JP4642490B2 - Manufacturing method of thin-walled bearing member for bearing - Google Patents

Manufacturing method of thin-walled bearing member for bearing Download PDF

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JP4642490B2
JP4642490B2 JP2005016809A JP2005016809A JP4642490B2 JP 4642490 B2 JP4642490 B2 JP 4642490B2 JP 2005016809 A JP2005016809 A JP 2005016809A JP 2005016809 A JP2005016809 A JP 2005016809A JP 4642490 B2 JP4642490 B2 JP 4642490B2
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JP2006206929A (en
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喜久男 前田
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本発明は軸受用薄肉軌道部材およびスラスト軸受に関し、より特定的には焼入硬化して使用され、軸受の転動体が接触する表面である転走面を構成する部分の厚さが３ｍｍ以下である軸受用薄肉軌道部材およびその軸受用薄肉軌道部材を備えたスラスト軸受に関する。   The present invention relates to a thin bearing member for a bearing and a thrust bearing, and more specifically, is used after being hardened by hardening, and a thickness of a portion constituting a rolling surface, which is a surface to which a rolling element of the bearing contacts, is 3 mm or less. The present invention relates to a thin bearing member for a bearing and a thrust bearing provided with the thin race member for the bearing.

軸受が使用される自動車などの製品はますます高性能化、高機能化している。このような状況の下、軸受に対しても高性能化、たとえば長寿命化が求められている。また、軸受は衝撃荷重が負荷され得る部位に使用される場合もあり、靭性の向上も求められている。さらに、価格競争力向上の観点から、軸受にも低価格化が求められている。   Products such as automobiles that use bearings are becoming more sophisticated and functional. Under such circumstances, the bearings are also required to have higher performance, for example, longer life. Further, the bearing is sometimes used in a part where an impact load can be applied, and an improvement in toughness is also required. Furthermore, from the viewpoint of improving price competitiveness, bearings are also required to be reduced in price.

一方、軸受に使用される軸受用薄肉軌道部材はその製造工程における焼入の際、変形を生じやすい。軌道部材の変形が大きい場合、その軌道部材を備えた軸受は寿命が低下する。   On the other hand, thin bearing members for bearings used in bearings are likely to be deformed during quenching in the manufacturing process. When the deformation of the race member is large, the life of the bearing provided with the race member is reduced.

鋼材を焼入れる際の鋼材の変形を抑制する方法として、鋼板をプレス焼入する際の鋼板表面のスケール厚を１０μｍ以下とする方法が提案されている。これにより、形状精度のよい成形部品を製造することができる（たとえば特許文献１参照）。また、鋼材のプレス焼入法において、鋼材を金型を用いて拘束した状態で冷却液の中に浸漬する方法が提案されている（たとえば特許文献２参照）。これにより、焼入の際に発生する変形や曲がりを高硬度の鋼材においても低減することができる。また、薄肉リングの外径と幅方向の端面とをコレット（拘束用部材）により拘束して焼入を行う方法が提案されている。これにより、焼入の際に発生する変形が抑制される（たとえば特許文献３参照）。
特開２００３−２３１９１５号公報 特開平７−１５７８２２号公報 特開平５−３３０６０号公報 As a method for suppressing deformation of the steel material when quenching the steel material, a method has been proposed in which the scale thickness of the steel sheet surface when press quenching the steel sheet is 10 μm or less. Thereby, a molded part with good shape accuracy can be manufactured (for example, refer to Patent Document 1). Moreover, in the press hardening method of steel materials, the method of immersing in a cooling fluid in the state which restrained steel materials using the metal mold | die is proposed (for example, refer patent document 2). Thereby, the deformation | transformation and bending which generate | occur | produce in the case of hardening can be reduced also in high hardness steel materials. Further, a method has been proposed in which quenching is performed by constraining the outer diameter of the thin ring and the end face in the width direction with a collet (constraining member). Thereby, the deformation | transformation which generate | occur | produces in the case of quenching is suppressed (for example, refer patent document 3).
JP 2003-231915 A JP-A-7-157822 JP-A-5-33060

しかし、上述の焼入の際に発生する変形を抑制する方法を軸受用薄肉軌道部材に適用して軸受を作製した場合でも、近年の高い要求特性を考慮すれば軸受の寿命は十分とはいえない。また、前述のように衝撃荷重に対する対策も必要である。さらに、これらの対策によりコストが上昇すれば、前述の低価格化の要求に反するものとなる。   However, even when a bearing is manufactured by applying the above-described method for suppressing deformation that occurs during quenching to a thin-walled bearing member for bearings, the life of the bearing is sufficient, considering the recent high required characteristics. Absent. Further, as described above, measures against impact loads are also necessary. Furthermore, if the cost increases as a result of these measures, it goes against the above-mentioned demand for lower prices.

そこで、本発明の目的は長寿命かつ靭性に優れ、同時に低コストな軸受を構成可能な軸受用薄肉軌道部材およびその軸受用薄肉軌道部材を備えたスラスト軸受を提供することである。   Accordingly, an object of the present invention is to provide a thin-walled bearing member for a bearing that can provide a long-life and toughness and at the same time constitute a low-cost bearing, and a thrust bearing including the thin-walled bearing member for the bearing.

本発明に従った軸受用薄肉軌道部材は、焼入硬化して使用され、軸受の転動体が接触する表面である転走面を構成する部分の厚さが３ｍｍ以下である軸受用薄肉軌道部材である。軸受用薄肉軌道部材の水素含有量は０．３ｐｐｍ以下であり、かつ転走面の転動体が接触する部分の表面の硬さは７００ＨＶ以上である。   The thin-walled bearing member for bearings according to the present invention is used after being hardened and hardened, and the thin-walled bearing member for bearings in which the thickness of the portion constituting the rolling surface, which is the surface that contacts the rolling elements of the bearing, is 3 mm or less It is. The hydrogen content of the bearing thin bearing member is 0.3 ppm or less, and the surface hardness of the portion of the rolling contact surface that is in contact with the rolling elements is 700 HV or more.

本発明者は以下のように軸受用薄肉軌道部材の水素含有量と軸受の寿命および靭性との関係について鋭意検討し、本発明に想到した。   The present inventor diligently studied the relationship between the hydrogen content of the bearing thin bearing member and the life and toughness of the bearing as described below, and arrived at the present invention.

