Moscow Polytechnic University, Moscow, Russia:

R. L. Shatalov, Dr. Eng., Professor, e-mail: mmomd@mail.ru
E. E. Zagoskin, Postgraduate Student, e-mail: zagoskin86@yandex.ru

Bogorodsk branch of JSC NPO Pribor, Noginsk, Russia:
V. A. Medvedev, Technologist, e-mail: 10-bmt@mail.ru

The aim of the work was to identify the influence of temperature on hardness, structure and defects that cause increased wear of the piercing plug made of heat-resistant steel 4Kh5MFS three-roll screw rolling mill 30-80. For this purpose, screw rolling with incomplete firmware of 1000 pcs was carried out at a temperature of 1160 °C vessels made of 50 steel on a three-roll screw mill TPA 30-80, which is part of the rolling and pressing line (RPL) of the machine-building enterprise BF JSC NPO Pribor. It has been experimentally established that the temperature of the initial bar-billet during the formation of the closed cavity of the semi-finished product affects the heating of the plug parts: the nose is at least 600 °C, the tail is about 350 °C, as a result of which a ferrite ring with a height of about 0.6 mm is formed on the plug surface. Subsequent cooling of the plug with water for 2 seconds. up to a temperature of about 100 °C reduces the time of temperature exposure in the release cycle of vessels on the PPL. The results of changes in grain size and hardness at the stages of production every 100 pcs are presented. vessels along the length of the plug. A scheme for the production of semi-finished vessels made of steel 50 is proposed, which reduces the contact time with a rotating mandrel by 20 %. Reducing the immersion time of the mandrel during the formation of the vessel cavity led to a two-fold increase in its service life.

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