WO2014156206A1 - 電蝕防止用転がり軸受 - Google Patents

電蝕防止用転がり軸受 Download PDF

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Publication number
WO2014156206A1
WO2014156206A1 PCT/JP2014/050048 JP2014050048W WO2014156206A1 WO 2014156206 A1 WO2014156206 A1 WO 2014156206A1 JP 2014050048 W JP2014050048 W JP 2014050048W WO 2014156206 A1 WO2014156206 A1 WO 2014156206A1
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Prior art keywords
rolling bearing
ceramic
outer ring
sprayed coating
inner ring
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PCT/JP2014/050048
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English (en)
French (fr)
Japanese (ja)
Inventor
志向 虻川
水津　竜夫
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トーカロ株式会社
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Priority to CN201480017826.7A priority Critical patent/CN105051390A/zh
Publication of WO2014156206A1 publication Critical patent/WO2014156206A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/64—Special methods of manufacture
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
    • C23C4/11—Oxides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/134—Plasma spraying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F16C33/586—Details of specific parts of races outside the space between the races, e.g. end faces or bore of inner ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/62—Selection of substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/067—Fixing them in a housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2206/00—Materials with ceramics, cermets, hard carbon or similar non-metallic hard materials as main constituents
    • F16C2206/40—Ceramics, e.g. carbides, nitrides, oxides, borides of a metal
    • F16C2206/42—Ceramics, e.g. carbides, nitrides, oxides, borides of a metal based on ceramic oxides
    • F16C2206/44—Ceramics, e.g. carbides, nitrides, oxides, borides of a metal based on ceramic oxides based on aluminium oxide (Al2O3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2223/00—Surface treatments; Hardening; Coating
    • F16C2223/30—Coating surfaces
    • F16C2223/42—Coating surfaces by spraying the coating material, e.g. plasma spraying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

Definitions

  • the present invention relates to a rolling bearing, and more particularly to a rolling bearing for preventing electric corrosion in which electric corrosion caused by current generated in an electric motor of a railway vehicle or the like is prevented by coating a ceramic spray coating.
  • a rolling bearing provided with a metal outer ring and a metal inner ring disposed concentrically with the outer ring via a rolling element on the inner side in the radial direction of the outer ring as a bearing for a rotating shaft or the like of an electric motor of a railway vehicle Is commonly used.
  • a current generated by the electric motor or the like flows through an outer ring, a rolling element, and an inner ring.
  • the current flowing through the rolling bearing sparks at the contact surface between the rolling elements and the inner and outer rings, and electric corrosion occurs on the outer ring, the rolling elements, and the inner ring that form a current path. Electrical corrosion not only degrades the performance of rolling bearings, but also causes a reduction in life.
  • the outer surface of the outer ring of the rolling bearing that contacts the housing may be covered with an insulating material.
  • a ceramic material is suitable, and in order to coat with the ceramic material, a ceramic film is formed on the outer surface of the outer ring of the rolling bearing by a thermal spraying method.
  • Patent Document 1 and Patent Document 2 describe an electric corrosion prevention rolling bearing in which the outer surface of the outer ring of the rolling bearing is roughened and a ceramic sprayed coating of 0.15 to 0.45 mm is formed on the surface. Yes.
  • a rolling bearing in which a ceramic sprayed coating made of gray alumina containing aluminum oxide and titanium oxide is formed on the outer surface of the outer ring with a predetermined thickness (Patent Document 3).
  • a rolling bearing is known in which a ceramic sprayed coating having alumina as a main component and titanium oxide content of 0.01 to 0.2% by weight is formed on the outer surface of an outer ring (Patent Document 4).
  • the particle size of the ceramic powder for forming the ceramic spray coating is 10 to 50 ⁇ m.
  • Patent Document 5 a ceramic sprayed coating having a porosity of 2 to 6% is formed on the outer surface of the outer ring and further filled with an organic sealant.
