bluuebunny/crossref_metadata_2025 huggingface dataset:
Modelling the dynamics of an undercar generator with a v- belt drive of an isothermal railway vehicle
Authors: Bulavin Y P , Voron O A , Volkov I V
Published: January 2020

In this research work, mathematical modelling has been performed and the oscillations of the isothermal railway vehicle on the KVZ-I2 bogies with the v-belt drive of the undercar generator have been investigated. As a result, the natural frequencies of oscillations of the railway vehicle have been determined, the crew oscillations caused by random track irregularities have been investigated, the influence of the irregularities of the bogie frame on the generator oscillations has been evaluated.
Inverse Kinematic Problem of Movement of Six Degrees of Freedom Robotic Arm (Solved by a Numerical Method)
Authors: Kochetkov A V , Salov P M , Zakharov O V
Published: January 2020

Robot manipulators are widely used in engineering for solving various tasks in accordance with their purpose. Manipulators usually consist of sequentially connected rigid links and connections between them – joints. One of the most complex types of robot manipulators is the articulated robot, also called the Robotic Arm. It has a structure similar to a human arm with three rigid links and only rotational joints. Such a structure provides greater flexibility, manageability and versatility. At the same time, the accuracy is reduced and the kinematic calculation is complicated. The direct kinematic problem is fairly well known and is uniquely solved using Euler angles or quaternion matrices. At the same time, the inverse kinematic problem has a multivariate solution and, therefore, it must be an optimization. The article proposes a new approach to solving the inverse kinematic problem based on numerical methods and parametric optimization. Formulas of transformations of Cartesian coordinates for a direct kinematic problem act as a mathematical model. However, in the formulas, the angles of rotation of the joints are unknown. Their values are determined during the minimization of the objective function in the form of a sum of squares of the difference between the specified and obtained Cartesian coordinates of the end-effector. The article describes a robot with 6 Degrees of Freedom. Based on the above approach, modeling was performed in the MATLAB software environment. It is proposed to use the sum of the angles of the links of the robot as an optimization criterion. Analysis of the results showed that the optimal solution allows reducing the rotation angles of all links of the robot approximately two times.
Wear-resistant coatings based on niobium nitride
Authors: Tabakov V , Chikhranov A , Dolzhenko Y
Published: January 2020

The results of studies of the use of niobium nitride and its modifications as a material of wear-resistant coatings are presented. It is shown that coatings based on niobium nitride have higher values of mechanical properties. The use of such coatings changes the thermal and stress state and increases the shape stability of the cutting wedge of the tool, which reduces the intensity of wear.
Modeling of a high-power heating unit with pulse-width modulated control
Authors: Goltsov Yu A , Kizhuk A S , Rubanov V G , Yanochkina O O
Published: January 2020

We constructed a heating unit that can be used for provide the desired temperature regime of the technological equipment. Such type of a heating unit allow us to obtain a higher efficiency which is ensured by using a high-frequency switching power electronic converter with pulse-width modulated control. In this paper we also describe the transitions from regular periodic mode to chaos that can be observed in this high-power heating unit. The behavior of such a system can be described by a set of two coupled differential equations with discontinuous right-hand sides. We show that the transitions to chaos in this system are associated with the interplay between classical smooth bifurcations on one side and different forms of border-collision bifurcations on the other.
The laser-plasma cementation as a method of increasing the abrasive resistance of medium-alloy tool steels
Authors: Marinin Evgeny , Gavrilov Gennady , Belashova Irina
Published: January 2020

The paper is devoted to the study of resistance of medium alloy tool steels after laser-plasma cementation. The authors propose a method of increasing abrasive resistance by means of the combined effect of DC electric arc of reverse polarity and laser radiation. The increased concentration of carbon in the near-surface layer is provided by the erosion of the carbon electrode and melting due to the combined energy effect of laser radiation and electric arc. The formation regularities of the diffusion hardened layer are established. The modes of laser-plasma cementation and test results of the studied materials are presented. The reasons of resistance increase are revealed. The mechanical characteristics of the hardened surface layer are shown. The influence of the energy regimes of the technological process on the depth of the diffusion hardened layer is given.
Method for regulating welded deformations by local thermal extension in titanium alloys welding
Authors: Astafeva N A , Buzin A S
Published: January 2020

