Experimental Investigations in Turning of Steel Alloy Under Different Lubrication Conditions

2019 ◽  
pp. 257-270
Author(s):  
A. Venkata Vishnu ◽  
P. Jamaleswara Kumar
Keyword(s):  
Experimental Investigations ◽  
Steel Alloy ◽  
Lubrication Conditions

scholarly journals EXPERIMENTAL EVALUATION OF DRAW BEAD COEFFICIENT OF FRICTION

2017 ◽  
Vol 23 (4) ◽  
pp. 337 ◽  
Author(s):  
Tomasz Trzepieciński ◽  
Romuald Fejkiel ◽  
Andrzej Kubit
Keyword(s):  
Friction Coefficient ◽  
Dry Friction ◽  
Digital Image Analysis ◽  
Test Material ◽  
Experimental Investigations ◽  
Special Device ◽  
Degree Of Deformation ◽  
Tool Surface ◽  
Sheet Deformation ◽  
Lubrication Conditions

<p class="AMSmaintext">In this paper the results both of friction coefficient and springback testing using a drawbead test are presented. Deep drawing quality steel sheet (DC04 according to EN 10130:2009 standard) was used as a test material. The experimental investigations were carried out using a special device that allows a change in the degree of deformation of the sheet metal on the drawbead. The friction tests were carried out for different values of tool surface roughness, specimen widths and degrees of sheet deformation. Three lubrication conditions were analysed: dry friction, machine oil lubrication and lubrication by using methacrylic resin. The springback values are determined based on the digital image analysis for selected friction conditions. It was found that effectiveness of reducing of friction coefficient value during pulling a sheet on the drawbead depends not only on the used lubricant, but also on the degree of sheet deformation (displacement of the middle roll). The sheet widths influence the friction coefficient value by the character of sheet deformation during pulling the sheet through the drawbead.</p>

Experimental Investigations Into the Behavior of Elastohydrodynamic Lubricating Films

1982 ◽  
Vol 104 (1) ◽  
pp. 91-98 ◽  
Author(s):  
G. S. A. Shawki ◽  
M. O. A. Mokhtar ◽  
A. A. Abdel-Ghany
Keyword(s):  
Temperature Distribution ◽  
Film Thickness ◽  
Elastohydrodynamic Lubrication ◽  
Contact Temperature ◽  
Experimental Investigations ◽  
Capacitive Transducer ◽  
Full Contact ◽  
The Subject ◽  
Critical Reduction ◽  
Lubrication Conditions

This paper presents the results of experimental investigations conducted on a disk machine specially designed and constructed to determine film behavior under elastohydrodynamic lubrication conditions. Oil film thickness is measured by a novel electronic technique utilizing a capacitive transducer. Besides film geometry, measurements include temperature distribution and frictional traction in the film, all taken under pure sliding conditions. Recordings of full contact profile confirm by way of example the development of a critical reduction in film thickness towards the exit end of the Hertzian zone, this being accompanied by a critical increase in contact temperature. Further work on the subject is proceeding.

scholarly journals An Experimental Study of the Frictional Properties of Steel Sheets Using the Drawbead Simulator Test

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4037 ◽  
Author(s):  
Trzepiecinski ◽  
Kubit ◽  
Slota ◽  
Fejkiel
Keyword(s):  
Coefficient Of Friction ◽  
Extreme Values ◽  
Rolling Direction ◽  
Frictional Resistance ◽  
Friction Reduction ◽  
Experimental Investigations ◽  
Sheet Rolling ◽  
The Coefficient Of Friction ◽  
The Difference ◽  
Lubrication Conditions

This article presents the results of an experimental investigation of the frictional resistance arising in a drawbead during sheet metal forming. The frictional characterization of DC04 deep drawing quality steels commonly used in the automotive industry is carried out using a friction simulator. The effects of some parameters of the friction process on the value of the coefficient of friction have been considered in the experimental investigations. The friction tests have been conducted on different strip specimens, lubrication conditions, heights of drawbead and specimen orientations in relation to the sheet rolling direction. The results of drawbead simulator tests demonstrate the relationship that the value of the coefficient of friction of the test sheets without lubrication is higher than in the case of lubricated sheets. The lubricant reduces the coefficient of friction, but the effectiveness of its reduction depends on the drawbead height and lubrication conditions. Moreover, the effectiveness of the reduction of the coefficient of friction by the lubricant depends on the specimen orientation according to the sheet rolling direction. In the drawbead test, the specimens oriented along the rolling direction demonstrate a higher value of coefficient of friction when compared to the samples cut transverse to the rolling direction. The smaller the width of the specimen, the lower the coefficient of friction observed. The difference in the coefficient of friction for the extreme values of the widths of the specimens was about 0.03–0.05. The use of machine oil reduced the coefficient of friction by 0.02–0.03 over the whole range of drawbead heights. Heavy duty lubricant even reduced the frictional resistances by over 50% compared to dry friction conditions. The effectiveness of friction reduction by machine oil does not exceed 30%.

