Vol 7, No 2-2 (2013)
- Year: 2013
- Articles: 82
- URL: https://medbiosci.ru/2074-0530/issue/view/3757
Articles
Piston Rings
Abstract
The article describes the development of technology for the manufacture of steel piston rings by cold plastic deformation during drawing. It defines conditions of thermal treatment at recrystallisation tempering, thermofixation and thermostabilization. The paper also considers the calculation of degree of plastic deformation at drawing and the foundation of a choice of tool steels. It reflects research in the field of thermochemical treatment methods of drawing rolls and piston rings.
Izvestiya MGTU MAMI. 2013;7(2-2):8-13
8-13
Research of the influence of the wall thickness variation of blanks punched by drawing with parts thinning on the uneven distribution of mechanical properties in the cross-sections
Abstract
This article describes the impact of the wall thickness variation on the formation of the mechanical properties in the cross sections of parts punched by drawing with thinning details. It offers a model of wall thickness variation forming in the multi-operational drawing with thinning processes that considers the influence of the geometry of the working tool and the accumulated strain.
Izvestiya MGTU MAMI. 2013;7(2-2):13-17
13-17
17-19
Resource-saving preparation of the structure and mechanical properties of steel 40X for cold die forging of hardware
Abstract
The article contains the technology of the preparation of the level surfacehardening, mechanical characteristics and structure of rolled used for cold die forging, eliminating the costly operations annealing furnaces and mechanical turning of surface defects.
Izvestiya MGTU MAMI. 2013;7(2-2):19-23
19-23
Development and research of technological possibilities of manufacturing two-layer spherical plugs of ball valves from billets by crimp method
Abstract
The article considers the relevance of the use of two-layer structures of spherical plugs of ball valves as well as the advantages of technology for their manufacture process-based on stamping over traditional methods. The experimental study showed the technological capability of manufacturing processes by metal forming billets and it also gives recommendations on the correlation of the outer and inner layers of the spherical shell plug ball valve.
Izvestiya MGTU MAMI. 2013;7(2-2):23-27
23-27
The technology of precision tubular products using compression on the profile mandrel rolling-drawing non-driven rollers
Abstract
Manufacture of long hollow parts specified internal profile of the hard-deformable alloys based on process improvement of cold deformation of a tubular workpiece requires the development of science-based modes of technology to assure the quality of products, reduction of the complexity of manufacturing, steel intensity etc. Stress-strain state and energy-power parameters of the rolling-drawing process non-driven roller tubular billet on the profile mandrel is define by computer analysis that have been made. The shape and dimensions of mandrel corresponded to the inner surface of the rifle barrel with the polygon profile type. As a result, it has been developed and manufactured the corresponding technological device and has been manufactured the product by above method.
Izvestiya MGTU MAMI. 2013;7(2-2):28-32
28-32
Cold extrusion with differentiated counter-pressure of die cavities
Abstract
The article describes the engineering method to obtain the correlation for the determination of stresses on the contact surfaces of the workpiece and the tool, the efforts of the extrusion of cavities by spherical die. It shows numerical simulations made on computer simulation by the finite element method on examples of extrusion by spherical die of billets made of R6M5 (Р6М5) steel under the action of counter-pressure on the free surface of the workpiece. The paper contains the definition of the maximum counter-pressure through simulation that provides extrusion without destruction and the efforts of the processes, the distribution of stresses in the deforming tool and the stress-strain state, the degree of resource use of metal plasticity, as well as the final product dimensions. The article contains a description of the experiment on the extrusion billets of steel R6M5 (Р6М5) spherical die.
Izvestiya MGTU MAMI. 2013;7(2-2):32-37
32-37
Technology of upsetting process for parts with rectangular head and spherical radius
Abstract
The article describes the research of upsetting process for parts with a rectangular head. It describes the modeling of a combined upsetting process for bolts with rectangular head. The FEM system Q-Form is used for 3D modeling. The paper contains the original data and simulation results.
