The invention relates to a tool for dressing or cutting teeth of fine machining tools, which tool makes it possible to exactly reproduce, in a simple manner, the required tooth system geometry on the fine machining tool which is to be dressed or in which teeth are to be cut. The tool is annular and has a set of internal teeth, the teeth of which mesh, during the tooth-cutting or dressing operation, with the set of external teeth of the fine machining tool in which teeth are to be cut or which is to be dressed. At the same time, the tool has a central longitudinal axis, which extends through the centre point of the opening surrounded by the tool. According to the invention, the set of internal teeth is now formed on a ring element, which is at most 5 mm thick and is produced from a diamond material. The teeth of the set of internal teeth have cutting edges, by means of which said teeth remove material of the fine tool during the tooth-cutting or dressing machining process. The ring element is supported by a support ring, on which at least one support element associated with the support ring opening of the support ring is provided. The ring element is supported on said support element. The teeth of the set of internal teeth formed on the ring element protrude beyond the edge of the support element facing the support ring opening at least over part of the length of the cutting edges of said teeth in the direction of the central longitudinal axis of the tool.

The invention relates to a tool for dressing or cutting teeth of fine machining tools, which tool makes it possible to exactly reproduce, in a simple manner, the required tooth system geometry on the fine machining tool which is to be dressed or in which teeth are to be cut. The tool is annular and has a set of internal teeth, the teeth of which mesh, during the tooth-cutting or dressing operation, with the set of external teeth of the fine machining tool in which teeth are to be cut or which is to be dressed. At the same time, the tool has a central longitudinal axis, which extends through the centre point of the opening surrounded by the tool. According to the invention, the set of internal teeth is now formed on a ring element, which is at most 5 mm thick and is produced from a diamond material. The teeth of the set of internal teeth have cutting edges, by means of which said teeth remove material of the fine tool during the tooth-cutting or dressing machining process. The ring element is supported by a support ring, on which at least one support element associated with the support ring opening of the support ring is provided. The ring element is supported on said support element. The teeth of the set of internal teeth formed on the ring element protrude beyond the edge of the support element facing the support ring opening at least over part of the length of the cutting edges of said teeth in the direction of the central longitudinal axis of the tool.

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 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 machine tool comprises first and second support arms, and a rigid structure which couples the first support arm to the second support arm. A first rotary drive is operable to rotate the first support arm and the rigid structure relative to each other about a first rotational reference axis, and a second rotary drive is operable to rotate the second support arm and the rigid structure relative to each other about a second rotational reference axis, wherein the first and second rotational reference axes are parallel and spaced apart by a fixed distance. A control arrangement is configured to control the first and second rotary drives such that a workpiece mount carried by the second support arm follows a predetermined path relative to a tool mount carried by the first support arm in a plane perpendicular to the rotational reference axes.

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.

A continuous-generation gear grinding method of conducting a gear grinding process such that while a thread-shaped grinding wheel is rotated around an axial center thereof and fed in an axial center direction, a position coming into contact with abrasive grains is constantly changed in the presence of a water-soluble grinding fluid by performing a grinding feed in a direction parallel to an axial center of a gear blank and by serially rotating the gear blank around the axial center, the grinding wheel being a vitrified grinding wheel having abrasive grains bonded by a vitrified bond with pores formed among the abrasive grains, and the abrasive grains having a grain size of F120 to F180.

A continuous-generation gear grinding method of conducting a gear grinding process such that while a thread-shaped grinding wheel is rotated around an axial center thereof and fed in an axial center direction, a position coming into contact with abrasive grains is constantly changed in the presence of a water-soluble grinding fluid by performing a grinding feed in a direction parallel to an axial center of a gear blank and by serially rotating the gear blank around the axial center, the grinding wheel being a vitrified grinding wheel having abrasive grains bonded by a vitrified bond with pores formed among the abrasive grains, and the abrasive grains having a grain size of F120 to F180.

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.

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.