EFFECT OF PUNCH COATINGS ON BLANKING FORCE AND NUMERICAL PREDICTION OF FRACTURE ANGLE IN NON-ORIENTED ELECTRICAL STEEL

Abstract

This paper presents an experimental and numerical evaluation of the blanking process of non-oriented electrical steel designated as material G. The experimental study evaluated the effect of FeinAl, Movic, and FeinAl + Movic coatings on blanking force at 1 % and 7 % punch-die clearances. In addition, the fracture angle of the blank was determined at punch-die clearances of 1 %, 3 %, 5 %, 7 %, and 10 % of the sheet thickness. The fracture angle was predicted using numerical simulation in Simufact Forming software, and the predicted values were compared with the experimentally determined values. The results showed that the use of coatings reduced the blanking force at both evaluated punch-die clearances. The most significant effect was achieved with the Movic coating. At 1 % punch-die clearance, F15, corresponding to blanking the inner hole, decreased by 23.4 %, while F25, corresponding to blanking the outer circumference of the blank, decreased by 17.0 %. At 7 % punch-die clearance, the decrease was 8.9 % for F15 and 21.7 % for F25. The experimentally determined fracture angle varied only slightly at punch-die clearances of 1 %, 3 %, and 5 %, whereas a more pronounced decrease was observed at 7 % and 10 %. The mean absolute deviation between the experimentally determined and predicted fracture angle values was 3.09°, indicating the applicability of the numerical model for fracture angle prediction under the evaluated blanking conditions.

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