JP3303171B2 - Manufacturing method of steel for bearing race - Google Patents
Manufacturing method of steel for bearing raceInfo
- Publication number
- JP3303171B2 JP3303171B2 JP02519792A JP2519792A JP3303171B2 JP 3303171 B2 JP3303171 B2 JP 3303171B2 JP 02519792 A JP02519792 A JP 02519792A JP 2519792 A JP2519792 A JP 2519792A JP 3303171 B2 JP3303171 B2 JP 3303171B2
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- hardness
- manufacturing
- bearing ring
- depth
- Prior art date
- 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.)
- Ceased
Links
Landscapes
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、軸受用軌道輪の製造
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a bearing ring for a bearing .
【０００２】[0002]
【従来の技術】従来、軸受寿命向上手段として、種々の
ものが提案されている。たとえば、潤滑油中に混入した
異物に対して有効な手段として、表面硬さを高くするこ
とが考えられている。また、亀裂の進展をおさえる手段
として、残留オーステナイトをある程度残すことや、残
留応力を付与することなどが考えられている。Conventionally, various means have been proposed as means for improving the bearing life. For example, increasing the surface hardness has been considered as an effective means for foreign substances mixed in the lubricating oil. Further, as a means for suppressing the growth of the crack, it is considered to leave a certain amount of retained austenite or to provide a residual stress.
【０００３】[0003]
【発明が解決しようとする課題】実際の軸受に対して
は、対異物、亀裂の進展ともに重要であるが、たとえ
ば、表面硬さを高くすることと残留オーステナイトを残
すことは一般的には相反することとなり、両方の性能が
優れている軸受を作ることは非常に困難である。For an actual bearing, both foreign matter and crack growth are important. For example, increasing the surface hardness and leaving retained austenite are generally contradictory. Therefore, it is very difficult to produce a bearing having both excellent performances.
【０００４】この発明の目的は、上記の問題を解決し、
潤滑油中に混入した異物による亀裂の発生および発生し
た亀裂の進展に対して強く、よって軸受寿命の向上が可
能な軸受用軌道輪を得ることができる方法を提供するこ
とにある。An object of the present invention is to solve the above problems,
It is an object of the present invention to provide a method for obtaining a bearing ring for a bearing that is resistant to the generation of cracks and the growth of the cracks caused by foreign matter mixed in lubricating oil, and that can improve the bearing life.
【０００５】[0005]
【課題を解決するための手段】この発明による軸受用軌
道輪の製造方法は、異物の混入した潤滑油中で使用され
る軸受の軌道輪を製造する方法であって、鋼よりなる軌
道輪素材の表層部の残留オーステナイト量を１０〜３０
％、硬さをロックウェルＣ硬さで６０〜６５にする熱処
理工程、および軌道輪素材に機械加工により残留圧縮応
力を付与し、表層部のうち表面から深さ０．０５ｍｍま
での範囲の最表層の残留オーステナイトの一部をマルテ
ンサイトに変態させる加工工程を含むことを特徴とする
ものである。SUMMARY OF THE INVENTION A bearing rail according to the present invention.
Method for producing Michiwa is a method of manufacturing a bearing ring of a bearing for use in contaminated lubricating oil in, consisting of steel trajectories
Reduce the amount of retained austenite in the surface layer of the road ring material from 10 to 30
%, A heat treatment step of setting the hardness to 60 to 65 in Rockwell C hardness, and applying a residual compressive stress by machining to the raceway material , and a maximum depth of 0.05 mm from the surface of the surface layer portion to a depth of 0.05 mm. The method includes a processing step of transforming a part of the retained austenite in the surface layer into martensite.
