Patents by Inventor Hisahi Yamada

Hisahi Yamada 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 and apparatus for wire-cutting electrical discharge machining of a corner
    Patent number: 5418344
    Abstract: A wire cut electrical discharge machining apparatus or machining a corner in a workpiece, which uses a gap error voltage to generate a command velocity component. A velocity control device is used for clamping a command velocity at not more than a set velocity value. Alternatively, the error voltage is used to generate the combination of an integration component and a transient response component which is used to generate a command velocity. Also, an inside corner with a small minimum corner radius can be machined at high accuracy by defining a plurality machining tracks, which include a circular portion at an inside corner, to have the same radius.
    Type: Grant
    Filed: October 13, 1993
    Date of Patent: May 23, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takuji Magara, Hisahi Yamada