  • the surface of the outer ring attached to the housing is coated with a ceramic coating layer and two metal layers thereon.
  • Patent Document 7 describes a rolling bearing in which the outer surface of the outer ring of the rolling bearing is roughened to Ra of 1.0 to 3.0 ⁇ m and a ceramic film is formed on the roughened surface.
  • an object of the present invention is to provide a rolling bearing for preventing electric corrosion that can greatly improve durability.
  • a rolling bearing for preventing electric corrosion of the present invention includes a metal outer ring, a metal inner ring that is concentrically disposed via the outer ring and a plurality of rolling elements, and is relatively rotatable, and the outer ring or the A ceramic sprayed coating for preventing electric corrosion formed on the outer surface of the inner ring by a plasma spraying method, and the volume resistivity of the ceramic sprayed coating is 10 6 ⁇ cm to 10 13 ⁇ cm, It is a rolling bearing for corrosion prevention.
  • the volume resistivity of the ceramic sprayed coating is set to 10 6 ⁇ cm to 10 13 ⁇ cm, and the current is not completely cut off while maintaining the insulation performance, so that a very large voltage is applied.
  • local electric field concentration does not occur. Therefore, even if a momentary load with a very large voltage is repeated for a long period of time, the insulation performance is not impaired, and damage to the rolling bearing for preventing electrolytic corrosion is prevented. Thereby, durability can be improved significantly.
  • the film thickness of the ceramic sprayed coating is preferably 50 ⁇ m to 100 ⁇ m.
  • the effect of reducing the manufacturing cost is great, and the mechanical strength is reduced due to the shear stress generated between the outer ring and the inner ring of the rolling bearing and the residual stress inside the film in a usage environment with a large temperature difference. It is difficult to occur, and damage such as peeling or cracking of the film can be prevented.
  • the ceramic spray coating is composed of a material mainly composed of aluminum oxide and titanium oxide
  • the content of aluminum oxide is set to 60% by weight to 98% by weight
  • the content may be 2 wt% to 40 wt%.
  • the ceramic sprayed coating is subjected to a sealing treatment with an organic resin, and the surface roughness Ra after the finishing treatment applied after the sealing treatment is less than 1 ⁇ m, and the skewness Rsk is less than 0.
  • the surface roughness Ra of the surface layer is less than 1 ⁇ m and the skewness Rsk, which is a measure of surface irregularities, is less than 0, there are few protrusions on the surface. Therefore, the electric field concentration occurring on the surface when a current flows can be reduced, and the durability can be further improved.
  • the surface roughness before spraying of the outer surface of the outer ring or the inner ring coated with the ceramic spray coating is Ra: 0.5 ⁇ m to 2.0 ⁇ m, high adhesion to the ceramic spray coating can be obtained. it can.
  • the ceramic sprayed coating is preferably formed using a powder having an average particle diameter of 3 ⁇ m to 15 ⁇ m as a raw material.
  • a ceramic sprayed coating having a volume resistivity of 10 6 ⁇ cm to 10 13 ⁇ cm is formed so that the current is not completely cut off while maintaining the insulation performance. Can be improved.
  • FIG. 1 is a cross-sectional view of a rolling bearing for preventing electrolytic corrosion according to an embodiment of the present invention in which a ceramic sprayed coating is formed on an outer ring. It is sectional drawing of the rolling bearing for electrolytic corrosion prevention which concerns on other embodiment which formed the ceramic sprayed coating in the inner ring
  • FIG. 1 is a cross-sectional view of a rolling bearing 1 for preventing electric corrosion according to an embodiment of the present invention.
  • the rolling bearing 1 for preventing electric corrosion is a ball bearing using balls as rolling elements, and is a ring-shaped metal outer ring 2 and a ring-shaped metal that is arranged concentrically with the outer ring 2 and is relatively rotatable.
