Vibrations in engineering and technology最新文献

{"title":"MATHEMATICAL MODEL OF THE MOVEMENT OF PARTICLES IN A CYLINDRICAL VIBRATING MIXER CONTAINERS","authors":"Polievoda Yurii, Volynets Yevhenii, Bystrytskiy Oleksandr","doi":"10.37128/2306-8744-2022-4-3","DOIUrl":"https://doi.org/10.37128/2306-8744-2022-4-3","url":null,"abstract":"Mixing is the process of bringing different masses of products into close interaction by increasing the contact area in order to obtain the product of the required consistency, to maintain the latter or to evenly distribute impurities in the main volume of products.\u0000\u0000The process of mixing components with different physical and mechanical properties is realized mainly by creating shear deformations in the entire mass of the product with the help of blades, rotating screws, or other working bodies. At the same time, in order to ensure a uniform distribution of the components, it is necessary to give the particles of the dispersed mass such trajectories that would ensure the greatest probability of their crossing. But the movement of these particles in the volume of the mixture is opposed by the forces of inertia and the forces of dry internal friction (friction of particles against each other) and forces of dry external friction (friction of material particles against the container, blades or other working organs of the mixer), which, as a rule, are on the order of lower than the forces of dry internal friction. In addition, when mixing, it is necessary to overcome the forces of gravity, which try to lower the particles of the material to the bottom, which leads to their delamination.\u0000\u0000Numerical modeling has been increasingly used in the description of mixing processes of loose materials in recent decades. Numerical modeling is especially convenient when describing the processes of gravity-overflow mixing, when it occurs most actively in a thin layer of material, in which there is a random transition of component particles to the adjacent layer.\u0000\u0000The article examines the modeling of the movement of particles during the rotating movement of the cylindrical mixer chamber without the use of blade intensifiers and the effect of vibration on the product.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115229711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"JUSTIFICATION OF EXTRUDER PARAMETERS WITH FLEXIBLE SCREW ELEMENT","authors":"Kondratyuk Dmytro, Dmitrenko Victor","doi":"10.37128/2306-8744-2022-4-2","DOIUrl":"https://doi.org/10.37128/2306-8744-2022-4-2","url":null,"abstract":"For dry grain extrusion, autogenous single-screw extruders are mostly used, in which more than 85% of the supplied energy is spent on overcoming frictional forces. This leads to heating of the body and screw of the extruder and uneven wear along their length. The greatest wear is observed in the zone of maximum pressure and temperature.\u0000\u0000The wear of the screw causes a decrease in the productivity of the extruder and a deterioration in the quality of the extrudate. In addition, in case of wear of the ridges, it is necessary to change the screw, that is, the costs associated with the repair and maintenance of the extruder increase.\u0000\u0000In order to increase productivity and reduce maintenance costs, a sectional design of the working part of the extruder is proposed, the characteristic feature of the screw of which is that grooves are cut on the outer surface of the section along the helical line, into which spring segments are inserted. The sections of the screw are installed close together, and their grooves form a continuous screw line. Moreover, the width of the grooves allows the springs, as a result of periodic pressure changes in the pre-matrix zone of the extruder, to move along the axis of the screw.\u0000\u0000Determination of rational parameters and modes of operation of the extruder with an elastic screw element was carried out using the method of planning multifactorial experiments. The specific performance of the extruder was chosen as the optimization criterion.\u0000\u0000It was found that with the diameter of the extruder screw 50 mm, the temperature of the extrusion process 142...145 0С, the moisture content of the grain mixture 18.0...18.6% and the diameter of the die 5.5 mm, the following values of the factors are rational from the point of view of the maximum specific productivity of the extruder: screw rotation frequency 330...480 rpm; the depth of the screw channel is 5.3...7.1 mm; screw pitch 20...21mm; the number of grooves cut on the inner surface of the extruder body is 7...9 pieces.