scholarly journals RESEARCH OF THE CUTTING MECHANISM AT ELECTRICAL DISCHARGE GRINDING

2021 ◽  
pp. 37-44
Author(s):  
Roman Strelchuk ◽  
Oleksandr Shelkovyi
Keyword(s):  
Mathematical Modeling ◽  
Electrical Discharge ◽  
Geometric Modeling ◽  
Functional Dependence ◽  
Hard Alloys ◽  
Technological Parameters ◽  
Cutting Mechanism ◽  
Modes Of Processing

The paper presents the results of a study of the cutting mechanism during electrical discharge grinding of hard alloys. The cutting mechanism during electrical discharge grinding was studied using mathematical modeling. By means of geometric modeling, a method of grinding cup wear was developed. The functional dependence of the diamonds use factor in the Kw wheel on the technological parameters of processing, wear and tool characteristics were determined. Analysis of the results of the study shows that an increase in efficiency at electrical discharge grinding can be achieved by reducing the wear of S, and by corresponding variation in the concentration of diamonds and technological modes of processing.

scholarly journals Simulation of Diffusion Processes in Chemical and Thermal Processing of Machine Parts

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 698
Author(s):  
Kateryna Kostyk ◽  
Michal Hatala ◽  
Viktoriia Kostyk ◽  
Vitalii Ivanov ◽  
Ivan Pavlenko ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Temperature Distribution ◽  
Thermal Treatment ◽  
Diffusion Processes ◽  
Nitrogen Concentration ◽  
The Body ◽  
Functional Dependencies ◽  
Technological Parameters ◽  
Gas Nitriding ◽  
Temperature State

To solve a number of technological issues, it is advisable to use mathematical modeling, which will allow us to obtain the dependences of the influence of the technological parameters of chemical and thermal treatment processes on forming the depth of the diffusion layers of steels and alloys. The paper presents mathematical modeling of diffusion processes based on the existing chemical and thermal treatment of steel parts. Mathematical modeling is considered on the example of 38Cr2MoAl steel after gas nitriding. The gas nitriding technology was carried out at different temperatures for a duration of 20, 50, and 80 h in the SSHAM-12.12/7 electric furnace. When modeling the diffusion processes of surface hardening of parts in general, providing a specifically given distribution of nitrogen concentration over the diffusion layer’s depth from the product’s surface was solved. The model of the diffusion stage is used under the following assumptions: The diffusion coefficient of the saturating element primarily depends on temperature changes; the metal surface is instantly saturated to equilibrium concentrations with the saturating atmosphere; the surface layer and the entire product are heated unevenly, that is, the product temperature is a function of time and coordinates. Having satisfied the limit, initial, and boundary conditions, the temperature distribution equations over the diffusion layer’s depth were obtained. The final determination of the temperature was solved by an iterative method. Mathematical modeling allowed us to get functional dependencies for calculating the temperature distribution over the depth of the layer and studying the influence of various factors on the body’s temperature state of the body.

scholarly journals On Adaptive Control for Electrical Discharge Machining Using Vibroacoustic Emission

Technologies ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 96 ◽  
Author(s):  
Yury Melnik ◽  
Mikhail Kozochkin ◽  
Artur Porvatov ◽  
Anna Okunkova
Keyword(s):  
Adaptive Control ◽  
Control System ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Hard Alloys ◽  
Monitoring And Control ◽  
Working Zone ◽  
Conductive Ceramics ◽  
And Control ◽  
Adequate Data

The article is related to the research of the parameters of vibroacoustic emission for development of the monitoring and adaptive control system for electrical discharge machining. The classical control system based on a response of electrical parameters does not give an adequate data in the cases of a new class of materials processing as conductive ceramics reinforced by conductive nano additives and carbon nanotubes and whiskers. The idle pulses, which are working on the destruction of the erosion products in the gap, count as working pulses. The application of the monitoring and control tools based on vibroacoustic emission gives adequate data about conditions in the working zone. The developed system is available to count only impulses involved in working on the destruction of the workpiece. The experiments were conducted on the samples of materials with a low melting point as austenitic steel and aluminum alloy, and hard alloys. The records of vibroacoustic signals were analyzed for detection of the monitoring and adaptive control criteria.

Study Regarding Process of the Electrical Discharge Machining with Magnetic Activation of the Welded Joints of some Materials High Alloy Steel

2021 ◽  
Vol 890 ◽  
pp. 141-146
Author(s):  
Mihail Aurel Țîțu ◽  
Dumitru Mnerie ◽  
Diana Cristina Dragomir ◽  
Gabriela Victoria Mnerie
Keyword(s):  
Alloy Steel ◽  
Welded Joints ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Scientific Paper ◽  
Electric Discharges ◽  
Technological Parameters ◽  
High Alloy ◽  
High Alloy Steel ◽  
Magnetic Activation

The scientific paper presents an extensive research on modeling and optimizing the technological parameters of the process for processing by processing electric discharges with massive electrode with and without magnetic activation. Scientific research is based on real data collected from the process of electrical discharges performed on various samples extracted from areas of welded joints of metal components made of high alloy steel. The processing of experimental data was performed both classically and actively, especially the method of the central factorial experiment composed of orthogonal and rotary. The process parameters that were initially modeled and subsequently optimized were based on a series of independent variables characteristic of dimensional processing by copying the shape of the electrical discharge processing. Subsequent research conclusions and directions, as well as original contributions, are an experimentally validated point of view and worthy of consideration. All these fundamental ideas highlighted above find their explanations and the corresponding explicit treatment in the content of this scientific paper that addresses both managers at all levels and researchers.

