Metal-cutting technological equipment

2018 ◽  
Author(s):  
Людмила Вереина ◽  
Lyudmila Vyeryeina ◽  
Александр Ягопольский ◽  
Aleksandr Yagopol'skiy
Keyword(s):  
Professional Education ◽  
Machine Tools ◽  
Metal Cutting ◽  
General Information ◽  
Numerical Control ◽  
Machine Systems ◽  
Automatic Tool ◽  
Design Calculations ◽  
Higher Professional Education

General information about Metalworking machines, automatic lines, robotic technological complexes is presented. Classification of machine tools, their model parts and assemblies (including mechatronics), design calculations. Devices and kinematic schemes of machines with manual control and numerical control (CNC) are considered. Multi-purpose machines, automatic tool changers and operators are described. The basic information about the operation of machines and machine systems.. For students of higher professional education.

Dynamics of the processes in metal machining

1998 ◽  
Vol 2 ◽  
pp. 115-122
Author(s):  
Donatas Švitra ◽  
Jolanta Janutėnienė
Keyword(s):  
High Frequency ◽  
Machine Tools ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Low Frequency ◽  
Metal Cutting Machine ◽  
Cutting Machine ◽  
Metal Machining

In the practice of processing of metals by cutting it is necessary to overcome the vibration of the cutting tool, the processed detail and units of the machine tool. These vibrations in many cases are an obstacle to increase the productivity and quality of treatment of details on metal-cutting machine tools. Vibration at cutting of metals is a very diverse phenomenon due to both it’s nature and the form of oscillatory motion. The most general classification of vibrations at cutting is a division them into forced vibration and autovibrations. The most difficult to remove and poorly investigated are the autovibrations, i.e. vibrations arising at the absence of external periodic forces. The autovibrations, stipulated by the process of cutting on metalcutting machine are of two types: the low-frequency autovibrations and high-frequency autovibrations. When the low-frequency autovibration there appear, the cutting process ought to be terminated and the cause of the vibrations eliminated. Otherwise, there is a danger of a break of both machine and tool. In the case of high-frequency vibration the machine operates apparently quiently, but the processed surface feature small-sized roughness. The frequency of autovibrations can reach 5000 Hz and more.

Regulation of an ovulatory cycle

1998 ◽  
Vol 2 ◽  
pp. 107-114 ◽  
Author(s):  
D. Švitra ◽  
R. Grigolienė ◽  
A. Puidokaitė
Keyword(s):  
High Frequency ◽  
Machine Tools ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Low Frequency ◽  
Metal Cutting Machine ◽  
Ovulatory Cycle ◽  
Cutting Machine

In the practice of processing of metals by cutting it is necessary to overcome the vibration of the cutting tool, the processed detail and units of the machine tool. These vibrations in many cases are an obstacle to increase the productivity and quality of treatment of details on metal-cutting machine tools. Vibration at cutting of metals is a very diverse phenomenon due to both it’s nature and the form of oscillatory motion. The most general classification of vibrations at cutting is a division them into forced vibration and autovibrations. The most difficult to remove and poorly investigated are the autovibrations, i.e. vibrations arising at the absence of external periodic forces. The autovibrations, stipulated by the process of cutting on metalcutting machine are of two types: the low-frequency autovibrations and high-frequency autovibrations. When the low-frequency autovibration there appear, the cutting process ought to be terminated and the cause of the vibrations eliminated. Otherwise, there is a danger of a break of both machine and tool. In the case of high-frequency vibration the machine operates apparently quiently, but the processed surface feature small-sized roughness. The frequency of autovibrations can reach 5000 Hz and more.

COMPUTER MODELING OF FINANCIAL CALCULATIONS

2019 ◽  
pp. 33-37
Author(s):  
O. S. Korneva
Keyword(s):  
Computer Modeling ◽  
Professional Education ◽  
Information Technologies ◽  
Financial Education ◽  
Economic Education ◽  
Economic Activities ◽  
School Teachers ◽  
University Teachers ◽  
Educational Literature ◽  
Higher Professional Education

Within the implementation of the national strategy for improving financial competency and financial education in Russia, aimed at the broad masses of the population, any experience in promoting financial competency among young people, accumulated in the system of training bachelors of Economics, will be useful. The purpose of the article is to present the methodological and practical aspects of teaching the basics of financial calculations of future economists and the formation of computer modeling skills in the field of financial and economic activity. The reason for writing the article was the problem of interdisciplinary integration in the system of financial and economic education. The analysis of educational literature and curricula of the system of secondary and higher professional education, as well as the study and generalization of pedagogical experience showed weak integration of mathematical and economic disciplines with information technologies. The article also presents the problems associated with the calculations in the financial and economic activities with the use of computer modeling. The elements of the presented methods of teaching the basics of financial computing in conjunction with the modeling of financial problems on the computer can be useful for both school teachers and university teachers of mathematics and computer science.

