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scientific edition of Bauman MSTU

SCIENCE & EDUCATION

Bauman Moscow State Technical University.   El № FS 77 - 48211.   ISSN 1994-0408

Constructional Material Processing in Machine Building

Manufacturing capabilities of cutting with early plastic deformation during the final abrasive processing
# 04, April 2013
DOI: 10.7463/0413.0541432
V.M. Yaroslavtsev
The results of the investigation of a combined method of the final processing which is called “surface plastic deformation - smooth finish” are presented in this article. It was experimentally determined that application of this technology allows one to combine the advantages of both mechanical hardening of a work-piece surface (improving operational properties) and abrasive machining (providing high accuracy and fine finish of a surface) methods. For example, the fatigue resistance σ-1 of samples made of 12H18N10Т and 37H12N8G8МFB steels after the proposed combined “surface plastic deformation - smooth finish” processing is increased by 28-42% in comparison with the resistance of samples processed by smooth finish only. Besides, grinding of previously deformed samples tends to be smoother than the traditional grinding at the equivalent modes. Geometrical errors of sample surfaces obtained with the use of both methods are approximately the same.
Setup for studying the process of cutting materials at low cutting speeds
# 03, March 2013
DOI: 10.7463/0313.0541420
V.M. Yaroslavtsev, A.Yu. Gusenko
In this article the authors describe the construction and operation of a technological laboratory setup for studying the process of chip formation during cutting at micro speeds; this setup was developed at Bauman MSTU. This setup was developed on the basis of a large Zeiss engineer microscope. The setup includes a special drive for moving a work piece relative to a hard-mounted tool; it also includes an automated photo micrographic attachment for recording separate stages of deformation and destruction of a material of the layer being cut, and a specially designed dynamometric device based on the elastic and electrical operating principle for determining the cutting force components. This set of devices allows to investigate and record separate stages of the chip formation process in more detail and to estimate their influence on formation conditions and quality of machined surfaces. 
Determining the deformity of cutting waste during cutting a material with heterogenious properties
# 01, January 2013
DOI: 10.7463/0113.0541311
N.A. Yaroslavceva
In this article the author presents analytical dependences for determination of geometrical parameters and orientation in the root of cutting waste of a rectangular dividing grid after two consecutive great inelastic deformations (surface plastic deformation and cutting). Images of deformed condition of a material, obtained during real processing by means of the micro-coordinate dividing grid method (square side of a grid cell is equal to 60 µ m), are also presented in the article. The author also compares estimated eformities and corresponding experimental data recorded in the area of chip formation for materials of different machinability groups. It was established that during cutting of materials with surface deformation, deformation values were redistributed across the thickness of cutting waste; relative smoothing of deformation degree across the section of a layer being cut also occurs.
Investigation of mechanical properties of multilayer carbon nanotubes
# 02, February 2013
DOI: 10.7463/0213.0533309
Yu.S. Belov, E.V. Vershinin, D.S. Govorov, B.M. Loginov, A.V. Ponomarev
Basing on the previously developed mathematical model with the use of combinational potential, the stress-strain state of single layer and multilayer carbon nanotubes was analyzed. Introduction of a dimensionless parameter defining the nanotube length to radius ratio allowed to unify the results obtained for single layer nanotubes. For single layer and multilayer nanotubes of different types dependences of strain on extra energy per one nanotube atom were calculated. Specific regularities of bifurcation processes development, depending on the number of nanotubes layers, their geometry characteristics and chirality are discussed.
Factors affecting the accuracy of upsetting at stamping on a hydraulic press
# 12, December 2012
DOI: 10.7463/1212.0500313
A.G. Vyatkin, A.A. Vyatkin
 The process of cold upsetting of cylindrical work pieces on a hydraulic press was investigated. It was shown that errors of height and diameter of initial work pieces affected the accuracy of forged piece’s height in different ways. The degree of deformation of basic work pieces and relative sizes of forgings significantly altered the degree of influence of those errors on accuracy of forging.
About electrodiffusion wear
# 12, December 2012
DOI: 10.7463/1212.0486388
V.G. Kovalev, S.V. Kovalev
