Using the "minimum risk" method in the technical diagnosis of metallurgical equipment
Keywords:rolling condition, lubrication system, technical diagnostics, “minimal risk” method
The difficult operating conditions of metallurgical equipment due to dynamic loads require special attention when designing components in the field of reliability and fail-free operation. In order to increase the reliability and durability of the spindle drive unit of the rolling stand of the hot rolling mill "1680", it is proposed to switch from "oil mist" type lubrication systems to "oil-air" type systems for bronze liners and bearings of the balancing mechanism. The oil-air lubrication principle has undeniable advantages in terms of component lubrication, flow distribution, and provides a volumetric flow of oil by injecting air into each bearing of the equipment, guaranteeing an accurate volume at each lubrication point, regardless of bearing back pressure, atmospheric pressure, temperature and oil viscosity . In order to optimize decision-making when designing new components and parts of metallurgical equipment, the vector of making reliable design decisions is increasingly shifting towards mathematical modeling of production processes and situations that arise during the performance of technological operations. It has been established that in order to determine the permissible value of the content of wear products in the form of metal shavings, one can use the general theory of recognition, which is an important section of technical cybernetics and deals with the recognition of images of any nature, namely, the "minimal risk" method. Recognition algorithms are partly based on diagnostic models that establish a connection between the state of a technical system and diagnostic signals coming from these systems. The performed calculations make it possible to accurately establish the limiting values of iron-containing impurities in the working fluid of the "oil-air" lubrication system and indicate that if the limit value x0 = 11 is exceeded, that is, if the content of iron-containing impurities in the working fluid is more than 11 g per 100 cm3, the object should be stopped for inspection and the working fluid should be cleaned by filtration. The possibility of determining the permissible value of the content of wear products in the form of metal shavings in "oil-air" lubrication systems using the general theory of recognition, namely the "minimal risks" method, which simplifies the process of setting the date of its cleaning by filtration, without burdening it with especially cumbersome formulas and calculations.
Hrechanyi О. М. Substantiation of the choice of technical parameters of the guillotine shears of the rolling mill. Metallurgy. 2017. No. 2. S. 126-130.
Dynamic processes in the stands of the broadband camp 1680. Monograph. / [В. V. Verenev, VI Bolshakov, A. Yu. Putnoki and others]. - Dnepropetrovsk: IMA-press, 2011. - 184 p.
Krot P. V., Nizhnik N. V. Problems of development of wear-resistant damping liners for sheet-rolling mill spindles. Fundamental and applied problems of ferrous metallurgy. 2006. No. 13. P. 298–306.
Air-oil lubrication for the steel and aluminum sectors. www.dropsa.com. URL:https://www.dropsa.com/flex/cm/pages/ServeBLOB.php/L/RU/IDPagina/2401 (access date: 16.02.2022).
Contributors to Wikimedia projects. Automatic lubrication system - Wikipedia. Wikipedia, the free encyclopedia.
URL: https://en.wikipedia.org/wiki/Automatic_lubrication_system (access date: 10.05.2021).
Hydraulic drives and hydropneumoautomatics of machine tools / [V. A. Fe-dorets, M. N. Pedchenko, A. F. Pichko et al.]. - K .: Vishcha school. Head publishing house, 1987. - 375 p.
Syritsyn TA Operation and reliability of hydraulic and pneumatic drives: A text-book for university students. / TA Syritsyn. - М .: Mechanical engineering, 1990. - 248 p.
Influence of technological process parameters on equipment dynamic factor / O. Hrechanyi et al. System technologies. 2021. Vol. 3, no. 134. P. 3–12. doi: https://doi.org/10.34185/1562-9945-3-134-2021-01.
Research of dynamics, strength and manufacturability of mechanical systems: monograph / LM Mamaev, OD Romanyuk, OV Nikulin and others. - Kamyanske: DSTU, 2017. - 183 p.
Technical diagnostics. Monitoring and forecasting. Monograph / A. Ya. Zhuk, G.P. Malyshev, N.K. Zhelyabina, O.M. Klevtsov. - Zaporozhye: ZGIA, 2008. - 500 p.
Belodedenko S.V., Hrechanyi O.M., Ibragimov M..S Models of "delayed repair" for maintenance of mechanical systems. Bulletin of railway transport certification. 2017. T. 43, № 3. P. 6–13.
Malyshev G. P., Hrechanyi O.M. Reliability study of inserts for spindle devices of mill 1680 TsKhP-1. Metallurgical and mining industry. 2016. No. 5. P. 118–122.
GOST 17216-71. INDUSTRIAL PURITY. Liquid purity classes. Chinniy vid 1973-07-01. View. official M. : Publishing house of standards, 1989. URL: https://docs.cntd.ru/document/1200005434.
ISO/FDIS 4406:2017(E). Hydraulic fluid power – Fluids – Method for coding the level of contamination by solid particles. Replaces ISO/TC 131/SC 6 ; effective from 2017-04-27. Official edition. 2017. 6 p.
Unique membrane water filtration systems. URL: http://www.eprom.net.ua/doc/masla/Pall%20Триботехническое%20значение%20фильтрации.pdf (access date: 17.02.2022).
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