FLAT DIE FOR FORM ROLLING OF WORM SHAFT

Title:

FLAT DIE FOR FORM ROLLING OF WORM SHAFT

Document Type and Number:

Japanese Patent JP2007290000

Kind Code:

A

Abstract:

To provide a flat die for the form rolling of a worm shaft in which a flat part of a predetermined width for a straightening die needs not be provided on a work adjacent to a circumferential surface form rolling part of a columnar material, and applicable works are not limited, while the bend of the work by the form rolling is small, and a step for straightening is unnecessary.

The lead angle of a thread at a starting end of biting parts 30 of flat dies 6, 7 is set to be β1; the lead angle of a thread at a terminating end of finishing parts 31 of the flat dies is set to be β2, and the relationship of β1 <β2 is set. Threads are formed by continuously and smoothly changing the lead angle from the lead angle β1 of the thread at the starting end of the biting parts of the flat dies to the lead angle β2 of the thread at the terminating end of the finishing parts of the flash dies.

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Inventors:

SUMIYA SOICHI
MURAI YASUHIRO

Application Number:

JP2006120411A

Publication Date:

November 08, 2007

Filing Date:

April 25, 2006

Export Citation:

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Assignee:

NACHI FUJIKOSHI CORP

International Classes:

B21H3/06

Attorney, Agent or Firm:

Junji Kawachi

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