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Reliability of hydropneumodrives for metal cutting equipment
(Національний технічний університет "Харківський політехнічний інститут", 2023) Fatieieva, N. M.; Fatyeyev, O. M.; Poliakov, V. V.
The reliability of hydropneumodrives largely determines the safety of machine tools, metal cutting equipment, the movement of transport vehicles, and the flight of modern passenger aircraft, and their failures can in some cases lead to accidents. The design stage is crucial in ensuring reliability. The main tasks of reliability research and calculation at this stage can be divided into three groups. First, it is a justification of reliability requirements for the main elements of the hydraulic pneumatic actuator (the task of reliability norming). This task is solved at an early stage of design and involves the preliminary development of the unit structure and justification of design principles. Secondly, it is to ensure the reliability of the elements and the unit as a whole. This group of tasks includes research and quantitative assessment of the efficiency of possible ways to ensure reliability; selection of basic design characteristics, statistical reserves of durability and longevity, stability reserves and other indicators; comparative analysis of options and selection of optimal designs. Thirdly, these are control calculations of the unit's reliability according to the design documentation. Algorithms for the distribution of normalised reliability indices at the design stage for hydropneumodrives implemented by the standard positional structure method and the minimisation method are obtained. Algorithms allow already at the early stages of hydropneumodrive design to normalise reliability indices, which makes it possible to obtain optimal solutions of reliability issues at the subsequent stages of development of the drive life cycle. The methods of calculation and determination of design relations for finding quantitative characteristics of failure-free indices of designed hydropneumodrives, implemented by the method of standard positional structure and the method of minimisation, are selected, which allows designing highly reliable hydropneumodrives for new metal cutting equipment. Evaluation of reliability indicators of hydropneumodrives at the stage of preliminary design allows to make a rational choice of structural scheme and parameters, to select appropriate materials and elements of scheme realisations.
Technical diagnostics of hydraulic systems
(Національний технічний університет "Харківський політехнічний інститут", 2023) Fatyeyev, O. M.; Fatieieva, N. M.; Poliakov, V. V.
Advantages of using hydraulic equipment of modular mounting in the modernization of machine hydrosystems
(Національний технічний університет "Харківський політехнічний інститут", 2022) Fatieieva, N. M.; Fatyeyev, O. M.; Ponomarov, Vladyslav
With each passing year, automation schemes that use hydraulics are becoming more and more complex. With the large number of hydraulic devices in the scheme, replacing threaded connections with other methods of mounting becomes very important. The analysis of building and mounting of hydraulic drives and hydraulic units on the example of metal-cutting machines, namely: round saw and turret lathe. The analysis shows that the optimal variant of pipeless mounting of hydraulic drives is mounting with the use of modular and butt hydraulic equipment. The main advantages of modular mounting are: reducing the number of pipelines and their connections; increasing drive rigidity, reducing noise; compactness, small size and weight; reducing labor costs and time for design and manufacture of the drive; convenience of operation, the ability to quickly reconfigure the drive, replace the failed unit without disassembly of the hydraulic drive; unification of mounting plates and hydraulic panels; increasing their seriality. In addition, with this type of mounting, there is always a constant distance between the individual devices and regulating bodies of different apparatuses that make up a typical element of a hydraulic system (its structural contour). This makes it possible to determine in advance the characteristics, properties and "behavior" not of individual hydraulic apparatuses included in the hydraulic system of the machine drive, but of groups of apparatuses that make up typical modular units. We have an opportunity to judge the characteristics of the hydraulic drive of the machine as a whole already at the stage of its design by predetermined characteristics of typical elements (modular units) included in the hydraulic system of the machine, which will significantly reduce the time for designing, debugging and launching the drive in production. The group of metalworking equipment, in which the hydraulic drive on the basis of modular and butt hydraulic equipment is easily performed, includes: turning group machines; drilling and boring machines; grinding group machines; broaching machines; cutting machines, milling machines and other special machines. Justified selection of the nomenclature of normalized hydrostations, modular and butt hydraulic apparatuses and other unified elements can solve the problem of creating up to 70–75 % of the manufactured hydraulic drives completely based on unified units.

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