METHOD OF CALCULATING THE DYNAMIC LOADS FROM THE AFTER-EFFECTS OF SHOCK CAPTURE OF METAL BY ROLLS OF BLOOMING MILL

NATRIASHVILI Tamaz M., D. Sc. in Eng., Prof., Director, Institute of Machine Mechanics named Rafael Dvali, Tbilisi, Georgia, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

MEBONIA Slava A., D. Sc. in Eng., Assoc. Prof., Head of the Department of Mechanical Engineering, Institute of Machine Mechanics named Rafael Dvali, Tbilisi, Georgia, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

The method of determining the force factors from the dynamic aftereffect of the shock at capture of metal by rolls of  blooming mill is introduced. The differential equations of motion for the main line of the blooming mill are composed taking into account the forces of the shock interaction taking place when the metal is captured by rolls of  the mill. By  solving these equations, the formulas for calculating the dynamic moments of the elastic forces acting in the details of the main line of the blooming mill are obtained. Analysis of the formulas shows that the value of  the  dynamic moment acting on the spindle shafts of the main line of the blooming mill depends on the elastic-mass parameters of  the elements of the main line, as well as the amplitude and frequency of the shock pulse.

shock interaction, dynamic aftereffect, elastic moment, amplitude, frequency

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DEVELOPMENT OF OPERATIONAL CARD OF ROLLER BRIQUETTE PRESSES TIRES

BAIUL Konstantin V., Ph. D. in Eng., Senior Researcher, Z.I. Nekrasov Iron & Steel Institute of the National Academy of Sciences of Ukraine, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

VASHCHENKO Sergey V., Ph. D. in Eng., Senior Researcher, Z.I. Nekrasov Iron & Steel Institute of the National Academy of Sciences of Ukraine, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KHUDYAKOV Alexander Yu., Ph. D. in Eng., Senior Researcher, Z.I. Nekrasov Iron & Steel Institute of the National Academy of Sciences of Ukraine, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

The form of the operational card of the set of tires of a roller briquette press is proposed. A specific example shows application of the operating card for selecting rational briquetting modes and accumulating the actual data on the  modes and operating conditions of tires when briquetting a charge with varying physical and mechanical properties taking into account tires wear. The application of the created operational card is the basis for development of system of scheduled maintenance of the pressing equipment and rational methods of restoring working surfaces of the worn tires of the roller briquette presses.

roller briquette press, tires, operational card

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3. Vashchenko S.V., Maymur B.N., Petrenko V.I., Baiul K.V., Khudyakov A.Yu., Solodkaya N.A., Prokudina  E.B. Issledovanie usloviy i mekhanizmov formirovaniya prochnostnykh svyazey v  pressovkakh pri briketirovanii melkofraktsionnykh shikhtovykh materialov [Research of the conditions and mechanisms of strength formation in compacts during briquetting of fine-fraction materials]. Fundamentalnye i prikladnye problemy chernoy metallurgii [Fundamental and  applied problems of ferrous metallurgy], 2015, no. 30, pp.   347–362.
4. Khudyakov A.Yu., Vashchenko S.V., Baiul K.V., Semenov Yu.S. Briketirovanie kaolinovogo syrya dlya proizvodstva kuskovogo shamota [Briquetting of kaolin raw materials for the production of lump chamotte]. Novye ogneupory [New refractories], 2018, no. 8, pp. 14–20.
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6. Maymur B.N., Petrenko V.I., Lebed A.T. Sovershenstvovanie konstruktsii i uluchshenie ekspluatatsionnykh kharakteristik valkovykh briketnykh pressov [Improving design and performance characteristics of roll briquetting presses]. Chernaya metallurgiya. Byulleten nauchno-tekhnicheskoy i ekonomicheskoy informatsii [Ferrous metallurgy. Bulletin of scientific, technical and economic information], 2011, no. 12, pp. 67–71.
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TECHNIQUE OF STRUCTURAL SYNTHESIS OF STATICALLY DETERMINABLE PARALLEL STRUCTURE MECHANISMS OF TECHNOLOGICAL ROBOTS

TOLSTOSHEEV Andrey K., Ph. D. in Eng., Assoc. Prof., Associate Professor of the Department “Machine Parts”, Bryansk State Technical University, Bryansk, Russia, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

TATARINTSEV Vyacheslav A., Ph. D. in Eng., Assoc. Prof., Associate Professor of the Department “Machine Parts”, Bryansk State Technical University, Bryansk, This email address is being protected from spambots. You need JavaScript enabled to view it.">Russia, This email address is being protected from spambots. You need JavaScript enabled to view it.

