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WO2013122100A1 - Pièce de contact de roulement, palier de roulement, joint universel et leur procédé de fabrication - Google Patents

Pièce de contact de roulement, palier de roulement, joint universel et leur procédé de fabrication Download PDF

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Publication number
WO2013122100A1
WO2013122100A1 PCT/JP2013/053386 JP2013053386W WO2013122100A1 WO 2013122100 A1 WO2013122100 A1 WO 2013122100A1 JP 2013053386 W JP2013053386 W JP 2013053386W WO 2013122100 A1 WO2013122100 A1 WO 2013122100A1
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WO
WIPO (PCT)
Prior art keywords
rolling
mass
rolling contact
universal joint
ball
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2013/053386
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English (en)
Japanese (ja)
Inventor
前田　喜久男
雅之 川北
久保田　学
小澤　修司
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTN Corp
Nippon Steel Corp
Original Assignee
NTN Corp
Nippon Steel and Sumitomo Metal Corp
NTN Toyo Bearing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NTN Corp, Nippon Steel and Sumitomo Metal Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Publication of WO2013122100A1 publication Critical patent/WO2013122100A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces
    • 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
    • F16C33/32—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
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • 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
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/60—Ferrous alloys, e.g. steel alloys
    • F16C2204/62—Low carbon steel, i.e. carbon content below 0.4 wt%
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2300/00—Special features for couplings or clutches
    • F16D2300/10—Surface characteristics; Details related to material surfaces

Definitions

  • the present invention relates to a rolling contact part, a rolling bearing, a universal joint, and a manufacturing method thereof, and more specifically, a rolling having characteristics equivalent to or higher than those using JIS standard SCM420 as a material while adopting a material not containing molybdenum.
  • the present invention relates to contact parts, rolling bearings, universal joints, and methods for manufacturing them.
  • Rolling contact parts that constitute mechanical elements that operate while rolling contact with each other may be manufactured by performing carburizing or carbonitriding on formed steel.
  • chrome steel JIS standard SCr steel
  • chromium molybdenum steel JIS standard SCM steel
  • nickel chrome molybdenum steel JIS standard SNCM steel
  • etc. are rolling contact parts based on carburizing or carbonitriding. Adopted as a material.
  • the contents of Cr (chromium), Mo (molybdenum), and Ni (nickel), which are main alloy elements are different. Therefore, when these materials are employed, parts having different hardness distributions are obtained as a result of quench hardening performed after carburizing or carbonitriding.
  • JIS standard SCM420 is a typical steel adopted for medium size rolling bearings.
  • Medium size rolling bearings and the like are used in, for example, industrial machines and automobiles.
  • the present invention has been made in order to address the above-mentioned problems.
  • the purpose of the present invention is to provide a rolling contact part having a property equal to or higher than that using JIS standard SCM420 as a material while adopting a material not containing molybdenum. It is to provide a bearing and a universal joint.
  • the rolling contact component according to the present invention comprises 0.15 mass% or more and 0.25 mass% or less of carbon, 0.45 mass% or more and 0.55 mass% or less of silicon, 1.05 mass% or more of 1.
  • Rolling contact that contains 15% by mass or less of manganese and 1.40% by mass or more and 1.50% by mass or less of chromium, and is composed of the balance iron and impurities, and should be in rolling contact with other members on the surface.
  • the carburized layer or the carbonitrided layer is formed so as to include a rolling contact portion.
  • the present inventor examined the component composition of steel that can achieve the characteristics of rolling contact parts comparable to those using SCM420 as a material while adopting a material not containing Mo. As a result, it is clear that by adopting the above component composition and performing the same carburizing treatment or carbonitriding treatment as in the past, it is possible to give the rolling contact parts characteristics equal to or better than those using SCM420 as a raw material. I came up with it. According to the rolling contact component of the present invention, it is possible to provide a rolling contact component having characteristics equal to or better than those using JIS standard SCM420 as a material while adopting a material to which Mo is not added. The said component composition was determined based on the following thoughts.
  • Mo improves the hardenability of steel. Moreover, wear resistance is improved by forming carbide. Furthermore, temper softening resistance is improved by dissolving in martensite, and rolling fatigue life is improved by suppressing the occurrence of structural changes. Such an excellent effect lost by not adding Mo was supplemented by adjusting the addition amount of other elements as follows.
