JP2012154463A - Rolling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling device that has superior lubricity and is long-lived, such as a rolling bearing, a liner guide device, a ball screw, and a linear motion bearing.SOLUTION: On raceway surfaces 1a, 2a and a rolling contact surface 3, shot peening treatment is applied which injects a mixed projection material including a hard injection material composed of iron-base ceramics powder and a soft projection material composed of at least either of soft metal powder and solid lubricant powder, and a composite structure layer 10 and a lubrication coating 12 stacked on the composite structure layer 10 are formed. The iron-base ceramics powder is composed of a FeB system iron-base boride of the area ratio of 50% to 90%, and an iron-base solid solution of the area ratio of 10% to 50%, having a body-centered space lattice structure and/or a face-centered space lattice structure, has a microstructure in which a FeB system iron-base boride is surrounded with an iron-base solid solution, or a microstructure in which a FeB system iron-base boride is surrounded with the eutectic of an iron-base solid solution and a FeB system iron-base boride, and contains a boride of 5 mass% to 8 mass% as element, and the rest is iron and inevitable impurities.

Description

  The present invention relates to a rolling device such as a rolling bearing, a linear guide device, a ball screw, a linear motion bearing and the like.

In rolling bearings, a technique is known in which a lubricating coating is provided on a raceway surface of a raceway ring or a rolling surface of a rolling element to improve lubricity and extend the life. For example, Patent Document 1 discloses a technique for providing a lubricating coating by shot peening of chromium powder or nickel powder.
In addition, a technique is known in which a compressive residual stress is applied to the raceway surface of the bearing ring of a rolling bearing to suppress damage to the raceway surface and extend the life. Patent Document 2 discloses a technique for applying compressive residual stress by shot peening of substantially spherical ceramic particles.

JP 2007-146890 A JP 2008-151235 A JP 2008-51180 A Japanese Patent No. 2949794 JP 2008-138262 A Japanese Patent Laid-Open No. 2007-50766 JP 2000-230544 A JP 2006-329319 A

However, the lubricating coating formed by the technique disclosed in Patent Document 1 has a problem that the adhesion to the surface of the base material is not sufficient. For this reason, the lubricating coating is peeled off from the surface of the base material, the lubricity is lowered, and there is a case where a sufficiently long life is not achieved.
Further, the technique disclosed in Patent Document 2 has a problem in that a rolling bearing may have a poor lubrication in a dilute lubrication environment because a coating is not formed on the surface of the base material to be protected.
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve the above-described problems of the prior art and to provide a rolling device that is excellent in lubricity and has a long life.

In order to solve the above problems, the present invention has the following configuration. That is, the rolling device according to one aspect of the present invention includes a first member and a second member having raceways arranged to face each other, a raceway surface of the first member, and a raceway surface of the second member. A rolling device arranged such that it can freely roll between, wherein one of the first member and the second member moves relative to the other through the rolling of the rolling member, At least one of the raceway surface of the first member, the raceway surface of the second member, and the rolling surface of the rolling element has a hard projecting material made of iron-based ceramic powder, soft metal powder, and solid lubricant powder. A shot peening process for injecting a mixed projection material including at least one soft projection material, and a composite tissue layer in which the soft projection material permeates a base material and the soft projection material. A lubricating coating laminated on the composite structure layer; Is formed, the iron-based ceramic powder has a Fe ₂ B Keitetsumoto borides 50% to 90% in area ratio, a body-centered cubic lattice structure and / or face-centered cubic lattice structure, the area ratio in 10% to 50% of the iron-based solid solution, made from the Fe ₂ B Keitetsumoto microstructure around the boride enclosed said iron-based solid solution, or, in the Fe ₂ B Keitetsumoto borides In addition to having a microstructure surrounded by a eutectic of the iron-based solid solution and the Fe ₂ B-based iron-based boride, the element contains 5% by mass to 8% by mass of boron, with the balance being iron And inevitable impurities.

