Acta Mechanica Slovaca 2025, 29(3):42-47 | DOI: 10.21496/ams.2025.024

Influence of Double Layer Configuration on the Quality of the Sheared Edge of Blanks Produced from Soft Electrical Steel

Martin Matej Benda^{1, *}, Emil Spišák¹, Peter Mulidrán¹, Ľuboš Kaščák¹

Institute of Technology and Materials Engineering, Faculty of Mechanical Engineering, Technical University of Košice, Mäsiarska 74, 040 01 Košice, Slovakia

Blanking in double layered configuration is unexplored technology producing blanks with quality of the sheared edge that cannot be predicted accurately using same criteria as in prediction of blanks produced by conventional blanking as each layer in configuration is blanked under different conditions. While the top layer is in contact with the set geometry of the punch and blankholder, the die is replaced with bottom layer. In the case of the bottom layer, it is in contact with set geometry of the die and the punch is replaced with the top layer. Research on double layer samples and conventional samples was conducted. Samples were observed under Keyence microscope and double layer samples were compared to the samples of conventional blanking. These observations revealed shortcomings of the double layer configuration in the form of greatly increased dishing deformation, difference in the sheared edge for each layer of the configuration and decrease in the quality of the sheared edge on the bottom layer of the configuration.

Keywords: electrical steel, double layer blanking, punching

Received: July 21, 2025; Revised: September 29, 2025; Accepted: October 13, 2025; Published: October 1, 2025  Show citation