JPH09137854A - Finish machining method for traction drive rolling body surface - Google Patents
Finish machining method for traction drive rolling body surfaceInfo
- Publication number
- JPH09137854A JPH09137854A JP29693295A JP29693295A JPH09137854A JP H09137854 A JPH09137854 A JP H09137854A JP 29693295 A JP29693295 A JP 29693295A JP 29693295 A JP29693295 A JP 29693295A JP H09137854 A JPH09137854 A JP H09137854A
- Authority
- JP
- Japan
- Prior art keywords
- rolling
- traction drive
- burnishing
- processing
- traction
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えばトラクションド
ライブ方式の無段変速装置におけるパワーローラ，入力
ディスク，出力ディスクなど、トラクションドライブ転
動体の転動面を仕上加工するのに利用されるトラクショ
ンドライブ転動体表面の仕上加工方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traction drive used for finishing a rolling surface of a traction drive rolling element such as a power roller, an input disc and an output disc in a traction drive type continuously variable transmission. The present invention relates to a method of finishing a rolling element surface.
【０００２】[0002]
【従来の技術】トラクションドライブは、専用に開発さ
れたトラクションオイル中において金属面間に形成され
る油膜のせん断力を利用して動力伝達する方式であっ
て、上記した無段変速装置においては、パワーローラの
回転軸芯を傾動させることによって入力ディスクおよび
出力ディスクとの接触点の回転半径を連続的に変化さ
せ、これにより入力ディスクの回転速度を無段階に変え
て出力ディスクに伝達するようにしている。2. Description of the Related Art A traction drive is a system for transmitting power by utilizing the shearing force of an oil film formed between metal surfaces in a traction oil that has been specially developed, and in the above continuously variable transmission, By tilting the rotation axis of the power roller, the radius of gyration of the contact point with the input disk and the output disk is continuously changed, whereby the rotation speed of the input disk is continuously changed and transmitted to the output disk. ing.
【０００３】このようなトラクションドライブ式無段変
速装置の転動体、すなわちパワーローラ，入力ディス
ク，出力ディスクは、耐摩耗性の観点からロックウェル
Ｃ硬さで６０以上の硬度を有し、その転動面には、所定
のトラクション性能を得るための面精度と表面粗さ（細
かさ）が要求されることから、例えば、日本精工の発表
（日経産業新聞 １９９１年１２月２６日）では、転動
体表面の凹凸の高低差を０．０５μｍ以下に仕上げるよ
うにしていた。The rolling elements of such a traction drive type continuously variable transmission, that is, the power roller, the input disk, and the output disk have a Rockwell C hardness of 60 or more from the viewpoint of wear resistance, and the rolling thereof. Since the moving surface is required to have surface precision and surface roughness (fineness) to obtain a predetermined traction performance, for example, in the announcement by NSK Ltd. (Nikkei Sangyo Shimbun December 26, 1991), The height difference of the irregularities on the surface of the moving body is finished to be 0.05 μm or less.
【０００４】[0004]
【発明が解決しようとする課題】しかし、従来のトラク
ションドライブ転動体表面の仕上加工方法においては、
上記したように、転動面の表面の凹凸の高低差を０．０
５μｍ以下とするために、研削加工および超仕上加工を
用いる必要があり、加工装置が高価で設備費の増大が避
けられず、しかも加工能率が低いために、加工コストが
かさむという問題点があった。 また、このようなトラ
クションドライブ転動体には、使用しているうちに転動
面の表面が表面下０．１〜０．２ｍｍのところから剥離
するという疲労強度上の問題点があり、これらの問題点
を解決することが従来のトラクションドライブ転動体の
品質上およびコスト上の課題となっていた。However, in the conventional method of finishing the surface of the traction drive rolling element,
As described above, the height difference of the irregularities on the rolling surface is 0.0
Grinding and superfinishing must be used in order to reduce the thickness to 5 μm or less, and the processing equipment is expensive and the increase in equipment cost is unavoidable. Further, the processing efficiency is low, and the processing cost is high. It was Further, such a traction drive rolling element has a problem in fatigue strength that the surface of the rolling surface peels off from 0.1 to 0.2 mm below the surface during use. Solving the problems has been a problem in terms of quality and cost of conventional traction drive rolling elements.
【０００５】[0005]
【発明の目的】本発明は、従来のトラクションドライブ
転動体における上記課題に着目してなされたものであっ
て、トラクション性能および転動疲労性能に優れた転動
面を備えたトラクションドライブ転動体を高能率，低コ
ストのもとに加工することができるトラクションドライ
ブ転動体表面の仕上加工方法を提供することを目的とし
ている。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems in a conventional traction drive rolling element, and provides a traction drive rolling element having a rolling surface excellent in traction performance and rolling fatigue performance. It is an object of the present invention to provide a finishing method for the surface of a traction drive rolling element that can be processed with high efficiency and low cost.
