A gear-grinding multilayer grindstone includes: a first thread-shaped grindstone and a second thread-shaped grindstone that are fixed to each other, such that the first and second thread-shaped grindstones have a rotational axis that is common to the first and second thread-shaped grindstones; and a thread-shaped groove that is provided in a first outer circumferential surface of the first thread-shaped grindstone and a second outer circumferential surface of the second thread-shaped grindstone. The thread-shaped groove extends continuously over the first outer circumferential surface and the second outer circumferential surface. The second thread-shaped grindstone is constituted by abrasive cloths that are laminated on each other, and has a higher elasticity than the first thread-shaped grindstone.

A gear-grinding multilayer grindstone includes a rough machining portion and a finish machining portion that are disposed adjacent to each other on a rotational axis. The rough machining portion includes a first core and a rough machining grindstone that is held on the first core. The finish machining portion includes a second core that is adjacent to the first core, and a finish machining grindstone that is held on the second core. The first core and the second core are fixed to each other, without the rough machining grindstone and the finish machining grindstone being fixed at least at outer peripheral portions thereof to each other.

A method for hard fine machining of the toothing of a gear that has an axis of rotation, wherein the toothing is machined with a hard fine machining tool. The machining tool rotates around an axis of rotation during hard fine machining. The method includes: a) Providing a hard fine machining tool that has axially adjacent machining zones, including a first zone for the grinding the toothing and a second zone for fine grinding and/or polishing the toothing; b) Grinding the toothing with the first zone, wherein a first pivoting angle exists between the axis of rotation of the gear and the axis of rotation of the machining tool; c) Fine grinding and/or polishing the toothing with the second zone of the machining tool, wherein a second pivoting angle exists, which is different from the first pivoting angle, between the axis of rotation of the gear and the axis of rotation of the machining tool.

A tool for generating tooth systems by grinding when the maximum tool diameter is limited by collision contours on the workpiece has a dressable grinding tool that is tightly connected to the tool holder. In one preferred arrangement, the dressable grinding tool is glued on the tool holder.

The invention relates to a method for machining a toothing that is chamfered on a tooth head front edge, in which a material projection resulting on said tooth head front edge chamfer, caused by chamfer formation on a tooth front edge of the toothing by means of plastic deformation, and/or caused by removing a primary/secondary burr produced on said end face during production of the toothing and, if applicable, formation of the tooth front edge chamfer, is removed in a rotational operation by a machining procedure with a machining tool that has a cutting edge.

The invention makes a tool available, which allows highly precise, simultaneous production of two back-tapers on the tooth flanks of the teeth of a workpiece in the form of a gearwheel, independent of their width. For this purpose, the invention provides that the tool includes a tool carrier configured in elongated manner, in the manner of a journal, and oriented coaxial to its central longitudinal axis of the tool, and includes at least two blades, which come into engagement with the tooth to be machined, in each instance, removing chips during use, wherein the blades are held on the tool carrier at a distance from one another in the longitudinal direction of the tool carrier and extend over a partial length of the tool carrier, in each instance, in terms of their width. According to the invention, in this regard the position of at least one of the blades is adjustable in relation to the other blade, so as to balance out deformations of the tool carrier that occur during use. The invention also states a method for simultaneous production of at least two back-tapers on the teeth of a workpiece in the form of a gearwheel, by means of a tool according to the invention.

The invention relates to a method for generating a workpiece (3) having a second tooth system (2) incorporated into a first tooth system (1) having a specified tooth system geometry, wherein a first generative processing engagement, intersecting the second tooth system in the kinematics of the generating skiving, is made on the workpiece, which is in particular oversized in relation to the specified tooth system geometry, in particular on a transition from the first to the second tooth system, and then a second processing engagement, matching the specified tooth system geometry, in the kinematics of the generating skiving is carried out on the transition and a remaining oversize is in particular removed while doing so. The invention further relates to tools and to tooth-cutting machines suitable therefor.

The invention relates to a method for producing a removal of material on a tooth end edge of a workpiece toothing with a rotationally driven chamfering tool in a machining operation brought about by controlled axial machine movements between the chamfering tool and the likewise rotationally driven workpiece toothing, wherein material is removed with a geometrically undefined cutting edge and the removal takes place in a coordinated action between a profiling, in particular, an alterable profiling, of the chamfering tool and a machine control used for the machining operation, performed in dependence on predetermined parameters that are characteristic of the removal of material to be produced.

The invention relates to a method for machining the tip circle diameter of a tooth system (4) of a gearwheel (6), in which the gearwheel (6) rotates about a workpiece axis of rotation (Rw), and in which at least one tooth (9) of the tooth system (4) is machined, by removing chips, by means of a tool (7, 7′) that rotates about a tool axis of rotation (Rz) oriented at an axial distance (A′, A″) relative to the workpiece axis of rotation (Rw). According to the invention, the tool (7, 7′) is disk-shaped, the disk-shaped tool (7, 7′) machines the tip surface (8) of the tooth (9), by removing chips, with at least one partial segment (10a) of its circumferential edge configured as a defined blade (10), wherein a relative movement between the tool (7, 7′) and the gearwheel (6), oriented in the axial direction of the tooth system (4), is carried out during the chip-removing machining, as a consequence of which movement the tool (7, 7′) sweeps over the tip surface (8), and the tool axis of rotation (Rz) is oriented at an axis intersection angle (Σ″) of 5° to 40° with respect to the workpiece axis of rotation (Rw). In this way, efficient and highly precise machining of the tip circle diameter is made possible. The invention also states a method for producing a gearwheel, in which the tooth system (4) is produced on a gearwheel blank (5) by means of hob peeling before machining of the tip circle diameter according to the invention, as well as a combination tool, in which a hob-peeling wheel for producing the gearwheel and a disk-shaped tool for machining the tip circle diameter according to the invention are combined with each other.

A method for hard finishing two different toothings on a workpiece, wherein, prior to each machining process, to set the correct tool engagement position for the machining process, a first relative rotational angle position of a first rotational position reference of the first toothing is determined relative to an axial rotational position of the workpiece spindle holding and clamping the workpiece for the first machining, and a second relative rotational angle position of a second rotational position reference of the second toothing is determined relative to an axial rotational position of a workpiece spindle holding and clamping the workpiece for the second machining, wherein the machining operations are carried out on the same workpiece spindle with no intervening clamping change, and with the first and second rotational position references coupled to each other as the basis thereof.