Izvestiya MGTU MAMI. 2013;7(2-2):37-41
37-41
The process of obtaining a roll-formed sections with a predetermined longitudinal curvature through control the characteristics of plastic hinge in the deformation zone
Abstract
The article describes the processes of formation of roll-formed sections with a predetermined longitudinal curvature. It contains a research of the theoretical foundations of a plastic hingeformation in the deformation zone and the management of its properties.
Izvestiya MGTU MAMI. 2013;7(2-2):41-45
41-45
Development of technological schemes of slip-rings made of beryllium bronze with methods of sheet stamping
Abstract
The article consists of research results that shows the way how to produce slip-rings made of beryllium bronze with the use of sheet stamping and heat treatment. It shows the properties of the elongated semi-finished parts and their structure at various stages of the proposed scheme.
Izvestiya MGTU MAMI. 2013;7(2-2):45-48
45-48
System management of the design process separating stamps for cold stamping
Abstract
The paper considers the system control process over design process of successive separating stamps for cold sheet stamping. It shows structural and logical formulas that reflect the possible design options of these stamps with the proposed character of parts and components. This article also describes the correspondences between the elements of the subsets of a separating stamp to describe the parametric object structure, using methods of discrete mathematics.
Izvestiya MGTU MAMI. 2013;7(2-2):48-52
48-52
The quality of products improving for flanging of circular holes in sheet metal blanks and profiles
Abstract
This article describes a method flanging round holes in sheet blanks and profiles which consists of the steps of forming holes cold extrusion to produce a profiled workpiece, punching coffers and flanging.The product after the flanging has a constant wall thickness and a smooth cylindrical surface.The article contains an engineering method to determine the dependence for determining forces of flanging profiled billet spherical punch and the size of the source profile. It shows flanging holes processing profiled billet and flanging with thinning which was carried out by finite element method and it also shows the comparison of results of two methods.
Izvestiya MGTU MAMI. 2013;7(2-2):52-58
52-58
Deformation determination of the layers in the axisymmetric forming a two-layer billet
Abstract
The paper describes the experimental study of an axisymmetric two-layer workpiece forming with viscoelastic bonding layer. It shows the distribution of thinning of layers in radial the direction is received. It is revealed that the distribution pattern of thinning of the outer and inner layers of the cross section of the billet significantly differ.
Izvestiya MGTU MAMI. 2013;7(2-2):58-62
58-62
62-64
64-67
67-71
The expansion of technological capabilities and advantages of convex inserts pre-forming in a hot die forging process of forged plates
Abstract
This paper reflects the comparative studies based on modeling of technological forging processes of part type "movable plate" in the industrial technology base used by CJSC "Azovelectrostal" (Mariupol, Ukraine) and the new technology proposed by the results of preliminary research and developed recommendations.
Izvestiya MGTU MAMI. 2013;7(2-2):71-76
71-76
Design a tool for hot rolled workpiece
Abstract
The article considers the methodology of designing groove of sectors-die-rolling workpiece in the oval and round gauges. The result of analyzing the experimental data obtained by the regression equation allows to consider the rolls springing and the irregularity in widening of workpiece in die groove design
Izvestiya MGTU MAMI. 2013;7(2-2):76-79
76-79
80-84
Thermal barrier coatings for precision stamping heat-resistant steels
Abstract
The article contains the study of the properties of thermal barrier coatings applied to the precision forging of compressor blades from high-temperature steels EP-866 (ЭП-866).Under production conditions was studied the influence of changes in the composition of thermal barrier coatings. The article presents the stamping results of compressor blades using thermal barrier coatings and die lubricants on colloidal-graphite-based.
Izvestiya MGTU MAMI. 2013;7(2-2):85-88
85-88
89-92
Theoretical and experimental research of forging operation in split dies
Abstract
This article describes a new mathematical model of stamping products in split die on the universal hydro-pressure equipment from high-strength materials. It describes the calculations of materials pressure in split die stamping of cross billet that is made from aluminium Amg6 (АМг6) and titanium ВТ6С alloys. The work contains the comparison of the experimental research results with theoretical data.
