Threading device on a numerically controlled lathe
AssigneeGildemeister Italiana S.P.A.
InventorsFranco Rigolone, Renato Rota, Oscar Gervasoni
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Abstract
A piece-threading device on a numerically controlled lathe comprises a supporting assembly having an inner rotatively driven body which, on a side thereof facing a workpiece to be threaded, comprises a plurality of threading tools, the rotatively driven body having a built-in electrical rotor (9) to which an electric stator (8) also built-in in the supporting assembly is operatively coupled, the stator (8) having a plurality of circumferential channels (6) for circulating therethrough a refrigerating and lubricating fluid.
Claims9
A device for exteriorly threading a rod-shaped workpiece in a machine tool, comprising:
- an annular hollow sleeve extending along a longitudinal axis and formed with a plurality of circumferential channels;
- a support for supporting the annular sleeve, the support having an inlet for admitting a cooling lubricating fluid into the channels, and an outlet for discharging the cooling lubricating fluid from the channels;
- an electric motor built into the support for rotating a thread-cutting tool about the longitudinal axis to exteriorly thread the workpiece, the motor having a stator supported and surrounded by the annular sleeve and cooled by the cooling lubricating fluid in the channels during rotation of the thread-cutting tool, and a rotor surrounded by the stator;
- and
- a tool holder for holding the thread-cutting tool concentric with the longitudinal axis, the tool holder being coupled to the rotor for joint rotation about the longitudinal axis.
Dependencies are inferred from the claim text.