The article presents the results of the study of the influence of welding conditions on welding deformations of Ti samples. Welding using a non-consumable electrode in shielding gas was aimed at obtaining thin ribbed samples used in the aircraft building industry. The difficulty of welding a sheet with a stiffener is due to the occurrence of defects: changes in the surface geometry (angular deformations). The article aims to assess capability of controlling welding deformations using a tail heat sink due to local thermal tension for Ti alloy welded joints. The effect of welding conditions on the value of angular welding deformations of samples was determined. The best results were obtained for parts produced using a device designed by the author. The device combines gas protection of the cooling section of the welding joint and contributes to local thermal tension. The X-ray control did not identify internal defects in the joints produced by the standard method and the method using a tail heat sink. The tests showed that the use of a tail heat sink does not affect the structure and properties of welded joints made from the Ti-Al-Zn system alloy. The experiments proved the efficiency of the method for controlling welding deformations using a tail heat sink.
Improvement of operational characteristics of the assembly tool equipped
Authors: Artamonov E V , Tveryakov A M , Shtin A S
Published: January 2020

The article describes the studies of the performance of tool hard alloys using two different methods based on mechanical and physical properties. The studies were carried out in laboratory conditions without the use of metalworking machines, which is an undoubted advantage over persistent tests, where a lot of trial processing is necessary to assign rational operating conditions. A comparative analysis of the obtained experimental studies of the electromagnetic properties of replaceable cutting inserts made of tool hard alloys with the known results of studies on impact strength is given. The comparison results showed that the change in the state of the hard alloy diagnosed by impact strength correlates well with the results of studies of electromagnetic properties depending on the temperature in the range specific to the cutting process of materials. The data obtained with high accuracy make it possible according to the test results to assign rational processing modes corresponding to the temperatures at which the maximum operational characteristics of the tool are observed. As a result of the study, a scientifically based method for choosing rational performance processing was obtained, which is based on the physical and mechanical properties of tool materials, reacting to the structural changes during operation under the influence of high temperatures, and allowing to assign performance conditions providing the conditions to get maximum tool operability.
Production of Aluminum Matrix Composite Material by Internal Oxidation
Authors: Romanov A D , Romanova E A , Chernyshov E A
Published: January 2020

The scope of the use of aluminum-alloy-based metal-matrix composite materials has been expanding in recent years. However, the high cost of raw materials is a considerable deterrent to the widespread implementation of products made of such composites. Therefore, the ranges of the said materials commercial application are yet inadequate to their technical and operational capabilities. So, methods of making metal-matrix composite materials directly from a liquid melt are currently of interest. This paper presents the theoretical studies and the results of practical experiments for the production of metal-matrix composite material by the internal oxidation method. There are described the results of mechanical tests and the microstructure of specimens confirming theoretical assumptions in the oxidation of aluminum melt array. A comparative analysis is given for the cost of producing an alloy containing 30% of Al2O3 particles obtained by adding the Al2O3 powder and an alloy obtained by the internal oxidation of the aluminum melt. The studied technology provides for the formation of aluminum oxide directly in the aluminum melt, thus enabling to produce a composite material by a single-stage process and ensuring the process efficiency.
Strength, ductility and impact toughness of tube steels after hot rolling
Authors: Platov S I , Nekit V A , Maslennikov K B
Published: January 2020

The article is devoted to the study of mechanical properties of pipe steels after rolling on a broadband hot rolling mill. Using the methods of mathematical statistics, a close pair correlation between all the characteristics of the mechanical properties of hot-rolled sheet pipe steel is revealed. The results are obtained in production practice, they create additional opportunities to verify the results of expensive mechanical tests of pipe steels in order to reduce the cost of testing and improve the reliability of the results of their evaluation.
Simulating the rheological behaviour of an AlMg6/10% SiC metal matrix composite under high-temperature deformation
Authors: Smirnov A S , Konovalov A V , Muizemnek O Yu
Published: January 2020

The study presents the verification of a structural-hierarchical model of flow stress designed to describe the rheological behaviour of metal matrix composite materials. In the study, a composite with a matrix based on the AMg6 alloy reinforced with 10% silicon carbide is a model material. The model has been verified by experimental data obtained at a deformation temperature of 400 °C for strain rates ranging from 0.1 to 5 s-1. The identification results have shown that the model can be used to describe the rheological behaviour of metal matrix composites based on the AMg6 alloy under high-temperature plastic deformation.
Preparation and carring out of tests to assess the operation modes of a medium-duty cargo vehicle transmission
Authors: Toropov E I , Tumasov A V , Moshkov P C
Published: January 2020

This article discusses the achievements of Nizhny Novgorod State Technical University n.a. R.E. Alekseev specialists in the field of medium-duty truck Gazon Next testing in order to determine the engine operation modes and mechanical transmission in conditions close to operational. The latest achievements of measuring technologies for assessing the car performance properties are shown. The experimental characteristics obtained are necessary for the mechanical transmission robotic kit development.
Experimental studies of the snowmobile engine rubber-metal vibration dampers specifications
Authors: Diakov Aleksey S , Pozdeev Aleksey V , Lyashenko Mikhail V , Moskovskii Iaroslav V
Published: January 2020

