JP2005076077A - 軸受部品、その熱処理方法、熱処理装置および転がり軸受 - Google Patents
軸受部品、その熱処理方法、熱処理装置および転がり軸受 Download PDFInfo
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Abstract
【解決手段】 軸受部品の鋼をA1変態点を超える温度T1で熱処理した後、A1変態点未満の温度に冷却し、その後、A1変態点以上で上記熱処理の温度T1未満の焼入れ温度域に再加熱し、焼入れを行い、かつその焼入れは焼入れ強烈度0.1cm-1以上の冷却媒体を用いて行なう。
【選択図】 図1
Description
(A材:比較例):普通焼入れのみ(浸炭窒化処理せず)。
(B材:比較例):浸炭窒化処理後にそのまま焼き入れる(従来の浸炭窒化焼入れ)。
(C材:本発明例):図1の熱処理パターンを施した軸受鋼。
転動疲労寿命試験の試験条件および試験装置の略図を、表2および図9に示す。つまり、φ12×L22の円筒形状の試験片1を、案内輪12に接する剛球13と駆動輪11との間で支持した状態で駆動輪11を回転駆動させ、そのときの寿命(L10寿命)を測定することにより行なった。またこの転動疲労寿命試験結果を表3に示す。
シャルピー衝撃試験は、Uノッチ試験片を用いて、JISZ2242に準じた方法により行なった。試験結果を表4に示す。
静的破壊靭性試験の試験片には、図10に示す試験体を用い、予き裂を約1mm導入した後に、3点曲げによる静的荷重を加え、破壊荷重Pを求めた。破壊靭性値(KIc値)の算出には次に示す(I)式を用いた。ただし、(I)式におけるBは試験片の厚みである。また、試験結果を表5に示す。
KIc=(PL√a/BW2){5.8-9.2(a/W)+43.6(a/W)2-75.3(a/W)3+77.5(a/W)4}…(I)
静圧壊強度試験片は図11に示す形状のものを用いた。図中、P方向に荷重を付加して、静圧壊強度試験を行なった。試験結果を表6に示す。
保持温度130℃、保持時間500時間における経年寸法変化率の測定結果を、表面硬度、残留オーステナイト量(0.1mm深さ)と併せて表7に示す。
玉軸受6206を用い、標準異物を所定量混入させた異物混入潤滑下での転動疲労寿命を評価した。試験条件を表8に、また試験結果を表9に示す。
Claims (9)
- 軸受部品の熱処理方法であって、前記軸受部品の鋼のA1変態点を超える温度で熱処理した後、A1変態点未満の温度に冷却し、その後、前記A1変態点以上で前記熱処理の温度未満の焼入れ温度域に再加熱し、焼入れを行い、かつ前記焼入れは焼入れ強烈度0.1cm-1以上の冷却媒体を用いて行なう、軸受部品の熱処理方法。
- 前記A1変態点を超える温度での熱処理が浸炭窒化処理であって、前記焼入れ温度域が790℃〜830℃の温度域である、請求項1に記載の軸受部品の熱処理方法。
- 前記請求項1または2に記載の軸受部品の熱処理方法が行われ、オーステナイト結晶粒の粒度番号が10番を超える、軸受部品。
- 前記軸受部品の鋼が、浸炭窒化処理された表層以外の部分で、炭素を0.6〜1.2重量%、ケイ素を0.15〜1.1重量%、マンガンを0.3〜1.5重量%含む、請求項3に記載の軸受部品。
- 前記軸受部品の鋼が、さらに、2.0重量%以下のクロムを含む、請求項4に記載の軸受部品。
- 前記オーステナイト結晶粒が整粒から構成される、請求項3〜5のいずれかに記載の軸受部品。
- 前記軸受部品が、転がり軸受における軌道輪および転動体の少なくとも一方である、請求項3〜6のいずれかに記載の軸受部品。
- 前記請求項3〜7のいずれかの軸受部品を含む、転がり軸受。
- 前記請求項1または2に記載の熱処理方法に用いられる熱処理装置であって、無限軌道状に前記軸受部品を連続的に前方側から後方側へと搬送する搬送部と、前記前方側と後方側との間に位置し、前記搬送される軸受部品を前記熱処理の温度未満の焼入れ温度域に再加熱する加熱手段を備える本体部と、前記本体部の後方側に配置され、前記搬送部から送り出される前記軸受部品を焼き入れる冷却媒体を貯留するための冷却媒体槽とを備えた、熱処理装置。
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007177288A (ja) * | 2005-12-28 | 2007-07-12 | Nsk Ltd | 転がり支持装置及びその転動部材の製造方法 |
CN100425736C (zh) * | 2005-11-30 | 2008-10-15 | 重庆长江轴承股份有限公司 | 高碳铬轴承零件表面化学热处理工艺 |
WO2011122371A1 (ja) * | 2010-03-30 | 2011-10-06 | Ntn株式会社 | 転がり軸受 |
CN103540726A (zh) * | 2013-09-25 | 2014-01-29 | 西安交通大学 | 一种超高碳型轴承钢的热处理方法 |
JP2017141479A (ja) * | 2016-02-08 | 2017-08-17 | 日新製鋼株式会社 | 焼入れ中炭素鋼部品の製造方法 |
-
2003
- 2003-08-29 JP JP2003307171A patent/JP4152281B2/ja not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100425736C (zh) * | 2005-11-30 | 2008-10-15 | 重庆长江轴承股份有限公司 | 高碳铬轴承零件表面化学热处理工艺 |
JP2007177288A (ja) * | 2005-12-28 | 2007-07-12 | Nsk Ltd | 転がり支持装置及びその転動部材の製造方法 |
WO2011122371A1 (ja) * | 2010-03-30 | 2011-10-06 | Ntn株式会社 | 転がり軸受 |
JP2011208745A (ja) * | 2010-03-30 | 2011-10-20 | Ntn Corp | 転がり軸受 |
CN102741572A (zh) * | 2010-03-30 | 2012-10-17 | Ntn株式会社 | 滚动轴承 |
CN103540726A (zh) * | 2013-09-25 | 2014-01-29 | 西安交通大学 | 一种超高碳型轴承钢的热处理方法 |
CN103540726B (zh) * | 2013-09-25 | 2015-08-05 | 西安交通大学 | 一种超高碳型轴承钢的热处理方法 |
JP2017141479A (ja) * | 2016-02-08 | 2017-08-17 | 日新製鋼株式会社 | 焼入れ中炭素鋼部品の製造方法 |
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