Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
DRAWING METHOD AND APPARATUS
Document Type and Number:
Japanese Patent JP2007268571
Kind Code:
A
Abstract:

To provide a drawing method and apparatus for forming a boss part which has a diameter smaller than the outside diameter of a base stock and has a certain height.

The drawing method is provided in which a disk-like workpiece W is attached through a mandrel 4 on the distal end of a rotating spindle 2, the workpiece W is fixed with a chuck bar 3a which is rotated concentrically with the spindle 2 and drawing is performed by bringing a drawing roller into contact with the workpiece W. The drawing method is characterized in that the boss part is formed by: bending the circumferential part of the workpiece W with a drawing roller R1; performing dehiscing work by pressing a dehiscing roller R2 against the bent circumferential part; performing expanding work by pressing an expanding roller R3 against the dehisced part of the workpiece W which is dehisced with a dehiscing roller R2; and pressing an expanding roller R4 against the expanded part of the workpiece W which is expanded with the expanding roller R3.

COPYRIGHT: (C)2008,JPO&INPIT


Inventors:
IIO YOSHIO
MURATA SHIGEO
Application Number:
JP2006098198A
Publication Date:
October 18, 2007
Filing Date:
March 31, 2006
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
NIPPON SPINDLE MFG CO LTD
International Classes:
B21D22/16; B21H1/02
Domestic Patent References:
JPH1029029A1998-02-03
JPH01278919A1989-11-09
JPH0985370A1997-03-31
Attorney, Agent or Firm:
Osamu Mori



 
Previous Patent: LASER BEAM WELDING EQUIPMENT

Next Patent: COATING MATERIAL