JPH02115344A - Steel for bearing and its manufacture - Google Patents
Steel for bearing and its manufactureInfo
- Publication number
- JPH02115344A JPH02115344A JP26667588A JP26667588A JPH02115344A JP H02115344 A JPH02115344 A JP H02115344A JP 26667588 A JP26667588 A JP 26667588A JP 26667588 A JP26667588 A JP 26667588A JP H02115344 A JPH02115344 A JP H02115344A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- treatment
- surface hardness
- retained austenite
- carburized
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 26
- 239000010959 steel Substances 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 26
- 238000005496 tempering Methods 0.000 claims abstract description 15
- 238000005255 carburizing Methods 0.000 claims abstract description 11
- 150000001247 metal acetylides Chemical group 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 230000000717 retained effect Effects 0.000 abstract description 18
- 238000010791 quenching Methods 0.000 abstract description 6
- 230000000171 quenching effect Effects 0.000 abstract description 6
- 238000001556 precipitation Methods 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract 3
- 239000003921 oil Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 238000005256 carbonitriding Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/64—Special methods of manufacture
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、軸受用鋼およびその製造方法、さら嶋詳し
くは、異物が混入した汚れ油中で使用される軸受に適し
た鋼およびその製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a steel for bearings and a method for manufacturing the same, and more particularly, to a steel suitable for bearings used in dirty oil contaminated with foreign matter and a method for manufacturing the same. .
従来の技術および発明の課題
一般に、軸受を金属粉、鋳物砂などの異物が混入した汚
れ油中で使用すると、その寿命は計算寿命の１１５〜１
／１０以下になる。PRIOR ART AND PROBLEM TO BE SOLVED BY THE INVENTION In general, when bearings are used in dirty oil mixed with foreign substances such as metal powder and foundry sand, their lifespan is 115 to 11% of the calculated lifespan.
/10 or less.
このため、密封軸受として異物の侵入を防いだり、浸炭
鋼を用いて表面部の残留オーステナイト量を増加させた
り内部硬さを高くして、寿命向上を図ることが行なわれ
ている。For this reason, attempts are being made to extend the life of bearings by using sealed bearings to prevent foreign matter from entering, by using carburized steel to increase the amount of retained austenite on the surface, and by increasing internal hardness.
ところが、密封軸受の場合は、回転に要するトルクが増
大するという問題があり、たとえば、円すいころ軸受で
は、密封構造とするのが難しい。また、残留オーステナ
イト量の増加と内部硬さの増加だけでは、寿命向上は不
十分である。However, in the case of a sealed bearing, there is a problem that the torque required for rotation increases, and for example, it is difficult to provide a sealed structure with a tapered roller bearing. Furthermore, increasing the amount of retained austenite and increasing internal hardness alone are insufficient to improve life.
この発明の目的は、上記の問題を解決し、汚れ油中でも
寿命が長い軸受用鋼およびその製造方法を提供すること
にある。An object of the present invention is to solve the above problems and provide a bearing steel that has a long life even in dirty oil and a method for manufacturing the same.
課題を解決するための手段
この発明による軸受用鋼は、浸炭鋼よりなり、表面硬さ
ＨＲＣ６３〜６６、表面残留オーステナイトｆｆ１２５
〜５０％で、かつ浸炭層中に二次炭化物が析出していな
いことを特徴とするモノマある。Means for Solving the Problems The steel for a bearing according to the present invention is made of carburized steel, has a surface hardness of HRC63 to 66, and a surface residual austenite of ff125.
50% and no secondary carbide is precipitated in the carburized layer.
この発明による軸受用鋼の製造方法は、浸炭処理、予備
焼戻し処理、サブゼロ処理およヒ焼戻し処理を順に施し
、表面硬さＨＲＣ６３〜６６、表面残留オーステナイト
量２５〜５０％、望ましくは３０〜５０％とし、かつ浸
炭層中に二次炭化物を析出させないようにすることを特
徴とするものである。The method for producing steel for bearings according to the present invention includes sequentially carburizing, pre-tempering, sub-zero treatment and heat-tempering to achieve a surface hardness of HRC 63-66 and a surface residual austenite content of 25-50%, preferably 30-50%. %, and is characterized by preventing the precipitation of secondary carbides in the carburized layer.