Moreover, the rolling device according to another aspect of the present invention includes a first member and a second member having raceways arranged to face each other, a raceway surface of the first member, and a raceway surface of the second member. A rolling element that is arranged so as to be freely rollable between the rolling elements, wherein one of the first member and the second member moves relative to the other through the rolling of the rolling element. At least one of the raceway surface of the first member, the raceway surface of the second member, and the rolling surface of the rolling element, a hard projection material made of iron-based ceramic powder, a soft metal powder, and a solid lubricant powder A shot peening process for injecting a mixed projection material comprising at least one of the above, a composite tissue layer in which the soft projection material penetrates the base material, and the soft projection material And a lubricating coating laminated on the composite structure layer, It made which are, the iron-based ceramic powder has a Fe ₂ B Keitetsumoto borides 90% more than 50% or less in area ratio, a body-centered cubic lattice structure and / or face-centered cubic lattice structure, the area ratio in 10% to 50% of the iron-based solid solution, made from the Fe ₂ B Keitetsumoto microstructure around the boride enclosed said iron-based solid solution, or, in the Fe ₂ B Keitetsumoto borides In addition to having a microstructure surrounded by a eutectic of the iron-based solid solution and the Fe ₂ B-based iron-based boride, the element contains 5% by mass to 8% by mass of boron, and 10% by mass or less. It contains at least one of titanium and molybdenum of 10% by mass or less, and the balance is iron and inevitable impurities.

Furthermore, the rolling device according to still another aspect of the present invention includes a first member and a second member having raceways arranged to face each other, a raceway surface of the first member, and a raceway surface of the second member. A rolling element that is arranged so as to be freely rotatable between the first member and the second member via the rolling of the rolling element. At least one of the raceway surface of the first member, the raceway surface of the second member, and the rolling surface of the rolling element, a hard projection material made of iron-based ceramic powder, a soft metal powder, and a solid lubricant A shot peening process for injecting a mixed projection material comprising at least one of powder, and a composite tissue layer in which the soft projection material permeates a base material, and the soft projection material A lubrication jacket constructed and laminated on the composite structure layer When has been formed, the iron-based ceramic powder has a Fe ₂ B Keitetsumoto borides 90% more than 50% or less in area ratio, a body-centered cubic lattice structure and / or face-centered cubic lattice structure , the iron-based solid solution of 10% to 50% in area ratio, made, the Fe ₂ B Keitetsumoto microstructure around the boride enclosed said iron-based solid solution, or the Fe ₂ B Keitetsumoto While having a microstructure in which the eutectic of the iron-based solid solution and the Fe ₂ B-based iron-based boride is surrounded around the boride, the element contains 5% by mass to 8% by mass of boron, and 25% by mass. % Or less of chromium and 10% by mass or less of nickel, and the balance is iron and inevitable impurities.

Furthermore, the rolling device according to still another aspect of the present invention includes a first member and a second member having raceways arranged to face each other, a raceway surface of the first member, and a raceway surface of the second member. A rolling element that is arranged so as to be freely rotatable between the first member and the second member via the rolling of the rolling element. At least one of the raceway surface of the first member, the raceway surface of the second member, and the rolling surface of the rolling element, a hard projection material made of iron-based ceramic powder, a soft metal powder, and a solid lubricant A shot peening process for injecting a mixed projection material comprising at least one of powder, and a composite tissue layer in which the soft projection material permeates a base material, and the soft projection material A lubrication jacket constructed and laminated on the composite structure layer When has been formed, the iron-based ceramic powder has a Fe ₂ B Keitetsumoto borides 90% more than 50% or less in area ratio, a body-centered cubic lattice structure and / or face-centered cubic lattice structure , the iron-based solid solution of 10% to 50% in area ratio, made, the Fe ₂ B Keitetsumoto microstructure around the boride enclosed said iron-based solid solution, or the Fe ₂ B Keitetsumoto While having a microstructure in which the eutectic of the iron-based solid solution and the Fe ₂ B-based iron-based boride is surrounded around the boride, the element contains 5% by mass to 8% by mass of boron, and 10% by mass. % Of titanium and 10% by mass or less of molybdenum and 25% by mass or less of chromium and 10% by mass or less of nickel, and the balance being iron and inevitable impurities Rolling device

In the rolling device according to each of these aspects, the surface subjected to the shot peening treatment among the raceway surface of the first member, the raceway surface of the second member, and the rolling surface of the rolling element is a surface. It is preferable that the residual stress at −1500 MPa or more and −500 MPa or less and the residual stress at a depth position 10 μm inside from the surface is −200 MPa or less.
Further, the surface subjected to the shot peening treatment among the raceway surface of the first member, the raceway surface of the second member, and the rolling surface of the rolling element is an area ratio of 1% or more, A lubricating coating is preferably provided.