【０００６】[0006]
【作用】表面から深さ０．０５ｍｍまでの範囲の最表層
の残留オーステナイトの一部をマルテンサイトに変態さ
せるので、表面の硬さが非常に高くなり、潤滑油中に混
入した異物に強く、表面を起点とする亀裂の発生がおさ
えられる。また、最表層以外の内部は残留オーステナイ
トが比較的多いため、亀裂の進展がおさえられる。さら
に、残留圧縮応力を付与するので、疲労寿命が向上す
る。[Action] Since a part of the retained austenite in the outermost layer in the range from the surface to a depth of 0.05 mm is transformed into martensite, the surface hardness becomes extremely high, and it is strong against foreign substances mixed in the lubricating oil. The generation of cracks starting from the surface is suppressed. In addition, since the inside other than the outermost layer has a relatively large amount of retained austenite, the growth of the crack is suppressed. Further, since a residual compressive stress is applied, the fatigue life is improved.
【０００７】なお、表層部とは表面から深さ１mm程度の
範囲をいい、最表層とは表面から深さ０．０５ｍｍ程度
の範囲をいう。表層部の残量オーステナイトが１０％未
満であれば、後の機械加工による硬化を期待できない。
また、これが３０％より多ければ、元の硬さが出ない。
表層部のロックウェルＣ硬さ６０〜６５は、軸受として
必要な値である。[0007] The surface layer means a range of about 1 mm deep from the surface, and the outermost layer means a range of about 0.05 mm deep from the surface. If the remaining austenite in the surface layer portion is less than 10%, hardening by subsequent machining cannot be expected.
If this is more than 30%, the original hardness is not obtained.
The Rockwell C hardness 60 to 65 of the surface layer is a value required for a bearing.
【０００８】[0008]
【実施例】以下、図面を参照して、この発明の実施例に
ついて説明する。Embodiments of the present invention will be described below with reference to the drawings.
【０００９】図１は、軸受用軌道輪の製造方法の１例を
示す工程図である。FIG. 1 is a process chart showing an example of a method for manufacturing a bearing race .
【００１０】次に、玉軸受の軌道輪を例にとり、図１の
工程図を参照して、この発明による製造方法の１例を説
明する。Next, an example of a manufacturing method according to the present invention will be described with reference to a process chart of FIG. 1 taking a race of a ball bearing as an example.
【００１１】図１において、まず、軸受鋼よりなる軌道
輪素材の焼入れ焼戻しあるいははだ焼き鋼よりなる軌道
輪素材の浸炭・浸炭窒化焼入れ焼戻しにより、表面から
深さ１mm程度の範囲の表層部の残留オーステナイトを１
０〜３０％、硬さをロックウェルＣ硬さ（ＨＲＣ）で６
０〜６５にする熱処理を行なう（工程１）。In FIG. 1, first, the surface layer portion having a depth of about 1 mm from the surface is subjected to quenching and tempering of a bearing ring material made of bearing steel or carburizing / carbonitriding quenching and tempering of a bearing ring material made of hardened steel. 1 retained austenite
0-30%, hardness is Rockwell C hardness (HRC) 6
A heat treatment for reducing the temperature to 0 to 65 is performed (step 1).
【００１２】次に、軌道輪素材の軌道部に研削、旋削、
ショットピーニングなどの機械加工を施すことにより、
１００kgf/mm２ 以上の残留圧縮応力を付与し、表面か
ら深さ０．０５mmまでの範囲の最表層の残留オーステナ
イトの一部をマルテンサイトに変態させる加工工程を行
なう（工程２）。Next, grinding, turning,
By performing machining such as shot peening,
A processing step of applying a residual compressive stress of 100 kgf / mm 2 or more and transforming a part of the residual austenite in the outermost layer from the surface to a depth of 0.05 mm into martensite (step 2).
【００１３】第１の例では、加工工程（工程２）におい
て、ＨＲＣ６０以上の鋼球を使用し、アークハイト０．
９mmＡ、カバレッジ２００％の条件でショットピーニン
グを行なった。In the first example, in the processing step (step 2), steel balls having an HRC of 60 or more are used, and the arc height is set to 0.