発明の作用および効果
浸炭処理後、予備焼戻し処理を行なったのちにサブゼロ
処理を行なうので、所望の残留オーステナイト量が得ら
れる。すなわち、浸炭処理後に予備焼戻し処理を行なわ
ないでサブゼロ処理を行なった場合、オーステナイトが
分解してマルテンサイトになりやすく、残留オーステナ
イト量が少なくなるが、予備焼戻しを行なうことにより
、浸炭処理後の不安定な残留オーステナイトが安定化し
、サブゼロ処理を行なってもマルテンサイトになりにく
くなる。Functions and Effects of the Invention Since the sub-zero treatment is performed after the carburizing treatment and the preliminary tempering treatment, the desired amount of retained austenite can be obtained. In other words, if subzero treatment is performed without pre-tempering after carburizing, austenite tends to decompose into martensite and the amount of residual austenite decreases, but pre-tempering reduces the amount of residual austenite after carburizing. Stable retained austenite is stabilized and becomes less likely to turn into martensite even after sub-zero treatment.
予備焼戻し後にサブゼロ処理を行なうことにより、二次
炭化物を析出させずに、所望の表面硬さが得られる。す
なわち、浸炭処理後、所望の表面硬さを得るために一般
に二次焼入れが行なわれるが、これにより二次炭化物が
析出する。By performing subzero treatment after preliminary tempering, desired surface hardness can be obtained without precipitating secondary carbides. That is, after carburizing treatment, secondary quenching is generally performed to obtain a desired surface hardness, but secondary carbide precipitates as a result.
また、浸炭処理後に生じる歪を除去するため加熱矯正が
行なわれる場合があるが、これは金属組織的には二次焼
入れと同じ処理であり、二次炭化物が析出すると同時に
表面硬さも上昇する。In addition, heat straightening is sometimes performed to remove distortion that occurs after carburizing, but this is the same treatment as secondary quenching from a metallographic perspective, and the surface hardness increases at the same time as secondary carbides precipitate.
ところが、本発明の場合、浸炭処理後、加熱矯正や二次
焼入れは行なわず、二次炭化物は析出しない。所望の表
面硬さは、サブゼロ処理によって得る。However, in the case of the present invention, heat straightening and secondary quenching are not performed after carburizing treatment, and no secondary carbide is precipitated. The desired surface hardness is obtained by sub-zero treatment.
この発明による軸受用鋼は、浸炭鋼よりなり、表面硬さ
ＩＩＲｃ ６３〜６６、表面残留オーステナイトｆｆ１
２５〜５０％、望ましくは３０〜５０％であるから、汚
れ油中でも寿命が長くなる。すなわち、表面硬さが高い
ので、剥離起点となる異物による傷がつきに＜＜、また
残留オーステナイトｆｆｉが多いので、亀裂の進展が抑
制される。The bearing steel according to the present invention is made of carburized steel, has a surface hardness of IIRc 63 to 66, and has surface residual austenite ff1.
Since it is 25 to 50%, preferably 30 to 50%, it has a long life even in dirty oil. That is, since the surface hardness is high, scratches caused by foreign substances that become peeling starting points are less likely to occur, and since there is a large amount of retained austenite ffi, the propagation of cracks is suppressed.
実施例
次に、上記効果を実証するために、この発明の実施例を
例示する。Examples Next, examples of the present invention will be illustrated in order to demonstrate the above effects.
まず、一般の浸炭鋼を９３０℃に保持して浸炭を行なっ
たのちに８５０℃の焼入れ温度に降温して焼入れする通
常の浸炭焼入れ処理を行なった。処理後の表面硬さは１
（ＲＣ６０、残留オーステナイト量は６１％であった。First, ordinary carburized steel was carburized while being held at 930°C, and then the temperature was lowered to a quenching temperature of 850°C for quenching. Surface hardness after treatment is 1
(RC60, retained austenite amount was 61%.
