Fotios Bantes

Bio: Fotios Bantes is an academic researcher from National Technical University of Athens. The author has contributed to research in topics: Shearing (manufacturing) & Deformation (engineering). The author has an hindex of 1, co-authored 1 publications receiving 3 citations.

Numerical Analysis of the Deformation of a Shearing Machine Tool under Excessive Blade Clearance

Abstract: Guillotine shearing machines for metal sheet may be inadvertently operated at increased blade clearance. Typical cases were studied using commercially available finite element software with an explicit solver. Loads causing elastic deformation to the machine structure arise from plastic deformation of the sheet metal being processed, its behavior being modelled by modified Johnson-Cook law. Excessive clearance was found to overload the machine considerably compared to normal clearance, owing to considerable lateral forces. As a result, the guillotine and much less so the base of the machine, undergo oscillatory deformation and the sheet is partly sheared and mostly bent. Such analysis helps the designer understand structural issues of the machine tool in extreme situations and modify the design appropriately.

Numerical modelling of the metal blanking process

Abstract: Prediction of the properties of products of the blanking process is nowadays still mainly an empirical effort. The lack of fundamental knowledge of the process may cause lengthy process development, and obstructs process innovation. Consequently, a validated numerical model of the process would be of great value. In this paper, an elasto–plastic finite-element model will be introduced, in which the extremely large deformations occurring, are handled by an operator split arbitrary Langrange Euler (ALE) method combined with remeshing. Special attention is given to the convective part of the ALE formulation. Ductile fracture is incorporated by a discrete crack approach. To demonstrate the possibilities of the procedure, some simulation results are presented.