A damping apparatus is provided for damping vibrations of a tool-holding apparatus during machining of a workpiece. The damping apparatus comprises a damping body having two ends on which a respective damping device is arranged, which comprises a bearing pin rigidly connected to the damping body and a bearing bush that surrounds the bearing pin in the circumferential direction. An annular space filled with a damping fluid is arranged between the bearing pin and the bearing bush, which annular space is sealed in the axial direction by two elastically deformable sealing rings. The two sealing rings each comprise first and second abutment regions as well as a resilient intermediate region arranged therebetween. The first abutment region is bonded to the bearing pin and the second abutment region is bonded to the bearing bush. The intermediate region is elastically deformable relative to the bearing pin and the bearing bush.

A receptacle for a rotating tool includes a rotationally symmetrical, hollow-cylindrical receptacle main body. A through-pipe, which is braced in particular in relation to the receptacle main body, is disposed in a cavity of the receptacle main body so as to be spaced apart from a cylinder barrel of the hollow-cylindrical receptacle main body.

A machine tool having a tool holder for exchangeably holding a tool is provided, the machine tool including: a machine tool housing; a spindle rotatably mounted in the machine tool housing a drive end being connected to a drive for rotating the spindle about an axis of rotation and a holding end being coupled to the tool holder; and a locking device arranged in the machine tool housing and which has a locking element reversibly movable between a release position and a locking position, a locking end of the locking element having an interlocking connector and the spindle having a mating interlocking connector, the interlocking connector being disengaged from the mating interlocking connector in the release position to enable rotational motion of the spindle, and the interlocking connector being engaged with the mating interlocking connector in the locking position to prevent rotational motion of the spindle and to enable an exchange of the tool of the tool holder, the locking device also including an electrically insulating mounting device for mounting the locking element in the machine tool housing to electrically insulate the locking element from the machine tool housing.

A machine tool having a tool holder for exchangeably holding a tool is provided, the machine tool including: a machine tool housing; a spindle rotatably mounted in the machine tool housing a drive end being connected to a drive for rotating the spindle about an axis of rotation and a holding end being coupled to the tool holder; and a locking device arranged in the machine tool housing and which has a locking element reversibly movable between a release position and a locking position, a locking end of the locking element having an interlocking connector and the spindle having a mating interlocking connector, the interlocking connector being disengaged from the mating interlocking connector in the release position to enable rotational motion of the spindle, and the interlocking connector being engaged with the mating interlocking connector in the locking position to prevent rotational motion of the spindle and to enable an exchange of the tool of the tool holder, the locking device also including an electrically insulating mounting device for mounting the locking element in the machine tool housing to electrically insulate the locking element from the machine tool housing.

A tool holder (1) includes a clamping member (4) for clamping and holding a tool (5), a holder body (2) having, at a leading end thereof, a receiving portion (25) for receiving the clamping member (4) along an axis (AX) and an operational member (N) for attaching the clamping member (4) to the holder body (2). The clamping member (4) clamps the tool (5) by an operation of the operational member (N). Vibration is applied to a contact portion (T) between the clamping member (4) and the holder body (2) when the clamping member (4) clamps the tool (5).

A tool holder (1) includes a clamping member (4) for clamping and holding a tool (5), a holder body (2) having, at a leading end thereof, a receiving portion (25) for receiving the clamping member (4) along an axis (AX) and an operational member (N) for attaching the clamping member (4) to the holder body (2). The clamping member (4) clamps the tool (5) by an operation of the operational member (N). Vibration is applied to a contact portion (T) between the clamping member (4) and the holder body (2) when the clamping member (4) clamps the tool (5).

The present disclosure provides a spindle structure including a base, a spindle, a sliding member, a restoring mechanism, and a restriction member. The spindle is rotatably received in the base and forms a receiving room. An end of the receiving room is a blind end communicating exterior via a gas channel. The sliding member is slidably received in the receiving room, and two ends thereof are a piston and a driving portion respectively. A gas cavity is defined between the piston and the blind end. The sliding member tends to move toward the blind end due to the restoring mechanism. The restriction member is connected to the driving portion and radially deforms when the sliding member slides so as to fix or to release the tool-holder. The sliding member slides outward when the gas cavity is injected with gas via the gas channel.

A spindle device is mountable with a tool holder, and includes a rotating spindle rotatably mounted to a spindle main body and extending axially to have an axial end surface. A contactless power transmission module is disposed on a flange end surface of the spindle main body and an outer peripheral wall of the rotating spindle for supplying power. An electrically connecting module includes two conductive units each disposed in the rotating spindle and electrically connected with the power transmission module. Each conductive unit has an electrically conductive post extending axially and exposed from the axial end surface for conducting the power to the tool holder.

A spindle device is mountable with a tool holder, and includes a rotating spindle rotatably mounted to a spindle main body and extending axially to have an axial end surface. A contactless power transmission module is disposed on a flange end surface of the spindle main body and an outer peripheral wall of the rotating spindle for supplying power. An electrically connecting module includes two conductive units each disposed in the rotating spindle and electrically connected with the power transmission module. Each conductive unit has an electrically conductive post extending axially and exposed from the axial end surface for conducting the power to the tool holder.

Provided is a machine tool that makes it possible to prevent a reduction in accuracy of a lathe turning process. The machine tool holds a lathe turning tool by means of a tool holder attached to a main shaft and processes a workpiece placed on a rotating table with the lathe turning tool. The machine tool is provided with a fixing member (a gripping member, a pin, a plate) that comes into contact with the main shaft or the tool holder to inhibit rotation of the main shaft and the tool holder.