Machine tool with coolant flushing system

A machine tool, comprising

• a spindle having a tool receptacle for receiving tool holders, and an internal duct running longitudinally through said spindle to said tool receptacle,
• a tool changing apparatus for transferring tool holders between their respective magazine position and their working position in said tool receptacle,
• an internal cooling system with a coolant supply to deliver coolant from said coolant supply through said internal duct to a tool holder when clamped into said tool receptacle, in order to supply coolant to a tool holder that is in use, and
• a flushing apparatus connected to the coolant supply and operative to flush a tool holder with coolant while said tool holder is being transferred by said tool changing apparatus,
• wherein the flushing apparatus comprises nozzles, acting predominantly tangentially to the tool holder, to flush in controlled fashion the tool holder on its annular surface, and
• the nozzles are arranged on the tool changing apparatus.

A machine tool, comprising

• a spindle having a tool receptacle for receiving tool holders, and an internal duct running longitudinally through said spindle to said tool receptacle,
• a tool changing apparatus for transferring tool holders between their respective magazine position and their working position in said tool receptacle,
• an internal cooling system with a coolant supply to deliver coolant from said coolant supply through said internal duct to a tool holder when clamped into said tool receptacle, in order to supply coolant to a tool holder that is in use, and
• a flushing apparatus connected to the coolant supply and operative to flush a tool holder with coolant while said tool holder is being transferred by said tool changing apparatus,
• wherein the flushing apparatus comprises nozzles, acting predominantly tangentially to the tool holder, to flush in controlled fashion the tool holder on its annular surface, and
• the nozzles are configured on pilot pins for gripper hands provided at said tool changing apparatus for receiving and holding tool holders.

A machine tool, comprising

• a spindle having a tool receptacle for receiving tool holders, and an internal duct running longitudinally through said spindle to said tool receptacle,
• a tool changing apparatus for transferring tool holders between their respective magazine position and their working position in said tool receptacle,
• an internal cooling system with a coolant supply to deliver coolant from said coolant supply through said internal duct to a tool holder when clamped into said tool receptacle, in order to supply coolant to a tool holder that is in use, and
• a flushing apparatus connected to the coolant supply and operative to flush a tool holder with coolant while said tool holder is being transferred by said tool changing apparatus,
• wherein at least one flushing duct, whose at least one outlet opening is arranged in the region of the tool receptacle, branches off from the internal duct,
• there is provided in the spindle, for automatic clamping in of tool holders, a clamping apparatus which comprises a clamping bar, arranged in longitudinally displaceable fashion coaxially with the spindle in an internal bore, through which the internal duct passes in the longitudinal direction and which comes into engagement with a coolant tube of a tool holder when the latter is clamped in, so that it is supplied with coolant through the internal duct, and
• there is provided in the clamping bar at least one transverse bore which opens into the internal duct and coacts with a transfer space, provided in the spindle and open toward the internal bore, into which the flushing duct opens.