Izvestiya MGTU MAMI. 2013;7(2-2):92-96
92-96
96-100
Effect of thermomechanical processing schedule on microstructure and mechanical properties of ultra high strength steel forgings
Abstract
The paper presents results of determination and industrial verification of cooling cycles in thermomechanical processing (TMP) of steel AISI 4130, designed to produce good combination of strength and ductility directly after forging and quenching. The results indicate possibility of replacement costly high alloy steels with common grades offering higher strength in combination with good plasticity after cost-effective TMP cycles utilizing blast-air cooling from controlled forge end temperature.
Izvestiya MGTU MAMI. 2013;7(2-2):101-105
101-105
105-110
The mathematical model for calculating the thickness distribution of the metal in stamping in multisection dies with rotating discs
Abstract
In this article the authors have proposed a mathematical model to calculate the thickness distribution of the product when drawing of axisymmetric parts in the stamp with multisection rotating discs for correction of technological parameters of the process. The model considers the mechanism of stress-deformed state, geometrical relations and approximation algorithm. Euler's method was used to solve the problem allowing determine the parameters of the next step of integration, basing in the previous results. This algorithm allows to make quick adjustments with the appearance of additional conditions and can be recommended for the calculation of the technological parameters of the technological process.
Izvestiya MGTU MAMI. 2013;7(2-2):110-115
110-115
Analysis of stress and strain state in the elementary volume at the example of the upseting process
Abstract
The paper contains general positions and the results of the analysis of the stress state in the elementary volume, as well as the impact of such technological parameters as a factor of frictional coefficient and value of the relative deformation on the results of the upset process.
Izvestiya MGTU MAMI. 2013;7(2-2):115-120
115-120
Modeling the evolution of the deformation zone under various extrusion schemes
Abstract
Using the simulation results it was shown an optimal correlation of the size and porosity of powder compacts and also the amount of counterpressure recommended for the production of equal channel angular extrusion of workpieces with high-density of deformation zone that is large enough for subsequent direct extrusion powder of parts with high mechanical properties.The article defines the maximum depth of the cavity in direct extrusion through the research of plasticity resource. This paper describes the developed technology of manufacturing high-density parts of the "glass" type with the consistent application of the equalchannel angular and direct extrusion.
Izvestiya MGTU MAMI. 2013;7(2-2):120-124
120-124
Criterion of damage for the design of metal forming processes
Abstract
In the design of metal forming processes it is widely used to obtain a linear model of damage accumulation and scalar failure criterion. The process of plastic deformation can be described by the kinetic equation of nonlinear dynamics for systems with a strong positive correlation. This paper considers the failure criterion and condition of deformation without destroying in multi-step process of plastic deformation. Check of applicability of criterion showed that it can be used for solving practical problems of processing of metal forming processes.
Izvestiya MGTU MAMI. 2013;7(2-2):124-128
124-128
Determination of the stress-strain state of plastically deformed object with regard to the processes semi-hot die forging
Abstract
The article describes alternative methods of solving the boundary value problem of determining the stress-strain state of the visco-plasticdeformable body in relation to the processes of semi-hot die forging processes using the theory of heredity, which establishes the relationship between stress and strain considering the speed and the history of the loading process.
Izvestiya MGTU MAMI. 2013;7(2-2):128-133
128-133
Analysis of calculation methods of springback of sheet materials
Abstract
The article contains a review of the scientific literature on the springback issue. This review describes the work on the analysis and theoretical argumentation for springback. It shows the classical methods of springback calculation that are used in its forecasting. This paper consist of modern research about the springback issue, mathematical analysis, experimental research (springback of the laminated materials).
Izvestiya MGTU MAMI. 2013;7(2-2):133-139
133-139
Theoretical and technological aspects of tube billets pinching
Abstract
This article considers the stress-strain state of the billets under pinching of tapered die on the basis of the mathematical model. Basic relations obtained in the theoretical analysis can assess stress in the deformation zone and to determine the strain field and calculate the length of the original tube billets.
