US20120210765A1 - Method for Manufacturing Mechanical Part Excellent in Rolling Fatigue Life - Google Patents

Method for Manufacturing Mechanical Part Excellent in Rolling Fatigue Life Download PDF

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Publication number
US20120210765A1
US20120210765A1 US13/390,793 US201013390793A US2012210765A1 US 20120210765 A1 US20120210765 A1 US 20120210765A1 US 201013390793 A US201013390793 A US 201013390793A US 2012210765 A1 US2012210765 A1 US 2012210765A1
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Prior art keywords
rolling
steel
annular
fatigue life
mechanical part
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Abandoned
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US13/390,793
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English (en)
Inventor
Toshihusa Nakamizo
Kazuya Hashimoto
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Sanyo Special Steel Co Ltd
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Sanyo Special Steel Co Ltd
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Assigned to SANYO SPECIAL STEEL CO., LTD. reassignment SANYO SPECIAL STEEL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HASHIMOTO, KAZUYA, NAKAMIZO, TOSHIHUSA
Publication of US20120210765A1 publication Critical patent/US20120210765A1/en
Abandoned legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/04—Making machine elements ball-races or sliding bearing races
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/16—Remodelling hollow bodies with respect to the shape of the cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K23/00—Making other articles
    • B21K23/04—Making other articles flanged articles
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C21D1/26—Methods of annealing
    • C21D1/32—Soft annealing, e.g. spheroidising
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • 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
    • 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
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • 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
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap

