It is often an unattainable task to ensure high accuracy of machining of hard-to-reach overall equipment when performing repair work outside a machine-building enterprise. Therefore, it is currently relevant to abandon these operations in favor of the use of specialized mobile machines, which will significantly reduce the cost and time of such repairs. Now the market is widely represented by mobile machines of foreign companies for processing large-sized products. Their cost starts from 3.5 million rubles, while technological equipment for expanding the capabilities of the machine is considered an option and is not included in the basic package. This significantly affects the choice of such equipment by small and medium-sized enterprises that are engaged in the restoration and repair of various surfaces of large-sized products. Thus, the development of the domestic machine-tool industry makes the development of various designs of mobile machine tools relevant for the purpose of import substitution in the Russian machine-building industry. This paper presents the design of a mobile boring machine that performs the processing of internal surfaces according to the control program with the required accuracy through the use of servo motor drives. Additionally, an engineering analysis of the structure is performed using the finite element method

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The repair of large-sized products without a specialized repair facility is usually not available due to the impossibility of ensuring high accuracy when performing mechanical processing. Nevertheless, dismantling and moving large-sized items to the repair facility significantly increase the downtime of the equipment being repaired, or it is technically impossible to perform. Specialized machines that are used to repair large-sized items in such facilities are unique and expensive. They are heavily loaded and this can lead to various risks associated with the timing of the repair. Therefore, it is necessary to reduce the time required for dismantling, moving and processing large-sized items. In this regard, the rejection of these operations in favor of the use of mobile machines will significantly reduce the time and cost of repairs of large equipment. The article discusses domestic and foreign achievements in the field of mobile machines and systems that are used for maintenance and machining of large-sized products on site without dismantling. A number of designs of specialized mobile machines for use in various industries are described.

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