Investigation on notch wear mechanism in finish turning pure iron material with uncoated carbide tools under different cooling/lubrication conditions

2015 ◽  
Vol 86 (1-4) ◽  
pp. 97-105 ◽  
Author(s):  
Jinxing Kong ◽  
Zhihui Xia ◽  
Dongming Xu ◽  
Ning He
Keyword(s):  
Wear Mechanism ◽  
Pure Iron ◽  
Finish Turning ◽  
Iron Material ◽  
Notch Wear ◽  
Lubrication Conditions

Measurement of roller chain wear lubricated with palm oil-based hexagonal boron nitride nanoparticles

2020 ◽  
Vol 72 (10) ◽  
pp. 1199-1204
Author(s):  
Hilmi Amiruddin ◽  
Mohd Fadzli Bin Abdollah ◽  
Muhamad Aliff Danial Mohamad Nizar
Keyword(s):  
Boron Nitride ◽  
Palm Oil ◽  
Wear Mechanism ◽  
Hexagonal Boron Nitride ◽  
Wear Performance ◽  
Content Type ◽  
Roller Chain ◽  
Resistance Torque ◽  
Torque Values ◽  
Lubrication Conditions

Purpose This study aims to introduce a novel technique which helped in quantifying the wear performance of a roller chain which was lubricated by using the palm oil-based hexagonal boron nitride (hBN) nanoparticles (nano-biolubricant). Design/methodology/approach The efficiency of the nano-biolubricant was evaluated by using a custom-made roller chain tribometer, at different resistance torque values at a constant speed and running time. Prior to the test, 2 different lubrication conditions were applied. The mass loss and elongation behaviour of a roller chain was selected as a degradation metric for monitoring the amount of the chain wear. The predominant wear mechanism of a roller chain was identified by surface morphological analysis. Findings Regardless of the lubrication conditions, the wear performance of the roller chain was significantly increased, at increasing resistance torque values. Higher wear was noted when the roller chain was lubricated using a nano-biolubricant, however, the wear curve showed a promising high chain life. The predominant wear mechanism involved is abrasive wear. Originality/value Although an increase in the elongation during running is based on the wear between the pins and roller, none of the earlier studies quantified the wear performance of a roller chain under differing lubrication conditions. Hence, for bridging the gap, this study described a new method for measuring the wear performance of the roller chain which was lubricated using the palm oil-based hBN nanoparticles or a nano-biolubricant. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-02-2020-0061/

Atmospheric pressure plasma-assisted precision turning of pure iron material

2020 ◽  
Vol 106 (11-12) ◽  
pp. 5187-5197
Author(s):  
Xin Liu ◽  
Fan Zhang ◽  
Jiyu Liu ◽  
Jichao Zhang ◽  
Yang Chen ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Pure Iron ◽  
Atmospheric Pressure Plasma ◽  
Precision Turning ◽  
Pressure Plasma ◽  
Iron Material

scholarly journals Surface Physical and Chemical Modification of Pure Iron by Using Atmospheric Pressure Plasma Treatment

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4775
Author(s):  
Jinxing Kong ◽  
Dongxing Du ◽  
Aisheng Song ◽  
Fan Zhang ◽  
Wen Huang
Keyword(s):  
Molecular Dynamics ◽  
Plasma Treatment ◽  
Atmospheric Pressure ◽  
Pure Iron ◽  
Atmospheric Pressure Plasma ◽  
Surface Wettability ◽  
Dynamics Simulation ◽  
Surface Binding ◽  
Pressure Plasma ◽  
Iron Material

To investigate the mechanism of surface modification of pure iron by atmospheric pressure plasma treatment (APPT), the surface wettability of pure iron was characterized by using a contact-angle measuring instrument, and the mechanical properties of pure iron were measured by a tensile testing machine and nanoindentation instrument. Molecular dynamics simulations were used to explain the modification mechanism of the surface wettability and the mechanical behavior of pure iron by APPT. The experimental results show that pure iron treated by APPT is superhydrophilic, with reduced tensile strength and surface hardness. This result agrees with the molecular dynamics simulation, which shows that the pure iron material hydrophilicity improved after APPT. The behavior was attributed to the formation of hydrogen bonds on the surface of the pure iron after APPT. The surface binding energy of the pure iron material increased between the water molecule and the residual N atom that was induced by APPT. The N atom that was introduced by the APPT led to Fe bond fracture, and the N atom reduced the Fe bond strength, which resulted in a reduction of material yield strength and microhardness.

