KSHP. OMD №9-2025

A. L. Vorontsov, D. A. Lebedeva (Bauman Moscow State Technical University, Moscow)
Investigation of backward-and-forward extrusion of tumblers with a co-bottom part.

Part 26. Experimental verification of theoretical formulas during traditional constrained extrusion with hardening 

The paper considers the cold constrained traditional extrusion of cups with a conical bottom part made of a strengthening material. The paper provides detailed methods for performing specific calculations of the deforming force for various geometric parameters of constrained extrusion. The paper compares the calculated values with the experimental data obtained during the extrusion of the aluminum alloy AD1, demonstrating the high accuracy of the derived calculation formulas.
Keywords: die forging; tumblers with the co-bottom part; backward-and-forward extrusion; stress; deformation.

Yu. A. Tempel, O. A. Tempel, D. A. Sartakova (Tyumen Industrial University, Tyumen)

Methodology for determining optimal machining conditions for cutting tools with wear-resistant coatings

This article examines wear-resistant coatings and optimizes metalworking parameters for coated cutting tools. A developed method for determining wear-resistant coatings for cutting tools to optimize turning conditions is presented. This method utilizes computer technologies and cutting theory to address this problem.
Keywords: wear-resistant coatings; wear; cutting tool; cutting conditions; metalworking; technological process.

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

Determination of temperature stresses in gearing parts

The article is devoted to methods of mathematical modeling of gears and gears in order to determine temperature stresses. It describes the method of mathematical analogy. The mathematical analogy itself is based on the premise of a plane-deformed thermally stressed state. The results obtained can be used to simplify and increase the efficiency of complex, labor-intensive and low-productivity processes of research, design and manufacture of friction system elements.
Keywords: temperature stresses; deformation; modeling; gears; engagement; wear; mathematical modeling.

A. V. Vanyagin (IAP RAS, Nizhny Novgorod); V. I. Erofeev (Mechanical Engineering Research Institute of RAS; Lobachevsky University, Nizhny Novgorod); A. I. Ermolaev (Mechanical Engineering Research Institute of RAS, Nizhny Novgorod); S. N. Okhulkov (Mechanical Engineering Research Institute of RAS; NNSTU, Nizhny Novgorod); A. S. Plekhov (NNSTU; Lobachevsky University, Nizhny Novgorod)

Method for measuring crank hot stamping press force by receiver shaft torque and device for its measurement (part 1)

Analysis of technological equipment failures shows that the largest percentage of breakdowns occurs in crank presses with flywheel drive and reciprocating action. Therefore, the tasks of reliably protecting crank presses from slider force overloads and increasing their operational reliability remain relevant. The aim of this work is to develop a protection system for crank hot forging presses, such as the K-8544 press, with a force of 25 MN, from technological overloads using a special non-contact measuring and safety device. The article proposes an assessment, method, and device for measuring the force of a crank hot forging press mod. K-8544, allowing to assess and measure the current torques of the receiving shaft in a non-contact manner by the beat frequency based on the frequency method of measuring torsional deformation using broadband FM modulation and the finite element method. For this purpose, a phase meter with a broadband sweep frequency generator (SFG), delay line, and mixer is most applicable.
Keywords: crank hot forging press; main shaft and receiving shaft; slider force; technological operations; receiving shaft torque; phase meter with modulator and broadband SFG; delay line; mixer; beat frequency; optoelectronic sensor of the receiving shaft frequency.

V. V. Glebov, A. V. Platonov, M. V. Kangin, V. A. Sharov (Arzamas Polytechnic Institute, branch of the Nizhny Novgorod State Technical University named after R. E. Alekseev, Arzamas); K. A. Shchegletov, I. I. Klokov, E. M. Kangin (Nizhny Novgorod State Technical University, Nizhny Novgorod)

A numerical simulation study of the «fixture-billet» kit during performing a slotting operation on an electric erosion machine (part 3)

The article presents the design of a special device for processing a shaped hole in the workpiece of a body part in an electroerosion treatment machine. Studies of the strength and stability of the «fixture-billet» kit for strength and stability using the «ANSYS» software package have been performed. The dependence of the values of stresses and displacements in the investigated set of «Fixture-billet» on various masses of workpieces was also revealed. The study showes the possibility of using such devices to secure workpieces weighing up to 200 kg in electroerosion treatment machines.
Keywords: electroerosion treatment; numerical modeling; deformations and displacements; billet basing; adaptation.

A. Yu. Omarov (Russian University of Transport (MIIT), Moscow); V. V. Gunidin (Moscow Polytechnic University, Moscow)

Study of conditions for reducing the sintering temperature of dense alumina materials while maintaining their functional properties

Aluminum oxide powders obtained by chemical dispersion of Al-Zn-Mg-Cu aluminum alloy at various alkali concentrations, which differ in fractional composition, have been studied. Differences in the granulometric composition, morphology, and structure of the selected samples are noted. During the experiments, the optimal amount of binder is determined for each type of powder in order to achieve the required viscosity of the slip. The process of manufacturing ceramic products of complex shape without defects is adjusted using hot-slip casting technology, for which the parameters were precisely selected. The conditions for burning the organic bond are also established and the optimal firing temperature is determined. Finally, the characteristics of the finished ceramics have been thoroughly analyzed.
Keywords: aluminum oxide; glycerol; fractional composition; alumina ceramic; installation of hot glycerol casting; properties.

A. M. Klimanova (Tolyatti State University, Tolyatti) 

Evolution of microstructure and properties in the aging process of dispersion-hardening multicomponent brass with phosphorus

This article presents the result of an experiment to create a sample of a brass alloy based on the CuZn13Mn8Al5Si2Fe1Pb brand doped with phosphorus. To achieve the specified properties, phosphorous copper was introduced into the alloy, which significantly changed the structure and characteristics of the material. To assess the effect of aging time on the properties and microstructure of the alloy, a 430 °C regime with an exposure time of 3,5 and 5,5 hours is used. After heat treatment for 3,5 hours, a significant increase in hardness was noted due to the formation of fine dispersed particles that enhance the characteristics of the material. At an exposure time of 5,5 hours, the dissolution of dispersed particles, an increase in the stable α-phase, and as a result, a decrease in hardness were revealed. Experiments on drilling with constant force have shown a high hardness of the alloy, its drilling time is 1,5 times higher than the vintage brass CuZn13Mn8Al5Si2Fe1Pb, which indicates its promising wear-resistant properties.

Keywords: double and multicomponent brass; phosphorus distribution; silicides; phosphorus; compounds with phosphorus; heat-resistant alloy; transformations upon heating; diffusion processes.