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:
Sep. 30, 2014
Filed:
Mar. 31, 2009
Taro Abe, Bando, JP;
Taro Abe, Bando, JP;
Mitsubishi Materials Corporation, Tokyo, JP;
Abstract
A radius end mill including an end mill body which is rotated around an axis thereof; a chip discharge flute being provided at an outer periphery of a tip portion of the end mill body; a gash being provided at a tip portion of the chip discharge flute; a rake face being formed on a wall face facing an end-mill rotational direction in the chip discharge flute or the gash; a cutting edge being formed on the rake face; the cutting edge including an end cutting edge, an outer peripheral cutting edge, and a convex circular-arc-shaped corner cutting edge; the end cutting edge being formed at a side ridge portion on the tip portion of the rake face; the outer peripheral cutting edge being formed at a side ridge portion on the outer peripheral side of the rake face; the convex circular-arc-shaped corner cutting edge being formed at a corner side ridge portion formed by the end cutting edge and the outer peripheral cutting edge; wherein the corner cutting edge has a positive cutting edge inclination angle; and the portion of the rake face on the side of the side ridge portion along at least a portion of the corner cutting edge is inclined toward the rear side in the end-mill rotational direction as it approaches the outer peripheral cutting edge from the end cutting edge, and is formed in the shape of a twist face whose inclination toward the rear side in the end-mill rotational direction gradually becomes larger as it approaches the center of the convex circular arc formed by the corner cutting edge from the corner cutting edge.