WO2016157572A1 - Roulement à rouleaux doté d'une isolation pour la prévention de la corrosion électrolytique, et son procédé de fabrication - Google Patents

Roulement à rouleaux doté d'une isolation pour la prévention de la corrosion électrolytique, et son procédé de fabrication Download PDF

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Publication number
WO2016157572A1
WO2016157572A1 PCT/JP2015/076506 JP2015076506W WO2016157572A1 WO 2016157572 A1 WO2016157572 A1 WO 2016157572A1 JP 2015076506 W JP2015076506 W JP 2015076506W WO 2016157572 A1 WO2016157572 A1 WO 2016157572A1
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WO
WIPO (PCT)
Prior art keywords
alumina
zirconia
insulating
outer ring
thermal spray
Prior art date
Application number
PCT/JP2015/076506
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English (en)
Japanese (ja)
Inventor
中井　毅
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日本精工株式会社
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Filing date
Publication date
Priority claimed from JP2015075200A external-priority patent/JP2015212576A/ja
Application filed by 日本精工株式会社 filed Critical 日本精工株式会社
Publication of WO2016157572A1 publication Critical patent/WO2016157572A1/fr

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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
    • F16C33/62—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
    • 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
    • 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

Definitions

  • the present invention relates to an insulating rolling bearing for electrolytic corrosion prevention in which a ceramic insulating layer is formed and a method for manufacturing the same.
  • an insulating rolling for preventing electric corrosion is formed by forming an insulating layer on the outer peripheral surface of the outer ring excluding the outer ring raceway constituting the rolling bearing so that no current flows through the bearing. Bearings are used.
  • a resin layer is also formed as an insulating layer, but it is formed by spraying ceramics from the viewpoint of insulation performance, durability, etc., and droplets of the ceramic material are sprayed from the spray nozzle to a surface other than the raceway surface, that is, Insulating layers having a predetermined thickness are formed by spraying on the outer peripheral surface and both end surfaces of the outer ring and the inner peripheral surface and both end surfaces of the inner ring (see, for example, Patent Documents 1 to 3).
  • the insulation structure can be maintained by impregnating the pores with a sealing agent such as synthetic resin after thermal spraying, curing the synthetic resin and performing sealing treatment. It has been broken.
  • the sealing agent cannot be infiltrated into all the voids, and the insulation resistance value and the breakdown voltage are reduced. Decrease significantly. Further, since the sealing agent also has a function of maintaining the toughness and adhesion of the insulating layer, the strength of the insulating layer and the adhesion with the base material are reduced unless the sealing agent penetrates sufficiently. In addition, cracks may develop starting from a portion having a high porosity. And depending on these causes, peeling may occur in some cases.
  • the insulating coating is made of a mixture of different types of ceramics.
  • different types of ceramic powders are mixed at a predetermined ratio and melted in an electric furnace, cooled and solidified to form an ingot, and the ingot is pulverized.
  • a thermal spray material classified into a predetermined particle size is used.
  • the different components are not uniformly dispersed, and some of the components exist as they are (see FIG. 3).
  • spraying using such a thermal spray material In the obtained sprayed coating, a large number of coarse lumps are dispersed, and a structure in which different components are separated from each other is formed, so that sufficient film strength and film characteristics may not be obtained.
  • an object of the present invention is to form an insulating film having an insulating property and a coating strength that are superior to those of conventional ones and in which there are few variations in an insulating rolling bearing for preventing electrolytic corrosion formed with a ceramic insulating layer.
  • the present invention provides the following insulating rolling bearing for preventing electric corrosion and a method for manufacturing the same.
  • a metal outer ring having an outer ring raceway formed on the inner peripheral surface, a metal inner ring disposed inside the outer ring and having an inner ring raceway formed on the outer peripheral surface, and between the outer ring raceway and the inner ring raceway.
  • Insulating rolling bearing for preventing electric corrosion comprising a plurality of rolling elements each made of metal and capable of rolling, wherein an insulating film is formed on at least one of the outer ring, the inner ring and the rolling elements.
  • the insulating coating contains alumina and zirconia as main components, and zirconia is 5% by mass or more and 40% by mass or less based on the total amount of alumina and zirconia, and the alumina contains ⁇ -alumina and ⁇ -alumina.
