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The subscription index of catalogue
“Russia press” - 18945 semi-annual,
15621 – annual.
It is issued in February 2004.
4 numbers a year
Mechanical engineering and engineering science
M.V. Zernin. HYBRID FINITE ELEMENT FOR SIMULATION
OF STRESS STATE AT CRACK TOP IN 3D BODIES
The peculiarities of a stress field and defor-mations at a crack top located in 3D bodies at complex stressed state are characterized. The requirements to a final element for the simulation of a singular field of stresses at the crack top are formulated. Basic correlations for the approximation of these parameters in a twenty-unit finite element of a three-dimensional problem are shown. Besides joint functions of the form there are introduced also singular functions of stresses and movements. Expressions for rigidity matrices of such a hybrid element are obtained. By a set of test examples there is shown a sufficient accuracy of such hybrid approximations at comparatively large finite element grids
Key words: stress intensity factor, finite element method, singular functions, hybrid finite element, hybrid approxima-tions, test problems
A.A. Nikonov, A.L. Kameneva.
MATHEMATICAL DESCRIPTION OF COMPLEX CUTTER
CUTTING EDGE AND UNIVERSAL PROCEDURE
FOR GEOMETRY COMPUTATION OF LAYER CUT
A problem of the pre-production of parts for oil producing equipment with longitudinal helical grooves under conditions of constant changes of their type di-mensions, a form and nominal dimensions is analyzed. A cutting edge of a planer tool with a specified profile is described mathematically. A universal procedure for the computation of the geometry of a layer cut allowing the geometry computation of a layer cut for any type dimension of grooves with a profile specified and for any moment of machining is developed.
A mathematical description of a cutting tool cutting edge allows carrying out a cutting edge geometry computation of a cutter with a specified profile on the basis of groove parameters and a pipe inner diameter.
A deduced system of parameter equations de-scribes mathematically a cutting edge of a cutter for machining a groove with a specified profile regardless of execution dimensions of a groove and an inner hole of the part worked.
It is established that the geometry of a layer cut at planning a groove at any moment may be described through nine schemes of a chip formation. The analyti-cal model choice is carried out with the aid of the de-veloped finders fr(A), fr(B). For all chip formation schemes there is obtained a mathematical description of the geometry of the layer cut.
The result may be used further for the automat-ed computation of a cutter profile and for automated computation of optimum cutting modes
Key words: machining, helical grooves, cutting edge geometry, geometry of layer cut
M.Yu. Kulikov, M.V. Yagodkin.
RELIABILITY INCREASE OF THREAD CUTTING IN SUPERSMALL HOLES
The paper reports the peculiarities of thread cut-ting in holes of super-small diameter (d ≤ 1.4), the im-pact of a diameter upon regularities of machining and chip formation. The reasons of low thread cutting reli-ability and the ways for its increase are revealed
Key words: thread cutting, super-small diameter, fine turning, chip section, cutting moment formation
M.Yu. Kulikov, A.Yu. Popov, D.V. Volkov.
ROTARY TURNING REALIZATION UNDER PRODUCTION CONDITIONS
The paper reports the description of the device for rotary turning with tool forced drive ensuring a quick equipment setup under production conditions at turning parts made of austenite steel 12H18N10T. Sig-nificant advantages of this kind of machining in com-parison with common turning and rotary cutting with self-rotating cutters are shown. The following methods of investigations are used: “rule-of-thumb” methods, experiment, observation methods.
Practical tests carried out have shown a possibil-ity of developed device use for rotary turning at rough-ing and semi-finishing long shafts and axles. Further-more, a stepped shaft semi-finishing by a chosen way is possible, but with the further additional finishing.
Radial forces at a small cutting depth and a cut-ting temperature at rotary turning are considerably lower than at turning with prismatic cutters. It allows not only increasing a processing speed, but decreases considerably a blank deformation.
According to results of tests carried out at fur-ther investigations it is supposed to be concentrated upon the solution of two basic problems:
1) the study of problems taken place at rotary turning and deduction of a dependence of ratios of a cutting speed and a frequency of cutting plate rotation at different feeds;
2) the study of cutter operation modes at the element chip transition into the continuous one.
Key words: metal cutting, cutter, rotary turning, rotary cutter
INVESTIGATION OF HEAT MODE AT GRINDING USING SOLID LUBRICANTS
The paper reports the investigation of a solid lubricants impact upon a temperature process at differ-ent high-speed steel grinding with cBN disks. Temper-ature measurements were carried out with the aid of an artificial thermocouple. Solid lubricant was applied upon a disk cutting surface with a ceramic bond in the course of processing with the aid of a special device. As a basis of the lubricant composition chosen there was used hexagonal boron nitride. The regularities of contact temperature changes during the machining in different modes (velocity of cBN disk, traverse feed and cross-feed) were revealed, and also an impact upon chemical structure temperature of high-speed steel was defined for that a machinability factor was used. As a result of experiments were obtained regularities of contact temperature changes in different cutting modes and were presented empirical dependences which allow setting reasonably working conditions. The efficiency of solid lubricant use is shown the application of which allows decreasing ther-mal process stress almost twice and the recommendations for its efficient application under conditions of production are given
Key words: solid lubricant, cBN disk, contact temperature, high-speed steel, machinability factor, cutting modes
Informatics, computer engineering and management
A.I. Andriyanov, A.A. Anisimov.
