| 摘要 |
Tool-holder (5) makes it possible to rotate a tool at high speed around its axis of symmetry. Its tapered end (26) is engaged in the tapered bore (16) provided in the spindle (6). In a bore of suitable shape a clamp (2) is engaged, adapted to secure the electrode tool end (1) rigidly. An injection chamber (28) communicates with the bore and is connected by radial channels (27) to a fluid inlet. The clamp (2) has radial grooves to bring the cooling fluid (25) from the injection chamber (28) to the surface of the tool (1). A sealed circuit (12,13,15) channels the liquid; it is connected by an input channel of small diameter which passes through the spindle body (10) to a small liquid inlet in the mobile element of the machining head or in the intermediary fixing element mounted on said mobile element. An annular seal (14) of small diameter is mounted in the spindle body around said channel (11').
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