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2021-06-24 Views 369

TIMELY DIAGNOSTICS OF HYDRAULIC EQUIPMENT IN METALLURGICAL PRODUCTION

E. V. GAPEENKO     Precision control of hydraulic equipment is a distinctive feature of modern hydraulic systems. With the help of special diagnostic devices, it is possible to reliably and simply monitor the operation of hydraulic equipment. Diagnostic methods can be very different. The article lists the stages and methods of checking hydraulic equipment malfunctions, as well as describes the principles of operation of diagnostic devices of well?known world manufacturers HYDAC, MOOG, used in OJSC “BSW – Management Company of the Holding “BMC”. Schematically, the connection of the MOOG tester to the production equipment is presented when checking the servo valve in autonomous and combined mode, without resorting to dismantling the valve. Continuous montoring of the oil purity with the help of the HYDAC FCU device allowed saving time on assessing its condition and taking fast?acting corrective measures to clean the oil from contamination. More...

2021-07-22 Views 381

ANALYSIS OF THE CAUSES AND CONDITIONS FOR THE FORMATION OF SURFACE DEFECTS ON HOT-ROLLED PRODUCTS FROM PERITECTIC STEEL GRADES OBTAINED UNDER THE CONDITIONS OJSC “BSW – MANAGEMENT COMPANY OF THE HOLDING “BMC”

A. V. TERESHCHENKO, N. A. KHODOSOVSKAYA      OJSC “BSW – Management Company of the Holding “BMC” produces a wide range of carbon, high?quality, alloyed and high?carbon steel grades, among which a significant share is peritectic grade steels. Basically, the steel of this group is used to produce rolled products intended for the manufacture of components for the automotive industry. The process of production and casting of these steels is characterized by the greatest instability and is often accompanied by rejects and forced sorting of products. This situation is typical for other metallurgical enterprises. Therefore, the search for technological solutions that ensure an increase in the yield while maintaining the existing productivity of metallurgical units is an urgent aspect of improving the technology of continuous casting of peritectic grade steels. At the same time, the main scientific and technical task is to obtain a stable quality of continuously cast billets, aimed at preventing and eliminating the formation of a number of characteristic defects, primarily cracks on the surface of continuously cast billets and rolled products. The search for methods and technological solutions to improve the quality of products made of peritectic grade steel is the goal of the ongoing research. More...

2021-07-24 Views 348

MODERNIZATION OF THE BRAKE SYSTEM OF UNWINDING ON ROPE MACHINES

S. S. KONOVALCHUK, I. M. LIVSHITS     In order to reduce the cost of producing metal cord in the hardware shops of OJSC “BSW” – the Management Company of the Holding “BMC”, work is underway to modernize and select materials for replaceable technological equipment. In the process of twisting the metal cord on the unwinding of the power coils of rope machines, brake devices are used, consisting of a disk and sectors (pads) fixed in a chain. The elements of the unwinding unit are in constant contact, providing the necessary tension force for unwinding a thin wire. The performance of the braking devices affects the manufacturability of the twist, the absence of breaks, the density and geometric arrangement of the wires in the twisted metal cord that meets the requirements of consumers. Due to constant contact friction at high linear speeds, the brake pads wear out, which leads to emergency operation of the equipment. The article considers the test results of the modified thin wire unwinding unit and the impact of modernization on the service life of brake pads. More...

2021-07-24 Views 350

INVESTIGATION OF BREAKS OF THE “SPARKING” TYPE OF BRASS- PLATED WIRE FOR METAL CORD AND HIGH-PRESSURE HOSES AND THE CAUSES OF THEIR FORMATION

E. S. SEREGINA, T. N. AYUPOV       The article examines the breaks of thin brass?plated wire for metal cord and high?pressure hoses of the “sparking” type and the causes of their formation. The wire was manufactured in OJSC “BSW”? the Management Company of the Holding” BMC “ in the conditions of steel?wire workshops. The appearance and microstructure of breaks of thin brass? plated wire of the “sparking” type are investigated. As a result of the analysis of the appearance and microstructure of the breaks, it was assumed that surface defects are formed on the brass?plated wire – billet during the welding connection in the jaws of the welding machine during annealing. To confirm this, experiments were carried out with the implementation of welded joints of brass – plated wire?blanks in wet drawing areas, the appearance and microstructure of the obtained samples of welded joints were studied. As a result of experiments and metallographic studies, the assumption was confirmed that local defects such as “cauterization from sparking” on the surface of the workpiece wire are formed during welding during the annealing operation, it was established that the cause is a violation of contact between the wire and the pressure jaws of the welding machine, wear of the pressure jaws. Photos of the defect, a description of its appearance and microstructure are given. Based on the obtained studies, a number of measures were carried out aimed at eliminating the causes of this defect. More...

2021-08-24 Views 354

TECHNICAL AND ECONOMIC ADVANTAGES OF USING ELONGATING MANDREL MADE OF FORGED BLANK WHEN ROLLING ON A CONTINUOUS MILL WITH A CONTROLLED-MOVABLE MANDREL

A. I. TOVSTELEVA   In the article, the current problem of reducing the cost of pipe?rolling products, which is especially acute in the world market of metal products high competition conditions is considered. A significant share in the cost of pipe products stands at the cost of rolling tools. Reducing the cost of buying adeforming tool allows you to make considerable savings in the seamless pipes’ production. The article presents: analysis of the economic efficiency of manufacturing long cylindrical mandrels from a semi?finished product – forged billet at OJSC «BSW – management company of «BMC» holding»; development of the technological process for the production of long mandrels depending on the required size; the results on the manufacture of long cylindrical mandrels from forged billet at OJSC «BSW – management company of «BMC» holding», as well as their industrial tests in the conditions of the pipe rolling shop. A positive result of using long mandrels of the PQF mill made of forged blanks was obtained.   More...