Mass damper device comprising a tubular housing having a first and a second longitudinal end; at least one damping mass which is received in the tubular housing with a circumferential clearance; a first resilient element and a second resilient element. At least one end closure is arranged at the first or second longitudinal end. The housing and the end closure have cooperating mounting surfaces which define a longitudinal mounting position of the first and second end closures. The mounting surfaces are arranged such that the first and second resilient elements are compressed between the damping mass and the end closure, when the first and second end closures have been mounted, at the longitudinal mounting position, to the housing.

A rotary cutting tool includes a tool body including a chip flute portion having a plurality of helical chip flutes separated by lobes. In one aspect, a tunable vibration absorber assembly is disposed within a cavity formed in the chip flute portion. In another aspect, the tunable vibration absorber assembly is disposed within a cavity of a replaceable cutting head. In each aspect, the tunable vibration absorber assembly includes one or more tunable absorber masses, a resilient material between the one or more absorber masses and the cavity, and one or more connecting members for preventing relative angular displacement of the one or more tunable absorber masses. The one or more tunable absorber masses are suspended only by the resilient material, thereby enabling the tunable vibration absorber assembly to be tuned to a desired frequency for suppressing torsional vibration of the rotary cutting tool during a cutting operation.

A cutting apparatus includes a cutting tool having a cutting edge, an excitation part structured to apply excitation to the cutting tool, and a drive part structured to apply a voltage to the excitation part to reciprocate the cutting edge of the cutting tool. The excitation part suppresses residual oscillations by applying excitation that contains an excitation force of components of frequencies higher than a resonance frequency and has an excitation force of the resonance frequency suppressed. The excitation part applies a first excitation, and applies a second excitation after an elapse of a time 0.5 times as long as a resonance period from timing at which the first excitation is applied to suppress residual resonance oscillations.

The invention relates to a cutting machine with a receiving area for a tube section and with a tool head (1) which can be rotated relative to the receiving area about a longitudinal axis (L), has at least one cutting tool (6) for machining a tube section end (40) of the tube section located in the receiving area, and has a support component (2), wherein the support component faces the receiving area and has an annular component (3) which rotates relative to the support component (2) about the longitudinal axis (L) and is designed to be randomly supported on a tube wall (42, 42) of the tube section end (40). The invention further relates to a corresponding method for reducing vibrations.

The invention relates to a tool holder (2) for connecting a machining tool (4) having a depth-control stop (3) to a working spindle of a machine tool, having a spindle-side shaft part (6) and a receiving part (7) which supports the machining tool (4) and is connected in a rotationally fixed manner to the shaft part (6). The receiving part (7) is axially displaceable in the tool feed direction via a compression spring arrangement (21), that is supported on the shaft part (6), counter to a fixed stop (17a) on the shaft part (6) and can be displaced away from the fixed stop (17a) on the shaft part (6) during the impact of the depth stop (3) on a workpiece against the spring force of the compression spring device (21).

A rotary cutting tool includes a tool body including a chip flute portion having a plurality of helical chip flutes separated by lobes. In one aspect, a tunable vibration absorber assembly is disposed within a cavity formed in the chip flute portion. In another aspect, the tunable vibration absorber assembly is disposed within a cavity of a replaceable cutting head. In each aspect, the tunable vibration absorber assembly includes at least two tunable absorber masses, a resilient material between the one or more absorber masses and the cavity, and one or more connecting members for preventing relative angular displacement of the one or more tunable absorber masses. The at least two tunable absorber masses are suspended only by the resilient material, thereby enabling the tunable vibration absorber assembly to be tuned to a desired frequency for suppressing torsional vibration of the rotary cutting tool during a cutting operation.

A collet assembly of improved stability has a collet, an axial limiting assembly, a cutter, a pin, and multiple damping elements. The collet has a containing space, a pin-receiving groove, a connecting groove, and multiple receiving grooves. The containing space is formed through the collet. The pin-receiving groove is formed through the collet. The connecting groove is recessed on the collet. The multiple receiving grooves are recessed in the collet. The axial limiting assembly is mounted to the collet. The cutter has a limiting groove and a mounting end. The limiting groove is recessed on the cutter. The mounting end abuts against the limiting assembly. The pin extends into the pin-receiving groove and abuts against the limiting groove of the cutter. Each one of the multiple damping elements is received in a respective one of the multiple receiving grooves of the collet. A collet of improved stability is also provided.

A rotation mechanism rotates a spindle to which a cutting tool or a workpiece is attached. A rotation controller controls the rotation of the spindle by the rotation mechanism. A feed mechanism moves the cutting tool relative to the workpiece. The rotation controller alternately exercises acceleration control under which the rotation of the spindle is accelerated to make a speed fluctuation ratio between the current cutting speed and a cutting speed one rotation before at the same rotation position equal to or greater than the first value that is greater than 1 and deceleration control under which the rotation of the spindle is decelerated to make the speed fluctuation ratio equal to or less than the second value that is less than 1.

A grooving blade for chip removing machining includes a cutting insert pocket and a damping arrangement fixed to the blade. The damping arrangement projects laterally with respect to at least one major surface of the blade. A grooving tool and a method of grooving a metallic workpiece are also disclosed.

Mass damper for a cutting tool, the mass damper comprising at least one damping mass; and at least one spring element arranged to support the damping mass, wherein the spring element comprises a nanostructure with a structural size of 100 nm or less in at least one dimension. A cutting tool comprising the damping mass is also provided.