DOI: 10.52150/2522-9117-2023-37-557-577

Bilodidenko Serhii Valentynovych, D. Sc. (Tech.), Professor, Ukrainian State University of Science and Technologies, Lazariana St., 2, Dnipro, 49010, Ukraine. ORCID: 0000-0002-5768-594X. E-mail: sergeibelo@gmail.com

Маzur Ihor Anatoliiovych, Ph. D. (Tech.), Associate Professor, Ukrainian State University of Science and Technologies, Ukrainian State University of Science and Technologies, Lazariana St., 2, Dnipro, 49010, Ukraine. ORCID 0000-0003-2177-7110. E-mail: i.a.mazur@ust.edu.ua

Dobriak Volodymyr Dmytrovych, Ph. D. (Tech.), Leading Engineer, State Enterprise “Ukrainian Institute for Designing Iron and Steel Works”

Uhriumov D. Yu., Technical Director, LLC “MCK”, Ukraine

Uhriumov Yu. D., Ph. D. (Tech.), Leading Engineer, LLC “MCK”, Ukraine

WAYS TO IMPROVE BRAKING OF MOVING PARTS OF THE PILGER MILL FEEDING APPARATUS

Abstract. One of the main factors on which the successful rolling of pipes on pilgrim mills depends is the operation of the feeders, which largely determines the productivity of the mills and the quality of the pipes. We considered the shortcomings of the feeding devices of pilgrim states, which are operated in Ukraine. One of the main disadvantages of these feeders is the significant speed of the moving parts when the sleeve meets the rolls, which is due to the poor braking conditions of the moving masses. The main areas of improvement of the braking conditions of the moving masses of the feeding apparatus during the application of the sleeve to the rolls of the pilgrim mill are considered. The paper considers, among others, such directions as the use of additional braking devices to the main hydraulic brake and improvement of the hydraulic brake design. One of the directions for improving the braking of moving parts is the inclusion of an additional spring-hydraulic buffer in the hydraulic braking system. A graph is presented that allows you to reasonably choose the moment when the buffer starts to work. A feeding apparatus is proposed, in which, due to the reduction of the braking force, the disturbing effect of moving masses on the carriage of the feeding apparatus is reduced, as a result of which the oscillation of the carriage and the deviation of the feed of the sleeve to the rolls in each pilfering step are reduced. In the new feeder, between the brake chamber and the hydraulic (water) chamber, instead of a throttle valve and two non-return valves, overflow valves of the plunger type are built in. Calculations of the braking modes of the moving parts of the feeding device have been made. The parameters of the overflow valve spring, the cross-sections of channels and valves, which ensure the constancy of the braking force along the entire braking path, due to which the magnitude of this force is reduced by approximately two times, are determined. The consequence of this is a reduction in the vibrations of the carriage of the feeder and an improvement in the quality of the pipes.

Key words: pilgrim mill, rolls, feeder, pipe, sleeve, mandrel, braking chamber, moving parts of the feeder, spring-hydraulic buffer, throttle valve, plunger-type overflow valve, braking force.

DOI: https://doi.org/10.52150/2522-9117-2023-37-557-577

For citation: Bilodidenko, S. V., Маzur, І. А., Dobriak, V. D., Uhriumov, D. Yu., & Uhriumov, Yu. D. (2023). Ways to improve braking of moving parts of the pilger mill feeding apparatus. Fundamental and applied problems of ferrous metallurgy, 37, 557-577. https://doi.org/10.52150/2522-9117-2023-37-557-577

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