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Title:
MOLD DEVICE FOR MANUFACTURING COLUMNAR ROLLING ELEMENT, METHOD FOR MANUFACTURING COLUMNAR ROLLING ELEMENT, METHOD FOR MANUFACTURING ROLLING BEARING, METHOD FOR MANUFACTURING VEHICLE, AND METHOD FOR MANUFACTURING MACHINE DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/021551
Kind Code:
A1
Abstract:
[Problem] When manufacturing of a columnar rolling element, to prevent, to the utmost extent, formation of an excess thickness of a radial outer part or of recesses in both axial end surfaces in an intermediate blank extracted from a mold device for performing compression molding. [Solution] An annular recess 27 is provided to the inner peripheral surfaces 20a of molding recesses 19a which are provided to a fixed side mold 17a and a moving side mold 18a. The fixed side mold 17a and the moving side mold 18a are brought close to each other in an axial direction so as to compress and mold the intermediate blank 23, in a state where both the axial ends of the intermediate blank 23 are inserted into the molding recesses 19a. When doing so, a portion of the material for the intermediate blank 23 is caused to enter the annular recess 27, and an undercut part 32 is formed radially outward of the intermediate blank 23b that has been compressed and molded. Then, when both the axial ends of the intermediate blank 23b are pulled out from the inside of the molding recesses 19a in the axial direction, the undercut part 32 is reduced in diameter by step parts 29 present at the axial ends of the annular recess 27.

Inventors:
YASUDA, Yuu (1-5-50 Kugenumashinmei, Fujisawa-sh, Kanagawa 01, 〒2518501, JP)
WATANABE, Mizuki (1-5-50 Kugenumashinmei, Fujisawa-sh, Kanagawa 01, 〒2518501, JP)
MIZUSHIMA, Yuuki (1-5-50 Kugenumashinmei, Fujisawa-sh, Kanagawa 01, 〒2518501, JP)
Application Number:
JP2018/015885
Publication Date:
January 31, 2019
Filing Date:
April 17, 2018
Export Citation:
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Assignee:
NSK LTD. (6-3 Ohsaki 1-chome, Shinagawa-ku Tokyo, 60, 〒1418560, JP)
International Classes:
B21K1/02; B21J5/02; B21J5/06; B21J13/02; B21J13/14; F16C33/34
Foreign References:
JP2003181590A2003-07-02
JP4225250B22009-02-18
JP4942650B22012-05-30
JP5247873B22013-07-24
Attorney, Agent or Firm:
KIWA INTERNATIONAL (SKI Toranomon 5F, 2-13-10 Nishi-Shimbashi Minato-k, Tokyo 03, 〒1050003, JP)
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