  • the inner ring 3 is mainly composed of a made inner ring 3, a ring-shaped cage 4 arranged between the outer ring 2 and the inner ring 3, and a plurality of rolling elements 5 held by the cage 4.
  • this invention is not limited to this embodiment, It applies to the rolling bearing for an electric corrosion prevention provided with another shape, a form, or another member. Examples of other electric corrosion prevention rolling bearings include a tapered roller bearing and a cylindrical roller bearing.
  • An outer ring side raceway surface 2a having a circular arc shape is formed on the inner periphery of the outer ring 2, and outer ring side small diameter portions 2b and the like are formed on both sides of the outer ring side raceway surface 2a.
  • An inner ring side raceway surface 3a having a circular arc shape is formed on the outer periphery of the inner ring 3, and inner ring side small diameter portions 3b and the like are formed on both sides of the inner ring side raceway surface 3a.
  • the cage 4 has a plurality of pocket portions 4a in the circumferential direction, and a metallic and spherical rolling element 5 is rotatably held in each pocket portion 4a.
  • the plurality of rolling elements 5 roll on the outer ring side raceway surface 2 a and the inner ring side raceway surface 3 a, and the rolling element 5 moves in the same direction as the rotation direction of the inner ring 3.
  • the cage 4 that holds the plurality of rolling elements 5 also moves in the same direction as the rolling elements 5.
  • the electric corrosion prevention rolling bearing 1 is mainly applied to a rolling bearing that supports a rotating shaft of an electric motor, a generator, or an electric device of a vehicle, and current generated by the electric motor or the like generates an outer ring 2, a rolling element 5, an inner ring 3. It is a rolling bearing that prevents electric corrosion from occurring in the rolling bearing 1 for preventing electric corrosion when flowing through the shaft.
  • the outer ring 2 is fixed in contact with a housing (not shown) for attaching the rolling bearing 1 for preventing electric corrosion.
  • An electrolytic corrosion preventing function is imparted to the entire outer surface 21 of the outer ring 2 that is a contact portion with the housing. Increasing the electric resistance of the outer surface 21 of the outer ring 2 makes it difficult for a local current such as a spark to flow through the rolling bearing 1 for preventing electric corrosion, thereby preventing electric corrosion.
  • a ceramic spray coating 10 is formed on the outer surface 21 of the outer ring 2.
  • the ceramic sprayed coating 10 is formed on the outer ring 2, but a similar ceramic sprayed coating may be formed on the outer surface 31 of the inner ring 3 as shown in FIG. In this case, the outer surface 31 of the inner ring 3 comes into contact with a rotating shaft (not shown).
  • Ceramic materials for forming a thermal spray coating generally, Al 2 O 3 , MgO, TiO 2 , Cr 2 O 3 , ZrO 2 , HfO 2 , SiO 2 , Y 2 O 3 , Al 2 O 3 .TiO 2 , Al 2 O 3 .SiO 2 , Al 2 O 3 .MgO, and the like are known.
  • a ceramic constituting the ceramic sprayed coating 10 of the present embodiment a material mainly composed of aluminum oxide, titanium oxide, or the like can be used.
  • gray alumina Al 2 O 3 , TiO 2
  • alumina yttria 3Al 2 O 3 ⁇ 5Y 2 O 3
  • alumina magnesia Mg ⁇ Al 2 O 4
  • alumina ⁇ silica 3Al 2 O 3 ⁇ 2SiO 2
  • gray alumina mainly composed of aluminum oxide and titanium oxide is suitable.
  • White alumina (Al 2 O 3 ), which has a high dielectric breakdown voltage and a high volume resistivity, is known as a material for a ceramic spray coating for preventing electrolytic corrosion.
  • the gray alumina (Al 2 O 3 , TiO 2 ) contains titanium oxide, which is a conductive material. Gray alumina has a lower volume resistivity than white alumina, and a dielectric breakdown voltage lower than that of white alumina. .