  • Si Silicon
  • Si has the effect of increasing the resistance to temper softening and improving the rolling fatigue life. Increasing the Si content over SCM420 compensated for these characteristics degradation due to the absence of Mo. On the other hand, if the amount of Si added is too large, the cold workability of the material decreases. In addition, grain boundary oxidation is promoted during carburizing or carbonitriding. Considering these points and the relationship with the addition amounts of manganese and chromium described later, the median was determined to be 0.5% by mass. And the tolerance of the dispersion
  • Manganese (Mn) improves the hardenability of steel. Mn also improves the rolling fatigue life by increasing the amount of retained austenite after quench hardening. Increasing the Mn content over SCM420 compensated for these characteristics degradation due to the absence of Mo. On the other hand, if the amount of Mn added is too large, the toughness decreases. In addition, the cold workability of the material is reduced. Considering these points and the relationship with the addition amounts of silicon and chromium, the median value was determined to be 1.1% by mass. And the tolerance of the dispersion
  • Chromium (Cr) improves wear resistance by forming carbides. Cr also contributes to improving hardenability. Increasing the Cr content over SCM420 compensated for these characteristics degradation due to the absence of Mo. On the other hand, if the amount of Cr added is too large, excess carbides are formed and workability is reduced. Considering these points and the relationship with the addition amounts of silicon and manganese, the median was determined to be 1.45% by mass. And the tolerance of the dispersion
  • Al (aluminum) and Ti (titanium) may be added from the viewpoint of refining crystal grains.
  • these elements form non-metallic inclusions such as TiN and Ai 2 O 3 that lower the rolling fatigue life, it is preferable to reduce them as much as possible in the present invention.
  • the rolling contact part may be used as a rolling bearing part.
  • the rolling contact component of the present invention having characteristics equivalent to or better than those using SCM420 as a material is suitable as a rolling bearing component such as a race member (ring race) and a rolling element.
  • the rolling contact part may be used as a universal joint part.
  • the rolling contact component of the present invention having characteristics equivalent to or better than those made of SCM420 is suitable as a universal joint component such as a race member (inner race, outer race) and a torque transmission member (ball, roller).
  • the rolling bearing according to the present invention includes a race member and a plurality of rolling elements that are in contact with the race member and arranged on an annular raceway. At least one of the race member and the rolling element is the rolling contact component of the present invention.
  • a universal joint according to the present invention includes a raceway member connected to a first shaft member, a torque transmission member that is in contact with the raceway member and arranged to roll and slide on the surface of the raceway member, and a torque And a second shaft member connected to the first shaft member via the transmission member and the raceway member, and the rotation about the shaft transmitted to one of the first shaft member or the second shaft member is the first shaft member. It is a universal joint transmitted to the other of one shaft member or the second shaft member.
  • at least one of the race member and the torque transmission member is the rolling contact component of the present invention.
  • the method of manufacturing a rolling contact component according to the present invention includes 0.15% by mass to 0.25% by mass carbon, 0.45% by mass to 0.55% by mass silicon, and 1.05% by mass.
  • Rolling contact that contains not less than 1.15% by mass of manganese and 1.40% by mass to not more than 1.50% by mass of chromium, and is made of steel consisting of the remaining iron and impurities, and should be in rolling contact with other members.
  • the rolling contact component of the said invention can be manufactured.
  • a molded member molded into the shape of a rolling bearing part in the step of preparing a molded member, a molded member molded into the shape of a rolling bearing part may be prepared. Thereby, the rolling contact component which can be used as a component of a rolling bearing can be manufactured.
  • a molded member molded into the shape of a universal joint part in the step of preparing a molded member, a molded member molded into the shape of a universal joint part may be prepared. Thereby, the rolling contact component which can be used as a component of a universal joint can be manufactured.
  • the method for manufacturing a rolling bearing according to the present invention includes a step of preparing a race member, a step of preparing a rolling element, and a step of assembling the rolling bearing by combining the race member and the rolling element. And at least any one of a track member and a rolling element is manufactured with the manufacturing method of the rolling contact components of the said this invention. Thereby, the rolling bearing of the present invention can be manufactured.
  • the method for manufacturing a universal joint according to the present invention includes a step of preparing a race member, a step of preparing a torque transmission member, and a step of assembling a universal joint by combining the race member and the torque transmission member. And at least any one of a track member and a torque transmission member is manufactured with the manufacturing method of the rolling contact components of the said this invention. Thereby, the universal joint of the present invention can be manufactured.