In this article the authors consider the basic questions of electrodiffusion physics. At cold plastic deformation, heat warms up the workpiece and the tool which are being machined, which, with different contact potential difference of the workpiece material and of the tool, generates an electromotive force (thermo-voltage) which usually increases along with increasing strain and temperature of contacting materials. The experimental data presented in this paper show that during the process of cold deformation of metals there occur thermocurrents from cutting (a related processing) which promote intensive tool wear. With the exclusion of their influence, tool life is increased by several times.
Research of generation profile of cathode of arc evaporator with arched magnetic field
# 11, November 2012
DOI: 10.7463/1112.0482485
D.V. Duhopel'nikov, D.V. Kirillov, V.A. Ryazanov
Generation profile of the cathode of the arc evaporator was researched in various operating modes: at the change of the discharge current and induction of the arched magnetic field. Width of the generation profile was compared with the width of cathode-spot motion. Dependences of the width of the cathode-spot motion on the discharge current and induction of the arched magnetic field were obtained.
Development of technology and research of quality of sharpening of precision cutting tools made of ultra-hard materials
# 09, September 2012
DOI: 10.7463/0912.0482398
V.V. Lapshin, S.V. Grubyy
 The article describes the process of sharpening of precision cutting tools made of ultra-hard materials for ultra-precise cutter-grinding machines. These are the requirements to be met by the sharpened surface and by the means by which they are achieved. The authors present the results of their research of the quality of sharpened surfaces, and the results of tests of different cutters operations. 
Creation of highly specialized tools for processing coarse-pitch tooth gears
# 09, September 2012
DOI: 10.7463/0912.0476159
L.L. Artyuhin, N.A. Vetrova, O.S. Ott, M.A. Nadol'skii
The authors consider a modular disk instrument which operates by the rolling method and allows to perform the final machining of tooth gears, especially coarse-pitch ones, using manufacturing capabilities of modern numerical program control (NPC) equipment. The authors developed and studied the method of processing side faces of tooth gears coarse-pitch profile on NC machine tool by means of tooth generation with disk carbide tools, in the absence of a rigid kinematic connection between the rotating cutter and workpiece, applying speeds which are rational for carbide cutting. The results of testing the tool in the laboratory are given in the article. The authors carried out complex estimation of accuracy of the obtained wheel which was processed with special built-up tooling.
Estimate of springing spherical lining on squeezing with fluid during calibration
# 10, October 2012
DOI: 10.7463/1012.0469199
A.S. Sof'in, V.D. Baskakov, V.A. Tarasov
The authors propose a method of creating analytical relationships to estimate springing of parts after calibration with fluid or with flexible media. The authors obtained formulas for estimation of nominal and random components of springing for facing spherical shape based on results of numerical simulations. The authors show principles of the process and give recommendations on the choice of conditions for calibration.
Application of Raman spectroscopy in research of polymer composite materials
# 07, July 2012
DOI: 10.7463/0712.0431524
Yu.M. Mironov
In this article a promising outlook of Raman spectroscopy application in research of polymer composite materials is shown. The author also considers a possibility of Raman spectroscopy application in research of structure polymer material and estimation of adhesion between fiber and polymer matrix for determination of stress transfer from fiber to polymer through interphase layer.
Modeling of dependences of physical-mechanical properties on parameters of micro- and nanostructure polymer composite materials
# 06, June 2012
DOI: 10.7463/0612.0431339
S.A. Lur'e, Yu.M. Mironov, V.A. Nelyub, A.S. Borodulin, I.V. Chudnov, I.A. Buyanov, Yu.O. Solyaev
The authors propose a mathematical model of polymer composite armored with fillers of various sizes. It is shown that the obtained theoretical relations allow to predict physical-mechanical properties of certain material reliably and to determine an optimal variant of filling with micro- and nano-inclusions.
Investigation of microstructure of nano-modified polymer composite materials
# 07, July 2012
DOI: 10.7463/0712.0431361
I.A. Aleksandrov, I.A. Buyanov, I.V. Chudnov, A.S. Borodulin, Yu.M. Mironov, V.A. Nelyub, A.N. Muranov
In this article the authors present polymer composite materials based on polyester matrix modified with carbon nanotube; these materials were investigated and manufactured. The obtained results of microstructural investigation of samples indicate a promising outlook of using carbon nanotube as nano-modificator for increasing the strength characteristics of polymer composites.
Research of cutting properties of boron nitride cutters
# 06, June 2012
DOI: 10.7463/0612.0423622
S.V. Grubyy, V.V. Lapshin
