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Bulletin of the Siberian State Industrial University

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No 4 (2015)
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Metallurgy and Materials Science

3-5 5
Abstract

The production of raw pellets on a plate pelletizer using the forced nucleation technology includes two main stages: the formation of embryos in a shape close to a cube and the creation of a pellet shell by pelletizing them in the working area of ​​the pelletizer. For pelletizing, it is necessary to organize a rolling mode, which for cubic embryos should be implemented on a pelletizer with certain operating parameters: the angle of inclination of the plate to the horizon and its rotation frequency. The stability of the rolling mode is ensured by the absence of embryo sliding on the charge skull (CS) during pelletizer operation. Therefore, along with the specified parameters, an additional factor can be used that affects the stability of the rolling mode and pelletizing of embryos, which can be the coefficient of friction of the embryos on the charge skull. This parameter can be influenced by changing the humidity and density of the pelletizer's skull charge.

6-8 4
Abstract

Steels with a bainitic structure are currently widely used in the automotive industry, in the energy sector, in the production of rails, high-strength pipes for the oil and gas industry and many other industries. Bainite is perhaps the most complex structure formed in carbon steel during heat treatment. This is due to the bainitic transformation process occurring in the temperature range where there is no diffusion of iron atoms and alloying elements, but an intensive redistribution of carbon atoms occurs. These processes lead to the formation of phases that differ significantly in carbon content: α-phase (solid solution based on the BCC crystal lattice of iron); γ-phase (solid solution based on the FCC crystal lattice of iron); carbide phase (cementite). The use of products made of steel with a bainitic structure (especially under extreme conditions) often leads to plastic deformation of the material, accompanied by a transformation of its phase composition and defect substructure.

9-11 10
Abstract

A comprehensive technology for producing intermetallic coatings on the surface of metals with high thermal and electrical conductivity but low wear resistance, developed at the Volgograd State Technical University, includes the following sequential operations: explosion welding of multilayer blanks made of initial ductile metals that form intermetallic phases upon interaction; their subsequent shaping by pressure treatment, which allows obtaining products of the required geometric shape; heat treatment (HT) under contact melting conditions to form a multilayer (matrix ‒ intermetallic) or homogeneous structure with a given chemical and phase composition at the interlayer boundaries.

12-16 4
Abstract

The hermetic connection of dissimilar vessels and pipes is often carried out by means of thin-walled composite adapters, in which, under the action of the working internal pressure, biaxial tension occurs and the effect of contact hardening is realized. This effect consists in an increase in destructive stresses due to the restraint of radial deformations of the soft interlayer at the boundary with the hard metal and the tightening of the stress state of the interlayer.

Mining and Geotechnology

17-21 6
Abstract

In foreign practice, the use of concrete blocks in combination with various means of mechanization of their laying is quite common for the rapid construction of mine bulkheads. To assess the ability of such a structure to resist the impact of a shock air wave (SAW), the stress-strain state of block bulkheads was simulated using the finite element method at a static pressure of 0.3 MPa. The Aurora Z88 software package with the corresponding model of the bulkhead was used to perform the calculations. Hexahedron No. 1 was adopted as a volumetric finite element, which ensures the calculation of deformation and stress in space using linear shape functions. This element is transformable, therefore, it can have a wedge shape or even an oblique shape. The transformation is isoparametric. The bulkhead model is based on its division into elements represented by two types of materials - concrete (the body of the sides) and mortar filling the interblock joints.

22-26 4
Abstract

Near-boring pillars are the main element of the technology of coal seam development by longwalls in coal mines. Ensuring the stability of pillars with different mining and geological characteristics of seams and host rocks in a rapidly changing mining and technical situation requires the use of a scientifically based method for predicting the state of the stress-strain state of rock mass. The absence of a method for predicting changing parameters of the stress-strain state (SSS) of pillars intended for the protection of development workings, to a certain extent, creates difficulties in ensuring the safety of mining operations at the stages of design, construction and operation of mines.

26-30 1
Abstract

Rocks in their natural state, under the influence of cyclic geotectonic processes and alternating compression and tension deformations, undergo disintegration with the formation of a system of blocks whose boundaries are cracks. Lineaments that emerged during the previous geotectonic cycle can serve as channels for fluid migration from the earth's interior or be filled with mineral inclusions. In a structured block geomassif, in the process of step-by-step evolutionary change of the earth's interior under the influence of alternating stresses, new cracks are formed and grow with the intersection of lineaments of the previous geotectonic cycle. The above processes are a consequence of the manifestation of the general law of universal fractal divisibility of loaded solids and media. Thus, a coal-rock massif before the start of mining operations should be considered as a system of blocks whose boundaries are three-dimensional conjugated elements: damage, cracks, faults.