Viktor P. Denisenkov (to the 75th anniversary of his birthday)

2013 ◽  
pp. 137-141 ◽  
Author(s):  
D. A. Philippov ◽  
O. V. Galanina
Keyword(s):  
Professional Education ◽  
Associate Professor ◽  
75Th Anniversary ◽  
Higher Professional Education

June 12, 2012 marks 75 years since the birth of the Leningrad (St. Petersburg) bolotoved, tortued, botanical geographer, honorary worker of higher professional education of Russia, candidate of geographical sciences, associate Professor Viktor Petrovich Denisenkov.

scholarly journals Study of Machining of Gears with Regular and Modified Outline Using CNC Machine Tools

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2913
Author(s):  
Rafał Gołębski ◽  
Piotr Boral
Keyword(s):  
Machine Tools ◽  
Coordinate Measuring Machine ◽  
Optical Microscope ◽  
Numerical Control ◽  
Cnc Machine Tools ◽  
Cnc Milling ◽  
Cnc Machine ◽  
Cylindrical Gears ◽  
Measuring Machine ◽  
Five Axis

Classic methods of machining cylindrical gears, such as hobbing or circumferential chiseling, require the use of expensive special machine tools and dedicated tools, which makes production unprofitable, especially in small and medium series. Today, special attention is paid to the technology of making gears using universal CNC (computer numerical control) machine tools with standard cheap tools. On the basis of the presented mathematical model, a software was developed to generate a code that controls a machine tool for machining cylindrical gears with straight and modified tooth line using the multipass method. Made of steel 16MnCr5, gear wheels with a straight tooth line and with a longitudinally modified convex-convex tooth line were machined on a five-axis CNC milling machine DMG MORI CMX50U, using solid carbide milling cutters (cylindrical and ball end) for processing. The manufactured gears were inspected on a ZEISS coordinate measuring machine, using the software Gear Pro Involute. The conformity of the outline, the tooth line, and the gear pitch were assessed. The side surfaces of the teeth after machining according to the planned strategy were also assessed; the tests were carried out using the optical microscope Alicona Infinite Focus G5 and the contact profilographometer Taylor Hobson, Talysurf 120. The presented method is able to provide a very good quality of machined gears in relation to competing methods. The great advantage of this method is the use of a tool that is not geometrically related to the shape of the machined gear profile, which allows the production of cylindrical gears with a tooth and profile line other than the standard.

Spectral analysis in research and diagnostics of machine tools

2021 ◽  
pp. 23-27
Author(s):  
Keyword(s):  
Spectral Analysis ◽  
Initial Data ◽  
Spectral Density ◽  
Machine Tools ◽  
Metal Cutting ◽  
Parametric Methods ◽  
Industrial Equipment ◽  
Resolution Capability

The application of classical and parametric spectral analyzes in monitoring the condition of industrial equipment and, in particular, metal-cutting machines is considered. An analysis of the effects associated with the preparation of the initial data and the algorithm for their processing, which impose significant restrictions on the use of classical spectral analysis, is presented. Comparison of parametric methods of spectral analysis based on autoregressive methods is given. Keywords: spectral analysis, diagnostics, resolution capability, spectral density, Prony's exponential analysis. [email protected]

Museum Educational Online Products: Creation Prerequisites and Development Prospects

2021 ◽  
Vol 18 (1) ◽  
pp. 80-92
Author(s):  
Valery E. Gordin ◽  
Irina A. Sizova
Keyword(s):  
Online Education ◽  
Professional Education ◽  
Formal Education ◽  
Online Courses ◽  
Mobile Apps ◽  
Educational Games ◽  
Further Education ◽  
Educational Process ◽  
Education Market ◽  
Higher Professional Education

This article examines online educational products developed by museums both independently and in cooperation with educational institutions. The analysis revealed a pool of museum online products, including mass open online courses (MOOCs), specialized professional online courses (SPOCs), educational games, mobile apps, and podcasts. The authors identify advantages and features of each type of the museum online products (MOPs) and determine the prospects for their inclusion in the educational process.The study aims to reveal the activity of different kinds of museums and museum communities in the development and implementation of educational online products both in their own educational activities, carried out by an increasing number of museums, and in the process of formal and non-formal education in cooperation with universities, schools, and further education institutions that implement it. The study discovered that museums develop both MOOCs that are traditional for the system of higher professional education, and educational online products, such as educational games, podcasts, and mobile applications with educational content, that are not widely used at present, but are promising for formal and, especially, non-formal education. An important result of the study was the conclusion about the common practice of cooperation between museums and universities in the joint development of online products, as well as about the feasibility of deploying such work with institutions of secondary general and vocational education.The authors’ analysis of the system of museum educational online products allowed us to conclude that new players — museums — have appeared in the online education market in the role of organizations that create and use various online resources in their activities, including those that can be used in the field of education.

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