JP3051944B2 - Rolling bearing parts - Google Patents
Rolling bearing partsInfo
- Publication number
- JP3051944B2 JP3051944B2 JP3105507A JP10550791A JP3051944B2 JP 3051944 B2 JP3051944 B2 JP 3051944B2 JP 3105507 A JP3105507 A JP 3105507A JP 10550791 A JP10550791 A JP 10550791A JP 3051944 B2 JP3051944 B2 JP 3051944B2
- Authority
- JP
- Japan
- Prior art keywords
- hardness
- rolling
- fatigue life
- rolling bearing
- rockwell
- 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.)
- Expired - Fee Related
Links
Landscapes
- Rolling Contact Bearings (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、たとえば自動車用転
がり軸受などのように高速回転する軸を支持する転がり
軸受に用いられる転がり疲労寿命に優れた転がり軸受部
品に関する。BACKGROUND OF THE INVENTION This invention relates to, for example, the excellent rolling bearing component to rolling fatigue life used rolling bearing for supporting a shaft rotating at a high speed, such as automotive rolling bearing.
【０００２】[0002]
【従来の技術】従来、この種転がり軸受部品としては、
SAE ５１２０などの肌焼鋼や、JIS ＳＵＪ２などの高炭
素クロム軸受鋼からなり、これに浸炭処理または浸炭窒
化熱処理を施したものが知られている。Conventionally, as a bearing parts rolling this kind,
Known are those made of case hardened steel such as SAE 5120 and high carbon chromium bearing steel such as JIS SUJ2, which have been subjected to carburizing treatment or carbonitriding heat treatment.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上記のよう
な転がり軸受は、厳しい条件下、たとえば潤滑油中に異
物が混入しているというような条件下で使用されること
もあり、この場合も十分な転がり疲労寿命が要求され
る。Incidentally, the above-mentioned rolling bearings are sometimes used under severe conditions, for example, under the condition that foreign matters are mixed in lubricating oil. Sufficient rolling fatigue life is required.
【０００４】しかしながら、従来の転がり軸受部品のう
ち、肌焼鋼からなり、かつこれに浸炭処理または浸炭窒
化熱処理を施した転がり軸受部品の場合、内部硬さが十
分に大きくならない。また、高炭素クロム軸受鋼からな
り、かつこれに浸炭処理または浸炭窒化熱処理を施した
転がり軸受部品の場合、もともとＣ含有量が多いために
浸炭による表面硬さ増大の効果が少なく、表面硬さと内
部硬さの硬度差が小さくなる。したがって、いずれの場
合も、厳しい条件下では十分な転がり疲労寿命が得られ
ない。However, among the conventional rolling bearing component consists hardening steel, and the case of the bearing components rolling was subjected to a carburizing treatment or carbonitriding heat treatment thereto, the internal hardness is not sufficiently large. In addition, it is made of high carbon chromium bearing steel and has been subjected to carburizing or carbonitriding heat treatment.
If the bearing parts rolling, originally small effect of surface hardness increase according to carburization because many C content, the hardness difference between the surface hardness and internal hardness is reduced. Therefore, in any case, sufficient rolling fatigue life cannot be obtained under severe conditions.
【０００５】この発明の目的は、上記問題を解決し、転
がり疲労寿命に優れた転がり軸受部品を提供することに
ある。[0005] An object of the present invention is to solve the above-mentioned problem and to improve the
Rising to provide an excellent rolling bearing component fatigue life.
【０００６】[0006]
【課題を解決するための手段】この発明による転がり疲
労寿命性に優れた転がり軸受部品は、Ｃ：０．４〜０．
８wt％、Ｓｉ：０．１５〜０．５０wt％、Ｍｎ：０．１
５〜１．０wt％、Ｃｒ：２〜６wt％を含有し、残部Ｆｅ
および不可避不純物からなる鋼よりなり、浸炭処理また
は浸炭窒化熱処理が施されて内部硬さがロックウェルＣ
硬さで４５以上とされ、かつ表面硬さが内部硬さよりも
ロックウェルＣ硬さで５〜１５大きくなされているもの
である。SUMMARY OF THE INVENTION Rolling fatigue according to the present invention is disclosed.
Excellent rolling bearing component in labor service life, C: 0.4~0.