一般に、軸受用薄肉軌道部材は低炭素鋼、たとえばＳＰＣＣ、ＳＣＭ４１５などを素材とし、これを軌道部材の形状に成形した後、浸炭焼入により焼入硬化して使用されている。また、高炭素鋼、たとえばＳＵＪ２、ＳＡＥ１０７０などを素材とし、これを軌道部材の形状に成形した後、雰囲気炉において加熱し、急冷することにより焼入硬化して使用されているものもある。ここで、上記焼入硬化で使用されるキャリアガスやエンリッチガスの原料であるプロパン（Ｃ３Ｈ８）やブタン（Ｃ４Ｈ１０）には水素が含まれている。そのため、上記の軌道部材には水素が侵入する。特に浸炭焼入が行われる場合、鋼中に炭素を浸入させる浸炭工程や浸入させた炭素を拡散させる拡散工程において、軌道部材は長時間高温ガス中に置かれるため、水素の浸入が多くなる。これに対し、本発明者は軌道盤の水素含有量を０．３ｐｐｍ以下とすることで軸受の寿命および軌道盤の靭性が著しく向上することを見出した。さらに、軸受の寿命を考慮すると軌道部材の転走面において転動体が接触する部分の表面の硬さは７００ＨＶ以上とすることが好ましい。したがって、本発明の軸受用薄肉軌道部材によれば、長寿命かつ靭性の高い軸受用薄肉軌道部材を提供することができる。 In general, the bearing thin bearing member is made of low carbon steel, such as SPCC, SCM415, etc., which is molded into the shape of the race member and then hardened and hardened by carburizing and quenching. In addition, some high-carbon steels such as SUJ2, SAE1070, etc. are used as materials, and after being formed into the shape of a raceway member, they are used by being hardened and hardened by heating in an atmosphere furnace and quenching. Here, propane (C 3 H 8 ) and butane (C 4 H 10 ), which are raw materials for the carrier gas and enriched gas used in the quench hardening, contain hydrogen. For this reason, hydrogen enters the raceway member. In particular, when carburizing and quenching is performed, the raceway member is placed in a high-temperature gas for a long time in a carburizing process for infiltrating carbon into steel and a diffusion process for diffusing the infiltrated carbon. In contrast, the present inventor has found that the life of the bearing and the toughness of the washer are significantly improved by setting the hydrogen content of the washer to 0.3 ppm or less. Furthermore, considering the life of the bearing, it is preferable that the hardness of the surface of the raceway member where the rolling elements come into contact with is 700 HV or more. Therefore, according to the thin track member for bearings of the present invention, a thin track member for bearings having a long life and high toughness can be provided.

上記軸受用薄肉軌道部材において好ましくは、軸受用薄肉軌道部材の材質は０．４質量％以上１．２質量％以下の炭素を含有する鋼である。焼入硬化を行う際の加熱は誘導加熱により行われている。   In the above thin bearing member for bearings, the material of the thin bearing member for bearings is preferably steel containing 0.4% by mass or more and 1.2% by mass or less of carbon. Heating when performing quench hardening is performed by induction heating.

鋼を焼入硬化した場合の硬さの上限は鋼の炭素含有量に依存する。軌道部材を焼入および焼戻した後に前述の７００ＨＶ以上の硬さを確保するためには炭素量は少なくとも０．４質量％以上必要である。一方、炭素量が多くなると素材の硬さが上昇し、炭素量が１．２質量％を超えると素材の加工性が悪くなる。また、炭素量が多くなると焼入後にマルテンサイト化せずに残留するオーステナイト（残留オーステナイト）が多くなる。残留オーステナイトは経年変化によりマルテンサイト化するため寸法変化を生ずるおそれがあり、炭素量が１．２質量％を超えると寸法精度が不十分となる可能性がある。さらに、炭素量が１．２質量％以上になると、軌道部材の靭性が劣化するおそれがある。したがって、炭素量を０．４質量％以上１．２質量％以下とすることで、軌道盤に必要な硬さ、靭性および素材の加工性を確保することができる。   The upper limit of the hardness when quenching and hardening steel depends on the carbon content of the steel. In order to ensure the above-described hardness of 700 HV or higher after quenching and tempering the raceway member, the carbon amount needs to be at least 0.4 mass%. On the other hand, when the carbon content increases, the hardness of the material increases, and when the carbon content exceeds 1.2% by mass, the workability of the material deteriorates. Further, when the amount of carbon increases, austenite (residual austenite) that remains without being martensite after quenching increases. Residual austenite becomes martensite due to secular change and may cause a dimensional change. If the carbon content exceeds 1.2 mass%, the dimensional accuracy may be insufficient. Furthermore, when the carbon content is 1.2% by mass or more, the toughness of the raceway member may be deteriorated. Therefore, the hardness, toughness, and workability of the material necessary for the washer can be ensured by setting the carbon amount to 0.4 mass% or more and 1.2 mass% or less.

また、焼入硬化を行う際の加熱が誘導加熱により行われる場合、軌道部材が高温ガス中に置かれる時間は一般的焼入硬化処理である浸炭熱処理、光輝熱処理等と比較して極めて短い。そのため、軌道部材への水素の浸入が少なくなる。その結果、軌道部材の靭性が高くなる。さらにこの軌道部材を軸受に用いることにより、長寿命な軸受を得ることができる。また、水素の浸入が少ないため、焼入硬化後に高温で焼戻を行って水素を除去する必要がなく、焼入焼戻後の軌道部材の硬さを確保することが容易となる。そのため、焼戻軟化抵抗の向上を目的とした合金元素の添加の必要性が小さく、安価な素材が使用できるため、軌道部材の低コスト化が可能となる。   In addition, when the heating at the time of quench hardening is performed by induction heating, the time during which the raceway member is placed in the high-temperature gas is extremely short compared to carburizing heat treatment, bright heat treatment, and the like, which are general quench hardening treatments. As a result, the penetration of hydrogen into the raceway member is reduced. As a result, the toughness of the raceway member is increased. Furthermore, a long-life bearing can be obtained by using this raceway member as a bearing. Further, since there is little hydrogen permeation, it is not necessary to remove the hydrogen by tempering at a high temperature after quenching and hardening, and it becomes easy to ensure the hardness of the raceway member after quenching and tempering. Therefore, the necessity of adding an alloy element for improving the temper softening resistance is small, and an inexpensive material can be used, so that the cost of the race member can be reduced.

上記軸受用薄肉軌道部材において好ましくは、軸受用薄肉軌道部材の材質は、０．１５質量％以上０．６質量％以下のＳｉ（ケイ素）と、０．６質量％以上１．３質量％以下のＭｎ（マンガン）と、０．１５質量％以上２質量％以下のＣｒ（クロム）とを含有する鋼である。   In the thin bearing member for a bearing, preferably, the material of the thin race member for a bearing is 0.15 mass% or more and 0.6 mass% or less of Si (silicon) and 0.6 mass% or more and 1.3 mass% or less. Mn (manganese) and 0.15% by mass or more and 2% by mass or less of Cr (chromium).

