An Investigation of Die Wear Behavior During Aluminum Alloy 7075 Tube Extrusion

2012 ◽  
Vol 135 (1) ◽  
Author(s):  
Cunsheng Zhang ◽  
Guoqun Zhao ◽  
Tingting Li ◽  
Yanjin Guan ◽  
Hao Chen ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Friction Coefficient ◽  
Wear Behavior ◽  
Extrusion Force ◽  
Wear Depth ◽  
Process Variables ◽  
Die Wear ◽  
Tube Extrusion ◽  
Ram Speed ◽  
Aluminum Alloy 7075

During hot extrusion process, die wear shortens markedly the service life of extrusion dies under the high-pressure, high-temperature conditions. In this paper, based on modified Archard's wear model, a user-defined subroutine for calculating die wear depth was developed and implanted into DEFORM-3D. On the basis of the numerical model, the die wear behavior during aluminum alloy 7075 tube extrusion has been investigated. The numerical results show that process variables have multiple effects on die wear behavior. With the increasing ram speed, wear depth of die bearing rises and then tends to decline gradually. From the ram speed of 15 mm/s, die wear depth begins to increase again. Wear depth rises suddenly with the increase of friction coefficient, then gradually reduces. When friction coefficient is greater than 0.8, wear depth tends to be a constant. A maximum wear depth occurs at 430 °C of billet temperature, and a minimum wear depth occurs at certain die temperature in the range of 400–425 °C. In addition, the required extrusion force has strong dependence on process variables. The extrusion force rises clearly with the increase of ram speed and friction coefficient and with the decrease of initial temperatures of billet and die.

Calculation Model of Punch Force during Tube Extrusion

2011 ◽  
Vol 704-705 ◽  
pp. 273-276
Author(s):  
Zhong Tang Wang ◽  
Guang Xia Qi ◽  
Fang Wang ◽  
Shi Hong Zhang
Keyword(s):  
Experimental Study ◽  
Friction Coefficient ◽  
Calculation Model ◽  
Extrusion Force ◽  
Calculation Formula ◽  
Slab Method ◽  
Punch Force ◽  
Tube Extrusion ◽  
Relative Errors ◽  
Theoretical Results

] Theoretical calculation formula of punch force during tube extrusion has been proposed by means of slab method. On the basis of theoretical and experimental study, it is found that theoretical results of extrusion force given by the calculating formula approached to that of the experiment, and the relative errors are less than 20％. It is also found that the extrusion force is closely related to deformation temperature, lubricant and the ratio of extrusion. The calculating formula of extrusion force is given by considering the factors which are the conical angle of die, and the friction coefficient between the deformation zone and the extrusion container, and the friction coefficient between the undeformed zone and the mandrel. Key Words: Tube, Extrusion, Force, Physical model

Effect of Process Parameters on Die Wear Behavior of Aluminum Alloy Rod Extrusion

2013 ◽  
Vol 28 (3) ◽  
pp. 312-318 ◽  
Author(s):  
Tingting Li ◽  
Guoqun Zhao ◽  
Cunsheng Zhang ◽  
Yanjin Guan ◽  
Xuemei Sun ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Process Parameters ◽  
Wear Behavior ◽  
Die Wear

The Influence of Antagonist Radii on Friction and Wear of Dental Ceramics

2007 ◽  
Vol 330-332 ◽  
pp. 1255-1258 ◽  
Author(s):  
Hai Yang Yu ◽  
Shan Shan Gao ◽  
Zhen Bing Cai ◽  
Min Hao Zhu
Keyword(s):  
Friction Coefficient ◽  
Laser Scanning ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Artificial Saliva ◽  
Wear Depth ◽  
Dental Ceramics ◽  
Scanning Microscope ◽  
Oral Conditions ◽  
Lubrication Effect

The friction and wear behavior of dental ceramics (Vita VMK95) against uniform Si3N4 balls has been investigated using a small amplitude reciprocating apparatus under simulated oral conditions. The variables of ball radii (2mm, 6 mm, 13mm, and 21mm), load (10N, 20N, 30N, and 40N), reciprocating amplitude (200(m), frequency (2Hz) and use of artificial saliva lubrication or no lubrication were selected. Tests lasting up to 10,000 cycles were conducted. The wear scars of the samples were characterized with 3-D con focused laser-scanning microscope. The wear depths were analyzed statistically. The correlations between the wear behaviors and antagonist radii were also compared. The results show the friction coefficient of dental porcelain goes up with the decreasing of antagonist radii, and the wear depth decreases with the antagonist diameters. Load and lubrication effect is significant for friction coefficient and wear depth. The friction and wear mechanism of dental ceramics was characterized by abrasive wear and delaminating.

scholarly journals Regression Analysis of the Effect of Bias Voltage on Nano- and Macrotribological Properties of Diamond-Like Carbon Films Deposited by a Filtered Cathodic Vacuum Arc Ion-Plating Method