【０００６】[0006]
【課題を解決するための手段】本発明者は、上記目的を
達成するため、種々の加工法によって得られる表面粗さ
の相違や、このときのトラクション性能，転動疲労性能
への影響などについて、下地加工方法や下地加工後にお
ける下地面の硬さや表面粗さなどをも含めて鋭意検討し
た結果、トラクションドライブ転動体表面の仕上加工に
際して、転動面にバニシング加工を施し、転動表面を塑
性変形させるようになすことによって、転動面の表面粗
さＲａが０．０５μｍを超える粗い場合にも、超仕上加
工によって表面粗さＲａを０．０５μｍ以下に仕上げた
場合と同等、あるいはそれ以上のトラクション性能を発
揮することを見出すと共に、当該バニシング加工によっ
て転動表面下に残留応力が発生し、これによって転動疲
労性能が向上することを確認するに至った。In order to achieve the above-mentioned object, the present inventor has studied the difference in surface roughness obtained by various processing methods and the influence on traction performance and rolling contact fatigue performance at this time. As a result of diligent examination including the surface processing method and the hardness and surface roughness of the surface after the surface processing, as a result of finishing the traction drive rolling element surface, the rolling surface was burnished and the rolling surface was finished. By performing plastic deformation, even when the surface roughness Ra of the rolling surface exceeds 0.05 μm, it is equivalent to or when the surface roughness Ra is finished to less than 0.05 μm by superfinishing. In addition to finding that the above traction performance is exhibited, the burnishing process causes residual stress under the rolling surface, which improves rolling fatigue performance. And came to confirm.
【０００７】本発明に係わるトラクションドライブ転動
体表面の仕上加工方法は、上記知見に基づくものであっ
て、本発明の請求項１に係わる加工方法は、トラクショ
ンドライブ転動体の転動面にバニシング加工を施し、当
該転動面の中心線平均粗さＲａを０．２μｍ以下に仕上
げる構成としたことを特徴としており、このようなトラ
クションドライブ転動体表面の仕上加工方法の構成を前
述した従来の課題を解決するための手段としている。The finishing method of the surface of the traction drive rolling element according to the present invention is based on the above-mentioned findings, and the processing method according to claim 1 of the present invention is the burnishing processing on the rolling surface of the traction drive rolling element. And the center line average roughness Ra of the rolling surface is finished to 0.2 μm or less. The above-mentioned conventional problems concerning the construction of the finishing processing method for the surface of the traction drive rolling element are described above. As a means to solve
【０００８】本発明に係わるトラクションドライブ転動
体表面の仕上加工方法の実施態様として請求項２に係わ
る加工方法は、バニシング加工の面圧が７．０ＧＰａ以
上である構成とし、同じく実施態様として請求項３に係
わる加工方法は、バニシング加工の下地加工が旋削加工
である構成、さらに実施態様として請求項４に係わる加
工方法は、下地加工後の転動面の中心線平均粗さＲａが
０．５μｍ以下である構成としており、このようなトラ
クションドライブ転動体表面の仕上加工方法の構成を前
述した従来の課題を解決するための手段としたことを特
徴としている。According to an embodiment of the method for finishing the surface of a traction drive rolling element according to the present invention, the processing method according to claim 2 is such that the surface pressure of the burnishing is 7.0 GPa or more. The processing method according to No. 3 is configured such that the ground processing of the burnishing processing is a turning processing, and the processing method according to claim 4 as an embodiment is that the center line average roughness Ra of the rolling surface after the ground processing is 0.5 μm. It has the following configuration, and is characterized in that the configuration of such a finishing processing method for the surface of the traction drive rolling element is used as means for solving the above-mentioned conventional problems.
【０００９】本発明に係わるトラクションドライブ転動
体表面の仕上加工方法において適用されるバニシング加
工は、工作物の表面に高硬度の工具を押し付けることに
よって工作物の表面に塑性変形を与えるものであって、
表面を平滑にすると共に寸法精度を向上させることがで
きる。 そして、このバニシング加工に基づく塑性変形
によって、工作物の被加工面、とくに表面下０．１〜
０．２ｍｍの部位に圧縮残留応力が発生し、この圧縮残
留応力が転動体の剥離寿命を延長させ、転動疲労性能の
向上に寄与しているものと考えられる。The burnishing applied in the method for finishing the surface of the traction drive rolling element according to the present invention is to apply a plastic deformation to the surface of the work by pressing a high hardness tool against the surface of the work. ,
The surface can be made smooth and the dimensional accuracy can be improved. Then, due to the plastic deformation based on the burnishing process, the work surface of the workpiece, particularly 0.1 to 100 below the surface.