The article is devoted to improving the reliability and manufacturability of technological robots with parallel kinematics by replacing statically indeterminable manipulators with statically determinable mechanisms. The  technique of  structural synthesis of statically definable manipulators by modifying the structure of the prototype is proposed. The  procedure involves identifying and eliminating redundant links, checking the solution. To determine the number of degrees of freedom of the mechanism, identify redundant links and verify the solution, the authors use the proposed methodology of structural analysis. In structural analysis, a manipulator is represented by a  hierarchical structure and is considered as a parallel connection of elementary mechanisms with an open kinematic chain; as a kinematic chain consisting of leading and driven parts; as a set of links and kinematic pairs; as a kinematic connection of  the output link and the rack. The article implements the following techniques for eliminating redundant links: mobility increase in kinematic pairs; introduction of unloading links and passive kinematic pairs to the kinematic chain; exclusion of extra links and pairs from the kinematic chain; increase in mobility in some kinematic pairs simultaneously with the exclusion of other kinematic pairs that have become superfluous. The authors developed several variants of  structural schemes of self-aligning manipulators based on the Orthoglide mechanism. The  proposed technique allows to  determine the number of degrees of freedom of the mechanism, the number and type of redundant links, eliminate redundant links and, on an alternative basis, build structural diagrams of statically determinable mechanisms of technological robots with parallel kinematics.

technological robots, parallel kinematics, redundant links, statically definable mechanisms

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9. Podzorov P.V., Bushuev V.V. Strukturnyy analiz i klassifikatsiya mekhanizmov parallelnoy kinematiki [Structural analysis and classification of mechanisms of parallel kinematics]. Mekhatronika, avtomatizatsiya, upravlenie [Mechatronics, automation, control], 2004, no. 10, pp. 42–49.
10. Glazunov V.А., Borisov V.А. Razrabotka mekhanizmov parallelnoy struktury s chetyrmya stepenyami svobody i chetyrmya kinematicheskimi tsepyami [Development of mechanisms of parallel structure with four degrees of freedom and four kinematic chains]. Problemy mashinostroeniya i nadezhnosti mashin [Journal of machinery manufacture and reliability], 2017, no. 5, pp. 3–12.
11. Tolstosheev А.K., Tatarintsev V.А. Strukturnyy analiz mekhanizmov robotov-stankov s parallelnoy kinematikoy [Structural analysis of robot machine mechanisms with parallel kinematics]. Vestnik Bryanskogo gosudarstvennogo tekhnicheskogo universiteta [Bulletin of the Bryansk State Technical University], 2017, no.   1(54), pp. 33–43.
12. Tolstosheev А.K., Tatarintsev V.А. Metodika strukturnogo analiza parallelnykh manipulyatorov selskokhozyaystvennykh robotov [Method of structural analysis of parallel manipulators of agricultural robots]. Nauchnoe obozrenie [Science review], 2017, no. 22, pp. 37–42.
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DESIGN AND WORKFLOW FEATURES OF UNIT OF INTERACTIVE CLUTCHES OF HYDROMECHANICAL TRANSMISSION

BELABENKO Dmitriy S., Head of the Hydromechanical Transmission Division, JSC “Minsk Wheel Tractor Plant”, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

A review of clutches related to the type of tandem friction clutches is presented. The known solutions, disadvantages and advantages of the double friction clutch, which includes two control elements having a hydraulic connection between the hydraulic cylinders, are analyzed. The studies that have examined the clutches are analyzed. A typical block diagram of the mechatronic control system and the vehicle is drawn up, with the help of which studies of the shift process are carried out in the general case. In the analyzed studies, the simulation was carried out taking into account not all elements of the block diagram. There are three diagrams on the basis of the use of circuit elements in modeling. The  rational configuration of the elements for the study was chosen. The results of study are presented in the article. The  dynamic scheme of double friction clutch hydraulic drive and its mathematical model with introduced hydraulic connection between hydraulic cylinders are developed. The mathematical model uses the values of the stiffness of the elastic elements: the springs, friction discs, thrust disc. The stiffness of the thrust disc, which is part of a complex assembly unit, is determined by the calculation of the finite element method. The mathematical model of the hydraulic drive contains differential equations that retain their appearance for all positions of the piston.

clutch, double friction clutch, hydromechanical transmission, dynamic diagram, mathematical model

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