For the transmissions of electric vehicles to develop the desired high torque under all driving conditions, a very large gear ratio is needed, which requires high speeds. And to ensure sufficient momentum at all speeds and enable the driver to accelerate without shifting gears, the electric drive must achieve up to 15,000 rpm, which is about three times that of a typical combustion engine. This puts a lot of strain on the rotor shaft. The manufacturers of rotor shafts are thus facing new challenges, such as the significantly lower shape and position tolerances and the need for greater machining precision.
A newly developed measuring probe now allows Liebherr-Verzahntechnik GmbH the possibility of precise corrective measurement in the gear shaping machine. The measuring probe sits directly on the tool spindle and is therefore in the same coordinate system as the pinion type cutter itself. This reduces inaccuracies which might arise due to a tool change or turning a workpiece and leads to considerably higher quality and process reliability.
IMTS visitors can experience live machining with the WFL M50 MILLTURN/3000 mm. The multifunctional turning-boring-milling center is designed for complete machining of complex chuck and shaft parts up to 670 mm swing over bed. Turning, milling, drilling, hobbing, shaping, gun drilling as well as ID machining can be performed under any angle of the tool.