Prediction of operability of the plate rolling rolls based on the mixed fracture mechanism

Belodedenko, S.; Grechany, Alexey; Yatsuba, Andrey

doi:10.15587/1729-4061.2018.122818

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…The limits of endurance before the appearance of crack σ R , expressed by the maximum conditionally elastic stresses of the cycle, increase by about 20 %. For example, for the steel 40H, there is an increase in durability, practically, by an order of magnitude, during the transition from γ L = 2 to γ L = 1 (17).…”

Section: Discussion Of Results Of Fatigue Tests When Varying the Mult...mentioning

confidence: 99%

“…Dangerous BS sites suffer from cyclical normal and tangent stresses. At the stage of growth of the defect, such conditions provoke the destruction of a mixed type when, at the same time, modes I, II, and III are observed [17]. For mixed destruction, some authors devised the so-called pure modes method, which was used to assess the survivability of sheet rolls, as well as the beds of cages in a pipe-rolling unit [3].…”

Section: Justifying the Model Of Durability With Multi-axial Fatigue ...mentioning

confidence: 99%

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Estimating the residual resource of basic structures using a model of fatigue durability under complex loading

Belodedenko

Hrechanyi

Hanush

et al. 2022

EEJET

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This paper reports the construction of a durability model of basic structures, which takes into consideration the complex stressed state under the cyclic action of the complex load. The models that take into consideration this factor are categorized on the basis of equivalent for a certain indicator of the stressed-strained state. The equivalence models based on the tangent stresses and strains have been recognized as the most effective ones. However, they hold when the ratio of the limits of fatigue under tangent and normal stresses exceeds 0.5. In addition, determining the latter requires specific testing equipment. The concept of basic bearing structures for industrial equipment has been formulated. The issue related to the multi-axis fatigue of basic structures was considered from the standpoint of combining the reliability indicators of systems. The durability model has been derived from the rule of combining resource safety indices. The load is represented as a combination of individual subprocesses of simple types of deformation with their amplitudes and asymmetries. A model of durability with multi-axis fatigue has been built, which takes into consideration the parameters of the form of the strain cycle, and the type of process (synphase, disproportionate, unchanging static stress). The possibility of obtaining parameters for the multi-axis fatigue model during tests for three-point bending under conditions of varying the multiplicity of the span has been confirmed. According to this scheme, fatigue tests of prismatic samples of the steels 09G2 and 40X were carried out. For them, the parameters of fatigue resistance were found; additionally, the ratio of the fatigue limit for tangent stresses of displacement and fatigue limits for normal bending stresses, which is equal to 0.385, was established. A test procedure has been devised to determine the initial data for the multi-axle fatigue model, which is suitable for conventional test machines and simple-shape samples. The latter advantage is important precisely for basic structures, from fragments of which it is difficult to fabricate a sample of a complex shape

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Section: Discussion Of Results Of Fatigue Tests When Varying the Mult...mentioning

confidence: 99%

Section: Justifying the Model Of Durability With Multi-axial Fatigue ...mentioning

confidence: 99%

Estimating the residual resource of basic structures using a model of fatigue durability under complex loading

Belodedenko

Hrechanyi

Hanush

et al. 2022

EEJET

Self Cite

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“…where V -winding's speed (linear); , kg/m (3) where ρ -density of the material of the winding billot;…”

Section: Statement Of the Main Research Materialsmentioning

confidence: 99%

Simulation Modeling in the Research of Metallurgical Equipment Operation

O.M.,

T.O.,

A.O.

et al. 2024

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Rolling production refers to the final link of the metallurgical cycle, the quality of products shipped to the consumer depends on the consistency of the work of all units. The wear and tear of the main production facilities of enterprises of the metallurgical complex requires not only updating, but also constant modernization of dated equipment in the conditions of active production. The main equipment of the production lines of wide-scale rolling mills includes coilers, the quality of which depends not only on the rhythm of the rolling equipment, but also on the quality of the material shipped to the consumer. Simulation modeling of the winding process of hot-rolled billot made it possible to establish the possibility of torsional oscillations in the coiler drum drive. Further analysis of the form of the resulting oscillations made it possible to establish that the elastic deformations from the resistance forces of the electric motor and the rotating parts of the coiler drum are in antiphase. The performed calculations create prerequisites for the study of forced oscillations occurring in the coiler drum drive.

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“…The use of planetary mechanisms in the drives of the press allows for an unchanged number of strokes of the press to reduce several times the energy consu mption for activation [1], to increase the number of revolutions of the flywheel, which leads to a significant reduction in its moment of inertia and, consequently, in size and weight [2]. Since the friction units of all planetary gearboxes act as brakes, the working conditions of which are more favorable to the friction clutches, which leads to an increase in the service life of friction elements, the cycle between repairs of the press and, subsequently, improves the press reliability and durability [3].…”

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confidence: 99%

The Influence of Configuration Parameters of the Planetary Drive of Crank Presses on its Dynamic and Energy-Consumption Characteristics

2023

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Introduction. The planetary drive has been widely found in the activation systems of crank presses as it improves working conditions of friction units and reduces press metal consumption and energy consumption.Problem Statement. For studying the planetary motion of its main parts, it is advisable to consider its operation as four periods characterized by different patterns of changes in external loads and, consequently, different patterns of motion of core parts. The periods between switching the brakes when one link has not stopped, while other one starts moving is of the greatest interest. The problem of dynamic and energy-consumption parameters of the drive in transient conditions still remain a little open.Purpose. The purpose of this research is to qualitatively assess the influence of configuration parameters on the dynamics of the processes of switching and stopping the planetary drive.Material and Methods. The parameters of the experimental pilot plant, a model planetary drive with a nominal load of 400 kN, have been calculated. The minimum speed of the central gear has been estimated depending on the moments of inertia of the leading mass and the outer gear. The obtained dependences have been processed with the use of a standard mathematical apparatus.Results. It has been found that the energy-consumption and dynamic parameters of the drive are significantly influenced by such characteristics as moments of inertia and braking moments, while decreasing angular velocity of the drive flywheel does not depend on the moments of inertia of the stopped links. The rate of braking processes is determined by the elastic properties of the friction materials and the parameters of the brake springs, not by the parameters of compressed air outflow.Conclusions. The obtained analytical and graphical dependences have allowed not only qualitative, but also quantitative assessment of the influence of the parameters on the dynamics of processes. These recommendations can be used at the design stage, to select the optimal parameters of the drive with the predicted properties.

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Prediction of operability of the plate rolling rolls based on the mixed fracture mechanism

Cited by 7 publications

References 6 publications

Estimating the residual resource of basic structures using a model of fatigue durability under complex loading

Estimating the residual resource of basic structures using a model of fatigue durability under complex loading

Simulation Modeling in the Research of Metallurgical Equipment Operation

The Influence of Configuration Parameters of the Planetary Drive of Crank Presses on its Dynamic and Energy-Consumption Characteristics

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