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Shojiro Miyake ◽  
Takanori Shindo ◽  
Masatoshi Miyake
Keyword(s):  
Friction Coefficient ◽  
Bias Voltage ◽  
Wear Behavior ◽  
Vacuum Arc ◽  
Diamond Like Carbon ◽  
Wear Depth ◽  
Nanoindentation Hardness ◽  
Dc Bias ◽  
Filtered Cathodic Vacuum Arc ◽  
Disk Test

Diamond-like carbon (DLC) films are deposited by bend filtered cathodic vacuum arc (FCVA) technique with DC and pulsed bias voltage. The effects of varying bias voltage on nanoindentation and nanowear properties were evaluated by atomic force microscopy. DLC films deposited with DC bias voltage of −50 V exhibited the greatest hardness at approximately 50 GPa, a low modulus of dissipation, low elastic modulus to nanoindentation hardness ratio, and high nanowear resistance. Nanoindentation hardness was positively correlated with the Raman peak ratioId/Ig, whereas wear depth was negatively correlated with this ratio. These nanotribological properties highly depend on the films’ nanostructures. The tribological properties of the FCVA-DLC films were also investigated using a ball-on-disk test. The average friction coefficient of DLC films deposited with DC bias voltage was lower than that of DLC films deposited with pulse bias voltage. The friction coefficient calculated from the ball-on-disk test was correlated with the nanoindentation hardness in dry conditions. However, under boundary lubrication conditions, the friction coefficient and specific wear rate had little correlation with nanoindentation hardness, and wear behavior seemed to be influenced by other factors such as adhesion strength between the film and substrate.

Effects of WC grain size and Co content on microscale wear behavior of micro end mills in aluminum alloy 7075 machining

2019 ◽  
Vol 104 (5-8) ◽  
pp. 2401-2413 ◽  
Author(s):  
Peng Gao ◽  
Xibin Wang ◽  
Zhiqiang Liang ◽  
Junfeng Xiang ◽  
Wei Li ◽  
...  
Keyword(s):  
Grain Size ◽  
Aluminum Alloy ◽  
Wear Behavior ◽  
End Mills ◽  
Aluminum Alloy 7075

Study of Friction and Wear Behavior of Ni-P-β-SiC Composition Coating on Aluminum Alloy

2014 ◽  
Vol 809-810 ◽  
pp. 676-681
Author(s):  
Da Wei Yi
Keyword(s):  
Weight Loss ◽  
Aluminum Alloy ◽  
Friction Coefficient ◽  
Composite Coating ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Test Results ◽  
Friction And Wear Behavior ◽  
Wear Weight Loss ◽  
Coefficient Increase

Ni-P-β-SiC was prepared using different granularity β-SiC and rolling electroless plating technology. The test results show that β-SiC particles in composite coating are uniform, and the thickness and hardness of composite coating are 17~25μm and 520~620HV, respectively. At the same time, the friction and wear behavior of Ni-P-β-SiC composition coating have been studied. The results show that the wear weight loss decrease and the friction coefficient increase with the increase of β-SiC granularity.

scholarly journals Estimation of Wear Resistance for Multilayer Coatings Obtained by Nitrogenchroming

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1153
Author(s):  
Ivan Pavlenko ◽  
Jozef Zajac ◽  
Nadiia Kharchenko ◽  
Ján Duplák ◽  
Vitalii Ivanov ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Spectral Analysis ◽  
Friction Coefficient ◽  
Cutting Tools ◽  
Wear Intensity ◽  
Maximum Amount ◽  
Multilayer Coatings ◽  
Wear Depth ◽  
X Ray ◽  
Machine Parts

This article deals with improving the wear resistance of multilayer coatings as a fundamental problem in metal surface treatment, strengthening elements of cutting tools, and ensuring the reliability of machine parts. It aims to evaluate the wear depth for multilayer coatings by the mass loss distribution in layers. The article’s primary purpose is to develop a mathematical method for assessing the value of wear for multilayer steel-based coatings. The study material is a multilayer coating applied to steel DIN C80W1. The research was performed using up-to-date laboratory equipment. Nitrogenchroming has been realized under overpressure in two successive stages: nitriding for 36 h at temperature 540 °C and chromizing during 4 h at temperature 1050 °C. The complex analysis included several options: X-ray phase analysis, local micro-X-ray spectral analysis, durometric analysis, and determination of wear resistance. These analyses showed that after nitrogenchroming, the three-layer protective coating from Cr23C6, Cr7C3, and Cr2N was formed on the steel surface. Spectral analysis indicated that the maximum amount of chromium 92.2% is in the first layer from Cr23C6. The maximum amount of carbon 8.9% characterizes the layer from Cr7C3. Nitrogen is concentrated mainly in the Cr2N layer, and its maximum amount is 9.4%. Additionally, it was determined that the minimum wear is typical for steel DIN C80W1 after nitrogenchroming. The weight loss of steel samples by 25 mg was obtained. This value differs by 3.6% from the results evaluated analytically using the developed mathematical model of wear of multilayer coatings after complex metallization of steel DIN C80W1. As a result, the impact of the loading mode on the wear intensity of steel was established. As the loading time increases, the friction coefficient of the coated samples decreases. Among the studied samples, plates from steel DIN C80W1 have the lowest friction coefficient after nitrogenchroming. Additionally, a linear dependence of the mass losses on the wearing time was obtained for carbide and nitride coatings. Finally, an increase in loading time leads to an increase in the wear intensity of steels after nitrogenchroming. The achieved scientific results are applicable in developing methods of chemical-thermal treatment, improving the wear resistance of multilayer coatings, and strengthening highly loaded machine parts and cutting tools.