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"190 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116214991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TYPES AND CONSTRUCTIONS OF VIBRATION EXCITERS OF MODERN ENGINEERING","authors":"Paladiychuk Yuriy, Telyatnuk Inna","doi":"10.37128/2306-8744-2022-4-4","DOIUrl":"https://doi.org/10.37128/2306-8744-2022-4-4","url":null,"abstract":"One of the ways to increase the fatigue strength and wear resistance of parts is defamation of the surface layer of the working surfaces of the parts as a whole and in stress concentration zones. Plastic deformation takes place when the load increases, which is higher than the elastic strength of the material, as the metal strengthens during the deformation process. The bulk of industrial alloys have a polycrystalline structure. During the deformation of polycrystals, there is no sliding stage, the deformation of the grains begins immediately along several sliding systems and is accompanied by bending and twisting of the sliding planes. The total deformation is small and amounts to 1%, the grains are deformed heterogeneously due to their different orientation in relation to the applied loads. As the deformation changes, the difference between the grains of the material decreases and the microstructure changes: the metal grains are gradually pulled out in the direction of the plastic flow, which leads to a change in the grains of the crystal lattice of the metal with an increase in the density of defects.\u0000\u0000The reliability of machine parts primarily depends on their strength, wear resistance, vibration resistance, heat resistance, etc. These criteria for the reliability of machine parts are provided by various methods and measures during their manufacture, such as: material selection and various methods of increasing strength and wear resistance - heat treatment, treatment by various physical methods of the surface of the part and areas of stress concentration, etc.\u0000\u0000The introduction of modern methods and tools in the development of mechanical engineering ensures an increase in the reliability of parts and products in general, as well as a reduction in the cost of production.\u0000\u0000This article analyzes the types and designs of known vibration equipment and vibration exciters used in mechanical engineering. The structural diagram of vibration equipment production is considered.\u0000\u0000Determination of the main advantages and disadvantages of vibration equipment and vibration exciters.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116400806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TESTING AND DIAGNOSTIC COMPLEX FOR GREENHOUSE EQUIPMENT","authors":"Veselovska Natalia, Romanov Vitaliy","doi":"10.37128/2306-8744-2022-4-5","DOIUrl":"https://doi.org/10.37128/2306-8744-2022-4-5","url":null,"abstract":"Designing of technological processes of volume stamping at the modern level involves solving a number of complex problems. The main purpose of the article is to use the laws of the deformation process to model the kinematics of plastic flow using modern software systems based on the finite element method. The obtained data will allow to form an information field of a specific technology and, thus, to be able to control both the process and the properties of products.\u0000\u0000These tasks include: determining the degree of deformation in the volume of the body and predicting the technological heredity of products; optimization of stamping transitions and prevention of technological failures.\u0000\u0000As a result of plastic deformation, especially cold, the material inherits uneven hardening and heterogeneity of properties in the volume of stamped products, which are the cause of residual stresses. Residual stresses can increase or decrease the strength of the product if it is not subjected to heat treatment after cold plastic deformation. The heterogeneity of the properties is due primarily to the uneven distribution of the accumulated deformation, the calculation of which in conventional technological practice is complicated.\u0000\u0000After pressure treatment, parts or workpieces are often annealed to relieve internal stresses and improve the structure of the metal. When designing technological processes with the use of computer modeling programs for plastic deformation processes, it is possible to choose such modes of deformation, which excludes the area of deformation that causes technological failures.\u0000\u0000In the processes of cold three-dimensional stamping, the possibilities of plastic deformation of metals are limited. Very often the deformations required to obtain products of the desired shape exceed the plasticity of the material - the degree of deformation at which a crack is formed under the conditions of this mechanical scheme of deformation. Therefore, it is necessary at the design stage of technological processes to establish whether the material will withstand the projected operation, which will lead to intensification of metalworking processes by pressure, as well as significant savings associated with reducing production experiments to adjust the process.\u0000\u0000Modern theory of plasticity allows to formulate and solve all these problems, however, given their complexity and connectivity, the result can be achieved only by using direct numerical methods, which in combination with high-speed computer equipment have created the preconditions for mathematical models of metalworking pressure and led to the emergence of appropriate programs, based in most cases on the finite element method.