CN114749878A - Bearing outer ring machining method - Google Patents
Bearing outer ring machining method Download PDFInfo
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- CN114749878A CN114749878A CN202210613935.1A CN202210613935A CN114749878A CN 114749878 A CN114749878 A CN 114749878A CN 202210613935 A CN202210613935 A CN 202210613935A CN 114749878 A CN114749878 A CN 114749878A
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- outer ring
- bearing outer
- body part
- annular protrusion
- machining method
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- 238000000034 method Methods 0.000 title claims description 27
- 238000003754 machining Methods 0.000 title claims description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 44
- 238000003672 processing method Methods 0.000 claims abstract description 5
- 238000005255 carburizing Methods 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 12
- 238000005452 bending Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000007547 defect Effects 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
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Classifications
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a bearing outer ring processing method, 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 protrusion 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 protrusion part is an annular protrusion arranged on the outer circumferential surface of the body part and extending from one side of a narrow end surface to one side of a wide end surface, the annular protrusion comprises a bottom surface and a side surface, the bottom surface of the annular protrusion extends outwards from the outer edge of the narrow end surface of the body part, and the side surface of the annular protrusion extends obliquely from the outer edge of the bottom surface of the annular protrusion to one side of the wide end surface of the body part and intersects with the outer circumferential surface of the body part. The convex bulge is arranged on one side, close to the narrow end face, of the bearing outer ring to resist deflection of the narrow end face of the bearing outer ring after heat treatment, and the shape of an inclined raceway on the bearing outer ring after heat treatment can be basically consistent with the inclination angle of a finished raceway.
Description
Technical Field
The invention relates to the technical field of bearings, in particular to a bearing outer ring machining method.
Background
As shown in fig. 1, in the prior art, when carburizing a bearing outer ring provided with inclined raceways, a certain amount of allowance is reserved in the width direction according to the inner diameter dimension corresponding to the inclined raceway surface on the inner circumferential surface of the bearing outer ring and the outer diameter dimension corresponding to the outer circumferential surface of the bearing outer ring, which are the same. As shown in fig. 2, after heat treatment according to the above allowance, heat treatment warpage occurs, raceway position variation is large, the bearing outer ring angle is unreasonable, the narrow end face of the whole bearing outer ring is warped upwards, the bearing outer ring needs to be in a top shape after heat treatment, internal stress concentration is caused by the top shape, the depth of a carburized layer after grinding is inconsistent, and the depth and hardness of the obtained raceway carburized layer on the inner circumferential surface of the outer ring do not meet quality requirements.
Disclosure of Invention
In view of the defects in the prior art, the invention aims to provide a bearing outer ring processing method to solve the problem of large deformation of the bearing outer ring during carburization, which is proposed in the background art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a bearing outer ring machining method comprises the following steps: turning the bearing outer ring before heat treatment, wherein the turned bearing outer ring comprises a body part and a protrusion 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 protrusion part is an annular protrusion arranged on the outer circumferential surface of the body part and extending from one side of a narrow end surface to one side of a wide end surface, the annular protrusion comprises a bottom surface and a side surface, the bottom surface of the annular protrusion extends outwards from the outer edge of the narrow end surface of the body part, and the side surface of the annular protrusion extends obliquely from the outer edge of the bottom surface of the annular protrusion to one side of the wide end surface of the body part and intersects with the outer circumferential surface of the body part.
Further, a bottom surface of the annular projection extends radially outward from an outer edge of the body portion narrow end surface.
Further, the outer contour of the radial section of the annular bulge is circular.
Further, an axial sectional contour line of a side surface of the annular projection is parallel to an axial sectional contour line of an inner peripheral surface of the body portion.
Further, the annular projection has an axial dimension between one-half and one-third of an axial dimension of the body portion.
Further, the method also comprises the following steps: and performing carburizing treatment on the turned bearing outer ring.
Further, the method also comprises the following steps: and turning off the bulge after carburization treatment.
Further, the method also comprises the following steps: and grinding the body part.
Further, the grinding process of the body portion includes the steps of: and grinding the inner peripheral surface of the body part and the outer peripheral surface of the body part.