The authors analyze properties of ultra-hard tool materials on the basis of boron nitride of various brands and manufacturers – both domestic and foreign. Recommendations on regime parameters of processing work pieces made of hardened steel were analyzed. Calculation dependences of tool life, cutting speed, forces and roughness of the processed surface are given. The authors present the results of their experimental research of cutting properties of various brands of tool materials on the basis of boron nitride when processing work pieces made of hardened steel. Directions for further investigations of tools made of modern materials on the basis of boron nitride were outlined.
Use of nuclear proton back-scattering spectrometry for the study of anodic cementation of low-carbon steels
# 05, May 2012
DOI: 10.7463/0512.0410498
P.N. Belkin, A.M. Borisov, V.G. Vostryakov, A.V. Kosogorov, B.L. Krit, N.V. Tkachenko
The authors investigates the coating surface of low-carbon steels after their carbon saturation at various parameters of anode electrolyte heating. Distribution of oxygen and carbon concentrations depending on the concentration of NH4Cl and temperature was defined by means of the nuclear proton back-scattering spectrometry method.
Thermophysical properties of permeable elements based on porous net materials
# 05, May 2012
DOI: 10.7463/0512.0400624
A.F. Tret'yakov
The author revealed the influence of thermalphysic properties of porous net materials (PNM) on the formation mechanism of the joint produced by the fusion welding. The designs of get-forming elements and plastic deformation in the PNM manufacture process have action upon anisotropy of efficient thermal conductivity. The method is presented to calculate the PNM efficient thermal conductivity and its anisotropy. Functional relationships are obtained to estimate technological process parameters providing the PNM production with prescribed thermalphysic properties. Experimental research of efficient thermal conductivity confirmed the adequacy of the obtained regularities; the research was performed both by the cylinder method and the plate method. The results of theoretical and experimental studies of thermalphysic properties are used for evaluation of energy input rate necessary for fusion welding of porous elements.
77-30569/361706 Numeric simulation of axial-symmetric machine parts calibration with technological liquid
# 04, April 2012
A.S. Sof'in, A.V. Strijkov, N.V. Ul'vis, O.V. Zarubina, R.V. Boyarskaya
The article considers the results of the finite element simulation of loading and unloading of thin-walled axial-symmetric machine parts during calibration with liquid in the ANSYS APDL framework. The results of the calculation of the elastic blowback were compared with the experimental data on calibration of half-spheres with a fixed flange.
77-30569/359525 Method of estimation of resistibility to cold crack’s formation in heat-treated alloy steel while temepering in the conditions of multilayer welding
# 04, April 2012
Yu.G. Romanov
The author proves practicability of the phenomenological approach to estimation of resistibility of researched steels to formation of cold cracks (CC) in the conditions of partial tempering of martensite. The author considers the main stages of developing the proposed method and presents an algorithm of estimation of a particular steel resistibility to XT. Particular characteristic of the developed method was given. The possibility of application of the method was shown by estimation of changing of resistibility to XT of steel 30XH3M2ФА in the conditions of multilayer welding.
77-30569/341732 Formation of tap failures
# 03, March 2012
A.E. Dreval', A.V. Litvinenko
The article presents the results of experimental studies of physical phenomena occurring during threading structural steel 45 with taps. It was experimentally confirmed that the greatest relative loads are on the cutting profiles located at the base of the cutting cone. This fact determines their more intense wear. The article includes the analysis of changes in the cutting profiles in the radial direction, changes in transition of the main and minor cutting edges and their corner radius. The authors developed a generalized dependence of tap wear rate in major-diameter.
77-30569/315087 Form error of thin-walled workpiece fixed with cams considering the size of contact area between mating parts.
# 02, February 2012
D.S. Blinov, V.F. Alyoshin
The case of thin-walled workpiece fixing with n cams was considered. Algorithm of calculation of main parameters when fixing the thin-walled workpiece. Proposed algorithm differs from known algorithms because it takes the size of contact area and diagram of contact pressure into account. Dimensionless graphics were plotted for the case when the workpiece is fixed with three cams. These graphics allowed to determine contact half-angle, form error of workpiece when it’s fixed with three cams and movement of median surface’s points of workpiece under the cam and strictly between cams. The example of the calculation was included in this article.
 
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