It is considered that a compressive residual stress is generated at a portion of 0.2 mm, and this compressive residual stress extends the peeling life of the rolling element and contributes to the improvement of rolling contact fatigue performance.
【００１０】本発明に係わる仕上加工方法において、バ
ニシング加工に際して転動体の転動面に加えられる面圧
としては、転動面にバニシング加工本来の塑性変形を付
与するに足り、転動面近傍に圧縮残留応力が発生する限
り、とくに限定されないが、十分な圧縮残留応力を発生
させ転動疲労性能を有効に改善するには７．０ＧＰａ以
上の面圧を加えることが望ましい。 また、バニシング
加工による表面粗さの向上代は、面圧が高いほど大き
く、７．０ＧＰａ未満では表面粗さの向上代が低いた
め、下地面の表面粗さをより小さくする必要があり、そ
れによって下地加工の工数の増大を招いてしまう。In the finishing method according to the present invention, the surface pressure applied to the rolling surface of the rolling element at the time of burnishing is sufficient to give the rolling surface a plastic deformation inherent to the burnishing process, and the pressure in the vicinity of the rolling surface is sufficient. There is no particular limitation as long as the compressive residual stress is generated, but it is desirable to apply a surface pressure of 7.0 GPa or more in order to generate sufficient compressive residual stress and effectively improve the rolling fatigue performance. Further, the surface roughness improvement margin by the burnishing process is larger as the surface pressure is higher, and the surface roughness improvement margin is low when the surface pressure is less than 7.0 GPa. Therefore, it is necessary to further reduce the surface roughness of the base surface. This causes an increase in the number of man-hours for groundwork processing.
【００１１】バニシング加工によって得られる被加工面
の表面粗さＲａは、バニシング加工条件（面圧，周速，
送り）と、加工前の下地面の硬さおよび表面粗さＲａに
よって決定されるが、このうち周速および送りの影響は
さほど大きくはない。 すなわち、バニシング加工によ
る表面粗さＲａは、下地面の硬さが低いほど、下地面の
表面粗さが細かいほど、バニシング加工の面圧が高いほ
ど小さく（細かく）、平滑になる。The surface roughness Ra of the surface to be processed obtained by the burnishing process depends on the burnishing conditions (surface pressure, peripheral speed,
Feeding) and the hardness and surface roughness Ra of the lower ground before processing, of which the influence of the peripheral speed and feeding is not so large. That is, the surface roughness Ra by the burnishing process becomes smaller (finer) and smoother as the hardness of the base surface is lower, the surface roughness of the base surface is finer, and the surface pressure of the burnishing process is higher.
【００１２】本発明に係わる仕上加工方法においては、
バニシング加工による転動面の表面粗さＲａを０．２μ
ｍ以下に仕上げるようにしているが、これはバニシング
加工品においても、やはり表面粗さが大きくなるほど、
金属接触しやすくなり、表面での摩擦熱が増大し、寿命
が低下することによる。 なお、バニシング加工を施す
ことによって、超仕上加工による従来のものより表面粗
さＲａが粗いにもかかわらずトラクション性能が向上す
るメカニズムについては、いまだ不明な部分が多く、目
下解明中である。In the finishing method according to the present invention,
Surface roughness Ra of rolling surface by burnishing is 0.2μ
Although it is finished to m or less, this is also true for burnishing products, as the surface roughness increases,
This is due to the fact that it becomes easier to make metal contact, the frictional heat on the surface increases, and the life decreases. The mechanism by which the traction performance is improved by performing the burnishing process even though the surface roughness Ra is rougher than that of the conventional one by the superfinishing process is still unclear because many parts are still unknown.
【００１３】本発明における転動体の下地加工として
は、旋削（ターニング）加工を採用することができる。
例えば、ＮＣ旋盤にＮＣ化サーキュラテーブルを設
け、当該サーキュラテーブルに旋削工具とバニシング工
具とを搭載することにより、下地加工とバニシング加工
を連続して行うことができるようになり、工程の大幅な
集約が可能になる。Turning processing may be employed as the ground processing for the rolling elements in the present invention.
For example, by providing an NC-type circular table on an NC lathe and mounting a turning tool and a burnishing tool on the circular table, it becomes possible to continuously perform the base processing and the burnishing processing. Will be possible.
