Abstract: In order to study the influence of blanking process on the magnetic properties of non-oriented electrical steel lamination, different shapes of punch and different blanking clearances are adopted. The relationship between the magnetic property deterioration and residual stress distribution of non-oriented electrical steel is studied. The results show that the blanking performance of the flat punch is the best, and the concave punch is better than the beveled one. In the considered blanking clearance range (5%～20% of sheet thickness), the magnetic property deterioration of the non-oriented electrical steel lamination decreases at first and then increases with the increasing blanking clearance. There exists an optimal clearance for reducing the magnetic properties deterioration. The magnetic property deterioration of non-oriented electrical steel lamination is mainly related to the peak residual stress. The larger the peak residual stress is, the worse the magnetic properties are. The study can provide parameter optimization guidance for blanking process of non-oriented electrical steel in industry.

Key words: blanking process; non-oriented electrical steel lamination; magnetic property tests; residual stress