Region for extrolling feasibility and effective deformation modes

Фастыковский, А. Р.

doi:10.3103/s1067821211030084

Cited by 4 publications

(1 citation statement)

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“…Such combined processes are often able to overcome the disadvantages of the simple processes that make up them. So, in recent years, several combined processes have been developed, which are based on the ECAP principle [1][2][3][4][5]. Each of these processes can significantly increase the productivity of the deformation process by annihilating certain ECAP disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Deformation of Bimetallic Wire During Combined Ecap-Drawing

Volokitina

Volokitin

Naizabekov

et al. 2020

METAL 2020 Conference Proeedings

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In modern industry the most urgent problem is to increase the physical and mechanical properties of metal materials. One of the promising ways to improve such properties is to grind the elements of the grain structure to an ultrafine-grained (UFG) state. From all methods used to produce metal materials with ultrafine-grained structures, the most commonly severe plastic deformation (SPD) methods are used. Most of the currently existing methods of the SPD implementation have not been used in the real industrial sector due to the existing in this method of deformation of the disadvantage, which is the discreteness, i.e. the inability to process products of relatively long length and the need for a large number of processing cycles. And this determines the economic inexpediency of the introduction of this method in production. To solve these problems, technology of combined deformation "ECAP-drawing" have been developed. This work is aimed to investigation of bimetallic wire deformation during combined ECAP-drawing. Results of strain state study showed that layers of materials in the cross-section of wire have received different values of strain. Stress state of both materials is various in both deformation zones -in the ECAP matrix deformation area is divided for two sections (tension and compression) separated by diagonal. At all deformation stages the level of compressive stresses is much higher of tensile stresses.

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Section: Introductionmentioning

confidence: 99%

Deformation of Bimetallic Wire During Combined Ecap-Drawing

Volokitina

Volokitin

Naizabekov

et al. 2020

METAL 2020 Conference Proeedings

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Prospects for Use of the Reserve Forces of Friction on Contact Surface in Deformation Zone at Rolling to Increase Process Efficiency

Фастыковский

Bazaikin

Evstifeev

2019

Izv. vysš. učebn. zaved., Čern. metall.

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Rolling process is carried out due to power supplied to the center of deformation using contact friction forces. Rolling takes place in two stages – the capture stage and the steady-state process. The capture stage determines possibility of deformation in rolls. During this period, retracting forces of friction are used with maximum efficiency. The main stage of rolling is the steady-state stage of the process, where contact friction capabilities are not fully used and reserve of friction forces is created, which can increase efficiency of rolling process. To balance excessive friction forces on contact surface in deformation zone during the steady-state process, zones of advance and adhesion appear. Their length characterize amount of excessive friction forces. Theoretical dependences for determining slip and adhesion zones are given taking into account variety of rolling factors. Estimation indicator of abilities of friction forces reserve at the steady-state stage is offered as well as dependence for its definition. It is analytically established that in steady-state stage of rolling on smooth rolls with ratio α/μз = 1 it is possible to supply 1.7 – 2 times greater energy due to exis ting reserve of friction force than at the stage of capture at a lower ratio α/μз ; these numbers are even higher for rolling on grooved rolls. Dependence which determines amount of additional power provided by friction forces reserve is given. Promising directions of using friction forces reserve at the steady- state stage of rolling are provided to improve its efficiency. On the example of rolling in drive – non-drive stand, an increase in efficiency (Efficiency Ratio) of the main line of rolling mill is established with more efficient use of friction forces at the steady-state stage of rolling process. Theoretical dependences are given to determine Efficiency Ratio at usual rolling process and at more full use of friction forces reserve.

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Reserves for reducing energy consumption when rolling section bars on modern rolling mills

Fastуkovskii,

Glukhov,

Vakhrolomeev

2023

Izv. vysš. učebn. zaved., Čern. metall.

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Metallurgical production is a highly energy-intensive process, and the search for solutions to reduce energy costs remains an urgent task for all stages. In this regard, the production of finished rolled products is considered as the most promising direction for the implementation of energy-saving technologies. There are two ways to reduce energy costs in hot rolling of section bars: saving energy for heating and improving the use of the main equipment to reduce intermediate energy costs. Due to the difference in silt conditions at the moment of capture and at the steady stage of the rolling process, a reserve of retracting friction forces arises, which can be used for additional shaping in non-drive devices and thereby increase the efficiency of the main equipment and reduce overall energy costs. For the practical implementation of the proposed concept, dependence was obtained that makes it possible to estimate the power potential that is not used at the steady stage of the rolling process. Using the obtained dependence, it was found that when rolling in smooth rolls, the potential of friction forces is used only by 50 – 60 %, and when rolling in calibers, by 35 – 40 %. It was experimentally established that during the rolling of shaped sections in passes with an elongation ratio of less than 1.10 – 1.15, more than 50 % of the energy is spent on idling. However, by replacing drive stands in these passes with non-drive cassettes (in continuous groups), it is possible to increase the efficiency of adjacent stands by 4 – 5 % and reduce energy costs.

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Region for extrolling feasibility and effective deformation modes

Cited by 4 publications

References 0 publications

Deformation of Bimetallic Wire During Combined Ecap-Drawing

Deformation of Bimetallic Wire During Combined Ecap-Drawing

Prospects for Use of the Reserve Forces of Friction on Contact Surface in Deformation Zone at Rolling to Increase Process Efficiency

Reserves for reducing energy consumption when rolling section bars on modern rolling mills

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