Further, the soft metal powder has an average particle size of 1 μm or more and 70 μm or less, and contains at least one of tin, zinc, copper, nickel, chromium, and titanium, and the solid lubricant powder has an average particle size of The diameter is preferably 1 μm or more and 70 μm or less, and preferably contains at least one of molybdenum disulfide, graphite, and polytetrafluoroethylene.
Furthermore, it is preferable that the ratio of the hard projection material in the mixed projection material is 30% by mass or more and 90% by mass or less.
Furthermore, it is preferable that the injection pressure of the mixed projection material is 0.2 MPa or more and 0.8 MPa or less and the injection time is 5 minutes or more and 30 minutes or less.

  The present invention can be applied to various rolling devices. For example, a rolling bearing, a ball screw, a linear guide device, a linear motion bearing, and the like. The first member in the present invention is an inner ring when the rolling device is a rolling bearing, a screw shaft when it is a ball screw, a guide rail when it is a linear guide device, and a linear motion bearing. Means each axis. The second member is an outer ring when the rolling device is a rolling bearing, a nut when it is a ball screw, a slider when it is a linear guide device, and an outer cylinder when it is also a linear bearing. Each means.

  The rolling device according to the present invention includes a hard projection material made of iron-based ceramic powder and a soft metal powder on at least one of the raceway surface of the first member, the raceway surface of the second member, and the rolling surface of the rolling element. And a soft projection material composed of at least one of solid lubricant powder, and a shot peening process for injecting a mixed projection material including the composite structure layer in which the soft projection material penetrates the base material, and the soft projection Since the lubricating film made of the material and laminated on the composite structure layer is formed, it has excellent lubricity and has a long life.

It is a fragmentary longitudinal cross-section which shows the structure of the deep groove ball bearing which is one Embodiment of the rolling device which concerns on this invention. It is process drawing explaining a shot peening process. It is a graph which shows the measurement result of residual stress.

DESCRIPTION OF EMBODIMENTS Embodiments of a rolling device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a partial longitudinal sectional view showing a structure of a deep groove ball bearing which is an embodiment of a rolling device according to the present invention.
The deep groove ball bearing of FIG. 1 includes an inner ring 1 (first member) having a raceway surface 1a on an outer peripheral surface and an outer ring 2 (second member) having a raceway surface 2a facing the raceway surface 1a of the inner ring 1 on the inner peripheral surface. A plurality of rolling elements (balls) 3 that are arranged to freely roll between the raceway surfaces 1a and 2a, a cage 4 that holds the rolling elements 3 between the inner ring 1 and the outer ring 2, and an inner ring 1 and an outer ring. Sealing devices 5 and 5 (for example, contact or non-contact rubber seals or shields) covering the opening of the gap between the two, and one of the inner ring 1 and the outer ring 2 is switched to the other through the rolling of the rolling element 3. On the other hand, relative rotation is possible.

In the bearing inner space surrounded by the inner ring 1, the outer ring 2, and the sealing devices 5, 5, a lubricant G (for example, a lubricant G that lubricates both the raceway surfaces 1 a, 2 a and the rolling surface 3 a of the rolling element 3). (Lubricating oil, grease) is disposed and sealed in the bearing internal space by the sealing devices 5 and 5. Note that the cage 4, the sealing device 5, and the lubricant G may not be provided.
At least one of the raceway surface 1a of the inner ring 1, the raceway surface 2a of the outer ring 2, and the rolling surface 3a of the rolling element 3 has a hard projection material made of iron-based ceramic powder, a soft metal powder, and a solid lubricant powder. A shot peening process for injecting a mixed projection material including at least one of the soft projection materials is performed.

