Patents Assigned to Aoyama Seisakusho Company, Ltd.
  • Method of manufacturing a columnar material
    Patent number: 6257038
    Abstract: The invention has been accomplished in order to provide a method of manufacturing a columnar material of metal having an excellent dimensional accuracy without the need of much work time and cost, said method comprising equally forming a multiplicity of longitudinal grooves on an outer periphery of a column-shaped raw material of metal, and then uniformly squeezing tip ends of portions between the respective longitudinal grooves to make the same flat to obtain a target outside dimension.
    Type: Grant
    Filed: October 4, 1999
    Date of Patent: July 10, 2001
    Assignee: Aoyama Seisakusho Company, Ltd.
    Inventors: Takashi Asakura, Masafumi Takahashi, Junzo Ozawa