Novomoskovsk Institute of Russian Chemical-Technological University named after D. I. Mendeleev, Novomoskovsk, Russia:

Yu. S. Dodin, Assistant Professor

M. N. Kamenskiy, Assistant Professor, e-mail: mkamensky@yandex.ru

Analysis of pressing of aluminum vessels on crank presses without preheating was carried out on the basis of industrial research. Peculiarity of this kind of pressing is concluded in definition of its basic parameters (temperature and force) by the process itself, not previously. According to this, a different approach in calculation of temperature and pressing forces is required. As a result of researches, a number of industrial enterprises have found that the beginning of a product-forming plastic flow occurs with a delay, defined by deformation, expended on the billet heating to the required temperature. At this temperature, deformation resistance of aluminum is reduced, and pressing force is reduced to the equilibrium state with resistance to formation of corps and vessel bottom. Further forces behavior depends on the ratio of these resistances. Significant decreasing of vessel bottom thickness increases the force to the end of the process. Calculation of maximum force, corresponding to required billet heating, offered the dependence, obtained on the basis of industrial research results. In order to determine the plastic flow beginning temperature, there should be used the experimental pressing diagrams. There is offered the analytical dependence, which uses a deformation operation, obtained on the basis of analysis of vessel pressing oscillograms in industrial conditions. Force decreasing during pressing can recommend the preheating of aluminum billets to the plastic flow beginning temperature. According to this, there can be removed the peak load in the pressing force, which favorably affect the equipment exploitation.

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