Furthermore, the allowance of the inner conical surface close to the narrow end surface before the heat treatment of the body part is larger than the allowance of the inner conical surface close to the wide end surface.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a bearing outer ring processing method, 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 protrusion 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 protrusion part is an annular protrusion arranged on the outer circumferential surface of the body part and extending from one side of a narrow end surface to one side of a wide end surface, the annular protrusion comprises a bottom surface and a side surface, the bottom surface of the annular protrusion extends outwards from the outer edge of the narrow end surface of the body part, and the side surface of the annular protrusion extends obliquely from the outer edge of the bottom surface of the annular protrusion to one side of the wide end surface of the body part and intersects with the outer circumferential surface of the body part. The convex bulge is arranged on one side, close to the narrow end face, of the bearing outer ring to resist deflection of the narrow end face of the bearing outer ring after heat treatment, and the shape of an inclined raceway on the bearing outer ring after heat treatment can be basically consistent with the inclination angle of a finished raceway.
Drawings
FIG. 1 is a schematic structural diagram of a bearing outer ring before carburizing treatment in the prior art;
FIG. 2 is a schematic structural diagram of a bearing outer ring after carburizing treatment in the prior art;
FIG. 3 is a schematic structural view of the bearing outer ring of the present embodiment before carburizing treatment;
FIG. 4 is a schematic structural view of the bearing outer ring of the present embodiment after carburizing treatment.
In the figure: 1. the prior art comprises a contour before heat treatment of a bearing outer ring, 2 an actual contour after processing of the bearing outer ring, 2.1 a raceway, 3 a contour after heat treatment of the bearing outer ring, 4 a body part, 4.1 a contour before heat treatment of the body part, 4.2 a contour after heat treatment of the body part, 5 a narrow end face, 6 an annular bulge, 6.1 a bottom face of the annular bulge, 6.2 a side face of the annular bulge, 6.3 a contour of the annular bulge before heat treatment, and 6.4 a contour of the annular boss after heat treatment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
As can be seen from a comparison of fig. 1 and 2, the profile 1 before the heat treatment of the bearing outer ring in the prior art is transformed into the profile 3 after the heat treatment of the bearing outer ring in the prior art after the carburizing treatment, wherein the profile 3 after the heat treatment of the bearing outer ring in the prior art is greatly deformed in a bending manner at the narrow end face 5 of the bearing outer ring relative to the actual profile 2 after the finishing of the machining of the bearing outer ring.
In order to solve the above problems, the present embodiment provides a bearing outer ring processing method, which includes the following steps: 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 protrusion part, wherein 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 protrusion part is an annular protrusion 6 arranged on the outer circumferential surface of the body part 4 and extending from one side of a narrow end surface to one side of a wide end surface, the annular protrusion 6 comprises a bottom surface and a side surface, a bottom surface 6.1 of the annular protrusion extends outwards from the outer edge of the narrow end surface of the body part 4, and a side surface 6.2 of the annular protrusion extends obliquely from the outer edge of the bottom surface 6.1 of the annular protrusion to one side of the wide end surface of the body part 4 and intersects with the outer circumferential surface of the body part 4.
In the present embodiment, the projection on the bearing outer ring after turning the shaft is provided outside the narrow end face side of the main body portion 4, that is, in the same direction as the direction in which the narrow end face of the main body portion 4 is bent after heat treatment. As can be seen from comparison between fig. 3 and fig. 4, in the present embodiment, the deformation of the profile 4.1 of the body portion 4 before heat treatment and the profile 6.3 of the annular protrusion before heat treatment after carburization is small, that is, the deformation between the profile 4.2 of the body portion 4 after heat treatment and the profile 6.4 of the annular protrusion after heat treatment with respect to the actual profile 2 after the machining of the bearing outer ring is completed is small, and the design requirements can be satisfied. That is, the provision of the protruding portion in the present embodiment reduces the deflection deformation of the bearing outer ring narrow end surface after heat treatment, ensures that the deflection deformation of the narrow end surface of the body portion 4 after heat treatment is within the range of the design requirement, does not need to perform secondary shaping treatment after heat treatment, and improves the product quality and precision.
Preferably, the bottom surface 6.1 of the annular projection in this embodiment extends radially outwardly from the outer edge of the narrow end face 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. It should be noted that 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 obliquely arranged 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 protrusion 6 in this embodiment is circular. I.e. the annular protrusion 6 in this embodiment is frustoconical. It should be noted that the axial size and the taper of the frustum-shaped annular protrusion 6 may be selected according to actual conditions.
