REFINING MODEL OF MATERIAL MECHANICAL PROPERTIES AT SEPARATING COLD METAL BY SHEARS

P. V. Borovik

Abstract


Carrying out operations of longitudinal and transverse cutting of rolled metal in the conditions of modern rolling production are often performed using shears, which are quite complex machines in terms of kinematics and design. Further development of cutting processes and machines requires solving urgent problems of researching separation processes and expanding the capabilities of equipment, by increasing the accuracy of mathematical modeling and increasing the reliability and scientific validity when making design and technological decisions. On the way to solving these problems, preference is given to experimental studies of pressure treatment processes. However, this approach is not always able to ensure the completeness of the information received, since it requires a number of additional financial costs and organizational actions. At the same time, the growth of the capabilities of computing technology, as well as the development of theoretical research methods based on the development of numerous mathematical models, opens up new prospects for researchers. These models are based on the laws of the theory of elasticity and plasticity, as well as fracture mechanics. Such an integrated approach, combined with reliable information on the mechanical properties of a particular material, allows to fully reflecting the real physical processes occurring in the metal.

In the article, on the basis of the finite element method, a previously developed model of mechanical properties in a cold state with respect to shear cutting processes is analyzed. It is noted that the rate of deformation in static tensile tests depends on the elongation. Taking into account this factor leads to increased accuracy of modeling of cutting processes on shears. The results of the work can be used in further studies of dividing operations of section profiles on shears.

Keywords


mathematical model; mechanical properties; shears

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DOI: https://doi.org/10.31319/2519-2884.tm.2020.13

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Copyright (c) 2020 P. V. Borovik

ISSN (print) 2519-2884

ISSN (online) 2617-8389