Rotary cutting tool
AssigneeOsg Corporation
InventorsJiro Osawa, Tomonori Yoda, Yusuke Tanaka
Life of this patent
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Abstract
A rotary cutting tool includes: a blade portion; a shank portion having a diameter larger than a diameter of the blade portion; and a tapered connecting portion connecting the blade portion and the shank portion. The shank portion includes a plurality of coolant-guide recessed grooves provided in its outer circumferential surface. Each of the coolant-guide recessed grooves has a groove depth and a groove width that is larger than the groove depth. Each of the coolant-guide recessed grooves has a groove bottom that is shaped such that the groove depth is reduced as the each of the coolant-guide recessed grooves extends from its start end toward a groove-depth regional-change position in which a tendency of change of the groove depth is changed.
Claims11
A rotary cutting tool comprising:
- a blade portion including a cutting edge provided in the blade portion;
- a shank portion having a diameter larger than a diameter of the blade portion;
- and
- a tapered connecting portion connecting the blade portion and the shank portion;
- wherein the shank portion includes a plurality of coolant-guide recessed grooves which are provided in an outer circumferential surface of the shank portion and which are circumferentially spaced apart from each other, such that a start end of each of the coolant-guide recessed grooves is located in an end surface of the shank portion, and such that a terminal end of each of the coolant-guide recessed grooves is located in a tapered outer circumferential surface of the connecting portion,
- wherein each of the coolant-guide recessed grooves has a groove cross section such that a groove width of each of the coolant-guide recessed grooves is larger than a groove depth of each of the coolant-guide recessed grooves, each of the coolant-guide recessed grooves being configured to guide a coolant from the shank portion to the connecting portion, and
- wherein each of the coolant-guide recessed grooves has a groove bottom that is shaped such that the groove depth is reduced as the each of the coolant-guide recessed grooves extends from the start end toward a groove-depth regional-change position in which a tendency of change of the groove depth is changed.
Dependencies are inferred from the claim text.