In order to enhance the effect of the protrusion against the deflection deformation of the bearing outer ring after heat treatment of the narrow end surface, the axial sectional contour of the side surface 6.2 of the annular protrusion of the present embodiment is parallel to the axial sectional contour of the inner peripheral surface of the body portion 4, i.e. the taper of the annular protrusion 6 is the same as the taper of the inner conical surface of the body portion 4.
The axial dimension of the annular projection 6 of the present embodiment is controlled to be 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 to be between one half and one third of the axial dimension of the main body 4, the taper of the inner conical surface of the bearing outer ring main body after heat treatment is approximately consistent with the taper of the actual raceway 2.1 after the bearing outer ring is processed, so that the consistency of the carburized layer thickness of the whole actual raceway 2.1 after grinding is ensured.
The method comprises the following steps of carrying out carburizing treatment on the bearing outer ring after turning, specifically, carrying out carburizing treatment on the outer peripheral surface of the body part 4, the outer peripheral surface of the bulge part and the inner conical surface of the body part 4 to obtain a hardened layer with certain thickness and hardness; turning off a convex part of the bearing outer ring after carburizing; the main body 4 is then ground, specifically, the inner peripheral surface of the main body 4 and the outer peripheral surface of the main body 4 are ground.
In the present embodiment, the inner peripheral surface of the main body 4 is heat-treated and then ground to form the final raceway 2.1 of the bearing outer ring product.
It should be noted that, in the embodiment, the bearing outer ring before heat treatment is provided with the convex portion to resist the bending deformation produced by the heat treatment at the narrow end face of the bearing outer ring, so that the shape of the raceway after heat treatment can be ensured to be basically consistent with the angle of the finished raceway 2.1, and thus the carburized layer is consistent. In the embodiment, the raised parts need to be removed after the hot working, and although the carburized layer and the hardness of the positions of the raised parts are not good after the raised parts are removed, the poor hardness of the raised parts on the outer circumferential surface of the outer ring of the bearing does not affect the use from the application perspective because the main fatigue points of the bearing in the use process are the raceway and the roller.
The bearing outer ring after the heat treatment in the above steps may also have slight deflection towards the outer diameter at the narrow end face, and the solution can be achieved by the following method: the allowance of the inner conical surface of the body part before heat treatment, which is close to the narrow end surface, is larger than the allowance of the inner conical surface of the body part before heat treatment, which is close to the wide end surface, i.e. the taper of the inner conical surface of the body part before heat treatment is smaller than the taper of the inner conical surface (raceway 2.1) of the actual profile of the bearing outer ring after processing. The remaining amount of the inner conical surface of the body part close to the narrow end surface is increased before heat treatment, so that the angle of the inner conical hole of the heat treated body part is consistent with that of the finished inner conical hole.
Compared with the prior art, the embodiment has the beneficial effects that:
in the embodiment, the bearing outer ring is provided with the bulge part before heat treatment to resist the bending deformation generated after the carburizing heat treatment at the narrow end face of the bearing outer ring, and the angle of the raceway of the bearing outer ring after the heat treatment is basically consistent with the 2.1 angle of the raceway of the bearing outer ring of a finished product, so that the consistency of carburized layers is realized, the subsequent grinding processing of the raceway surface of the bearing outer ring is facilitated, and the product quality and the precision are finally ensured.
In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like are used in the orientations and positional relationships indicated in the drawings only for the convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, are not to 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A bearing outer ring processing method is characterized by comprising the following steps: turning the bearing outer ring before heat treatment, wherein the turned bearing outer ring comprises a body part and a protrusion 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 protrusion part is an annular protrusion arranged on the outer circumferential surface of the body part and extending from one side of a narrow end surface to one side of a wide end surface, the annular protrusion comprises a bottom surface and a side surface, the bottom surface of the annular protrusion extends outwards from the outer edge of the narrow end surface of the body part, and the side surface of the annular protrusion extends obliquely from the outer edge of the bottom surface of the annular protrusion to one side of the wide end surface of the body part and intersects with the outer circumferential surface of the body part.
2. The bearing outer ring machining method according to claim 1, characterized in that: the bottom surface of the annular projection extends radially outwardly from the outer edge of the body portion narrow end surface.
