Metalloobrabotka № 2 (128)/2022

Metal cutting

Kizhnyaev Yu. I., Nemtsev B. A., Pluzhnikov S. K. Mastering the technology for deep hole drilling diameters 8–20 mm with an internal chip removal tool of specialized and special machines

The designs of special technological equipment for deep drilling of holes with a diameter 8…20 mm with internal chip removal are considered. Typical layouts of technological systems on lathes and deep drilling machines are given, as examples of their application when drilling with the rotation of a work piece or tool.

Keywords: deep holes with a diameter of 8–20 mm, deep drilling, BTA method, technological equipment for deep drilling.

Minin A. O., Trushnikov V. E., Romanov P. I. Influence of the direction of ultrasonic oscillations on the turning process

The article discusses the methods of applying ultrasonic vibrations in turning, such as: the method of ultrasonic action on the cutting tool in the direction of cutting feed; a method of ultrasonic action on a workpiece using an indenter in the radial direction, which contributes to ensuring the quality of manufacturing products, as well as problems that arise during processing. The objectives of this study are to review and analyze the methods of ultrasonic exposure, to synthesize the results of their application and the parameters of the system exposed to the impact, as well as to determine the factors that, as a result of exposure, can reduce the quality of the product or lead to an emergency. In the course of the work, conclusions were drawn about the insufficient elaboration of the applied methods of ultrasonic exposure, and parameters were identified in relation to which, in the development of the mentioned methods, work was not performed to determine the consequences of the use of ultrasonic vibrations. As a result of the work, profilograms of treated surfaces were made using these methods, their analysis was carried out, and simulation modeling of the system stability was performed.

Key words: ultrasonic vibrations, turning, surface quality, cutting, cutting parameters, cutting tool.

Electrophysical and electrochemical processing methods

Sukhov D. I., Raevskih A. N., Bogachev I. A., Rogalev A. M. The research of structure and properties of Co—Cr—Mo alloy obtained by selective laser melting

The microstructure and mechanical properties of Co—Cr—Mo alloy, produced by the method of selective laser melting (SLM), were investigated. The research of as-built structure was carried out as well as the structure research of Co—Cr—Mo superalloy which underwent anneal and HIP, structure features were determined. The differences in structure between annealed and HIPed material were defined. The comparison between mechanical properties of SLM Co—Cr—Mo alloy, EBM Co—Cr—Mo alloy и as-cast Co—Cr—Mo alloy was done. As result the distinctions in ductility were found and explained by different grain size.

Keywords: selective laser sintering, additive manufacturing, corrosion resistant nickel superalloy, microstructure, mechanical properties, hot isostatic pressure, heat treatment.

New materials and technology

Maksimov D. D., Brigadnov I. A., Trushnikov V. E. Magnetic abrasive treatment of complex profile surfaces of aluminum alloy products

In the presented article, the issue of the implementation of magnetic abrasive processing is considered in order to ensure the quality of surfaces of complex shapes of parts made of corrosion-resistant aluminum alloys. The implementation was carried out through theoretical and experimental research. In a theoretical study, the features of processing corrosion-resistant aluminum alloys, existing and possible schemes for magnetic-abrasive processing of surfaces of complex geometric shapes, including a combination of various working movements of the workpiece and pole pieces, are considered. In an experimental study, the dependence of the quality of the processed surface (roughness) on the size of the working gap between the workpiece and the working pole was determined. The results of the research have shown the prospects of using the method of magnetic abrasive treatment for the purpose of technological provision of surface roughness. The data obtained as a result of the experiment indicate a qualitative improvement in the state of surface roughness.

Keywords: magnetic abrasive treatment, complex profile surface, final processing of aluminum alloys.

Zaides S. A., Nguyen Huu Hai. Influence of kinematics of a toroidal roller on the stress-strain state under surface plastic deformation

The article discusses an approach to increasing the stress-strain state of a hardened layer during surface plastic deformation. The technical idea of solving the problem is based on the consideration of the kinematics of a toroidal tool. To prove the effectiveness of the new kinematics of the tool, the finite element method based on the ANSYS computer program and 3D design software were used, which made it possible to build a finite element model and determine the values of temporary, residual stresses and strains in cylindrical parts during PPD with different kinematics of the toroidal roller at. It has been established that the scheme of reverse rotation of a two-radius roller has the greatest effect on the stress-strain state in the deformation zone, and the smallest effect occurs when a single-radius roller rotates in one direction.

Keywords: surface plastic deformation; stress-strain state; temporary and residual stresses; finite element modeling; two-radius roller; reversible rotation, cylindrical part.

Design of technological systems

Alexandrov A. S., Vasilkov D. V., Golikova V. V. Formation of a dynamic model structure based on a set of characteristics of a technological machining system

The purpose of the article is to form the structure of a dynamic model based on a set of characteristics of a technological machining system. In relation to it, a set of indicators (criteria) determining the state of the technological system is considered. They represent a quantitative assessment of the main static and dynamic properties of a technological system, taking into account the possibility of local modification of the characteristics of subsystems. In dynamic terms, the structuring of the technological model is carried out on the basis of the quality indicators of dynamic contours, structure and dynamic quality. As a result, a hierarchy of simple models is formed with the formation of the structure of the dynamic model of the technological system.

Keywords: technological system, mechanical processing, dynamic model, structure, basing, deformation balance, simple model, composite model, Q-factor, dynamic quality.

Mansurova O. K., Brigadnov I. A., Bekenev K. D., Romanov P. I. Improving the quality of the operator training system complex CNC machine.

The development of the intensification of the production of modern mechanical engineering is taking place in the direction of automation of production through the use of modern software tools, the introduction of integrated technologies that contribute to the speed and efficiency in the restructuring of technological processes in the manufacture of new products. Automated machine-building production uses a wide range of equipment with numerical control — machine tools and machining centers, industrial robots, transport and storage systems. Numerical software control systems of equipment allow you to quickly switch to new types of products with the specified quality, reduce the time of pre-production, the duration of the manufacturing cycle of the product with significant savings on the design and manufacture of technological equipment. The operator of software-controlled equipment is the most important link in the modern production process. Due to the growth of automation, specialists in programming, commissioning and control of equipment with numerical control are now required at most factories and manufacturing enterprises.

Keywords: CNC, machine, operator, training.