Title:
RACK MOLDING METHOD FOR HOLLOW RACK SHAFT, AND DIE THEREFOR
Document Type and Number:
Japanese Patent JP2001293618
Kind Code:
A
Abstract:
To prevent die breakage or a shortened die life due to fatigue in a rack molding method for a hollow rack shaft and in a die therefor.
Dies 1 and 2 each have recessed portions 12, so that pads if produced, flows into the recessed portions 12 to form protrusions 13 on a workpiece 4. The flow prevents such excessive force in the dies 1 and 2 as occurs when they are filled with a material. The protrusions 13 pose no drawback to geared transmission.
Inventors:
TSUBOUCHI HIROSHI
OKUBO KIYOSHI
WATANABE YASUSHI
OKUBO KIYOSHI
WATANABE YASUSHI
Application Number:
JP2000114502A
Publication Date:
October 23, 2001
Filing Date:
April 17, 2000
Export Citation:
Assignee:
NSK LTD
International Classes:
B23F17/00; B21K1/76; (IPC1-7): B23F17/00; B21K1/76
Attorney, Agent or Firm:
Amano Masakage (1 person outside)