Ｓｉは転動疲労寿命を確保する観点から、０．１５質量％以上必要である。一方、Ｓｉ量が多くなると素材の硬さが上昇し、Ｓｉが０．６質量％を超えると素材の加工性が悪くなる。したがって、軸受用薄肉軌道部材の材質は、０．１５質量％以上０．６質量％以下のＳｉを含有する鋼であることが好ましい。また、Ｍｎは転動疲労寿命および焼入性を確保する観点から、０．６質量％以上必要である。一方、Ｍｎ量が多くなると素材の硬さが上昇し、Ｍｎ量が１．３質量％を超えると素材の加工性が悪くなる。また、Ｍｎ量が多くなると焼入焼戻後の残留オーステナイトが多くなり、Ｍｎ量が１．３質量％を超えると残留オーステナイト過多となる。したがって、軸受用薄肉軌道部材の材質は、０．６質量％以上１．３質量％以下のＭｎを含有する鋼であることが好ましい。また、Ｃｒは転動疲労寿命および焼入性を確保する観点から、０．１５質量％以上必要である。一方、Ｃｒ量が多くなると素材の硬さが上昇し、Ｃｒ量が２質量％を超えると素材の加工性が悪くなる。また、Ｃｒ量が多くなると素材のコストが上昇し、軸受に対する低コスト化の要求に応えることができない。したがって、軸受用薄肉軌道部材の材質は、０．１５質量％以上２質量％以下のＣｒを含有する鋼であることが好ましい。   Si needs to be 0.15% by mass or more from the viewpoint of securing the rolling fatigue life. On the other hand, when the amount of Si increases, the hardness of the material increases, and when Si exceeds 0.6 mass%, the workability of the material deteriorates. Therefore, the material of the thin bearing member for a bearing is preferably steel containing 0.15 mass% or more and 0.6 mass% or less of Si. Mn is required to be 0.6% by mass or more from the viewpoint of securing the rolling fatigue life and hardenability. On the other hand, when the amount of Mn increases, the hardness of the material increases, and when the amount of Mn exceeds 1.3% by mass, the workability of the material deteriorates. Moreover, when the amount of Mn increases, the amount of retained austenite after quenching and tempering increases, and when the amount of Mn exceeds 1.3% by mass, the amount of retained austenite becomes excessive. Therefore, the material of the bearing thin bearing member is preferably steel containing 0.6% by mass to 1.3% by mass of Mn. Further, Cr is required to be 0.15% by mass or more from the viewpoint of securing the rolling fatigue life and hardenability. On the other hand, when the Cr amount increases, the hardness of the material increases, and when the Cr amount exceeds 2 mass%, the workability of the material deteriorates. Further, when the amount of Cr increases, the cost of the material increases, and it is impossible to meet the demand for cost reduction of the bearing. Therefore, the material of the bearing thin bearing member is preferably steel containing 0.15% by mass or more and 2% by mass or less of Cr.

上記軸受用薄肉軌道部材において好ましくは、焼入硬化における冷却は、金型を用いて軸受用薄肉軌道部材を拘束しながら実施されている。冷却は軸受用薄肉軌道部材から熱を除去するための冷却部材として金型を用いることにより、軸受用薄肉軌道部材をＡｃ1点以上の温度からＭｓ点以下の温度に冷却することにより実施されている。 In the thin bearing member for a bearing, cooling in quench hardening is preferably performed while restraining the thin bearing member for a bearing using a mold. Cooling is carried out by cooling by using a mold as a cooling member for removing heat from the thin raceway member for bearing a thin track member bearing a temperature not lower than A c1 point to M s point below the temperature ing.

軌道部材を拘束しながら焼入硬化における冷却を実施することで、焼入硬化処理において発生する軌道部材の反りなどの変形を抑制することができる。これにより、焼入硬化後に反りの矯正などの工程が不要となる。その結果、製造工程が簡略化でき、軌道部材を低コスト化できる。また、冷却部材として金型を用いることで水、油などの冷却媒体に軌道部材を浸漬等して冷却する必要がない。そのため、焼入硬化後に軌道部材の表面に反応生成膜や油が存在しないので軌道部材の表面を洗浄する工程などを設ける必要がない。その結果、製造工程が簡略化でき、軌道部材を低コスト化することができる。 さらに、水、油などの冷却媒体を用いる必要がないため、たとえば水や油が高温の軌道部材と接触することによる水素の発生がなく、軌道部材への水素の浸入が抑制される。   By performing cooling in quench hardening while restraining the race member, deformation such as warpage of the race member that occurs in the quench hardening process can be suppressed. This eliminates the need for a process such as warping correction after quench hardening. As a result, the manufacturing process can be simplified and the cost of the race member can be reduced. In addition, by using a mold as the cooling member, there is no need to cool the track member by immersing it in a cooling medium such as water or oil. Therefore, since there is no reaction product film or oil on the surface of the race member after quench hardening, there is no need to provide a process for cleaning the surface of the race member. As a result, the manufacturing process can be simplified and the cost of the race member can be reduced. Furthermore, since it is not necessary to use a cooling medium such as water or oil, for example, there is no generation of hydrogen due to contact of water or oil with a high-temperature raceway member, and entry of hydrogen into the raceway member is suppressed.

なお、Ａｃ１点とは鋼を連続的に加熱する際に、鋼がフェライトからオーステナイトに変態を開始する温度に相当する点をいう。また、Ｍｓ点とはオーステナイト化した鋼が冷却される際に、マルテンサイト化を開始する温度に相当する点をいう。 The Ac1 point means a point corresponding to a temperature at which the steel starts to transform from ferrite to austenite when the steel is continuously heated. Further, the M s point means a point corresponding to a temperature at which martensite formation starts when the austenitized steel is cooled.

上記軸受用薄肉軌道部材において好ましくは、上記軸受用薄肉軌道部材はスラスト軸受の軌道盤として用いられる。   In the thin bearing member for a bearing, the thin bearing member for a bearing is preferably used as a bearing plate of a thrust bearing.

これにより、長寿命かつ靭性に優れ、同時に低コストなスラスト軸受を構成可能なスラスト軸受用薄肉軌道盤を提供することができる。   Accordingly, it is possible to provide a thin bearing washer for a thrust bearing capable of forming a thrust bearing having a long life and excellent toughness and at the same time at a low cost.

本発明に従ったスラスト軸受は、上述の軸受用薄肉軌道部材と、軸受用薄肉軌道部材の転走面上に配置されている転動体とを備えている。   A thrust bearing according to the present invention includes the above-described thin bearing member for bearing and a rolling element disposed on the rolling surface of the thin bearing member for bearing.

