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:
Nov. 19, 2013
Filed:
Nov. 04, 2008
Haruhisa Higasayama, Toyota, JP;
Yoshimitsu Nagashima, Narita, JP;
Haruhisa Higasayama, Toyota, JP;
Yoshimitsu Nagashima, Narita, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi, JP;
Hitachi Tool Engineering, Ltd., Tokyo, JP;
Abstract
This aims to provide a ball end mill capable of preventing the occurrence of a 'pluck' off a work face. The ball end mill () is equipped with two cutting edges (and) formed at its spherical tips. The rake face () of the cutting edge () has its inner circumference end arranged at a position offset farther forward of a rotating direction than a spindle. The rake face () of the cutting edge () has its inner circumference end arranged at a position protruding by a predetermined distance from the spindle to the opposite side of the cutting edge forming side in the radial direction. The portion of the cutting edge () from a connecting portion (), which is formed midway of a ridgeline () or a boundary line between the rake face () of the cutting edge () and a flank (), to the outer circumference end of the cutting edge () is a main cutting edge (). The portion of the cutting edge () from the connecting portion () to the inner circumference end of the cutting edge () is an auxiliary cutting edge (). The connecting portion () of the cutting edge () is the portion which protrudes the farthest in the cutting edge () to the tip side of the spindle in the axial direction. The cutting edge () is constituted like the cutting edge ().