The invention relates to a machine for the precision machining of toothed workpieces, which machine comprises a tool spindle (30) for mounting a precision machining tool (31). The tool spindle can be driven to rotate about a tool spindle axis (B) by means of a tool spindle drive (32). A control device (70) takes at least one measurement of the distance from the precision machining tool (31) by means of a distance sensor (60) and, on the basis of said measurement(s), determines at least one characteristic variable of the precision machining tool, in particular the outer diameter thereof. The distance sensor can operate optically in particular.

A system and method for machining a workpiece to provide a toothed member having a desired tooth pattern. A cutting tool machines the workpiece to a first depth, thereby forming a semi-finished tooth pattern, the first depth less than a full depth to which the workpiece is to be machined to provide the desired tooth pattern. Dimensions of the semi-finished tooth pattern are acquired and compared to nominal dimensions. If the acquired dimensions are not within a tolerance of the nominal dimensions, the geometry of the cutting tool is modified for correcting deviations of the acquired dimensions from tolerance and the workpiece further machined by the modified cutting tool. Once the dimensions of the semi-finished tooth pattern are within tolerance, the workpiece is machined to the full depth for providing the desired tooth pattern.

This dressing device has: a gear grinding tool spindle (7) that rotatably supports a screw-shaped grindstone (10); and a dressing tool (30) that dresses the screw-shaped grindstone (10). The dressing device dresses the screw-shaped grindstone (10) by driving the screw-shaped grindstone (10) to rotate, and causing the relative motion of the screw-shaped grindstone (10) and/or the dressing tool (30). The dressing device performs a dressing process on the screw-shaped grindstone (10) in a manner such that the pressure angle changes along the direction of the tooth line by means of moving the screw-shaped whetstone (10) and/or dressing tool (30) at a fixed speed and altering the speed of rotation of the screw-shaped grindstone (10), or rotating the screw-shaped grindstone (10) at a fixed speed and altering the speed of motion in the axial direction of the screw-shaped grindstone (10) and/or the dressing tool (30).

A method for machining toothed and hardened work wheels, includes: mounting a work wheel that is hardened and pre-toothed with an allowance onto a workpiece spindle; removing at least 50% of the allowance by means of gear skiving with a skiving wheel that is rotatably driven by a tool spindle; precision-machining the work wheel in unchanged tension by means of a honing wheel. The forward movement occurs during gear skiving in the extension direction of the toothing. The delivery of the workpiece that is moved in an oscillating manner in the extension direction of the toothing occurs during honing in the radial direction. The skiving wheel and the honing wheel are driven by a common tool spindle. A device for carrying out the method includes a workpiece spindle, which is driven to rotate, and a tool spindle, which carries a combination tool having a skiving wheel and a honing wheel.

The present invention shows a process for gear manufacturing machining a workpiece by a tool on a gear manufacturing machine, wherein the workpiece is machined by a generating machining process in which the tool for gear manufacturing machining rolls off on the workpiece at a predefined center distance and axial cross angle, wherein the gear manufacturing machining preferably takes place on two flanks, with a desired tooth trace shape and/or tooth thickness of the gearing being generated by the generating machining process. The process is characterized in that an additional condition is predefinable and in that the center distance and the axial cross angle are determined in dependence on the desired tooth trace shape and/or tooth thickness of the gearing and on the additional condition.

A method for continuous generating grinding of at least two gear workpieces with a topologically modified grinding worm comprising a topologically modified worm region to grind tooth flanks which are topologically modified on the gear workpieces, wherein the method comprises at least the following steps: a) providing a first gear workpiece, b) performing a topological generating grinding operation by carrying out relative movements between the first gear workpiece and the grinding worm, which comprises a relative feed movement, a relative axial feed which occurs parallel or obliquely to the tool rotation axis, and a relative shift movement, c) providing the second gear workpiece, d) performing a relative jumping motion extending substantially parallel or obliquely to the tool rotation axis between the second gear workpiece and the grinding worm, e) repeating step b) for the second gear workpiece.

A method which is executed in a grinding machine comprising a) rotationally driving a cup grinding wheel around an axis of rotation of a tool spindle at a first speed, b) rotationally driving a dressing tool around an axis of rotation of a dressing spindle at a second speed, c) carrying out a dressing method using the dressing tool, wherein a predetermined, fixed speed ratio is specified between the first speed and the second speed, and after steps (a), (b), and (c): i. eccentrically rotationally driving the cup grinding wheel around the axis of rotation of the tool spindle at a first machining speed using the eccentric drive, ii. carrying out a grinding method, wherein the bevel gear workpiece is machined by grinding using the cup grinding wheel.

Method for the grinding of a gear wheel workpiece using a dressable worm grinding wheel, wherein the worm grinding wheel is rotationally driven about a tool axis of rotation and the gear wheel workpiece is rotationally driven about a workpiece axis of rotation, and relative movements are executed between the worm grinding wheel and gear wheel workpiece, and wherein after the execution of a dressing procedure of the worm grinding wheel, which is carried out by means of a rotationally-drivable dressing unit, the following steps are carried out: executing a relative shift movement between the worm grinding wheel and gear wheel workpiece parallel to the tool axis of rotation, executing an axially-parallel relative movement between the worm grinding wheel and gear wheel workpiece in parallel or diagonally to the workpiece axis of rotation,
wherein a ratio between the shift movement and axially-parallel relative movement is specified, which is variable.

A method for the dressing of a multi-thread grinding worm by a dressing roll, wherein the grinding worm has at least two screw channels which are arranged parallel to another, which screw channels extend helically around an axis of the grinding worm and wherein the dressing roll has at least two adjacent dressing profiles which are arranged along an axis of the dressing roll, wherein the dressing profiles of the dressing roll are guided simultaneously through adjacent screw channels of the grinding worm during the dressing of the grinding worm. To improve the precision of the dressing the method includes the steps: a) Execution of a first partial dressing process at which the dressing profiles of the dressing roll are guided simultaneously through first adjacent screw channels of the grinding worm; b) Execution of at least one second partial dressing process at which the dressing profiles of the dressing roll are guided simultaneously through second adjacent screw channels of the grinding worm, wherein the second adjacent screw channels are, compared with step a), offset in the direction of the axis of the grinding worm by at least one screw channel of the grinding worm.

A tool which can be used for gear manufacturing machining of a workpiece may be dressed on a dressing machine, and the dressing may take place with line contact between the dresser and the tool. A specific modification of the surface geometry of the tool is produced by the suitable selection of the position of the dresser with respect to the tool during dressing. The specific modification of the surface geometry of the workpiece is specifiable with regard to various parameters.