  • a major reason for selecting gray alumina is low insulation due to the low volume resistivity. Moreover, the film formability can also be improved.
  • the melting point of titanium oxide (TiO 2 ) is lower than that of white alumina.
  • the titanium oxide (TiO 2 ) is more easily adhered to the metal substrate than the case where the aluminum oxide (Al 2 O 3 ) is 100%, and a uniform film is formed. Cheap. Therefore, the yield is better when gray alumina is selected, and the manufacturing cost can be reduced.
  • gray alumina which is a material mainly composed of aluminum oxide and titanium oxide is most preferably used. It is done.
  • the content of aluminum oxide in the ceramic sprayed coating is set to 60 wt% to 98 wt%, and the content of titanium oxide is set to 2 wt% to 40 wt%. More preferably, the content of aluminum oxide is 70 to 90% by weight, and the content of titanium oxide is 10 to 30% by weight.
  • the volume resistivity of the ceramic sprayed coating 10 is adjusted to 10 6 ⁇ cm to 10 13 ⁇ cm.
  • a more preferable range of the volume resistivity of the ceramic sprayed coating 10 is 10 8 ⁇ cm to 10 10 ⁇ cm.
  • the reason why a relatively large amount of titanium oxide is contained in the ceramic sprayed coating is that the volume resistivity is adjusted to 10 6 ⁇ cm to 10 13 ⁇ cm to obtain a low insulating property.
  • the current is not completely cut off while maintaining the required insulation performance. By doing so, local electric field concentration does not occur even when a very large voltage is applied. Therefore, even if a momentary load with a very large voltage is repeated for a long period of time, the insulation performance is not impaired, and damage to the electric corrosion prevention rolling bearing 1 is prevented for a long period of time.
  • a strong shear stress may occur at the interface between the outer ring 2 or the inner ring 3 of the rolling bearing 1 for preventing electric corrosion and the ceramic sprayed coating 10.
  • the shear stress acts as a force to peel the ceramic sprayed coating 10 from the outer ring 2 or the inner ring 3 and causes peeling of the coating.
  • there is a residual stress due to thermal shrinkage that occurs during film formation inside the ceramic sprayed coating 10 and the mechanical strength may decrease due to the influence of the residual stress, leading to a decrease in impact resistance.
  • the film thickness of the ceramic sprayed coating 10 of the present embodiment is 50 ⁇ m to 100 ⁇ m, which is an extremely thin coating, so that the shear stress is small and the coating is hardly peeled off.
  • the residual stress at the time of film formation is small, it is difficult to cause a decrease in mechanical strength. Accordingly, damage such as peeling or cracking of the film can be prevented.
  • the significance of setting the upper limit of the film thickness of the ceramic sprayed coating 10 to 100 ⁇ m is as described above, and the lower limit of the film thickness is set to 50 ⁇ m because the insulating performance cannot be maintained if the film thickness is smaller than this.
  • what is necessary is just to adjust the film-forming time, for example, in order to control the film thickness of the ceramic sprayed coating 10.
  • the surface layer of the ceramic sprayed coating 10 is subjected to a sealing treatment to close the pores.
  • the thermal spray coating generally has pores in principle, and depending on the pore structure of the thermal spray coating, gas or liquid may permeate the coated substrate. If the sealing treatment is not performed, for example, water enters the pores and the insulating performance is lowered.
  • the sealing agent not only seals the pores of the sprayed layer, but also has a function of maintaining the adhesion of the coating after the sealing treatment.
  • the porosity of the ceramic sprayed coating 10 is set to 6% or less. When the porosity of the ceramic sprayed coating 10 is larger than 6%, the sealing agent may not be sufficiently filled, and the function of the sealing agent cannot be exhibited.
  • the porosity can be controlled by adjusting the particle size of the ceramic powder, adjusting the distance between the spray gun and the outer surfaces 21 and 31 of the outer ring 2 or inner ring 3 to be treated, and adjusting the pressure of the spraying atmosphere. it can.
