US 11,873,864 B2
Method for increasing the load-bearing capacity, and rolling device for hard rolling a surface-hardened rolling-bearing raceway
Joerg Rollmann, Lippstadt (DE); Thomas Handreck, Anroechte (DE); Bernd Lueneburg, Muelheim (DE); Matthias Toefke, Lippstadt (DE); and Christian Liewen, Lippstadt (DE)
Assigned to thyssenkrupp rothe erde Germany GmbH, Dortmund (DE); and thyssenkrupp AG, Essen (DE)
Appl. No. 17/782,126
Filed by thyssenkrupp rothe erde Germany GmbH, Dortmund (DE); and thyssenkrupp AG, Essen (DE)
PCT Filed Nov. 26, 2020, PCT No. PCT/EP2020/083446
§ 371(c)(1), (2) Date Jun. 2, 2022,
PCT Pub. No. WO2021/110519, PCT Pub. Date Jun. 10, 2021.
Claims priority of application No. 10 2019 218 794.3 (DE), filed on Dec. 3, 2019.
Prior Publication US 2022/0412407 A1, Dec. 29, 2022
Int. Cl. F16C 33/64 (2006.01); B21H 1/12 (2006.01); C21D 9/40 (2006.01); F16C 19/38 (2006.01)
CPC F16C 33/64 (2013.01) [B21H 1/12 (2013.01); C21D 9/40 (2013.01); F16C 19/386 (2013.01); F16C 2220/44 (2013.01); F16C 2223/10 (2013.01); F16C 2240/18 (2013.01); F16C 2360/31 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for increasing a load capacity of a surface-hardened rolling bearing raceway of a rolling bearing ring element, the method comprising:
providing a rolling bearing ring element that has an unhardened core region and, at least in certain portions, an outer layer hardened to a surface hardening depth, with a rolling bearing raceway being formed in a region of the hardened outer layer;
hard rolling the rolling bearing raceway with a roll, wherein a diameter of the roll is 8 to 25 times the surface hardening depth, wherein a surface pressure prevailing in a rolling contact between the roll and the rolling bearing raceway during the hard rolling is between 2000 MPa and 3300 MPa; and
machining the rolling bearing raceway after the hard rolling.