本発明のスラスト軸受によれば、長寿命かつ靭性に優れ、同時に低コストなスラスト軸受を提供することができる。   According to the thrust bearing of the present invention, it is possible to provide a thrust bearing having a long life and excellent toughness and at the same time low cost.

以上の説明から明らかなように、長寿命かつ靭性に優れ、同時に低コストな軸受を構成可能な軸受用薄肉軌道部材およびその軸受用薄肉軌道部材を備えたスラスト軸受を提供することができる。   As is clear from the above description, it is possible to provide a thin bearing member for bearings that can form a low-cost bearing that is excellent in long life and toughness, and a thrust bearing provided with the thin race member for bearings.

以下、図面に基づいて本発明の実施の形態を説明する。図１は本発明の一実施の形態であるスラストころ軸受を示す概略断面図である。図１を参照して、本発明の実施の形態のスラストころ軸受の構成を説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view showing a thrust roller bearing according to an embodiment of the present invention. With reference to FIG. 1, the structure of the thrust roller bearing of embodiment of this invention is demonstrated.

図１を参照して、スラストころ軸受１は、たとえば一対の軌道盤（軌道部材）１１、１１と、複数の転動体１２と、環状の保持器１３とを備えている。転動体１２は一対の軌道盤１１、１１の間において、軌道盤１１、１１の転走面１１Ａ、１１Ａに接触して配置されている。さらに、転動体１２は保持器１３により周方向に所定のピッチで配置され、かつ転動自在に保持されている。これにより、軌道盤１１、１１の各々は互いに相対的に回転することができる。   Referring to FIG. 1, the thrust roller bearing 1 includes, for example, a pair of bearing plates (track members) 11, 11, a plurality of rolling elements 12, and an annular cage 13. The rolling element 12 is disposed between the pair of washer disks 11 and 11 in contact with the rolling surfaces 11A and 11A of the washer disks 11 and 11. Further, the rolling elements 12 are arranged at a predetermined pitch in the circumferential direction by the cage 13 and are held so as to be freely rollable. Thereby, each of the washer disks 11 and 11 can rotate relative to each other.

軌道盤１１は後述するように焼入硬化して使用されるものであり、軌道盤１１において転動体１２が接触する表面である転走面１１Ａを構成する部分の厚さは３ｍｍ以下である。また、スラストころ軸受１の軌道盤１１の水素含有量は０．３ｐｐｍ以下であり、かつ転走面１１Ａの転動体１２が接触する部分の表面の硬さは７００ＨＶ以上である。   The washer 11 is used after being hardened by hardening, as will be described later, and the thickness of the portion constituting the rolling surface 11A, which is the surface with which the rolling element 12 contacts, is 3 mm or less. Further, the hydrogen content of the washer 11 of the thrust roller bearing 1 is 0.3 ppm or less, and the hardness of the surface of the rolling surface 11A where the rolling elements 12 contact is 700 HV or more.

ここで軌道盤１１の水素含有量はたとえば軌道盤１１を測定装置内で加熱し、熱伝導度法を用いることにより測定することができる。また、転走面１１Ａの転動体１２が接触する部分の表面の硬さはたとえばビッカース硬度計により、測定することができる。   Here, the hydrogen content of the washer 11 can be measured, for example, by heating the washer 11 in a measuring device and using the thermal conductivity method. Moreover, the hardness of the surface of the part which 11 A of rolling surfaces contact the rolling element 12 can be measured, for example with a Vickers hardness meter.

また、軌道盤１１の材質には０．４質量％以上１．２質量％以下のＣ（炭素）と、０．１５質量％以上０．６質量％以下のＳｉと、０．６質量％以上１．３質量％以下のＭｎと、０．１５質量％以上２質量％以下のＣｒとを含有する鋼の一例として、たとえばＳ７０Ｃ（ＳＡＥ１０７０）を選択することができる。   Further, the material of the washer disk 11 is 0.4 mass% to 1.2 mass% C (carbon), 0.15 mass% to 0.6 mass% Si, and 0.6 mass% or more. As an example of steel containing 1.3 mass% or less of Mn and 0.15 mass% or more and Cr of 2 mass% or less, S70C (SAE1070) can be selected, for example.

次に、スラストころ軸受１の製造方法について図に基づいて説明する。図２は本実施の形態のスラストころ軸受１の製造工程の概略を示した図である。図３は本実施の形態のスラストころ軸受１の製造工程のうち、誘導加熱工程を示す概略断面図である。また、図４は本実施の形態のスラストころ軸受１の製造工程のうち、金型拘束冷却（焼入）工程を示す概略断面図である。図２〜４を参照して、スラストころ軸受１の製造方法について説明する。   Next, the manufacturing method of the thrust roller bearing 1 is demonstrated based on figures. FIG. 2 is a diagram showing an outline of the manufacturing process of the thrust roller bearing 1 of the present embodiment. FIG. 3 is a schematic cross-sectional view showing an induction heating process in the manufacturing process of the thrust roller bearing 1 of the present embodiment. FIG. 4 is a schematic cross-sectional view showing a die restraint cooling (quenching) step in the manufacturing process of the thrust roller bearing 1 of the present embodiment. The manufacturing method of the thrust roller bearing 1 is demonstrated with reference to FIGS.

図２〜４を参照して、たとえば材質がＳ７０Ｃ（ＳＡＥ１０７０）である鋼板をプレス加工により打ち抜き、軌道盤１１を成形する。次に成形された軌道盤１１を誘導加熱装置２にセットし、誘導加熱によりＡｃ１点以上の温度に加熱して所定時間保持する。その後直ちに、たとえば金型拘束冷却装置３（図４参照）によりＭｓ点以下の温度まで急冷して焼入硬化する。その後さらに、たとえば雰囲気炉において１５０℃程度の低温に加熱して焼戻を行う。 2 to 4, for example, a steel plate made of S70C (SAE1070) is punched out by pressing to form the washer disk 11. Next, the molded washer 11 is set in the induction heating device 2, heated to a temperature of the Ac1 point or higher by induction heating, and held for a predetermined time. Immediately thereafter, for example, the mold is cooled by quenching to a temperature below the M s point by the die restraint cooling device 3 (see FIG. 4) and hardened by hardening. Thereafter, tempering is performed by heating to a low temperature of about 150 ° C. in an atmosphere furnace, for example.

