A gear machining apparatus and a gear machining method are provided. The gear machining apparatus performs cutting work for a workpiece and generates a gear by performing a feed operation of a gear cutter relative to the workpiece along a direction of an axis of the workpiece while synchronously rotating the gear cutter and the workpiece in a state in which an axis of the gear cutter is inclined with respect to a line parallel to the axis of the workpiece. The gear machining apparatus sets a correction angle to a first angle when cutting work for a second tooth flank is started after cutting work for a first tooth flank is finished, and moves the gear cutter from a first finish position to a second start position while rotating the workpiece and the gear cutter.

For the precision machining of a workpiece (10) provided with gearing (11) and rotating about a rotation axis (Dw), teeth (3) of a gear-cutting tool (1) rotating about a rotation axis (Dz) are brought into engagement with teeth (12) of the workpiece (10), and the gear-cutting tool (1) and the workpiece (10) are moved relative to each other in a direction (AX+, AX−) parallel to the rotation axis (Dw). The thickness (dZ) of the teeth (3) of the gear-cutting tool (1) increases in the axial direction, starting from the respective front ends (4, 5) of the teeth, until a thickness maximum (dZmax) is reached. High material removal performances and long-term durability of the gear-cutting tool (1) are achieved in that, according to the invention, 2≤Bw/Bz≤20 applies (wherein Bw=width Bw of the teeth of the gearing (11) of the workpiece (10), Bz=width of the teeth (3) of the gear-cutting tool (1)), that the gear-cutting tool (1), before each pass of its teeth (3) through the tooth gaps (17) of the workpiece (10) in the respective axial directions (AX+, AX−), is positioned at a position (P1, P2) in which the thickness maximum (dZmax) of the teeth (3) of the gear-cutting tool (1) is situated outside the gearing (11) of the workpiece (10), and that as a consequence of the relative movement of the workpiece (10) and of the gear-cutting tool (1) in the axial direction (AX+, AX−), the teeth (3) of the gear-cutting tool (1) are each moved through the respective tooth gaps (17) of the gearing (11) of the workpiece (10) that are assigned to them, until the thickness maximum (dZmax) of each tooth (3) has exited the assigned tooth gap (17).

A shaving processing method and apparatus for a gear are provided which reduce a load at the time of processing a tooth surface, thereby reducing a transmission error of the gear. Embodiments include a method for finishing the tooth surface of the gear in a state where the gear and a shaving cutter are engaged with each other and the shaving cutter is rotated. The gear has a pair of end surfaces facing each other in the tooth width direction. A first shaving step of processing the tooth surface is performed so that a processing region gradually expands from one end surface of the pair of end surfaces toward the other end surface, and a second shaving step of processing the tooth surface is performed so that a processing region gradually expands from the other end surface of the pair of end surfaces toward the one end surface.

The invention relates to a method for machining a toothing (2) having an axis of rotation (C), in which a machining tool (4), which is rotationally driven about its axis of rotation (B), removes material from the toothing while executing a relative motion between the machining tool and toothing to generate a flank geometry of the toothing, which has been predefined over the full width of the toothing, in a machining operation, wherein the predefined flank geometry matches a motion control that defines a motion path of the tool center with respect to the toothing axis of rotation, said motion control having a defined, non-vanishing axial advancement with a defined advancing motion between machining tool and toothing, wherein in a first machining process, the relative motion is only executed for generating a part, more particularly a significant part (5), of the flank geometry according to this motion control, while a further part, more particularly the remaining part (6), of the flank geometry is generated in a second machining process, in which the distance between the tool center and the toothing axis of rotation with respect to the fixed motion path changes in a manner wherein the tool center moves away from the toothing, and in which the change to the machining operation caused thereby is counteracted by an additionally executed change in motion of the relative motion with respect to the motion control of the first machining process.

The present disclosure relates to a method for the gear manufacturing machining of a workpiece in which a hobbing machining of the workpiece takes place to generate a gearing geometry of the workpiece, wherein the workpiece is gear manufacturing machined by gear skiving in addition to the hobbing machining.

A method for cutting teeth into working gears using a tool, the tool main part of which has a plurality of cutting teeth which are arranged about a rotational axis and which protrude radially from the tool main part, the cutting teeth forming an end face, two tooth flanks which point away from each other, and cutting edges. The cutting edges are formed from the tooth flank edges adjoining the end face. In a first method step, tooth gaps which form tooth flanks are produced in the working gear by means of the cutting edges using a machining process in a first position of the tool relative to the working gear, and in a second method step, the working gear tooth flanks produced by the cutting edges are fine-machined by an abrasive tool surface.

A method of manufacturing a gear member formed into a cylindrical shape, the gear member having an internal gear disposed without overlapping the bearing holding portion in an axial direction, the method including: preparing a cylindrical material with a small-diameter cylindrical portion having an inner diameter corresponding to a tooth tip diameter of the internal gear in a tooth width region of the internal gear such that the small-diameter cylindrical portion is extended from the tooth width region toward the one end portion to reach the bearing holding portion; and inserting a skiving cutter from the other end portion side opposite to the one end portion of the cylindrical material to form the internal gear by skiving in the tooth width region of the small diameter cylindrical portion, and terminating the skiving at a halfway position before reaching the bearing holding portion and across the tooth width region.

A tooth groove machining method includes: defining a shift angle as a phase correction angle in skiving when shifting a reference point of a predetermined tooth groove of a workpiece in a circumferential direction of the workpiece; machining a first tooth side surface by the skiving with a gear cutting tool, by setting an intersection angle to a predetermined intersection angle, and by setting the phase correction angle to a first phase correction angle; and machining a second tooth side surface by the skiving with the same gear cutting tool as the gear cutting tool that machined the first tooth side surface, by setting the intersection angle to be the same with the predetermined intersection angle, and by setting the phase correction angle to a second phase correction angle different from the first phase correction angle.

The invention relates to a method for measuring a tool (1) for roll machining toothed workpieces, wherein a virtual contact points is calculator on a rounded virtual blade of a virtual tool. The relative orientation between the tool axis (B) and the measuring device (11) as well as a translational relative position between the tool and the measuring device are then calculated and adjusted on the basis of the calculated virtual contact point. The measurement is taken on the real blade in the adjusted relative orientation and relative position, and the measurement can be taken in particular using a cylindrical scanning means in the form of a laser beam, wherein the cylindrical scanning means tangentially contacts the virtual blade in the virtual contact point.

The present disclosure relates to a method for gear skiving a workpiece, wherein: in a first step, the geometry of a tool, in particular of a skiving wheel, is measured for the machining of the workpiece in a state clamped in an apparatus for gear skiving machining; and in a subsequent further step, machining kinematics are determined for the gear skiving in dependence on the measured geometry of the tool characterized in that the absolute location of a cutting edge of the tool in the apparatus is determined in the first step.