Mathematical Modeling of the Test Process of Construction Materials

2019 ◽  
Vol 828 ◽  
pp. 115-120 ◽  
Author(s):  
Narine Pirumyan ◽  
Mihran Stakyan ◽  
Gagik Galstyan
Keyword(s):  
Mathematical Modeling ◽  
Building Materials ◽  
Computational Algorithm ◽  
Least Squares Method ◽  
Construction Materials ◽  
Building Structures ◽  
Technological Parameters ◽  
Processing Data ◽  
Optimization Principle ◽  
Test Process

A mathematical model has been proposed for processing data from tests of building materials and obtaining optimal links between the characteristics of the bearing capacity and technological parameters of building materials for the use of these connections in refined design and construction procedures for building structures. To improve the accuracy of the results obtained, a three-level optimization principle was applied using the least squares method and a computational algorithm was compiled that allows us to develop an additional computational subroutine expanding the capabilities of the corresponding standard computer programs.

Technical Support for the Health of the Reducers of Construction Machines on the Basis of Application Device for the Application of Hard Coatings

2019 ◽  
Vol 945 ◽  
pp. 724-728
Author(s):  
O.V. Burlachenko ◽  
V.N. Zlobin ◽  
A.O. Burlachenko
Keyword(s):  
New Technology ◽  
Hard Coatings ◽  
Hard Alloys ◽  
Gear Teeth ◽  
Hard Materials ◽  
Diffusion Coatings ◽  
Hardening Coatings ◽  
Modes Of Processing ◽  
Machine Parts ◽  
Experimental Researches

The new technology of ensuring efficiency of reducers of construction machines is offered. The technology is based on the application of hardening coatings on the contact surface of the gear teeth. To implement the method, the authors developed an installation for applying hardening coatings by ion implantation. Similar devices used for the application of hard materials in the form of diffusion coatings on hot parts of tooling and machine parts are described. It is shown that the proposed installation has a greater technical and economic efficiency compared to existing analogues. The description of the design and operating principle of the proposed device is presented. The results of experimental researches of efficiency of the offered technology are presented. The modes of processing allowing to achieve the maximum indexes of working capacity are picked up. The conducted researches have shown the efficiency of the offered technology for the details from hard alloys.

scholarly journals A Mathematical Modeling to Predict the Cutting Forces in Microdrilling

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Haoqiang Zhang ◽  
Xibin Wang ◽  
Siqin Pang
Keyword(s):  
Mathematical Modeling ◽  
Cutting Forces ◽  
Chip Thickness ◽  
Cutting Edge ◽  
Force Model ◽  
Cutting Mechanism ◽  
Line Field ◽  
Slip Line Field ◽  
Cutting Model ◽  
Secondary Cutting

In microdrilling, because of lower feed, the microdrill cutting edge radius is comparable to the chip thickness. The cutting edges therefore should be regarded as rounded edges, which results in a more complex cutting mechanism. Because of this, the macrodrilling thrust modeling is not suitable for microdrilling. In this paper, a mathematical modeling to predict microdrilling thrust is developed, and the geometric characteristics of microdrill were considered in force models. The thrust is modeled in three parts: major cutting edges, secondary cutting edge, and indentation zone. Based on slip-line field theory, the major cutting edges and secondary cutting edge are divided into elements, and the elemental forces are determined by an oblique cutting model and an orthogonal model, respectively. The thrust modeling of the major cutting edges and second cutting edge includes two different kinds of processes: shearing and ploughing. The indentation zone is modeled as a rigid wedge. The force model is verified by comparing the predicted forces and the measured cutting forces.

A Study on Mathematical Modeling Technology for Magnetic-Fluid Grinding

2011 ◽  
Vol 335-336 ◽  
pp. 406-410
Author(s):  
Shu Qin Wu ◽  
Yao Ming Li
Keyword(s):  
Mathematical Modeling ◽  
Magnetic Field ◽  
Magnetic Fluid ◽  
Work Piece ◽  
Technological Parameters ◽  
Si3n4 Ceramic ◽  
Working Mechanism ◽  
Modeling Technology ◽  
Magnetic Center ◽  
Grinding Time

The paper introduces the precision processing technology of grinding using magnetic fluid and presents the working mechanism of magnetic-fluid grinding. Based on Preston Equation, it also establishes a mathematical modeling for magnetic-fluid grinding, which is used to study the relationships between the effects of grinding and the variation of such technological parameters as the revolving speed of work-piece, the intensity of magnetic field, the distance between work-piece surface and magnetic center, the size of the magnetic fluid and grinding time, etc. Analysis on the grinding of Si3N4 ceramic-balls proves that the model has been well established.

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