Izvestiya MGTU MAMI. 2013;7(2-2):139-145
139-145
Transverse stability of different-walled billets under pinching in stepped tapered dies
Abstract
The article considers an influence of thickness variation on the stability of tube billets at pinching in stepped tapered dies. It describes the corresponding mathematical model that allows to predict the loss of billets stability at pinching in the design stage of the technological process.
Izvestiya MGTU MAMI. 2013;7(2-2):145-149
145-149
Phenomenological approach to the determination of the stress state of the indicator chart for plasticity
Abstract
We propose a parameter state of stress as the sum of the principal stresses relative to the odds of their influence. Influence coefficients are mechanically-mi material properties. Plasticity chart with this indicator is proposed to approximate the exponential function. Checking for different materials showed sufficient proximity of the experimental points to a diagram of plasticity. Recommendations are given for determining the coefficients of arbitrary types of tests. The minimum number of tests - 4.
Izvestiya MGTU MAMI. 2013;7(2-2):149-153
149-153
Assessment of the accuracy results of the numerical simulation in problems of forming shells of sheet metal
Abstract
This article describes the results of the application of an axisymmetric rigid-plastic finite element membrane model to the research of the process of forming by a spherical die and process of hydraulic bulging into a flat bottomed die. The results of numerical simulations are compared with experimental data.
Izvestiya MGTU MAMI. 2013;7(2-2):154-158
154-158
158-163
Theoretical analysis of the combined radial-reverse extrusion parts with flange
Abstract
This article describes the mathematical model of the process combined radial-reverse part extrusion type of glass with a flange for identifying energy-power parameters of the process and explore the gradual and the final forming of the billet. It shows a comparative analysis of the phase-forming patterns based on the proposed computational scheme, finite element modeling and experimental data.
Izvestiya MGTU MAMI. 2013;7(2-2):163-171
163-171
172-175
175-178
Simulation of mechanical tests aimed to investigate the flow stress during the abrupt change of the strain rate
Abstract
This article describes a modeling procedure of material’s mechanical test during the abrupt change of the strain rate. Simulation results were compared with the data obtained experimentally. The numerical simulation was performed in the FE-program QFORM. The paper describes the selection of areas for further research related to the definition of mathematical models of deformation resistance, and it also contains the software requirements for the simulation of mechanical tests.
Izvestiya MGTU MAMI. 2013;7(2-2):178-183
178-183
Horizontal counterblow hammer with hydraulic mass connection
Abstract
This article describes the design of the horizontal counterblow hammer and principle of its operation. The purpose of its development is to improve the timing accuracy of oncoming traffic impact of the masses. The result is the development of new design that combines hydraulic synchronization mechanism and a horizontal layout of the hammer
Izvestiya MGTU MAMI. 2013;7(2-2):183-187
183-187
Research of the accumulation of damage in the parts of the press-forging equipment and tools by magnetic methods
Abstract
The article considers abilities of magnetic methods of non-destructive testing (in particular, measurement of coercive field) for determination of damaging and remaining life of dies material and equipment. This article describes the experimental determination of principles for the instrument used for hot (bulk) and cold (sheet and volumetric) forging.
Izvestiya MGTU MAMI. 2013;7(2-2):187-191
187-191
Experimental research of impact at upsetting on hammers in hot deformation
Abstract
The paper considers the results of experimental and theoretical research of the impact at upsetting blanks on hammers in hot deformation, showing the possibility of increasing the contact time of the hammer head with a workpiece, increasing the degree of deformation of the workpiece, reducing the strength of deformation in upsetting and increase efficiency in the use of blow of hammer head with a filler and confirming the earlier data on upsetting lead blanks.