  • the rolling contact part, the rolling bearing and the manufacturing method thereof of the present invention the characteristics equal to or higher than those using JIS standard SCM420 as the material while adopting the material not containing molybdenum are used. It is possible to provide a rolling contact part and a rolling bearing.
  • FIG. 4 is a schematic sectional view taken along line IV-IV in FIG. 3.
  • FIG. 4 is a schematic cross-sectional view showing a state in which the fixed joint of FIG. 3 forms an angle.
  • FIG. 4 is a schematic partial cross-sectional view showing an enlarged main part of FIG. 3.
  • FIG. 5 is a schematic partial cross-sectional view showing an enlarged main part of FIG. 4. It is the schematic which shows a heat processing pattern.
  • a deep groove ball bearing 1 is arranged between an annular outer ring 11, an annular inner ring 12 disposed inside the outer ring 11, and between the outer ring 11 and the inner ring 12. 14 and a plurality of balls 13 as rolling elements held by 14.
  • An outer ring rolling surface 11 ⁇ / b> A is formed on the inner circumferential surface of the outer ring 11, and an inner ring rolling surface 12 ⁇ / b> A is formed on the outer circumferential surface of the inner ring 12.
  • wheel 12 are arrange
  • the plurality of balls 13 are in contact with the inner ring rolling surface 12A and the outer ring rolling surface 11A on the ball contact surface 13A that is the surface thereof, and are arranged at a predetermined pitch in the circumferential direction by the cage 14, It is rotatably held on an annular track.
  • the outer ring 11 and the inner ring 12 of the deep groove ball bearing 1 are rotatable relative to each other.
  • the outer ring 11, the inner ring 12 and the ball 13 are rolling contact parts having an outer ring rolling surface 11A, an inner ring rolling surface 12A and a ball contact surface 13A as rolling contact portions, respectively.
  • the outer ring 11, the inner ring 12 and the ball 13 which are rolling contact parts are 0.15 mass% or more and 0.25 mass% or less of carbon, 0.45 mass% or more and 0.55 mass% or less of silicon, It contains 1.05 mass% or more and 1.15 mass% or less of manganese and 1.40 mass% or more and 1.50 mass% or less of chromium, and is made of steel composed of the balance iron and impurities.
  • the outer ring carburizing layer which is a carburized layer having a higher carbon concentration than the inside 11C, 12C, and 13C, is included in the region including the outer ring rolling surface 11A, the inner ring rolling surface 12A, and the ball contact surface 13A.
  • Layer 11B, inner ring carburized layer 12B, and ball carburized layer 13B are formed.
  • the impurities include inevitable impurities such as those derived from steel raw materials or those mixed in the manufacturing process.
  • the outer ring carburized layer 11B, the inner ring carburized layer 12B, and the ball carburized layer 13B may be carbonitrided layers having a higher carbon concentration and nitrogen concentration than the inner portions 11C, 12C, and 13C, respectively.
  • the outer ring 11, the inner ring 12 and the ball 13 are made of steel to which Mo is not added, and which can be deteriorated by the addition of Mo and supplemented by adjusting the addition amounts of Si, Mn and Cr, and the outer ring rolling surface 11A, It is a rolling contact component in which a carburized layer or a carbonitrided layer is formed in a region including the inner ring rolling surface 12A and the ball contact surface 13A. Therefore, the outer ring 11, the inner ring 12 and the ball 13 in the present embodiment are rolling contact parts having characteristics comparable to those using SCM420 as a material while adopting a material not added with Mo. Thus, by adopting steel to which Mo is not added as a material, stable acquisition of the material and reduction of material cost can be achieved.
  • a molded member that is made of steel containing iron and impurities, and containing the outer ring 11, the inner ring 12 and the ball 13 is produced, which contains chromium of 1.40% by mass to 1.50% by mass.
  • a steel member having the above component composition is prepared, and by performing processing such as forging and cutting, formed members formed into the shapes of the outer ring 11, the inner ring 12 and the balls 13 are produced.
  • carburizing or carbonitriding is performed on the obtained molded member.
  • the conditions for the carburizing process and the carbonitriding process can be the same as in the case of manufacturing bearing parts using SCM420 as a raw material.
  • Carburizing or carbonitriding treated molded member by being cooled from a temperature range of not lower than A 1 point to a temperature range below M S point, is quench-hardened. Thereafter, a tempering process for heating to a temperature range of A 1 point or less is performed.
