Patents by Inventor Hiroki UEKITA

Hiroki UEKITA 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 producing roughly shaped material for rolling bearing
    Patent number: 10144984
    Abstract: A roughly shaped material for a rolling bearing of the present invention is produced by forging a steel composed of a high-carbon chrome bearing steel containing 0.7 mass % to 1.2 mass % of a carbon, and 0.8 mass % to 1.8 mass % of a chromium to a predetermined shape while heating the steel to a forging temperature in a range of (Ae1 point+25° C.) to (Ae1 point+105° C.), cooling a forged article to a temperature of Ae1 point or lower, and performing an annealing in which the forged article that is obtained is heated to a soaking temperature in a range of (Ae1 point+25° C.) to (Ae1 point+85° C.), the forged article is retained for 0.5 hours or longer, and the forged article is cooled down to 700° C. or lower at a cooling rate of 0.30° C./s or slower.
    Type: Grant
    Filed: October 27, 2014
    Date of Patent: December 4, 2018
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takefumi Yano, Shinichirou Kashiwagi, Hiroki Uekita, Toshikazu Saitou, Tetsurou Hirano, Yutaka Neishi
  • METHOD OF PRODUCING ROUGHLY SHAPED MATERIAL FOR ROLLING BEARING
    Publication number: 20160265077
    Abstract: A roughly shaped material for a rolling bearing of the present invention is produced by forging a steel composed of a high-carbon chrome bearing steel containing 0.7 mass % to 1.2 mass % of a carbon, and 0.8 mass % to 1.8 mass % of a chromium to a predetermined shape while heating the steel to a forging temperature in a range of (Ae1 point+25° C.) to (Ae1 point+105° C.), cooling a forged article to a temperature of Ae1 point or lower, and performing an annealing in which the forged article that is obtained is heated to a soaking temperature in a range of (Ae1 point+25° C.) to (Ae1 point+85° C.), the forged article is retained for 0.5 hours or longer, and the forged article is cooled down to 700° C. or lower at a cooling rate of 0.30° C./s or slower.
    Type: Application
    Filed: October 27, 2014
    Publication date: September 15, 2016
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takefumi YANO, Shinichirou KASHIWAGI, Hiroki UEKITA, Toshikazu SAITOU, Tetsurou HIRANO, Yutaka NEISHI