Vol 6, No 2-2 (2012)

This paper presents an experimental investigations of alloying elements and structure influence on the physico-mechanical properties of ceramic-metal tungsten alloy with the addition of nonstoichiometric compounds of rare-earth metals. The paper illustrates the application of tungsten alloys with yttrium oxide as a material for high-loaded contact of ignition internal combustion engines system.

Used automotive catalysts are the major sources of secondary precious metals. The analysis of hydrometallurgical and pyrometallurgical technologies of extracting the precious metals from disposed automotive catalysts was made. The reasonability of use for utilization of new catalyst generation on metal transmitter of collector melting in plasma-arc furnace using self-generated steel manifold is introduced. We have outlined the directions of research works on a substantiation of process of autocatalysts utilization parameters.

The paper considers the ways of product processing with nanoscale accuracy using small-sized cutting tools with mechanical fixing of cubic boron nitride plates.

The creation of fundamentally new engineering products is impossible without materials, whose characteristics are many times higher than the world average. However, the traditional technologies of hardening materials have exhausted their potential. The output from the impasse of technology is based on using possibilities of nano-sized states of substance that was implemented on example of system of carbon-carbon. The proposed technology can be modified for creating of nanomaterials with characteristics that are many times higher than the achieved level of other chemical raw materials using gas-, liquid-and solid-phase crystallization processes.

During the production of castings there are often appear the problems connected with complexity of their manufacturing. They carry both technical, and economic character. As a rule, in conditions of production, these tasks are solved on the basis of the practical experience based on subjective character at their assessment. In this article authors, leaning on the principles which are put at the beginning of these works, offer a technique by determination of casting complexity, irrespective of a way of their manufacturing on constructive and technological parameters of a cast detail. Estimated criteria of their definition were developed for each of groups.

The article shows the peculiarities of diamond grinding of parts made of ceramic materials and proposed new directions of the research of improving the quality of ceramic details surfaces.

Analysis and evaluation of the sources of electromagnetic fields of the car will allow to solve a fundamentally new tasks on reduction of negative influence of these fields on humans and the environment.

The description of the semi-empirical models developed on the basis of results of theoretical and pilot studies is provided in article, for calculation of thermal offsets of spindle blocks at the most characteristic modes of operation of lathes.

Some features of the reducing of weight and size of high pressure vessels (HPV) with using of a thin-walled metal shell-liner from titanium alloy VT-1,0 are considered in this paper. The main difficulties are encountered under the manufacture of welded titanium alloy liner VT-1,0. There are presented the results of the selection of welding titanium alloy VT-1,0, shown the influence of technology of edge preparation on the quality of welded joints as well as the possibility of using laser welding technology in the liner of the VT-1,0.

Nowadays, when the production of cutting machines is realized by single or small-serial lots, the topical problem is the transition of base parts of machine-tools from cast to welded modification. However, the absence of experimentally-tested method, allowing to produce calculations and the optimization of welded base details, depending on particular conditions in every particular situation, suspends the process of their widespread introduction to machine-tool industry.

The article describes forming process when machining of a solid of revolution by external broach.

The aim of proposed approach is to reduce the cost and terms of products manufacturing by rational load of existing production systems while ensuring a given quality of manufactured products.

In this article there are considered the questions of efficiency of multi-axis milling of complicated spatial surfaces on CNC machines. The authors made the visualization of complex spatial surface in the CAD/CAM/CAE/DDM-system of SolidWorks.

The authors pointed out the main problems of production of solid carbide end tool and dependence on software-systems (PMC) of foreign suppliers. There are presented layout circuits, design and technological capabilities of CNC tool and cutter grinding machine.

The article examines the influence of errors caused by CNC machines on precision of milling small linear surfaces on the example of machining seats for inserts in the body of a tool holder.

The energy and resource economy are for many countries the key words in there live, which, in case of science, is the intelligence resource application, define the further way of development of technologies. The present paper reveals one of the energy efficient ways of science investigation in light construction of materials. The small hollow spheres made from different materials could change the weight of a construction part essentially, used as acoustic and thermal insulation and also as protection against vibrations and energy, induced by plastic deformation of material. They can be used as a unit cell for big parts and alone filled with an inert gas, e.g. fusion targets. The methods of their production could be divided in chemical, powder and metallurgical. The metallurgical method requires the intelligence application, because it is based on the own properties of the materials and boundary conditions of the process, not involving any organically core and preparation of the powder.

The paper presents a method of determining the reliability of the precision CNC lathes with the mutual influence of processes which reduce accuracy machining.

The article presents the results of multiple scanning through magnet control of ferroimpurities molding mixtures - in the implementation of large and very large number of control activities. There is detected the «break» each of the massively-operating characteristics of the control, which explain clearly illustrated narrowing of the spectrum of ferroimpurities operational size. the principal (which determines the objectivity of the data control) role of the second, functionally extrapolated sections of the specifications is shown and using the original settlement models quantitatively assessed.

