of a bearing outer ring comprises the following steps: turning the bearing outer ring before heat treatment, wherein the turned bearing outer ring comprises a body part and a bulge part, the inner peripheral surface of the body part is a conical surface, the outer peripheral surface of the body part is a cylindrical surface, the bulge part is an annular bulge which is arranged on the outer peripheral surface of the body part and extends from one side of a narrow end surface to one side of a wide end surface, the annular bulge comprises a bottom surface and a side surface, the bottom surface of the annular bulge extends outwards from the outer edge of the narrow end surface of the body part, and the side surface of the annular bulge extends from the outer edge of the bottom surface of the annular bulge to one side of the wide end surface of the body part in an inclined manner and is intersected with the outer peripheral surface of the body part.
Further, the bottom surface of the annular projection extends radially outwardly from the outer edge of the narrow end surface of the body portion.
Further, the outer contour of the radial section of the annular bulge is circular.
Further, an axial cross-sectional profile of a side surface of the annular projection is parallel to an axial cross-sectional profile of an inner peripheral surface of the body portion.
Further, the axial dimension of the annular projection is between one half and one third of the axial dimension of the body portion.
Further, the method also comprises the following steps: and carburizing the turned bearing outer ring.
Further, the method also comprises the following steps: turning the raised part after carburization treatment.
Further, the method also comprises the following steps: and grinding the body part.
Further, the grinding processing of the body part comprises the following steps: grinding the inner peripheral surface of the body portion and the outer peripheral surface of the body portion.
Further, the inner conical surface before the heat treatment of the body part has a larger amount of the inner conical surface near the narrow end surface than the wide end surface.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a processing method of a bearing outer ring, which comprises the following steps: turning the bearing outer ring before heat treatment, wherein the turned bearing outer ring comprises a body part and a bulge part, the inner peripheral surface of the body part is a conical surface, the outer peripheral surface of the body part is a cylindrical surface, the bulge part is an annular bulge which is arranged on the outer peripheral surface of the body part and extends from one side of a narrow end surface to one side of a wide end surface, the annular bulge comprises a bottom surface and a side surface, the bottom surface of the annular bulge extends outwards from the outer edge of the narrow end surface of the body part, and the side surface of the annular bulge extends from the outer edge of the bottom surface of the annular bulge to one side of the wide end surface of the body part in an inclined manner and is intersected with the outer peripheral surface of the body part. The convex bulge is arranged on one side of the bearing outer ring, which is close to the narrow end surface, so as to resist deflection of the bearing outer ring at the narrow end surface after heat treatment, and the shape of the inclined rollaway nest on the bearing outer ring after heat treatment is basically consistent with the inclination angle of the finished rollaway nest.
Drawings
FIG. 1 is a schematic view of a prior art structure of a bearing outer race prior to carburization;
FIG. 2 is a schematic view of a prior art carburized bearing outer race;
fig. 3 is a schematic view of the structure of the outer ring of the bearing before carburizing treatment in the present embodiment;
fig. 4 is a schematic structural diagram of the carburized outer ring of the bearing according to the present embodiment.
In the figure: 1. the contour before heat treatment of the bearing outer ring in the prior art, 2, the actual contour after the processing of the bearing outer ring is finished, 2.1, a rollaway nest, 3, the contour after heat treatment of the bearing outer ring in the prior art, 4, a body part, 4.1, the contour before heat treatment of the body part, 4.2, the contour after heat treatment of the body part, 5, a narrow end face, 6, an annular bulge, 6.1, the bottom surface of the annular bulge, 6.2, the side surface of the annular bulge, 6.3, the contour of the annular bulge before heat treatment, and 6.4, the contour of the annular boss after heat treatment.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Example 1
As can be seen from a comparison between fig. 1 and fig. 2, the profile 1 before the heat treatment of the bearing outer ring in the prior art is deformed into the profile 3 after the heat treatment of the bearing outer ring in the prior art after carburization treatment, wherein the profile 3 after the heat treatment of the bearing outer ring in the prior art generates a great deflection deformation at the narrow end surface 5 of the bearing outer ring relative to the actual profile 2 after the processing of the bearing outer ring.
