Abstract: The invention relates to a hydraulic expanding chuck for gripping a tool, for example a drill or a milling tool, comprising: a clamping part having an expansion sleeve having a central receiving opening for receiving and clamping the tool; and a connection part, in particular having a HSK connection. According to the invention, the expansion sleeve has at least two pressure chambers, which are designed to run around the central receiving opening, which are arranged at an axial distance relative to one another, and which can bulge when the tool received in the central receiving opening is subjected to fluid pressure. The at least two pressure chambers are connected to one another by a fluid channel.

Abstract: The invention relates to a machining tool comprising a substrate surface made of a hard metal or a ceramic material; the substrate surface contains carbide-based and/or nitride-based and/or oxide-based hard particles embedded in a cobalt-containing binder matrix, and the substrate surface contains additional atoms implanted using ion beams of at least one species of cations.

Abstract: A rotary tool for machining workpieces, said tool comprising a base body having a clamping section and a tool head comprising a cutting region having at least one cutting edge. The tool head comprises at least one coolant channel for supplying a cooling and/or lubricating fluid into the cutting region. At least some sections of the coolant channel have a cross-section that tapers in the direction of the tool head. In this region, at least two coolant outlet lines branch off from contact points of the coolant channel in the direction of the tool head upper surface, and are offset in the axial longitudinal direction of the coolant channel. Also, a production method for a rotary tool, in which the blank of the tool is produced by a sintering method in which the coolant channel of the tool is formed integrally in the sintering method at the same time.

Abstract: The present invention relates to a machining tool having a substrate surface made of a hard metal or a ceramic material, said substrate surface containing hard material particles on the basis of carbide and/or nitride and/or oxide that are embedded in a cobalt-containing binder matrix, and the substrate surface being smoothened. The substrate surface of the machining tool can be smoothened by way of a treatment with an ion beam that consists of monomer ions of at least one cation species, the cation species being mono-or poly-charged and being selected from the group consisting of: cations of the main group elements lithium, boron, aluminum, gallium, carbon, silicon, germanium, nitrogen, phosphorus and oxygen; and cations of the transition metals titanium, zirconium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, iron, cobalt, nickel and copper.

Abstract: A cutting element for a tool to create a helically extending, trapezoidally undercut groove in a cylindrical surface of a bore. The cutting tool, preferably configured as a cutting insert, has groove-cutting teeth to create a symmetrically cross-sectioned groove which are arranged in series in a division harmonized with the pitch of the groove to be created. These groove-cutting teeth comprise at least one pre-machining tooth to create and machine a base groove and several trapezoidal teeth following the at least one pre-machining tooth, which have a tooth head profile which expands trapezoidally in cross-section in the vertical direction of the tooth with two flanks delimiting a flank angle for further machining the base groove to a trapezoidally undercut final cross-section. The flank angle delimited by the two flanks increases from at least one trapezoidal tooth to a following trapezoidal tooth to a defined final dimension.

Abstract: Described is an end mill with four straight front cutting edges arranged on a front side and a corresponding number of circumferential cutting edges that each emanate from the outer nose of the front cutting edges and are separated from each other by flutes. One of the front cutting edges passes over into a second cutting edge via a free surface intersecting line. The additional front cutting edges lying between the latter in the cutting direction are offset relative to each other by a first angular pitch of 180°, and end before the middle.

Abstract: A machining tool for deburring boreholes, which lead laterally into a recess, comprising: a shaft; a cutting head with at least one circumferential cutting blade associated with a chip groove and having a cutting edge extending, at least in sections, in an axial direction, and which can perform a cutting process by virtue of relative movement between the tool and a workpiece, and which lies on a virtual cylindrical rotation surface; and at least one cutting-blade-free and chip-groove-free surface area; at least one fluid channel closed on the cutting head side, extending through the shaft into the cutting head; and at least one branch channel with an outlet opening. The outlet opening is in a dynamic pressure active surface radially set back relative to the virtual rotation surface, and is larger than a flow cross-sectional area of the at least one branch channel at the outlet opening.

Abstract: For producing a cylindrical surface that has a surface structure of predetermined geometry suitable for application of material by thermal spraying, a geometrically predetermined groove structure of minimal depth and width is introduced into the surface by a tool embodied as a follow-on tool in that a groove cross-section is processed successively to a final size. In order for the surface to be producible in mass production with constant quality, the groove structure is worked in such that first a base groove is introduced with a groove bottom width that is smaller than the groove bottom width of the finished groove. Subsequently, at least one flank of the base groove is processed for producing an undercut groove profile by a non-cutting action or cutting action wherein the introduced groove structure is deformed in such a way that the groove openings are constricted by upsetting deformations of material.

Abstract: A multi-lip drilling tool is described, in which main cutting edge transitions in the region of the drill into a center lip section, wherein a cooling duct that leads to the drill tip is formed in each drill web. The invention minimizes tensile stress spikes in the chip flute base, while at the same time ensuring that a hitherto unachievable coolant/lubricant quantity gets to the engaged main blade. This is ensured by selecting a duct cross sectional form similar to an unsymmetrical kidney, in which it is ensured the selected radii of curvature for the individual boundary curve sections causes as much coolant/lubricant as possible to arrive at the blade or in proximity thereto in the fastest way via the point thinning and its edges intersecting with drill core.

Abstract: A method for mechanically roughening a cylindrical surface of a workpiece, e.g. the piston-bearing surface of a cylinder sleeve in a cylinder crankcase, by producing a defined microstructure of mutually crossing grooves, and by a groove forming tool, operating with or without material removal. A method in which in a first operation, a groove-forming tool is moved axially along the workpiece surface in such a way that at least one axial groove is machined into the workpiece surface; and in a second operation, following the first operation, the groove forming tool is rotated about the cylinder axis by a predefined rotational angle in the axial position reached in the first operation, whereby at least one circumferential groove crossing the axial groove is machined into the workpiece surface; and in a third operation following the second operation, the groove-forming tool is drawn back axially along the workpiece surface.

Abstract: A rotary tool for machining workpieces, comprising at least one main body with a clamping segment, a tool head comprising a cutting region, and at least one coolant channel for feeding a cooling and lubricating fluid into the cutting region. At least one partial surface section of the cutting region forms a hardened region, which covers and/or defines the coolant channel and is surface-hardened. A method for producing a rotary tool.

Abstract: A chuck for a power tool has a central receptacle, arranged in the body of the chuck, having a locating opening for axially inserting a shank-type tool. A reducing sleeve is arranged at least partly in the central receptacle, and a clamping device is provided for at least locally reducing the cross section of the central receptacle. A fixing device is provided which specifies a defined arrangement of the reducing sleeve in relation to the locating opening both with the chuck clamped and with the chuck unclamped.

Abstract: The invention therefore provides a tool holder for tools supplied with coolant or lubricant, especially rotating tools such as boring or milling tools, with an internal duct system for passing coolant or lubricant to the shank of the tool. To enable particularly flexible use of machine tools, the tool holder is equipped according to the invention with a lubricant reservoir which is integrated into the tool holder and which is preferably fillable and pressurizable, which during operation of the tool can be decoupled from a coolant or lubricant source and supplies the tool controllably with coolant and lubricant via a metering unit.