Moscow Polytechnic University, Moscow, Russia

S. А. Тipalin, Professor of the Department of Pressure Materials Processing and Additive Technologies, Candidate of Technical Sciences, Associate Professor, tsa_mami@mail.ru

R. L. Shatalov, Professor of the Department of Pressure Materials Processing and Additive Technologies, Doctor of Technical Sciences, Professor

М. V. Bodnar, Postgraduate Student of the Department of Pressure Materials Processing and Additive Technologies, bodnar-1999@inbox.ru

CJSC Metal Cookware Plant, Kolchugino, Russia
Zh. Е. Shchendryakova, General Director

The study results of the effect of pre-accumulated deformation during rolling of L63 brass sheets on the uniformity of wall thinning during drawing of an axisymmetric “basin-shaped” part are presented. It is shown that pre-deformation reduces the spread of thinning during subsequent shaping of the workpiece. It has been found that in order to reduce the anisotropy of the brass sheet, it is advisable to roll the sheet with a 90-degree rotation of the workpiece. After annealing the material, it is recommended to compress the sheet by about 10% on a rolling mill to reduce the thickness difference of the part during stamping. When comparing the relative decrease in the wall of the part without pre-hardening of the workpiece and with the amount of predeformation of the workpiece by 10%, there is a decrease in the relative wall thinning δ = (s – s0)/ s0 by almost two times (from 0.126 to 0.061). At the end of the flange, the workpiece increases its thickness during the drawing process. However, when using a pre-rolled workpiece, the relative change in the wall size is δ = 0.109, and without pre-hardening of the workpiece, δ = 0.128. At the same time, the spread of thinning in the most loaded sections of the workpiece is reduced by half. Studies have shown that an increase in deformation above the specified value is not advisable, since this does not lead to an improvement in the result, but reduces the ductility of the workpiece.  Theobtained computer simulation results have been experimentally verified on a stamped sample. The conducted research has made it possible to develop and implement rational modes of rolling brass (L63) sheets on a 610×940 double-roll reversing mill at Kolchuginsky Non-Ferrous Metals Processing Plant and stamping “basinshaped” parts on a P3228A press with force of 630 kN at Metal Cookware Plant in Kolchugino. The implemented development has improved the quality of parts by 6–8%.

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