Digital Factory – theory and practice

The paper focuses on the research & development of the Digital Factory solutions for industry. The developed methodology and solution of Factory Mock Up (FMU) is presented. The results of research and development cover design of assembly system, its processes, simulations model, ergonomic analysis etc. In the paper are presented the solutions developed in the framework of co-operation with industrial partners like Volkswagen Slovakia, Thyssen Krupp – PSL, Whirlpool. The advantages, restrictions and way of utilization of Digital Factory solutions are also shown in the paper

Interatomic bonds and the tensile anisotropy of trialuminides in the elastic limit: A density functional study for Al₃(Sc,Ti,V,Cr)

International audienceThe tensile anisotropy in the elastic limit of Al3(Sc,Ti,V,Cr) intermetallic compounds in both L12 and D022 crystal structure have been investigated using first-principles density-functional calculations. In both both crystal structures the main bonding character comes from the saturation of dominant d3 (L12) and d4 (D022) hybrid orbitals located on the TM atoms. The series Al3Sc → Al3V corresponds to the gradually d-band filling and leads to a gradual increase of bond-strength and covalent bond formation. The magnetism of Cr breaks this trend in the Al3Cr compound (for both ferromagnetic and anti-ferromagnetic configurations). In this series, a trend towards an increased anisotropy of the elastic constants, Young modulus Y and Poisson ratio ν is observed. The easy and hard directions of tension can be simply identified by the variation of Y, which corresponds to the presence or absence of covalently bonded -Al-TM- chains. A high anisotropy of Poisson ratio arises also from an alternation of atoms in the lateral directions and can be understood in the same terms

Research on Chip Shear Angle and Built-Up Edge of Slow-Rate Machining EN C45 and EN 16MnCr5 Steels

One of the phenomena that accompanies metal cutting is extensive plastic deformation and fracture. The excess material is plastically deformed, fractured, and removed from the workpiece in the form of chips, the formation of which depends on the type of crack and their propagation. Even in case of the so-called ‘continuous’ chip formation there still has to be a fracture, as the cutting process involves the separation of a chip from the workpiece. Controlling the chip separation and its patterning in a suitable form is the most important problem of the current industrial processes, which should be highly automated to achieve maximal production efficiency. The article deals with the chip root evaluation of two EN C45 and EN 16MnCr5 steels, focusing on the shear angle measuring and built-up edge observation as important factors influencing the machining process, because a repeated formation and dislodgement of built-up edge unfavorably affects changes in the rake angle, causing fluctuation in cutting forces, and thus inducing vibration, which is harmful to the cutting tool. Consequently, this leads to surface finish deterioration. The planing was selected as a slow-rate machining operation, within which orthogonal and oblique cutting has been used for the comparative chips’ root study. The planned experiment was implemented at three levels (lower, basic, and upper) for the test preparation and the statistical method, and regression function was used for the data evaluation. The mutual connections among the four considered factors (cutting speed, cutting depth, tool cutting edge inclination, and rake angle) and investigated by the shear angle were plotted in the form of graphical dependencies. Finally, chips obtained from both steels types and within both cutting methods were systematically processed from the microscopic (chip root) and macroscopic (chip pattern) points of view

Fcc-to-bct phase transformation of aluminum under triaxial stresses: an ab initio constant pressure study

64.70.K- Solid-solid transitions, 61.50.Ks Crystallographic aspects of phase transformations; pressure effects, 62.50.-p High-pressure effects in solids and liquids, 61.50.Ah Theory of crystal structure, crystal symmetry; calculations and modeling,