A device for clamping a workpiece comprises a chuck body and a drive fastened thereto, and at least one clamping jaw, which is coupled to the drive in a driveable arrangement either directly or via intermediate elements and which is or are held movably in or on the chuck body in the direction of the workpiece. This is achieved by providing a free space between the chuck body and a clamping jaw carrier accommodating the clamping jaw, in that an elastically deformable sleeve is inserted in the free space, which sleeve rests on the outside of the chuck body at two positions spaced apart from one another, and in that a pressure chamber is created between the chuck body, the sleeve, and the two support positions into which a medium can be filled, whereby to bulge the latter in the direction of the clamping jaw carrier between the support positions.

A method of determining pull-out of a cutting tool mounted in a rotatable tool holder includes the steps of rotating the tool holder and thus the cutting tool, machining a work piece with the rotating cutting tool, measuring an axial position of the cutting tool in the tool holder during machining by a position sensor in the tool holder, calculating an axial displacement from an initial position of the cutting tool by the measured axial position, and determining pull-out of the cutting tool when the axial displacement exceeds a threshold value. A rotatable tool holder for a cutting tool, a machine tool system including a rotatable tool holder and use of the tool holder and machine tool system is also provided.

A device for hydraulically clamping tools or workpieces, a tool holder or workpiece holder for short, has a clamping portion for clamping a tool or workpiece. An interior of the clamping portion has a plurality of chambers which are connected in fluidic communication by way of a channel system. In order to be able to change, in particular increase, the dynamic rigidity of the hydraulically clampable tool/workpiece holder, a central throttle point is arranged in the channel system. The central throttle point has an adjustment element with which a flow cross section in the central throttle point can be changed.

A counter bearing for machining spindles of machine tools has at least one expansion bushing with an elastically deformable wall that delimits at least one pressure chamber. The pressure chamber accommodates a pressure medium. A supply line for the pressure medium opens into the pressure chamber. A pressure conduit opens into the pressure chamber. A mechanically actuatable pressure element is disposed in the pressure conduit and actuated by an actuating tool. A piston is slidably arranged in the pressure conduit and actuated by the pressure element, wherein the piston loads the pressure medium.

A work support and method of clamping a translatable component of a hydraulic work support system. The work support may include a rigid, hollow slotted collet, a sleeve, and the translatable component, such as a plunger or rod. Hydraulic fluid may be pumped into an inlet of the hydraulic work support system to hydraulically actuate the translatable component outward from a first retracted position to a second extended position. The hydraulic fluid may further be pumped to the sleeve at a sufficient pressure that the sleeve presses against the collet. The collet responds thereto by flexing into contact with the translatable component, thus holding the translatable component in the second extended position. The slots in the collet allow for flexure even when using a thicker material with stronger column strength.

A tool holder used in a machine having a spindle is provided with a connector including a truncated conic part received in the spindle, and a projection extending out of the truncated conic part; a tool mounting member including an axial hole for fastening a tool and a portion of a chuck, and a receptacle for complimentarily receiving the projection; and at least one sleeve formed of a material having a high rigidity, each sleeve including a cavity at one end, the cavity being configured to complimentarily receive the projection, and a protrusion at the other end, the protrusion being configured to complimentarily attach to the receptacle. The connector, the at least one sleeve, and the tool mounting member are secured together.

Expansion sleeves are disclosed comprising a body and a flange. The body may be generally cylindrical and includes an inner wall, an outer wall integrally formed with the inner wall, and a pressurized fluid chamber located radially between and encapsulated in the inner wall and the outer wall. The front flange extends radially outward from the outer wall of the body. The front flange may comprise a tool support connection structured and arranged to fasten the front flange to a tool support member. The tool support member may include a pressurized fluid system that communicates with the pressurized fluid chamber of the expansion sleeve. The expansion sleeves may be secured to the tool support member by mechanical fasteners, threading, or combinations thereof. During operation, pressurized fluid in the tool support member communicates with the pressurized fluid chamber of the expansion sleeve to clamp a tool shank.

The invention relates to an expansion clamping sleeve (6) comprising a sleeve body (30) having a tool receptacle (24) for a chipping tool, wherein the sleeve body (30) is expanded in a longitudinal direction (10) as well as in a radial direction (20) transverse to the longitudinal direction (10), wherein the sleeve body (30) comprises a pressure membrane (44) delimiting a hydraulic chamber (40) in the sleeve body (30), and wherein the sleeve body (30) comprises a receptacle (46) for a mechanical actuator (48) for activating the pressure membrane (44). In addition, the invention relates to a hydraulic expansion clamping chuck (2) having such an expansion clamping sleeve (6).

A chuck device that allows easy attachment of a clamping target component and can provide powerful and highly reliable clamping includes a main body including a metal core part and an annular space coaxial with and formed around the metal core part; a rubber elastic body fitted in the annular space of the main body such that there is a pressure chamber between a circumferential wall that defines the annular space and the rubber elastic body, and a clearance for allowing a tubular clamping target component to be inserted between the rubber elastic body and the metal core part; and a passage for introducing a fluid to the pressure chamber, wherein the rubber elastic body is deformed to expand toward the metal core part by a pressure of a fluid introduced to the pressure chamber via the passage so that a tubular clamping target component that is attached to the metal core part is clamped by the metal core part and the rubber elastic body that has deformed to expand.

A device (1) for clamping a workpiece (2) to be machined, in particular a chuck or vice, the device comprising: (i) a chuck body (3) and a drive (5) fastened thereto, and (ii) at least one clamping jaw (6), which is coupled to the drive (5) in a driveable arrangement either directly or via intermediate elements (7) and which is or are held movably in or on the chuck body (3) in the direction of the workpiece (2). On the one hand, reliable and centric clamping of the workpiece (2) in a predetermined position is achieved and, on the other hand, the mounting of the clamping jaw carrier (9) on the chuck body (3) is free of backlash in the clamped condition in order to prevent any possibility of movement of the workpiece (2) relative to the chuck body (3). This is achieved by providing a free space (11) between the chuck body (3) and a clamping jaw carrier (9) accommodating the respective clamping jaw (6), in that an elastically deformable sleeve (12) is inserted in the free space (11), which sleeve (12) rests on the outside (8) of the chuck body (3) at two positions (21) spaced apart from one another, and in that a pressure chamber (14) is created between the chuck body (3), the sleeve (12) and the two support positions (21) thereof, into which pressure chamber (14) a medium (16) can be filled, by means of which a pressure force directed outwards acts on the wall (W2) of the sleeve (12) and bulges the latter in the direction of the clamping jaw carrier (9) between the support positions (21).