Title:
FORM ROLLING METHOD FOR WORM AND FORM ROLLING DIE FOR THE METHOD
Document Type and Number:
WIPO Patent Application WO/2004/110669
Kind Code:
A1
Abstract:
A form rolling method for a spiral body for manufacturing the spiral body of a spiral body gear mechanism by from rolling and a form rolling die for the method capable of increasing the form rolled accuracy of the roundness of the form-rolled spiral body. When the form rolling nears the final stage, the outer periphery of a plane die (37) comes into contact with the form rolling pressure regulating cam (29) of a worm form rolling material (25). A contact pressure between the plane die (37) and the form rolling pressure regulating cam (29) becomes weak at a position where a cutout plane (30) is not formed though the pressed amount of the plane die (37) becomes large at the angular position thereof matching the cutout plane (30), whereby the material can be form-rolled in a form near a complete round.
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Inventors:
AMANO SHUICHI (JP)
Application Number:
PCT/JP2004/008115
Publication Date:
December 23, 2004
Filing Date:
June 10, 2004
Export Citation:
Assignee:
NISSEI CO LTD (JP)
AMANO SHUICHI (JP)
AMANO SHUICHI (JP)
International Classes:
B21H3/04; B21H3/06; B21H5/00; B21H5/02; (IPC1-7): B21H3/04
Foreign References:
| JPH07112230A | 1995-05-02 | |||
| JPH11285765A | 1999-10-19 | |||
| JP2003340542A | 2003-12-02 |
Attorney, Agent or Firm:
Tomisaki, Motonari (T/S Bldg. 13-4, Nishishinbashi 1-chome, Minato-k, Tokyo 03, JP)
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