Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia

K. G. Pivovarova, Dr. Eng., Associate Prof., Prof., Dept. of Materials Processing Technologies, e-mail: k.pivovarova@magtu.ru
A. G. Korchunov, Dr. Eng., Prof., Head of the Dept. of Design and Operation of Metallurgical Machines and Equipment, e-mail: pemmo@magtu.ru

Magnitogorsk Hardware and Calibration Plant MMK-METIZ, Magnitogorsk, Russia
V. M. Tagirova, Leading Specialist, e-mail: odinaeva.vm@mmk-metiz.ru

Formation of the surface quality of calibrated rolled products is a complex complex problem, including issues of preparing the surface of the workpiece, as well as the choice of lubricants. Lubricants used to reduce friction and tool wear are a necessary and important element of the technological process. The processes of oxidation and decomposition of some components of the process lubricant lead to a significant decrease in the thickness of the lubricant layer in the contact zone and a decrease in shielding ability under conditions of high temperatures and pressures, which negatively affects the quality of the surface of calibrated rolled products. Obviously, to assess the quality of a process lubricant, it is advisable to measure its thermal-oxidative and thermal stability. To perform such measurements, the method of simultaneous thermal analysis was used. The paper presents the features of the experimental methodology and processing of experimental data using calorimetric (DSC) and thermogravimetric (TG) curves. Indicators for assessing the thermo-oxidative and thermal stability of lubricants are proposed, which make it possible to determine the temperature range of operation and the potential resource of their use. The results of the study showed that the thermal-oxidative stability of the synthetic technological lubricant Polytren HP-16 is 260 °C, and the thermal stability (heat resistance) is 192 °C. It has been established that the synthetic technological lubricant Polytren HP-16, used when drawing a workpiece after shot peening, makes it possible to obtain calibrated rolled products from grade 35 steel with the required surface quality at temperatures in the deformation zone not exceeding 260 °C.

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