Izvestiya MGTU MAMI. 2013;7(2-2):191-194
191-194
194-198
Springing of a multilayered material
Abstract
The paper describes the research of springing of a multilayered material. It shows the comparison of springing of a single-layer and multilayered sample. The article considers the change character of springing that depends on a bend angle and internal radius.
Izvestiya MGTU MAMI. 2013;7(2-2):198-202
198-202
Effect of the number of tag billets on the final part temperature
Abstract
The article describes the technology of deep cold die forging of parts which are made from low-alloy steel 20 and also the methodology of the experiment, revealed the effect of the number of stamped billets on the final temperature of the part
Izvestiya MGTU MAMI. 2013;7(2-2):202-205
202-205
Experimental research on the plastic upsetting between fixed walls of thin strips in the form of a rectangle and sector
Abstract
This paper describes experiments and analysis on the upsetting between approaching rigid plates of a thin plastic sample, limited fixed walls and originally shaped rectangle or sector. Fixed wall located along the long rectangle sides and along the radial sector boundaries. It describes the definition of experimental laws, which allows to choose the corresponding mathematical model.
Izvestiya MGTU MAMI. 2013;7(2-2):206-212
206-212
Calculation based on capacity of the crank hot-stamping presses for technological processes of thermomechanical treatment
Abstract
This article describes the calculation of the force stamping elongated forging at different temperatures in the open die by the M.V.Storozhev’s formula and compares the effort with stamping identical forgings as a result of the finite-element modeling. Options regarding corrections formulas are offered.
Izvestiya MGTU MAMI. 2013;7(2-2):212-216
212-216
Development of CAD subsystem manufacturing processes of jewelry
Abstract
The article contains elaborate algorithms and techniques of the design process sheet, flat-and-edge rolling and drawing of long semi-finished products for the production of jewelry made of precious metals and their alloys. This paper describes the developed software, which allows one to calculate deformation modes and energy-power parameters of the designed processes with the visualization of the data in tabular and graphical form.It also describes the process of adaptation of the developed CAD systems for production conditions jewelry chains of gold 585 at JSC "The Gulidov Krasnoyarsk Non-Ferrous Metals Plant".
Izvestiya MGTU MAMI. 2013;7(2-2):216-220
216-220
220-224
Modeling combined extrusion process to assess the limit of forming blanks from different materials
Abstract
This article considers a method of modeling combined extrusion process based on the hypothesis of force and kinematic similarity of deformation parameters. It also shows the expediency calculation of plasticity resource in the combined extrusion through failure criterion that takes into account the influence of the third invariant of the stress tensor on the plasticity of blanks deformed under three dimensional stress state.
Izvestiya MGTU MAMI. 2013;7(2-2):224-229
224-229
Application of the RP-technology for manufacturing of compact mountings in a small-series casting production
Abstract
Nowadays an actual problem in a foundry is the problem of resistance of foundry equipment. RP-modern technology can be used instead of technologies that are used now. Technology layering of ABS plastic is used to build a solid model mountings. The choice of this plastic as a material for foundry mountings showed a significant excess of its operating life of the foundry mountings which are made of wood.
Izvestiya MGTU MAMI. 2013;7(2-2):229-232
229-232
Design of prototype devices for producing metal microspheres and shells
Abstract
Rapid prototyping technology implemented quite actively for all types and types of production. Its application reduces the influence of human factor on quality of a product but it also require the operator that knows this field and have some skills of handling machine. These technologies are also used to create models and visual functional prototypes, which can recreate the developed process and test the individual steps to prove its efficiency. The laboratory equipment that was made in Freiberg University of Mining and Technology allows to produce metal microspheres and shell (0,5 – 3 mm). Modernization of this equipment was proposed by creating a prototype of a mechatronic system that would show the requirements to the device and its capabilities. Creation of a device prototype is a transitional point from a laboratory layout to production equipment that works with high performance and repeatability. The device can operate under vacuum and inert gas that allows to work not only with model materials such as tin, zinc, alloy rose eutectic alloys based on bismuth and tin but also with structural materials, such as aluminum, magnesium and their alloys. Individual parts of the functional prototype was created by rapid prototyping technology (MJM, FDM and milling) of the polymers.
