Abstract
An experimental hot screw rolling is carried out on a three-roller TPA 30-80 mill with incomplete piercing of round steel vessels under the conditions of a machine-building enterprise BВ AO "NPO "Pribor". It is shown that the existing temperature-deformation modes of vessels processing on a screw mill lead to an uneven distribution of temperature from 175 to 605 °C and hardness along the length of the mandrel made of R18 steel. Temperature fluctuations negatively affect on the hardness, which decreases from 57 to 38 HRC, and the durability of the piercing mandrel, due to the high heating of its nose up to 605 °C. It is established that after 100 vessels rolling the maximum deviations from the mandrel axis are about 0.72 mm and are observed closer to the toe of the mandrel at a distance of 10...20 mm. Loss of stability relative to the rolling axis leads to increased wear of the piercing mandrel, to nades and risks and, as a result, to defects in the geometric dimensions of produced steel vessels made of 50 steel. Experimentally established quantitative patterns of uneven distribution of temperature and hardness along the length of the mandrel can be used to develop technological solutions to improve the quality indicators of the deforming tool and steel vessels on the piercing TPA 30-80 mill.
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