Rotary cutting tool having main body partially coated with hard coating
AssigneeOsg Corporation
InventorTakayuki Nakajima
Life of this patent
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Abstract
A rotary cutting tool including a cylindrical main body which is partially coated with a hard coating, so as to include a coated portion and a non-coated portion that is not coated with the hard coating. The cylindrical main body has: (a) at least one flute each of which extends from an axially distal end of the main body portion to an axially proximal end of the main body portion, and (b) at least one land each of which is provided by a peripheral portion of the cylindrical main body not cut away by the flute or flutes. The coated portion is provided by at least an outer circumferential surface of each land, while the non-coated portion is provided by at least a rear-side portion of a flute surface of each flute as viewed in the predetermined rotating direction.
Claims12
A rotary cutting tool which is to be rotated in a predetermined rotating direction for cutting a workpiece, said rotary cutting tool comprising:
- a cylindrical main body which is partially coated with a hard coating, so as to include a coated portion and a non-coated portion that is not coated with said hard coating,
- wherein said cylindrical main body has:
- at least one flute each of which has a predetermined width and extends from an axially distal end of said main body portion to an axially proximal end of said main body portion, and
- at least one land each of which is provided by a peripheral portion of said cylindrical main body not cut away by said at least one flute;
- and wherein said coated portion is provided by at least an outer circumferential surface of each of said at least one land, while said non-coated portion is provided by at least a rear-side portion of a flute surface of each of said at least one flute as viewed in said predetermined rotating direction.
A tap which is to be rotated in a predetermined rotating direction for forming an internal thread in a workpiece, said tap comprising:
- an externally-threaded cylindrical main body which is partially coated with a hard coating, so as to include a coated portion and a non-coated portion that is not coated with said hard coating,
- wherein said externally-threaded cylindrical main body has:
- a chamfer portion provided by an axially distal end portion of said externally-threaded cylindrical main body;
- a full-form thread portion contiguous to said chamfer portion in an axial direction of said externally-threaded cylindrical main body;
- at least one flute each of which has a predetermined width and extends from an axially distal end of said externally threaded body to an axially proximal end of said externally-threaded cylindrical main body;
- at least one land each of which is provided by a peripheral portion of said externally-threaded cylindrical main body not cut away by said at least one flute;
- and
- a rake surface which is provided by a rear-side portion of a flute surface of each of said at least one flute as viewed in said predetermined rotating direction;
- and wherein said coated portion is provided by at least an outer circumferential surface of each of said at least one land, while said non-coated portion is provided by at least a portion of said rake surface which is located in said chamfer portion.
Dependencies are inferred from the claim text.