scholarly journals Wear Model of Sliding Rough Surfaces

2021 ◽  
Vol 25 (1) ◽  
pp. 25-37
Author(s):  
A. O. Gorlenko ◽  
E. V. Ageev
Keyword(s):  
Surface Layer ◽  
Electric Current ◽  
Low Voltage ◽  
Calculated Data ◽  
Quality Parameters ◽  
Wear Intensity ◽  
Resource Saving ◽  
Wear Model ◽  
Technological Action ◽  
Friction Surfaces

Purpose of research. To develop a wear model that takes into account the quality parameters of the surface layer and friction conditions, which will allow, through controlled technological action, providing the required wear intensity of friction surfaces.Methods. Electromechanical processing, in particular, can provide the required intensity of friction surfaces wear being carried out in finishing and strengthening modes.An increase in wear resistance, endurance limit and other operational properties, and at the same time a change in the physical, mechanical and geometric parameters of the surface layer of parts is achieved by a combination of thermal and force influences on the surface of the processed part. To achieve this effect, an original installation has been developed, which includes a device for machining based on a universal machine with a set of necessary tools and devices for fixing a workpiece and supplying coolant and electric current of high power and low voltage, as well as an industrial electric current converter and control units for processing modes, switching devices and computers.Results. An approach to the representation of the nature of friction and wear has been proposed. Based on the proposed wear model, which takes into account the quality parameters of the surface layer and friction conditions, it is possible to provide the required wear intensity of friction surfaces through controlled technological action.The developed wear model, which takes into account the quality parameters of the surface layer and friction conditions, makes it possible to provide the required wear intensity of friction surfaces through controlled technological action.Conclusion. The calculated data obtained with the help of the developed model and the data obtained experimentally will find practical application in creating resource-saving processes for processing metal alloys and composite materials.

Study of effect of technological lubricant type and parameters of tool surface layer on characteristics of multitoothed mandrelling methods of holes

2020 ◽  
pp. 246-251
Author(s):  
A.V. Shchedrin ◽  
I.Yu. Ignatkin ◽  
N.Yu. Chikhacheva
Keyword(s):  
Surface Layer ◽  
Quality Parameters ◽  
Tool Surface ◽  
Geometric Quality ◽  
Technological Lubricant

The regularities of the change in the mandrelling forces and the geometric quality parameters of the obtained holes depending on the type of technological lubricant and the parameters of the tool surface layer that implements the scheme of sequential multi-tooth mandrelling are experimentally studied.

Ultrajet Mesodiagnostic Probabilistic Model for Surface Layer’s Variable Defectiveness of Complex Technology Products

2021 ◽  
Vol 882 ◽  
pp. 289-295
Author(s):  
Andrey Leonidovich Galinovskiy ◽  
Aleksandr Aleksandrovich Barzov ◽  
Mary Alekseevna Prokhorova
Keyword(s):  
Surface Layer ◽  
Sufficient Conditions ◽  
Calculated Data ◽  
Hydrodynamic Effect ◽  
Topographic Features ◽  
Technology Products ◽  
Complex Technology ◽  
Materials Used ◽  
Necessary And Sufficient

Technologically, ultrajet mesodiagnostics (UJM) consists of local hydroerosive indentation by ultrajets (UJ) of water on the surface of the analyzed object (OA) and the subsequent study of the results of this minimally invasive microdestructive effect on its surface layer. Obviously, mathematical models’ construction of the functional relationship between the informative-physical signs of hydroerosive UJ destruction and the surface layer’s state parameters of various OA, primarily their defectiveness, is very important for the development of this potentially promising technology for ensuring the quality of critical products, mainly aviation and other industries. In this regard, the work proposes a probabilistic UJM model, which consists of analyzing the kinetics of the formation of an aggregate set of eroded particles, as a process caused by a combination of appropriate necessary and sufficient conditions for its implementation. The former include the topographic features of the microdefectiveness’ characteristics of the surface layer material, and the latter consist of a certain variational-force hydrodynamic effect of the diagnostic UJ on it. This approach made it possible to obtain calculated data related to probabilistic distribution of the UJ-eroded particles’ sizes of hypothetical OA, as a coordinate function describing the microdefects’ concentration in its surface layer. These functions are close to the available results of experimental UJM of typical and promising materials used in the manufacture of machinery technology.

Assessment of power quality parameters and indicators at the point of common coupling in a low voltage power grid with photovoltaic generation emulated

2022 ◽  
Vol 203 ◽  
pp. 107679
Author(s):  
Oscar Pinzón-Quintero ◽  
Daniel Gaviria-Ospina ◽  
Alejandro Parrado-Duque ◽  
Rusber Rodríguez-Velásquez ◽  
German Osma-Pinto
Keyword(s):  
Power Quality ◽  
Low Voltage ◽  
Power Grid ◽  
Quality Parameters ◽  
Photovoltaic Generation ◽  
Point Of Common Coupling ◽  
Common Coupling

scholarly journals Quality assurance of ring gear in cylindrical wheels at processing with combined grinding-polishing worm disk

2019 ◽  
Vol 2018 (2) ◽  
pp. 22-28
Author(s):  
Владимир Макаров ◽  
Vladimir Makarov ◽  
Наталья Ворожцова ◽  
Natalia Vorozhtsova ◽  
Александр Горбунов ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Surface Layer ◽  
Quality Parameters ◽  
Experimental Investigations ◽  
Ring Gear ◽  
Micro Hardness ◽  
Gear Grinding ◽  
Gear Honing ◽  
Surface Residual Stresses ◽  
Comparative Results

