Surface Treatment Of Parts Research Articles

SEWING MACHINE MALFUNCTIONS AND THEIR ELIMINATION

The working principles of the sewing machine technology and sewing forms defined during the past centuries have been able to maintain their relevance to the present day, and in general, no serious innovation has been made in the constructive parameters. In addition, in recent times, significant progress has been made in the technology of further improving the sewing machine. The introduction of new materials and the role of modern electronic systems in the emergence of these advances is undeniable. Currently, manufacturers are trying to apply new combinations of design elements, taking into account modern requirements, to increase the efficiency of sewing machines to be put into operation. The presented article includes a study of the malfunctions of sewing machines, including modern design combinations, due to the disruption of the interaction of working parts, wear of parts, and changes in the surface treatment of parts. Keywords: sewing machine, mechanism, needle, shuttle, upper thread, lower thread, bobbin cover.

RESEARCH OF THE VIBRATORY FORMATION OF THE COMPASSION OF POWDER MATERIALS BY HYDRO-IMPULSE LOADING

Modern trends in the field of mechanical engineering require constant improvement of production through the introduction of new methods and means aimed at increasing the reliability of parts and the overall quality of products, while reducing the costs of their production. The reliability of machine parts is determined by various factors, such as strength, resistance to wear, vibration and high temperatures. In order to achieve these reliability criteria, various methods are widely used, such as material selection and the use of technologies aimed at increasing strength and wear resistance, such as heat treatment, surface treatment of parts by various physical methods, and stress reduction. One of the methods of increasing the fatigue strength and wear resistance of parts includes the use of surface plating on the working surfaces of parts in general and in areas of stress concentration in particular. The mentioned article carefully analyzes the process of forming metal powders, considering it as a technological operation that leads to the creation of powder forms. A detailed analysis and comparison of the equipment used for vibropress molding of blanks from powder materials is also carried out. The article describes the main technological processes of vibration and shock impact on materials. In addition, the article offers schemes and methods of implementation of vibration molding of powder materials, as well as analysis and classification of these processes according to their characteristics of vibration and vibration-impact modes. This allows you to understand the effectiveness of various methods and their applicability in specific production conditions, contributing to the further development and improvement of modern technologies in mechanical engineering.

Features of Increasing the Wear Resistance of Machine Parts by Treatment with a Concentrated Heat Flow

The article discusses the possibility of using surface treatment of parts with a concentrated heat flow to increase the wear resistance of parts. This method provides conditions for the rapid crystallization of the metal structure after zonal surface melting of the sample surface with electric arc plasma. It has been found that the wear resistance of steel increases significantly with increasing scanning speed and decreasing current strength. The near-surface layers on the cross-sectional grinds of the melting areas were studied in comparison with the initial (without melting) state on the basis of diagrams of the method of continuous indenter immersion. The values of a number of micromechanical parameters characterizing the resistance to microplastic deformation and elastic-viscous properties of steel after strengthening heat treatment were obtained. It should be noted that with a fourfold increase in hardness, the wear resistance of the steel increased almost 10 times. This indicates that the wear resistance of metals under friction is determined not only by macroscopic strength and hardness, but also by the ability to relax local peak stresses under dynamic contact interaction

Application of an integrated method to improve the quality of manufacturing parts of electronic warfare devices

Objectives. The development of technological methods with the purpose of increasing the structural strength of defense engineering products can be carried out by creating new methods for obtaining and processing parts or improving traditional methods based on an integrated (synergistic) approach. The article presents a complex method for surface treatment of parts and assessment of the hardness and surface roughness of the initial workpiece from alloys of the Al–Mg system to improve the quality of manufacturing the module cases of the MSP-418K product related to electronic warfare devices.Methods. This approach consists in the vision of a metallic material as a system subjected to a chain of technological impacts in the process of chemical, thermodynamic, and mechanical interaction of its components. The workpieces were obtained by metal pressure treatment according to various schemes and temperature conditions Then they were processed with a blade tool using a dynamometer. The resulting cut was examined using a metallographic method along the entire end face from the outer surface to the center of the sample of workpieces.Results. Experiments were carried out for the case of Al–Mg alloys. It made it possible to reveal the relationship between the parameters of the change in the structure of the material being processed and the stability of the cutting process, as well as the quality of the surface during finishing turning.Conclusions. The proposed technological solutions based on a synergistic approach provided a balanced improvement in material parameters by eliminating the shortcomings of the original semi-finished product. The obtained experimental data allowed concluding the deformation of workpieces according to complex schemes at low temperature has a beneficial effect on the machinability of the metal material, ordering the structure and improving the quality of the surface of the parts. Using a synergistic approach, it became possible to correct the poor technological heredity of material properties obtained in previous operations: the surface quality of the workpieces due to the continuity of the processed material and the strength properties of parts for critical and especially critical purposes were improved. The existing technological process for manufacturing the “petal” part was changed in practice using an integrated method, which made it possible to improve its technological and technical characteristics.

Operation of diesel engine with fuels treated with nanoparticle additives

Treatment of materials with nano-sized elements is widely used in the automotive industry. This application is associated both with surface treatment of parts and in the form of various mixtures. The use of nanoparticles as an additive to oils and fuels aims to impact the energy efficiency of the engine in order to improve mechanical losses and its environmental performance. Improving mechanical losses leads to a reduction in energy consumption and hence to a reduction in carbon emissions. Published research in this regard has shown an impact on various physical processes related to engine performance. In this paper are shown the results from performed studies on a direct injected diesel engine when working with oil and fuel additives, based on carbon nanoparticles. The results show an improvement in the operation of the fuel injection system and reduction in the mechanical losses in the engine.

Surface treatment of parts in aircraft engineering

The effectiveness of using jet-abrasive machining of aircraft engine parts is shown. The results of this treatment are shown in order to prepare surfaces for coating application and repair. Keywords: surface, jet-abrasive machining, abrasive, roughness, motor blade, coating. psn50@mail.ru