Shot peening was performed under the conditions of 9 mmA and 200% coverage.
【００１４】図２はこのようにして製造した軌道輪の表
面からの深さに対する残留圧縮応力（kgf/mm２ ）の測
定値を示し、図３は同軌道輪の表面からの深さに対する
硬さ（ＨＲＣ）の測定値を示している。なお、図３にお
いて、比較のため、ずぶ焼入れを行なったときの硬さを
破線で示している。FIG. 2 shows the measured values of the residual compressive stress (kgf / mm 2 ) with respect to the depth from the surface of the ring thus manufactured, and FIG. 3 shows the hardness with respect to the depth from the surface of the ring. 2 shows a measured value of the hardness (HRC). In FIG. 3, for comparison, the hardness when soaking is performed is indicated by a broken line.
【００１５】上記のようにして製造した軌道輪は、最表
層の残留オーステナイトの一部がマルテンサイトに変態
しているので、図３からも明らかなように、表面の硬さ
が非常に高くなり、潤滑油中に混入した異物に強く、表
面を起点とする亀裂の発生がおさえられる。また、最表
層以外の内部は残留オーステナイトが比較的多いため、
亀裂の進展がおさえられる。さらに、図２からも明らか
なように、表層部に残留圧縮応力が付与されているの
で、疲労寿命が向上する。In the bearing ring manufactured as described above, since a part of the retained austenite in the outermost layer is transformed into martensite, the surface hardness becomes very high as is apparent from FIG. In addition, it is resistant to foreign substances mixed in the lubricating oil, and the generation of cracks starting from the surface is suppressed. In addition, since the interior other than the outermost layer has a relatively large amount of retained austenite,
Crack growth is suppressed. Furthermore, as is clear from FIG. 2, since the residual compressive stress is applied to the surface layer, the fatigue life is improved.
【００１６】上述のようにしてこの発明による方法で製
造した軌道輪を使用した軸受と従来の軸受について、寿
命試験を行なったところ、この発明による方法で製造し
た軌道輪を使用した軸受は、従来の軸受に比べて、清浄
油中での寿命比が５倍、汚れ油中での寿命比が１０倍に
なった。 As described above, the method of the present invention
A life test was performed on a bearing using the manufactured bearing ring and a conventional bearing.
A bearing using a bearing ring that has been used has five times the life ratio in a clean oil and 10 times the life ratio in a contaminated oil as compared with a conventional bearing.
【００１７】第２の例では、加工工程（工程２）におい
て、周速１３０ｍ／min 、送り速度０．１５mm／rev の
条件で旋削を行なった。In the second example, in the working process (process 2), turning was performed under the conditions of a peripheral speed of 130 m / min and a feed speed of 0.15 mm / rev.
【００１８】図４はこのようにして製造した軌道輪の表
面からの深さに対する残留圧縮応力（kgf/mm２ ）の測
定値を示し、図５は同軌道輪の表面からの深さに対する
硬さ（ＨＲＣ）の測定値を示している。FIG. 4 shows the measured values of the residual compressive stress (kgf / mm 2 ) with respect to the depth from the surface of the thus manufactured bearing ring, and FIG. 5 shows the hardness with respect to the depth from the surface of the same bearing ring. 2 shows a measured value of the hardness (HRC).
【００１９】第２の例の軌道輪の残留圧縮応力と硬さも
図２および図３で説明した第１の例のそれと同じ傾向を
示し、第２の例の軌道輪も第１の例の軌道輪と同等の作
用効果を奏する。The residual compressive stress and hardness of the bearing ring of the second example also show the same tendencies as those of the first example described with reference to FIGS. 2 and 3, and the bearing ring of the second example also has the same bearing of the first example. It has the same effect as a ring.
