The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 17, 2019
Filed:
Jul. 24, 2017
Mitsubishi Hitachi Tool Engineering, Ltd., Tokyo, JP;
Yoshiyuki Kobayashi, Narita, JP;
Mitsubishi Hitachi Tool Engineering, Ltd., Tokyo, JP;
Abstract
A cutting insert includes a rake face, a flank surface, and a cutting edge, the cutting edge includes a bottom cutting edge that is positioned at a front end in a central axis direction and forms a convex arc shape and an outer peripheral cutting edge aligned with a radial-direction outer end of the bottom cutting edge and forms a convex arc shape of which a curvature radius is larger than that of the bottom cutting edge, an angle formed between a tangent line to a boundary point between the bottom cutting edge and the outer peripheral cutting edge and the central axis is less than 45°, a curvature radius Rof the bottom cutting edge is 0.3 to 10 mm, and a ratio (R/R) of a curvature radius Rof the outer peripheral cutting edge to the curvature radius Rof the bottom cutting edge is 3.6 to 333.