The paper presents the methods and results of experimental determination of performance curves (flexibility and amortization characteristics) of two types of snowmobile engine rubber-metal vibration dampers with their stand radial and axial loading at different vibration amplitudes and frequencies using Macron BISS-ITW tensile testing machine. The obtained results were analyzed.
Hub dynamometric stand test features of the ATV engine and continuously variable transmission unit
Authors: Diakov Alexey , Salykin Evgeny , Potapov Pavel
Published: January 2020

This article discusses the ATV V-belt variator test features using hub dynamometric test stand. The problems encountered related to obtaining the necessary data for testing and ways to solve them are described, the test methodology, as well as examples of test results with their analysis are presented. The results of the study of the ATV transmission ratio are presented.
Development of CAD elements for automated selection component parts during assembly multi-bearing unit of an internal combustion engine
Authors: Petrukhin A V , Saninsky V A , Korzin V V
Published: January 2020

The article describes the implementation of the task of computer selection of component parts of multi-bearing units when using the computer-aided design system for internal combustion engines. Describes the elimination of harmful technological heredity of production of machines at the assembly stage, by means of an automated selection of liners to compensate for errors in the supports of crankcase, using the proposed mathematical model. A method for determining the optimal assembly option using an automated process control system for assembling multi-bearing support units is given. Given the functional structure of the system, illustrates the composition and application of elements of CAD in the framework of the proposed approach.
Effect of structure and texture on failure of pipe steel sheets produced by TMCP
Authors: Lobanov M L , Danilov S V , Urtsev V N
Published: January 2020

The method of orientation microscopy (EBSD) is used to study the structure and texture of low-carbon, low-alloy pipe steel sheets processed by controlled thermomechanical processing (TMCP). The temperatures of isothermal hot rolling varied. Samples cut from sheets showed a different properties during mechanical testing. The formation of cleavages (secondary cracks) during failure of steel is related to the presence of ferrite grains with orientation {001}<110> extended in the hot rolling direction. The formation of grains is a consequence of the isothermal hot rolling below the temperature Ac3 at TMCP.
Anticorrosive protection of the steam generator of the heat exchanger by the high-temperature oxidation method
Authors: Krivina L A , Tarasenko Yu P
Published: January 2020

The paper proposes a method of protection of steam generator tube systems from hot-salt corrosion that occurs during their operation. This method is based on heat oxidation, in which an anticorrosion oxide film of TiO2 type is formed on the surface of the tubes.
Development of a structurally similar element of a helicopter blade with an active twist system
Authors: Anoshkin A N , Barkanov E , Pisarev P V , Ashikhmin V A
Published: January 2020

A mathematical model is formulated for calculating the stress-strain state (SSS) of piezoelectric layered polymer composite materials (PCM) equipped with a control piezoactuator. The model implements the principle of thermo-piezoelectric analogy, which allows to move from the coupled boundary value problem of electroelasticity to the boundary value problem of thermoelasticity. The mathematical model was tested with a numerical calculation of the mechanical behavior of a sample structurally similar to a rotor blade, equipped with control piezo-actuators and made of equal strength and unidirectional fiberglass.
Calculation of the acoustic efficiency of smart resonant cells
Authors: Pisarev P V , Maksimova K A
Published: January 2020

In this work, numerical studies of the acoustic efficiency of prismatic resonators with adaptive neck diameters were carried out. In the process of research, the physical and mathematical models for predicting effective acoustic characteristics of a group of sound-absorbing structures cells with different neck diameters were formulated. The concept of the resonant frequency adaptive control and impedance of smart SAS cells by means of piezoelectric elements embedded into the neck is proposed. Verification of the developed numerical models has been carried out. According to the results of the numerical calculations, the dependences of the natural frequencies and sound absorption coefficients of the group of adaptive SAS cells were obtained for different variants of control modes (combinations of resonator neck diameters).
Numerical study of non-linear deformation processes of porous concrete
Authors: Balafendieva I S , Galimullin I A , Bajtemirov I K
Published: January 2020

In the work, on the basis of the determining relations between the increments of the true stresses and strains, in the framework of the finite-element discretization of the computational domain, the method of solving geometrically and physically nonlinear problems of the mechanics of a deformable solid body is implemented. A number of model problems of deforming elements of three-dimensional elastoplastic structures from solid and porous materials have been solved. It may be noted that there is a good agreement between the numerical results obtained by the proposed method and known solutions; some regularities of the deformation of structural elements made of porous materials were found.
Application of a decision support system in an industrial enterprise
Authors: Medvedev S N , Aksyonov K A , Aksyonova O P
Published: January 2020

