Profiling methods for generation of modified grinding worms

A method for profiling a spiral of a cylindrical rotating grinding worm for diagonal hob grinding using a rotating disk-shaped profiling tool, comprising:

• performing at least one of an advancing movement of the rotating disk-shaped profiling tool along the spiral of the rotating grinding worm and an advancing movement of the rotating grinding worm along the rotating disk-shaped profiling tool,
• engaging the spiral of the grinding worm being profiled with the profiling tool along the entire depth of the spiral during a stroke in a direction of one of said advancing movement, and
• completing an additional movement of the grinding worm during the movement in one of said advancing direction, said additional movement consisting of a rotating movement of said grinding worm around a second axis (C) perpendicular to an axis of rotation (B) of said grinding worm,
• wherein the magnitude of the rotating movement completed during one of said advancing movement depends on a position of the profiling tool relative to the spiral of the grinding worm, and,
• wherein said method for profiling forms faces of the spiral of the grinding worm having at least one of a pressure angle that diverges from a nominal pressure angle and a pressure angle that changes constantly along segments of the width of the grinding worm.

A method of profiling a spiral of a cylindrical grinding worm for diagonal hob grinding of gearwheels, the grinding worm having a width dimension, the method comprising the steps of:

• rotating the grinding worm around a first axis;
• rotating a disc-shaped profiling tool around a second axis;
• moving the profiling tool relative to the grinding worm in a first direction perpendicular to the first axis into engagement with a spiral of the grinding worm over an entire depth of a tooth face of the spiral of the grinding worm;
• moving the profiling tool relative to the grinding worm in a second direction parallel to the first axis so that the profiling tool crosses the entire width of the grinding worm;
• synchronizing the movement in the second direction with a rotating angle of said grinding worm;
• and
• performing a rotational motion of the profiling tool relative to the grinding worm around a third axis which is perpendicular to the first direction and to one of said first and second axes in at least a sector of the movement in the second direction, said rotational motion being synchronized with the movement in the second direction such that a pressure angle of the tooth face of the grinding worm changes continuously within the sector.