The paper presents a research study into the effect of temperature on the properties of a mandrel and a punch during hot screw rolling and subsequent forging of 1000 medium-carbon structural steel vessels at the rolling and pressing line of the BF JSC NPO Pribor machine-building enterprise. According to the performed study, the main cause of downtimes in the technological production cycle and decreased geometric quality indicators of rolled products is related to deteriorated mechanical properties of the deforming tool. Significant temperature variations (more than 250°C) along the length of the piercing and pressing tool, made of 4Kh5MFS steel, during the hot pressure treatment were revealed. The main reasons leading to deterioration of the tool quality were established, including the loss of its strength and hardness, as well as an increase in the ductility of a piercing mandrel and a punch of up to 30 and 19%, respectively. The study identified rational ways to extend the service life of the most loaded processing tools and decrease the cost of vessels at the exit of the rolling and pressing line by 3–5%.
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Translated from Metallurg, Vol. 67, No. 8, pp. 18–22, August, 2023.
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Shatalov, R.L., Zagoskin, E.E. & Medvedev, V.A. Effects of Uneven Temperature Variations on the Mechanical Properties of a Rolling and Pressing Line Deforming Tool. Metallurgist 67, 1086–1092 (2023). https://doi.org/10.1007/s11015-023-01600-6
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DOI: https://doi.org/10.1007/s11015-023-01600-6