8 wt%, Si: 0.15 to 0.50 wt%, Mn: 0.1
5 to 1.0 wt%, Cr: 2 to 6 wt%, with the balance Fe
And a steel consisting of unavoidable impurities, which is subjected to a carburizing treatment or a carbonitriding heat treatment so that the internal hardness is
The hardness is set to 45 or more, and the surface hardness is made 5 to 15 larger in Rockwell C hardness than the internal hardness.
【０００７】上記合金成分の限定理由は、次の通りであ
る。The reasons for limiting the above alloy components are as follows.
【０００８】Ｃ：０．４〜０．８wt％ Ｃは、熱処理により内部硬さをロックウェルＣ硬さ(HR
C) で４５以上とし、転がり疲労寿命を向上させるとと
もに、全体の剛性を向上させる性質を有するが、その含
有量が０．４wt％未満であるとこの効果を得られず、
０．８wt％を越えると内部硬さが大きくなり過ぎて靭性
が低下し、強度の低下に繋がる。したがって、Ｃの含有
量は０．４〜０．８wt％の範囲内で選ぶべきである。C: 0.4-0.8 wt% C has an internal hardness of Rockwell C hardness (HR)
C) is 45 or more, and has the property of improving the rolling fatigue life and improving the overall rigidity. However, if the content is less than 0.4 wt%, this effect cannot be obtained,
If it exceeds 0.8 wt%, the internal hardness becomes too large and the toughness is reduced, leading to a reduction in strength. Therefore, the content of C should be selected within the range of 0.4 to 0.8 wt%.
【０００９】Ｓｉ：０．１５〜０．５０wt％ Ｓｉは、精錬のさいの脱酸のために必要な元素である。
脱酸が不十分であると酸化物系非金属介在物が増加し、
これが応力集中源となって使用中の組織変化を促進し、
剥離起点となる微小亀裂が発生、進展し、転がり疲労寿
命の低下に繋がる。しかしながら、Ｓｉの含有量が０．
１５wt％未満であると精錬のさいの脱酸が十分に行われ
ず、０．５０wt％を越えると焼入れ後の残留オーステナ
イト量が増加し、焼入れ硬さが低下して転がり疲労寿命
が低下する。また、球状化焼鈍後の炭化物の球状化が悪
くなるので炭化物が応力集中源となり、転がり疲労寿命
が低下するとともに、焼鈍後の硬さが大きくなって被切
削性が低下する。したがって、Ｓｉ含有量は０．１５〜
０．５０wt％の範囲内で選ぶべきである。Si: 0.15 to 0.50 wt% Si is an element necessary for deoxidation during refining.
Insufficient deoxidation increases oxide nonmetallic inclusions,
This is a source of stress concentration and promotes tissue changes during use,
A microcrack, which is a starting point of peeling, is generated and propagates, leading to a reduction in rolling fatigue life. However, when the content of Si is 0.1.
If it is less than 15 wt%, deoxidation during refining will not be performed sufficiently. If it exceeds 0.50 wt%, the amount of retained austenite after quenching will increase, the quenching hardness will decrease, and the rolling fatigue life will decrease. In addition, since the spheroidization of the carbide after spheroidizing annealing deteriorates, the carbide serves as a stress concentration source, and the rolling fatigue life is reduced, and the hardness after annealing is increased to reduce the machinability. Therefore, the Si content is 0.15
It should be selected within the range of 0.50 wt%.
【００１０】Ｍｎ：０．１５〜１．０wt％ Ｍｎは、Ｓｉと同様に精錬のさいの脱酸のために必要な
元素であるとともに、焼入れ性を向上させる性質を有し
ており、しかも安価である。しかしながら、Ｍｎの含有
量が０．１５wt％未満であると精錬のさいの脱酸が不十
分であるとともに、焼入れ性向上の効果を得られず、
１．０wt％を越えると機械加工性が低下する。したがっ
て、Ｍｎ含有量は０．１５〜１．０wt％の範囲内で選ぶ
べきである。Mn: 0.15 to 1.0 wt% Mn is an element necessary for deoxidation at the time of refining like Si, has the property of improving hardenability, and is inexpensive. It is. However, when the content of Mn is less than 0.15% by weight, deoxidation during refining is insufficient, and the effect of improving hardenability cannot be obtained.
If it exceeds 1.0% by weight, machinability will be reduced. Therefore, the Mn content should be selected within the range of 0.15 to 1.0 wt%.
