Title:
FLAT DIE FOR WORM SHAFT
Document Type and Number:
Japanese Patent JP2006224159
Kind Code:
A
Abstract:
To provide a flat die for rolling with which there is no need of providing a work with a flat part in a fixed width, thus the limitation of workpiece shape is reduced, and its bending by rolling is reduced, thus the straightening of bending is made needless.
The edge parts of a screw part 71 forming a die tooth flank 71 at the upper face of a die 7 on the side opposite to the moving directions mc, op by rolling in a worm shaft 10 are made into boundary lines 23, 24 continuously changed corresponding to moving loci formed in the edge parts of a rolled part 2 on the circumferential face of a columnar stock according to rolling, and relief faces 20, 21 are formed on the upper face of the die other than the boundary lines 23, 24.
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Inventors:
MURAI YASUHIRO
SUMIYA SOICHI
TAKIMOTO SHINYA
SUMIYA SOICHI
TAKIMOTO SHINYA
Application Number:
JP2005041804A
Publication Date:
August 31, 2006
Filing Date:
February 18, 2005
Export Citation:
Assignee:
NACHI FUJIKOSHI CORP
International Classes:
B21H3/06
Domestic Patent References:
| JPH0796341A | 1995-04-11 | |||
| JP2003145242A | 2003-05-20 |
Attorney, Agent or Firm:
Junji Kawachi
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