Patents Assigned to Hitachi Tool Engineering Ltd.
  • Radius end mill having radius edge enhanced in resistance to chipping and fracture
    Patent number: 6846135
    Abstract: In a radius end mill having a bottom edge formed on the end face thereof, a radius edge designed in a substantially quarter arc shape and formed at a corner portion thereof, and an outer peripheral edge formed spirally on the side surface thereof, the bottom edge and the radius edge being continuously connected to each other at a connecting point A while the radius edge is continuously connected to each other at a connecting point B, when a view taken along a plane that passes through the connecting points A and B and crosses a rake face of the radius edge is represented by an R cross-sectional view, the rake face of the radius edge is designed to have a convex curved line extending from the connecting point A to the connecting point B in the R cross-sectional view.
    Type: Grant
    Filed: March 18, 2003
    Date of Patent: January 25, 2005
    Assignee: Hitachi Tool Engineering Ltd.
    Inventors: Takahito Kuroda, Ryosuke Okanishi, Yasushi Sakamoto, Katsutoshi Maeda
  • Radius end mill having radius edge enhanced in resistance to chipping and fracture
    Publication number: 20030180104
    Abstract: In a radius end mill having a bottom edge formed on the end face thereof, a radius edge designed in a substantially quarter arc shape and formed at a corner portion thereof, and an outer peripheral edge formed spirally on the side surface thereof, the bottom edge and the radius edge being continuously connected to each other at a connecting point A while the radius edge is continuously connected to each other at a connecting point B, when a view taken along a plane that passes through the connecting points A and B and crosses a rake face of the radius edge is represented by an R cross-sectional view, the rake face of the radius edge is designed to have a convex curved line extending from the connecting point A to the connecting point B in the R cross-sectional view.
    Type: Application
    Filed: March 18, 2003
    Publication date: September 25, 2003
    Applicant: Hitachi Tool Engineering Ltd.
    Inventors: Takahito Kuroda, Ryousuke Okanishi, Yasushi Sakamoto, Katsutoshi Maeda
  • Cermet alloy and process for its production
    Patent number: 5149595
    Abstract: A cermet alloy having a structure comprising a hard phase and a bonding phase, said hard phase comprising (1) at least one of MC, MN and MCN, wherein M is at least one element selected from Ti, Zr, Hf, Th, V, Nb, Ta, Pa, Cr, Mo, U and W and (2) at least one W-Co-B compound; said bonding phase comprising Co. The cermet has superior toughness and hardness, and can be worked by conventional sintering methods. The invention also includes a method for producing the cermet.
    Type: Grant
    Filed: September 11, 1991
    Date of Patent: September 22, 1992
    Assignees: Hitachi Metals Ltd., Hitachi Tool Engineering Ltd.
    Inventors: Katsuhiko Kojo, Akibumi Negishi, Hisaaki Ida