【００１１】Ｃｒ：２〜６wt％ Ｃｒは、浸炭処理または浸炭窒化熱処理により表面部に
Ｃｒリッチな炭化物または炭窒化物を析出し、表面硬さ
を大きくして耐摩耗性を向上させる性質を有するが、そ
の含有量が２wt％未満であると上記効果を得られず、６
wt％を越えると表面部にネット状炭化物や巨大炭化物が
析出し、転がり疲労寿命を低下させる。したがって、Ｃ
ｒ含有量は２〜６wt％の範囲内で選ぶべきである。Cr: 2 to 6 wt% Cr has the property of precipitating Cr-rich carbide or carbonitride on the surface by carburizing or carbonitriding to increase the surface hardness and improve wear resistance. However, if the content is less than 2 wt%, the above effect cannot be obtained,
If the content exceeds wt%, net-like carbides and giant carbides precipitate on the surface, and the rolling fatigue life is reduced. Therefore, C
The r content should be chosen in the range of 2-6% by weight.
【００１２】また、上記において、Ｃ、Ｓｉ、Ｍｎおよ
びＣｒを所定量含有する鋼に施す浸炭窒化熱処理の１例
として、たとえば８００〜９００℃の温度範囲で２〜６
時間浸炭窒化処理を施して油冷した後、１５０〜３００
℃の温度範囲で１〜３時間焼戻し処理を施す処理を挙げ
ることができる。なお、この場合、表面部の残留オース
テナイト量は２０〜４０vol ％となり、転がり疲労寿命
に影響する剥離に繋がる微小亀裂の発生、進展を抑制す
ることができる。In the above description, as an example of the carbonitriding heat treatment applied to steel containing predetermined amounts of C, Si, Mn and Cr, for example, a temperature range of 800 to 900 ° C. and 2 to 6
After carbonitriding for an hour and oil-cooled, 150-300
Tempering treatment in a temperature range of 1 to 3 hours. In this case, the amount of retained austenite on the surface is 20 to 40 vol%, and it is possible to suppress the generation and propagation of microcracks that lead to peeling that affect rolling fatigue life.
【００１３】転がり軸受部品の内部硬さをロックウェル
Ｃ硬さで４５以上に限定したのは、転がり疲労寿命が向
上するとともに、全体の剛性が向上するからである。[0013] The internal hardness of the rolling bearing component is limited to 45 or more in Rockwell C hardness, with the rolling fatigue life is improved, because the rigidity of the whole is improved.
【００１４】また、転がり軸受部品の表面硬さを、内部
硬さよりもロックウェルＣ硬さで５〜１５大きいものに
限定した理由は、次の通りである。すなわち、この硬度
差が５未満であると十分な靭性が得られず、１５を越え
ると剛性が低下して転がり疲労寿命が低下するからであ
る。Further, the surface hardness of the rolling bearing component, was limited to 5 to 15 larger in Rockwell C hardness than internal hardness reason is as follows. That is, if the hardness difference is less than 5, sufficient toughness cannot be obtained, and if it exceeds 15, the rigidity is reduced and the rolling fatigue life is reduced.
【００１５】[0015]
【実施例】以下、この発明の実施例を比較例とともに示
す。EXAMPLES Examples of the present invention will be described below together with comparative examples.
【００１６】表１に示す組成の鋼を用意し、各鋼から通
常の方法で軸受部品半製品を形成した。ついで、軸受部
品半製品に、８５０℃×５時間浸炭窒化処理を施して油
冷した後、１８０〜２２０℃×２時間焼戻し処理を施
し、転がり軸受部品を製造した。そして、表面のロック
ウェルＣ硬さ(HRC) 、内部のロックウェルＣ硬さ(HRC)
および表面部の残留オーステナイト量を測定した。ま
た、各転がり軸受部品を用いて転がり軸受を組み立てて
寿命試験を行い、比較例５の転がり疲労寿命を１とした
場合の寿命比を求めた。試験条件は、荷重：０．６Ｃkg
f （Ｃ：動定格荷重）、回転数：２５０rpm 、潤滑：タ
ービン油＃６８の油浴中である。これらの結果を表１に
まとめて示す。Steels having the compositions shown in Table 1 were prepared, and semi-finished bearing parts were formed from each steel by a conventional method. Then, the bearing part blank, after cooling oil is subjected to 850 ° C. × 5 hours carbonitriding, subjected to 180 to 220 ° C. × 2 hours tempering treatment, to produce the bearing parts rolling. And the surface Rockwell C hardness (HRC), the internal Rockwell C hardness (HRC)
And the amount of retained austenite on the surface was measured. Also conducted life tests assembled rolling bearing using the rolling bearing component to determine the life ratio of the case of the 1 the rolling fatigue life of Comparative Example 5. The test conditions were as follows: Load: 0.6 Ckg
f (C: dynamic load rating), number of revolutions: 250 rpm, lubrication: in an oil bath of turbine oil # 68. These results are summarized in Table 1.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【発明の効果】この発明の転がり軸受部品は、Ｃ：０．
４〜０．８wt％、Ｓｉ：０．１５〜０．５０wt％、Ｍ
ｎ：０．１５〜１．０wt％、Ｃｒ：２〜６wt％を含有
し、残部Ｆｅおよび不可避不純物からなる鋼よりなるの
で、転がり疲労寿命が向上するとともに、表面硬さが増
大して耐摩耗性が向上し、しかも被切削性および機械加
工性の低下が防止される。また、浸炭処理または浸炭窒
化熱処理が施されて内部硬さがロックウェルＣ硬さで４
５以上とされているので、剛性が向上する。さらに、内
部硬さがロックウェルＣ硬さで４５以上とされており、
かつ表面硬さが内部硬さよりもロックウェルＣ硬さで５
〜１５大きくなされているので、靭性および剛性が向上
するとともに、転がり疲労寿命が向上する。According to the present invention a rolling bearing components of this invention, C: 0.
