Patents Assigned to Teikoku Kuromu Co., Ltd.
  • Press molding die and manufacturing method of same
    Patent number: 7340934
    Abstract: A press molding die capable of preventing a workpiece from moving is provided. The press molding die includes a punch for pressing a workpiece; a molding die having a molding surface on which the workpiece is placed and a concave portion which is formed on the molding surface and which has a shape corresponding to the punch; a pad for pressing a part of the workpiece placed on the molding surface and which is on the periphery of the concave portion; and a micro-rough layer which is formed by performing a particulate coating process on at least one of a portion of the pad, for pressing the workpiece, and a portion of the molding surface, corresponding to the portion of the pad. Preferably, the height of roughness of the micro-rough layer is 0.01 to 0.06 mm, and the particulate coating process is performed using a silicofluoric chrome plating solution.
    Type: Grant
    Filed: March 18, 2004
    Date of Patent: March 11, 2008
    Assignees: Toyota Jidosha Kabushiki Kaisha, Teikoku Kuromu Co., Ltd.
    Inventors: Takanori Kurokawa, Kazuo Fukaya, Takahiro Ichikawa, Takashige Yoneda, Taketoshi Minami
  • Press molding die and manufacturing method of same
    Publication number: 20040194527
    Abstract: A press molding die capable of preventing a workpiece from moving is provided. The press molding die includes a punch for pressing a workpiece; a molding die having a molding surface on which the workpiece is placed and a concave portion which is formed on the molding surface and which has a shape corresponding to the punch; a pad for pressing a part of the workpiece placed on the molding surface and which is on the periphery of the concave portion; and a micro-rough layer which is formed by performing a particulate coating process on at least one of a portion of the pad, for pressing the workpiece, and a portion of the molding surface, corresponding to the portion of the pad. Preferably, the height of roughness of the micro-rough layer is 0.01 to 0.06 mm, and the particulate coating process is performed using a silicofluoric chrome plating solution.
    Type: Application
    Filed: March 18, 2004
    Publication date: October 7, 2004
    Applicants: Toyota Jidosha Kabushiki Kaisha, Teikoku Kuromu Co., Ltd.
    Inventors: Takanori Kurokawa, Kazuo Fukaya, Takahiro Ichikawa, Takashige Yoneda, Taketoshi Minami
  • Method of machining a press die
    Patent number: 5069089
    Abstract: A method of machining a press die. A scabrous surface is formed by cutting a die block of the press die. Then, part of the scabrous surface of the die block is ground to form a smooth surface. The part contacts with a work from an initial stage of press working of the work by the press die. Finally, a friction resistant material layer is coated over the smooth surface.
    Type: Grant
    Filed: September 20, 1990
    Date of Patent: December 3, 1991
    Assignees: Fuji Jukogyo Kabushiki Kaisha, Teikoku Kuromu Co., Ltd.
    Inventors: Toshio Yasuno, Toshihiro Thukagoshi, Shinji Hoshii, Yasuo Imaizumi