At present, the crankshaft pulley of the automobile engine is gradually improved from a rigid structure to a soft coupling type—a crankshaft torsional vibration damper, which can prevent the crankshaft from being partially bent due to additional load (generator, air pump) and overcome the engine output. Vibration caused by the torque process. Therefore, the torsional vibration damper is an important part related to the performance of the vehicle, which plays an important role in the life of the engine. The pressing amount of the torsional vibration damper directly affects its performance, which is the most during the processing of the torsional vibration damper. Key processes.