Izvestiya MGTU MAMI. 2013;7(2-2):233-237
233-237
237-242
Strong interaction between the workpiece with abrasive wheels of double side grinding
Abstract
This article describes how two-sided grinding in mobile centers. The description of the force interaction of abrasive wheels with the workpiece. The possibility of reducing the elastic strain in bilateral grinding through setting up the machine.
Izvestiya MGTU MAMI. 2013;7(2-2):242-244
242-244
The calculation of volumetric accuracy
Abstract
It is hard to imagine the modern mechanical engineering without information technologies, machines are strong representatives of symbiosis of mechanics and electronics. Despite of the abundance of software products for calculations decisions often do not coincide with real challenges. New mathematics to determine the effect of vibration on the cutting process do not allows to solve all problems.
Izvestiya MGTU MAMI. 2013;7(2-2):245-248
245-248
Modern technologies tendencies in development of flow-skiving
Abstract
The article considers the kinematics of the flow-skiving, used cutting tools and cutting parameters. It shows the construction of the cutting tool: an integrated and modular with plug of carbide bar blade. The paper includes a design features for flow-skiving machine.
Izvestiya MGTU MAMI. 2013;7(2-2):248-250
248-250
Electrochemical finishing of airfoil blade wheels
Abstract
The article describes the change in the basic manufacture technology of the blades closed blade wheels through the use of finishing operations to remove the defective layer and to reduce the surfaces roughness of the blades after electroerosive firmware operation. The efficiency of the new operation instead of the original is based on a manual finishing of blade profile was confirmed by experimental studies. The article describes the experiments on the selection of the optimum parameters of the processing and selection of the optimal electrolyte. It also shows the effect of various parameters of the processing mode on the surface microgeometry formation during processing.
Izvestiya MGTU MAMI. 2013;7(2-2):251-257
251-257
257-262
262-267
Obtaining of optimum parameters and modes for ultrasonic diamond milling of glass-ceramic
Abstract
The article contains analysis of modern materials and prospects of its application. It considers two variants of ultrasonic milling of various tools. This article describes the effect of volumetric measuring, tool diameter on the roughness and the spherical radius in ultrasonic cutting of glass-ceramic. It contains the diagram of tool degradation depending on punched holes. The work contains selection of the most suitable parameters of the regime to achieve the accuracy and quality of processing.
Izvestiya MGTU MAMI. 2013;7(2-2):267-273
267-273
Simulation of control systems by engineering manufacture
Abstract
The article considers the system design of the integrated industrial control system of engineering manufacture. It shows that the establishment of Information Industrial control system is connected with the need to decompose the system control on a number of relatively independent subsystems of less complexity and with the requirement of ensuring the coordinated functioning.
Izvestiya MGTU MAMI. 2013;7(2-2):273-275
273-275
Cutting quality and accuracy parameters of billet at the cutting process in the dies by rotary tool
Abstract
Article considers the most common types of cutting of roll-formed profiles, cutting dies and cutting metal using slitting saw. It describes executed experience and the influence of cuts type on the quality. The paper shows the advantages and disadvantages of cutting methods and also gives general recommendations.
Izvestiya MGTU MAMI. 2013;7(2-2):276-278
276-278
Development and application of high technologies in aircraft production
Abstract
This article describes the prospects of the use of physical and chemical and vacuum technologies in the manufacture of rocket products and space technology. It is shown that these methods provide technical requirements for the processing of products that made from modern and advanced heat-resistant and corrosion-resistant materials. The paper contains examples and justification of the effective use of such a technology for solving problems of rocket and space engineering.
Izvestiya MGTU MAMI. 2013;7(2-2):278-283
278-283
Influence of processing factors on the structure and properties of carbon steel powder obtained by sintering and hardening of electropulse nanoparticles
Abstract
In the article the study of the effect of temperature electropulse sintering of powder on the properties of steel. The optimal conditions for obtaining medium-carbon steels, cold brittleness threshold is defined, which allows to judge about the possibility of powder steel for use with impact loads at low temperatures.