The investigation results of technological potentialities in the finish gear grinding of a ring gear of cylindrical wheels with the combined grinding-polishing worm disk with the assurance of geometrical accuracy and quality parameters of a surface layer are shown. The comparative results of experimental investigations of the structure of surface micro-hardness, its depth and surface residual stresses at cog-wheels finish processing with gear honing and gear polish are given.

scholarly journals Profile and contour grinding of compressor blade butts

2016 ◽  
Vol 1 (1) ◽  
pp. 15-19
Author(s):  
В. Полетаев ◽  
V. Poletaev ◽  
Е. Цветков ◽  
E. Tsvetkov
Keyword(s):  
Surface Layer ◽  
Coordinate System ◽  
Quality Parameters ◽  
Compressor Blade ◽  
Improve Performance ◽  
Compressor Blades ◽  
Part Surface ◽  
Required Quality ◽  
Blade Production

The existing technologies of production of compressor blade butts related with traditional machining methods, including broaching and milling. Application of these machining methods requires further superfinishing operations to ensure the required quality of compressor blades. The automated highly-productive grinding of blade butts is an effective method to improve performance and quality of blade production. The technologies of profile and contour grinding of blades of a rotor and a compressor stator provide an automated machining of the outer parts contour in the same coordinate system, implement machining based on 3-D models of theoretical blade surfaces, ensure the required quality parameters of the part surface layer without additional finishing operations.

Surface modification of die steels with B—Al-layers by thermal-chemical treatment

2021 ◽  
pp. 557-564
Author(s):  
N.S. Ulakhanov ◽  
U.L. Mishigdorzhiyn ◽  
A.G. Tikhonov ◽  
A.I. Shustov ◽  
A.S. Pyatykh
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Surface Layer ◽  
Surface Modification ◽  
High Temperature ◽  
Chemical Treatment ◽  
Quality Parameters ◽  
Processing Temperature ◽  
Die Steels ◽  
Composite Layers

The effect of diffusion high-temperature boroaluminizing (HBA) on the mechanical properties and quality parameters of the surface layer of stamp steels 5KhNM and 3Kh2V8F is shown. An analysis of the microstructure and composition of diffusion composite layers obtained as a result of thermal-chemical treatment (TCT) is presented and the distribution of microhardness in these layers is studied depending on the formed borides and carbides. The influence of processing temperature modes of on the parameters of roughness was experimentally established and the wear resistance characteristics of the processed surfaces of the investigated materials were determined.

scholarly journals The formation of the quality parameters of the surface layer by ultrasonic

2018 ◽  
Vol 224 ◽  
pp. 01052
Author(s):  
Vyacheslav Shuvaev ◽  
Nadezhda Krylova
Keyword(s):  
Surface Layer ◽  
Quality Parameters ◽  
Surface Layers ◽  
Torsional Oscillations

In work the questions of hardening of a surface layer of a detail by means of ultrasonic fluctuations are opened. The developed device for forming ultrasonic longitudinal-torsional oscillations is described, which makes it possible to substantially modify the properties of the surface layers of the parts.

Fabrication of a thick surface layer of Al3Ti on Ti substrate by reactive-pulsed electric current sintering

2000 ◽  
Vol 8 (7) ◽  
pp. 815-822 ◽  
Author(s):  
T Matsubara ◽  
T Shibutani ◽  
K Uenishi ◽  
K.F Kobayashi
Keyword(s):  
Surface Layer ◽  
Electric Current ◽  
Pulsed Electric Current

Effect of Low-Voltage Electric Current Pulse on Semi-Solid Microstructure of Magnesium Alloy AZ91D

2011 ◽  
Vol 399-401 ◽  
pp. 1613-1619
Author(s):  
Quan Zhou ◽  
Le Ping Chen ◽  
Jian Yin
Keyword(s):  
Electric Current ◽  
Current Pulse ◽  
Low Voltage ◽  
Processing Parameters ◽  
Dynamic Factor ◽  
Semisolid Slurry ◽  
Az91d Alloy ◽  
Electric Current Pulse ◽  
Alloy Az91d ◽  
Semi Solid

The effect of discharging cycle, voltage, capacitance and time on solidified microstructure of semi-solid slurry of AZ91D alloy treated with Low-Voltage Electric Current Pulse(LVECP) was investigated in this paper. The experimental results show that primary grains of AZ91D alloy were refined apparently, the morphology dendrites of α-Mg were changed by electric current pulse and the nondendritic structure of semi-solid slurry of AZ91D alloy could be obtained with appropriate processing parameters. The decrease of discharging cycle and the increase of discharging voltage and time to prepare semisolid slurry by LVECP discharge promotes the formation of fine α-Mg grains. It is proposed that LVECP treatment created a new dynamic factor for nucleation so that the number of nuclei increased, which restrained the formation of large primary α-Mg dendrites and created a base to form spherical crystals of primary α-Mg. The stronger temperature fluctuation in the melt with many rosette primary α-Mg caused by LVECP discharge and the remelting of the secondary arm roots in the same time are the most important reasons for formation of spherical primary α-Mg grains.

Sign in / Sign up

Export Citation Format

Share Document