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Numerical modelling and simulation of the shear-slitting process of electrical steels

Bohdal Łukasz, Kułakowska Agnieszka, Kułakowski Marcin

Acta Mechanica et Automatica

2024

Vol. 18, no. 2

341--351

Despite the development of laser processing, the mechanical cutting process is still widely used in the formation of electric steels that are very sensitive to thermal phenomena. However, proper process control is difficult due to the large number of factors determining the quality of the products. As a result, the quality of the cut edge is characterised by the presence of burrs, the removal of which increases the production costs. Due to their magnetic properties, these materials should not be exposed to excessive stresses and deformations. The article presents the possibilities of predicting the characteristic features of the cut edge as well as stress distributions in this area. Original shear-slitting finite element method (FEM) models were developed, the results of which were verified experimentally. The proposed method based on stress triaxiality analysis enables precise analysis of stress states in the cutting zone and the boundaries of the slip fracture transition in the separating fracture, as well as determining the method of material cracking. Variable control factors such as cutting clearance, rake angle of the upper knife, and cutting speed were taken into account in the models. Parametric analysis of the process was carried out and it was determined how the process parameters should be selected in order to obtain the appropriate quality of the product. The developed analysis results can be useful on production lines for proper process control.

Experimental and numerical investigations and optimisation of grain-oriented silicon steel mechanical cutting process

Patyk Radosław, Bohdal Łukasz, Gontarz Szymon

Acta Mechanica et Automatica

2022

Vol. 16, no. 3

292--300

The process of mechanical cutting of magnetic materials has many advantages in the form of high efficiency with reduced process costs in relation to other cutting technologies; no thermal stresses in the material, which significantly deteriorate the magnetic properties; or the possibility of shaping materials taking into account long cutting lines. In industrial practice, it is very difficult to ensure appropriate conditions for the cutting process and its proper control. Currently, there are no data on the selection of technological parameters of the mechanical shear slitting process of grain-oriented silicon steel in terms of the obtained cutting surface quality and the obtained magnetic properties of the workpiece. The article presents the possibilities of forecasting the characteristic features of the cut edge and selected magnetic properties of grain-oriented silicon steel. For this purpose, proprietary numerical models using FEA (Finite Element Analysis) were used. Then, experimental studies were carried out, and the optimisation task was developed. The developed results enable the correct selection of technological parameters of the process, ensuring the appropriate quality of the cut edge of steel and minimal interference with the magnetic properties.