A. I. Kanareykin (Russian State University for Geological Prospecting (MGRI), Moscow)

The influence of geometric parameters of the cutting wedge of the tool on the friction force and its components

The paper considers the influence of the geometric parameters of the cutting wedge of the tool on the friction force and its components. As is known, the most important factors affecting both the intensity of wear and the magnitude of the stress components in the cutting wedge are the level and distribution of contact loads on the cutting surfaces of tools. The paper shows that the geometry of the cutting part significantly affects the forces and contact loads on the front and rear surfaces. Also significantly affecting the intensity of wear and the strength of the cutting part, contact loads also largely determine the quality of the treated surface. Therefore, the results obtained can be used to optimize rough turning processes.
Keywords: cutting wedge; cutting tool; contact processes; cutter wear; chip formation.

A. I. Kanareykin (Russian State University for Geological Prospecting (MGRI), Moscow)

Non-stationary heat transfer process during external heating of cylindrical bodies

The work is devoted to the issues of thermal conductivity. It describes in more detail the process of heat transfers during external heating of cylindrical bodies. In this case, the process is non-stationary. The analytical expression of an axisymmetric temperature field in a solid cylinder is obtained using the Laplace transform method. Special cases were also considered.
Keywords: heat transfer; temperature field; Laplace transform method; Bessel functions; cylinder; Fourier criterion.

D. V. Evdokimov (Bauman Moscow State Technical University, Moscow)

Study of the method of assessing the deviation from the roundness of the ring during rolling

The paper considers the causes of the appearance of geometric defects during the rolling of rings. An approach to formalizing the deviation of the ring from roundness is developed based on statistics associated with the difference between the target circumference and the resulting ring contour.
Keywords: rolling of rings; defects; deviation from roundness.

V. V. Ovseets (Togliatti State University, Togliatti)

Optimization of braking scheme blank when drawing large car parts

The article is devoted to the topic of technology for drawing large-sized upper parts of a car using the cold sheet stamping method using drawbeads at the production of JSC АvtoVAZ. To produce a high-quality upper part of a car, it is necessary to ensure the necessary and sufficient tension of the workpiece, which is set by the drawbeads. The drawbeads can be adjusted both parametrically and quantitatively and positionally in the die area, thereby influencing the process of metal shaping, or setting the braking circuit. The main problem lies in the outdated standards of the used drawbeads of the Renаult campaign that left the alliance, which did not fundamentally change as the requirements for the manufacture of new car parts changed. The main goal of this article during the research will be to increase the percentage of material utilization by optimizing the braking scheme of the workpiece based on drawbeads without losing the quality of the resulting part.
Keywords: stamping technology; drawbead; CAE; braking scheme.

A. D. Seleznev (MSUT «STANKIN», Moscow)

Increasing durability when cutting difficult-to-cut materials with a cutter equipped with superhard material

The purpose of this work is to study cutting tools equipped with superhard materials such as cubic boron nitride and polycrystalline diamond to change their tool life when cutting difficult-to-cut materials. The article provides a comparative analysis of the characteristics of traditional materials, such as high-speed steel and tungsten carbide, with modern superhard materials. The main attention is paid to such parameters as hardness, durability, heat resistance and tool life.
Keywords: superhard materials; cutters; wear resistance; cubic boron nitride; polycrystalline diamond.

V. V. Mironenko, Yu. A. Mikheiko (IRNITU, Irkutsk)

Optimization of quality control of aircraft sheet metal parts using Shewhart charts and computer vision technologies

The methods for assessing the stability of aircraft sheet metal parts using Shewhart charts in combination with computer and machine vision are studied. The importance of stability in aviation and the need for reliable methods to prevent accidents are discussed. They analyze the classical approach to Shewhart charts, their advantages and limitations, and propose an automated method using the ShewhArt program, which improves accuracy and efficiency. The article also considers modifications of Shewhart charts with variable boundaries for small production volumes and complex technical objects. In conclusion, the authors emphasize the prospects of using Shewhart charts to improve the quality and efficiency of production, despite their limitations and requirements for personnel qualifications.
Keywords: stability of sheet metal aircraft parts; Shewhart charts; computer vision; machine vision; automation of quality control process; statistical process control; production quality management; statistical methods of quality control.

V. O. Chernyavsky («New Book Center» LLC, Saint Petersburg)

Optimal cutting temperature conditions

A significant share in the processing stage of mechanical engineering production is occupied by mechanical processing. Despite the progress in obtaining parts surfaces without chip removal (pressure, precision casting, welding), cutting processing still accounts for 60–70 % of the total labor intensity of manufacturing machine parts. The increase in the efficiency of cutting processing due to the optimal temperature regime is investigated. The search for optimal temperature conditions for cutting is carried out.
Keywords: cutting temperature regime; parametric processing; cutting modes; cutting energy efficiency.

I. N. Ganiev, U. Sh. Yakubov (V. I. Nikitin Institute of Chemistry of the National Academy of Sciences of Tajikistan, Dushanbe, Republic of Tajikistan); A. G. Safarov, F. Kholmurodov (S. U. Umarov Physical-Technical Institute, Dushanbe, Republic of Tajikistan); S. R. Olimshoeva (Tajik Technical University named after academician M. S. Osimi, Dushanbe, Republic of Tajikistan)

Study of the thermophysical and thermodynamic properties of aluminum alloy Al+2.18Fe alloyed with potassium

The temperature dependence of the specific heat capacity and changes in thermodynamic functions (enthalpy, entropy, Gibbs energy) of the Al+2.18Fe aluminum alloy modified with potassium, intended as a structural material for the needs of certain industries, has been studied. A method was used to measure specific heat capacity in the «cooling» mode. Based on the experimentally found values of the cooling rates of alloy samples and the standard, knowing their masses, polynomials for the temperature dependence of the heat capacity of the alloys and the standard were established, which are described by a four-term equation. Using integrals of heat capacity, models of the temperature dependence of changes in enthalpy, entropy and Gibbs energy are established. It has been established that the value of heat capacity increases with increasing temperature for aluminum alloys Al+2.18Fe with potassium, and decreases with the amount of potassium additives.
Keywords: aluminum alloy; potassium; cooling rate; heat capacity; heat transfer coefficient; enthalpy; entropy; Gibbs energy.