Thread mill
AssigneeOsg Corporation
InventorMasatoshi Watanabe
Life of this patent
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Abstract
Provided is a thread mill that can reduce tilting of an internal thread to be machined, thus increasing the tool life. A thread mill includes a plurality of thread cutting edges that are circumferentially spaced apart on a front end side of an outer circumference of a tool body, and a plurality of end cutting edges formed at the front end of the tool body. A functional cutting edge portion that cuts a workpiece, and a non-functional cutting edge portion that is relieved toward an axial shank end relative to a trajectory of the functional cutting edge portion when the tool body is caused to make one rotation about an axis are formed on the plurality of end cutting edges.
Claims6
A thread mill that cuts an internal thread in a workpiece by moving relative to the workpiece while rotating about an axis, the thread mill comprising:
- a tool body including an axial front end, and a shank end located axially opposite to the front end, and having a shaft shape centered around the axis;
- a plurality of thread cutting edges that are each formed by a plurality of axially arranged threads, and that are circumferentially spaced apart on the front end side of an outer circumference of the tool body;
- and
- a plurality of end cutting edges formed at the front end of the tool body so as to be respectively connected with the plurality of thread cutting edges on the front end side, wherein
- a functional cutting edge portion that cuts the workpiece, and a non-functional cutting edge portion that is axially relieved toward the axial shank end relative to a trajectory of the functional cutting edge portion when the tool body is caused to make one rotation about the axis, are formed on the plurality of end cutting edges.
Dependencies are inferred from the claim text.