4 to 0.8 wt%, Si: 0.15 to 0.50 wt%, M
n: 0.15 to 1.0% by weight, Cr: 2 to 6% by weight, and made of steel consisting of the balance of Fe and unavoidable impurities, so that the rolling fatigue life is improved, and the surface hardness is increased, resulting in wear resistance. The cutting performance and the machinability are prevented from lowering. In addition, carburizing treatment or carbonitriding heat treatment is performed, and the internal hardness is 4
Since it is 5 or more, the rigidity is improved. Furthermore, the internal hardness is 45 or more in Rockwell C hardness,
And the surface hardness is 5 in Rockwell C hardness than the internal hardness
Since it is increased by ~ 15, the toughness and rigidity are improved, and the rolling fatigue life is improved.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ２３Ｃ 8/22 Ｃ２３Ｃ 8/22 Ｆ１６Ｃ 33/62 Ｆ１６Ｃ 33/62 (58)調査した分野(Int.Cl.7，ＤＢ名) C23C 8/32,8/22 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 identification code FI C23C 8/22 C23C 8/22 F16C 33/62 F16C 33/62 (58) Investigated field (Int.Cl. 7 , DB name) C23C 8 / 32,8 / 22
Claims (1)
〜０．５０wt％、Ｍｎ：０．１５〜１．０wt％、Ｃｒ：
２〜６wt％を含有し、残部Ｆｅおよび不可避不純物から
なる鋼よりなり、浸炭処理または浸炭窒化熱処理が施さ
れて内部硬さがロックウェルＣ硬さで４５以上とされ、
かつ表面硬さが内部硬さよりもロックウェルＣ硬さで５
〜１５大きくなされている転がり疲労寿命に優れた転が
り軸受部品。1. C: 0.4-0.8 wt%, Si: 0.15
-0.50 wt%, Mn: 0.15-1.0 wt%, Cr:
A steel containing 2 to 6 wt%, the balance being Fe and unavoidable impurities, being subjected to a carburizing treatment or a carbonitriding heat treatment to have an internal hardness of 45 or more in Rockwell C hardness,
And the surface hardness is 5 in Rockwell C hardness than the internal hardness
Rolling excellent in rolling fatigue life which has been increased by ~ 15
Bearing components Ri.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3105507A JP3051944B2 (en) | 1991-05-10 | 1991-05-10 | Rolling bearing parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3105507A JP3051944B2 (en) | 1991-05-10 | 1991-05-10 | Rolling bearing parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04333558A JPH04333558A (en) | 1992-11-20 |
| JP3051944B2 true JP3051944B2 (en) | 2000-06-12 |
Family
ID=14409516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3105507A Expired - Fee Related JP3051944B2 (en) | 1991-05-10 | 1991-05-10 | Rolling bearing parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3051944B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5982846B2 (en) * | 2012-02-08 | 2016-08-31 | 日本精工株式会社 | Rolling support device |
-
1991
- 1991-05-10 JP JP3105507A patent/JP3051944B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 社団法人日本金属学会編「改訂４版金属便覧」（昭和６１年４月２０日第２刷発行 丸善）第５４６−５５１頁 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04333558A (en) | 1992-11-20 |
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