PROCESSING OF LARGE-SIZED PARTS OF HYDRO PRESSING AND MINING EQUIPMENT

Abstract

Modern heavy engineering is characterized by a significant proportion of small-scale and single forms of production. Machines produced for the metallurgical, energy, mining, chemical industries are characterized by high metal consumption and high labor intensity of their manufacture. For the manufacture of large-sized parts, either universal equipment and equipment are used, or technological complexes are created based on the use of unique equipment, large instruments and conductors, and in some cases – original tools (Mechanichna obrobka velikogabaritnikh detalei zi znospstiykimi naplavochnimi materialami (2015)). In the assembly of such components and machines, the fitting method is widely used. Due to the specific features of the processing of heavy and large-sized parts and the low seriality of their production, in the development of technology it is impossible to mechanically introduce progressive methods and methods of processing, as well as the organization of work that are widely used in large-scale and mass production of industries not related to heavy engineering. When processing these parts, there is often a need for original technical solutions ( Khrutskiy A.A., Slatvinskiy N.N., Chumak U.I. (2016); Stefaniv B.V. (2020)). The main tasks in the processing of heavy and large-sized parts are: achieving the required geometry of accuracy, surface roughness and physical and mechanical properties of the surface layer. Finishing and finishing operations, during which the physical and mechanical properties of the surface layer of massive parts are formed, and therefore their performance, are based on cutting materials, including those welded during the repair of wear-resistant coatings ( Mazin F., Bhaskaran G., Sabin V. (2023); Xinfeng Liu, Riliang Liu, Jaming Feng, (2023)). Processing of large-sized parts is very time consuming, associated with a lot of time. Therefore, one of the main issues that have to be addressed in heavy engineering is to increase the processing productivity as a result of the use of advanced technological solutions, a further increase in production equipment, its specialization, mechanization and partial automation (Dobrianskiy S.S., Malafeev U.M., Pukhovskiy E.S. (2014); Pukhovskiy E.S. (2021)). A significant reserve for increasing labor productivity in heavy engineering is the rational organization of production of large-sized parts, based on the use of group technological processes, typification of processes, normalization of equipment and tools, centralization of technological preparation of production, introduction of scientific and technological achievements (Kirilovich V.A., Melnichuk P.P., Yanovskiy V.A. (2017); Mechanichna obrobka velikogabaritnikh detalei, (2015)). The mining and metallurgical industries are the most export-oriented industries in our country. Therefore, the problem of providing these industries with modern equipment manufactured at heavy machinery factories is extremely urgent (Tokarnokaruselniy verstat Hwacheon HVT-2025M, (2021); Mechanichna obrobka velikogabaritnikh detalei), (2015)). A significant reserve for increasing the durability of large-sized parts is the restoration of their working surfaces after work in extremely difficult conditions of the mining industry. The high material consumption of such parts necessitates the return of friction surfaces to their original performance due to the application of various wear-resistant materials. At the same time, almost always the characteristics of the working surfaces exceed the performance of new parts. This can significantly reduce the capital costs of equipment and improve the performance of the restored parts. Recently, a lot of researches has been carried out in this area, which make it possible to introduce into production methods of applying wear-resistant coatings, and technologies for their processing to ensure high performance in the operation of mining and hydro pressing equipment ((Khrutskiy A.A., Slatvinskiy N.N., Chumak U.I. (2016); Mechanichna obrobka velikogabaritnikh detalei, (2015); Mazin F., Bhaskaran G., Sabin V. (2023); Olt J., Krasny V., Maksarov V. (2019); Xinfeng Liu, Riliang Liu, Jaming Feng, (2023)). The purpose of the work: Improving the efficiency of processing large-sized parts of mining and hydro pressing equipment based on optimal technological processes and modern machine tools.