Definitions

  • the present invention relates to production of a mechanical part made of a steel material, such as a bearing, a gear, a hub unit, a variable speed transmission, a constant velocity joint or a piston pin, particularly to production of a mechanical part comprising an annular body for which a good rolling fatigue life is required.
  • Non-Patent Literature 1 and Non-Patent Literature 2 the process leading to a rolling fatigue failure, namely flaking, is explained as follows. That is, in the process that cracks originated from the non-metallic inclusion lead to the generation of flaking through their growth, there is involved a crack initiation stage (hereinafter, “Mode I-type initial crack”) in which the crack is displaced due to a stress concentration effect onto the periphery of the non-metallic inclusion. It is known that this then leads to failure through propagation of the crack by shear stress. This means that if a Mode I-type initial crack is not generated, subsequent crack propagation or failure does not occur. In addition, the Mode I-type initial crack occurs on the premise that there is generated a physical cavity, in an interface between the non-metallic inclusion and the matrix. It is also verified that unless the physical cavity is generated, the Mode I-type crack is not generated.
  • FIG. 5 is a conceptual diagram showing an image of the periphery of the non-metallic inclusion in a test piece which was cut out from a hot rolled steel material and then subjected to ion milling, when observed by a scanning electron microscope (FE-SEM) to confirm presence/absence of cavities therein.
  • FE-SEM scanning electron microscope
  • code 5 indicates a non-metallic inclusion of Al 2 O 3
  • code 4 indicates cavities. Particularly in machine structural steel, deoxidation by Al is normally performed. An Al 2 O 3 -based non-metallic inclusion 5 formed at this time is confirmed to tend to easily generate cavities 4 particularly in an interface with the matrix due to the difference in deformability from the matrix or due to the shape. Therefore, in order to improve the rolling fatigue life of the mechanical part 7 , it is effective to close the cavity 4 existing in the interface between the non-metallic inclusion 5 and the matrix or to reduce the volume of the cavity 4 .
  • the present invention is directed to a technology relating to (3) described in the above paragraph [0006] and is to provide a method for producing a mechanical part having a rolling portion superior in rolling fatigue life on the inner diameter surface of an annular workpiece material, by conducting plastic processing to improve the state of the interface between non-metallic inclusions and the matrix steel material contained in the steel material constituting the annular workpiece material, which is to be subjected to cold forging, as compared to the conventional method for producing the conventional steel material aiming at reducing the non-metallic inclusions and reducing the diameters of the non-metallic inclusions.
  • a method for producing a mechanical part superior in rolling fatigue life wherein the mechanical part comprises a rolling portion for a rolling element to roll along an inner diameter surface of an annular workpiece material subjected to cold forging, wherein the method comprises the step of performing cold forging by applying a hydrostatic stress to the inner diameter surface of the annular workpiece material on which the rolling portion is to be formed, thereby forming the rolling portion on the inner diameter surface of the annular workpiece material for the rolling element to roll therealong and increasing an inner diameter of the annular workpiece material other than the rolling portion, so as to provide an annular mechanical part comprising the rolling portion superior in rolling fatigue life.
  • the application of this hydrostatic pressure directs the cavities existing in the interface between non-metallic inclusions in the steel and the steel matrix to close, enabling production of a mechanical part superior in rolling fatigue life.
  • the annular workpiece material to be subjected to cold forging is preferably a steel pipe or a hot forged ring.
  • the hydrostatic stress is at least 1000 MPa.
  • Applying a hydrostatic stress of at least 1000 MPa during cold forging to form a rolling surface makes it possible to close the cavities existing in the interface between the non-metallic inclusions contained in the steel and the steel matrix and thus to produce a mechanical part superior in rolling fatigue life.
  • the cavities generated in the interface between the non-metallic inclusions and the steel matrix can be closed or reduced even without reducing the amount of the non-metallic inclusions and without reducing the diameters thereof at the time of producing the steel material.
  • a hydrostatic stress preferably at least 1000 MPa
  • FIG. 1A is a schematic view explaining a cold forging process (before compression processing) for an annular matrix according to the present invention.
  • FIG. 1B is a schematic view explaining a cold forging process (after compression processing) for the annular matrix according to the present invention.
  • FIG. 2 is a longitudinal cross-sectional view of a rolling bearing produced in accordance with the method of the present invention.
  • FIG. 3 is a diagram showing CAE analysis of the rolling bearing produced in accordance with the method of the present invention
  • FIG. 4A is a conceptual diagram showing a non-metallic inclusion and cavities in the periphery thereof before cold forging.
  • FIG. 4B is a conceptual diagram showing a non-metallic inclusion and cavities in the periphery thereof after cold forging.
  • FIG. 5 is a conceptual diagram showing a non-metallic inclusion of a hot rolled steel material and cavities in the periphery thereof.
  • the steel material required for the production method of the present invention may be machine structural steel and bearing steel.
  • These machine structural steels are generally produced as a steel material through 1) oxidation refining of molten steel in an arc melting furnace or a converter furnace, 2) reduction refining in a ladle refining furnace (LF), 3) rotary-flow vacuum degassing treatment by a rotary-flow vacuum degasser (RH treatment), 4) casting of steel ingot by continuous casting or ingot casting and 5) plastic working of steel ingot by hot rolling or hot forging and cold rolling or by cold rolling and cold forging.
  • LF ladle refining furnace
  • RH treatment rotary-flow vacuum degasser
  • the annular matrix 2 used in the production method of the present invention can be produced as follows. First of all, the steel material produced as described above (for example, steel materials defined in JIS G 4805 (2008), JIS G 4051 (2005), JIS G 4104 or JIS G 4105) is subjected to the process of the aforementioned plastic working to produce a steel material. This steel material is subjected to asset milling, extrusion processing or hot processing such as hot forging to be processed into a steel pipe or a hot forged ring, which is then cut to a predetermined length. Further, the outer diameter surface and the inner diameter surface of the cut steel pipe or hot forged ring are subjected to cutting processing, and thus provide a steel pipe or hot forged ring provided with predetermined dimensions as the annular matrix 2 .
