Nsk Corporation

Yuu Yasuda

Kazuto Kobayashi

Hiroshi Koyama

Tatsuo Wakabayashi

Yuuki Mizushima

Kiyoshi Ootsuka

Mizuki Watanabe

Masato Nagano

Kiyoshi Ootuka

Kenichi Nagai

Construction is achieved that, together with preventing the occurrence of damage to a mandrel, is able to improve precision of the shape of a ring-shaped member after processing. A mandrel includes a pair of support shaft sections that are provided so as to be separated in the axial direction and so as to be concentric with each other, and a rolling shaft section that is concentrically provided in the axial direction between the pair of support shaft sections. One of the support shaft sections is provided in a state in which displacement in the axial direction with respect to the rolling shaft section is regulated. The other support shaft section is provided in a state in which displacement in a direction going away from the rolling shaft section is possible when a pressing force is applied in that direction.

Method for manufacturing ring-shaped member and manufacturing apparatus for same

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 for manufacturing an annular member includes: a cylindrical member forming step of forming a cylindrical member with an annular shape from a round bar material; and a cutting and separating step of cutting and separating the cylindrical member over an axial direction of the cylindrical member while rotating the cylindrical member, the cylindrical member being cut and separated by a shear force obtained by restraining molds, which apply an urging force to an outer circumferential surface of the cylindrical member, and by a restraining mold, which is provided with a gap on the outer circumferential surface of the cylindrical member, among a plurality of restraining molds provided on an inner circumferential surface side and an outer circumferential surface side of the cylindrical member along the axial direction, to obtain a plurality of annular members.

Method for manufacturing annular member

A method and a system for producing a ring-shaped member. A punching process is carried out on an axial intermediate part of a first intermediate annular material so as to produce a pair of ring-shaped members. A punching step includes a step in which a first punching process is carried out over a first range of the axial intermediate part in the circumferential direction, and a step in which a second punching process is carried out over a second range of the axially-oriented intermediate part, which is at least partially different than the first range, in the circumferential direction. The first punching process is carried out such that at least one tab is formed. The second punching process is carried out such that at least one separate tab is formed, thereby producing the pair of ring-shaped members.

Method and system for producing ring-shaped member for vehicle, and synchronizer ring

There is provided a method for manufacturing ring-shaped members at a good yield and high production efficiency. To achieve this object, the following is performed. A single (a sequence of) forging produces a joined body formed by radially coupling four cylindrical portions with different inner diameter sizes. A cylindrical member that has the largest inner diameter size and a cylindrical member that has the third largest inner diameter size after the forging are employed as ring-shaped members without change. A rolling process is performed on respective cylindrical member that has the smallest inner diameter size and cylindrical member that has the second largest inner diameter size to obtain ring-shaped members. Thus, two sets of ring-shaped members are obtained as two sets of inner rings and outer rings.

Method for manufacturing ring-shaped member

A raceway member () of a wheel support hub unit, having wheel or vehicle body fixing portions () extending radially outward from a solid or hollow shaft portion, and a wheel or vehicle body positioning cylindrical portion () extending concentrically with the shaft portion, the fixing portion () being formed by the cold side extrusion so that the fixing portion is integral with the shaft portion ().

Wheel support hub unit, bearing ring member for wheel support hub unit, and method of manufacturing the same

This invention provided a manufacturing method to process a small-diameter step sectionon an inside end section of a hub bodythat comprises an outward facing flangeand a positioning cylinderstably and with high precision. In this invention, an intermediate materialis pressed between a lower punchand an upper punchwith an outer peripheral surface of the intermediate materialbeing held by a lower dieand an upper die, and then a part of the intermediate materialis pressed into the lower punchsuch that the small-diameter step sectionis formed by cold plastic working.

Process for manufacturing a bearing ring member as a constituent of a rolling bearing unit for wheel support

The present invention provides a manufacturing method of a bearing ring member such as an outer ring comprising an installation portion on the outer peripheral surface and a double row of outer-ring raceways on the inner peripheral surface, in which a raw material is processed to obtain a final stage intermediate member through a first upsetting process, a forward-backward extrusion process, a second upsetting process, a burr removing process, and a punching process, wherein a movable die which leaves a stationary die in the final step is used in the second upsetting process, and the excess metal material is moved toward outside in the radial direction to a portion which become the installation section and a burr formation section, exposing a high pure metal material at least in a portion where the load of rolling bodies acts so as to ensure the rolling fatigue life of the both of outer-ring raceways.

Method for manufacturing a bearing ring member

A raceway memberof a wheel support hub unit, having wheel or vehicle body fixing portionsextending radially outward from a solid or hollow shaft portion, and a wheel or vehicle body positioning cylindrical portionextending concentrically with the shaft portion, the fixing portionbeing formed by the cold side extrusion so that the fixing portion is integral with the shaft portion

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Kanagawa, Japan

Yuu Yasuda