Izvestiya MGTU MAMI. 2013;7(2-2):283-290
283-290
Modernization of microinterferometer MII-4
Abstract
The article offers upgrading of microinterferometer MII-4 with the aim of bringing its capacity to modern analogues based on the analysis of advantages and disadvantages. The upgrade of the device will allow to receive digital images of the surface and keep them for further processing on a computer with the calculation of the fractal dimension.
Izvestiya MGTU MAMI. 2013;7(2-2):290-293
290-293
Influence of phase composition on the electro-thermal-physical properties of powder tungsten alloys for high-load electric contacts
Abstract
The article contains the results of studies of the electrical resistivity (ρ), thermal conductivity (λ), the Lorentz number (L) and electron work function (φ) of tungsten alloyed with, YB 6, (ВИб15) La 2O 3,(ВЛ15) Y 2O 3,(ВЛ5,ВИ15) Y 2O 3+ НfO 2 (Vigm) in a wide temperature range.
Izvestiya MGTU MAMI. 2013;7(2-2):293-295
293-295
The application of geometric programming for solving various technical and economic problems
Abstract
This article describes the solution of two technical and economic problems by methods of geometric programming. It is shown that due to their relative simplicity and clarity this method is best for the solution of such specific tasks as the project evaluation and the definition of expediency of obtaining investment on capital costs.
Izvestiya MGTU MAMI. 2013;7(2-2):296-299
296-299
The choice of a technique definition of platinoids at the disposal of automotive catalysts
Abstract
The article describes the analysis of existing physical and chemical methods for the quantitative determination of chemical elements. There is shown the use of analytical methods to control the concentration of platinum group metals in the products of utilization of automobile catalysts. The atomic spectral analysis and x-ray fluorescence analysis should be used to determine the content of platinum group metals in various stages of enrichment of scrap used automobile catalysts.
Izvestiya MGTU MAMI. 2013;7(2-2):299-304
299-304
The Hypothesis about the calculation of cutting forces accuracy. Cutting parameters. Designing of mathematical model
Abstract
The article shows the evaluation of the capabilities of the a priori definition of calculation accuracy of the cutting force in case of significant growth accounted number of cutting parameters. It contains a designed hypothetical mathematical model of a preliminary assessment of the calculation of cutting forces accuracy in machining structural steels. The paper describes the proposal as a hypothetical model a hyperbolic dependence of cutting force errors on the number of parameters that define the cutting process. It gives recommendations according to the accuracy of the cutting forces, depending on different process parameters and also - for the model developed with the help of a priori estimates of the errors in the calculation of the cutting forces in submodules САD/САМ/САЕ/РDМ systems. Experts in the field of metalworking and developers calculation modules of САD/САМ/САЕ/РDМ systems might be interested in this work.
Izvestiya MGTU MAMI. 2013;7(2-2):304-312
304-312
The Hypothesis about the calculation of cutting forces accuracy. Designing of mathematical model
Abstract
The article shows the evaluation of the capabilities of the a priori definition of calculation accuracy of the cutting force in case of significant growth accounted number of cutting parameters. It contains a designed hypothetical mathematical model of a preliminary assessment of the calculation of cutting forces accuracy in machining structural steels. The paper describes the proposal as a hypothetical model a hyperbolic dependence of cutting force errors on the number of parameters that define the cutting process. It gives recommendations according to the accuracy of the cutting forces, depending on different process parameters and also - for the model developed with the help of a priori estimates of the errors in the calculation of the cutting forces in submodules САD/САМ/САЕ/РDМ systems. Experts in the field of metalworking and developers calculation modules of САD/САМ/САЕ/РDМ systems might be interested in this work.