The inner ring 1, the outer ring 2, and the rolling element 3 are made of a metal material (base material) such as bearing steel. As a result of the shot peening process, the processed surface subjected to the shot peening process is complex. A tissue layer 10 and a lubricating film 12 laminated on the composite tissue layer 10 are formed (see FIG. 2).
The composite structure layer 10 is a layer in which a soft projection material penetrates (enters) a base material that is plastically flowed by injection of a hard projection material. The lubricating coating 12 is a coating formed by attaching a soft projection material on the composite tissue layer 10.

  Since the raceway surfaces 1a and 2a and the rolling surface 3a are covered with the lubricating film 12, the deep groove ball bearing of this embodiment has excellent lubricity, and in particular, does not cause poor lubrication even in a lean lubrication environment. Surface damage such as peeling is less likely to occur. Moreover, since the composite structure layer 10 formed by the folding effect is interposed as an intermediate layer between the base material and the lubricating coating 12, the adhesion of the lubricating coating 12 to the base material is excellent. Therefore, since the lubricating coating 12 is hardly peeled off from the base material, the lubricity is hardly lowered. For these reasons, the deep groove ball bearing of this embodiment has excellent lubricity and a long life.

Moreover, since the composite structure layer 10 and the lubricating coating 12 are formed by injecting the mixed projection material, the number of steps can be reduced as compared with the method of injecting the soft projection material after injecting the hard projection material. it can. Further, in the above-described method of spraying the hard projection material and the soft projection material separately, since the composite structure layer is not formed, the lubricating coating is easily peeled off from the base material, but according to the shot peening process of this embodiment, the composite structure layer 10 is formed, the lubricating coating 12 is difficult to peel off from the base material.
In order to sufficiently enhance the lubricity of the deep groove ball bearing and to have a long service life, the portion of the surface to be treated (the raceway surfaces 1a and 2a and the rolling surface 3a) having a lubricating coating is 1% in area ratio. The above is preferable.

  Moreover, high compressive residual stress is provided to the to-be-processed surface by injecting a hard projection material. Thereby, since the fatigue strength of the raceway surfaces 1a and 2a and the rolling surface 3a is improved, the deep groove ball bearing of this embodiment has a long life. In order to sufficiently improve the fatigue strength, the residual stress on the surface of the processing surface is preferably −1500 MPa or more and −500 MPa or less, and the residual stress at a depth position 10 μm inside from the surface is −200 MPa or less. It is preferable to do.

  Furthermore, since the hard projection material can be reused, it is possible to repeatedly perform shot peening treatment by collecting the hard projection material after injection. As a result, the cost of the shot peening process can be reduced. In addition, it is preferable that the ratio of the hard projection material among mixed projection materials is 30 mass% or more and 90 mass% or less. If it is less than 30% by mass, the residual stress may not be sufficiently applied. On the other hand, if it exceeds 90% by mass, the lubricating coating 12 may be difficult to be formed.

Furthermore, in the shot peening treatment, the spray pressure of the mixed projection material is preferably 0.2 MPa or more and 0.8 MPa or less, and the spray time is preferably 5 minutes or more and 30 minutes or less. If the injection time is less than 5 minutes, the shot peening process may not be sufficiently performed. On the other hand, even if it goes beyond 30 minutes, not only the effect cannot be expected, but the cost becomes high.
Here, the iron-based ceramic powder will be described in detail. The iron-based ceramic powder is an iron-based ceramic powder containing iron (Fe) as a main component and boron (B) in an amount of 5% by mass to 8% by mass. That is, the element contains 5% by mass or more and 8% by mass or less of boron, with the balance being iron and inevitable impurities.

