Patents by Inventor Hiroaki Tohyama

Hiroaki Tohyama 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).

  • Mold for casting and method for manufacture thereof
    Patent number: 7497243
    Abstract: A mold for casting primarily of SMC420, wherein a cavity forming portion comprising maraging steel, which has the toughness and the resistance to heat shock superior to those of SMC420, is provided in a vertical wall heading for a cavity surface from a molten metal inlet and a portion nearest to the molten metal inlet in the cavity surface, which are portions suffering relatively large heat shock in the contact with a molten metal. Also provided is a method for providing the cavity forming portion, which comprises filling a concave portion of the mold with a molten metal prepared by melting a welding rod by arc welding, in other words, carrying out an overlaying welding, and then cooling and solidifying the molten metal.
    Type: Grant
    Filed: October 28, 2003
    Date of Patent: March 3, 2009
    Assignee: Honda Motor Co., Ltd.
    Inventors: Hiroaki Koyama, Toshihiro Miyauchi, Yasuhiro Shimamura, Michiharu Hasegawa, Naoji Yamamoto, Masahito Hasuike, Noriyuki Miyazaki, Hiroaki Tohyama
  • Mold for casting and method for manufacture thereof
    Publication number: 20060151139
    Abstract: A mold for casting primarily of SMC420, wherein a cavity forming portion comprising maraging steel, which has the toughness and the resistance to heat shock superior to those of SMC420, is provided in a vertical wall heading for a cavity surface from a molten metal inlet and a portion nearest to the molten metal inlet in the cavity surface, which are portions suffering relatively large heat shock in the contact with a molten metal. Also provided is a method for providing the cavity forming portion, which comprises filling a concave portion of the mold with a molten metal prepared by melting a welding rod by arc welding, in other words, carrying our an overlaying welding, and then cooling and solidifying the molten metal.
    Type: Application
    Filed: October 28, 2003
    Publication date: July 13, 2006
    Inventors: Hiroaki Koyama, Toshihiro Miyauchi, Yasuhiro Shimamura, Michiharu Hasegawa, Naoji Yamamoto, Masahito Hasuike, Noriyuki Miyazaki, Hiroaki Tohyama