【００１４】この旋削加工による下地加工に際して、旋
削加工後の下地面の表面粗さＲａについては０．５μｍ
以下にすることが望ましい。 すなわち、バニシング加
工による転動面の表面粗さＲａは、前述のようにバニシ
ング加工条件と、加工前の下地面の硬さおよび表面粗さ
Ｒａによって影響されるが、耐摩耗性の観点から下地面
の硬さを低くするには限度があるので、下地面の表面粗
さＲａが０．５μｍを超えた場合に、バニシング加工後
の表面粗さＲａを０．２μｍにするためには、バニシン
グ加工の面圧を極めて大きくすることが必要となり、工
具および装置の負担が大幅に増大することによる。At the time of the base processing by the turning process, the surface roughness Ra of the lower ground after the turning process is 0.5 μm.
It is desirable to make the following. That is, the surface roughness Ra of the rolling surface by the burnishing is influenced by the burnishing conditions and the hardness and the surface roughness Ra of the ground surface before processing as described above. Since there is a limit to lowering the hardness of the ground surface, when the surface roughness Ra of the base surface exceeds 0.5 μm, in order to reduce the surface roughness Ra after the burnishing process to 0.2 μm, the burnishing is performed. This is because it is necessary to extremely increase the surface pressure for processing, which significantly increases the load on the tool and the device.
【００１５】[0015]
【発明の作用】本発明の請求項１に係わるトラクション
ドライブ転動体表面の仕上加工方法においては、トラク
ションドライブ転動体の転動面にバニシング加工を施す
ことによって、当該転動面の表面粗さＲａを０．２μｍ
以下に仕上げるようにしているので、超仕上加工を施す
ことなくトラクション性能が向上すると共に、転動面直
下位置に圧縮残留応力が生じて剥離寿命が改善されるこ
ととなり、高価な設備が不要となって、加工コストが低
減される。In the finishing method of the surface of the traction drive rolling element according to the first aspect of the present invention, the surface roughness Ra of the rolling surface is obtained by subjecting the rolling surface of the traction drive rolling element to burnishing. 0.2 μm
Since it is finished as follows, traction performance is improved without superfinishing, and compressive residual stress occurs at the position immediately below the rolling surface to improve peeling life, making expensive equipment unnecessary. Therefore, the processing cost is reduced.
【００１６】本発明に係わるトラクションドライブ転動
体表面の仕上加工方法の実施態様として請求項２に係わ
る加工方法においては、７．０ＧＰａ以上の面圧でバニ
シング加工を施すようにしているので、転動面の塑性変
形および圧縮残留応力が有効に発生し、転動体の剥離寿
命、すなわち転動疲労性能が大幅に向上する。 同じく
実施態様として請求項３に係わる加工方法においては、
バニシング加工の下地加工を旋削加工によって行うよう
にしているので、下地加工とバニシング加工とを連続的
に行うことによって、加工工程が大幅に集約されること
になる。 さらに実施態様として請求項４に係わる加工
方法においては、旋削による下地加工後の転動面の表面
粗さＲａを０．５μｍ以下にしているので、その後のバ
ニシング加工によって転動面が表面粗さＲａ０．２μｍ
以下に無理なく仕上げられる。As an embodiment of the method for finishing the surface of the traction drive rolling element according to the present invention, in the processing method according to claim 2, since the burnishing processing is performed with a surface pressure of 7.0 GPa or more, rolling is performed. The plastic deformation of the surface and the compressive residual stress are effectively generated, and the peeling life of the rolling element, that is, the rolling fatigue performance is significantly improved. Similarly, in the processing method according to claim 3 as an embodiment,
Since the base processing of the burnishing processing is performed by the turning processing, the processing steps are largely integrated by continuously performing the base processing and the burnishing processing. Furthermore, in the working method according to claim 4 as an embodiment, since the surface roughness Ra of the rolling surface after the ground processing by turning is set to 0.5 μm or less, the rolling surface is roughened by the subsequent burnishing processing. Ra 0.2 μm
The following is reasonably finished.
【００１７】[0017]
【実施例】以下、本発明を実施例に基づいて具体的に説
明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments.
