Wear-Resistance Increase of Friction Surfaces of Steel Machine Parts by Electro-Mechanical Hardening

Gorlenko, Aleksandr; Davydov, S. V.; Shevtsov, M. Yu.; Boldyrev, D. A.

doi:10.3103/s0967091219110044

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…The driving gear of the transmission shaft of the pump performs the work that drives the pump (drilling rig). Therefore, to reduce energy consumption and improve the reliability of the pump it is necessary to investigate the principle of forces and stresses distribution in the kinematic relations of the gear shaft and gear wheel of the eccentric shaft of the pump [15][16][17][18][19][20]. The power of the gear and wheel was studied when determining the energy components of the pump in the interaction of the transmission and eccentric shafts.…”

Section: New Methods Developmentmentioning

confidence: 99%

Investigation of the Strength Parameters of Drilling Pumps during the Formation of Contact Stresses in Gears

et al. 2021

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The relevance of this research lies in the need to develop scientifically based methods for calculating and designing a transmission shaft with a hardened coating of increased strength and service life of a core drilling pump drive that can allow for a redistributing of resistance forces along the contact surfaces of the gear. This relevance is confirmed by the need to improve domestic methods for designing drive shafts of increased reliability which can ensure the development of frozen soils during deposits exploration. The purpose of the research is to increase the energy efficiency and service life of the high-loaded drive gear teeth of core drilling pump transmission shafts by justifying the critical loads and stresses in hardened gear coatings acting under intense wear of the contact surface with a broken contact symmetry. The criteria for the effective wear area with an uneven contact cross-section at the maximum bending moments of the transmission shaft of the drilling pump were justified and presented in the work. Additionally, the process of interaction of the transmission shaft gear teeth with the eccentric shaft gear at uneven axial torques was investigated. The effective power (Ng) of the gearing of the drive transmission shaft gear and the eccentric shaft gear, which characterizes the energy consumption of the drill bit depth stroke, was justified. This work also proposes a method of substantiating the technological and power parameters of the transmission shaft by using Legendre polynomials. A nomographic chart was developed for the determination of the dependence of the contact stress base cycles on the change in the load distribution factor and the contact spot deviation factor from the design axis λ.

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Section: New Methods Developmentmentioning

confidence: 99%

Investigation of the Strength Parameters of Drilling Pumps during the Formation of Contact Stresses in Gears

et al. 2021

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“…The cost of imported working bodies of road and mining machines exceeds USD 4087 per unit, with a service life of up to 6105 cycles. In our regions, the service life is reduced by two times, and the aggressive environment and climatic conditions make it more difficult to repair the equipment at a remove from mechanized repair shops, which leads to an increase in the cost of work, labor intensity and unit costs [14][15][16][17][18][19][20]. Research has established that the dynamics of the operating device, its trajectory and durability are affected not only by the rheology and mechanics of the soil but also by the design features and kinematics of the ripper [4,5].…”

Section: Research On the Effectiveness Of Frozen Soil Excavationmentioning

confidence: 99%

“…Examining the effective area of the tooth, its optimal profile was determined by decomposition in a row. Following Equation (19), it was established that the area S of the operating device depends only on the first Legendre coefficient d 0 . During mathematical research, it was established that any variation in the profile of the operating device provides equal areas.…”

Section: Mathematical Modelmentioning

confidence: 99%

Study of the Spatial Distribution of Forces and Stresses on Wear Surfaces at Optimization of the Excavating Part of an Earthmoving Machine Transverse Profile

