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1. WO2021002179 - RACEWAY RING FOR ROLLING BEARING

Publication Number WO/2021/002179
Publication Date 07.01.2021
International Application No. PCT/JP2020/023395
International Filing Date 15.06.2020
IPC
C21D 9/40 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
40for rings; for bearing races
F16C 33/62 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
CSHAFTS; FLEXIBLE SHAFTS; MECHANICAL MEANS FOR TRANSMITTING MOVEMENT IN A FLEXIBLE SHEATHING; ELEMENTS OF CRANKSHAFT MECHANISMS; PIVOTS; PIVOTAL CONNECTIONS; ROTARY ENGINEERING ELEMENTS OTHER THAN GEARING, COUPLING, CLUTCH OR BRAKE ELEMENTS; BEARINGS
33Parts of bearings; Special methods for making bearings or parts thereof
30Parts of ball or roller bearings
58Raceways; Race rings
62Selection of substances
F16C 33/64 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
CSHAFTS; FLEXIBLE SHAFTS; MECHANICAL MEANS FOR TRANSMITTING MOVEMENT IN A FLEXIBLE SHEATHING; ELEMENTS OF CRANKSHAFT MECHANISMS; PIVOTS; PIVOTAL CONNECTIONS; ROTARY ENGINEERING ELEMENTS OTHER THAN GEARING, COUPLING, CLUTCH OR BRAKE ELEMENTS; BEARINGS
33Parts of bearings; Special methods for making bearings or parts thereof
30Parts of ball or roller bearings
58Raceways; Race rings
64Special methods of manufacture
C21D 1/06 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
06Surface hardening
C21D 1/18 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
18Hardening; Quenching with or without subsequent tempering
Applicants
  • NTN株式会社 NTN CORPORATION [JP]/[JP]
Inventors
  • 山田 昌弘 YAMADA, Masahiro
  • 大木 力 OHKI, Chikara
Agents
  • 特許業務法人深見特許事務所 FUKAMI PATENT OFFICE, P.C.
Priority Data
2019-12523904.07.2019JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) RACEWAY RING FOR ROLLING BEARING
(FR) BAGUE DE CHEMIN DE ROULEMENT POUR PALIER À ROULEMENT
(JA) 転がり軸受の軌道輪
Abstract
(EN)
This raceway ring (10) for a rolling bearing is composed of steel and is provided with an outer circumferential surface (10d) and an inner circumferential surface (10c). One of the outer circumferential surface (10d) and the inner circumferential surface (10c) has a raceway surface (10e). The other of the outer circumferential surface (10d) and the inner circumferential surface (10c) serves as an anti-raceway surface. The volumetric fraction of residual austenite in the anti-raceway surface is smaller than the volumetric fraction of residual austenite in the raceway surface (10e). The difference between the volumetric fraction of residual austenite in the raceway surface (10e) and the volumetric fraction of residual austenite in the anti-raceway surface is at least 5 volume percent. The average particle diameter of prior austenite grains in the raceway surface (10e) is at most 8 μm.
(FR)
Cette bague de chemin de roulement (10) pour un palier à roulement est composée d'acier et est pourvue d'une surface circonférentielle externe (10d) et d'une surface circonférentielle interne (10c). Une surface parmi la surface circonférentielle externe (10d) et la surface circonférentielle interne (10c) a une surface de chemin de roulement (10e). L'autre surface parmi la surface circonférentielle externe (10d) et la surface circonférentielle interne (10c) sert de surface anti-chemin de roulement. La fraction volumique d'austénite résiduelle dans la surface anti-chemin de roulement est inférieure à la fraction volumique d'austénite résiduelle dans la surface de chemin de roulement (10e). La différence entre la fraction volumique d'austénite résiduelle dans la surface de chemin de roulement (10e) et la fraction volumique d'austénite résiduelle dans la surface anti-chemin de roulement est d'au moins 5 pour cent en volume. Le diamètre moyen des particules des grains d'austénite antérieure dans la surface de chemin de roulement (10e) est d'au plus 8 µm.
(JA)
転がり軸受の軌道輪(10)は、鋼からなり、外周面(10d)と、内周面(10c)とを備えている。外周面(10d)及び内周面(10c)の一方は、軌道面(10e)を有する。外周面(10d)及び内周面(10c)の他方は、反軌道面となっている。反軌道面における残留オーステナイトの体積比率は、軌道面(10e)における残留オーステナイトの体積比率よりも小さい。軌道面(10e)における残留オーステナイトの体積比率と反軌道面における残留オーステナイトの体積比率との差は、5体積パーセント以上である。軌道面(10e)における旧オーステナイト結晶粒の平均粒径は、8μm以下である。
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