【００１８】トラクション性能 ＪＩＳ Ｇ ４０５２に規定されるＳＣＭ４２０Ｈ鋼
（１Ｃｒ−１／４Ｍｏ鋼）を後述する試験片の概略形状
に加工したのち、浸炭焼入および焼戻処理を施し、旋盤
加工によって径４０ｍｍ，厚さ２０ｍｍの円筒形試験片
と、同じく径４０ｍｍ，厚さ２０ｍｍであって、円筒面
に曲率半径２０ｍｍのクラウニングを施したクラウニン
グ付き円筒形試験片とを作成した（下地加工）。 次い
で、それぞれの転動面（円筒面およびクラウニング面）
に、表１に示す条件のバニシング加工を施すことによっ
て、それぞれの表面粗さＲａに仕上げた。Traction performance SCM420H steel (1Cr-1 / 4Mo steel) specified in JIS G4052 is processed into a rough shape of a test piece described later, and then carburized and tempered, and a diameter of 40 mm is obtained by lathe processing. A cylindrical test piece having a thickness of 20 mm and a cylindrical test piece having a diameter of 40 mm and a thickness of 20 mm and having a crowning with a radius of curvature of 20 mm were crowned on the cylindrical surface (base processing). Then each rolling surface (cylindrical surface and crowning surface)
Then, the surface roughness Ra was finished by performing burnishing under the conditions shown in Table 1.
【００１９】[0019]
【表１】 [Table 1]
【００２０】そして、図１に示す２円筒転がりすべり試
験装置によって、当該円筒形試験片とクラウニング付き
円筒形試験片とを組み合わせた場合のトラクション性能
について、表１に併せて示す条件の研削加工および超仕
上加工によって同一素材から作成した同様の試験片によ
るトラクション性能と比較調査した。With respect to the traction performance in the case where the cylindrical test piece and the cylindrical test piece with crowning are combined by the two-cylinder rolling / sliding test device shown in FIG. A comparative study was conducted with traction performance using similar test pieces made from the same material by superfinishing.
【００２１】２円筒転がりすべり試験装置は、図１に示
すように、トラクションオイル（＃３７６）を満たした
オイルバス１中に浸漬された円筒形試験片Ｔ1 をタイミ
ングベルト２を介して回転駆動する第１のＡＣサーボモ
ータ３と、同じくオイルバス１中に浸漬されたクラウニ
ング付き円筒形試験片Ｔ2 をタイミングベルト４を介し
て回転駆動する第２のＡＣサーボモータ５と、クラウニ
ング付き円筒形試験片Ｔ2 をＡＣサーボモータ５と共に
移動させ、オイルバス１中において円筒形試験片Ｔ1 に
押し付けるエアシリンダ６から主に構成され、エアシリ
ンダ６により両試験片Ｔ1 およびＴ2 に負荷される荷重
と、円筒形試験片Ｔ1 の支持軸に取付けられたトルクセ
ンサ７によって検出されるトルクからトラクション係数
μを求めるようになっている。 なお、この実施例にお
ける試験条件としては、平均回転数２５００ｒｐｍ，す
べり速度５．２ｍ／ｓ，スリップ率０〜１５％，最大面
圧約１．３ＧＰａを採用した。As shown in FIG. 1, the two-cylinder rolling / sliding test device rotationally drives a cylindrical test piece T1 immersed in an oil bath 1 filled with traction oil (# 376) via a timing belt 2. A first AC servomotor 3, a second AC servomotor 5 for rotatably driving a crowned cylindrical test piece T2 immersed in the oil bath 1 via a timing belt 4, and a crowned cylindrical test piece. It mainly consists of an air cylinder 6 that moves T2 together with the AC servomotor 5 and presses it against the cylindrical test piece T1 in the oil bath 1. The load applied to both test pieces T1 and T2 by the air cylinder 6 and the cylindrical shape The traction coefficient μ is obtained from the torque detected by the torque sensor 7 attached to the support shaft of the test piece T1. I have. As the test conditions in this example, an average rotation speed of 2500 rpm, a sliding speed of 5.2 m / s, a slip ratio of 0 to 15%, and a maximum surface pressure of about 1.3 GPa were adopted.
【００２２】この結果は、図２に示すとおりで、超仕上
加工によって転動面の表面粗さＲａを０．１５μｍに仕
上げた比較例１の場合には、油温の上昇によってトラク
ション係数μの増大が認められるのに対し、バニシング
加工によって転動面の表面粗さＲａを０．１４μｍおよ
び０．１７μｍに仕上げた本発明例１および２の場合に
は、トラクション係数μの増大がなく、超仕上加工によ
って転動面の表面粗さＲａを０．０５μｍ以下に仕上げ
た比較例２（従来例）と同等もしくはそれ以上のトラク
ション性能を示すことが確認された。This result is shown in FIG. 2. In the case of Comparative Example 1 in which the surface roughness Ra of the rolling surface was finished to 0.15 μm by superfinishing, the traction coefficient μ of the oil temperature increased. In contrast, in the case of Examples 1 and 2 of the present invention in which the surface roughness Ra of the rolling surface was finished to 0.14 μm and 0.17 μm by burnishing, there was no increase in the traction coefficient μ, and It was confirmed that the traction performance was equal to or higher than that of Comparative Example 2 (conventional example) in which the surface roughness Ra of the rolling surface was finished to 0.05 μm or less by finishing.
