Patents by Inventor Tadashi Hakamada

Tadashi Hakamada has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of bending extruded shapes
    Patent number: 5743124
    Abstract: A method of bending extruded shapes of the present invention controls a bending radius and a bending angle in accordance with a moving distance of a movable bending die. In the bending process, hardness of an extruded shape to be processed is measured and converted into proof stress, and the bending condition for compensating the springback is determined. A correction coefficient C showing a ratio of a practical value of the moving distance and a theoretical value of the moving distance in a case of no spring-back occurring is defined by a function of Young's modulus E, geometrical coefficient Z, bending radius R and proof stress .sigma..sub.0.2 for the extruded shape to be processed.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: April 28, 1998
    Assignees: Nippon Light Metal Co., Honda Giken KKK
    Inventors: Keiichi Sugiyama, Mitsuo Tsuge, Tadashi Hakamada, Masayoshi Ohhashi, Kunihiro Yasunaga