In order to solve the above-mentioned problems, the present embodiment provides a method for processing an outer ring of a bearing, which includes the steps of: turning the bearing outer ring before heat treatment, as shown in fig. 2-3, the turned bearing outer ring comprises a body part 4 and a bulge part, the inner circumferential surface of the body part 4 is a conical surface, the outer circumferential surface of the body part 4 is a cylindrical surface, the bulge part is an annular bulge 6 which is arranged on the outer circumferential surface of the body part 4 and extends from one side of a narrow end surface to one side of a wide end surface, the annular bulge 6 comprises a bottom surface and a side surface, the bottom surface 6.1 of the annular bulge extends outwards from the outer edge of the narrow end surface of the body part 4, and the side surface 6.2 of the annular bulge extends obliquely from the outer edge of the bottom surface 6.1 of the annular bulge to one side of the wide end surface of the body part 4 and is intersected with the outer circumferential surface of the body part 4.
The convex portion on the bearing outer ring after the turning of the shaft in this embodiment is provided outside the narrow end face side of the main body portion 4, that is, in the same direction as the deflection direction of the narrow end face of the main body portion 4 after the heat treatment. As can be seen from comparison between fig. 3 and fig. 4, in this embodiment, the deformation of the profile 4.1 before heat treatment and the profile 6.3 of the annular protrusion before heat treatment of the body portion 4 after carburization treatment is small, that is, the deformation amount between the profile 4.2 after heat treatment and the profile 6.4 of the annular protrusion after heat treatment of the body portion 4 relative to the actual profile 2 after finishing the processing of the outer ring of the bearing is small, and the design requirement can be satisfied. That is, the arrangement of the protruding portion of the embodiment reduces the deflection deformation of the narrow end face of the bearing outer ring after heat treatment, ensures that the deflection deformation of the narrow end face of the body 4 after heat treatment is within the range of design requirements, does not need secondary shaping treatment after heat treatment, and improves the quality and precision of products.
Preferably, the bottom surface 6.1 of the annular projection in this embodiment extends radially outwardly from the outer edge of the narrow end surface of the body portion 4. I.e. the bottom surface 6.1 of the annular projection is coplanar with the narrow end surface of the body portion 4. In another embodiment, the bottom surface 6.1 of the annular protrusion and the narrow end surface of the body portion 4 may not be coplanar, for example, the bottom surface 6.1 of the annular protrusion may be disposed obliquely to the left or right with respect to the narrow end surface of the body portion 4.
The outer contour of the radial cross section of the annular projection 6 in this embodiment is circular. I.e. the annular protrusion 6 in this embodiment is frusto-conical. It should be noted that the axial dimension of the annular protrusion 6 having a frustum shape and the taper thereof may be selected according to actual conditions.
In order to enhance the effect of the boss against the deflection deformation generated after heat treatment of the narrow end face of the bearing outer ring, the axial cross-sectional profile line of the side face 6.2 of the annular boss in this embodiment is parallel to the axial cross-sectional profile line of the inner peripheral face of the body portion 4, that is, the taper of the annular boss 6 is the same as the taper of the inner conical face of the body portion 4.
The axial dimension of the annular projection 6 of the present embodiment is controlled between one half and one third of the axial dimension of the body portion 4. Preferably, the axial dimension of the annular projection 6 is one third of the axial dimension of the body portion 4.
It should be noted that, by controlling the axial dimension of the annular protrusion 6 between one half and one third of the axial dimension of the body portion 4, the taper of the inner taper surface of the bearing outer ring body portion after heat treatment is approximately consistent with the taper of the actual raceway 2.1 after the processing of the bearing outer ring is completed, so that the consistency of the thickness of the carburized layer of the whole actual raceway 2.1 after grinding is ensured.
The step of this embodiment further includes carburizing the bearing outer ring after turning forming, specifically including carburizing the outer peripheral surface of the body portion 4, the outer peripheral surface of the protruding portion, and the inner conical surface of the body portion 4, to obtain a hardening layer with a certain thickness and hardness; turning out a protruding part of the outer ring of the bearing after carburizing treatment; the body portion 4 is then subjected to grinding, specifically, the body portion 4 is ground to obtain an inner peripheral surface and an outer peripheral surface of the body portion 4.