【００２３】転動疲労性能 ＳＣＭ４２０Ｈ鋼を径約５５ｍｍ，板厚約６ｍｍの円板
状に加工したのち、浸炭焼入および焼戻処理を施し、旋
盤加工によって下地加工したのち、円板状素材の一面側
に表２に示す条件のバニシング加工を施すことによっ
て、それぞれの表面粗さＲａに仕上げ、疲労試験片とし
た。Rolling Fatigue Performance SCM420H steel is processed into a disk shape having a diameter of about 55 mm and a plate thickness of about 6 mm, then subjected to carburizing and tempering treatment, and subjected to lathe processing to prepare a base material, and then a disk-shaped material. By subjecting one surface side to a burnishing process under the conditions shown in Table 2, each surface roughness Ra was finished, and a fatigue test piece was obtained.
【００２４】[0024]
【表２】 [Table 2]
【００２５】そして、図３に示す転動疲労試験装置のオ
イルバス１１中に、このように作成した円板状疲労試験
片Ｔ3 を浸漬し、７０〜８０℃に保持したトラクション
オイル中において、約１０ｍｍ径の鋼球１２，１２を試
験片Ｔ3 の仕上加工面に５．２３ＧＰａの面圧で押し当
てると共に、２０００ｒｐｍの速度で回転させることに
よって、仕上加工面（転動面）に剥離が発生する回転数
（剥離寿命）について調査し、研削加工および超仕上加
工によって同一素材から作成した同様の試験片の場合と
比較した。Then, the disk-shaped fatigue test piece T3 thus prepared was immersed in the oil bath 11 of the rolling fatigue test apparatus shown in FIG. When the steel balls 12, 12 having a diameter of 10 mm are pressed against the finished surface of the test piece T3 with a surface pressure of 5.23 GPa and rotated at a speed of 2000 rpm, peeling occurs on the finished surface (rolling surface). The number of rotations (peeling life) was investigated and compared with the case of similar test pieces made from the same material by grinding and superfinishing.
【００２６】その結果は、図４に示すとおりで、バニシ
ング加工によって転動面の表面粗さＲａを０．１０μｍ
および０．１９μｍに仕上げた本発明例３および４の場
合には、研削加工および超仕上加工によって転動面の表
面粗さＲａを０．０２μｍに仕上げた比較例３（従来
例）の場合よりも転動疲労性能に優れることが確認され
た。The results are shown in FIG. 4, and the surface roughness Ra of the rolling surface was 0.10 μm by burnishing.
In the case of the present invention examples 3 and 4 finished to 0.19 μm, and the comparative example 3 (conventional example) in which the surface roughness Ra of the rolling surface was finished to 0.02 μm by grinding and superfinishing. Was also confirmed to have excellent rolling fatigue performance.
【００２７】残留応力 ＳＣＭ４２０Ｈ鋼を径約５０ｍｍ，長さ約６０ｍｍの円
筒状に加工したのち，浸炭焼入および焼戻処理を施し、
旋盤加工による下地加工によって表面粗さＲａを０．２
７μｍ、硬さをＨR Ｃ６３としたのち、当該円筒状試験
片の円筒面に面圧７．３ＧＰａのバニシング加工による
仕上加工を施した結果、仕上面の硬さがＨR Ｃ６７程度
に向上すると共に、表面粗さＲａが０．１９μｍとなっ
た。Residual stress After processing SCM420H steel into a cylindrical shape having a diameter of about 50 mm and a length of about 60 mm, it is carburized and tempered,
The surface roughness Ra is 0.2 by the base processing by lathe processing.
After setting the hardness to 7 μm and the hardness to H R C63, the finish of the cylindrical surface of the cylindrical test piece by vanishing with a surface pressure of 7.3 GPa is improved, and the hardness of the finished surface is improved to about H R C67. At the same time, the surface roughness Ra became 0.19 μm.
【００２８】そして、このように仕上加工した円筒状試
験片の仕上面近傍の残留応力を測定したところ、図５に
示す結果が得られ、表面下０．１〜０．２ｍｍの部分に
おいて１５００ＭＰａ程度の圧縮残留応力が発生してい
ることが確認され、この圧縮残留応力によって転動疲労
性能が向上するものと考えられる。When the residual stress near the finished surface of the cylindrical test piece thus finished was measured, the results shown in FIG. 5 were obtained, and about 1500 MPa in the portion 0.1 to 0.2 mm below the surface. It has been confirmed that the compressive residual stress occurs, and it is considered that the rolling fatigue performance is improved by the compressive residual stress.