Work at an industrial enterprise is associated with the constant adoption of management decisions at all levels, on which both the timeliness of order fulfilment and the efficiency of production capacity depend. The use of modern information technologies based on mathematical methods, allow you to make a decision knowing what should happen.
The design of the guide frame of the tunneling shield for laying communications under the riverbed
Authors: Letopolsky A B , Korchagin P A , Teterina I A
Published: January 2020

The article presents the option of improving the working equipment of the tunnel-boring complex for laying underground utilities, including trunk pipelines. The method of trenchless laying of underground utilities, consisting in a combination of methods of horizontal directional drilling and micro-channeling, is proposed. The proposed technology does not require the construction of a preliminary mine and a site for the installation of a drilling machine and allows one to combine in one working step the drilling of a well, the laying of a pipeline, welding and insulation works. Presents calculations aimed at determining the forces of movement of the shield, the definition of the power of the shield, as well as the calculation of the strength of the shield. The technique of carrying out technological operations is demonstrated taking into account the use of the proposed technical solution.
Study of efficiency of a 6x6 all-terrain vehicle in coastal zone
Authors: Belyaev A M , Belyakov V V , Makarov V S
Published: January 2020

In the paper, we consider relevance of autonomous mobile robotic system (AMRS) for coastal zones monitoring development. AMRS developed in Nizhny Novgorod State Technical University n.a. R.E. Alekseev is presented. General chassis characteristics are provided. The paper establishes four indicators of mobile chassis power efficiency: tractive force reserve under various operating conditions, tractive force for the certain probability of all soil surfaces, fuel consumption efficiency per 100 km, and the same indicator related to the carried load mass unit. Calculations based on the abovementioned indicators are made for 6x6 chassis, and for the track mover modification. The results show that on sand-gravel and sand roads power efficiency of wheeled chassis is 17-18% higher.
Development and research of functional coatings with laser modification
Authors: Gavrilov Gennady , Belashova Irina , Marinin Evgeny
Published: January 2020

The paper presents the study results of functional coatings of steel 45 formed by Ni, Cr, Mo, W alloying. The mechanical properties and relative resistance of steel 45 after alloying with these elements are presented. It is shown that the alloying coating thickness influence on the thickness of the functional coating. The analysis of the microstructure in the alloying area shows that the mass transfer of alloying components is realized mainly due to the convective motion of the melt. The surface tension of the melt depends on the temperature and the heterogeneity of the free surface heating of the alloying area. It was also found that the degree of hardening, the thickness and the microstructure of laser alloying depends on both the type of alloying component and the properties of the matrix material. The thickness of the alloying area depends not only on the thermophysical characteristics of the system but also on the energy parameters of the laser radiation.
Lay-out of cutting blades in an assembly basic rack of a counterpart rack for hob gears
Authors: Artamonov E V , Kireev V V , Zyryanov V A
Published: January 2020

Nowadays many Russian tool-making facilities which produce a metal-cutting tool for a processing of coarse-pitch tooth-wheels do not offer constructions of assembly hob gears with replaceable hard-alloy carbide blades. Creation of the assembly constructions for machine-building enterprises with the replaceable hard-alloy carbide blades (RHACB) is an effective solution for the processing of tooth wheels. Thanks to it productivity existing equipment increases many-fold, economical effectivity caused by implementation of the high-capacity tool allows to purchase modern equipment and make work of machine operators more effective and less labour-intensive. In this paper we offer a radical technical solution which allows to increase production efficiency of mechanical processing by a tool with lay-out of the hard-alloy carbide blades in the assembly basic rack of the counterpart rack in hob gears. Implementation of a group scheme in the assembly counterpart cutting rack is reached by means of usage of big amount of basic and side carbide blades on an Archimede’s tool worm that allows to cut away surplus consecutively and decrease depth of cut on the carbide blades. Also it allows to provide evenness of cutting and also decrease a value of blow stresses on cutting elements of the assembly tool. Due to usage of the replaceable hard-alloy carbide blades resistance and reliability of the assembly gear hob increases.
Parameters of loading equilibration in a tube cold pilger mill drive
Authors: Buinachev S K , Chechulin Yu B , Bakin A V
Published: January 2020

On the basis of the variational approach and the Gauss-Seidel method there are proposed a technique and a mathematical model for determining the optimal parameters of dynamic load balancing systems on the crankshaft on the example of the cold rolling mill tube with reciprocating motion of an executive element in the form of a large mass working stand. The most compact scheme with the orthogonal motion of the executive element and the balancing load was chosen as the dynamic balance system. Variable parameters include dezaxial values, misalignment angle of cranks, weight of counterweight and balancing weight, lengths of connecting rods of executive and balancing mechanisms. For the existing series of sizes of cold rolling tube mill as the mass and speed of the rolling stand increase, the proportion of dynamic and technological components of the reduced load and respectively the kinematic scheme of the balancing mechanism changes. In this case, the structure of the loading and a set of variable parameters remain unchanged. Therefore, the proposed mathematical model of dynamic programming retains the universality of finding the minimum of maximum of the resulting load.
Numerical simulation of diamond powder separation by particle shape and size
Authors: Kurnenkov A V , Shurigin A Yu , Glebov V V
Published: January 2020

