Moscow Polytechnic University, Moscow, Russia

S. A. Tipalin, Cand. Eng., Prof., Prof., Dept. of Materials Forming and Additive Technologies, e-mail: tsa_mami@mail.ru
M. V. Bodnar, Master's Student, Dept. of Materials Forming and Additive Technologies
V. B. Belousov, Postgraduate Student, Dept. of Materials Forming and Additive Technologies

Changing the thickness of the sheet blank during the drawing process affects the quality of the resulting part. In this regard, it is necessary to accurately predict the change in this parameter during the drawing process. The proposed calculation method, which involves introducing the coefficient into the solution of the strain rate components equations, shows the proportion of the strain rate that is taken over by the change in thickness. A method is shown for determining the transition boundary between the zone of thinning and increasing thickness on the flange of an axisymmetric workpiece. The changes in the transition boundary from thinning to thickening are shown in the form of graphs depending on the ratio of the diameter of the workpiece to the diameter of the retracted layer. It has been shown that the force conditions of the process can be greatly influenced by blank holder. It has been established that the hold-down pressure has a minimal effect on the process power if the diameter of the workpiece approaches the die orifice diameter. As the diameter of the workpiece increases, the influence of the hold-down pressure becomes significant, which leads to a decrease in power values. Changes in the thickness of the sheet material flange made of steel 08ps with a thickness of 0.5 and 1 mm are considered. It has been experimentally established that with the same amount of material drawn into the die orifice, the increase in flange thickness is greater for a workpiece of smaller diameter. It was found that the relative change in flange thickness is affected by the thickness of the material. In addition, it is necessary to take into account the dependence of the properties of the sheet material on its thickness, which is a consequence of the technological features of producing these sheets by rolling.

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