【００２９】[0029]
【発明の効果】以上説明したように、本発明の請求項１
に係わるトラクションドライブ転動体表面の仕上加工方
法においては、トラクションドライブ転動体の転動面に
バニシング加工を施すことによって転動面の表面粗さＲ
ａを０．２μｍ以下に仕上げるようにしているので、超
仕上加工を行うことなくトラクション性能を向上させる
ことができると共に、転動面直下位置の圧縮残留応力の
発生によって転動疲労性能を改善することができ、トラ
クション性能および転動疲労性能に優れたトラクション
ドライブ転動体を安価に製造することができるという極
めて優れた効果がもたらされる。As described above, according to the first aspect of the present invention,
In the finishing processing method of the surface of the traction drive rolling element according to the above, the surface roughness of the rolling surface R
Since a is finished to 0.2 μm or less, it is possible to improve the traction performance without performing superfinishing and improve rolling contact fatigue performance by generating compressive residual stress immediately below the rolling contact surface. Therefore, it is possible to manufacture the traction drive rolling element having excellent traction performance and rolling fatigue performance at low cost, which is an extremely excellent effect.
【００３０】本発明に係わるトラクションドライブ転動
体表面の仕上加工方法の実施態様として請求項２に係わ
る加工方法においては、バニシング加工時の面圧を７．
０ＧＰａ以上としているので、転動面に塑性変形および
圧縮残留応力を不足なく発生させることができ、転動疲
労性能を確実に改善することができ、同じく実施態様と
して請求項３に係わる加工方法においては、バニシング
加工の下地加工を旋削加工によって行うようにしている
ので、下地加工とバニシング加工とを連続的に行うこと
ができ、工程の大幅な集約が可能になり、加工コストの
大幅な削減が可能になる。 さらに実施態様として請求
項４に係わる加工方法においては、旋削による下地加工
後の転動面の表面粗さＲａを０．５μｍ以下にしている
ので、その後のバニシング加工が容易なものとなり、転
動面をＲａ０．２μｍ以下の表面粗さに無理なく確実に
仕上げることができるようになるという非常に優れた効
果がもたらされる。As an embodiment of the method for finishing the surface of the traction drive rolling element according to the present invention, in the processing method according to claim 2, the surface pressure during burnishing is set to 7.
Since it is set to 0 GPa or more, plastic deformation and compressive residual stress can be generated on the rolling surface without deficiency, and rolling fatigue performance can be surely improved. Similarly, in the working method according to claim 3, Since the base processing of burnishing processing is performed by turning, it is possible to perform the base processing and the burnishing processing continuously, it is possible to greatly integrate the process, and the processing cost is greatly reduced. It will be possible. Further, in the working method according to claim 4 as an embodiment, since the surface roughness Ra of the rolling surface after the base processing by turning is set to 0.5 μm or less, the subsequent burnishing becomes easy and the rolling A very excellent effect that the surface can be surely finished to have a surface roughness Ra of 0.2 μm or less without difficulty is brought about.
【図１】本発明に係わるトラクションドライブ転動体表
面の仕上加工方法の実施例においてトラクション性能の
調査に用いた２円筒転がりすべり試験装置の構造を示す
概略説明図である。FIG. 1 is a schematic explanatory view showing a structure of a two-cylinder rolling / sliding test device used for investigating traction performance in an example of a method for finishing a surface of a traction drive rolling body according to the present invention.
【図２】本発明に係わるトラクションドライブ転動体表
面の仕上加工方法を適用した試験片によるトラクション
性能を従来の仕上加工方法による試験片の場合と比較し
て示すグラフである。FIG. 2 is a graph showing the traction performance of the test piece to which the finishing method for the surface of the traction drive rolling body according to the present invention is applied, in comparison with the case of the test piece by the conventional finishing method.
【図３】本発明に係わるトラクションドライブ転動体表
面の仕上加工方法の実施例において転動疲労性能の調査
に用いた試験装置の構造を示す概略説明図である。FIG. 3 is a schematic explanatory view showing the structure of a test apparatus used for investigating rolling fatigue performance in an example of a method for finishing a traction drive rolling element surface according to the present invention.
【図４】本発明に係わるトラクションドライブ転動体表
面の仕上加工方法を適用した試験片による転動疲労性能
を従来の仕上加工方法による試験片の場合と比較して示
すワイブル分布図である。FIG. 4 is a Weibull distribution diagram showing rolling fatigue performance of a test piece to which the finishing processing method for the surface of a traction drive rolling body according to the present invention is applied, in comparison with the case of a test piece by a conventional finishing processing method.