The paper presents the finite-element modeling results of classifying diamond microgrit grains, using a rotary type separator in software ANSYS Fluent. The authors obtained the following results: distribution of air flow velocities, grain motion trajectories in the liquid film and in the air when ejecting from liquid, depending on their size and shape for synthetic diamond powder grit size80/63.
Theoretical and experimental research on pressing process of porous bodies made of MR wire material
Authors: Lazutkin G V , Davydov D P , Shchemelev V I
Published: January 2020

The article represents the main principles of the theory of pressing process of products made of MR fiber material. It is showed that the equations of ideal (excluding external frictional force) pressing process of products made of MR material are represented as power function of pressing pressure depends on density of porous body. The power function of the hardening of the wire material in compact is determined. It is established that the ideal pressing process contains two stages in the range of relative densities of porous bodies [0.15; 0.7]. The main equation of pressing process of products made of MR is obtained. Experimental proof of hypotheses and assumptions confirmed their validity.
Parametric optimization of the thermal processing of foam glass on basis of heat transfer models
Authors: Fedosov S V , Bakanov M O , Nikishov S N
Published: January 2020

The foam glass is one of the most prospective materials in the market of vitro-crystalline building materials. To achieve optimal physical and technical parameters of foam glass, the development of technology that will regulate the processes of heat treatment of the raw material mixture to produce foam glass without reducing its performance is required. Foaming process is an important parameter in the foam glass technology. The temperature of the raw material mixture changes from the surface layers to the center of the backfill during foaming, the activation reaction of the gasifier thermal decomposition proceeds similarly, which can result in the material uneven air-entraining. Mathematical model presented in this paper makes modeling the distribution of temperature fields at the contact boundaries of the metal mold for foaming and the raw material mixture for the foam glass production as well as prediction of the further temperature changes in the raw material mixture, which is the key factor in the formation of a uniformly porous final product, possible.
A method of determination of average plane of taps of pipes by triangulation method using an anthropomorphic robot
Authors: Lubimyi Nickolay , Chetverikov Boris , Chepchurov Mihail , Odobesko Ivan
Published: January 2020

Nowadays there are various manufacture methods of pipe taps. One of the most laborious operations during manufacture is a marking of pipe taps for subsequent machining. Work layout operations are performed using special tool ware and outfit. These operations are performed manually and it leads to the decrease in accuracy and to the increase of laboriousness. The authors suggest the method of determination of the latent base of pipe tap (average plane) using an anthropomorphic robot. The results of research would help to make the virtual calculation of tool position of the anthropomorphic robot for marking and to generate the robot trajectory. Ultimately, such research would also decrease laboriousness and increase accuracy of marking operation. Materials and methods. The authors supposed to use latent base, namely the average plane of the pipe tap as a measuring base. The robot is calibrated from the base plane placement and chooses the shortest circular arc by comparative approach. Therefore, such shortest arc would form the average plane. The authors carry out the determination of the curve line length by the triangulation method using the interferometer. Results. The result of the research is the technology development for determination of latent base in the average plane form. Discussion and conclusion. The proposed method of latent bases determination of pipe tap would allow making the automated system of marking of pipe taps. Moreover, such method would help to reduce time of performing operations as well as to decrease the manufacture laboriousness on the following stage of technological process.
Fine-grained limestone concrete with improved dissipative properties
Authors: Belov V V , Kuliaev P V , Artemiev A A
Published: January 2020

Crack propagation in concrete is known to be partially stipulated by the process of energy dissipation. In this study the usage of complex admixture including limestone fines and superplasticizer which enhance crack propagation energy dissipation rate is discussed. Energy dissipation rate and crack propagation are assessed by comparing cracking strains and stress intensity ratios for two sets of specimens, with and without limestone fines. Limestone semi-inert filler acting in a synergetic way with superplasticizer is revealed to enhance crack propagation energy dissipation rate and cracking strains, which makes fine-grained limestone concrete the effective crack-resisting material.
Polyurethane composite mortar for expansion joints on road bridge structures
Authors: Izmaylov I A , Rozovskaya T A , Dolinnaya E N
Published: January 2020

The article analyzes the main reasons for the low durability of road pavement in the zone of expansion joints. The main prerequisites for the use of polymer-based compounds for filling the transition zone between the asphalt concrete pavement and the metal profile of the expansion joint are considered. The results of the study of physical, mechanical, and operational properties of the polyurethane-based compound are given, and the increased durability of the proposed solution is justified compared to traditional solutions. A feasibility study of the above solution has been completed. A technical solution for the design of an expansion joint transition zone is proposed.
Mathematical model of surface roughness at a flat grinding by periphery of a circle of metal-polymer parts
Authors: Lubimyi Nickolay , Odobesko Ivan
Published: January 2020

