Multi-station machine with rotating transfer for machining pieces

Rotating transfer multi-station machine for machining pieces, including:

• an indexable rotary turret (1) equipped with a plurality of work-holding devices distributed around the periphery of the turret (1),
• a plurality of devices for holding and positioning tools, distributed between a plurality of machining stations around the turret (1) and adapted to machine the workpieces carried by the work-holding devices,
• in which machine:
• the work-holding devices include turning spindles (3, 15), in fixed positions on the turret (1), each with its axis (I, II) oriented toward the periphery of the turret (1), and which are capable of driving a workpiece in fast rotation for an operation of turning by turning tools in at least one of the machining stations (4, 14),
• the turning spindles (3, 15) are capable of being indexed in all angular positions to allow other machining of the workpiece by suitable other tools in at least one of the machining stations (4, 14),
• characterized in that:
• the work-holding devices are electrospindles (3, 5, 15), having a compact structure that minimizes their overall size in the axial and radial directions, consisting of a spindle (100) having a section (100a) supported by two rolling bearings or bearings (6, 7) and carrying directly the rotor (8) of the spindle drive motor,
• the electrospindles (3, 5, 15) are disposed on the turret (1) side by side in contact with or in the immediate vicinity of each other and one after the other.