Nsk Corporation

Mizuki Watanabe

Kouhei Mori

Kazuto Kobayashi

Hiroshi Koyama

Yuu Yasuda

Isao Shintou

Yuuki Mizushima

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

With respect to the manufacture of cylindrical rolling bodies, excess material on an outside section in the radial direction and recesses in both end surfaces in the axial direction are not generated as much as possible in the intermediate material that is removed from a molding device for performing compression molding. Annular concave sectionsare provided on the inner-circumferential surfacesof molding concave sectionsprovided in a stationary-side moldand a movable-side mold. The stationary-side moldand the movable-side moldare brought close to each other in the axial direction while compressing the intermediate materialin a state in which both side sections in the axial direction of the intermediate materialare inserted into the molding concave sections. At this time, a part of the material of the intermediate materialis made to enter inside the annular concave sections, and undercut sectionsare formed on the outer side in the radial direction of a compression-molded intermediate material. After that, when removing both side sections in the axial direction of the intermediate materialfrom the inside of the molding concave sectionsin the axial direction, the undercut sectionsare drawn through or handled by stepped sectionsexisting at the end sections in the axial direction of the annular concave sections

Molding device for manufacturing cylindrical rolling body, manufacturing method for cylindrical rolling body, manufacturing method for rolling bearing, manufacturing method for vehicle, and manufacturing method for mechanical apparatus

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.

Method for manufacturing cylindrical ring member, bearing, clutch, vehicle, and machine

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Kanagawa, Japan

Mizuki Watanabe