  • the outer ring 11, the inner ring 12 and the ball 13 are completed by performing a finishing process such as a polishing process on the outer ring rolling surface 11A, the inner ring rolling surface 12A and the ball contact surface 13A.
  • the deep groove ball bearing 1 is assembled by combining the outer ring 11, the inner ring 12, the ball 13, a separately prepared cage 14, and the like.
  • FIG. 3 is a schematic cross-sectional view showing a configuration of a constant velocity joint (fixed joint) as a universal joint of the second embodiment which is another embodiment of the present invention.
  • FIG. 4 is a schematic sectional view taken along line IV-IV in FIG.
  • FIG. 5 is a schematic cross-sectional view showing a state where the fixed joint of FIG. 3 forms an angle.
  • FIG. 3 corresponds to a schematic cross-sectional view taken along line III-III in FIG.
  • FIG. 6 is a schematic partial cross-sectional view showing an enlarged main part of FIG.
  • FIG. 7 is a schematic partial cross-sectional view showing an enlarged main part of FIG.
  • a fixed joint as a universal joint according to Embodiment 2 of the present invention will be described with reference to FIGS.
  • the fixed joint 3 is disposed so as to surround an inner race 31 as a track member connected to a shaft 35 as a second shaft member, and an outer peripheral side of the inner race 31.
  • An outer race 32 as a track member connected to a shaft 36 as a first shaft member
  • a ball 33 as a torque transmission member disposed between the inner race 31 and the outer race 32
  • a ball 33 Holding cage 34.
  • the ball 33 includes an inner race ball groove 31 ⁇ / b> A formed on the outer peripheral surface of the inner race 31 and an outer race ball groove 32 ⁇ / b> A formed on the inner peripheral surface of the outer race 32. And is held by a cage 34 so as not to fall off.
  • the inner race ball groove 31A and the outer race ball groove 32A formed on the outer peripheral surface of the inner race 31 and the inner peripheral surface of the outer race 32 pass through the centers of the shaft 35 and the shaft 36, respectively.
  • each of them is formed in a curve (arc) shape having a curvature center at points A and B that are equidistant from the joint center O on the axis to the left and right on the axis. That is, the trajectory of the center P of the ball 33 that rolls in contact with the inner race ball groove 31A and the outer race ball groove 32A is centered on the point A (inner race center A) and point B (outer race center B).
  • Each of the inner race ball groove 31A and the outer race ball groove 32A is formed so as to have a curved line (arc). Thereby, even when the fixed joint makes an angle (when the fixed joint operates so that the axes passing through the centers of the shaft 35 and the shaft 36 intersect), the ball 33 always keeps the center of the shaft 35 and the shaft 36 at the center. Located on the bisector of the angle ( ⁇ AOB) formed by the passing axis.
  • the ball 33 includes the inner race ball groove 31 ⁇ / b> A and the outer race ball having the centers of curvature at the inner race center A and the outer race center B described above.
  • the center P is held at a position on the bisector of ⁇ AOB.
  • the inner race ball groove 31A and the outer race ball groove 32A are formed so that the distance from the joint center O to the inner race center A and the distance from the outer race center B are equal.
  • the distances from the center P to the inner race center A and the outer race center B are equal, and the triangle OAP and the triangle OBP are congruent.
  • the distances L from the center P of the ball 33 to the shafts 35 and 36 are equal to each other, and when one of the shafts 35 and 36 rotates around the axis, the other also rotates at a constant speed.
  • the fixed joint 3 can ensure constant velocity even when the shafts 35 and 36 form an angle.
  • the cage 34 together with the inner race ball groove 31A and the outer race ball groove 32A, prevents the balls 33 from jumping out from the inner race ball groove 31A and the outer race ball groove 32A when the shafts 35 and 36 rotate. It functions to determine the joint center O of the fixed joint 3.
  • the fixed joint 3 as a universal joint in the second embodiment is formed in the outer race 32 by contacting the outer race 32 as the race member connected to the shaft 36 as the first shaft member and the outer race 32.
  • a ball 33 as a torque transmitting member arranged so as to be able to roll and slide on the surface of the outer race ball groove 32A, and a second shaft member connected to the shaft 36 via the ball 33 and the outer race 32 As a shaft 35.
  • the fixed joint 3 is a universal joint in which the rotation around the shaft transmitted to one of the shaft 36 and the shaft 35 is transmitted to the other of the shaft 36 and the shaft 35.