Numerical-Stochastic Modeling and Simulation of Deep Drawing Tinplate Rings

2005 ◽  
Vol 6-8 ◽  
pp. 329-336 ◽  
Author(s):  
Branimir Barisic ◽  
Tomaz Pepelnjak ◽  
Karl Kuzman
Keyword(s):  
Modeling And Simulation ◽  
Stochastic Modeling ◽  
Deep Drawing ◽  
Fem Analysis ◽  
Experimental Investigations ◽  
European Standard ◽  
Factorial Experimental Design ◽  
Complex Interplay ◽  
Die Geometry ◽  
Lubrication Conditions

Deep drawing process, although deceptively simple, involves a complex interplay between material properties, die geometry, process variables and also friction (lubrication) conditions. Numerical and stochastic modeling and simulation of this process means defining the correlation among the variables of the process in order to improve the existing processes. Using the Box-Wilson¢s multi factorial experimental design the stochastic, numerical and experimental investigations on the thinwalled tinplate rings (material: TS 260, TS 275, TH 415, TH 435, TH 520 according to the European Standard EN 10202) were performed. The FEM analysis applying ABAQUS Explicit code as well as stochastic analysis have been used in order to predict the influences of wall thickness and lubrication on reducing drawing force and estimate its influence on process consumed energy. The accuracy of the numerical and stochastic results is confirmed through the comparison with the experimental results.

Experimental investigations of the use of cartilage in tympanic membrane reconstruction

2000 ◽  
Vol 21 (3) ◽  
pp. 322-328 ◽  
Author(s):  
T ZAHNERT ◽  
K HUTTENBRINK ◽  
D MURBE ◽  
M BORNITZ
Keyword(s):  
Tympanic Membrane ◽  
Experimental Investigations

EXPERIMENTAL INVESTIGATIONS OF THE QUANTUM PHOTOVOLTAIC EFFECT IN InAs-GaSb SEMICONDUCTOR SUPERLATTICES

1987 ◽  
Vol 48 (C5) ◽  
pp. C5-183-C5-186
Author(s):  
J. BLEUSE ◽  
P. VOISIN ◽  
M. VOOS ◽  
L. L. CHANG ◽  
L. ESAKI
Keyword(s):  
Photovoltaic Effect ◽  
Experimental Investigations ◽  
Semiconductor Superlattices

Evaluation of the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings by the multi-frequency radio wave method of a slow surface electromagnetic waves

2020 ◽  
pp. 51-58
Author(s):  
Aleksandr I. Kazmin ◽  
Pavel A. Fedjunin
Keyword(s):  
Radio Wave ◽  
Noise Level ◽  
Electromagnetic Waves ◽  
Dielectric Materials ◽  
Geometric Parameters ◽  
Experimental Investigations ◽  
Wave Method ◽  
Dielectric Coatings ◽  
Surface Electromagnetic Waves ◽  
Multilayer Dielectric

One of the most important diagnostic problems multilayer dielectric materials and coatings is the development of methods for quantitative interpretation of the checkout results their electrophysical and geometric parameters. The results of a study of the potential informativeness of the multi-frequency radio wave method of surface electromagnetic waves during reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings are presented. The simulation model is presented that makes it possible to evaluate of the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings. The model takes into account the values of the electrophysical and geometric parameters of the coating, the noise level in the measurement data and the measurement bandwidth. The results of simulation and experimental investigations of reconstruction of the structure of relative permittivitties and thicknesses of single-layer and double-layer dielectric coatings with different thicknesses, with different values of the standard deviation (RMS) of the noise level in the measured attenuation coefficients of the surface slow electromagnetic wave are presented. Coatings based on the following materials were investigated: polymethyl methacrylate, F-4D PTFE, RO3010. The accuracy of reconstruction of the electrophysical parameters of the layers decreases with an increase in the number of evaluated parameters and an increase in the noise level. The accuracy of the estimates of the electrophysical parameters of the layers also decreases with a decrease in their relative permittivity and thickness. The results of experimental studies confirm the adequacy of the developed simulation model. The presented model allows for a specific measuring complex that implements the multi-frequency radio wave method of surface electromagnetic waves, to quantify the potential possibilities for the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric materials and coatings. Experimental investigations and simulation results of a multilayer dielectric coating demonstrated the theoretical capabilities gained relative error permittivity and thickness of the individual layers with relative error not greater than 10 %, with a measurement bandwidth of 1 GHz and RMS of noise level 0,003–0,004.

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