3. The bearing outer ring machining method according to claim 1, characterized in that: the outer contour of the radial section of the annular bulge is circular.
4. The bearing outer ring machining method according to claim 1, characterized in that: the axial sectional contour line of the side face of the annular protrusion is parallel to the axial sectional contour line of the inner peripheral face of the body portion.
5. The bearing outer ring machining method according to claim 1, characterized in that: the annular projection has an axial dimension between one-half and one-third of an axial dimension of the body portion.
6. A bearing outer ring machining method according to any one of claims 1 to 5, characterized by further comprising the steps of: and (5) carrying out carburizing treatment on the turned bearing outer ring.
7. The bearing outer ring machining method according to claim 6, characterized by further comprising the steps of: and turning off the bulge after carburization treatment.
8. The bearing outer ring machining method according to claim 7, characterized by further comprising the steps of: and grinding the body part.
9. The bearing outer ring machining method according to claim 8, characterized in that: the grinding process of the body part comprises the following steps: grinding the inner peripheral surface of the main body and the outer peripheral surface of the main body.
10. The bearing outer ring machining method according to claim 1, characterized in that: the allowance of the inner conical surface close to the narrow end surface before the heat treatment of the body part is larger than the allowance of the inner conical surface close to 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 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210613935.1A CN114749878B (en) | 2022-06-01 | 2022-06-01 | Bearing outer ring machining method |
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| CN114749878A true CN114749878A (en) | 2022-07-15 |
| CN114749878B CN114749878B (en) | 2024-01-16 |
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| CN202210613935.1A Active CN114749878B (en) | 2022-06-01 | 2022-06-01 | Bearing outer ring machining method |
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| JP2004197761A (en) * | 2002-12-16 | 2004-07-15 | Koyo Seiko Co Ltd | Shell roller bearing |
| JP2007170447A (en) * | 2005-12-19 | 2007-07-05 | Ntn Corp | Method for manufacturing raceway ring for thrust roller bearing and device for manufacturing same |
| JP2007321892A (en) * | 2006-06-01 | 2007-12-13 | Nsk Ltd | Method of manufacturing annular component |
| CN101592191A (en) * | 2009-06-29 | 2009-12-02 | 洛阳Lyc轴承有限公司 | The processing method of reinforcing ring of large-sized thin wall complex structure bearing ring |
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| CN201513476U (en) * | 2009-09-18 | 2010-06-23 | 宁波达克轴承有限公司 | Raceway structure of short cylindrical roller bearing |
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| CN111020457A (en) * | 2019-11-26 | 2020-04-17 | 中国航发中传机械有限公司 | Carburizing heat treatment control method for spiral bevel gear |
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-
2022
- 2022-06-01 CN CN202210613935.1A patent/CN114749878B/en active Active
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| JP2004197761A (en) * | 2002-12-16 | 2004-07-15 | Koyo Seiko Co Ltd | Shell roller bearing |
| JP2007170447A (en) * | 2005-12-19 | 2007-07-05 | Ntn Corp | Method for manufacturing raceway ring for thrust roller bearing and device for manufacturing same |
| JP2007321892A (en) * | 2006-06-01 | 2007-12-13 | Nsk Ltd | Method of manufacturing annular component |
| CN101592191A (en) * | 2009-06-29 | 2009-12-02 | 洛阳Lyc轴承有限公司 | The processing method of reinforcing ring of large-sized thin wall complex structure bearing ring |
| CN101684519A (en) * | 2009-06-29 | 2010-03-31 | 洛阳Lyc轴承有限公司 | Method for improving heat treatment deformation of thin-wall light narrow series bearing ring |
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| CN108687162A (en) * | 2018-05-02 | 2018-10-23 | 珠海市美图金属科技有限公司 | A kind of abnormity flat tube moulding process |
| CN111020457A (en) * | 2019-11-26 | 2020-04-17 | 中国航发中传机械有限公司 | Carburizing heat treatment control method for spiral bevel gear |
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| CN113695845A (en) * | 2021-08-10 | 2021-11-26 | 洛阳轴承研究所有限公司 | Method for machining floating ring of main drive bearing of tunneling machine |
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| CN114749878B (en) | 2024-01-16 |
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