New sulphiding method for steel and cast iron parts

Martsynkovskyy, Vasyl; Гапонова, О. П.; Коноплянченко, Євген; Dovzyk, M; Tarelnyk, Viacheslav; Gorovoy, S

doi:10.1088/1757-899x/233/1/012049

Cited by 30 publications

(6 citation statements)

References 5 publications

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“…In addition, it should be noted that the issue of increasing the durability of parts does not lose its relevance. To achieve this goal, paper [4] developed a fundamentally new method of sulfidation of surfaces by EDM doping; [5] -a technique for strengthening surfaces with cementation and nitriding; [6] -a procedure of coating with EDM doping. During the analysis of literary sources, it was found that it is proposed to increase the wear resistance of parts by strengthening their surface layer, which is a rather costly process.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Construction of spherical non-circular wheels formed by symmetrical arcs of loxodrome

Kresan

Ahmed

Pylypaka

et al. 2023

EEJET

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Bevel gears are used to transmit torque between intersecting axes. They demonstrate high reliability and durability of work, as well as a constant gear ratio. The disadvantage of such a transmission is the mutual sliding of the surfaces of the teeth of the gears, which leads to the emergence of friction forces and wear of their working surfaces. In this regard, there is a task to design such bevel gears that would have no slip. Non-circular wheels are understood as a pair of closed curves that rotate around fixed centers and at the same time roll over each other without sliding. They can serve as centroids for the design of cylindrical gears between parallel axes. If the axes of rotation of the wheels intersect, then the gears are called conical. An analog of gears between parallel axes, in which centroids are flat closed curves, for gears with intersecting axes are spherical closed curves. For a bevel gear with a constant gear ratio, such spherical curves are circles on the surface of the sphere, and with a variable gear ratio, spatial spherical curves. This paper considers the construction of closed spherical curves that roll around each other without sliding when they rotate around the axes intersecting in the center of the spheres. These curves are formed from symmetrical arcs of the loxodrome, a curve that crosses all the meridians of the ball at a constant angle. This angle should be 45°, which ensures the intersection of the loxodrome at right angles. Analytical dependences have been derived underlying the calculations of profiles of spherical non-circular wheels and their visualization by means of computer graphics. The results could be used to design non-circular wheels for textile machines, hydraulic machine pumps, pump dispensers, etc.

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Construction of spherical non-circular wheels formed by symmetrical arcs of loxodrome

Kresan

Ahmed

Pylypaka

et al. 2023

EEJET

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“…It is known that scientists pay a lot of attention to the issues of wear resistance and durability of parts. Thus, work [4] proposes a new technique to sulfide the surfaces of parts with electrical discharge machining; paper [5] outlines a way to strengthen the surfaces of thermally treated steel components, including cementation and nitriding processes. The authors of [6] devised a technique to increase the reliability and durability of metal surfaces of parts by applying a multilayer coating using electrical discharge machining.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Designing an outer toothed gear whose wheel teeth are outlined by the logarithmic spiral arcs

Pylypaka

Kresan

Volina

et al. 2021

EEJET

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Toothed gears are the most common mechanical gears in machine building, which are characterized by high reliability and durability, a constant transfer number, and which can transmit high torque. During toothed gear operation, the surfaces of the teeth slide, which gives rise to friction forces and wears their working surfaces. To prevent this, the surfaces of the teeth need constant lubrication. This paper considers the design of a gear tooth engagement, which does not have friction between the surfaces of the teeth since they roll over each other without slipping. The profile of the tooth of such a gear is outlined by congruent arcs, symmetrical relative to the line that connects the center of rotation of the toothed wheel with the top of the tooth. These symmetrical curves at the top of the tooth intersect at the predefined angle. In the depressions of the wheel, adjacent teeth also intersect at the same angle. Such a condition can be ensured by a curve that at all its points crosses the radius-vector emanating from the coordinate origin, also at a stable angle equal to half of the given one. This curve is a logarithmic spiral. If the number of teeth of the drive and driven wheels is the same, then their teeth are congruent. Otherwise, the profiles of the teeth would differ but they could be outlined by congruent arcs of the same logarithmic spiral of the same length taken from different areas of the curve. The minimum possible angle at the top of the teeth is straight. At acute angle, the toothed gear operation is impossible. To build gear wheels with a right angle at the top of the tooth, it would suffice to set the number of teeth of the drive and driven wheels. The center-to-center distance is calculated using the derived formula. The transfer number of such a gear is variable but, with an increase in the number of teeth, the range of its change decreases. The algorithm of wheel construction is given.

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“…MSD elements can be metallic, non-metallic, and combined [33][34][35], affecting cutting tools and cutting modes in machining MSD parts. According to the crosssectional shape of the separation channels, MSD is divided into three categories: round parts, flat parts, and complex parts.…”

Section: Design and Technological Classification Of Modular Separation Devicesmentioning

confidence: 99%

Classification of Separation Equipment by Design and Technological Features

Иванов¹,

Pavlenko²,

Cagáňová³

et al. 2018

EAI Endorsed Transactions on Energy Web

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Production range increasing causes many obstacles to ensure the work of the chemical industry. Production must respond quickly to the slightest change and must be customer-oriented. Due to this, there is a general trend towards increasing production flexibility by introducing modular systems. Thus, there is a need to classify existing solutions to develop flexible systems based on them. The article contains the analysis of chemical industry development tendencies, a methodology of research of modular separation devices, and their classification by design and technological features. The study result is a design and technological classification with a code that can optimize various separation devices. As a result of experimental research, preliminary and acceptance tests of experimental samples, the main hydrodynamic and separation characteristics of modular separation devices and combined multifunctional separators are determined: hydraulic resistance 0.15-2.00 kPa for units and 15-30 kPa for devices; effective capture of particles from the size of 5 μm; efficiency of separate stages of modular separation devices is about 70-90 %; efficiency of combined multifunctional separators is approximately 99.5-99.9 %. The offered multipurpose separators equipped with dynamically regulated modular separation devices do not concede to world analogs by the main technical characteristics of combined multistage separators worldwide.

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New sulphiding method for steel and cast iron parts

Cited by 30 publications

References 5 publications

Construction of spherical non-circular wheels formed by symmetrical arcs of loxodrome

Construction of spherical non-circular wheels formed by symmetrical arcs of loxodrome

Designing an outer toothed gear whose wheel teeth are outlined by the logarithmic spiral arcs

Classification of Separation Equipment by Design and Technological Features

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