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:
Feb. 06, 1990
Filed:
Sep. 16, 1988
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A ball end mill having a plurality of throw away inserts. Its body is formed in its hemispherical portion at diametrically opposite positions with insert mounting pockets each having a plurality of insert mounting seats. In each set, an insert having an acruate cutting edge is mounted so that the cutting edges will generate a hemispherical locus with laps of more than a quarter of the length of each cutting edge. The inserts closer to the front end of the body has an axial rake of 0 to 5 degrees, whereas those at the rear have an axial rake of 4 to 8 degrees, the latter having a larger axial rake than that of the former. Further, the insert in each pocket are arranged so that the one at the rear will have the leading end of its cutting edge located on the extension line of the cutting edge of the one in front. Thus, the inserts as a whole form a substantially S-shaped line as viewed form the front of the body.