JP3613535B2 - Rolling bearings for rotating parts of computer peripherals - Google Patents

Description

表１中、アンデロン値のＭ、Ｈの欄はそれぞれ測定用周波数帯域の区分で、Ｍは中周波数帯域（３００〜１，８００Ｈｚ）、Ｈは高周波数帯域（１，８００〜１０，０００Ｈｚ）を示しており、アンデロン値は小である程、振動、騒音が少なく、静粛性に優れていることを表す。
【００１９】
この結果から本実施例の玉軸受は従来の玉軸受に比べて、振動、騒音が低く静粛性に優れていることがわかる。
【００２０】
図２は本発明の他の実施例を示したものであり、軸４の外周に形成された内周転動溝４ａと外輪１の内周に形成された外周転動溝１ａとの間に複数個のボール３を設けたものとしてある。
【００２１】
この実施例のものにおいても、上述の図１に示した第１実施例のものと同様に外輪１および軸４の素材には前記ステンレス鋼を使用し、ボール３には高炭素クロム軸受鋼を使用する。
【００２２】
なお、上述した第１実施例においては外輪１、内輪２の双方を、第２実施例においては外輪１、軸４の双方をともに本発明独自のステンレス鋼で構成してあるが、使用条件によっては耐蝕性、接着強度の安定が必要な一方だけをステンレス鋼で構成して、他方には高炭素クロム軸受鋼を使用してもよい。
【００２３】
【発明の作用、効果】
本発明に係る転がり軸受は上述した構成のものとしてあるので、次の作用、効果を奏し得る。
【００２４】
素材たるステンレス鋼の鋼材中に含まれるチタンおよび酸素をともに１０ｐｐｍ以下にして非金属介在物の発生を極めて低レベルに抑えてあるので、鋼材の組織が均一かつ緻密であり、転がり軸受の転動溝の加工を高精度に行うことができ、転がり軸受の静粛性および回転精度を格段に向上せしめることができる。
【００２５】
また、素材たるステンレス鋼中の非金属介在物は鋼材の組織に比べて硬いものであって、従来のステンレス鋼による転がり軸受では、転動溝の表面に現れる非金属介在物が使用時に転動体の表面を摩耗せしめる原因となっていたが、本発明の転がり軸受の素材たるステンレス鋼では非金属介在物の存在率を極めて低レベルに抑えてあるので、転動体の摩耗が少なく、転がり軸受の寿命を延ばすことができる。
【００２６】
さらに、転がり軸受の外表面に現れて耐蝕性が要求される内外輪や軸をステンレス鋼で構成してあるが、軸受の内部に設けられていて耐蝕性が要求されない転動体はステンレス鋼よりも高精度の加工が容易でかつ安価な高炭素クロム軸受鋼で構成することができるので、耐蝕性、回転精度および静粛性に優れ、しかも構成要素の全てをステンレス鋼とする転がり軸受に比べてコストを低減することができる。
【図面の簡単な説明】
【図１】本発明に係る転がり軸受の実施例を示す縦断面図。
【図２】本発明に係る転がり軸受の他の実施例を示す縦断面図。
【符号の説明】
１ 外輪
１ａ 外周転動溝
２ 内輪
２ａ 内周転動溝
３ ボール
４ 軸[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling bearing, and more particularly to a rolling bearing used in a rotating part of a computer peripheral device .
[0002]
[Prior art and its problems]
The inner ring, outer ring, and rolling elements that make up a conventional rolling bearing are usually composed of a single material, which is made of high carbon chrome bearing steel or SUS440C grade martensitic stainless steel, and has high corrosion resistance. Stainless steel is used as a required rolling bearing material.
[0003]
Although stainless steel has good corrosion resistance, it is caused by chemical changes in eutectic carbides with large diameters caused by eutectic reaction when molten steel solidifies, and impurities in the raw materials in molten steel. When non-metallic inclusions such as alumina exist, and when cutting steel, high-precision cutting is performed due to a difference in machinability between the eutectic carbide and non-metallic inclusions and the steel structure. In particular, in rolling bearings, the rolling grooves of the inner and outer rings cannot be machined with high accuracy, so the rotational accuracy cannot be improved, and the noise generated by vibration during rotation is large. It could not be used for rotating parts of precision instruments such as precision measuring instruments and computer peripherals.
[0004]
In some conventional rolling bearings, the eutectic carbide diameter is made as small as about 10 μm, for example, by controlling the heat treatment in the manufacturing process of the stainless steel as a material so that the processing accuracy can be improved. However, there is nothing that suppresses the occurrence of non-metallic inclusions in the steel material, and it has not been possible to manufacture a highly accurate rolling bearing.
[0005]
The present invention makes the diameter of eutectic carbides in steel materials small, suppresses the occurrence of non-metallic inclusions to an extremely low level, and forms the inner and outer rings of rolling bearings with stainless steel with a uniform and dense steel structure. Thus, an object of the present invention is to provide a rolling bearing excellent in quietness.
[0006]
[Means for solving the problems]
In order to achieve the above-mentioned object, a rolling bearing for a rotating part of a computer peripheral device according to claim 1 of the present invention is an inner ring or outer ring of a rolling bearing in which rolling elements are provided between rolling grooves of inner and outer rings. At least one of them in a weight ratio, carbon is 0.60 to 0.75%, chromium is 10.5 to 13.5%, silicon is 1.0% or less, manganese is 0.3 to 0.8%, A martensitic stainless steel in which the remainder is composed of iron and impurities inevitably mixed, the hardness is HRC58 or more, the diameter of the eutectic carbide is 10 μm or less, and the amount of oxygen and titanium in the steel is 10 ppm or less, respectively. By configuring, the bearing is excellent in corrosion resistance, has a uniform and dense steel structure, has improved rolling workability of rolling grooves, and has excellent quietness .