With such a composition, this iron-based ceramic is composed of an Fe ₂ B-based iron-based boride and an iron-based solid solution having a body-centered cubic lattice structure and / or a face-centered cubic lattice structure, and Fe ₂ B-based iron It has a hypereutectic structure of a phase of a base boride and a phase of an iron-based solid solution having a body-centered cubic lattice structure and / or a face-centered cubic lattice structure. Fe ₂ B Keitetsumoto boride and the ratio of the iron-based solid solution, an area ratio, Fe ₂ B Keitetsumoto borides: iron solid solution = 50%: 50% to 90%: 10%. The area ratio can be obtained by image analysis of a backscattered electron image of a sample in which iron-based ceramic powder is filled with resin.

Further, the iron-based ceramics, Fe ₂ B Keitetsumoto microstructure surrounded the iron-based solid solution around the boride, or around the Fe ₂ B Keitetsumoto boride, iron solid solution and Fe ₂ B system It has a microstructure surrounded by eutectic with iron-based borides.
Such an iron-based ceramic can be produced by an atomizing method or a quenching ribbon crushing method. By producing by these methods, a high-hardness Fe ₂ B-based iron-based boride that becomes primary crystals is converted into a tough iron-based solid solution or an eutectic of the iron-based solid solution and Fe ₂ B-based iron-based boride. Therefore, it is possible to achieve both a high hardness exceeding HV1000 and a high toughness higher than that of general ceramics, and at a low cost.

Fe ₂ B iron-based boride has a relatively low melting point of Fe ₂ B (about 1400 ° C.) and can be produced by an atomizing method or a rapid ribbon pulverization method. It can be manufactured using cheaper raw materials. If the ratio of the Fe ₂ B iron-based boride is less than 50% in terms of area ratio, it is difficult to obtain sufficient hardness, and if it exceeds 90%, it is difficult to obtain sufficient toughness.

Further, since the iron-based solid solution uses Fe ₂ B-based iron-based boride as the hard phase, the final solidification site is a tough iron-based solid solution or iron-based solid solution and Fe ₂ B-based iron-based boride. Eutectic. In addition, the constituent phase of the iron-based solid solution can have a body-centered cubic lattice structure and / or a face-centered cubic lattice structure depending on the solid solution element, cooling rate, heat treatment, etc., but both phases have sufficient toughness. Therefore, either one or both can be used. When the ratio of the iron-based solid solution is less than 10% in terms of area ratio, it is difficult to obtain sufficient toughness, and when it exceeds 50%, it is difficult to obtain sufficient hardness.

Furthermore, if the boron content in the iron-based ceramic is less than 5% by mass, Fe ₂ B is reduced and it is difficult to obtain sufficient hardness. On the other hand, if it exceeds 8 mass%, since Fe ₂ B is too large, sufficient toughness is difficult to obtain.
Further, the iron-based ceramics, Fe ₂ B Keitetsumoto microstructure surrounded the iron-based solid solution around the boride, or around the Fe ₂ B Keitetsumoto boride, iron solid solution and Fe ₂ B-type iron By having a microstructure surrounded by the eutectic with the base boride, the high toughness phase surrounds the high hardness phase, so that both high hardness and high toughness can be achieved.

  However, as an element, an iron group containing 5% by mass or more and 8% by mass or less of boron, 10% by mass or less of titanium, and 10% by mass or less of molybdenum, with the balance being iron and inevitable impurities. Ceramics can also be used. Further, an iron group containing 5% by mass or more and 8% by mass or less of boron as an element and at least one of 25% by mass or less of chromium and 10% by mass or less of nickel, with the balance being iron and inevitable impurities Ceramics can also be used. Furthermore, as an element, at least one of 5% by mass to 8% by mass of boron, 10% by mass of titanium and 10% by mass of molybdenum, 25% by mass of chromium and 10% by mass of nickel at least On the other hand, iron-based ceramics containing iron and the balance being iron and inevitable impurities can also be used.

The projection material is often stored in the atmosphere, but it is preferable that the projection material does not rust during storage or use. Since chromium and nickel have the effect of improving the corrosion resistance, it is preferable to add them in the range of 25% by mass or less in the case of chromium and 10% by mass or less in the case of nickel. However, when these upper limit values are exceeded, the melting point rises, making it difficult to produce by the atomizing method or the quenching ribbon crushing method.
Titanium and molybdenum are both added for the purpose of improving the hardness. However, if it exceeds 10% by mass, the melting point rises, making it difficult to produce iron-based ceramics by the atomizing method or the quenching ribbon pulverization method.