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126422661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ALLOYING ELEMENTS EFFECTS ON ELECTRICAL CONDUCTIVITY AND MECHANICAL PROPERTIES OF NEWLY FABRICATED AL BASED ALLOYS PRODUCED BY CONVENTIONAL CASTING PROCESS","authors":"Veselovska Nataliia, Bohatiuk Maksym","doi":"10.37128/2306-8744-2022-3-7","DOIUrl":"https://doi.org/10.37128/2306-8744-2022-3-7","url":null,"abstract":"The present investigation deals with a comprehensive study on the production of aluminum based alloys with the incorporation of different alloying elements and their effect on its electrical conductivity and mechanical properties. Casting of pure aluminum with different concentration and combinations of alloying additives such as cupper (Cu), magnesium (Mg) and silver (Ag) were carried out using a graphite crucible. The as-cast microstructure was modified by hot rolling followed by different heat-treated conditions viz., annealing, normalizing, quenching, and age hardening. The mechanical properties and electrical conductivity of the produced heat-treated alloys sheets under various processing conditions were carried out using tensile testing, hardness, and electrical resistivity measurements. It was found that by increasing the alloying elements content, yield strength results increased significantly by more than 250% and 500% for the as rolled and 8 h aged Al-Cu-Mg alloy, respectively. On the other hand, the electrical conductivity reduces slightly with −14.6% and −16.57% for the as rolled and 8 h aged of the same Al-Cu-Mg alloy, respectively.\u0000\u0000From the last four decades, due to the increase in demand from the electricity transmission lines, copper is being replaced by Al because of its light weight and relatively low cost. In addition, among the engineering conductor materials, aluminum has a very good electrical conductivity due to lower specific gravity (almost in the second rank after copper). The replacing of copper by aluminum for electricity transmission by overhead ACSR (aluminum conductor steel-reinforced) conductors, power cables, etc. has increased all over the world. Moreover, substitution of copper by aluminum also takes place in countries which have enough resources from copper, since it shows a good economical advantage as serious competitor against copper.\u0000\u0000Practically, by adding alloying elements to pure aluminum, aluminum’s strength can be significantly improved. However, on the other hand a great reduction in the electrical conductivity takes place due to the solute atoms and impurities generated by substitution of alloying elements. Another process affecting the electrical conductivity of aluminum is the heat treatment process, since elements in the solid solution phase represent a higher resistance than non-dissolved elements. That is why it is a great challenge to play with the strength of the pure aluminum in such a way that the decrease in its electrical conductivity will be still acceptable and valid for the selected application.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130594531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INVESTIGATION OF THE PROCESS OF DRYING SEEDS OF HERBS","authors":"Solona Olena, Zamrii Mykhailo","doi":"10.37128/2306-8744-2022-3-11","DOIUrl":"https://doi.org/10.37128/2306-8744-2022-3-11","url":null,"abstract":"The modern unsatisfactory state of livestock in Ukraine depends largely on the lack of high -use feed, especially on legumes. In turn, the lack of such feed is associated with insufficient amounts of high -yielding seeds. All studies aimed at increasing the production of herbs are relevant and require a priority solution.\u0000\u0000The deficiency of high -performance seeds of legumes is explained by several reasons. These are the agrotechnical and physical and mechanical properties of both the seeds and the components of the crop mixture, the weather conditions under which is harvested, etc. To a large extent, the amount and quality of seeds depends on the conditions and results of harvesting the seeds.\u0000\u0000In this regard, the development of new means for drying the crop mixture of herbs and the study of the impact of their structural and technological parameters to improve the energy and qualitative indicators of the technological process of work of drying equipment is an important task.\u0000\u0000Analysis of the technologies of collection of legumes of legumes shows that almost all methods of harvesting require additional treatment of crop mass on the hospital. It is thanks to bringing the crop mixture to the corresponding condition, especially by its humidity, that it is possible to significantly reduce the field loss of seed crop.\u0000\u0000Analysis of agricultural dryers in terms of suitability for drying the crop mixture was carried out. For the implementation of the process of drying of this material, the most suitable are dryers with a fixed layer. After all, the use of most types of dryers is impossible due to the specific features of the material.