  • the zirconia contains at least one of monoclinic zirconia and cubic zirconia.
  • Insulating rolling bearing for preventing electric corrosion comprising a plurality of rolling elements each made of metal and capable of rolling, wherein an insulating film is formed on at least one of the outer ring, the inner ring and the rolling elements.
  • Alumina powder and zirconia powder are used as a raw material powder of a thermal spray material, and a thermal spray coating is formed by spraying a thermal spray material having a zirconia content of 5 mass% to 40 mass% of the total amount of the thermal spray material.
  • a method of manufacturing an insulating rolling bearing for preventing electrical corrosion comprising a plurality of rolling elements each made of metal and capable of rolling, wherein an insulating film is formed on at least one of the outer ring, the inner ring and the rolling elements.
  • the insulating coating formed in the present invention is a sprayed coating in which at least one of cubic zirconia and monoclinic zirconia is mixed in at least one of ⁇ -alumina and ⁇ -alumina, and has excellent insulating performance and variation. It is dense and excellent in film strength. Therefore, it is possible to obtain an insulating rolling bearing for preventing corrosion, which can maintain excellent insulating performance for a long time and has excellent durability.
  • the other component is infused into a lump of one component. It becomes an insulating film in which fine particles are dispersed. Therefore, this insulating film has no coarse particles, has a uniform structure, and is excellent in film strength and film characteristics.
  • FIG. 10 is a graph showing the results of Test 6.
  • 10 is a graph showing the results of Test 7. It is a X-ray-diffraction data of a thermal spray material and an insulating film. It is the electron micrograph which image
  • FIG. 10 is a graph showing the results of Test 8. It is a graph which shows the measurement result of the fracture toughness value of each thermal spray coating of Example 5 and Comparative Example 7 obtained in Test 9. It is a graph which shows the measurement result of the breakdown voltage value of each thermal spray coating of Example 5 and Comparative Example 7 obtained in Test 9. It is the electron micrograph which image
  • the structure of the electric rolling prevention insulating rolling bearing is not limited.
  • the electric rolling prevention insulating rolling bearing shown in FIG. 1 can be exemplified.
  • a plurality of rolling elements 5 are provided between the inner ring raceway 2 formed on the outer peripheral surface of the inner ring 1 and the outer ring raceway 4 formed on the inner peripheral surface of the outer ring 3,
  • An insulating coating 6 is formed on at least the outer peripheral surface of the outer ring 3 on the surface excluding the outer ring raceway surface.
  • a surface of the outer ring 3 other than the surface on which the outer ring raceway surface 4 is formed that is, the outer peripheral surface 7 of the outer ring 3, both axial end surfaces 8 and 8, and the outer peripheral surface 7 and both end surfaces 8 and 8 are continuous.
  • An insulating film 6 is formed over the curved portions 9 and 9.
  • the insulating coating 6 insulates the outer ring 3 from the housing when the outer ring 3 is fitted and supported in a metal housing. As a result, no current flows between the outer ring 3 and the housing, and no electrolytic corrosion occurs on other bearing components.
  • the insulating coating 6 is mainly composed of alumina and zirconia, and zirconia is 5% by mass or more and 40% by mass or less based on the total amount of alumina and zirconia. By setting the zirconia content within this range, the dense insulating coating 6 can be obtained at low cost.
  • the insulating coating 6 has the above composition, but structurally, at least one of cubic zirconia and monoclinic zirconia is mixed in ⁇ -alumina and ⁇ -alumina, and ⁇ -alumina and ⁇ -alumina are mixed. In addition, a mixture of both cubic zirconia and monoclinic zirconia is preferable.
  • a thermal spray material made of alumina containing zirconia is sprayed.
  • the thermal spray coating obtained by thermal spraying becomes the insulating coating 6.
  • ⁇ -alumina is formed in ⁇ -alumina, and monoclinic zirconia and cubic zirconia are mixed there.
  • unmelted ⁇ -alumina particles are reduced and fine ⁇ -alumina is formed, thereby reducing coarse pores along the boundary of unmelted ⁇ -alumina particles and improving film strength. .
  • the insulating coating 6 preferably includes both cubic zirconia and monoclinic zirconia in both ⁇ -alumina and ⁇ -alumina.
  • the alumina in the thermal spray material is high purity, Na 2 O 3 contained as impurities is 0.5 mass% or less, and Fe 2 O 3 is 0%. It is preferable to use high-purity alumina of 1% by mass or less. By using high-purity alumina, the wettability between particles is improved, and densification is further promoted during thermal spraying. As a result, the adhesion between the insulating coating 6 and the base metal is increased, and the insulating performance is improved. Will also be better. Most preferably, the alumina purity is 100%, that is, pure alumina. As the purity of alumina decreases, voids tend to increase.