Next, the soft metal powder and the solid lubricant powder will be described. The kind of soft metal powder is not particularly limited, but powders of tin, zinc, copper, nickel, chromium, and titanium are preferable. Moreover, the mixed powder which mixed 2 or more types of these metal powders may be sufficient. The average particle size of the soft metal powder is preferably 1 μm or more and 70 μm or less.
The type of solid lubricant powder is not particularly limited, but molybdenum disulfide, graphite, and polytetrafluoroethylene powders are preferred. Also, a mixed powder obtained by mixing two or more of these solid lubricant powders may be used. The average particle size of the solid lubricant powder is preferably 1 μm or more and 70 μm or less.
If the average particle size of the soft metal powder and the solid lubricant powder is less than 1 μm, the powder tends to fly and scatter during the shot peening process, which may make the process difficult. On the other hand, if it exceeds 70 μm, the surface roughness of the surface to be processed becomes rough, which may be inappropriate as a raceway surface or a rolling surface.

  In addition, this embodiment shows an example of this invention and this invention is not limited to this embodiment. For example, as the metal material (base material) constituting the inner ring 1, the outer ring 2, and the rolling element 3, high-carbon chromium steel for bearings represented by SUJ2 and SUJ3 may be used, and carburizing such as SCM420 and SCr420. Steel or stainless steel may be used. Furthermore, the inner ring 1, the outer ring 2, and the rolling element 3 do not need to be made of the same type of metal material. For example, the rolling element 3, the inner ring 1, and the outer ring 2 may be different steel types.

  Further, in the present embodiment, the deep groove ball bearing has been described as an example of the rolling device, but the type of the rolling bearing is not limited to the deep groove ball bearing, and the present invention is applicable to various types of rolling bearings. It can be applied to. For example, radial rolling bearings such as angular contact ball bearings, self-aligning ball bearings, self-aligning roller bearings, needle roller bearings, tapered roller bearings, cylindrical roller bearings, and thrust types such as thrust ball bearings and thrust roller bearings This is a rolling bearing. Furthermore, the present invention can be applied not only to rolling bearings but also to various types of various rolling devices. For example, a ball screw, a linear guide device, a linear motion bearing, or the like.

〔Example〕
Hereinafter, the present invention will be described more specifically with reference to examples. First, a description will be given of a result of performing shot peening treatment on a roller that is a rolling element of a thrust roller bearing and measuring a residual stress on the surface to be treated.
An FeCrB ceramic powder having an average particle size of 44 μm manufactured by a gas atomization method, a tin powder having an average particle size of 38 μm, and a mixed powder of these two powders (FeCrB ceramic powder: tin powder = 3 parts by mass: 1 part by mass) are prepared. And it was set as the projection material.

  Each blasting material was sprayed onto a cylindrical surface of a roller having a diameter of 3 mm and a length of 6 mm (spray pressure was 0.4 MPa, spray time was 20 minutes), and a shot peening treatment was performed. Example 1 shows a roller subjected to shot peening treatment using mixed powder, Comparative Example 1 shows a roller subjected to shot peening treatment using tin powder, and Comparative Example shows a roller subjected to shot peening treatment using FeCrB ceramic powder. 2. In addition, about the roller which performed the shot peening process using the tin powder, the shot peening process using the FeCrB ceramic powder is performed as the pretreatment, and the shot peening process using the tin powder is performed thereafter.

With respect to the obtained three types of rollers and untreated rollers, the residual stress on the surface (cylindrical surface) and the residual stress at the depth position inside the predetermined depth from the surface were measured. The results are shown in the graph of FIG. As can be seen from the graph of FIG. 3, when the shot peening treatment was performed using the mixed powder, the compressive residual stress on the surface was about 1.2 times higher than that of the untreated product. In addition, a compressive residual stress equivalent to the surface was applied even at a depth position 10 μm inside from the surface.
Furthermore, as a result of measuring the amount of tin adhering to the surface by surface analysis, the area ratio for Example 1 was 10%, and the area ratio for Comparative Example 1 was 40%.