【図５】本発明に係わるトラクションドライブ転動体表
面の仕上加工方法を適用した試験片における仕上加工面
近傍の応力分布を示すグラフである。FIG. 5 is a graph showing a stress distribution in the vicinity of a finish machined surface in a test piece to which the traction drive rolling body surface finish machining method according to the present invention is applied.
Claims (4)
バニシング加工を施し、当該転動面の中心線平均粗さＲ
ａを０．２μｍ以下に仕上げることを特徴とするトラク
ションドライブ転動体表面の仕上加工方法。Claim: What is claimed is: 1. A rolling surface of a traction drive rolling element is burnished, and a center line average roughness R of the rolling surface is applied.
A finishing method for the surface of a traction drive rolling element, wherein a is 0.2 μm or less.
上であることを特徴とする請求項１記載のトラクション
ドライブ転動体表面の仕上加工方法。2. The finishing method for the surface of a traction drive rolling element according to claim 1, wherein the surface pressure of the burnishing processing is 7.0 GPa or more.
あることを特徴とする請求項１記載のトラクションドラ
イブ転動体表面の仕上加工方法。3. The finishing method for the surface of a traction drive rolling element according to claim 1, wherein the grounding for the burnishing is turning.
ａが０．５μｍ以下であることを特徴とする請求項３記
載のトラクションドライブ転動体表面の仕上加工方法。4. The center line average roughness R of the rolling surface after base processing.
The method for finishing a surface of a traction drive rolling element according to claim 3, wherein a is 0.5 μm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29693295A JP3440657B2 (en) | 1995-11-15 | 1995-11-15 | Finishing method of traction drive rolling element surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29693295A JP3440657B2 (en) | 1995-11-15 | 1995-11-15 | Finishing method of traction drive rolling element surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09137854A true JPH09137854A (en) | 1997-05-27 |
| JP3440657B2 JP3440657B2 (en) | 2003-08-25 |
Family
ID=17840045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29693295A Expired - Fee Related JP3440657B2 (en) | 1995-11-15 | 1995-11-15 | Finishing method of traction drive rolling element surface |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3440657B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1014723C2 (en) | 2000-03-22 | 2001-09-25 | Skf Eng & Res Centre Bv | Method for finishing the surface of a rolling contact component. |
| JP2002340122A (en) * | 2001-05-14 | 2002-11-27 | Nsk Ltd | Toroidal type continuously variable transmission |
| US6572452B2 (en) | 2000-02-16 | 2003-06-03 | Nsk Ltd. | Disc for toroidal type continuously variable transmission and working method therefor |
| WO2003095855A1 (en) * | 2002-05-14 | 2003-11-20 | Koyo Seiko Co., Ltd. | Method of producing bearing raceway member |
| EP1235002A3 (en) * | 2001-02-21 | 2009-04-22 | Nissan Motor Company, Limited | Traction drive rotary assembly |
-
1995
- 1995-11-15 JP JP29693295A patent/JP3440657B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6572452B2 (en) | 2000-02-16 | 2003-06-03 | Nsk Ltd. | Disc for toroidal type continuously variable transmission and working method therefor |
| US6893376B2 (en) | 2000-02-16 | 2005-05-17 | Nsk Ltd. | Disc for toroidal type continuously variable transmission and working method therefor |
| NL1014723C2 (en) | 2000-03-22 | 2001-09-25 | Skf Eng & Res Centre Bv | Method for finishing the surface of a rolling contact component. |
| WO2001071208A1 (en) | 2000-03-22 | 2001-09-27 | Skf Engineering & Research Centre B.V. | Method for finishing the surface of a rolling contact component |
| EP1235002A3 (en) * | 2001-02-21 | 2009-04-22 | Nissan Motor Company, Limited | Traction drive rotary assembly |
| JP2002340122A (en) * | 2001-05-14 | 2002-11-27 | Nsk Ltd | Toroidal type continuously variable transmission |
| WO2003095855A1 (en) * | 2002-05-14 | 2003-11-20 | Koyo Seiko Co., Ltd. | Method of producing bearing raceway member |
| CN100339606C (en) * | 2002-05-14 | 2007-09-26 | 株式会社捷太格特 | Method for manufacturing a bearing raceway member |
| US7685717B2 (en) | 2002-05-14 | 2010-03-30 | Jtekt Corporation | Method for manufacturing a bearing raceway member |
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|---|---|
| JP3440657B2 (en) | 2003-08-25 |
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