et al. 2021

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The relevance of this research lies in the need to develop a scientifically-grounded methodology for designing the optimal profile of the contact frontal surface of an energy-efficient earthmoving machine operating device, which ensures the redistribution of resistance forces along the cutting elements during the excavation of frozen soil when extracting hydrocarbons. The relevance is confirmed by the need to improve domestic methods for designing the profiles of effective operating devices, ensuring the excavation of frozen soils during the laying of oil and gas pipelines and geological exploration in permafrost areas. Increasing the energy efficiency and service life of highly loaded ripper teeth is done by optimizing the geometric profile and designing a spatial shape that provides minimal resistance to cutting the soil. The object of the research is the process of dynamic interaction of the ripper tooth cutting profile with the frozen soil environment. The research method used was kinematic analysis and force calculation. The cyclic process of dynamic loading of the ripper operating device was investigated. The methodology of system analysis, as well as the method of distribution of resistance forces over the geometric elements of the cutting edge, were used. The mathematical apparatus has been effectively applied to establish the dependences of the change in energy and power properties on performance indicators, soil rheology, and dynamic loads of the ripper tooth. The process of interaction of the ripper tooth tip with frozen soil was investigated. A method for substantiating the design parameters of the operating device by using Legendre polynomials was proposed. Separate calculation results subject to the introduced restrictions were presented for the condition for solving the problem. The optimal parameters of the transverse profile of the contact frontal surface of the earth-moving machine operating device were determined taking into account the coefficient of reducing the fracture resistance of frozen soils.

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“…Improving the results of the cutting process can be implemented in several ways, mainly by changing the main parameters of the cutting process (e.g., velocity and feed) [1,2] or improving the tool design [3][4][5]. However, the most significant positive results can be achieved using the tool and structural materials from wear-resistant coatings with high physical, mechanical and chemical properties [6,7].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Wear Resistance for Multilayer Coatings Obtained by Nitrogenchroming

Pavlenko

Zajac

Kharchenko

et al. 2021

Metals

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This article deals with improving the wear resistance of multilayer coatings as a fundamental problem in metal surface treatment, strengthening elements of cutting tools, and ensuring the reliability of machine parts. It aims to evaluate the wear depth for multilayer coatings by the mass loss distribution in layers. The article’s primary purpose is to develop a mathematical method for assessing the value of wear for multilayer steel-based coatings. The study material is a multilayer coating applied to steel DIN C80W1. The research was performed using up-to-date laboratory equipment. Nitrogenchroming has been realized under overpressure in two successive stages: nitriding for 36 h at temperature 540 °C and chromizing during 4 h at temperature 1050 °C. The complex analysis included several options: X-ray phase analysis, local micro-X-ray spectral analysis, durometric analysis, and determination of wear resistance. These analyses showed that after nitrogenchroming, the three-layer protective coating from Cr23C6, Cr7C3, and Cr2N was formed on the steel surface. Spectral analysis indicated that the maximum amount of chromium 92.2% is in the first layer from Cr23C6. The maximum amount of carbon 8.9% characterizes the layer from Cr7C3. Nitrogen is concentrated mainly in the Cr2N layer, and its maximum amount is 9.4%. Additionally, it was determined that the minimum wear is typical for steel DIN C80W1 after nitrogenchroming. The weight loss of steel samples by 25 mg was obtained. This value differs by 3.6% from the results evaluated analytically using the developed mathematical model of wear of multilayer coatings after complex metallization of steel DIN C80W1. As a result, the impact of the loading mode on the wear intensity of steel was established. As the loading time increases, the friction coefficient of the coated samples decreases. Among the studied samples, plates from steel DIN C80W1 have the lowest friction coefficient after nitrogenchroming. Additionally, a linear dependence of the mass losses on the wearing time was obtained for carbide and nitride coatings. Finally, an increase in loading time leads to an increase in the wear intensity of steels after nitrogenchroming. The achieved scientific results are applicable in developing methods of chemical-thermal treatment, improving the wear resistance of multilayer coatings, and strengthening highly loaded machine parts and cutting tools.

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Wear-Resistance Increase of Friction Surfaces of Steel Machine Parts by Electro-Mechanical Hardening

Cited by 6 publications

References 2 publications

Investigation of the Strength Parameters of Drilling Pumps during the Formation of Contact Stresses in Gears

Investigation of the Strength Parameters of Drilling Pumps during the Formation of Contact Stresses in Gears

Study of the Spatial Distribution of Forces and Stresses on Wear Surfaces at Optimization of the Excavating Part of an Earthmoving Machine Transverse Profile

Estimation of Wear Resistance for Multilayer Coatings Obtained by Nitrogenchroming

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