In this embodiment, the inner peripheral surface of the body 4 is heat treated and then ground to form the final raceway 2.1 of the bearing outer ring product.
In this embodiment, the protrusion is disposed on the bearing outer ring before heat treatment to resist the deflection deformation generated by heat treatment at the narrow end face of the bearing outer ring, so that the shape of the raceway after heat treatment is basically consistent with the angle of the finished raceway 2.1, and the carburized layer is consistent. In this embodiment, after the heat treatment of the protruding portion is needed to be removed, although the carburized layer and the hardness of the position where the protruding portion is located are not good after the protruding portion is removed, the situation that the hardness of the protruding portion on the outer circumferential surface of the outer ring of the bearing is not good does not affect the use from the application point of view because the main fatigue points in the use process of the bearing are the roller path and the roller.
The bearing outer ring subjected to heat treatment in the steps above may also undergo small deflection towards the outer diameter at the narrow end face, and at this time, the problem can be solved by the following method: the inner conical surface side of the body part before heat treatment is larger than the inner conical surface side of the body part before heat treatment close to the narrow end face, namely the taper of the inner conical surface of the body part before heat treatment is smaller than the taper of the inner conical surface (rollaway nest 2.1) of the actual profile of the bearing outer ring after the processing is completed. The internal taper angle of the body part after heat treatment is consistent with the angle of the internal taper hole of the finished product by increasing the allowance of the internal taper surface of the body part near one side of the narrow end surface before heat treatment.
Compared with the prior art, the embodiment has the beneficial effects that:
according to the embodiment, the bulge is arranged on the bearing outer ring before heat treatment to resist deflection deformation generated after carburizing heat treatment at the narrow end face of the bearing outer ring, so that the angle of the bearing outer ring raceway after heat treatment is basically consistent with the angle of the finished bearing outer ring raceway 2.1, the carburized layer is consistent, subsequent grinding processing of the bearing outer ring raceway surface is facilitated, and finally the quality and the precision of a product are guaranteed.
In the description of the present invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "another end," "upper," "one side," "top," "inner," "front," "center," "two ends," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (3)
1. The processing method of the bearing outer ring is characterized by comprising the following steps of: turning the bearing outer ring before heat treatment, wherein the turned bearing outer ring comprises a body part and a bulge part, the inner circumferential surface of the body part is a conical surface, the outer circumferential surface of the body part is a cylindrical surface, the bulge part is an annular bulge which is arranged on the outer circumferential surface of the body part and extends from one side of a narrow end surface to one side of a wide end surface, the annular bulge comprises a bottom surface and a side surface, the bottom surface of the annular bulge extends outwards from the outer edge of the narrow end surface of the body part, and the side surface of the annular bulge extends obliquely from the outer edge of the bottom surface of the annular bulge to one side of the wide end surface of the body part and is intersected with the outer circumferential surface of the body part; the bottom surface of the annular bulge extends outwards along the radial direction from the outer edge of the narrow end surface of the body part; the outer contour of the radial section of the annular bulge is circular; the axial section contour line of the side surface of the annular bulge is parallel to the axial section contour line of the inner peripheral surface of the body part; the axial dimension of the annular projection is between one half and one third of the axial dimension of the body portion; carburizing the turned bearing outer ring; turning a raised part after carburization treatment; and grinding the body part.
2. The method for machining the outer ring of the bearing according to claim 1, wherein: the grinding processing of the body part comprises the following steps: the inner peripheral surface of the body portion and the outer peripheral surface of the body portion are ground.
3. The method for machining the outer ring of the bearing according to claim 1, wherein: the inner conical surface before heat treatment of the body part has a larger amount of the inner conical surface near the narrow end surface than the inner conical surface near the wide end surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210613935.1A CN114749878B (en) | 2022-06-01 | 2022-06-01 | Bearing outer ring machining method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210613935.1A CN114749878B (en) | 2022-06-01 | 2022-06-01 | Bearing outer ring machining method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114749878A CN114749878A (en) | 2022-07-15 |
| CN114749878B true CN114749878B (en) | 2024-01-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210613935.1A Active CN114749878B (en) | 2022-06-01 | 2022-06-01 | Bearing outer ring machining method |
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| CN114749878A (en) | 2022-07-15 |
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