Metalloobrabotka № 1 (103)/2018

Naumov A. G. Repin D. S., Latyshev V. N., Radnyuk V. S. Influence of activated polymer-containing COTS on characteristics of processes of leaving cutting of metals

In the article presents the results of experiments on turning a titanium alloy VT6 with carbide-tipped cutters of the VK-6OM grade with the use of corona-activated lubricating-cooling technologies with oxygen-containing polymer additives. Mathematical dependences of the period of tool life on the cutting and feeding speed are obtained.

Keywords: turning, lubricating-cooling technologies, corona discharge, oxygen-containing polymer additives.

Danilin G. A., Silaev M. U., Zaterukha E. V., Remshev E. U. Forecasting of characteristics of the mechani- cal properties of parts manufactured by cold punching

The article presents the results of a study of regimes of hardening low-carbon steels, the influence on the for- mation of their microstructure and mechanical proper- ties of various schemes of thermomechanical processing. Experimental data are presented showing that treatment application, which is a combination carried out in a se- quence of operations of plastic deformation, hardening and low vacations, provides increased strength more than

2 times compared to initial value with a sufficient level of plasticity.

Keywords: thermomechanical treatment, heat treat- ment, microstructure, mechanical properties

Gurskiy A. V. Restructuring sintered aluminum bronze during uniaxial compression at different temperatures de- formation

The behavior of sintered powder materials of the Cu- Al system under conditions of uniaxial compression at various temperatures was studied. The analysis of poros- ity and material structure changes depending on the com- position of the powder alloy and the loading conditions is given, the microhardness and limiting values of the strength and deformation of the sintered bronze are given.

Keywords: hot pressing, intensive plastic deformation, aluminum bronze, sintered alloys.

Haldeev V. N. Technique of definition of electric pa- rameters of the electroerosive processing mode

Optimum parameters of a mode of any processing technology including electroerosion processing, provide the highest efficiency of processing. The electric spark is the working tool of the electroerosion processing; there- fore, the energy and electric pulse duration are the main parameters of this kind of the technology. A method of the analytical definition of the energy and pulse dura- tion is proposed. For some metals, these parameters are computed and studied experimentally.

Keywords: electric erosion machining, process condi- tions, electropulse, pulse energy, pulse duration.

Maksarov V. V., Efimov A. E., Osminco D. A. Dynamic processes modeling of mechanical process in the ni labview for the improvement of manufacturing technology of parts of mining machines

In the presented article the questions connected with providing roughness of a surface layer of a detail «stock» in a technological process, due to management and forecasting at stages of mechanical processing by dynamic stability of a technological system by means of mathematical modeling taking into account the transient process are considered. The role of the transient process is performed by the method of preliminary local thermal action on the surface layer of the preform in the proposed area of the allowable allowance, which, due to the switch, introduces into the mathematical model a modernized structure different from the base metal by mechanical properties. To analyze the effect of the previously altered structure in the material being processed, the dynamic properties of the technological system adopt a two-circuit mathematical model describing the lag in the change in cutting forces. According to the results of mathematical modeling in the NILabVIEW 2013 software environment, it is estab lished that at the stage of mechanical processing there is a steady suppression of the arising oscillations during the passage of the zone with the modernized structure. The positive effect of suppression of oscillations is con- firmed by experimental studies. The suppression of the self-oscillating process in turn ensures the given parameters of the surface roughness and makes it possible to reduce the grinding operation in the current technological process, increasing the productivity and expanding the regime parameters of the machining.

Keywords: technological process, mathematical modeling, technological system, parameters roughness, self-oscillating process, local thermal influence.

Mokritsky B. Ya., Vereshchagin V. Yu., Vereshchagi- na A. S. Modeling as a means of optimizing the geometry of metal-cutting tools

The possibilities of simulation of cutting process using ANSYS software environments (standard module Workbench Explicit Dynamics), Solid Works (Simulation module), SOLID164 in the study of stress fields, temperatures and deformations of elements of system of cutting during the machining of work pieces made of aluminum alloy, structural steel, titanium alloys. The use of simulation allowed to design the topography of the front surface of the cutting tool used for regenerative turning of the wheels of railway carriages. This ensured efficient stoichiometry with the exception of education trombopenia continuous chip without compromising performance and quality.

Keyword: modeling, turning, railway wheels, chip breaking.

Pereladov A. B. The efficiency of the abrasive tool by optimizing the structure parameters

The article presents the results of the analysis of the negative impact of bundles contained in the abrasive tool performance and machining quality, is proposed to improve its structure. Described conducted studies of disperse systems, consisting of a mixture of abrasive grains of different grit and has more dense structure. Was developed computer and mathematical models to design the tool with a given hardness, but with less volume fraction of bundles in the tool. The method of creating an abrasive tool with a complex grain composition, which allows to solve tasks of optimization of volumes of the components of the abrasive mass, to determine the fill factor of the volume of dispersed elements and other required indicators. Examples of practical use of the developed method-

ology when creating the abrasive tool structures with low content of ligaments.

Keywords: disperse system, bond, abrasive tools, structure, polyfractional structure, computer model.

Gorlenko A. O., Topolyanskiy P. A., Topolyanskiy A. P., Ermakov S. A. Use of tribiological nanocoatings based on silicon compounds to improve service life and reliabil- ity of piston rings

Operating conditions and types of wear of piston rings and grooves under them in a piston, existing technologies of their manufacture and hardening have been considered. The characteristics of SilcoKleanтм1000 multilayer coating from Restek and SilcoTek (USA) from amorphous hydrogenated silicon with a top layer from silicon oxycarbonitride used against carbon deposits of combusted fuel on piston rings and engine pistons have been presented. The concept of selecting the technology and materials for coatings for reinforcement of piston rings has been pro- posed, on the grounds thereof use of the technology of final plasma hardening (FPH) has been proposed in order to reduce consumption of fuel and oil, reduce emissions of toxic substances with exhaust gases, reduce noise and achieve maximum possible power and durability of the motor with application of multilayer nanocoatings based on SilcoPateks (a-Si:H-SiOCN) silicon compounds. The results of studies of tribological properties by the normalized method according to GOST 30480-97 in case of sliding friction, as well as tests in terms of microabrasive wear in accordance with international standard EN 1071-6: 2007 have been presented to evaluate surface properties before and after FPH and application of SilcoPateks coating. The results of the studies confirmed effectiveness of FPH technology and SilcoPateks coating on tribological characteristics and wear resistance in microabrasive wear.

Keywords: piston rings, finish plasma hardening, silicon coating, carbon deposits, tribiological tests and microabrasive wear.

Fedorovich S. N. Current state and perspectives for development of the technology of lapping of precision spheri cal system elements

The analysis of existing methods and means of ensuring the process of finishing and polishing the rotors of electrostatic gyroscopes was carried out. The main directions of research on improving the shape of rotors were suggested.

Keywords: spherical rotor, ball rotor, electrostatic gyroscope, precision sphere, precision ball.