次に上述の製造工程のうち、焼入硬化処理工程について図３および図４を参照して詳細に説明する。図３に示した誘導加熱装置２はたとえば回転テーブル２１と、誘導コイル２２を備えている。また、回転テーブル２１は軌道盤１１をセットするための突出部２１Ａを有している。図４に示した金型拘束冷却装置３は下部金型３１Ａと上部金型３１Ｂを備えており、上部金型の上方にはプレス用錘３２を載せることが可能な構成となっている。   Next, among the above manufacturing processes, the quench hardening process will be described in detail with reference to FIGS. The induction heating device 2 shown in FIG. 3 includes, for example, a rotary table 21 and an induction coil 22. The rotary table 21 has a protruding portion 21A for setting the washer disk 11. The die restraint cooling device 3 shown in FIG. 4 includes a lower die 31A and an upper die 31B, and is configured such that a pressing weight 32 can be placed above the upper die.

図３に示すように、成形された軌道盤１１は回転テーブル２１の突出部２１Ａの上方に接触するようにセットされる。次に、誘導コイル２２には高周波電流が通電され、軌道盤１１は誘導加熱される。この際、軌道盤１１は回転テーブル２１により回転される。軌道盤１１は誘導加熱によりＡｃ１点以上の温度に加熱され、所定時間保持される。 As shown in FIG. 3, the molded washer 11 is set so as to be in contact with the upper part of the protruding portion 21 </ b> A of the rotary table 21. Next, the induction coil 22 is energized with a high-frequency current, and the washer 11 is induction-heated. At this time, the washer 11 is rotated by the rotary table 21. The washer 11 is heated to a temperature of the Ac1 point or higher by induction heating and is held for a predetermined time.

その後、直ちに隣接する金型拘束冷却装置３の下部金型３１Ａと上部金型３１Ｂとの間に挟まれ、さらに上部金型３１Ｂにはプレス用錘３２が載せられる。これにより、軌道盤１１は金型３１Ａ、３１Ｂにより拘束されながら、冷却部材としての金型３１Ａ、３１Ｂにより熱を除去されることによりＭｓ点以下の温度まで急冷される。 After that, it is immediately sandwiched between the lower mold 31A and the upper mold 31B of the adjacent mold restraint cooling device 3, and the pressing weight 32 is placed on the upper mold 31B. As a result, the washer 11 is rapidly cooled to a temperature equal to or lower than the M s point by removing heat from the dies 31A and 31B as cooling members while being restrained by the dies 31A and 31B.

ここで、軌道盤１１の転動体１２が接触する表面である転走面１１Ａを構成する部分の厚さは３ｍｍ以下であり、熱容量が小さいため、油および水などの冷却媒体を使用することなく、金型３１Ａ、３１Ｂに接触させることにより十分に急冷することが可能である。   Here, the thickness of the portion constituting the rolling surface 11A, which is the surface with which the rolling elements 12 of the washer 11 come into contact, is 3 mm or less and the heat capacity is small, so that a cooling medium such as oil and water is not used. Sufficient quenching is possible by contacting the molds 31A and 31B.

また、上記の焼入れを行う場合、加熱温度は９００℃〜１０５０℃、加熱時間は０．５秒〜５秒、拘束（プレス）圧力は１１．７ｋＰａ以上、拘束時間は２秒以上とすることが好ましい。また、金型３１Ａ、３１Ｂの材質は金型３１Ａ、３１Ｂの表面の損傷を防止する観点から、焼入硬化された軌道盤１１と同等以上の硬さを有するものであることが好ましく、たとえば焼入硬化された軸受鋼、炭素鋼、ステンレス鋼とすることが好ましい。また、金型３１Ａ、３１Ｂの材質は熱伝導度および耐食性の高いものが好ましい。また、軌道盤１１を拘束するための応力を負荷するために使用される手段は上記プレス用錘３２に限られず、たとえばプレス用錘３２に代えて油圧、空気圧などの上部金型３１Ｂに応力を負荷しうる他の手段を用いてもよい。   Moreover, when performing said hardening, heating temperature shall be 900 to 1050 degreeC, heating time shall be 0.5 second-5 seconds, restraint (press) pressure shall be 11.7 kPa or more, and restraint time shall be 2 seconds or more. preferable. Further, the material of the molds 31A, 31B is preferably one having a hardness equal to or higher than that of the hardened hard disk 11 from the viewpoint of preventing damage to the surfaces of the molds 31A, 31B. It is preferable to use hardened bearing steel, carbon steel, and stainless steel. The materials of the molds 31A and 31B are preferably those having high thermal conductivity and corrosion resistance. The means used to apply the stress for restraining the washer 11 is not limited to the press weight 32. For example, instead of the press weight 32, stress is applied to the upper die 31B such as hydraulic pressure or air pressure. Other means that can be loaded may be used.

さらに、金型３１Ａ、３１Ｂの大きさについては、焼入硬化される軌道盤１１との熱容量差が大きいことが必要であり、金型３１Ａ、３１Ｂのそれぞれの体積は軌道盤１１の体積の５０倍以上であることが好ましい。なお、金型内に水などの冷却媒体を流すことで金型３１Ａ、３１Ｂと焼入硬化される軌道盤１１との必要な体積比を小さくすることが可能であり、これにより金型拘束冷却装置３をコンパクト化することができる。また、金型３１Ａ、３１Ｂに空気などの気体を吹き付けて冷却することで、同様の効果を得ることができる。この場合、気体を吹き付けることで、金型３１Ａ、３１Ｂに付着したごみ等を除去することもできる。   Further, regarding the size of the molds 31A and 31B, it is necessary that the difference in heat capacity with the hard disk hardened washer 11 is large, and the respective volumes of the molds 31A and 31B are 50 times the volume of the washer disk 11. It is preferable that it is twice or more. It is possible to reduce the required volume ratio between the molds 31A and 31B and the hard disk hard disk 11 by flowing a cooling medium such as water into the mold, thereby restricting cooling of the mold. The apparatus 3 can be made compact. Moreover, the same effect can be acquired by spraying gas, such as air, on metal mold | die 31A, 31B and cooling. In this case, the dust etc. which adhered to metal mold | die 31A, 31B can also be removed by spraying gas.

また、金型３１Ａ、３１Ｂの精度は焼入硬化される軌道盤１１の精度に影響するため高いことが好ましい。すなわち反りおよびうねりが小さく、かつ表面粗さが小さい（研磨仕上げレベル）ことが好ましい。   Moreover, since the precision of metal mold | die 31A, 31B influences the precision of the washer disk 11 hardened and hardened, it is preferable that it is high. That is, it is preferable that warpage and undulation are small and the surface roughness is small (polishing finish level).

また、焼入硬化処理における誘導加熱工程および金型拘束冷却工程は空気雰囲気中で行うことができるが、好ましくは酸化を抑制する雰囲気中、たとえば窒素などの反応性に乏しい気体雰囲気中で行う。   In addition, the induction heating step and the die constrained cooling step in the quench hardening process can be performed in an air atmosphere, but are preferably performed in an atmosphere that suppresses oxidation, for example, in a gas atmosphere having poor reactivity such as nitrogen.