This scientific work focused on determination grinding modes for metal polymer products that are filled aluminium. Also it is necessary to ensure required surface roughness and the highest performance. We used three factor planned experiment to get equation surface roughness metal polymer product at a flat grinding. The analysis and processing the results of the experiment was performed using statistical methods. Preparation of the products for experiments based on previously obtained scientific data. We used only calibrated measuring instrument for taking readings. In this scientific work was obtained the equation of surface roughness and table feed and cut depth at flat grinding of metal polymer products. Also it’s been got values of grinding modes of metal polymer surfaces on the joint of the molding tool, according to required surface quality. An obtained curve was built.Comparisons with common relationships are made. The scope of the results has been determined. The values of grinding modes for processing metal polymer surface on the joint of the molding tool based on surface roughness also given in the scientific work.
Innovative priorities for power engineering
Authors: Vorontsova O , Nazarenko N , Lepetikova I
Published: January 2020

The article describes the features of the development of power engineering as one of the key industries that ensure stable economic growth in conditions of a high dependence of the Russian Federation on energy exports and world energy markets.
Automation of the process of determining the errors of the installation of blanks for CNC machines in unmanned industries
Authors: Kozak Nikolay , Stas Anna , Obukhov Alexander
Published: January 2020

In article an analysis of the errors, which are determining by the cycle of position’s monitoring of workpiece, was done. The usage of this cycles and details was described. Proposed the technique of using the cycle and adding new user elements. Illustrated the application of the cycle in the NC program when installing workpiece on the table of a machine tool.
Real-time cutting simulation based on voxel model
Authors: Obukhov A I , Evstafieva S V , Martinova L I
Published: January 2020

The article discusses the approach to the implementation of cutting simulation in the CNC system. Simulation of cutting before starting the actual machining of the product allows you to avoid many errors associated with the positioning, reorientation of the tool, check the correctness of the tool’s approach to the workpiece, etc. This becomes especially relevant in multi-axis machining [1-4]. The advantages of presenting a product model using a sparse voxel octree are considered.
Development of a platform for collecting information on the operation of technological equipment with the use of Industrial Internet of Things
Authors: Martinov G M , Kovalev I A , Chervonnova N Yu
Published: January 2020

The article discusses the approach to collecting and aggregating data from sensors located on heterogeneous technological equipment using the principles of the industrial Internet of things. The main analytical data processing platforms are considered, the advantages of using ready-made and own solutions are shown. A practical example of the collection of parameters from a planer-milling machine with their subsequent analytical processing, which revealed the need for unscheduled technological maintenance of the spindle assembly, is presented.
Development of standardized tools for shopfloor programming of turning and turn-milling machines
Authors: Martinova Liliya I , Pushkov Roman L , Fokin Nikolay N
Published: January 2020

The problems of using CAM-applications for shop floor programming are studited. The reasons of problems of transfer of the created control programs from one CNC systems to another are revealed. A solution for unifying the format of recording of machine cycles is proposed and its applying for different CNC systems is demonstrated..
Non-Cylindricity of Holes Formed with Robotic Complex
Authors: Dudarev Aleksandr , Svirshchev Valentin , Makarov Vladimir , Podvintsev Aleksandr
Published: January 2020

The article describes the technological features of the formation of holes with the help of the created robotic technological complex based on a Kuka robot. The robotic complex for machining allows you to drill holes in the Helmholtz resonators to absorb noise in shells made of polymer composite materials (GFRP and CFRP) of aircraft engines. Holes for noise absorption with a diameter of 1.6–2 mm are required to be shaped in a significant array; 200-300 thousand holes must be drilled on one shell. The technological problems arising from the robotic drilling process are noted. One of the problems is the deviation from the cylindricity of the formed holes, the deviation arises due to the kinematics of the robot. A technical solution to this problem is proposed.
Automatically search of a rational cutting mode for milling non-rigid blanks with the specified quality parameters
Authors: Nazarov M V , Savelev K S , Kiselev E S
Published: January 2020

The work is devoted to the question of lowering the cost of production engineering products by reducing the costs of technological training. The possibility of cutting mode selection based on the quality of the processed parts using the proposed methodology for determining the roughness, elastic deformation of the item in the process of mechanical machining non-rigid parts of machines and technological level of residual stresses. The algorithm search automation rational cutting mode a brute-force attack all possible combinations of milling with calculation mode settings for each of the required quality parameters. Shows his work in appointing cutting mode for accommodative wall milling on aluminum alloy billet D16T.
Numerical investigation of cracked rotor
Authors: Abed Salam Ahmed , Bahrami Mohammad Reza , Thijel Jassim Farij
Published: January 2020