  • the ball 33 is rolled between the outer race 32 as the race member connected to the shaft 36 as the first shaft member and the shaft 35 as the second shaft member in the fixed joint 3 which is a universal joint.
  • This is a torque transmission member for a universal joint that is interposed so as to be movable and slidable, and transmits the rotation around the shaft transmitted to one of the shafts 36 and 35 to the other of the shafts 36 and 35.
  • the inner race 31, outer race 32, and ball 33 which are rolling contact parts are 0.15 mass% or more and 0.25 mass% or less of carbon, and 0.45 mass. % Or more and 0.55% by mass or less of silicon, 1.05% by mass or more and 1.15% by mass or less of manganese, and 1.40% by mass or more and 1.50% by mass or less of chromium, and the balance iron and It consists of steel made of impurities.
  • regions including inner race ball groove 31A (groove surface), outer race ball groove 32A (groove surface) and ball rolling surface 33A have inner 31C, 32C and 33C, respectively.
  • An inner race carburized layer 31B, an outer race carburized layer 32B, and a ball carburized layer 33B, which are carburized layers having a higher carbon concentration, are formed.
  • the impurities include inevitable impurities such as those derived from steel raw materials or those mixed in the manufacturing process.
  • the inner race carburized layer 31B, the outer race carburized layer 32B, and the ball carburized layer 33B may be a carbonitrided layer having a higher carbon concentration and nitrogen concentration than the inner portions 31C, 32C, and 33C, respectively.
  • the inner race 31, the outer race 32, and the ball 33 are made of steel that is not added with Mo, and that has the characteristics that can be reduced by the addition of Mo and that is supplemented by adjusting the addition amounts of Si, Mn, and Cr.
  • This is a rolling contact part in which a carburized layer or a carbonitrided layer is formed in a region including 31A, the outer race ball groove 32A and the ball rolling surface 33A. Therefore, the inner race 31, the outer race 32, and the ball 33 in the present embodiment are rolling contact parts having characteristics comparable to those using the SCM 420 as a material while adopting a material not added with Mo.
  • Mo is not added as a material
  • the fixed joint 3 according to the present embodiment having the rolling contact component of the present invention having excellent peeling resistance and smearing resistance can be peeled or smeared when the ball 33 slides while rolling. Therefore, it is a universal joint with excellent durability.
  • the inner race 31, the outer race 32, the ball 33, and the fixed joint 3 including these can be manufactured by the same manufacturing method as the outer ring 11, the inner ring 12, the ball 13, and the deep groove ball bearing 1 including these. it can.
  • the rolling bearing of this invention is not restricted to this,
  • at least one of the inner ring 12 and the ball 13 may be the rolling contact component of the present invention.
  • a deep groove ball bearing that is a radial ball bearing has been described as an example of the rolling bearing of the present invention.
  • the rolling bearing of the present invention is not limited to this and may be a radial roller bearing.
  • a thrust roller bearing or a thrust ball bearing may be used.
  • the fixed joint in which the inner race 31, the outer race 32, and the ball 33 are all rolling contact parts of the present invention has been described.
  • the universal joint of the present invention is not limited to this, and the inner race At least any one of the outer race 32 and the ball 33 may be the rolling contact component of the present invention.
  • the fixed joint has been described as an example of the universal joint of the present invention.
  • the universal joint of the present invention is not limited to this, and other types of universal joints may be used.
  • Example 1 a steel material that satisfies the range of the component composition of steel constituting the rolling contact part of the present invention was prepared (Example).
  • Example 2 a steel material of JIS standard SCM420 was also prepared for comparison (comparative example).
  • the specific component composition of the material is shown in Table 1.
  • Table 1 the Mo content in the examples is the level of impurities and is indicated by “ ⁇ ”.
  • test piece was produced using the steel materials of the above Examples and Comparative Examples, and the following experiment was conducted.
  • Heat treatment characteristic test A test piece having a diameter of 12 mm and a length of 22 mm [using the rolling life test piece of (2)] was produced from the steel material. And the heat processing which implements a carburizing process, a quench hardening process, and a tempering process in order to the said test piece was performed. And the surface hardness (edge surface hardness) of the test piece which completed heat processing, the hardness distribution in a cross section, and the amount of retained austenite in the surface were measured.