scholarly journals Comparison between multi-walled carbon nanotubes and titanium dioxide nanoparticles as additives on performance of turbine meter oil nano lubricant

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hadi Pourpasha ◽  
Saeed Zeinali Heris ◽  
Yaghob Mohammadfam
Keyword(s):  
Carbon Nanotubes ◽  
Titanium Dioxide ◽  
Friction Coefficient ◽  
Pressure Drop ◽  
Mass Fraction ◽  
Viscosity Index ◽  
Wear Depth ◽  
Nano Lubricant ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

AbstractThis research aims of compare the impact of the mass fraction of multi-walled carbon nanotubes (MWCNTs) and titanium dioxide (TiO2) nano additive on the tribological and thermophysical attributes of turbine meter oil. These attributes include the average friction coefficient, pressure drop, wear, flash point, pour point, relative viscosity, kinematics viscosity, and viscosity index. The pressure drops and the average friction coefficient inside the copper tube were simulated and compared with experimental results. In this study, for the synthesis of nano lubricants from turbine meter oil as a pure fluid and from MWCNTs and TiO2 as nano additives in the mass fraction of 0.05, 0.1, 0.2, 0.3, and 0.4 wt.% and from oleic acid and Triton x100 as surfactants were utilized. The results illustrated that the wear depth of copper pins in the presence of nano lubricant with 0.4 wt.% of MWCNTs and 0.1 wt.% TiO2 was improved by 88.26% and 71.43%, respectively. Increasing 0.3 wt.% of TiO2 and MWCNTs into the oil caused to improvement in viscosity index. The simulation data and experimental data for the pressure drop were closer together and indicated a minor error that the maximum error is less than 10%.

THE EFFECT OF ELECTROLYTE TEMPERATURE AND SEALING SOLUTION IN ANODIZING OPERATION ON HARDNESS AND WEAR BEHAVIOR OF 7075 -T6 ALUMINUM ALLOY

2019 ◽  
Vol 26 (02) ◽  
pp. 1850143
Author(s):  
SAEED NIYAZBAKHSH ◽  
KAMRAN AMINI ◽  
FARHAD GHARAVI
Keyword(s):  
Weight Loss ◽  
Wear Resistance ◽  
Aluminum Alloy ◽  
Wear Behavior ◽  
Anodic Oxide ◽  
Boiling Water ◽  
Electrolyte Temperature ◽  
Oxide Coatings ◽  
Sodium Dichromate ◽  
Pin On Disk

Anodic oxide coatings are applied on aluminum alloys in order to improve corrosion resistance and to increase hardness and wear resistance. In the current study, a hard anodic coating was applied on AA7075-T6 aluminum alloy. To survey the anodizing temperature (electrolyte temperature) effect, three temperatures, namely, [Formula: see text]C, 0∘C and 5∘C were chosen and the samples were sealed in boiling water and sodium dichromate to study the role of sealing. For measuring the oxide coatings porosity and hardness and also for comparing the samples’ wear resistance field-emission scanning electron microscopy (FESEM), microhardness test and pin-on-disk method were utilized, respectively. The results showed that by increasing the anodizing temperature, hardness and consequently wear resistance decreased so that hardness and weight loss in the samples with no sealing decreased from 460[Formula: see text]HV and 0.61[Formula: see text]mg at [Formula: see text]C to 405 and 358[Formula: see text]HV and 1.05 and 1.12[Formula: see text]mg at 0∘C and 5∘C, respectively, which is due to the porosity increment by increasing the anodizing temperature. Also, sealing in boiling water and dichromate contributed to soft phases and coating hydration, which resulted in a decrease in hardness and wear resistance. Hardness and weight loss in the coated samples at [Formula: see text]C decreased from 460[Formula: see text]HV and 0.61[Formula: see text]mg in the samples with no sealing to 435 and 417[Formula: see text]HV and 0.72 and 0.83[Formula: see text]mg in the samples sealed in boiling water and dichromate, respectively.

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