以下、本発明の実施例について説明する。本発明の軸受用薄肉軌道部材（軌道盤）およびスラスト軸受（スラストころ軸受）を作製し、従来の軸受用薄肉軌道部材およびスラスト軸受と比較する実験を行った。   Examples of the present invention will be described below. Thin bearing members (bearing discs) and thrust bearings (thrust roller bearings) for bearings according to the present invention were produced, and experiments were conducted in comparison with conventional thin bearing members for bearings and thrust bearings.

以下、実験の手順を説明する。まず、本発明の実施例の素材としてはＳＡＥ１０７０（実施例Ａ）、ＳＡＥ１０７０の成分をベースとして炭素量を変えたもの（実施例Ｂおよび実施例Ｃ）、ＳＫ５（実施例Ｄ）およびＳＵＪ２（実施例Ｅ）を選択した。一方、比較例の素材としてはＳＡＥ１０７０（比較例ＡおよびＤ）、ＳＣＭ４１５（比較例Ｂ）およびＳＵＪ２（比較例Ｃ）を選択した。上記素材の鋼板を打ち抜き、外径８０ｍｍ、内径６５ｍｍ、厚さ１ｍｍの軌道盤を成形した。   The experimental procedure will be described below. First, as materials of the examples of the present invention, SAE1070 (Example A), materials having different amounts of carbon based on the components of SAE1070 (Example B and Example C), SK5 (Example D), and SUJ2 (Example) Example E) was selected. On the other hand, SAE1070 (Comparative Examples A and D), SCM415 (Comparative Example B) and SUJ2 (Comparative Example C) were selected as materials for the comparative examples. A steel plate made of the above material was punched out to form a washer having an outer diameter of 80 mm, an inner diameter of 65 mm, and a thickness of 1 mm.

次に、成形された実施例Ａ〜Ｅの軌道盤を実施の形態において図３および図４に基づいて説明した方法で焼入硬化した。加熱温度は９５０℃、加熱時間は１．５秒、拘束（プレス）圧力は１５ｋＰａ、拘束（プレス）時間は４秒とした。なお、焼入硬化後の実施例Ａ〜Ｅの軌道盤の反り量はいずれも３０μｍ以下となっていた。その後、焼入硬化された軌道盤に対して雰囲気炉において加熱温度１５０℃、加熱時間３０分の条件で焼戻を実施した。   Next, the formed washer of Examples A to E was hardened by the method described with reference to FIGS. 3 and 4 in the embodiment. The heating temperature was 950 ° C., the heating time was 1.5 seconds, the restraint (press) pressure was 15 kPa, and the restraint (press) time was 4 seconds. In addition, the curvature amount of the washer of Examples A to E after quench hardening was 30 μm or less. Thereafter, tempering was performed on the hardened hard disk in the atmosphere furnace under the conditions of a heating temperature of 150 ° C. and a heating time of 30 minutes.

一方、比較例Ａ、Ｃ、Ｄについてはガス雰囲気加熱炉（ＲＸガスおよびエンリッチガス雰囲気）において加熱温度８５０℃、加熱時間３０分の条件で加熱した後、衝風冷却することにより焼入硬化した。比較例Ｂについてはガス雰囲気浸炭炉（ＲＸガスおよびエンリッチガス雰囲気）において浸炭し、衝風冷却することにより焼入硬化した。焼入硬化後、比較例Ａ〜Ｄの軌道盤は１００μｍ以上の反りを有するものが多数あったことから、２３０℃に加熱してプレスすることにより矯正した。ただし、比較例Ｄについては加熱温度は１５０℃とした。   On the other hand, Comparative Examples A, C, and D were quenched and hardened by blast cooling after heating in a gas atmosphere heating furnace (RX gas and enriched gas atmosphere) at a heating temperature of 850 ° C. and a heating time of 30 minutes. . For Comparative Example B, carburization was performed in a gas atmosphere carburizing furnace (RX gas and enriched gas atmosphere), and quench hardening was performed by blast cooling. After quench hardening, many of the bearing discs of Comparative Examples A to D had a warp of 100 μm or more, and were corrected by heating to 230 ° C. and pressing. However, for Comparative Example D, the heating temperature was 150 ° C.

上記実施例および比較例について、軌道盤の表面の硬さおよび軌道盤の水素含有量を測定した。軌道盤の表面の硬さは転走面の、転動体が接触する部分の表面をビッカース硬度計により測定した。また、水素含有量は表１に示す条件で測定した。なお表１の条件では主に非拡散性水素が測定されている。   About the said Example and comparative example, the hardness of the surface of a washer and the hydrogen content of a washer were measured. The surface hardness of the washer was measured with a Vickers hardness tester on the surface of the rolling surface where the rolling elements contact. The hydrogen content was measured under the conditions shown in Table 1. Note that non-diffusible hydrogen is mainly measured under the conditions shown in Table 1.

Figure 0004642490
Figure 0004642490

次に、上記軌道盤を用いて、直径φ３ｍｍ、長さ７．８ｍｍのころを２４本備えたスラストころ軸受を作製し、寿命を調査した。寿命試験は、回転数５０００ｒｐｍ、軸受荷重９．８ｋＮ、潤滑油ＶＧ２、油膜パラメータ０．１０１、計算寿命１１．３時間の条件の下で行った。また、試験個数は各実施例および比較例についてそれぞれ６個とした。試験に供した各６個の軸受の寿命の平均値を算出し、さらに比較例Ａの寿命に対する比を算出することで寿命を評価した。   Next, a thrust roller bearing provided with 24 rollers having a diameter of 3 mm and a length of 7.8 mm was manufactured using the above washer, and the life was investigated. The life test was performed under the conditions of a rotational speed of 5000 rpm, a bearing load of 9.8 kN, a lubricating oil VG2, an oil film parameter of 0.101, and a calculated life of 11.3 hours. The number of tests was 6 for each example and comparative example. The average value of the life of each of the six bearings subjected to the test was calculated, and the life was evaluated by calculating the ratio to the life of Comparative Example A.

次に、上記軌道盤から縦８ｍｍ、横２５ｍｍ、厚さ１ｍｍの平板の試験片を切り出し、３点曲げ試験を行った。図５は本実施例の３点曲げ試験の試験方法を示した図である。３点曲げ試験装置５は中央部に凹部を有する支持台５１と、支点用ころ５２、５２と、負荷用ころ５３と、負荷用部材５４とを備えている。ころ５２、５３は直径３ｍｍのころである。   Next, a flat test piece having a length of 8 mm, a width of 25 mm, and a thickness of 1 mm was cut out from the raceway, and a three-point bending test was performed. FIG. 5 is a diagram showing a test method of the three-point bending test of this example. The three-point bending test apparatus 5 includes a support base 51 having a recess in the center, fulcrum rollers 52 and 52, load rollers 53, and load members 54. The rollers 52 and 53 are rollers having a diameter of 3 mm.

