Stary Oskol Technological Institute named after. A.A. Ugarov – branch of the National Research Technological
University “MISIS” (Staryi Oskol, Russia)

E. M. Martynov, Assistant, Dept. of Technology and Equipment in Metallurgy and Mechanical Engineering named after V. B. Krakht, e-mail: e.m.martynov@mail.ru

D. A. Vakarin, Graduate Student, Dept. of Technology and Equipment in Metallurgy and Mechanical Engineering
named after V. B. Krakht, e-mail: amidvak@gmail.com
A. P. Gaevoy, Cand. Eng., Head of the Dept. of Technology and Equipment in Metallurgy and Mechanical Engineering named after V. B. Krakht, e-mail: a_gaevoy@lst.ru

Gubkin branch of the National Research Technological University “MISIS” (Gubkin, Russia)
E. F. Romanenko, Dr. Eng., Associate Prof., Dept. of Mining Engineering, e-mail: balefed@yandеx.ru

National Research Technological University “MISIS” (Moscow, Russia)
V. V. Gorozhankin, Dr. Eng., Associate Prof., Dept. of Geology and Mine Surveying, e-mail: v17m3@mail.ru

The paper presents the results of analysis of literature data and an assessment of the state of friction pairs after operation. It was established that long-term operation of screw mechanisms of metallurgical machines under conditions of high power loads and intense wear leads to loss of their performance due to wear or destruction. Analyzing the methods for increasing the performance of screw mechanisms, we can conclude that use of surface plastic deformation (SPD) methods to increase durability of friction pairs of large-sized screw-nut transmission parts is promising. Computer simulation of the process of final thread profile formation via pulsed roller rolling (PRR) was carried out. It was established that the maximal values of σ_i = 880 MPa, ε_i = 4.69 mm and а_y = 0.092 are achieved for a preformed profile by mechanical processing with concaveness in the form of a trapezoid with a triangle and subsequent PRR of samples made of BrO10F1 bronze. This technology allows maximal hardening of the zones adjacent to the thread concaveness, which ensures increased fatigue strength. The new technical solution, aimed at improving the combined method of forming trapezoidal threads (RF patent No. 2731949) for large-sized parts of the screw mechanism of a roasting machine of the OK-306 type, was developed. The research results showed that use of PRR for trapezoidal thread samples makes it possible to: increase surface microhardness of the samples made of bronze grade BrO10F1 by 2.6 times; provide thickness of the hardened layer up to 2.8 mm; reduce the surface wear rate for the samples by more than 12 times compared to the initial state. The tests on nuts made of bronze grade BrO10F1 were carried out in the conditions of JSC “Stoilensky Mining and Concentrating Plant” as a part of the tension device in the trolley conveyor of the OK-306 roasting machine. Hardening the working surfaces of PRR trapezoidal threads made it possible to increase the service life of the nuts by at least 2 times.

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