The aim of this paper is investigating the cracked Jeffcott with an offset disk rotor system. The finite element method (FEM) used in ANSYS gives an attractive approach for modeling the rotor dynamic system. The effect of changing speeds has been analyzed on the dynamic parameters of journal bearings (stiffness and damping) and then on Sommerfeld number. The relation of the dynamic bending stress with the static stress of rotor with cracks (dynamic load factor (DLF)) and with the ratio of depth crack to radius rotor has been established. The results have been obtained numerically by using ANSYS. The results show when crack’s depths increase the DLF increases and reach to maximum when a/R = 0.8.
Study of the process of tool forming made of high-strength materials
Authors: Lobanov Dmitry , Yanyushkin Alexander , Muliukhin Nikolay , Skeeba Vadim
Published: January 2020

The work covers the problems of forming tools cutting elements equipped with high-strength tool materials as exemplified by hard alloy tools for machining of non-metallic composite materials. The reasons for the formation of various defects, such as chips, cracks, breaks, burns, unwanted interphase structural transformations in the surface layers and the formation of high residual stresses in the wedge in areas where the grinding wheel contacted with the element being sharpened are indicated. The need for a comprehensive assessment of the quality of cutting blade shaping is noted. The need of technological system modeling of an abrasive tool - machined high-strength material is substantiated, since conducting of a comparative analysis of forming cutting elements methods from high-strength materials empirically is a rather long, laborious and economically inefficient process. At the same time, a detailed study of the regularities of stress-strain state formation in the elements of the cutting tool from difficult-to-work tool materials during grinding is required. The initial data are determined and restrictions are imposed on the system under study. The accepted assumptions do not limit the processes study, but allow us to estimate the contact processes occurring in the cutting zone. A method for the tool forming modeling process equipped with high-strength, difficult-to-work materials is given. The constructed model will allow: 1) to determine the rational ranges of technological machining modes, which will ensure the formation of a high-quality cutting edge during the sharpening process; 2) to carry out a comparative analysis of the methods of grinding tools equipped with cutting elements of high-strength materials, with the aim to choose the most favorable method for sharpening at the preliminary stages of technological preparation of tool-making facilities; 3) reduce the amount of empirical research, which in its turn will reduce the time spent on research, material consumption and improve the economic efficiency of research, due to reduced number of the experiments series.
Ways to implement hybrid finishing technology with a hand-held rotary tool
Authors: Lobanov Dmitry , Borisov Mikhail , Yanyushkin Alexander , Skeeba Vadim
Published: January 2020

In some segments of mechanic engineering: instrument-making, shipbuilding, automotive, aviation, aerospace industry there is a need for finishing processing of difficult to access surfaces of complex configuration. If it is not possible to process such surfaces on the equipment, then a manual rotary tool is applied. Such tools, in particular, include drills and engravers equipped with a grinding and polishing tool. If, using a manual rotary tool, the electrochemical grinding and electrochemical polishing are consistently applied, then it is possible to synthesize a hybrid technology for the electrochemical processing of complex profile metal products combining the advantages of each type of processing. The presented work is devoted to the development and study of ways to implement hybrid technology for finishing with manual rotary tools. The work provides a schematic diagram of the device and description of its operation. Analysis of the research results allows us to conclude that the hybrid technology allows to achieve a surface roughness of an average of Ra 0.25 μm and be successfully implemented when processing difficult to access surfaces of items of complex configuration with a manual rotary tool.
Automated Smart Quality Control of Commercially Manufactured Peltier Elements
Authors: Yudin Igor A , Tokarev Anton N , Bozhko Yuri V
Published: January 2020

In contemporary technological development there is a tendency to miniaturize and improve the efficiency of modern devices and information measuring systems, this trend affects not only aspects of electronic instrumentation, mechanical systems, mechatronics systems and microelectromechanics, but also systems for transfer and transformation of heat energy, accumulation and redistribution of heat fluxes, and miniaturization of cooling systems and improving the design of heat pumps. One of the contemporary ways of development of structure of heat transfer systems and transformation of thermal energy are elements based on the Peltier effect. We present the automated smart quality control system of commercially manufactured Peltier elements designed at the Department of Engineering Science and Technology of National Research Nuclear University MEPhI. The technical characteristics of our system and its functionality guarantee control and measurement of parameters of commercially available Peltier elements, production and interoperability control in the production of the elements as an electronic component base; production of precision equipment that requires the application of systems to maintain accurate temperature conditions, such as thermal imagers, laser projectors, mobile computing systems.
Study of the influence of technological, structural and operational parameters on the efficiency of the water-ice jet cleaning process
Authors: Prezhbilov Alexander , Burnashov Mikhail , Stepanov Yuriy
Published: January 2020