水平面上に設置された支持台５１の上方には支点用ころ５２が支持台５１に接触して配置される。支点用ころ５２の上方には試験片４０が支点用ころ５２に接触して配置される。このとき支点間の距離は２０ｍｍである。試験片４０の上方であって、２つの支点用ころからの距離が等しくなる位置には負荷用ころ５３が試験片４０に接触して配置される。さらに、負荷用ころ５３の上方には負荷用部材５４が負荷用ころ５３に接触して配置される。   A fulcrum roller 52 is disposed in contact with the support base 51 above the support base 51 installed on a horizontal plane. Above the fulcrum roller 52, the test piece 40 is disposed in contact with the fulcrum roller 52. At this time, the distance between the fulcrums is 20 mm. A load roller 53 is disposed in contact with the test piece 40 at a position above the test piece 40 and at the same distance from the two fulcrum rollers. Further, a load member 54 is disposed above the load roller 53 in contact with the load roller 53.

負荷用部材５４には鉛直下向きの荷重が負荷され、試験片４０に割れが発生するまでの荷重が測定された。測定された荷重は比較例Ａに対する比で評価した。   The load 54 was loaded with a vertically downward load, and the load until the test piece 40 was cracked was measured. The measured load was evaluated by the ratio with respect to Comparative Example A.

表２は上記実験の結果を示した表である。表２を参照して、実験結果について説明する。   Table 2 shows the results of the above experiment. The experimental results will be described with reference to Table 2.

Figure 0004642490
Figure 0004642490

表２を参照して、実施例Ａ〜Ｅの軌道盤の表面の硬さはいずれも７１５ＨＶ以上となっており、軸受の寿命を確保するために必要な硬さである７００ＨＶ以上となっている。また、軌道盤の水素含有量はいずれも０．２２ｐｐｍ以下となっており、軸受の寿命および靭性が著しく向上する０．３ｐｐｍ以下となっている。   With reference to Table 2, the hardness of the surface of the washer of Examples A to E is 715 HV or higher, and is 700 HV or higher, which is the hardness necessary to ensure the life of the bearing. . In addition, the hydrogen content of the washer is 0.22 ppm or less, and is 0.3 ppm or less, which significantly improves the life and toughness of the bearing.

一方、比較例Ａ〜Ｄのうち比較例Ｂの軌道盤は表面の硬さが７００ＨＶ以下となっている。また、比較例ＡおよびＣの軌道盤の表面の硬さは７００ＨＶ以上となっているものの、それぞれ同じ材質である実施例ＡおよびＥと比較して低くなっている。これは、比較例Ａ〜Ｃは実施例ＡおよびＥの焼戻温度である１５０℃より高い２３０℃で加熱矯正されているためである。   On the other hand, the surface disc of Comparative Example B among Comparative Examples A to D has a surface hardness of 700 HV or less. Moreover, although the hardness of the surface of the washer of Comparative Examples A and C is 700 HV or higher, it is lower than Examples A and E, which are the same material. This is because Comparative Examples A to C are heated and corrected at 230 ° C., which is higher than 150 ° C., which is the tempering temperature of Examples A and E.

表２を参照して、実施例Ａ〜Ｅの寿命は比較例Ａの２．４〜４．２倍と非常に長寿命となっている。このことから、水素含有量が０．３ｐｐｍ以下となっている実施例Ａ〜Ｅはいずれも長寿命となることが確認される。一方、比較例Ｃは実施例ＢおよびＣと同等の寿命を有している。しかし、比較例Ｃが高価な軸受鋼であるのに対し、実施例ＢおよびＣは安価な炭素鋼であることを考慮すれば、コスト面から実施例ＢおよびＣのほうが有利である。すなわち、軌道盤の水素含有量を０．３ｐｐｍ以下とすることで、安価な炭素鋼の軌道盤に高価な軸受鋼の軌道盤と同等の寿命を付与することができる。   Referring to Table 2, the life of Examples A to E is 2.4 to 4.2 times that of Comparative Example A, which is a very long life. From this, it is confirmed that all of Examples A to E having a hydrogen content of 0.3 ppm or less have a long life. On the other hand, Comparative Example C has the same life as Examples B and C. However, considering that Comparative Example C is an expensive bearing steel while Examples B and C are inexpensive carbon steels, Examples B and C are more advantageous in terms of cost. That is, by setting the hydrogen content of the washer to 0.3 ppm or less, a life equivalent to that of an expensive bearing steel washer can be imparted to an inexpensive carbon steel washer.

さらに表２を参照して、実施例および比較例において同一素材である実施例Ａと比較例Ａ、実施例Ｅと比較例Ｃとを比較すると、実施例は比較例に対して２３〜３０％曲げ強度が高くなっている。これは硬さの影響であるとも考えられる。しかし、比較例Ａと比較例Ｄとを比較すると、比較例Ｄは比較例Ａと同一の素材であり、かつ硬さは比較例Ａよりも高いにもかかわらず、曲げ強度はむしろ低くなっている。一方で、比較例Ｄは比較例Ａに比べて水素含有量が多いことを考慮すれば、曲げ強度は水素含有量の影響を大きく受けていると考えられる。以上より、実施例Ａ〜Ｄは水素含有量が０．３ｐｐｍ以下であるため、高い曲げ強度を有していると考えられる。   Further, referring to Table 2, when Example A and Comparative Example A, and Example E and Comparative Example C, which are the same material in Examples and Comparative Examples, are compared, the Examples are 23 to 30% of the Comparative Examples. The bending strength is high. This is also considered to be an effect of hardness. However, when Comparative Example A and Comparative Example D are compared, Comparative Example D is the same material as Comparative Example A, and the bending strength is rather low although the hardness is higher than Comparative Example A. Yes. On the other hand, considering that Comparative Example D has a higher hydrogen content than Comparative Example A, it is considered that the bending strength is greatly affected by the hydrogen content. From the above, Examples A to D are considered to have high bending strength because the hydrogen content is 0.3 ppm or less.

今回開示された実施の形態および実施例はすべての点で例示であって、制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味、および範囲内でのすべての変更が含まれることが意図される。   The embodiments and examples disclosed herein are illustrative in all respects and should not be construed as being restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

本発明の軸受用薄肉軌道部材およびスラスト軸受は、焼入硬化して使用され、軸受の転動体が接触する表面である転走面を構成する部分の厚さが３ｍｍ以下である軸受用薄肉軌道部材、およびこれを備えたスラスト軸受に特に有利に適用される。   The thin-walled bearing member and thrust bearing for bearings of the present invention are used after being hardened and hardened, and the thickness of the portion constituting the rolling surface, which is the surface that contacts the rolling elements of the bearing, is 3 mm or less. The present invention is particularly advantageously applied to a member and a thrust bearing provided with the member.