\u0000\u0000The scheme of the laboratory installation for the experimental determination of structural and mode parameters of the drying process is proposed. The laboratory installation allows you to adequately simulate the process of drying the thick layer of crop mixture with the possibility of reversible supply of the drying agent.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"589 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115980568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MATHEMATICAL MODELING OF THE HYDRAULIC DRIVE TRANSFER OF A EXTENSIVE AGRICULTURAL UNIT FROM TRANSPORTATION TO WORKING POSITION","authors":"Shargorodskiy Serhiy, Rutkevych Volodymyr, Yashchuk Evgen","doi":"10.37128/2306-8744-2022-3-8","DOIUrl":"https://doi.org/10.37128/2306-8744-2022-3-8","url":null,"abstract":"This article highlights the solution to the problem of building a dynamic mathematical model and its research. The analysis of the processes taking place in the hydraulic drive of the transfer of the wide-grip agricultural unit from the transport position to the working position was performed. Search and analysis of already existing hydraulic systems, principles of building mathematical models and methods of their solution were carried out. It is shown that one of the directions of development of the market of modern agricultural aggregates is an increase in the number of structures with an increased width of grip. It should be noted that this design feature has several advantages from the point of view of fuel economy, reduction of the number of passes of the unit and, as a result, reduction of the amount of compacted soil. Which, in turn, contributes to the preservation of its condition and increases the efficiency of its use. The disadvantage of wide-grip units is the difficulty of maneuvering when turning. Therefore, to ensure quick maneuvering, units of this type must be equipped with an effective system for transferring the machine from the transport position to the working position. A hydraulic drive is used to meet this requirement. This type of drive has a number of advantages - compactness, power, the ability to work at high speeds and the ability to dampen vibrations. The scheme of the hydraulic drive for transferring the wide-grip unit from the transport position to the working position with gradual switching on of the hydraulic motors is proposed. A mathematical model of the hydraulic drive has been developed. The composition of the proposed mathematical model includes the balance equations of the amount of liquid, the equations of forces and moments acting on the working bodies of hydraulic motors. The obtained solutions of this system make it possible to conduct a thorough analysis of the processes taking place in the hydraulic drive, and to identify such ratios of hydraulic drive parameters that ensure high-quality operation of the system.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115084495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling the process of grain separation by density in a combined vibro-pneumatic and air-gravity unit","authors":"Kotov Boris, Stepanenko Serhii, Grushetskyi Serhiy, Hryshchenko Volodymyr","doi":"10.37128/2306-8744-2022-3-3","DOIUrl":"https://doi.org/10.37128/2306-8744-2022-3-3","url":null,"abstract":"It was established that the method of intensifying the course of the work process is the organization of supplying the layer with a pulsating flow of air. Using a pulsating air flow, it is possible to change the magnitude of the aerodynamic effect on the grain mass by changing the magnitude of the force pulse under conditions of constant speed. At the same time, the effect of the pulsating flow on the ability to move grains of different mass (density) will be different, which can intensify the separation of seeds by density. The study of the combined effect of vibrations and pulsating air flow on the stratification of the grain flow and separation by density is an important scientific and technical task.\u0000\u0000The conducted analysis of publications revealed a promising possibility of using serial vibrating screen machines with a pneumatic system for the preparation of combined machines with a pneumatic system for the preparation of high-quality seeds, instead of vibro-pneumatic tables. To study the efficiency of the combined use of vibropneumoliquefied and pneumogravitational movement of the material.\u0000\u0000It is substantiated that the intensifying effect of the pulsating flow consists in the different force of influence on light and heavy grains. The mathematical description of the process of separation of loose material by density is based on the equations of motion of a particle in an oscillating medium, which is valid for any continuous medium that has the property of inertness.\u0000\u0000Formulated mathematical models of the processes of movement of components of grain material in the vibro-liquefied layer and in the air channel of the vibro-pneumocleaning machine will allow to determine the trajectories of the movement of grains in the working zones and, based on their analysis, to justify the parameters of the working bodies.