Moscow Polytechnic University, Moscow, Russia

R. L. Shatalov, Professor of Materials Forming and Additive Technologies Chair, Doctor of Technical Sciences, e-mail: mmomd@mail.ru

LTD “Hobbika”, Moscow, Russia

A. S. Kalmykov, Designer of Technological Systems and Equipment, e-mail: kalmykov.artiom@yandex.ru

Bogorodsky Branch of JSC of Scientific and Production Association “Pribor”, Noginsk, Russia

V. A. Medvedev, Engineer-Technologist, Candidate of Technical Sciences, e-mail: 10-bmt@mail.ru

LTD Kolchuginsky Non-Ferrous Metals Processing Plant, Kolchugino, Russia

S. A. Aleksandrov, Head of Rolling Department4, e-mail: sergeialeks33@gmail.com

The effect of deformation direction on the distribution of mechanical properties, structure and dimensional formation during cold rolling of 3.2 mm thick brass sheets (L63) from 4.5×380×380 mm billets on the 610×940 mill at Kolchuginsky Non-Ferrous Metals Processing Plant was studied. The initial billets were rolled in two passes with a total relative reduction of 30%. Some of the billets were deformed in the longitudinal direction, and some were turned 90 degrees before the second pass. It was found that the deformation direction affects the value and distribution of mechanical properties along the length and width of the sheet: during longitudinal rolling, the average hardness values were 80 HRB, yield strength – 253 MPa, tensile strength – 401 MPa; during rolling with turning, the average hardness values were 83 HRB, yield strength – 261 MPa, tensile strength – 419 MPa. During sheet rolling with turning before the second pass, the mechanical properties increase by 3–5 %. An increase and more uniform distribution of surface hardness due to additional distortion of the crystal lattice were also noted. At the same time, hardness anisotropy significantly decreased — from 8 to 3 HRB (by 38 %). It is shown that the sheet deformation direction has a significant effect on the grain size and shape. In longitudinal rolling, the microstructure has a distinctive directional texture of grains about 70 μm long and 25 μm wide. In rolling with turning, the microstructure contains crushed round grains about 30 μm in size. It has been experimentally established that in turning during rolling with a total reduction of 30 %, the value of the sheet width difference δВ decreases by 1.34 mm (by 87 %) compared to longitudinal rolling. The values of true deformations during longitudinal rolling and with sheet turning before the second pass were studied in the DEFORM-3D software package. It was found that during longitudinal rolling of sheets in one direction, the relative deformation value was 0.304, with turning – 0.181, i.e. 40 % lower. At the same time, the direction of rolling affects the formation of the sheet shape: rectangle or square. The conducted research made it possible to develop and implement rational rolling modes with turning of brass sheets (L63) on the 610x940 mill of the Kolchuginsky Non-Ferrous Metals Processing Plant and to improve the quality of sheet metal products by 7–9 %.

The authors express their gratitude to Chief Engineer E. A. Yudin for help and assistance in conducting a pilot experiment at Kolchuginsky Non-Ferrous Metals Processing Plant.

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