公开(公告)号：US20170108045A1

公开(公告)日：2017-04-20

申请号：US15127236

申请日：2015-03-19

Applicant: NTN CORPORATION

Inventor： Naoki YASHIRO ,  Yuuta ITOU ,  Takahiro OKUNO ,  Kouya OOHIRA

IPC: F16C33/64 ,  F16C33/62 ,  F16C33/78 ,  B22F3/16 ,  C21D1/18 ,  C22C38/12 ,  C22C38/08 ,  C21D9/40 ,  C21D8/00 ,  F16C19/06 ,  B22F3/24

CPC classification number: F16C33/64 ,  B22F3/16 ,  B22F3/24 ,  B22F5/106 ,  B22F2003/248 ,  B22F2301/35 ,  B22F2998/10 ,  C21D1/18 ,  C21D8/005 ,  C21D9/40 ,  C22C33/02 ,  C22C38/00 ,  C22C38/08 ,  C22C38/12 ,  F16C19/06 ,  F16C33/62 ,  F16C33/7856 ,  F16C2204/60 ,  F16C2220/20 ,  F16C2220/44 ,  F16C2223/10 ,  B22F3/02 ,  B22F3/10

Abstract: Partially diffusion-alloyed steel powder is subjected to compression molding and then sintered to form a sintered metal material (10′), and a raceway surface (2) is formed on the sintered metal material (10′) through plastic working, to thereby manufacture a raceway ring (1). With at least a risk volume of the raceway ring (1) being adopted as a prediction volume, a square root √areamax of the maximum pore envelope area estimated to be present at least in the prediction volume is set to be less than 50 μm. With this, there is provided a raceway ring for a rolling bearing that has an increased rolling fatigue life at low cost.