[0007]
According to a second aspect of the present invention, there is provided a rolling bearing for a rotating part of a computer peripheral device , wherein a rolling groove is formed on the outer periphery of the shaft, and the rolling element is formed between the rolling groove and the rolling groove on the inner periphery of the outer ring. At least one of the shaft and outer ring of the rolling bearing provided with a weight ratio of carbon is 0.60 to 0.75%, chromium is 10.5 to 13.5%, and silicon is 1.0% or less. , Manganese is 0.3 to 0.8%, the remainder is composed of iron and impurities inevitably mixed, the hardness is HRC58 or more, the diameter of the eutectic carbide is 10 μm or less, the amount of oxygen and titanium in the steel Are made of martensitic stainless steel, each of which is 10 ppm or less, thereby providing a bearing having excellent corrosion resistance, a uniform and dense steel structure, improved rolling workability of rolling grooves, and excellent quietness .
[0008]
In an embodiment of the present invention, the rolling element is made of high carbon chromium bearing steel.
[0009]
【Example】
Hereinafter, specific examples of the rolling bearing according to the present invention will be described with reference to the accompanying drawings.
[0010]
In FIG. 1, reference numeral 1 denotes an outer ring having a rolling groove 1a formed on the inner periphery, 2 denotes an inner ring having a rolling groove 2a formed on the outer periphery, and a plurality of rolling elements as rolling elements are provided between the rolling grooves of the inner and outer rings. A ball 3 is provided.
[0011]
In this embodiment, the material of the outer ring 1 and the inner ring 2 of the ball bearing is made of the following unique stainless steel, and the ball 3 is made of high carbon chromium bearing steel.
[0012]
Stainless steels constituting the inner and outer rings are in a weight ratio of carbon of 0.60 to 0.75%, chromium of 10.5 to 13.5%, silicon of 1.0% or less, and manganese of 0.3 to 0 .8%, the remainder is iron and impurities inevitably mixed, the hardness is HRC58 or more, and the eutectic carbide diameter is 10 μm or less by controlling the heat treatment, and the amounts of oxygen and titanium in the steel are respectively It is comprised with the martensitic stainless steel which is 10 ppm or less.
[0013]
Therefore, the above-mentioned stainless steel raw materials are those containing as little titanium as impurities, and the titanium content in the steel is controlled to 10 ppm or less, and the titanium and nitrogen in the molten steel are combined. The occurrence of non-metallic inclusions caused by titanium such as titanium nitride is suppressed to an extremely low level.
[0014]
Also, in the manufacturing process of stainless steel, the oxygen in the steel material is reduced to 10 ppm or less by lengthening the degassing time in the molten steel, and the trace amount of aluminum and oxygen contained in the raw material are combined. Occurrence of non-metallic inclusions due to oxygen, such as alumina produced by this, and silicon oxide produced by combining silicon and oxygen as raw materials, is also suppressed to an extremely low level.
[0015]
The ball bearing configured as described above has a small diameter of eutectic carbide in the stainless steel constituting the inner and outer rings and suppresses the occurrence of non-metallic inclusions to an extremely low level, so that the metal structure is uniform and dense. Yes, high-precision processing can be performed, and the quietness and rotational accuracy of the ball bearing can be improved.
[0016]
Table 1 shows the results (Anderon value) obtained by conducting an evaluation test of vibration and noise (silentness) on the ball bearing of this example in accordance with the standard of AFBMA (The Anti-Friction Bearings Association, Inc.). This is shown in comparison with the test results of a conventional ball bearing in which inner and outer rings are made of high grade stainless steel.
[0017]
In the conventional ball bearing, high carbon chromium bearing steel was used for the ball as in the present embodiment.
[0018]
[Table 1]