  • the steel material produced as described above for example, steel materials defined in JIS G 4805 (2008), JIS G 4051 (2005), JIS G 4104 or JIS G 4105
  • This steel material is subjected to asset milling, extru
  • the process according to the present invention will be explained with reference to FIG. 1 .
  • the annular matrix 2 in a predetermined configuration is subjected to appropriate lubrication processing to have a temperature around room temperature.
  • the annular matrix 2 is set within an annular retraining frame 1 in a press apparatus as shown in FIG. 1A .
  • Dies 3 are arranged at upper and lower positions in the restraining frame 1 and are respectively fixed to moving parts (not shown) at upper and lower positions in the press apparatus.
  • an upper punch 3 a of the fixed die 3 and an annular upper punch 3 b arranged around the upper punch 3 a start a descending motion in the arrow direction.
  • the descending upper punch 3 a and annular upper punch 3 b applies plastic working to the inner diameter 2 a and the upper end face 2 b of the annular matrix 2 .
  • the annular matrix 2 is pushed downward, while at the same time a lower punch 3 c and an annular lower punch 3 d of the die 3 applies plastic working to the inner diameter 2 a and the lower end face 2 c of the annular matrix 2 . That is, the upper end face 2 b of the annular matrix 2 is pushed downward following the descending of the upper punch 3 a and the annular upper punch 3 b.
  • the lower end face 2 c of the annular matrix 2 is relatively pushed up by the lower punch 3 c and the annular lower punch 3 d.
  • the annular matrix 2 is subjected to compression processing to receive a hydrostatic stress by cold forging from the upper punch 3 a and the annular upper punch 3 b as well as the lower punch 3 c and the annular lower punch 3 d, thereby closing the cavities 4 existing between the steel matrix of the annular matrix 2 and the non-metallic inclusions 5 .
  • Test pieces (unit: % by mass) Steel Type C Si Mn P S Cu Ni Mo Cr Al SUJ2 1.04 0.22 0.32 0.008 0.007 — — 0.03 1.44 0.011 SUJ3 1.00 0.55 1.01 0.007 0.008 0.03 0.05 0.01 0.99 — S45C 0.44 0.20 0.70 0.01 0.01 — — — — — S53C 0.52 0.20 0.65 0.01 0.01 — — — — — —
  • This example was implemented on test pieces of steel types shown in Table 1.
  • molten steel was subjected to an oxidation refining in an arc melting furnace, a reduction refining in a ladle refining furnace (LF), and a degassing processing in a rotary-flow vacuum degasser (RH) for reducing the oxygen content in the molten steel, which was then subjected to continuous casting to produce a steel ingot.
  • the steel ingot was subjected to conventional hot rolling to provide a steel material, which was then processed to form a steel pipe by assel mill.
  • the steel pipe was then subjected to conventional spheroidized annealing to prepare a steel pipe.
  • the above-obtained steel pipe made of the test piece shown in Table 1 and having an outer diameter ⁇ of 80 mm and a thickness of 8.7 mm was sawn to a steel pipe having a width of 27.2 mm in the longitudinal direction of the steel pipe, of which the outer diameter and the inner diameter were subjected to cutting processing to provide a steel pipe having an outer diameter ⁇ of 78.5 mm and a thickness of 7.0 mm.
  • This steel pipe was then subjected to conventional lubrication processing to provide an annual matrix 2 for cold forging.
  • the annular matrix 2 was subjected to the following cold forging, as shown in FIG.
  • the cold forging applies a hydrostatic stress of up to approximately 1500 MPa to the vicinity of the rolling portion 6 , as predicted from the CAE analysis diagram shown in FIG. 3 .
  • FIG. 4A and FIG. 4B schematically show the change of the cavities 4 existing between the non-metallic inclusion 5 and the steel as the annular matrix 2 from before to after the cold forging.
  • FIG. 4A shows a configuration of the non-metallic inclusion 5 in the annular matrix 2 before the cold forging, with the cavities 4 being formed adjacent to the non-metallic inclusion 5 .
  • FIG. 4B shows that it was confirmed that the cavity 4 existing between the non-metallic inclusion 5 and the steel as the annular matrix 2 was closed after the cold forging.
  • test pieces were subjected to turning processing to form a bearing washer which is a member of a thrust rolling bearing, followed by quenching and tempering treatment. There were thus obtained a hardness of HRB 94 or more for S45C, a hardness of HRC 20 or more for S53C, and a hardness of HRC 58 or more for SUJ2 and SUJ3.
  • the test pieces were further subjected to grinding to provide a thrust rolling bearing, followed by evaluation of the rolling fatigue life thereof.
  • a commercially available ball for the thrust rolling bearing was used for the rolling body.
  • the evaluation results of the rolling fatigue life were shown in Table 3 in accordance with three-step criteria including A: excellent, B: good, and C: poor.
  • the number before hyphen “-” in the conditions in Table 3 refers to steel type condition in Table 2 while the alphabetical letter after hyphen “-” refers to processing condition in Table 2. Since the hardness is different from each other among steel types, the same evaluation cannot be made thereamong. Therefore, the evaluation of the rolling fatigue life was made based upon comparison among the same steel types.
  • Test pieces are produced in the same way as in Example 1, except that hot forged rings are produced instead of the steel pipes.
  • the method for producing the hot forged ring is as follows. First of all, molten steel was subjected to an oxidation refining in an arc melting furnace, a reduction refining in a ladle refining furnace (LF), and a degassing processing in a rotary-flow vacuum degasser (RH) for reducing the oxygen content in the molten steel, which was then subjected to continuous casting to produce a steel ingot.
  • the steel ingot was subjected to conventional hot rolling to provide a steel material, which was then processed to form a billet by shear cutting.
  • the billet was then subjected to hot forging to provide a hot forged ring having an outer diameter ⁇ of 80 mm, a thickness of 8.7 mm and a width of 27.2 mm.
  • the hot forged ring was subjected to conventional spheroidized annealing to prepare a hot forged ring.
  • the outer diameter and the inner diameter of the hot forged ring made of the above-obtained test piece shown in Table 1 were subjected to cutting processing to provide a hot forged ring having an outer diameter ⁇ of 78.5 mm and a thickness of 7.0 mm.
  • the hot forged ring was then subjected to conventional lubrication processing to form an annual matrix 2 for cold forging. Cold forging and its subsequent processes using the annular matrix 2 are the same as in Example 1. In this case, effects similar to those attained in Example 1 can also be attained.
US13/390,793 2009-08-26 2010-08-24 Method for Manufacturing Mechanical Part Excellent in Rolling Fatigue Life Abandoned US20120210765A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2009194962 2009-08-26
JP2009194962 2009-08-26
JP2010185927 2010-08-23
JP2010185927A JP5669128B2 (ja) 2009-08-26 2010-08-23 転動疲労寿命に優れた機械部品の製造方法
PCT/JP2010/064255 WO2011024792A1 (ja) 2009-08-26 2010-08-24 転動疲労寿命に優れた機械部品の製造方法

