Nsk Corporation

Kouhei Mori

Mizuki Watanabe

Kazuto Kobayashi

Hiroshi Koyama

Isao Shintou

Shunichi Karasawa

A first piece () includes a first ring portion () and a second ring portion () which are arranged side by side in an axial direction and an inner diameter and an outer diameter of the first ring portion () are respectively larger than an inner diameter and an outer diameter of the second ring portion (). A second piece () is obtained by pressing the first piece () while the first piece () is disposed between a first set and a second set.

Bearing element manufacturing method, bearing manufacturing method, machine manufacturing method, vehicle manufacturing method, bearing element, bearing, machine, and vehicle

A method of manufacturing a cylindrical ring member includes a step of forming a metal intermediate material having a cylindrical portion and a chamfering step by cold forging in which a normal chamfer portion is formed on an axial end peripheral edge of the cylindrical portion by pressing a radial end portion of an axial end surface of the cylindrical portion against an annular chamfering surface provided in a mold configuring a mold device. A chamfering step is performed by cold forging in a state where a preliminary chamfer portion, of which a width dimension in a radial direction is larger than a width dimension of the normal chamfer portion in a radial direction, is formed on the axial end peripheral edge of the cylindrical portion.

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Fujisawa, Japan

Kouhei Mori