In Table 1, the M and H columns of the Anderon values are divisions of the frequency band for measurement, M is the medium frequency band (300 to 1,800 Hz), and H is the high frequency band (1,800 to 10,000 Hz). It shows that the smaller the Anderon value, the less the vibration and noise, and the better the silence.
[0019]
From this result, it can be seen that the ball bearing of the present example has lower vibration and noise and excellent quietness than the conventional ball bearing.
[0020]
FIG. 2 shows another embodiment of the present invention. Between the inner peripheral rolling groove 4 a formed on the outer periphery of the shaft 4 and the outer peripheral rolling groove 1 a formed on the inner periphery of the outer ring 1. A plurality of balls 3 are provided.
[0021]
In this embodiment as well, the stainless steel is used for the material of the outer ring 1 and the shaft 4 as in the first embodiment shown in FIG. use.
[0022]
In the first embodiment described above, both the outer ring 1 and the inner ring 2 are made of stainless steel unique to the present invention in the second embodiment, and both the outer ring 1 and the shaft 4 are made of stainless steel unique to the present invention. May be constructed of stainless steel for only one of which needs stability of corrosion resistance and adhesive strength, and high carbon chromium bearing steel may be used for the other.
[0023]
[Operation and effect of the invention]
Since the rolling bearing according to the present invention has the above-described configuration, the following actions and effects can be obtained.
[0024]
The generation of non-metallic inclusions is suppressed to an extremely low level by making both titanium and oxygen contained in the stainless steel material 10 ppm or less, and the structure of the steel material is uniform and dense. The moving groove can be processed with high accuracy, and the quietness and rotational accuracy of the rolling bearing can be remarkably improved.
[0025]
In addition, non-metallic inclusions in the stainless steel material are harder than the structure of the steel material, and in conventional rolling bearings made of stainless steel, non-metallic inclusions appearing on the surface of the rolling groove are rolling elements when in use. However, in stainless steel, which is the material of the rolling bearing of the present invention, the presence of non-metallic inclusions is suppressed to an extremely low level. Life can be extended.
[0026]
Furthermore, the inner and outer rings and shafts that appear on the outer surface of the rolling bearing and require corrosion resistance are made of stainless steel, but the rolling elements that are provided inside the bearing and do not require corrosion resistance are more resistant than stainless steel. Since it can be made of high-carbon chromium bearing steel that is easy to process with high accuracy and is inexpensive, it has excellent corrosion resistance, rotational accuracy, and quietness, and costs are lower than rolling bearings that use stainless steel for all of the components. Can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a rolling bearing according to the present invention.
FIG. 2 is a longitudinal sectional view showing another embodiment of the rolling bearing according to the present invention.
[Explanation of symbols]
1 Outer ring 1a Outer peripheral rolling groove 2 Inner ring 2a Inner peripheral rolling groove 3 Ball 4 Axis

Claims (2)

A rolling bearing for a rotating part of a computer peripheral device, wherein at least one of an inner ring and an outer ring of a rolling bearing in which rolling elements are provided between rolling grooves of inner and outer rings has a carbon ratio of 0.60 to 60%. 0.75%, chromium is 10.5 to 13.5%, silicon is 1.0% or less, manganese is 0.3 to 0.8%, the remainder is composed of iron and inevitable impurities, hardness Is composed of martensitic stainless steel having an HRC of 58 or more, a diameter of eutectic carbide of 10 μm or less, and an amount of oxygen and titanium in the steel material of 10 ppm or less, respectively , and has excellent corrosion resistance and a uniform steel structure. A rolling bearing for a rotating part of a computer peripheral device , which is a compact bearing having excellent quietness with improved rolling processability of rolling grooves . A rolling bearing for a rotating part of a computer peripheral device, in which a rolling groove is formed on the outer periphery of the shaft, and a rolling bearing shaft provided with rolling elements between the rolling groove and the rolling groove on the outer periphery of the outer ring, The weight ratio of at least one of the outer rings is 0.60 to 0.75% for carbon, 10.5 to 13.5% for chromium, 1.0% or less for silicon, and 0.3 to 0 for manganese. .8%, the balance is composed of iron and impurities inevitably mixed, the hardness is HRC58 or more, the diameter of the eutectic carbide is 10 μm or less, and the amount of oxygen and titanium in the steel is 10 ppm or less respectively. A rolling bearing for a rotating part of a computer peripheral device , which is made of a stainless steel and has excellent corrosion resistance, a uniform and dense steel structure, improved rolling processability of rolling grooves, and excellent quietness .

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