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US 7,377,732 B2Granted
Thread mill having flute twisting in direction opposite to rotating direction
AssigneeOsg Corporation
InventorsHaruyasu Andoh, Takayuki Nakajima
Life of this patent
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AssigneeOsg Corporation
InventorsHaruyasu Andoh, Takayuki Nakajima
Estimating the term…
A thread mill that is to be moved along a helical interpolation path while being rotated about an axis of the thread mill in a rotating direction, for forming a thread in a circumferential surface of a workpiece. The thread mill includes a cylindrical main body having (a) at least one spiral flute formed in an outer circumferential surface of the cylindrical main body, and (b) at least one cutting edge each provided by a rear-side one of widthwise opposite edges, as viewed in the rotating direction, of a corresponding one of the at least one spiral flute. Each of the at least one spiral flute extends in a direction opposite to the rotating direction as viewed in a direction away from a proximal end of the cylindrical main body toward a distal end of the cylindrical main body. Also disclosed is a method of forming the thread by using the thread mill.
A thread mill that is to be moved along an orbit path about an axis of a preparation hole being formed on a workpiece and having a chamfer at an opening edge while being rotated in one rotating direction about an axis of the thread mill in the preparation hole, for forming an internal thread in an inner circumferential surface of the preparation hole, said thread mill comprising:
Dependencies are inferred from the claim text.