  • the organic resin for sealing treatment may be any resin that has fluidity so as to enter the pores of the ceramic sprayed coating 10.
  • synthetic resins include, for example, bisphenol F type epoxy resin, bisphenol A type epoxy resin, epoxy resin such as polyglycidyl (meth) acrylate, acrylic resin, fluorine resin, urethane resin, phenol resin, xylene resin, polyester resin, unsaturated resin
  • Known synthetic resins such as polyester resins, polyamide resins, and melamine resins can be used. These can be used alone or in admixture of two or more.
  • the ceramic spray coating 10 is formed by spraying ceramic powder having an average particle size of 3 ⁇ m to 15 ⁇ m.
  • the porosity of the sprayed layer can be controlled to 6% or less, and variation in pore size can be suppressed.
  • a ceramic powder having a small particle diameter as in this embodiment, a ceramic sprayed coating 10 having small pores and uniform pore sizes can be obtained. If the pore size can be made uniform, the filling degree of the sealing agent can be improved, which is advantageous from the viewpoint of suppressing the variation in insulating performance.
  • the average particle size of the ceramic powder is desirably small, but if it is too small, the fluidity of the ceramic powder may decrease during the thermal spraying process for forming the thermal spray coating, and there is a possibility that it cannot be stably supplied. If the ceramic powder is unevenly conveyed, the coating strength tends to vary and the thickness tends to be non-uniform. From such a viewpoint, it is preferable to use a ceramic powder having an average particle diameter in the range of 3 ⁇ m to 15 ⁇ m, more preferably 3 ⁇ m to 12 ⁇ m. When the average particle size of the ceramic powder exceeds 15 ⁇ m, a portion where the film is formed without being completely melted is formed, and the portion becomes excessively porous so that it becomes difficult to fill the sealing agent, and the insulating performance is deteriorated.
  • the ceramic sprayed coating 10 is subjected to a sealing treatment with an organic resin and then subjected to a finishing treatment such as polishing, and the surface properties are controlled so that the surface roughness Ra is less than 1 ⁇ m and the skewness Rsk is less than 0. Yes.
  • the surface roughness Ra defined in JISB0660 and the skewness Rsk defined in JISB0601 are used as indices.
  • the skewness Rsk is a physical quantity obtained by dividing the cube average of the height deviation in the reference length by the cube of the root mean square.
  • the skewness Rsk is a mathematical index that expresses the difference in surface irregularities, and serves as a standard indicating the symmetry of the irregularities on the target surface.
  • the value of the skewness Rsk is greatly influenced by the presence of a small number of protrusions and valleys remaining on the surface after polishing.
  • the skewness Rsk has a positive value when there are sharp protrusions on the surface and the convex area of the surface roughness is large, and approaches zero when the protrusions and valleys are symmetric. When the concave area of the surface roughness is large, a negative value is shown. Therefore, the outer ring 2 or the inner ring 3 of the rolling bearing 1 for preventing electric corrosion having a surface roughness Ra of less than 1 ⁇ m and a skewness Rsk of less than 0 has a surface property with very few sharp protrusions.
  • the surface properties may be controlled by adjusting the particle size of the ceramic powder during spraying.
  • the ceramic spray coating 10 is obtained by supplying ceramic powder into a heat source, spraying the ceramic powder on the outer surfaces 21 and 31 of the outer ring 2 or the inner ring 3 while heating and melting it, and depositing molten particles.
  • the ceramic powder is supplied in units of tens of thousands of pieces continuously into the heat source. As a result, particles having different flatness are deposited randomly.
  • the surface roughness Ra and skewness Rsk can be controlled to show the above values by using ceramic powder having an average particle size in the range of 3 ⁇ m to 15 ⁇ m as in this embodiment. Furthermore, the surface roughness Ra and the skewness Rsk can easily exhibit the above values by performing a sealing treatment with an organic resin.