In the paper there is investigated the cutting tool properties of high-strength composite ceramics with multi-coated cutting hardened steel. Mathematical models of cutting are obtained. They establish the dependence of the wear and tear on the back of the instrument, roughness of the machined surface of the parts, the tangent component of the cutting forces, as well as cutting power on the modes of turning. A problem of cutting tools modes optimization is made of high-strength composite ceramics. It is established that the application of the multi-functional coatings on ceramic cutting tool allows you to increase the efficiency of processing.

The article describes the multi-layered deformable materials, which can reduce the noise level. Possibility of deformation of multi-layer billets, which provide a high noise protection and noise insulation, is estimated.

Algorithm for solving the problem of profiling strip with pre-stamped technological groove hub is considered. In the course of deformation analysis of this technology bend in the place of localization and twisting of tuck shelves occurs. There are made comparisons of the calculated and experimental data.

The method of increase of wear resistance of metal-cutting tools by application of the activated air stream is offered. Results of researches of ozonized air influence on intensity of deterioration fast-cutting and hard alloy tools are presented

The article proposes an updated and expanded version of the previously proposed fractal multidimensional scale, allowing through the fractal dimension to regulate the mode of the dimensional electrochemical machining and evaluate the structural and dynamic characteristics of the processed surface.

The paper presents the development of layered composite material, which includes a carbide substrate, a ceramic layer and a nano-scale multilayered coating. Each element of a layered tool material fulfills individual functions. The carbide layer provides raised toughness and strength of tool material, the ceramic layer provides resistance of a tool material to oxidation, corrosion and high-temperature weakening at elevated temperatures, the nano-scale multilayered coating decreases thermal-mechanical stresses on the rake face of the tool and eliminates superficial defects of the ceramic.

The role and importance of non-traditional physical and chemical technologies in science-filled technique production are shown in this paper. The main directions of such technologies and its equipment development are formulized. The basic spheres of the application of electroerrosion, electrochemical and laser machining in the engine production are presented. Efficiency of such technologies using in order to solve new technological problems connected with stock removal nearby 1…30 μm in depth and surface roughness parameter less than Ra = 0,2…0,4 μm.

The article considers the preconditions for development of the criterial approach system for the choice of measurements means in designing and modernization of technological processes. Also, main spheres of measurement means parameters are chosen and explained.

The paper provides some general information and calculations of the chemical reactions of catalytic neutralization rate of exhaust gases, from which we can conclude that the temperature is the main parameter of exhaust gases process neutralization.

The paper presents the results of experimental and theoretical research of magnetic materials synthesized for use in the creation of functional radio electronics devices. Observations showed paramagnetic resonance, ferromagnetic resonance, resonance of the magnetostatic spin waves, nonresonant absorption of electromagnetic waves during the quasistatic magnetization reversal of the objects of research. According to the results of measurings of the observed physical phenomena were calculated studied magnetic materials characteristics; magnetization, anisotropy constants and so on.

The article develops approximate forecasting model assessments of fatigue life of power elements for the case of loading of stationary stochastic processes with the law of distribution ordinate different from the law of Gauss. The proposed predictive model is a correction of the Gaussian narrow-band model and can be used to obtain an express-assessment of the resource at the stage of elaborating the draft project of the loading of non-Gaussian processes.

The paper sets forth the method for constructing a robust control suspension of the automobile when there is an interval uncertainty of car cargo weight and drivers’ mass as well as the impossibility of measuring deviations of the car body and the driver's seat of their state of rest. The paper gives clear justification for the relevance of the application of synthesized robust control in comparison with other on the quality of the transient processes.

The article examines the relationship between the laws of the multiplication of vectors in the covariant Clifford algebra and Dirac matrices. The result is that spatial Dirac matrices are recorded in the form of a matrix structural permanent Clifford algebra over a geometric space. Spatio-temporal Dirac matrices represent the structural constants of the condensed Clifford algebra on the space-time. The structural constants are considered on the set of real numbers, complex numbers and quaternions.

The paper presents application of the theory of flow of the plastic layer between approaching surfaces of the tool body, modeling the processes of forming and molding of thin-walled structural elements. Within the simplified statement a boundary-value problem of the flow of a thin plastic layer shaped region composed of two different environments is formulated. The authors provide the precise solution of the problem with respect to the flow velocity and contact pressure. They derived the evolution equation for determining of the boundaries of spreading plastic layer. It is shown that the boundary wedge areas remain straight.

Generalized supplementary strain method efficiency is shown by beam elastoplastic torsion problem solving using BEM formulation. Dependence of convergence rate on modified shear modulus and on the twist angle was studied. Optimal choice of plasticity parameter leads to maximum convergence rate for this method.