Department of Metal Forming and Additive Manufacturing at the Moscow Polytechnic University, Moscow, Russia:

Pham Viet Hoang, Postgraduate Student, e-mail: hoangsqktqs@gmail.com
R. L. Shatalov, Professor, Doctor of Technical Sciences, e-mail: mmomd@mail.ru
Chan Wu Kuang, Postgraduate Student, e-mail: tranquang1584@gmail.com

Mashinostroitelny zavod LLC, Dong Nai, Vietnam:
Huong Xuan Hoang, Supervisor of the Rolling Mill Facility, e-mail: hoangmta14@gmail.com

This paper describes the results of a study that looked at the effect of contact conditions (including the use of industrial oil I40 (5%) for roll lubrication) on the deformation performance and power draw of a twin cold mill 175×300 operated by the machine building site in Dong Nai, Vietnam, when rolling 0.55 mm thick bands made of aluminium alloy AD33. The initial band size is 0.7×100×2,000 mm. The authors considered reological properties of the aluminium alloy, as well as the roll lubrication environment, to come up with a rational rolling process designed for 0.55×100 mm bands made from 0.7×100×2,000 mm rolled steel. Due to the use of industrial oil I40 (5%) in the mill 175×300, the number of passes could be reduced from three to two. The use of industrial oil I40 (5%) in the twin mill 175×300 ensured the specified precision and helped reduce the loads. Compared with dry rolling, due to the use of industrial oil I40 (5%), the rolling force could be lowered by 6 kN (8.3%) in the first pass and the power draw – by 0.025 kW (3.34%). At the same time, the second pass saved 2.96 kN (5.24%) of rolling force and 0,017 kW (3.95%) of power while ensuring the preset band thickness at the mill exit. Compared with dry rolling, when using I40 oil, the rolling force distribution efficiency along the band length rises by 22.7% in the first pass and by 14.64% in the second pass. When using I40 oil (5%), the strain distribution u nevenness along the band length drops by 39.15% — from 2.35 to 1.43% in the first pass and by 70.08% — from 3.81 to 1.14% in the second pass. When using I40 oil (5%), the thickness distribution along the length of aluminium band at the mill exit is more even than when the rolls are dry or use water. It also results in a minimized longitudinal thickness variation δh – i.e. 0.01 mm. These findings helped develop a rational rolling process for AD33 aluminium alloy bands that relies on the use of industrial oil I40 (5%) to lubricate the rolls of an industrial twin mill, while cutting the loads and saving power.

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