ACTIVE POWER FILTER OF SEQUENTIAL TYPE WITH
UPDATED SYSTEM OF CONTROL
The paper is devoted to the investigation of an active power filter (APF) of a sequential type updated from the viewpoint of the system of control. As an optimization is taken a refusal to use current sensors and a control system improvement in such a way that a power balance is support through the circuit of a direct current unit. There is also presented an update algorithm of the formation of inner circuit supporting voltage using an untypical approach to the computation of a phase and a fundamental frequency of input phase voltage. A computer model of the APF is created. A computer simulation proving a working capacity of the algorithm offered for the computation of frequency and a phase of the supporting voltage of input voltages is created. A nomograph allowing the choice of parameters for the regulator of a direct current circuit unit is obtained reasoning from the specified duration of a transient. A simulation confirming the correctness of a regulator parameter choice is carried out
Key words: active power voltage filter, system of control, sinusoid distortions, regulator
.A. Logvin, I.V. Tereshko, V.V. Redko-Bodmer, S.A. Sheptunov.
USE OF PHOTOELECTRIC METHOD FOR CONTROL OF GLOW DISCHARGE
VISIBLE RADIATION AT CREATION OF AUTOMATED TECHNOLOGICAL
ENVIRONMENT FOR MATERIAL MACHINING
The paper reports the investigation results of photoelectric method possibility for the intensity stabil-ity control of glow discharge visible radiation at prod-uct processing. It is defined, that the intensity of plas-ma visible radiation depends upon basic parameters of a product working process and submits to the control and stabilization. The developed method of control has shown its efficiency and working capacity in the whole range of process parameter changes and could be used in the system of control at the development of the automated technological environment for realization of new technologies based on glow discharge use
Key words: plasma, glow discharge, radiation intensity, automated technological environment, vacuum plants
S.A. Sheptunov, R.I. Kuliev, T.I. Kulive, R.S. Nakhushev, R.I. Zakirov, A.O. Shevkhuzhev.
BASIC DIRECTIONS IN DEVELOPMENT OF MAN-MACHINE
INTERFACES AND EXAMPLES OF THEIR USE
Man-machine interfaces are already widely used in various fields of human activities. The development of interfaces and technologies corresponding to them and also information technologies is supported by state target programs.
This paper reports the introduction into the sub-ject of natural-intuitive interaction with a computer, a review of modern man-machine interfaces existing now and examples of their use in this world. Basic concepts of a natural-intuitive interface the advantages of its application, hardware support are considered. The review of means and tools of man-machine interfaces is carried out
Key words: man-machine interface, virtual reality, magnetic nano-particles, electric field
Metallurgy and materials science
PERFECTION OF CAST IRON MODIFIER SELECTION PROCESS
The paper reports cast iron modification with the purpose of globular graphite formation in it. It is possible at the formation a barrier round a primary crystal. The barrier formation is possible at the definite characteristics of modifiers. Such characteristics are a small coefficient of addition distribution in a modified phase and an element solvability in an alloy liquid ba-sis –austenite. On the basis of these parameters there was formed a diagram where into a rectangle the most suitable modifiers fall for the production of globular graphite. There were also carried out additional re-searches of elements for the cast iron modification which have shown the strongest impact upon the globular graphite shape formation of element Eu. In the paper the interaction of the modifier introduced and the fixed carbon content is presented. Besides, in the paper the values of hardness according to Vickers method and the values of strength limits at the cast iron modification with some elements are shown. For the purpose of the reliability assurance of parts operation at different loads it is necessary that a quantitative connection should be established between a graphite form, dispersion degree and mechanical properties. The paper reports the analyzed parameter of “graphite inclusion form factor” combining in itself such factors as a graphite form, dispersion degree and mechanical properties. The dependence for the defi-nition of a graphite volume part in cast iron is presented. The paper reports the equations of regression which could be used for the assessment of structure factors impact upon a breaking point, impact elasticity and relative elongation after hardening and HF tempering
Key words: cast iron, modifier, selection process, graphite
V.I. Vorobiev, O.V.Izmerov, M.A. Maslov.
OBJECT MODEL OF LOCOMOTIVE TRACTION DRIVE
The problem of choice of object model technical solutions to the mechanical part of the traction drive of the locomotive. The pro-posed model in a hierarchy of sets of descrip-tions with varying degree of schematization and the library description of the model ob-jects in a hierarchical structure of functional interaction between the elements
Keywords: mathematical modeling, traction drive of the locomotive, design automation, the object model
D.M. Makarevich, S.D. Makarevich.
MOTOR ASYNCHRONOUS RAILWAY DRIVE
The work purpose consists in the development and creation of a new design of the motor drive for cir-cuit breakers of a contact system of electrified railway track sections, the analysis of the curvilinear rocker mechanism synthesis for this drive.
A possibility of the curve synthesis for creation of a link ensuring a specified law of motion at the known geometrical parameters of a unit and also specified power and kinematic parameters of input and output units is analyzed.
The investigation results allowed developing, designing, manufacturing and testing a motor drive for switching contact breakers of electrified railway sec-tions.
The results of this work allowed creating a mo-tor drive with a rocker mechanism consisting of two arched guides which has a possibility to increase con-siderably a rotational moment imparting to a working element at the moment of the breaker switching on or out.
Key words:drive, link, circuit breakers, asynchronous motor, reducer, crankshaft