Agular parameters of the center of deformation during the rolling of metal powder (review)
DOI:
https://doi.org/10.37142/2076-2151/2023-1(52)154Keywords:
rolling of metal powders, deformation centers, symmetry, angular parameters.Abstract
Radchenko O., Gogaev K., Askerov M., Voropaev V. Agular parameters of the center of deformation during the rolling of metal powder (review)
Considering the complexity of the powder rolling process, and the fact that there is a need to predict the rolling modes of new powders and complex powder systems, establishing the angular parameters of the deformation center is an urgent task. It is especially important to know the angular parameters when optimizing the rolling modes in cases where this operation is the last when obtaining the finished product. The review examines the angular parameters characterizing the symmetrical center of deformation during the rolling of metal powders in rolls with a smooth surface. It is shown that the rolling of metal powders is a complex process, for the description of which various angular parameters have been proposed at different times. 11 angles, their names, description, methods of definition and calculation are considered. Most of them had several names from which the most successful were chosen. New names have been proposed for three of them, which more fully characterize their physical essence. Angle values for different powders and different methods of their measurement were analyzed. The set parameters depend on the considered angles. The angle of capture of the powder was most fully investigated. For the angle of capture, according to the available literature, the parameters on which it depends are ranked according to their importance. In decreasing order of influence of the studied parameters, the grip angle depends on the roller-powder friction coefficient, the lateral pressure coefficient; relative bulk density of the powder; the width of the hopper and the external force applied to the powder. The influence of the physico-mechanical properties of the particle material on the capture angle remains unexplored. An advance angle is added to the existing angles, which together with the lag angle covers the entire deformation cell. It is shown that the ratio of lag and lead angles can be used to characterize such features of the deformation center as symmetry and the presence of forward tension, and can also characterize the plastic properties of the particle material.
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