Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Patent
1994-09-28
1997-03-11
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having peripherally spaced cutting edges
408144, B23B 5102
Patent
active
056094477
ABSTRACT:
A drill but having a drill body with a cutting tip, an axis of symmetry, and a plurality of flutes wherein said flutes have a rake surface at said cutting tip. The cutting tip includes a plurality of side blades between said flutes and joined at a web, a plurality of flank surfaces extending from an outer diameter of said cutting tip to said axis of symmetry, and a plurality of primary cutting edges at the intersection of said flank surfaces with said rake surfaces. Both the rake and flank surfaces have extensions which would intersect each other at an intersection. The primary cutting edges include an angular surface formed on the forward end of said rake surfaces which is located such that the length of said extension of said rake surface measured between said angular surface and said intersection is a first predetermined value and the length of said extension of said flank surface measured between said angular surface and said intersection is a second predetermined value. The primary cutting edges also have a hardened layer formed from the outer surface of the primary cutting edge.
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Britzke Robert W.
Eason Jimmy
Fang Zhigang
Howell Daniel W.
Rogers Tool Works, Inc.
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