Metalloobrabotka № 2 (104)/2018

Nikitin A. V., Vasilkov D. V., Kochina Т. B. Thermophysical and power characteristics in the cutting zone when processing high-temperature alloys

In the given methodical sequence definition of thermophysical and power characteristics in a cutting zone is executed. The basis for determining the thermophysical characteristics on the method of sources, developed by Reznikov A. N. with regard to machining. The balance of

temperatures in the cutting zone with calculations applied to heat-resistant alloys. The cutting forces from the front and rear surfaces of the tool are determined.

Keywords: cutting, thermal characteristics, power characteristics, method, sources, temperature, balance the temperature, cutting forces.

Maslenikov I. A. Shaping of chips outside the contact zone during the machining of plastic materials by a blade tool

The results of the research of the stress state in the cutting zone of ductile materials. Determination of the stress distribution in the workpiece, deformation of the material, zones of contact and temperature, form and size of cutting chips. The research was carried out using the theory of elasticity and theory of plasticity.

Keywords: cutting process , stresses in the material, the cutting chips.

Vereshchagin V. Yu., Mokritsky B. Ya., Vereshchagina

S. Methodology of selecting effective covering based on modeling of stresses in cutting tools

The process of cutting with a tool coated on it is considered. Investigations of the stressed state of the cutting tool with coatings during the cutting process are carried out. The interaction of the cutting force with the stresses arising in the cutting tool is shown. The efficiency of the cutting tool with coatings was evaluated.

Keywords: cutting tools, the cutting process, a period of wait-bones, multilayer coatings, stresses, modeling.

Pereverzev P. P., Alsigar M. K. Modern methods of mathematical modeling of metal removal process and basic cutting mode elements when grinding with longitudinal feed

The purpose of work to improve the efficiency of the round external grinding with longitudinal feeding by choosing organization as a rational structure and working cycle parameters, taking into account the grinding mode accompanying the machining process on CNC machines for a given automatic step-cycle grinding. The actuality of modeling the process of metal removal in automatic

cycles of round external grinding with longitudinal feed, performed on CNC machines, is caused by the absence of automated design systems and normative reference literature and cycle design techniques that meet the requirements of modern automated production, has led to that. in this article the technique of calculating the actual feeds and cutting forces for a given cycle and grinding conditions.

Keywords: longitudinal feed, cutting modes, grinding cycle, modeling, cutting force, round external grinding

Ogorodov V. A. The calculation of the radial cutting forces when honing thin-walled cylinders

The method of calculation of radial forces of cutting at honing speed thin-walled cylinders subject to the compliance of the contact layer "honing whetstone-detail". The calculation of the deformation of thin-walled cylinder applied sweep method, for which analytical dependences of the allocation of integral functions in the sections of change of the radius of the middle surface of the cylinder. The proposed algorithm of calculation of thin-walled cylinder with an arbitrary number of stages and arbitrary load.

Keywords: honing, step thin-walled cylinder, radial cutting forces, contact "honing bar- detail", contact give, deformation, calculation method, calculation algorithm, adequacy of the model.

Maksarov V. V., Keksin A. I. Technological support of thread surfaces roughness by means of tool preprocessing by magnetic abrasive finishing

In the presented article the question of technological support of thread surfaces roughness is considered. Thread tap is selected as a tool for manufacturing threads. Con tact surfaces of the teeth of the thread tool have been preprocessed by magnetic abrasive finishing. As a result of the

carried out researches on technological support of roughness of threaded surfaces it was established the influence of the state of the contact surfaces of the teeth, formed by the method of magnetic abrasive finishing, on the roughness of the lateral sides of the internal threaded profile.

Keywords: technological support of roughness, roughness, internal thread, threading, thread surfaces, thread tap, magnetic abrasive finishing, rounded radius cutting edges.

Vedernikov Yu. A., Khisamutdinov R. M., Khusnullin A. R., Ponomareva V. D. Modernization of the gear hobbing machine for manufacturing a globoid worm

Modernization of the gear hobbing machine allows to produce a globoid worm without using an expensive tool. The billet under the globoid worm is installed between the collet and the earring. To cut the helical groove, the incisor head is used. There are 4 incisors in the incisor head. The incisors on the special device are exposed along the diameter D_e of the hollows of the globoid worm. The incisor head is mounted on a special mandrel to be installed on the working table. The design of the mandrel should have a mechanism allowing the cutting of the incisors in the height of the center of the axis of the spindle. The incisors are sharpened with the same value of X. By moving the sliding support, the workpiece is positioned relative to the center of the mandrel. The machine is configured as a worm wheel. When the next cutter comes out of contact with the workpiece before the entrance of the next cutter, the cutter's time passes through the angle γ. During this time, the cutter head is fed to the workpiece to remove the next allowance. As a periodic feed mechanism, a stepper motor with a hydraulic booster is used instead of the feed motor. The activation command is carried out from the sensor D, located on the table body and the cam K, fixed on the turntable fixed in synchronism with the cutter exit from the cutting zone.

Key words: globoid worm, hobbing machine, milling, carriage spindle, incisive head, periodic feed, stepper motor, sliding bearing.

Razhikov V. N., Belyaev A. N. Development of spacecraft antenna positioning system

The paper covers the key engineering challenges of designing a KHV planetary gear used to position a spacecraft antenna. The major benefits of such gear over harmonic gear drives, and of the involute profile are shown.

Keywords: KHV planetary gear, antenna positioning system, spacecraft.

Nikiforov V. I., Radkevich M. М. Сlassification of technological processing methods in science and study

Аnalysis of the classifications of technological processing methods presented in the scientific and educational literature and concluded that the absence of scientific classification. Reviewed by physico-chemical processes when handling workpieces, occurring in the technological system and classification of technological methods of machining, named scientific classification. Set the relationship between academic knowledge and approaches to transformation of scientific classification in classification. Suggestions for research on technological methods of machining areas for students and professions in the field of engineering and technology in the academic discipline of "technology of structural materials.

Keywords: classification, technological processing method, process system, physical and chemical processes, classification, structure, science, learning process, discipline, technology of construction materials.