US Patent 9352399 Drill
Patent 9352399 was granted and assigned to Mitsubishi Materials on May, 2016 by the United States Patent and Trademark Office.
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A drill comprises a drill body that is rotatable on an axis. Chip evacuating flutes, which are open on front flanks of the drill body and are extended rearwards, are formed in a periphery of the drill body on its front side. Cutting edges are formed along ridge lines where the front flanks intersect with wall surfaces of the chip evacuating flutes facing a drill rotating direction. At least first and second front flanks are formed on the front flanks in order of their locations in the drill rotating direction from its leading side to its trailing side. A clearance angle of the second front flank is greater than that of the first front flank. Intersection lines of the first and second front flanks cross the cutting edges.
US Patent 09352399 Drill US Patent 9352399 Drill
US Patent 09352399 Drill
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