Patents Assigned to Kabushiki Kaisha Fujikihan
  • Surface treatment method for a steel workpiece using high speed shot peening
    Patent number: 5816088
    Abstract: Fatigue-resistance is significantly increased by performing shot peening using fine shots. A plurality of particles of hard metal having a diameter ranging from 20 to 100 micrometers are ejected onto a surface of a steel workpiece at an impinging speed greater than 80 m/second. The impinging speed is controlled so that the upper limit of temperature rising of the surface of the workpiece is maintained at a temperature more than 150.degree. C. but less than the temperature at which recovery recrystallization and austentizing of steel occurs.
    Type: Grant
    Filed: April 15, 1997
    Date of Patent: October 6, 1998
    Assignees: Suncall Corporation, Kabushiki Kaisha Fuji Seisakusho, Kabushiki Kaisha Fujikihan
    Inventors: Yoshiro Yamada, Masaaki Ishida, Kazuhiro Uzumaki