US 7,614,831 B2
Machining tools having concave cutting surfaces for precision machining and methods of manufacturing such
Xinbing Liu, Acton, Mass. (US); and Jon Ethington, Beverly, Mass. (US)
Assigned to Panasonic Corporation, Osaka (Japan)
Filed on Mar. 13, 2006, as Appl. No. 11/374,582.
Prior Publication US 2007/0212177 A1, Sep. 13, 2007
Int. Cl. B23B 27/00 (2006.01)
U.S. Cl. 407—113  [407/120] 16 Claims
OG exemplary drawing
 
1. A machining tool with a cutting surface adapted to provide a variable projected machining width during machining, the machining tool comprising:
the cutting surface, which includes a first cutting edge and a second cutting edge positioned at an angle relative to each other and that extend to a tip of the machining tool; and
a back surface that forms a first acute angle with the cutting surface at the first cutting edge and a second acute angle with the cutting surface at the second cutting edge;
wherein:
a cross section of the cutting surface of the machining tool normal to a centerline of the machining tool is concave between the first cutting edge and the second cutting edge; and
a cross section of the back surface of the machining tool normal to the centerline of the machining tool is convex between the first cutting edge and the second cutting edge.