本発明の一実施の形態であるスラストころ軸受を示す概略断面図である。It is a schematic sectional drawing which shows the thrust roller bearing which is one embodiment of this invention. 本実施の形態のスラストころ軸受１の製造工程の概略を示した図である。It is the figure which showed the outline of the manufacturing process of the thrust roller bearing 1 of this Embodiment. 本実施の形態のスラストころ軸受１の製造工程のうち、誘導加熱工程を示す概略断面図である。It is a schematic sectional drawing which shows an induction heating process among the manufacturing processes of the thrust roller bearing 1 of this Embodiment. 本実施の形態のスラストころ軸受１の製造工程のうち、金型拘束冷却（焼入）工程を示す概略断面図である。It is a schematic sectional drawing which shows a metal mold | die restraint cooling (quenching) process among the manufacturing processes of the thrust roller bearing 1 of this Embodiment. 本実施例の３点曲げ試験の試験方法を示した図である。It is the figure which showed the test method of the three-point bending test of a present Example.

符号の説明Explanation of symbols

１ スラストころ軸受、２ 誘導加熱装置、３ 金型拘束冷却装置、５ ３点曲げ試験装置、１１ 軌道盤、１１Ａ 転走面、１２ 転動体、１３ 保持器、２１ 回転テーブル、２１Ａ 突出部、２２ 誘導コイル、３１Ａ 下部金型、３１Ｂ 上部金型、３２ プレス用錘、４０ 試験片、５１ 支持台、５２ 支点用ころ、５３ 負荷用ころ、５４ 負荷用部材。   DESCRIPTION OF SYMBOLS 1 Thrust roller bearing, 2 Induction heating device, 3 Mold constrained cooling device, 5 3-point bending test device, 11 Raceway, 11A Rolling surface, 12 Rolling body, 13 Cage, 21 Rotary table, 21A Protruding part, 22 Induction coil, 31A lower mold, 31B upper mold, 32 press weight, 40 test piece, 51 support base, 52 fulcrum roller, 53 load roller, 54 load member.

Claims (6)

鋼を加工することにより軸受用薄肉軌道部材を成形する工程と、
前記軸受用薄肉軌道部材を焼入硬化する工程とを備え、
前記軸受用薄肉軌道部材を焼入硬化する工程は、
前記軸受用薄肉軌道部材をＡｃ１点以上の温度に加熱する工程と、
Ａｃ１点以上の温度に加熱された前記軸受用薄肉軌道部材をＭｓ点以下の温度まで急冷する工程とを含み、
前記軸受用薄肉軌道部材を急冷する工程では、前記軸受用薄肉軌道部材は金型を用いて拘束されながら冷却されており、前記金型は前記軸受用薄肉軌道部材から熱を除去するための冷却部材として用いられる、軸受用薄肉軌道部材の製造方法。 Forming thin bearing members for bearings by processing steel; and
And quenching and hardening the thin bearing member for bearing,
The step of quench-hardening the thin bearing member for bearing is as follows.
Heating the thin bearing member for bearing to a temperature equal to or higher than Ac1 point;
A step of rapidly cooling the thin-walled bearing member for bearings heated to a temperature of A c1 point or higher to a temperature of M s point or lower,
In the step of rapidly cooling the thin bearing member for bearing, the thin bearing member for bearing is cooled while being restrained by using a mold, and the die is cooled for removing heat from the thin member for bearing. A method for manufacturing a thin-walled bearing member for a bearing used as a member. 前記軸受用薄肉軌道部材の転走面を構成する部分の厚さは３ｍｍ以下である、請求項１に記載の軸受用薄肉軌道部材の製造方法。   The method of manufacturing a thin-walled bearing member for a bearing according to claim 1, wherein a thickness of a portion constituting a rolling surface of the thin-walled bearing member for a bearing is 3 mm or less. 前記軸受用薄肉軌道部材を急冷する工程では、油および水を冷却媒体として使用することなく前記軸受用薄肉軌道部材が急冷される、請求項１または２に記載の軸受用薄肉軌道部材の製造方法。   The method for manufacturing a thin-walled bearing member for a bearing according to claim 1 or 2, wherein in the step of rapidly cooling the thin-walled bearing member for bearing, the thin-walled bearing member for bearing is rapidly cooled without using oil and water as a cooling medium. . 前記金型の体積は、前記軸受用薄肉軌道部材の体積の５０倍以上である、請求項１〜３のいずれか１項に記載の軸受用薄肉軌道部材の製造方法。   The volume of the said metal mold | die is a manufacturing method of the thin track member for bearings of any one of Claims 1-3 which is 50 times or more of the volume of the thin track member for bearings. 前記鋼はＳＡＥ１０７０またはＪＩＳ規格ＳＫ５である、請求項１〜４のいずれか１項に記載の軸受用薄肉軌道部材の製造方法。   The said steel is SAE1070 or JIS specification SK5, The manufacturing method of the thin-walled track member for bearings of any one of Claims 1-4. 前記軸受用薄肉軌道部材を焼入硬化する工程では、誘導加熱により前記軸受用薄肉軌道部材が加熱される、請求項１〜５のいずれか１項に記載の軸受用薄肉軌道部材の製造方法。   The method for manufacturing a thin-walled bearing member for a bearing according to any one of claims 1 to 5, wherein the thin-walled bearing member for a bearing is heated by induction heating in the step of quenching and hardening the thin-walled bearing member for a bearing.
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JPH10204612A (en) * 1997-01-22 1998-08-04 Nippon Seiko Kk Dehydrogenation for machine parts
JP2001234277A (en) * 2000-02-23 2001-08-28 Nippon Steel Corp High strength steel excellent in fatigue characteristic and producing method therefor
WO2002040730A1 (en) * 2000-11-15 2002-05-23 Nsk Ltd. Part for machine
JP2004092913A (en) * 2001-11-29 2004-03-25 Ntn Corp Rolling bearing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10204612A (en) * 1997-01-22 1998-08-04 Nippon Seiko Kk Dehydrogenation for machine parts
JP2001234277A (en) * 2000-02-23 2001-08-28 Nippon Steel Corp High strength steel excellent in fatigue characteristic and producing method therefor
WO2002040730A1 (en) * 2000-11-15 2002-05-23 Nsk Ltd. Part for machine
JP2004092913A (en) * 2001-11-29 2004-03-25 Ntn Corp Rolling bearing

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