\u0000\u0000The approbation of the mathematical description of the processes of separation of the components of grain material confirmed the increase in the efficiency of the use of pulsating flows for the separation of grain by density.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127412209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RESEARCH AND MODERNIZATION OF A GAS DYNAMIC SPRAYING DEVICE FOR THE CREATION OF POLYMER FUNCTIONAL COATINGS","authors":"Gaidamak Oleg, K. Yulia","doi":"10.37128/2306-8744-2022-3-9","DOIUrl":"https://doi.org/10.37128/2306-8744-2022-3-9","url":null,"abstract":"The article analyzes various methods of creating polymer coatings. The following methods of application of polymer powder materials, namely in a pseudo-liquid state, electrostatic, thermojet, gas flame, have become the most widespread in production. Each of the listed methods has its own features and advantages and disadvantages, which determine the scope of their use based on the parameters of the objects to be coated, their structures and features, conditions of future operation, as well as the required thickness of the polymer coating layer. The only factor that unites all methods is the thermal effect in the process of creating a polymer coating, which is necessary for the formation of a strong adhesive bond between the coating and the substrate. The article shows the results of research into the possibility of using a device for gas-dynamic application of metal coatings to create polymer coatings, and its modernization in order to eliminate the identified shortcomings and achieve optimal conditions for the formation of polymer functional coatings. The possibility of a high-speed coating application regime and its influence on the formation of the coating were analyzed. The structure of the researched gas-dynamic device for applying coatings is shown, which contains an electronic heater for the flow of compressed air, and a nozzle assembly for accelerating the heated compressed air in which, due to the ejection effect, the molten polymer material is sucked in and accelerated, which can be in the form of a finely dispersed powder or in the form of a solid dart in the hottest zone with a temperature of about 350 ºС, which contributes to its rapid melting to a liquid state, at the same time, reducing the length of the nozzle to 40 mm allows maintaining the temperature of the polymer material at the level of 230 ºС, which allows the formation of a high-quality coating, while the air pressure is reduced from 0.5 MPa to 0.02 MPa. The conducted studies showed that the use of gas-dynamic sputtering makes it possible to significantly simplify the control and regulation of the heating temperature of polymer materials compared to gas-flame sputtering, due to the possibility of adjusting the temperature of the air flow by changing the current strength on the heating element. Compared to the technology of creating polymer coatings using powder paints, there are also significant advantages associated with the fact that there is no need for long-term heating of these coatings in thermal polymerization chambers. In addition, it is possible to apply polymer coatings on the surface of large-sized products that are not limited by the size of thermal chambers.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133506453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INFLUENCE OF GEOMETRIC CHARACTERISTICS OF GAS BEARINGS ON THE DURABILITY OF HIGH-SPEED SPINDLE ASSEMBLIES.","authors":"Vishtak Inna","doi":"10.37128/2306-8744-2022-4-10","DOIUrl":"https://doi.org/10.37128/2306-8744-2022-4-10","url":null,"abstract":"The processing accuracy and productivity of metal-cutting machines are largely determined by the initial characteristics of the spindle assembly, since it is the last link in the kinematic chain of the main drive. Therefore, high demands are placed on spindle assemblies to ensure high rotational accuracy, high speed, parametric reliability, etc. Since the movement of shaping is carried out by the spindle and spindle bearings, they make a decisive contribution to the initial characteristics of the spindle units.\u0000\u0000The installation of spindles on gas bearings makes it possible to significantly increase the accuracy of rotation and speed of the spindle, almost completely eliminate its vibration, simplify the design and significantly increase the parametric reliability of the spindle assembly. The parameters of the gas lubricating layer in the conical bearings of the spindle are investigated and the equation of gas pressure in the gaps of the gas conical bearing with grooves of different profiles applied to the bearing shaft of the spindle is derived. The optimal geometric parameters of the profile of longitudinal blind grooves applied to the working surfaces of the spindle shaft are determined. Investigations were carried out using numerical methods using modern software.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124656466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}