Nowadays, waterjet technologies find their use in various fields of manufacturing. Many areas of application of these technologies are well studied, documented and implemented. However, there are still applications of using a high-pressure water-ice jet that have not been studied yet. One of these applications would be the water-ice jet cleaning of the surfaces of machine parts with jets utilizing prepared in advance ice particles.
Heat transfer of flooded impact jets
Authors: Fedorovskiy Konstantin , Fedorovskaya Nadezhda , Burkov Dmitriy
Published: January 2020

This paper presents the results of experimental studies on providing heat to the inner surface of the shell plating of the ship through the use of impact jets. In this work, we carried out (by taking into account the existing design features) a modeling and a study of the flow and heat transfer of flooded jets that flow over a flat surface and then spread radially. The visual study revealed different patterns of radial flow of the wall jet. Critical Reynolds criteria and relevant summarizing similarity equations describing heat transfer are determined.
Spectral characteristics of noise during hardening of welds of rod structures
Authors: Beskopylny Alexey , Meskhi Besik , Chukarin Alexander , Isaev Alexandr
Published: January 2020

The article deals with the task of forming a noise spectrum during the processing of parts by the method of surface plastic deformation using a ball-core hardener. Processing using this method is used to harden both flat and curved surfaces, create compressive residual stresses, smooth out cavities, apply a regular microrelief on friction pairs, and also to process welds. The treatment process is accompanied by a loud noise, which mainly exceeds the standard values in the working area of the operator. The results of experimental studies of the spectra of noise and vibration to ensure acoustic safety are presented. The evaluation of the formation of the sound field in the working area of the sources considered. In the course of experimental studies, hazardous and harmful production factors arising from the implementation of machining welded structures were identified. The results of measuring sound pressure levels at the operator’s workplace during compressor operation and the processing of welds of channels and angles are presented. The obtained data are compared with theoretical conclusions about the laws governing the formation of noise spectra and the contribution of noise sources to the sound field at the operator’s workplace.
Improving the accuracy and quality of machining by controlling the cutting process
Authors: Bobrowskii Alexander , Drachev Oleg , Kravtsov Alexey
Published: January 2020

The development relates to machine tool construction, in particular, to the technological processes of chip removal with automatic control of technical process parameters. The installation allows you to automatically manage the process of turning. New in the process of turning is that the position of the cutter in the ZOY plane is changed directly in the cutting process, which reduces cutting forces. Registration of which is carried out by an indirect method based on the analysis of vibroacoustic emission, and is corrected by information about the torque on the main drive of the machine. The installation is a tool rotation mechanism, in which the worm-worm sector, is equipped with a controlled drive and a feedback control circuit on the position of the worm.
Structural optimization of a light aircraft composite wing
Authors: Aung Phyo Wai , Tatarnikov Oleg , Aung Naing Lin
Published: January 2020

This paper presents the results of structural optimization of a two-spar composite wing for a light aircraft. Different lay-up structures of power components such as spars, ribs and skin panels was considered. The problem of optimization was solved using Pareto optimization method with two criteria: minimal wing weight and minimal wing deflection under aerodynamic load. The angle of ply orientation and power components thicknesses were considered as the optimization parameters. It was shown that the use of the optimized wing from carbon composite could reduce up to 60% of the wing weight comparing with aluminium one. The stress-strain and buckling analysis of the wing and its power components were carried out in FEMAP software package.
Ensuring the required manufacturing quality of hydraulic-cylinder rods in mining machines
Authors: Sevagin S V , Mnatsakanyan V U
Published: January 2020

This article presents the results of experimental studies of the finishing treatment by hard turning of the chrome-plated surfaces of critical elements of hydraulic drives of mining machines and hydraulic distribution systems. It was revealed that in the process of galvanic chromium deposition on the working surfaces of the rod and other parts subject to intensive wear, along with provision of physicomechanical and operational characteristics of the surface layer, there is also formation of unacceptable macrogeometric deviations of the parts’ surfaces that are commensurable with the tolerance on the strengthened surface size. It is shown that the deviation from roundness (ovality) formed during chrome plating of the rod’s cylindrical surface is successfully eliminated by hard turning with the cutters equipped with cubic boron nitride plates. At the same time, along with ensuring the specified parameters of dimensional accuracy and geometric shape, the required roughness of the processed surfaces Ra is within 0.32 … 0.26 μm. Thus, the hard turning method can be reasonably recommended as an alternative to polishing, which is widely used after chrome plating of surfaces.The paper presents the methodology of the experiment, the geometrical parameters of cutting plates and technological processing modes, providing the required geometric accuracy and roughness of chrome-plated surfaces.