V. N. Loginov, Z. V. Shirokova (Komsomolsk-on-Amur State University, Komsomolsk-on-Amur)

Calculation of the stress-strain state of profile parts during stamping with an elastic medium

The paper considers one of the options for calculating the stress-strain state of a profile blank during stamping with an elastic medium. On the basis of the method of variable parameters of elasticity, a system of equations is obtained and solved for stresses and strains arising in a profile blank under load. In the future, these results are used to calculate the springback of the workpiece after removing the active load.
Keywords: stress-strain state; elastic parameters; elastic medium; equilibrium equations; stresses and strains; differential equation.

G. A. Yudin, S. A. Tyurina, G. Yu. Dalskaya, E. I. Tronza (MIREA – Russian Technological University, Moscow), A. B. Semenov (Bauman Moscow State Technical University, Moscow)

Investigation of the microstructure and morphology of the solid phase of a thixo billet made from AK12M2MGN alloy produced by the cooling trut method

Thixoforming (SSP – Semi Solid Processing, SSM - Semi Solid Metal) – is a chain of sequential processes in which the metal is given the desired shape of the product in one operation and only at the final stage in the solid-liquid state of the material. One of the most important is that the alloy at the beginning of shaping should be a two-phase medium, called a dispersoid, and consisting of a certain amount of spherical solid metal particles floating in a liquid. Today, in the production of precision workpieces, there is competition between SSM technology and traditional foundry technologies, including injection molding, and for this reason, the alloys used in this new production sector should be close in characteristics to those used in traditional technologies. casting.
Keywords: thixo stamping; globular microstructure; structural component of the alloy; suspended metal.

A. E. Tsibulko, E. A. Romanenko (PJSC «NKZM», Kramatorsk, Ukraine)

Transformation of the first classical theory for estimating the strength of ductile materials with a positive spherical tensor

A mechanical transformation of the first classical theory was carried out to assess the strength of plastic materials with a positive spherical tensor, taking into account the modern concept of the scheme of their deformation and destruction.
Keywords: stress state of materials; deformation; detachment; shear.

A. D. Khvan (Voronezh State University, Voronezh); D. V. Khvan, A. A. Voropaev, Yu. B. Rukin, N. S. Pereslavtseva (Voronezh State Technical University, Voronezh)

Plastic compression of long cylinders

The article proposes a method for quantitatively assessing the influence of supporting elements that provide compression conditions under a linear stress state without bending long cylindrical specimens during their settlement using the energy stability criterion. The proposed technique makes it possible to quite simply carry out calculations of geometric parameters when designing devices for uniaxial plastic compression of long cylindrical workpieces.
Keywords: plastic compression; long cylinders; stability; energy criterion; critical stresses; device for compression of long samples.

Yu. V. Ivanov (Udmurt State University, Izhevsk)

Modern directions for improving the vibration characteristics of impact forging and pressing machines

The paper formulates the main directions for improving the vibration characteristics of impact machines. The basic sources of vibrations of forging and pressing machines are specified. Technical devices for controlling vibration flows are proposed.
Keywords: stamping, forging hammers; vibration isolation systems; shock-absorbers; springs.

O. S. Zhelezkov, R. R. Dema, M. V. Kharchenko, I. I. Kinzina (Nosov Magnitogorsk State Technical University, Magnitogorsk); E. M. Martynov (National Research Technological University «MISiS», Stary Oskol Technological Institute (branch), Stary Oskol)

Prediction of the wear resistance of the pressure device nut of the rolling stand

A method has been developed for predicting the wear resistance of a screw pair nut with a thrust thread, which is based on the main provisions of the energy theory of wear of solids. The coefficient of friction and indicators of the energy intensity of wear of the nut material are experimentally determined. Using the finite element method based on the DEFORM-3D software package, the normal pressures on the nut-screw contact surface and the work of friction forces were determined. The life of the nut of the screw pair of the pressure device of the rolling stand of the 2000 hot rolling mill has been calculated.
Keywords: screw pair; nut wear; energy theory of wear; indicator of energy intensity of wear; finite element method; normal pressures; work of friction forces; service life.

E. V. Solovieva (Ivanovo State Power University, Ivanovo)

The effect of polyglycol esters on increasing tool durability and surface quality

The article is devoted to the analysis of the influence of polyglycol ethers on improving tool durability and surface quality. In the process of research the peculiarities of the influence of lubricants-cooling technological means with polyglycol ethers on the cutting force are considered. The results of practical experiments of grinding with different concentrations of polyglycol esters are also given.
Keywords: surface; processing; ester; cutting.

V. V. Mironenko, А. А. Alekseev (Irkutsk National Research Technical University, Irkutsk)

Study of the implementation of machine vision in the production for the control of knots during the assembly of the aircraft guard units

The possibility of introducing devices using the machine vision algorithm in the areas of assembly production of the aircraft airframe is being considered. The article describes the operation and structure of software based on this algorithm and ways to implement it in the operations of controlling the geometric parameters of nodes at the assembly stage. The features of modern methods of marking the node before riveting, as well as the control operations used in production, are given. The tasks of the algorithm are outlined - this is the recognition of the simplest elements of the node in the images (holes, fasteners), the calculation of the dimensions of the elements, the receipt of the coordinates of the elements in space, as well as the reverse process of drawing them according to the coordinates entered into the program to build electronic markup. Experimental tests of the algorithm were carried out on images of 3d models and photographs of nodes, and the measurement accuracy of this method was determined. Comparison of the accuracy of classical markup methods with electronic markup used in the algorithm is made.
Keywords: machine vision; assembly automation; dimensional control; positioning; geometric element recognition; EmguCV; OpenCV.

V. V. Sleptsov (Moscow aviation institute (National research university), Moscow), T. V. Revenok (Moscow state university of civil engineering (National research university), Moscow)

Bactericidal activity and features of the use of silver nanoparticles colloidal solutions obtained by the electrospark discharge method

Combating antimicrobial resistance in pathogens is becoming increasingly important. An alternative direction to existing antimicrobial agents is the use of nanoelement-based drugs. The paper compares the biological properties of liquid media containing nanoparticles of various metals obtained by the electric spark discharge method. It was noted that the size of silver nanoparticles was in the range of 5–10 nm, while the size of clusters of other metals obtained under standard operating conditions of the setup exceeded these sizes. The study of the antibacterial properties of colloidal silver solutions with a concentration of up to 50 mg/l against test cultures of various pathogens showed their pronounced biocidal effect. The effect of the initial state of the reaction medium on the bactericidal properties of the resulting colloidal solutions was confirmed. The tests carried out with cluster silver solutions with a concentration of 50 mg/l, applied to various types of surfaces, revealed a pronounced disinfecting effect on ceramic, steel and plastic surfaces. The creation of biocidal preparations based on nanostructured metal clusters is of interest in the production of safe antimicrobial agents used in clinical practice for the treatment of surgical instruments, medical equipment, equipment for food industry enterprises and the agro-industrial complex.
Keywords: colloidal silver solution; nanosized particles; electrospark discharge method; bactericidal properties; biocidal materials.