Next, a life test of the roller bearing was performed. A flat washer made of SUJ2 subjected to mirror surface treatment was used as an inner and outer ring, and this was assembled with 14 rollers and a cage to obtain a roller bearing. A thrust load of 6370 N was applied to the roller bearing, and the roller bearing was rotated at a rotation speed of 1000 min ⁻¹ at room temperature. The roller bearing was lubricated using mineral oil having a viscosity of 10 cSt as a lubricant.

  A life test was performed on five bearings per one type of roller bearing, and the average value was defined as the life of the roller bearing. When the life of each roller bearing is expressed as a relative value when the life of the roller bearing incorporating the untreated roller is 1, the life of the roller bearing incorporating the roller of Example 1 is 20, and the roller of Comparative Example 1 The life 12 of the roller bearing incorporating the roller was 5. The life of the roller bearing incorporating the roller of Comparative Example 2 was 5. Thus, the life of the roller bearing incorporating the roller of Example 1 was about 1.5 times that of the conventional roller bearing incorporating the roller of Comparative Example 1.

DESCRIPTION OF SYMBOLS 1 Inner ring 1a Raceway surface 2 Outer ring 2a Raceway surface 3 Rolling element 3a Rolling surface 10 Composite structure layer 12 Lubrication coating

Claims (9)

