Machine tool for fine machining the tooth flanks of pretoothed gearwheels

A machine for fine machining the tooth flanks of pretoothed gearwheels, said machine comprising:

• a carrier for receiving the gearwheel to be fine machined, said carrier having means for driving the gearwheel in a rotary manner about the axis thereof;
• a tool comprising a spindle mounting a grinding worm and a polishing worm, said polishing worm being displaced from said grinding worm along the axis of said spindle;
• a tool slide for receiving said tool and having means for rotating said tool about the axis of said spindle, said tool slide being movable radially and tangentially with respect to the gearwheel and axially along the gearwheel, said tool slide moving said tool radially into engagement with the gearwheel, said tool slide moving said tool tangentially of the gearwheel in a given direction for sequentially engaging said grinding worm and polishing worm in the gearwheel, said tool slide moving said tool with an axial component in one direction when said grinding worm engages the gearwheel while simultaneously moving said tool tangentially in said given direction, only said grinding worm engaging the gearwheel during movement tangentially in the given direction and with the axial component in the one direction, said tool slide moving the tool with an axial component in the other direction when said polishing worm engages the gearwheel while simultaneously moving said tool tangentially in said given direction, only said polishing worm engaging the gearwheel during movement tangentially in the given direction and with the axial component in the other direction;
• and
• means for synchronizing the rotation of the gearwheel and said tool for securing the engagement of the latter with the former.