Prediction of the sound pressure level of blanking noise during sheet-metal blanking using servo press with counterforce

摘要

In this research, a prediction model of the sound pressure level during blanking using servo press with counterforce was established based on the acoustic theory as well as the vibration equation of punch in the course of breakthrough process. The theoretical values of the sound pressure level of blanking noise were calculated based on the developed prediction model. The variation of the sound pressure level of blanking noise with different parameters was also investigated and compared with the experimental results. It reveals that the blanking noise increases with the shear strength and the thickness of sheet metal, and further the blanking speed. The relative error between the experimental results and the theoretical ones determined based on the prediction model is less than 1.7%, and the application example of the prediction model in batch production is given. The prediction model is thus proved to be promising and efficient for noise prediction during blanking using servo press with counterforce.