【００２０】[0020]
【発明の効果】この発明の軸受用軌道輪の製造方法によ
れば、上述のように、異物や亀裂の進展に対して強く、
しかも疲労寿命の向上した軌道輪を得ることができる。According to the method of manufacturing a bearing race for a bearing of the present invention, as described above, it is resistant to the development of foreign matter and cracks,
Moreover, a bearing ring having an improved fatigue life can be obtained.
【図１】この発明の軸受用軌道輪の製造方法の１例を示
す工程図である。FIG. 1 is a process chart showing an example of a method for manufacturing a bearing race for a bearing according to the present invention.
【図２】この発明の方法により製造した第１の例の軌道
輪の表面からの深さに対する残留圧縮応力の測定結果を
示すグラフである。FIG. 2 shows a first example track manufactured by the method of the present invention.
It is a graph which shows the measurement result of the residual compressive stress with respect to the depth from the surface of a ring .
【図３】この発明の方法により製造した第１の例の軌道
輪の表面からの深さに対する硬さの測定結果を示すグラ
フである。FIG. 3 shows a first example track manufactured by the method of the present invention.
It is a graph which shows the measurement result of hardness with respect to the depth from the surface of a ring .
【図４】この発明の方法により製造した第２の例の軌道
輪の表面からの深さに対する残留圧縮応力の測定結果を
示すグラフである。FIG. 4 shows a second example track manufactured by the method of the present invention.
It is a graph which shows the measurement result of the residual compressive stress with respect to the depth from the surface of a ring .
【図５】この発明の方法により製造した第２の例の軌道
輪の表面からの深さに対する硬さの測定結果を示すグラ
フである。FIG. 5 shows a second example track manufactured by the method of the present invention.
It is a graph which shows the measurement result of hardness with respect to the depth from the surface of a ring .
(1) 熱処理工程 (2) 加工工程 (1) Heat treatment process (2) Processing process
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C21D 8/00 - 8/10 C21D 9/00 C21D 9/40 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) C21D 8/00-8/10 C21D 9/00 C21D 9/40
Claims (1)
の軌道輪を製造する方法であって、 鋼よりなる軌道輪素材の表層部の残留オーステナイト量
を１０〜３０％、硬さをロックウェルＣ硬さで６０〜６
５にする熱処理工程、および軌道輪素材に機械加工によ
り残留圧縮応力を付与し、表層部のうち表面から深さ
０．０５ｍｍまでの範囲の最表層の残留オーステナイト
の一部をマルテンサイトに変態させる加工工程を含むこ
とを特徴とする軸受用軌道輪の製造方法。1. A method of manufacturing a bearing ring used in lubricating oil mixed with foreign matter, comprising: a residual amount of austenite in a surface layer portion of a bearing ring material made of steel; Rockwell C hardness 60-60
5, a residual compressive stress is applied to the bearing ring material by machining to transform a part of the residual austenite in the outermost surface layer of the surface layer from the surface to a depth of 0.05 mm into martensite. A method for manufacturing a bearing ring for a bearing , comprising a processing step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02519792A JP3303171B2 (en) | 1991-10-15 | 1992-02-12 | Manufacturing method of steel for bearing race |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3-266109 | 1991-10-15 | ||
| JP26610991 | 1991-10-15 | ||
| JP02519792A JP3303171B2 (en) | 1991-10-15 | 1992-02-12 | Manufacturing method of steel for bearing race |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05163526A JPH05163526A (en) | 1993-06-29 |
| JP3303171B2 true JP3303171B2 (en) | 2002-07-15 |
Family
ID=26362791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02519792A Ceased JP3303171B2 (en) | 1991-10-15 | 1992-02-12 | Manufacturing method of steel for bearing race |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3303171B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7438665B2 (en) * | 2019-02-05 | 2024-02-27 | 住友重機械工業株式会社 | Eccentric rocking type reduction gear, manufacturing method of eccentric body |
-
1992
- 1992-02-12 JP JP02519792A patent/JP3303171B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05163526A (en) | 1993-06-29 |
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