次に、１５０℃に３０分間保持したのちに空冷する予備
焼戻し処理を行なった。次に、−６０℃に保持したのち
に空冷するサブゼロ処理を行なった。処理後の表面硬さ
はＨＲＣ６６、残留オーステナイト量は３５％であった
。最後に、１６０℃に保持したのちに空冷する焼戻し処
理を行なった。処理後の表面硬さはＨＲＣ６，５、残留
オーステナイト量は３０％であり、二次炭化物は析出し
ていなかった。Next, a preliminary tempering process was performed in which the sample was held at 150° C. for 30 minutes and then air cooled. Next, a sub-zero process was performed in which the temperature was maintained at -60°C and then air cooled. The surface hardness after treatment was HRC66, and the amount of retained austenite was 35%. Finally, a tempering treatment was performed in which the material was held at 160° C. and then air cooled. The surface hardness after treatment was HRC 6.5, the amount of retained austenite was 30%, and no secondary carbides were precipitated.
また、一般の浸炭鋼に通常の浸炭窒化処理を施した。処
理後の表面硬さはＨＲＣ５７、残留オーステナイト量は
７４％であった。次に、上記と同じ予備焼戻し処理、サ
ブゼロ処理および焼戻し処理を順に行なった。サブゼロ
処理後の表面硬さはＨＲＣ６５、残留オーステナイト量
は４３％であった。また、焼戻し処理後の表面硬さは１
ＩＲｃ６４、残留オーステナイト量は４０％であり、二
次炭化物は析出していなかった。In addition, ordinary carburized steel was subjected to ordinary carbonitriding treatment. The surface hardness after treatment was HRC57, and the amount of retained austenite was 74%. Next, the same preliminary tempering treatment, sub-zero treatment, and tempering treatment as above were performed in this order. The surface hardness after sub-zero treatment was HRC65, and the amount of retained austenite was 43%. In addition, the surface hardness after tempering treatment is 1
IRc was 64, the amount of retained austenite was 40%, and no secondary carbide was precipitated.
本発明の軸受用鋼（表面硬さＨＲＣ６４，５で残留オー
ステナイト量４０％のものおよび表面硬さＩＩＲＣ６４
，０で残留オーステナイト量２５％のもの）を使用した
円すいころ軸受（実施例）と通常の軸受用鋼を使用した
円すいころ軸受（比較例）を準備し、これらについて寿
命試験を行なった。この試験は、潤滑油１／中に高速度
鋼砂粉１．０６ｇを混入して行なった。Steel for bearings of the present invention (surface hardness HRC64.5 and retained austenite content 40% and surface hardness IIRC64)
A tapered roller bearing (example) using a steel with a retained austenite content of 25% and a tapered roller bearing (comparative example) using normal bearing steel were prepared, and a life test was conducted on them. This test was conducted by mixing 1.06 g of high-speed steel sand powder in 1/2 lubricating oil.
試験の結果、汚れ油中でのＢＩＧ寿命が実施例では比較
例の約２倍になることがわかった。As a result of the test, it was found that the BIG life in dirty oil was approximately twice as long in the example as in the comparative example.
また、次の表に示すような８種類の試料（円すいころ軸
受）を作り、これらについて、同様に汚れ油中での寿命
試験を行なった。In addition, eight types of samples (tapered roller bearings) as shown in the following table were prepared, and a life test in dirty oil was similarly conducted on these samples.
試験結果を第１図〜第３図に示す。なお、これらの図面
において、点のそばの数字は試料番号を示す。The test results are shown in FIGS. 1 to 3. In addition, in these drawings, the number next to the dot indicates the sample number.
第１図は、全ての試料について、二次炭化物の有無と寿
命比Ｂ＋ｏ／Ｌ＋。（実際のＥ３ｉｏ寿命と計算寿命り
、。の比）との関係を示すものである。Figure 1 shows the presence or absence of secondary carbides and the life ratio B+o/L+ for all samples. (The ratio of the actual E3io lifespan and the calculated lifespan.)
第２図は、二次炭化物のない試料について、表面硬さと
Ｂ Ｉｏ／ Ｌ ｒ ｏとの関係を示すものである。FIG. 2 shows the relationship between surface hardness and B Io/L r o for samples without secondary carbides.
第３図は、表面硬さが高くて二次炭化物のない試料につ
いて、残留オーステナイト量と８１゜／Ｌｌｏとの関係
を示すものである。FIG. 3 shows the relationship between the amount of retained austenite and 81°/Llo for a sample with high surface hardness and no secondary carbides.
