R. R. Dema, A. V. Koldin (Nosov Magnitogorsk State Technical University, Magnitogorsk)

Mathematical modeling of thermal processes in the tool-blank system in the production of hot rolled strip

A physico-mathematical model of heat transfer between a moving strip and work rolls during hot rolling has been developed, which consists of two subtasks: description of the thermal state of the strip during hot rolling and the thermal state of tool-rolls. Based on the physical and mathematical model, programs have been developed for calculating the temperature distribution in the strip and work rolls, as well as an interactive prompter program for determining the required water flow in the roll cooling system. The numerical solution of the developed model for finding the temperature distribution inside the work roll is compared with the experimental data obtained in production. The developed programs have been tested in the conditions of the current production at the 2000 hot rolling mill of MMK PJSC.
Keywords: hot rolling; heat transfer; roll cooling; physical and mathematical model; temperature distribution.

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

The process of heat propagation in the final rod

The article is devoted to the issues of non-stationary heat transfer. The subject of the study is the process of thermal conductivity in the rod. The article considers heat transfer through a rod with a small cross-section. The problem differs from solved similar problems in that the problems were solved for the case of an infinite rod. Here is the case of a finite rod, so it is necessary to take into account the boundary conditions at the end ends of the rod. When finding a solution, the Fourier series decomposition method is used. Also in the work, a special case is considered when the ends of the rod are maintained at constant temperatures.
Keywords: heat transfer; rod; boundary conditions; heat flow; thermal conductivity; Fourier series.

M. S. Denisov, P. A. Chebotarev, K. E. Davydov (Vladimir State University, Vladimir)

Development of technology for the production of blanks of internal combustion engine pistons with a niresist insert for subsequent isothermal stamping

The paper solves the problem of improving the operational properties of pistons of internal combustion engines (internal combustion engines) by producing blanks of internal combustion engine pistons with a niresist insert for subsequent isothermal stamping. At the same time, the main mechanical and structural properties of the resulting blanks are not inferior to deformable, thermally hardened alloys. The process of production of blanks of internal combustion engine pistons with a niresist insert has been developed. An experimental batch of blanks made of AK 12 alloy was made, their structural properties were investigated. Microstructural analysis helped to establish that it was possible to form small equiaxed crystals in the entire volume of the workpiece with a diameter of 156 mm, which became possible due to the comprehensive compression of the liquid metal under pressure. An increase in the temperature of the beginning of crystallization of pure aluminum under the influence of a pressure of 500 MPa has been established and calculated. It has been experimentally established that the relative change in the volume of the melt before the start of crystallization under the influence of pressure can be from 10 to 1 5%. An original research methodology is proposed, which includes the possibility of recording the main parameters of the process, with the possibility of their correction in real time.
Keywords: internal combustion engine piston; niresist insert; pressure; aluminum alloys; crystallization; microstructures; compression; heat sink.

M. S. Yashin, D. V. Kapitanenko (All-Russian scientific research institute of aviation materials, Moscow)

Technological peculiarities of manufacturing of semi-finished products from corrosive steel for elastic sensitive elements

A present study is carried out research of optimiziation of the technological parameters for manufacture of a cold-rolled semi-finished product of corrosion-resistant steel strips for elastic-sensitive elements in the conditions of the All-Russian Institute of Aviation Materials. Optimization of the parameters of the technological cycle of production is carried out by hot deformation, preliminary hot rolling and heat treatment before cold rolling. A strips of the EP815 type alloy are obtained after the final cold rolling. The results of mechanical tests show that the manufactured semi-finished products have the required technical properties.
Keywords: corrosive steel; elastic sensitive elements; deformation.

A. V. Konovalov, S. I. Kanyukov, O. Yu. Muizemnek (The Institute of Engineering Science, RAS (Ural Branch), Ekaterinburg)

The concept of using linear programming for computer-aided design of press forging technology

The concept of computer-aided design of preliminary forging operations using linear programming for forgings of bodies of rotation with an elongated axis is developed. The main forging operation of their manufacturing is broaching. Technological rules for designing preliminary forging operations are grouped in the form of a system of technological constraints. The goal function is formulated and formalized. The nonlinear system of constraints and the nonlinear objective function are reduced to a linear form that allows one to solve the problem using the simplex method. An example of designing preliminary forging operations for a specific forging using the simplex method is given in comparison with the solution obtained by technologists of one of the engineering enterprises of the Russian Federation.
Keywords: computer-aided design; forging technology; preliminary operations; technological limitations; objective function; simplex method.

Yu Daming («Kaidi Magnetic Technology Research Company Co. Anyang», Anyang, China)

The use of digital technologies in mechanical engineering in order to improve work efficiency

This article discusses issues related to the use of digital technologies in the field of mechanical engineering in order to improve the efficiency and effectiveness of work. The analysis of the development of the mechanical engineering industry for the studied period of time, which allowed to identify the decline in production and indicate its main causes. The main types of digital technologies used in the machine-building industry are considered. The application of artificial intelligence in mechanical engineering has been studied. The use of neural networks and the main tasks solved by using them in production are considered. The main types of robots used in mechanical engineering and their main characteristics are studied. Among the popular models, the author noted the FANUC M-2000iA/1200 robot, as well as the KUKA KR QUANTEC PA robot. The author emphasizes the importance of applying an integrated approach to solving the problem of improving the efficiency of work in mechanical engineering, which consists in using digital knowledge, experience, as well as new production technologies. Directions have been developed to improve the efficiency of work in mechanical engineering based on digital technologies.
Keywords: digital technologies; robots; efficiency improvement; purpose; work; mechanical engineering.