  • the ceramic sprayed coating 10 is formed by any one of the atmospheric plasma spraying method, the low pressure plasma spraying method, the high-speed flame spraying method, the gas flame spraying method, the arc spraying method, the water plasma spraying method, the electric arc spraying method, and the explosion spraying method.
  • the film forming conditions by each thermal spraying method may be appropriately set according to the base material, raw material powder, film thickness, manufacturing environment, and the like.
  • the plasma spraying method is a thermal spraying method using electric energy as a heat source, and forms a film using argon or hydrogen as a plasma generation source. Since the heat source temperature is high and the frame speed is high, a high melting point ceramic material can be densely formed, which is suitable for the method of manufacturing the ceramic sprayed coating 10.
  • An example of a process for obtaining the ceramic sprayed coating 10 is to clean the outer surfaces 21 and 31 of the outer ring 2 or the inner ring 3 which is a base material, roughening the outer surfaces 21 and 31 by blasting, under The coating treatment, the thermal spraying of the ceramic sprayed coating 10 as the top coat, the sealing treatment of the surface layer of the ceramic sprayed coating 10, and the surface polishing treatment are performed in this order.
  • the undercoat process may be omitted depending on the difference in the thermal spray material, and other processes such as a preheating process may be included.
  • the undercoat improves the adhesion between the outer surfaces 21 and 31 of the outer ring 2 or the inner ring 3 and the ceramic sprayed coating 10 and prevents peeling or cracking of the coating.
  • the undercoat is not necessarily provided, and when the ceramic powder is directly sprayed onto the outer ring 2 or the inner ring 3, the spraying conditions may be employed so that the ceramic powder can be completely melted.
  • the average particle diameter of the ceramic powder may be in the range of 3 ⁇ m to 15 ⁇ m as in this embodiment, and the plasma heat source, the flight speed of the plasma particles, etc. may be optimized.
  • the ceramic sprayed coating 10 is formed on the outer surface 21 of the outer ring 2 or the outer surface 31 of the inner ring 3 of the rolling bearing 1 for preventing electric corrosion, for example, a rotating shaft of an electric motor for a railway vehicle, power generation Even if a voltage is generated on the rotating shaft of the machine, the rolling bearing 1 that supports the rotating shaft can exhibit an electrolytic corrosion preventing effect. Even when a high voltage of, for example, about 3 kV is repeatedly applied to the outer surfaces 21 and 31 of the outer ring 2 or the inner ring 3 over a long period of time, it is possible to continue to maintain the electrolytic corrosion prevention effect.
  • the ceramic sprayed coating 10 is provided in a single layer structure on the outer ring 2 or the inner ring 3 of the rolling bearing 1 for preventing electric corrosion.
  • different ceramic sprayed coatings may be formed in multiple layers, or the ceramic sprayed coating.
  • Another metal layer may be provided on the upper layer.
  • the volume resistivity of the ceramic sprayed coating 10 is set to 10 6 ⁇ cm to 10 13 ⁇ cm, and the current is not completely cut off while maintaining the insulation performance. Therefore, even when a very large voltage is applied, local electric field concentration does not occur. Therefore, even if a momentary load with a very large voltage is repeated for a long period of time, the insulation performance is not impaired, and damage to the electric corrosion prevention rolling bearing 1 is prevented. Thereby, durability can be improved significantly.
  • a test piece having a composition, film thickness, sealing treatment, substrate surface roughness, post-film formation surface roughness, and volume resistivity is manufactured and insulated on the surface of the metal substrate. Destructibility was evaluated. The dielectric breakdown property was evaluated by conducting a dielectric breakdown test and visually confirming the presence or absence of dielectric breakdown.
  • the dielectric breakdown test method is as follows. An 80 ⁇ 80 mm aluminum foil is placed in the center on the surface on which the test piece is formed, and a voltage is applied between the aluminum foil and the back side of the test piece. Gradually increase the voltage from 0 kV and apply up to 3 kV to confirm the presence or absence of dielectric breakdown (spark). As a withstand voltage tester, TOS-5101 manufactured by Kikusui Electronics Co., Ltd. was used.