これらの結果より、試料１および２は、他の試料に比べ
て、汚れ油中での寿命が長いことがわかる。These results show that Samples 1 and 2 have a longer lifespan in dirty oil than the other samples.
発明の効果
この発明によれば、上述のように、汚れ油中においても
軸受の寿命を向上させることが可能である。Effects of the Invention According to the present invention, as described above, it is possible to improve the life of the bearing even in dirty oil.
図面は試験結果を示し、第１図は二次炭化物の有無と寿
命比Ｂ１゜／ Ｌ ＋。の関係を示すグラフ、第２図は
表面硬さと８１゜／Ｌｌｏの関係を示すグラフ、第３図
は残留オーステナイト量とＢｏｏ／ＬＩＯの関係を示す
グラフである。
以 上
特許出願人 光洋精工株式会社The drawings show the test results, and Figure 1 shows the presence or absence of secondary carbides and the life ratio B1°/L+. 2 is a graph showing the relationship between surface hardness and 81°/Llo, and FIG. 3 is a graph showing the relationship between the amount of retained austenite and Boo/LIO. Patent applicant: Koyo Seiko Co., Ltd.
Claims (2)
面残留オーステナイト量２５〜５０％で、かつ浸炭層中
に二次炭化物が析出していないことを特徴とする軸受用
鋼。(1) A bearing steel made of carburized steel, having a surface hardness of HRC 63 to 66, a surface residual austenite content of 25 to 50%, and no secondary carbide precipitated in the carburized layer.
処理および焼戻し処理を順に施し、表面硬さＨＲＣ６３
〜６６、表面残留オーステナイト量２５〜５０％とし、
かつ浸炭層中に二次炭化物を析出させないようにするこ
とを特徴とする軸受用鋼の製造方法。(2) Carburized steel is subjected to carburizing treatment, preliminary tempering treatment, sub-zero treatment, and tempering treatment in order, and the surface hardness is HRC63.
~66, the amount of surface residual austenite is 25 to 50%,
A method for manufacturing bearing steel, characterized in that secondary carbides are not precipitated in the carburized layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63266675A JP2733608B2 (en) | 1988-10-21 | 1988-10-21 | Bearing steel and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63266675A JP2733608B2 (en) | 1988-10-21 | 1988-10-21 | Bearing steel and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02115344A true JPH02115344A (en) | 1990-04-27 |
| JP2733608B2 JP2733608B2 (en) | 1998-03-30 |
Family
ID=17434133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63266675A Expired - Lifetime JP2733608B2 (en) | 1988-10-21 | 1988-10-21 | Bearing steel and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2733608B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5336338A (en) * | 1991-12-03 | 1994-08-09 | Koyo Seiko Co., Ltd. | Bearing components and process for producing same |
| US6380117B2 (en) | 1998-06-16 | 2002-04-30 | Ngk Spark Plug Co., Ltd. | Dielectric material and process for producing the same |
| US7484894B2 (en) | 2005-08-18 | 2009-02-03 | Jtekt Corporation | Tapered roller bearing an automotive pinion shaft supporting apparatus utilizing same tapered roller bearing |
| JP2015182436A (en) * | 2014-03-26 | 2015-10-22 | セイコーエプソン株式会社 | Printer, and printing method |
-
1988
- 1988-10-21 JP JP63266675A patent/JP2733608B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5336338A (en) * | 1991-12-03 | 1994-08-09 | Koyo Seiko Co., Ltd. | Bearing components and process for producing same |
| EP0861907A2 (en) * | 1991-12-03 | 1998-09-02 | Koyo Seiko Co., Ltd. | Process for producing a bearing component |
| EP0861907A3 (en) * | 1991-12-03 | 1998-10-14 | Koyo Seiko Co., Ltd. | Process for producing a bearing component |
| US6380117B2 (en) | 1998-06-16 | 2002-04-30 | Ngk Spark Plug Co., Ltd. | Dielectric material and process for producing the same |
| US7484894B2 (en) | 2005-08-18 | 2009-02-03 | Jtekt Corporation | Tapered roller bearing an automotive pinion shaft supporting apparatus utilizing same tapered roller bearing |
| JP2015182436A (en) * | 2014-03-26 | 2015-10-22 | セイコーエプソン株式会社 | Printer, and printing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2733608B2 (en) | 1998-03-30 |
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