Vol 14, No 4 (2012)
- Year: 2012
- Articles: 14
- URL: https://ered.pstu.ru/index.php/mm/issue/view/296
- DOI: https://doi.org/10.15593/.v14i4
ARTICLES
RESEARCH OF INFLUENCE OF OSCILLATING OF THE ELECTRONIC BUNCH ON THE CHEMICAL COMPOSITION OF METAL OF THE WELD BEAD AT ELECTRON BEAM WELDING OF STEEL 12Х18Н10Т
Abstract
In article change the maintenance of alloying elements is investigated at evaporation from the pro-melting channel at electron beam welding of steel 12Х18Н10Т with an electron beam oscillating is investigated. Influence of focusing of an electronic bunch on change of a chemical composition of a welded seam when welding а with electron beam oscillating is considered. Research was carried out with use of a method of the spectral analysis.
Bulletin PNRPU. Mechanical engineering, materials science. 2012;14(4):7-14
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MATHEMATICAL SIMULATION OF STRESS-STRAIN STATE thin strip in the rolling
Abstract
On the basis of recurrent decision finite difference form of terms balance of power expenses and the terms of static and dynamic balance, examined within the framework of the selected elementary volumes, got by breaking up of area of plastic forming on its length, with the use of more correct forms of analytical definition of terms of external contact friction and condition of plasticity, the numeral mathematical models of local and integral adjectives of the deflected mode of metal at the hot rolling in relation to thin strips and bars got development in the finishing working train skelp and wide-strip rolling mill.
Bulletin PNRPU. Mechanical engineering, materials science. 2012;14(4):15-24
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Modeling of Hydrodynamic Phenomena in Reactor for Titanium Sponge Production
Abstract
A significant magnesium quantity is used in the reduction device for titanium sponge production. As a result of heating, significant convective flows are obtained in the melt. Flows recording is necessary for the technological process description. Mathematical model of the reactor for magnesium-thermal reduction of titanium tetrachloride is provided with mechanism, which allows accounting liquid magnesium hydrodynamics. Results of numerical modeling of hydrodynamic phenomena in melted magnesium during the reduction reactor heating are shown in the work.
Bulletin PNRPU. Mechanical engineering, materials science. 2012;14(4):25-33
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RESEARCH OF PROCESS ROLLING OF POWDER TIPES
Abstract
Mathematical modeling of the intense-deformed condition and behavior of firm particles of inclusion of the core is spent at a rolling of a powder tape; the probability of infringement of integrity of a metal cover for a case of introduction of idealized particles of the core in the form of a cone, a pyramid and a sphere is defined. From the practical point of view results of the automated designing of technological modes rolling allow to define without use of the developed mathematical apparatus all initial parameters of process for reception of the set standard size of a powder tape.
Bulletin PNRPU. Mechanical engineering, materials science. 2012;14(4):34-41
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THE APPLICATION OF RANQUE – HILSH EFFECT
Abstract
The history and application of Ranque – Hilsh effect in Russia and abroad are considered. The main conception of effect is presented. The two main cases of vortex motion are considered. The main design features are reviewed. The probability and special features of vortex tube application for gas separation are considered. The conclusions are made. Further investigations are described.
Bulletin PNRPU. Mechanical engineering, materials science. 2012;14(4):42-54
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Explosive fabrication of metalloceramics protective containers
Abstract
The possibility of using the explosive energy to create metalloceramics containers for the transport and storage of radioactive substances is presented.
Bulletin PNRPU. Mechanical engineering, materials science. 2012;14(4):55-60
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INTERRELATION OF COMPOSITION, STRUCTURE AND CHEMICAL PROPERTIES OF REFRACTORY INTERSTITIAL PHASES. PART II. THE NATURE OF CHEMICAL AND ELECTROCHEMICAL ACTIVITY OF THE REFRACTORY INTERSTITIAL PHASES IN MINERAL ACIDS
Abstract
The interrelation of composition, structure and chemical properties cubic (type NaCl) of refractory interstitial phases (RIP) is investigated. On an example of carbides, nitrides and monoxides of the titanium are discussed the regularities of manifestation of chemical and electrochemical activity of RIP in mineral acids (HCl, H2SO4, and HNO3). It is shown that chemical activity of RIP in mineral acids correlates with degree of their metallicity, and electrochemical – with degree of their ionicity. Experimentally demonstrated a genetic link between the chemical activity TiC, TiN and TiO in concentrated mineral acids and chemical activity of titanium metal.
