THE INFLUENCE OF HETEROGENEITY OF MECHANICAL PROPERTIES ON FORCE PARAMETERS OF PLASTIC DERFORMATION

The analysis of processes under conditions of incomplete hot deformation from the point of view of practical implementation shows that the process itself is a sum of complex interconnected thermo-mechanical effects: billet heating, plastic deformation and cooling after deformation, which requires the construction of complex interconnected thermo-mechanical models. However, taking into account the calculation of deformable body temperature and the determination of mechanical properties caused by its change, the studies of plastic deformation still have not found wide applications in pressure treatment in developing technological processes. The present work studies the effect of inhomogeneity of temperature on the mechanical properties of metal and process of plastic deformation at partial hot stamping. The authors have calculated the change in temperature occurring in metal in the process of incomplete hot deformation and built a temperature field that corresponds to the process of deformation. There have been calculated the values of force parameters of plastic deformation for the stationary stage of backward extrusion process at a constant temperature and mechanical properties and with the heterogeneity of mechanical properties caused by irregular distribution of tempeture. There has been determined the influence of temperature inhomogeneity of mechanical properties on force parameters of the process of plastic deformation of metal at partial hot stamping. On the basis of the performed calculation it has been concluded that taking into accont the inhomogeneity of temperature in the deformation zone significantly affects the value of plastic deformation power. Power has approximately decreased by 24 %. In addition to that, the irregularity of temperature influences the nature of the stress-strain state, allows a more accurate account of uneven distribution of deformation and stress. This approach is a promising way of evaluating the technological capabilities of the processes of metals processing by pressure, and allows us to design the technological process of manufacturing products with the rational use of plastic properties of their material and technological support of forming the desired performance characteristics.

неравномерность распределения температуры, неоднородность механических свойств, пластическое формоизменение, неполная горячая штамповка, irregularity in temperature distribution, inhomogeneity of mechanical properties, plastic deformation, partial hot stamping

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