  • the heat treatment for the test piece was performed based on the heat treatment pattern shown in FIG.
  • the horizontal direction indicates time, and the time elapses toward the right.
  • the vertical direction indicates the temperature, and the higher the temperature, the higher the temperature.
  • the temperature in the furnace in which the test piece was charged was raised to temperature T 1 (950 ° C.), and R gas was supplied at a flow rate of 10.0 m 3 / h.
  • the carbon potential in the furnace was CP 1 (1.2%). This state was maintained for a time t 1 (330 minutes).
  • the carbon potential in the furnace was lowered to CP 2 (1.1%), and this state was maintained for a time t 2 (150 minutes).
  • the temperature in the furnace was lowered to T 2 (850 ° C.) and the carbon potential was lowered to CP 3 (0.8%), and this state was maintained for a time t 3 (30 minutes).
  • the point contact rolling life tester 2 includes a drive roller 22, a guide roller 23, and a steel ball 24.
  • the test piece 21 is driven by the drive roller 22 and rotates in contact with the steel ball 24.
  • the steel ball 24 is guided by the guide roller 23 and rolls while exerting a high surface pressure with the test piece 21.
  • the point contact rolling life test machine 2 was operated as described above, and the number of loads (life) until the test piece 21 peeled was investigated. Table 2 shows the test conditions.
  • Abrasion resistance test The test piece subjected to the heat treatment was subjected to an experiment for investigating the abrasion resistance using a Sabang-type abrasion tester.
  • the Saban-type wear tester 6 includes a load cell 63 and an air slider 64.
  • the flat plate-shaped wear test piece 61 is held by an air slider 64, and the load due to the weight 62 applied during the wear test is detected by the load cell 63. Then, the mirror-polished surface of the wear test piece 61 and the outer peripheral surface of the counterpart material 65 are brought into contact with each other, and the counterpart material 65 is rotated. Lubricating oil is not directly supplied to the contact surface between the wear test piece 61 and the mating member 65, and a part of the mating material 65 is immersed in the lubricating oil 66.
  • the Saban type wear tester 6 was operated, and the wear volume (wear amount) of the test piece after rotating the counterpart material for 60 minutes was measured. And the abrasion resistance of each test piece was evaluated by the reciprocal number of the said abrasion amount. Table 3 shows the test conditions.
  • the cylindrical rolling tester 5 is set with a disk-shaped mating test piece 51 so as to be rotatable around the first axis 53, and is rotatable around the second axis 54.
  • the disk-shaped test piece 52 is set.
  • the first shaft 53 and the second shaft 54 are arranged in parallel, and one of each of the first shaft 53 and the second shaft 54 so that the outer peripheral surface of the counterpart test piece 51 and the test piece 52 are in contact with each other.
  • a rotational speed meter 55 and a slip ring 56 are disposed at the other ends of the first shaft 53 and the second shaft 54.
  • Heat treatment characteristic test Table 6 shows the results of the hardenability test
  • Table 7 shows the other test results.
  • the cross-sectional hardness distribution of a test piece is shown in FIG.
  • both the L 10 life corresponding to the cumulative failure probability of 10% and the L 50 life corresponding to 50% have a life about twice that of the comparative example. From this, it can be said that the rolling contact part made of the steel of the example is superior to the rolling contact part made of the steel of the comparative example in the rolling fatigue life.
  • Table 9 shows the results of the Charpy impact test. For comparison, Table 9 also shows test results of JIS standard SCr420 and JIS standard SUJ2 performed under the same conditions.
  • the impact value of the example is about 75% of the impact value of SCM420. This is presumably because the steel of the example has a higher Si content than SCM420, and thus the thickness of the grain boundary oxide layer formed on the surface during the carburizing process is increased.
  • the impact value of SCr420 having a low internal hardness and SUJ2 having a high internal hardness than that of the example and SCM420 is generally adopted as a material for rolling contact parts.
  • SUJ2 which is much larger than the example and SCM420 and has a large internal hardness, is much smaller. As described above, the influence of internal hardness is extremely large on the Charpy impact value, and it is considered that the decrease in the impact value of the example with respect to the SCM 420 is not a problem in practical use.
  • the rolling contact component of the present invention has the same toughness as the rolling contact component made of SCM420.
  • Abrasion resistance test Table 11 shows the results of the abrasion resistance test.
  • the examples have wear resistance equal to or higher than that of the comparative example. From this, it can be said that the rolling contact part of the present invention has wear resistance equal to or higher than that of the rolling contact part made of SCM420.