  • alumina powder preferably high-purity alumina
  • zirconia powder produced by the Bayer method or the like are melted in an oxygen stream in an arc furnace, which is an electric furnace at 1500 ° C. or higher, and cooled. It is preferable to use an ingot obtained by pulverization and sizing. A dense thermal spray material can be obtained by such a manufacturing method. Further, the fineness of the insulating coating 6 is further improved by sizing so as to have an average distribution of 10 to 70 ⁇ m, preferably 20 to 40 ⁇ m.
  • the zirconia powder blended at the above ratio and the alumina powder are mixed while being pulverized, and the obtained mixed powder is dissolved in an electric furnace, cooled and solidified into an ingot, It is preferable to pulverize the ingot and classify it to the above particle size.
  • a mixing device for mixing while pulverizing a mixer filled with pulverizing media, for example, a bead mill, a ball mill, an attritor or the like can be used.
  • thermal spraying such a thermal spray material improves the fluidity of the powder, prevents the particles from being broken, and allows thermal spraying without entraining atmospheric oxygen in the thermal spray coating.
  • the number of vacancies is greatly reduced and becomes denser.
  • the insulating performance of the insulating coating 6 is improved and the quality is stabilized.
  • the thickness of the insulating coating 6 is not limited, and is about 100 to 500 ⁇ m as in the conventional case.
  • thermal spraying is performed so that the porosity of the obtained thermal spray coating is 2% or more and 10% or less.
  • the porosity is in the range of 2% or more and 10% or less, the strength is high, the strength is not greatly different, and the variation is small.
  • the porosity around 5% is preferable because of higher strength.
  • the porosity is less than 2% or exceeds 10%, the strength decreases and the variation in strength also increases. In general, it is considered that the smaller the porosity, the denser and higher the thermal spray coating is. However, the film strength is low even when the porosity is less than 2%, and the film strength decreases as it approaches 0%. It is impossible to think from conventional knowledge.
  • the porosity can be controlled by the thermal spraying conditions.
  • the thermal spraying conditions are determined in advance by preliminary experiments so that the porosity is 2% or more and 10% or less, preferably around 5%. ).
  • the porosity can be controlled to 2% or more and 10% or less by plasma spraying in the atmosphere.
  • a sealing treatment may be performed in the same manner as in the past.
  • the insulating coating 6 by thermal spraying is dense and has fewer pores than before, so that the pores can be reliably filled by this sealing treatment, and excellent insulation performance is ensured. Can do.
  • an organic sealing agent containing an acrylic resin, an epoxy resin, a fluororesin, a phenol resin, a polyester resin, or a resin in which these are combined (ester-based, acrylic-based, epoxy-based, Methacrylate type, silicone type and polyester type) are preferred.
  • Test 1 On the outer peripheral surface of the outer ring constituting the single row deep groove type ball bearing of the identification number “6316” (outer diameter: 170 mm, inner diameter: 80 mm, width: 39 mm), the alumina purity is different as shown in Table 1, and zirconia is 20 A thermal spray material (average particle size: 25 ⁇ m) containing alumina is formed by plasma spraying, and then the spray coating is subjected to sealing treatment to prepare a test specimen. For comparison, a test specimen was prepared using an alumina-1% titania commercial thermal spray material as the thermal spray material. Moreover, as shown in FIG.
  • the test body before sealing treatment was cut
  • the porosity was determined by the procedure. (1) Using a digital microscope, capture a cross-sectional image of the test piece into a personal computer. (2) The captured image is binarized with an appropriate threshold (converted into two colors of black and white). (3) The area of the black part is counted as a pore, and the porosity is calculated from “black part area / measurement range area”. (4) This work is performed at 12 locations per test piece, and the average value is calculated.
  • the porosity is as low as 2% or less, and the purity of alumina is low It can be seen that the lower the porosity, the higher the porosity. Moreover, it turns out that the sprayed coating of an Example is dense also compared with a commercially available spraying material.
  • Test 2 The thermal spray material used in Test 1 was sprayed onto the SUJ2 block as the outer ring material, and the adhesion of the thermal spray coating was measured.
  • the method for measuring the adhesion force is shown in FIG. 6. After using a pair of SUJ2 blocks (base materials) on which a thermal spray coating is formed, the thermal spray coatings are bonded to each other with an epoxy adhesive and then pulled in opposite directions to form a thermal spray coating. The tensile force peeled from the base material was measured.
  • Test 3 The insulation resistance value of the outer ring of the test bearing produced in Test 1 was measured.
  • Fig. 8 shows how to measure the insulation resistance value.