30-35 4
Abstract

The difficult economic situation that has developed in the economy of our country places increased demands on the efficiency and safety of coal mines. One of the conditions for efficient and safe mine operation is the use of optimal technological solutions for the construction and maintenance of mine workings. In recent years, steel-polymer anchor support has become widespread in the coal industry of various countries, including Russia: in Russia - from 60% (in the Pechora Basin) to 95% (in Kuzbass); in Germany - up to 60% (as part of combined support); in the USA - up to 100%.

Power engineering and electrical technologies

36-40 1
Abstract

One of the modern methods of obtaining reliable information about the current state of the enclosing structures of a building, which are designed to protect structures from the external negative impact of natural factors, is a thermal imaging survey. The results of such surveys indicate the quality of the construction and installation work performed. The problem solved by this method is to obtain an objective picture of the thermal insulation state of various elements of building structures. At present, traditional methods of conducting thermal imaging surveys are widely used. However, it is worth highlighting the following features: this is an express survey of problem points; the ability to identify critical situations during the operation of building structure elements.

41-45 2
Abstract

Utility services and enterprises is to provide heat to all residents during the cold season. However, there are situations when, it would seem, despite good preparation for the heating season in individual apartments with central heating, it never begins. There may be different reasons for this. The main one, most often encountered in houses built over 12 years ago, is the deposition of deposits in the heating system.

 

Architecture and construction

46-48 4
Abstract

Demographers predict that out of 7 billion people on the planet at the beginning of the 21st century, 5.5 billion will live in cities. Urbanization as an inevitable consequence of industrialization creates serious environmental problems, and the development of megalopolises brings changes in natural living conditions: air pollution, high noise levels, a world of stone and concrete, isolated spaces. All this leads to increased morbidity, negative shifts in the psyche of city dwellers.

Architecture and construction

49-51 4
Abstract

The problem of processing technogenic products and waste from industrial enterprises is especially relevant for the industrial Kuzbass. The use of secondary mineral resources to expand the raw material base of the region's construction industry is important not only from an environmental point of view, but also from an architectural and urban planning point of view. A large number of buildings and structures built during the periods of constructivism and modernism in the Kemerovo Region are devoid of decorative elements, have partially lost them and need to be updated, reconstructed, modernized and aestheticized.

Automation and information technology

52-56 4
Abstract

The programmable controller of the mine hoisting machine PZH-2 is designed for use instead of outdated devices for protection, parameter control and information display, used in hoisting installations in accordance with the Federal norms and rules in the field of industrial safety "Safety rules for mining operations and processing of solid minerals".

Ecology and rational use of natural resources

57-59 1
Abstract

For humans, the most important are two main types of habitat: natural (biospheric) and technospheric, which arose as a result of their impact. With the development of the technosphere, humanity has begun to see signs of an approaching catastrophe of a planetary scale. The coming global crisis is systemic in nature and is developing simultaneously in several directions. One of them is the technospheric safety of the biosphere. In order to regulate environmental pollution in order to almost completely protect human health, it is proposed to introduce the concept of environmental risk.

59-63 4
Abstract

Underground mining of coal deposits is complicated, along with other factors, by the growth of gas content in seams and host rocks, which hinders coal production, increases its cost, and creates a threat to the safety of miners.

64-68 1
Abstract

Ash and slag waste (ASW) from coal-fired boilers forms technogenic accumulations, which are a serious environmental problem. Considering that mechanical underburning in dense-bed furnaces can reach up to 20-40%, ash and slag waste becomes, to a certain extent, an attractive carbon-containing raw material - a fuel resource. Direct combustion of ash and slag waste in traditional furnaces (boilers) is practically excluded due to insufficient concentration of carbonaceous material, while the high content of residual carbon in ASW limits their use in the construction industry.

Responses, Reviews, Biographies

 
69-71 2
Abstract

On January 26, 2016, Alexander Markovich Glezer, Doctor of Physical and Mathematical Sciences, Professor, a leading scientist and leader of a scientific school in the field of studying and developing new generation multifunctional materials, turns 70.

 
72-73 2
Abstract

May 31, 2015 marked the 80th anniversary of the birth and more than 50 years of engineering, scientific and teaching activity of the famous scientist in the field of electrometallurgy and chemical electrothermy, Doctor of Technical Sciences, Professor Nikolai Filippovich Yakushevich.

 
74 3
Abstract

February 10, 2016 marks the 70th anniversary of the birth of Vladimir Ilyich Bazaikin, Doctor of Technical Sciences, Professor of the Department of Higher Mathematics.



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ISSN 2304 - 4497 (Print)
ISSN 2307-1710 (Online)