Chair of Casting Production and Reinforcing Technologies, Ural Federal University named after the first President of Russia B. N. Yeltsin, Ekaterinburg, Russia:

A. V. Sulitsin, Assistant Professor, e-mail: kafedralp@mail.ru
R. K. Mysik, Professor
S. V. Brusnitsyn, Professor
I. V. Ozhgikhin, Post-Graduate Student

JSC “Joint Enterprise “Katur Invest”, Verkhnyaya Pyshma, Russia:
V. A. Romanov, Head of Industrial-Technical Department

The purpose of this work is investigation of solid crust accretion kinetics in copper cast bar, manufactured on the HAZELETT continuous caster, in the process of copper rod production by CONTIROD continuous casting and rolling technology. Thermo-graphing of continuously cast bar was carried out. Cooling temperature curves were obtained, together with thickness of solid crust and depth of liquid metal cavity. Estimation of solid crust growth with the time in continuously cast bar was accomplished by thermo-graphing method with the help of specially designed starter billet with installed block of thermocouples. Mathematical processing of received time dependence of copper solid crust thickness allowed to establish the equations, which describe the solid crust accretion law with the time in different directions of copper cast billet cross sections with 120×70 mm dimension at 7 m/min casting speed and 1120 °C temperature. The time dependable accretion of solid crust in horizontal direction from side edge to the billet center is described by equation δ = 6.62·τ^0.61. At the same time, the same accretion in vertical direction from top edge to the center and from bottom edge to the center are described by the equations δ = 4.23·τ^0.69 and δ = 5.23·τ^0.63, respectively. The liquid metal cavity depth is 2750 mm. The highest temperature difference in horizontal section of the cast billet is 80 °С in the middle of the mold length, and 55…60 °С in vertical section. There was made a conclusion about probability of cracks formation on the cast billet side edge as a result of thermal stresses occurrence and capability of increasing in caster productivity without danger of liquid metal outburst at the exit of the mold. Results, obtained in this work, can be used for correction of technological order of combined continuous casting and rolling copper rod manufacturing process.

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