  • An annular jig is attached to the outer circumference of the outer ring of the test bearing with tightening bolts, and the line of the insulation resistance measuring machine is connected to the inner diameter of the outer ring collar and the jig. The insulation resistance value was measured.
  • a ground wire was connected to the jig.
  • Test 4 The fracture toughness value of the specimen prepared in Test 1 was measured according to the IF method described in JIS R 1607-1990. The results are shown in FIG. 10, and it can be seen that the fracture toughness value is high by using high-purity alumina powder as in the Examples, and the fracture toughness value decreases as the purity of alumina decreases. Moreover, even if it compares with a commercially available spray material, it turns out that the thermal spray coating of an Example has a high fracture toughness value.
  • Test 5 As shown in Table 2, the zirconia content is different on the outer peripheral surface of the outer ring constituting the single row deep groove type ball bearing (outer diameter: 170 mm, inner diameter: 80 mm, width: 39 mm) of the identification number “6316”, and the remainder is A thermal spray material (Na 2 O 3 in alumina: 0.5 mass%, Fe 2 O 3 : 0.1 mass%, average particle size: 25 ⁇ m), which is alumina, is plasma sprayed, and then subjected to a sealing treatment and tested. The body was made. For comparison, a test specimen was prepared using an alumina-1% titania commercial thermal spray material as the thermal spray material. And the porosity of the sprayed coating was measured in the same manner as in Test 1.
  • Test 6 About the test body produced in Test 5, the adhesion of the sprayed coating was measured in the same manner as in Test 2. The results are shown in FIG. 12, which shows a good correlation with the porosity of Test 5, and the adhesion strength decreases as the porosity of the sprayed coating increases.
  • Test 7 The insulation resistance value of the test body prepared in Test 5 was measured in the same manner as in Test 3. The results are shown in FIG. 13, and the insulation resistance value is high when the zirconia content is in the range of 5 to 40% by mass as in the example, and the thermal spray coating of the example has an insulation resistance value even compared to the commercially available thermal spray material. Is high.
  • the thermal spray raw material used in Example 1 and the obtained thermal spray coating were analyzed by X-ray diffraction.
  • the X-ray diffraction pattern is shown in FIG. 14, where the horizontal axis indicates the diffraction angle (2 ⁇ ) and the vertical axis indicates the diffraction intensity.
  • the thermal spray material consists of ⁇ -alumina and monoclinic zirconia.
  • ⁇ -alumina and cubic zirconia are produced in the sprayed coating, and ⁇ -alumina and single crystal zirconia are formed. Mixed with oblique crystal-zirconia. It can also be seen from the diffraction intensity on the vertical axis that ⁇ -alumina decreases as ⁇ -alumina (portion enclosed by an ellipse) is generated.
  • FIG. 15 shows an electron micrograph of the thermal spray material used in Example 1 and the appearance of a commercially available thermal spray material. It can be seen that the thermal spray material of Example 1 is denser.
  • Test 8 The thermal spray material containing 20% zirconia and the balance being alumina is applied to the outer peripheral surface and both end surfaces of the outer ring constituting the single row deep groove ball bearing (outer diameter: 170 mm, inner diameter: 80 mm, width: 39 mm) of nominal number 6316. Then, plasma spraying was performed under different spraying conditions (see FIG. 1) to form films with different porosity. The film thickness of each film was fixed to 200 ⁇ m by processing and polishing. After thermal spraying, the porosity was determined in the same manner as in Test 1 above.
  • a sealing agent containing an acrylic resin was applied to the coating, dried and subjected to sealing treatment to obtain a test body, and the fracture toughness value of the coating was measured to examine the relationship with the porosity. Fracture toughness values were measured at five locations on the coating for each specimen.
  • the porosity when the porosity is less than 2% or exceeds 10%, the strength is lower than the porosity of 2% or more and 10% or less, and as the porosity approaches 0%, or the porosity The greater the rate, the greater the decrease in strength. Moreover, the difference between the minimum value and the maximum value is large, and the variation is large.
  • Example 5 is about twice as high as the thermal spray coating of Comparative Example 7.
  • an insulating coating is formed only on the outer ring of the bearing.
  • a similar insulating coating may be formed on the inner ring or the rolling element, and all of the outer ring, the inner ring and the rolling element may be formed.
  • An insulating film may be formed.
  • the insulating rolling bearing for preventing electric corrosion of the present invention is excellent in film strength and insulating properties of the insulating coating, it is useful as a bearing for supporting a rotating shaft of an electric motor, a generator or the like.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

