A clamping unit includes a drawbar having an interior surface defining a fluid transport channel. A fluid transport pipe is at least partially disposed within the interior of the drawbar and is in fluid communication with a fluid transport adapter and a fluid transport channel to enable high pressure fluid to be provided directly to a toolholder. The clamping unit further comprises at least one spring-like member positioned around the outer surface of the drawbar to provide a biasing force against an end plate. The drawbar is movable along a longitudinal axis between a locked position and a tool release position by applying and not applying hydraulic pressure against the end plate, thereby providing a quick-change feature of the invention.

The controller for a machine tool according to the present invention makes it possible to discharge both a coolant and an oil mist from a through hole provided in the tool equipped to a main axis of a machine tool, allows a processing program to instruct the discharge of either the coolant or the oil mist, and carries out such a control that a state where the above-described tool is detached from the main axis is maintained during a predetermined period of time at the time of replacing the tool, and at the same time, the oil mist is discharged from the above-described oil mist unit so as to remove the coolant from the above-described piping during the predetermined period of time.

The invention relates to a tool receptacle 1 comprising a receiving body 3, which has a receiving opening 5 for a tool shaft 6 of a tool and a first fluid supply structure 22, 33 and 35 for supplying fluid to the tool, said fluid supply structure extending through the receiving body 3. In order to allow a diversified supply of working fluids to the tool, a second fluid supply structure 23, 34 and 41, which is not connected with the first fluid supply structure 22, 33 and 35, extends through the receiving body 3, hereby allowing a fluid supply to the tool which is separate from the first fluid supply structure 22, 33 and 35.

A machine tool capable of facilitating a process of mounting a fluid supplying unit to a spindle supporting unit is provided. The machine tool has a rotating unit including a spindle provided with a workpiece chucking unit, a supporting unit which rotatably supports the spindle around a spindle axis, and a fluid supplying unit removably mounted on a rear end of the supporting unit to allow fluid flow inside the spindle toward the chucking unit. The fluid supplying unit has an insert to be received in the rotating unit in the direction of the spindle axis. A labyrinth clearance is formed between the outer circumferential surface of the insert and the inner circumferential surface of the rotating unit when the fluid supplying unit is mounted on the rear end of the supporting unit. The labyrinth clearance allows rotation of the rotating unit and restricts leakage of the supplied fluid from inside the spindle when the rotating unit is rotated.

A tool drive with spindle shaft for a chip-forming machining includes at least one electromagnetic axial actuator and a control and/or regulation apparatus for the operation of the axial actuator for changing the position of the spindle shaft along the longitudinal axis. The control and/or regulation apparatus is designed to drive the axial actuator for the generation of microvibration movement of the spindle shaft, independently of and superimposable on a feed movement, in order to affect the chip size and chip shape of the removed material. At least one axial magnetic bearing and/or one linear motor is provided as at least part of the axial actuator, hi an operating method for an above-mentioned tool drive with a spindle shaft and an axial magnetic bearing is proposed, wherein an adjustable axial microvibration movement of the spindle shaft is superimposed through at least one electromagnetic axial actuator, independently of a feed, in order to influence the chip size and chip shape of the material removed from holes.

A machine tool includes a bed having an arrangement space; a tank capable of being disposed in the arrangement space; a coolant leakage prevention plate pivotable about a shaft extending in a horizontal direction; and a rotary piece pivotable about the shaft together with the coolant leakage prevention plate. The coolant leakage prevention plate is configured to be held at either a closing position or an open position. At the closing position, the coolant leakage prevention plate hangs down from the shaft to cover at least a part of the tank. When the tank is pulled out from the arrangement space, the coolant leakage prevention plate is pushed up by the tank, whereby the coolant leakage prevention plate is caused to be at the open position. When the coolant leakage prevention plate is positioned at the opening position, the rotary piece is held to hang down from the shaft.

A core drill includes a housing, a first handle extending from the housing and defining a gap between the handle and the housing, a motor supported within the housing, and a battery removably coupled to the housing and configured to provide power to the motor. The battery has an output voltage greater than 40 volts. The core drill further includes a spindle configured to rotate about a rotational axis in response to torque received from the motor and a fluid delivery system configured to supply fluid to the spindle. The fluid delivery system includes a valve operable to regulate a flow of fluid to the spindle and an auxiliary handle removably coupleable to the housing at each of a first mounting point and a second mounting point.

This method, for controlling a machine tool using a tool holder to which a coolant pipe is attached, includes: a step of detecting, in response to a signal indicating that a tool is prepared on a tool loading station of the machine tool, whether or not an abnormality has occurred in attaching the coolant pipe to the tool holder of the tool while the tool holder is at the tool loading station; and a step of issuing an alarm when the abnormality is detected in the step of detecting the occurrence of the abnormality.

A clamping unit includes a drawbar having an interior surface defining a fluid transport channel. A fluid transport pipe is at least partially disposed within the interior of the drawbar and is in fluid communication with a fluid transport adapter and a fluid transport channel to enable high pressure fluid to be provided directly to a toolholder. The clamping unit further comprises at least one spring-like member positioned around the outer surface of the drawbar to provide a biasing force against an end plate. The drawbar is movable along a longitudinal axis between a locked position and a tool release position by applying and not applying hydraulic pressure against the end plate, thereby providing a quick-change feature of the invention.

A spindle structure capable of accelerating the flow of a fluid in through holes of a rotor. The spindle structure includes a rotatable rotation part. The rotation part includes a tool holding part provided at an axial direction one end of the rotation part and through holes that penetrate the rotation part and open at the end in the axial direction. Further the spindle structure includes a vane provided in the through holes. When the rotation part rotates, the vane rotates with the rotation part to allow a fluid in the interior of the through holes to flow toward the end in the axial direction.