| 摘要 |
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.
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