L'invention concerne un roulement à rouleaux doté d'une isolation pour la prévention de la corrosion électrolytique dans lequel au moins l'un parmi les éléments roulants, un chemin de roulement extérieur, et un chemin de roulement intérieur qui sont en métal est revêtu d'un film de revêtement isolant contenant de l'alumine et de la zircone en tant que composants principaux, la zircone se trouvant dans la plage de 5 à 40 % en masse par rapport à la quantité totale d'alumine et de zircone, l'alumine contenant de l'α-alumine et de la γ-alumine, et la zircone contenant de la zircone monoclinique et/ou de la zircone cubique.
PCT/JP2015/076506 2015-04-01 2015-09-17 Roulement à rouleaux doté d'une isolation pour la prévention de la corrosion électrolytique, et son procédé de fabrication WO2016157572A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-075200 2015-04-01
JP2015075200A JP2015212576A (ja) 2014-04-16 2015-04-01 電食防止用絶縁転がり軸受及びその製造方法

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112553558A (zh) * 2020-11-20 2021-03-26 中机凯博表面技术江苏有限公司 轴承表面绝缘涂层的制备方法
CN115142005A (zh) * 2021-04-15 2022-10-04 浙江福腾宝家居用品有限公司 烹饪器具及其制备方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006291350A (ja) * 2005-04-07 2006-10-26 Sulzer Metco Ag 熱被覆する材料及び方法、表面層並びにその材料の表面層を備える圧縮機
JP2007198519A (ja) * 2006-01-27 2007-08-09 Nsk Ltd 電食防止用絶縁転がり軸受
JP2008082413A (ja) * 2006-09-27 2008-04-10 Ntn Corp 絶縁転がり軸受
JP2014190393A (ja) * 2013-03-27 2014-10-06 Nsk Ltd 転動体

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006291350A (ja) * 2005-04-07 2006-10-26 Sulzer Metco Ag 熱被覆する材料及び方法、表面層並びにその材料の表面層を備える圧縮機
JP2007198519A (ja) * 2006-01-27 2007-08-09 Nsk Ltd 電食防止用絶縁転がり軸受
JP2008082413A (ja) * 2006-09-27 2008-04-10 Ntn Corp 絶縁転がり軸受
JP2014190393A (ja) * 2013-03-27 2014-10-06 Nsk Ltd 転動体

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112553558A (zh) * 2020-11-20 2021-03-26 中机凯博表面技术江苏有限公司 轴承表面绝缘涂层的制备方法
CN115142005A (zh) * 2021-04-15 2022-10-04 浙江福腾宝家居用品有限公司 烹饪器具及其制备方法

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