A first member and a second member having raceway surfaces arranged opposite to each other, and rolling elements arranged to roll between the raceway surface of the first member and the raceway surface of the second member, A rolling device in which one of the first member and the second member moves relative to the other through the rolling of the rolling element,
At least one of the raceway surface of the first member, the raceway surface of the second member, and the rolling surface of the rolling element, a hard projection material made of iron-based ceramic powder, a soft metal powder, and a solid lubricant powder A shot peening process for injecting a mixed projection material comprising at least one of the above, a composite tissue layer in which the soft projection material penetrates the base material, and the soft projection material And a lubricating film laminated on the composite structure layer is formed,
The iron-based ceramic powder has an area ratio of 50% to 90% Fe ₂ B iron-based boride, a body-centered cubic lattice structure and / or a face-centered cubic lattice structure, and an area ratio of 10% to 50%. % or less and iron-based solid solution, made from the Fe ₂ B Keitetsumoto said about the boride iron solid solution enclosed microstructure, or the around the Fe ₂ B Keitetsumoto borides iron It has a microstructure surrounded by a eutectic of a solid solution and the Fe ₂ B-based iron-based boride, and contains 5% by mass or more and 8% by mass or less of boron as an element, with the balance being iron and inevitable impurities. A rolling device characterized by being. A first member and a second member having raceway surfaces arranged opposite to each other, and rolling elements arranged to roll between the raceway surface of the first member and the raceway surface of the second member, A rolling device in which one of the first member and the second member moves relative to the other through the rolling of the rolling element,
At least one of the raceway surface of the first member, the raceway surface of the second member, and the rolling surface of the rolling element, a hard projection material made of iron-based ceramic powder, a soft metal powder, and a solid lubricant powder A shot peening process for injecting a mixed projection material comprising at least one of the above, a composite tissue layer in which the soft projection material penetrates the base material, and the soft projection material And a lubricating film laminated on the composite structure layer is formed,
The iron-based ceramic powder has an area ratio of 50% to 90% Fe ₂ B iron-based boride, a body-centered cubic lattice structure and / or a face-centered cubic lattice structure, and an area ratio of 10% to 50%. % or less and iron-based solid solution, made from the Fe ₂ B Keitetsumoto said about the boride iron solid solution enclosed microstructure, or the around the Fe ₂ B Keitetsumoto borides iron While having a microstructure surrounded by a eutectic of a solid solution and the Fe ₂ B-based iron-based boride, the elements include boron of 5% by mass to 8% by mass, titanium of 10% by mass and less, and 10% by mass. A rolling device comprising at least one of the following molybdenum, the balance being iron and inevitable impurities. A first member and a second member having raceway surfaces arranged opposite to each other, and rolling elements arranged to roll between the raceway surface of the first member and the raceway surface of the second member, A rolling device in which one of the first member and the second member moves relative to the other through the rolling of the rolling element,
At least one of the raceway surface of the first member, the raceway surface of the second member, and the rolling surface of the rolling element, a hard projection material made of iron-based ceramic powder, a soft metal powder, and a solid lubricant powder A shot peening process for injecting a mixed projection material comprising at least one of the above, a composite tissue layer in which the soft projection material penetrates the base material, and the soft projection material And a lubricating film laminated on the composite structure layer is formed,
The iron-based ceramic powder has an area ratio of 50% to 90% Fe ₂ B iron-based boride, a body-centered cubic lattice structure and / or a face-centered cubic lattice structure, and an area ratio of 10% to 50%. % or less and iron-based solid solution, made from the Fe ₂ B Keitetsumoto said about the boride iron solid solution enclosed microstructure, or the around the Fe ₂ B Keitetsumoto borides iron While having a microstructure surrounded by a eutectic of a solid solution and the Fe ₂ B-based iron-based boride, the elements include boron of 5% by mass to 8% by mass, chromium of 25% by mass or less, and 10% by mass. A rolling device comprising at least one of the following nickel, the balance being iron and inevitable impurities. A first member and a second member having raceway surfaces arranged opposite to each other, and rolling elements arranged to roll between the raceway surface of the first member and the raceway surface of the second member, A rolling device in which one of the first member and the second member moves relative to the other through the rolling of the rolling element,
At least one of the raceway surface of the first member, the raceway surface of the second member, and the rolling surface of the rolling element, a hard projection material made of iron-based ceramic powder, a soft metal powder, and a solid lubricant powder A shot peening process for injecting a mixed projection material comprising at least one of the above, a composite tissue layer in which the soft projection material penetrates the base material, and the soft projection material And a lubricating film laminated on the composite structure layer is formed,
The iron-based ceramic powder has an area ratio of 50% to 90% Fe ₂ B iron-based boride, a body-centered cubic lattice structure and / or a face-centered cubic lattice structure, and an area ratio of 10% to 50%. % or less and iron-based solid solution, made from the Fe ₂ B Keitetsumoto said about the boride iron solid solution enclosed microstructure, or the around the Fe ₂ B Keitetsumoto borides iron While having a microstructure surrounded by a eutectic of a solid solution and the Fe ₂ B-based iron-based boride, the elements include boron of 5% by mass to 8% by mass, titanium of 10% by mass and less, and 10% by mass. A rolling device comprising at least one of the following molybdenum and at least one of 25 mass% or less of chromium and 10 mass% or less of nickel, the balance being iron and inevitable impurities.   Of the raceway surface of the first member, the raceway surface of the second member, and the rolling surface of the rolling element, the surface subjected to the shot peening treatment has a residual stress on the surface of −1500 MPa to −500 MPa, The rolling device according to any one of claims 1 to 4, wherein a residual stress at a depth position on the inner side of 10 µm from the surface is -200 MPa or less.   Of the raceway surface of the first member, the raceway surface of the second member, and the rolling surface of the rolling element, the surface subjected to the shot peening treatment has an area ratio of 1% or more, and the lubricating coating The rolling device according to claim 1, wherein the rolling device is provided.   The soft metal powder has an average particle size of 1 μm or more and 70 μm or less and contains at least one of tin, zinc, copper, nickel, chromium, and titanium, and the solid lubricant powder has an average particle size of It is 1 micrometer or more and 70 micrometers or less, and contains at least 1 sort (s) among molybdenum disulfide, graphite, and polytetrafluoroethylene, The rolling device as described in any one of Claims 1-6 characterized by the above-mentioned.   The rolling device according to claim 1, wherein a ratio of the hard projecting material in the mixed projecting material is 30% by mass or more and 90% by mass or less.   9. The rolling device according to claim 1, wherein an injection pressure of the mixed projection material is 0.2 MPa or more and 0.8 MPa or less, and an injection time is 5 minutes or more and 30 minutes or less. .

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