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. 25, 2003
Filed:
Feb. 15, 2001
Applicant:
Inventors:
Nagatoshi Kunimori, Itami, JP;
Yasuyuki Kanada, Itami, JP;
Assignee:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23B 2/716 ; B26D 1/12 ;
U.S. Cl.
CPC ...
B23B 2/716 ; B26D 1/12 ;
Abstract
The purpose is to improve the surface roughness Rz of a cut surface to 1.6 &mgr;m or under in cutting e.g. hardened steel. The ball end mill has a cutting blade made of a polycrystalline hard sintered material containing 20 to 95 vol % of cubic boron nitride. The cutting blade has a ridge portion having a radius of curvature of 5 to 30 &mgr;m. A flank and a rake face or a negative land of the cutting blade connect smoothly with the ridge with the radius of curvature. The ridge portion of the cutting blade has a surface roughness of 0.1 to 1.0 &mgr;m in terms of 10-point average roughness (Rz).