ROLL BEARING PART AND MANUFACTURING METHOD THEREOF

• Main Authors: YAMASHITA TOMOHIRO, HIRAGAMI DAISUKE
• Format: Patent
• Language: English; Japanese
• Published: 09.07.2020
• Subjects: ALLOYS; BEARINGS; BLASTING; CHEMISTRY; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FERROUS OR NON-FERROUS ALLOYS; FLEXIBLE SHAFTS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL ENGINEERING; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; THERMAL INSULATION IN GENERAL; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WEAPONS

To provide a carburization bearing steel part superior in indentation-resistant lifetime while keeping surface hardness equal to a general bearing part level.SOLUTION: As for a roll bearing part having predetermined component composition, a retained austenite area rate in the range of 300 μm depth from the surface of a rolling contact surface is not more than 8%, Vickers' hardness in the range of 800 μm depth from the surface of the rolling contact surface is not less than 760 HV, a compressive residual stress in the range of 300 μm depth from the surface of the rolling contact surface is 750-2000 MPa, and a plastic flow layer of a thickness 1-20 μm is on the surface layer of the rolling contact surface.SELECTED DRAWING: None 【課題】表面硬さを一般軸受部品レベルと同等に維持しながら耐圧痕寿命に優れる浸炭軸受鋼部品を提供すること。【解決手段】所定の成分組成を有し、転動面の表面から３００μｍ深さの範囲の残留オーステナイト面積率が８％以下であり、転動面の表面から８００μｍ深さの範囲のビッカース硬さが７６０ＨＶ以上であり、転動面の表面から３００μｍ深さの範囲の圧縮残留応力が７５０ＭＰａ〜２０００ＭＰａであり、転動面の表層に厚さ１〜２０μｍの塑性流動層を有する転がり軸受部品。【選択図】なし