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US (1) US20120210765A1 (ja)
JP (1) JP5669128B2 (ja)
KR (1) KR20120090942A (ja)
CN (1) CN102574196B (ja)
WO (1) WO2011024792A1 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11371559B2 (en) 2018-03-22 2022-06-28 Ntn Corporation Rolling component, bearing, and method of manufacturing the same
US11421732B2 (en) 2017-11-24 2022-08-23 Ntn Corporation Rolling component, bearing, and method of manufacturing the same
US20220389966A1 (en) * 2021-06-08 2022-12-08 Aktiebolaget Skf Forged outer ring

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5896713B2 (ja) * 2011-12-09 2016-03-30 山陽特殊製鋼株式会社 転動疲労寿命に優れた機械部品の製造方法
JP6376725B2 (ja) * 2012-08-10 2018-08-22 山陽特殊製鋼株式会社 転がり疲労寿命に優れた鋼部材
WO2015034044A1 (ja) * 2013-09-05 2015-03-12 Ntn株式会社 転動部品
WO2019103039A1 (ja) * 2017-11-24 2019-05-31 Ntn株式会社 転動部品、軸受およびそれらの製造方法
JP2024514292A (ja) * 2021-03-24 2024-04-01 タタ スチール リミテッド 管の中間部分を厚くするための装置

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US20080089631A1 (en) * 2004-09-22 2008-04-17 Nsk Ltd Raceway Ring for Radial Ball Bearing and Manufacturing Method Thereof, and Manufacturing Method of High Accurate Ring and Manufacturing Apparatus Thereof
US20100068549A1 (en) * 2006-06-29 2010-03-18 Tenaris Connections Ag Seamless precision steel tubes with improved isotropic toughness at low temperature for hydraulic cylinders and process for obtaining the same
US8424205B2 (en) * 2007-01-22 2013-04-23 Nsk, Ltd. Method for manufacturing a bearing ring member

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JP4639089B2 (ja) * 2004-01-07 2011-02-23 山陽特殊製鋼株式会社 中空金属管を素材とする内周突起付きリングの製造方法
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US3286498A (en) * 1964-02-03 1966-11-22 Gen Electric Compressive forming
US20020162371A1 (en) * 2001-05-01 2002-11-07 Peter Hamstra Method of pressure-ram-forming metal containers and the like
US20080089631A1 (en) * 2004-09-22 2008-04-17 Nsk Ltd Raceway Ring for Radial Ball Bearing and Manufacturing Method Thereof, and Manufacturing Method of High Accurate Ring and Manufacturing Apparatus Thereof
US20100068549A1 (en) * 2006-06-29 2010-03-18 Tenaris Connections Ag Seamless precision steel tubes with improved isotropic toughness at low temperature for hydraulic cylinders and process for obtaining the same
US8424205B2 (en) * 2007-01-22 2013-04-23 Nsk, Ltd. Method for manufacturing a bearing ring member

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11421732B2 (en) 2017-11-24 2022-08-23 Ntn Corporation Rolling component, bearing, and method of manufacturing the same
US11371559B2 (en) 2018-03-22 2022-06-28 Ntn Corporation Rolling component, bearing, and method of manufacturing the same
US20220389966A1 (en) * 2021-06-08 2022-12-08 Aktiebolaget Skf Forged outer ring
US11867232B2 (en) * 2021-06-08 2024-01-09 Aktiebolaget Skf Forged outer ring

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Publication number Publication date
JP2011067868A (ja) 2011-04-07
WO2011024792A1 (ja) 2011-03-03
CN102574196B (zh) 2016-02-10
CN102574196A (zh) 2012-07-11
KR20120090942A (ko) 2012-08-17
JP5669128B2 (ja) 2015-02-12

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