  • the film thickness was measured using a standard outer micrometer M100 manufactured by Mitutoyo Corporation, and the surface roughness was measured using 2800G manufactured by Tokyo Seimitsu Surfcom.
  • the volume resistivity measurement method is as follows. An 80 ⁇ 80 mm aluminum foil is placed in the center on the surface on which the test piece is formed, and a voltage is applied between the aluminum foil and the back side of the test piece. The resistance value R is calculated by dividing the voltage by the current flowing at that time.
  • the volume resistivity ⁇ is expressed as follows using the area S (8 ⁇ 8 cm) and the film thickness d (cm).
  • One side of a SS400 flat plate of 100 x 100 x 10 mm is first roughened by blasting, then ceramic spraying is performed, the surface layer on which the film is formed is subjected to sealing treatment, and finally polishing finish is performed to obtain a test piece.
  • polishing finish was performed after ceramic spraying.
  • the roughening treatment was performed by alumina grid blasting
  • the sealing treatment was performed by applying an epoxy sealant and then firing
  • the final polishing finish was performed using a flat polishing machine.
  • a film may be formed on a curved surface of a cylindrical structure, for example.
  • evaluation is performed using a flat test piece. This is because the volume resistivity and dielectric breakdown voltage of the film are hardly affected by the shape of the substrate, and a more rigorous evaluation result is obtained by comparing with a flat test piece that easily obtains uniform conditions.
  • thermal spraying conditions are as follows. Thermal spraying method: plasma spraying method, current value: 600 A, argon gas flow rate: 40 NLPM, hydrogen gas flow rate: 8.5 NLPM, spraying distance: 100 mm, ladder scan (gun feed rate: 600 mm / sec, 3 mm pitch).
  • Table 1 shows the composition (titania content), film thickness, presence / absence of sealing treatment, substrate surface roughness, post-film surface roughness, volume resistivity, and dielectric breakdown test results of each example and comparative example.
  • the substrate surface roughness is the roughness after roughening one side of a flat plate by blasting, and the surface roughness after film formation is to seal the formed surface layer, It is the surface roughness after polishing finish. In the case of no sealing treatment, it is the surface roughness after the film-formed surface is polished.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
PCT/JP2014/050048 2013-03-28 2014-01-07 電蝕防止用転がり軸受 WO2014156206A1 (ja)

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US20220003273A1 (en) * 2018-09-27 2022-01-06 Ntn Corporation Anti-electrolytic corrosion rolling bearing
US11542985B2 (en) 2018-09-26 2023-01-03 Ntn Corporation Rolling bearing and wind power generation rotor shaft support device

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JP7134639B2 (ja) 2017-03-24 2022-09-12 アクティエボラゲット・エスコーエッフ 電気絶縁層を含む転がり軸受
WO2020067334A1 (ja) * 2018-09-26 2020-04-02 Ntn株式会社 転がり軸受、および風力発電用主軸支持装置
JP7304710B2 (ja) * 2018-09-27 2023-07-07 Ntn株式会社 電食防止転がり軸受用溶射材
US11920862B2 (en) 2019-12-19 2024-03-05 Praxair Technology, Inc. Methods and apparatuses for using dry ice containers
CN118434702A (zh) * 2022-03-31 2024-08-02 东华隆株式会社 陶瓷热喷涂覆膜的表面处理方法和陶瓷热喷涂覆膜
CN116695072A (zh) * 2023-05-11 2023-09-05 东华隆（广州）表面改质技术有限公司 一种调配辊体表面电阻涂层电阻率的pvd镀膜方法
WO2025037563A1 (ja) * 2023-08-14 2025-02-20 Ntn株式会社 転がり軸受の設計方法

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