  • the rolling contact component of the present invention is equivalent to the rolling contact component made of SCM420 and has sufficient cracking strength.
  • the examples have higher peeling resistance than the comparative examples. From this, it can be said that the rolling contact member of the present invention has high durability when used under the condition that the oil film is cut as compared with the conventional rolling contact component made of carburized SCM420. .
  • the speed ratio at which smearing occurs in the example is larger than that in the comparative example. From this, it can be said that the rolling contact member of the present invention has high durability when used under the condition of large slip as compared to the conventional rolling contact component made of carburized SCM420.
  • Table 15 summarizes the test results of rolling fatigue life (rolling life), impact value (impact strength), fracture toughness, wear resistance, crack strength, peeling resistance and smearing resistance. Show. In Table 15, the numerical value represents the ratio when the result of the comparative example (SCM420) is 1.
  • the steel of the example has heat treatment characteristics equivalent to those of SCM420. And as shown in Table 15, an Example exceeds a comparative example in the rolling life most important as rolling contact components. On the other hand, in the impact strength in a state where the surface is not polished or the like (black skin state), the example is slightly lower than the comparative example. However, it is difficult to consider the use conditions in which the rolling contact parts constituting the rolling bearing or the like receive an impact in a black skin state, and it is considered that no substantial problem occurs. From this, it can be said that the rolling contact component of the present invention that has been subjected to carburizing treatment has characteristics equal to or better than those using SCM420 as a material while adopting a material not containing Mo.
  • Table 15 shows the results when similar experiments were performed on the heat treatment of the above-described Examples and Comparative Examples changed from carburizing to carbonitriding.
  • the result in the case of carbonitriding is shown as a ratio where the result in the case of carbonitriding the SCM 420 is 1.
  • the improvement of the rolling life of the example was not less than SCM420, and the life difference from the comparative example was further widened.
  • about impact strength there was almost no difference between an Example and a comparative example. This is probably because the grain boundary oxide layer is less likely to be formed in the carbonitriding process than in the carburizing process.
  • the improvement in wear resistance of the example is not less than SCM420. From this, it can be said that the application of the carbonitriding process to the steel of the example has an effect more than in the case of SCM420.
  • the examples outperform the comparative examples. From this, it can be said that the rolling contact component of the present invention is particularly suitable for rolling bearings used for high-speed and low-load applications and components constituting a universal joint.
  • the rolling contact component, the rolling bearing, and the manufacturing method thereof according to the present invention can be applied particularly advantageously to the rolling contact component, the rolling bearing, and the manufacturing method thereof subjected to carburizing or carbonitriding.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)
  • Heat Treatment Of Articles (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
PCT/JP2013/053386 2012-02-16 2013-02-13 Pièce de contact de roulement, palier de roulement, joint universel et leur procédé de fabrication Ceased WO2013122100A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12331797B2 (en) 2020-05-26 2025-06-17 Aircraft Gear Corporation Method of carburizing driveline components

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CN105473715B (zh) 2013-08-09 2020-02-18 龟甲万株式会社 修饰型阿马多里酶及其制造法、以及阿马多里酶的耐表面活性剂性提高剂和使用它的HbA1c测定用组合物

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Publication number Priority date Publication date Assignee Title
JP2004027266A (ja) * 2002-06-24 2004-01-29 Daido Steel Co Ltd 焼入用鋼
JP2011063886A (ja) * 2010-11-05 2011-03-31 Nippon Steel Corp 低サイクル疲労特性に優れた浸炭焼入れ鋼材及び浸炭焼入れ部品
JP2012072462A (ja) * 2010-09-29 2012-04-12 Nippon Steel Corp 耐ピッチング性に優れた浸炭窒化鋼部品

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004027266A (ja) * 2002-06-24 2004-01-29 Daido Steel Co Ltd 焼入用鋼
JP2012072462A (ja) * 2010-09-29 2012-04-12 Nippon Steel Corp 耐ピッチング性に優れた浸炭窒化鋼部品
JP2011063886A (ja) * 2010-11-05 2011-03-31 Nippon Steel Corp 低サイクル疲労特性に優れた浸炭焼入れ鋼材及び浸炭焼入れ部品

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12331797B2 (en) 2020-05-26 2025-06-17 Aircraft Gear Corporation Method of carburizing driveline components

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