Patents by Inventor Yuichi Yamanari

Yuichi Yamanari 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).

  • Patent number: 10888906
    Abstract: A piercer plug having good base-material deformation resistance is provided. A method of manufacturing a piercer plug (10) includes the steps of; preparing a plug body (1) including a tip portion (11) and a cylindrical portion (12) having a hole (121) usable to attach a bar and located rearward of the tip portion (11); forming a build-up layer (2) on the surface of the tip portion (11); and heating the plug body (1) such that the temperature of the tip portion (11) with the build-up layer (2) formed thereon is not lower than the austenite transformation temperature and the temperature of the cylindrical portion (12) is lower than the austenite transformation temperature.
    Type: Grant
    Filed: May 10, 2017
    Date of Patent: January 12, 2021
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Yasuyoshi Hidaka, Yasuto Higashida, Naoya Shirasawa, Yuichi Yamanari
  • Publication number: 20200156132
    Abstract: A method for producing a seamless metal pipe includes the steps of: preparing a billet having a diameter (B); heating the billet; forming, in a center part of a rear end of the heated billet, a hole including four grooves extending in an axial direction of the billet, the grooves each having a groove width (D) satisfying Formula (1), a groove height (H) satisfying Formula (2), and a groove depth (L1) satisfying Formula (3); and subjecting the billet provided with the hole to piercing-rolling from a front end thereof by means of a piercing machine. By this means, the generation of burrs and internal defects at the rear end of a hollow shell after piercing-rolling can be suppressed. 0.12?D/B?0.25 ??(1) 0.10?H/B?0.20 ??(2) 0.05?L1/B?0.
    Type: Application
    Filed: June 8, 2018
    Publication date: May 21, 2020
    Inventors: Kouji Yamane, Kazuhiro Shimoda, Yuji Inoue, Shusuke Shimooka, Yuichi Yamanari
  • Publication number: 20190151917
    Abstract: A piercer plug having good base-material deformation resistance is provided. A method of manufacturing a piercer plug (10) includes the steps of; preparing a plug body (1) including a tip portion (11) and a cylindrical portion (12) having a hole (121) usable to attach a bar and located rearward of the tip portion (11); forming a build-up layer (2) on the surface of the tip portion (11); and heating the plug body (1) such that the temperature of the tip portion (11) with the build-up layer (2) formed thereon is not lower than the austenite transformation temperature and the temperature of the cylindrical portion (12) is lower than the austenite transformation temperature.
    Type: Application
    Filed: May 10, 2017
    Publication date: May 23, 2019
    Inventors: Yasuyoshi Hidaka, Yasuto Higashida, Naoya Shirasawa, Yuichi Yamanari
  • Publication number: 20180354008
    Abstract: A piercer plug with increased life and a method of manufacturing it are provided. The piercer plug 1 includes a tip portion 2 and a trunk portion 3 made of the same material as the tip portion 2 and continuous to the tip portion 2. The trunk portion 3 includes a cylindrical portion 5 having a hole used for attaching a bar. The tip portion 2 is harder than the cylindrical portion 5.
    Type: Application
    Filed: August 12, 2016
    Publication date: December 13, 2018
    Inventors: Yasuyoshi Hidaka, Yasuto Higashida, Yuichi Yamanari, Yuji Yamamoto, Tatsuya Miyai