Bulletin PNRPU. Mechanical engineering, materials science. 2012;14(4):61-72
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STRUCTURE OF THE SURFACE LAYER OF WORKPIECE IN THE PROCESSING OF WIRE-EDM
Abstract
Сhanges in the structure of the surface layer pieces with different coefficients of thermal conductivity after treatment on the wire-cut EDM machines are studied
Bulletin PNRPU. Mechanical engineering, materials science. 2012;14(4):73-76
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I-BAR STRENGTH COMPUTATION METHODOLOGY PERFECTION FOR TEACHING OF ENGINEERING DISCIPLINES
Abstract
The equivalent stress distribution along the height of an I-bar cross-section has been studied. The zones of maximum equivalent stress in conjunction with the I-bar geometric parameters and power load at the section have been found. The conditions for maximum equivalent stresses have been specified to not exceed the allowable values. An improved method for the comprehensive assessment of I-bar strength against the normal, tangential and equivalent stresses has been proposed. This computational approach may be recommended to lecturers and students of technical universities as well as engineering specialists in the field of strength computations.
Bulletin PNRPU. Mechanical engineering, materials science. 2012;14(4):77-90
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PROSPECTS OF WORKING OUT NEW HIGH TECHNOLOGY TECHNOLOGIES ON HERMETIC SEALING OF PRODUCTS ON THE BASIS OF ССМ
Abstract
The article is about new divisions of hermetization technologies of carbon-carbon composit details. There are: hermetization of carbon-carbon composit details by means of chemical vapour deposition of silicon carbide coating, decriasing of material permeability by means of siliconizing, production of hermetic carbon-silicon carbide composites by vapour-liquid siliconizing of carbon-carbon composite.
Bulletin PNRPU. Mechanical engineering, materials science. 2012;14(4):91-101
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THE FRACTRAL APPROACH TO THE ANALYSIS OF FEATURES OF WELD FATIGUE BREAKDOWN
Abstract
The fatigue fracture surface indicates breakdown features and it is a photo of breakdown history. In this paper efficiency of fractal analysis method application for the quantitative description of fracture geometry is shown, the interrelation between fractal dimension of a fracture surface and quantitative parameters of a fatigue resistance is ascertained. The determined interrelation enables to analyze the fatigue breakdown sources of multilayer welds.
Bulletin PNRPU. Mechanical engineering, materials science. 2012;14(4):102-107
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INVESTIGATIONS into a L-TYPE GATING SYSTEMS
Abstract
A laboratory L-type gating systems are described. Results of theoretical and experimental determination of liquid flow speed and rates depending on the relation area the feeder to area the collector and on the number of working feaders at the same time are given.
Bulletin PNRPU. Mechanical engineering, materials science. 2012;14(4):108-122
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THE PROJECTING OF PROFESSIONAL EDUCATION SYSTEM IN BASIC EDUCATIONAL PROGRAMS
Abstract
At the article the content of modules and the phases of the professional education system are presented. The model of structure-dynamic interrelation of elements of professional education system is developed. The model focuses on students of technical specialties.
Bulletin PNRPU. Mechanical engineering, materials science. 2012;14(4):123-128
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PRECONDITIONS PROJECTION CONTENTS OF GENERAL DISCIPLINE FOR TRAINING OF TECHNICAL DIRECTIONS STUDENTS
Abstract
The process of projecting professional cycle discipline’s content based on competence approach is described in the article.
Bulletin PNRPU. Mechanical engineering, materials science. 2012;14(4):129-133
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