Izvestiya MGTU MAMI. 2013;7(2-2):312-320
312-320
Cutting coefficient in turning
Abstract
The article considers an overview of formulas for the simplified determining the cutting forces during turning. It describes the recommendations for their use, as well - to evaluate the accuracy of the cutting forces, including the development of sub-modules for calculating cutting in САD/САМ/САЕ/РDМ - systems. The work can be interesting for experts in the field of metalworking, as well as for developers of the modules calculation of САD/САМ/САЕ/РDМ - systems and for students of the technical high schools.
Izvestiya MGTU MAMI. 2013;7(2-2):320-331
320-331
Designing compensators of thermal stress for modern aviation turboshaft engine by powder metallurgy methods
Abstract
The article shows that for a real implementation in aircraft turoshaft engine of structural ceramic materials it is necessary to use an intermediate element - compensator thermal stress (metal-Compensator-ceramics) in conjunction metal-ceramic. The paper provides reasons of one way to create compensators - by powder metallurgy. It contains a list of the work needed to create compensators.
Izvestiya MGTU MAMI. 2013;7(2-2):331-336
331-336
336-343
Correlation characteristics of the mechanical metal properties
Abstract
This paper is one of the attempts to approach the problem of fatigue failure, based on a systematic approach, which lies at the intersection of solid mechanics and physics of strength and plasticity. The paper describes methods for determining the fatigue life of the product, focused on the practical use during the design calculations and debugging studies based on existing theories of strength.
Izvestiya MGTU MAMI. 2013;7(2-2):343-348
343-348
Quality management of technical products at the stage of technical projec
Abstract
The methods of quality control products at the stage of technical project. At the stage of the technical design of primary importance in improving the quality indicators are standardization and unification. As a result, the preliminary assessment of the likely quality of the products and make appropriate adjustments to the documentation, significantly reduced labor intensity and cost of obtaining the quality of products during their production.
Izvestiya MGTU MAMI. 2013;7(2-2):348-353
348-353
Finding the base for the calculation of quality products at the design stage of working documents
Abstract
The definition of basic products in development of working documentation is based on geometric representations of quality parts and assemblies. Optimization of technical products is their gradual improvement, where the objective function is to achieve perfect quality (base) articles. The base product is presented as a basic simplex, which fully describes the properties of the base product. In the presence of a basic product is possible at the margin in terms of quality to define engineering - technical measures necessary to improve the quality of parts and the product as a whole.
Izvestiya MGTU MAMI. 2013;7(2-2):354-356
354-356
Functional scheme of the automated laser vibration measuring systems with two optical channels converted to monitor and control the parameters of vibration
Abstract
Mathematical modeling involves the search for optimal solutions. Control of the parameters of objects vibration and structures can extend their service life. The analysis of parameters influence such as channel power ratio m, the angle of non-parallelism β, and the error angle of optical access α to the stabilization coefficient K.
Izvestiya MGTU MAMI. 2013;7(2-2):360-366
360-366
366-370
New principles of technological support, development and production of complex rocket-technical systems (for example, development of MTX "Energy-Buran")
Abstract
The article describes the experience of the application of new technological solutions in the implementation of the program of reusable space transport system "Energia-Buran". The examples of implemented technologies and technological equipment.
Izvestiya MGTU MAMI. 2013;7(2-2):370-373
370-373
Quality management of technical products in the development stage of working documents
Abstract
The methods of quality control of products under development documentation. At this stage, to identify weaknesses in the design of products used methods of quality control and optimization. The evaluation of the perceived quality of products and subsequent inclusion in the documentation necessary changes greatly reduced the complexity and cost of obtaining quality products at later stages of production.
Izvestiya MGTU MAMI. 2013;7(2-2):373-379
373-379
Mathematical model of electric discharge machining and processing management tasks
Abstract
Mathematical model of electric discharge machining, accumulating the experienced data throughout the process and allows you to synthesize control methods of the theory of automatic control. The problem of the sustainability of the process of handling the stress.
Izvestiya MGTU MAMI. 2013;7(2-2):379-385
379-385