Investigation of wear mechanism of forged steel piston skirt under boundary lubricated conditions

2018 ◽  
Vol 70 (7) ◽  
pp. 1303-1309
Author(s):  
Zhang Jian ◽  
Deng Lijun ◽  
Hao Guannan ◽  
Liu Shiying
Keyword(s):  
Surface Roughness ◽  
Wear Mechanism ◽  
Boundary Lubrication ◽  
Normal Load ◽  
Testing Machine ◽  
Wear Model ◽  
Content Type ◽  
Piston Skirt ◽  
Steel Piston ◽  
Lubrication Conditions

Purpose With the implementation of new emission standards, the thermal–mechanical coupling load of engine pistons becomes more important. In this case, forged steel material with higher fatigue limit and impact resistance has been applied gradually in piston manufacturing. However, new failure problems emerge, and the wear of skirt under boundary lubrication conditions is an essential problem which needs to be solved urgently. Design/methodology/approach In this research, the abrasion testing machine was used to simulate the wear behavior under different conditions of normal pressure, relative velocity and surface roughness. Besides, the wear morphology was observed by scanning electron microscope. Then, the wear model was established by using test results fitting method, offering a way to conduct qualitative analysis for the wear problem under the same conditions. Findings The results show that mainly the wear mechanism of the piston skirt under boundary lubricated conditions is adhesive wear and abrasive wear. In addition, the coefficient and wear rate will increase with the increase in the normal load and surface roughness and decrease with the increase in the relative speed. In the wear model, the wear loss is mainly influenced by the normal load, the relative sliding speed and the wear time. Originality/value The wear degree of piston skirt was qualitatively obtained in this investigation by factors such as pressure, velocity and so on, and the wear mechanism of forged steel piston skirt under boundary lubrication conditions was also determined. These could provide theoretical support for further optimization of cylinder motion and oil supply system, reduction of friction loss and power loss.

Tribological behavior of Ti6Al4 V alloy swing against UHMWPE under different lubrication

2019 ◽  
pp. 089270571988118
Author(s):  
Xinyue Zhang ◽  
Kai Chen ◽  
Linmin Xu ◽  
Jianwei Qi ◽  
Yong Luo ◽  
...  
Keyword(s):  
Wear Mechanism ◽  
Dry Friction ◽  
Friction Pair ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Ultrahigh Molecular Weight ◽  
Different Depths ◽  
Fetal Bovine ◽  
Oxidation Wear ◽  
Lubrication Conditions ◽  
Friction And Wear Tests

Friction and wear tests were performed in this study between the Ti6Al4 V socket and ultrahigh molecular weight polyethylene (UHMWPE) ball on swinging friction tester to clarify the wear mechanism of Ti6Al4V/UHMWPE friction pair under different conditions, including dry condition, simulated body fluid (SBF), and fetal bovine serum (FBS). Results showed that there are many scratches in different depths on the edge of the Ti6Al4 V socket, which reveals the characteristic of swinging friction, and the wear severity of the scratches was the worst under dry friction. What is more, the wear mechanism models under different lubrication conditions have been established. The wear mechanism of Ti6Al4 V alloy is mainly a combination of abrasive and oxidation wear, whereas the wear mechanism of UHMWPE is a combination of adhesive and abrasive wear. Compared with the dry friction condition, the friction coefficient and wear rate decreased under SBF and FBS lubrication conditions, and the wear mechanisms presented primarily adhesive wear combined with minimal oxidation wear. Among the three conditions, the effects of reducing friction and improving lubrication showed the following tendency: FBS > SBF > dry condition.

Tool Life and Wear Mechanism of Coated Si3N4 Ceramic Tools in Turning Grey Cast Iron

2013 ◽  
Vol 581 ◽  
pp. 14-17 ◽  
Author(s):  
Valery V. Kuzin ◽  
Sergey N. Grigoriev
Keyword(s):  
Cast Iron ◽  
Wear Mechanism ◽  
Grey Cast Iron ◽  
Ceramic Surface ◽  
Finish Turning ◽  
High Effectiveness ◽  
Ceramic Tools ◽  
Layered Coating ◽  
Grey Cast ◽  
A Chain

This paper presents results of the investigation of Si3N4 ceramic inserts with CVD coatings in turning grey cast iron. The high effectiveness of Si3N4 ceramic inserts with multi-layered coating in the finish turning of the grey irons was shown. It was established that at the heart of the wear mechanism of coated Si3N4 ceramic inserts there is a chain of relations cutting conditions loading fracture of coating сhipping of ceramic surface layer failure of tools. One of the important features of wear mechanism of these tools is the operational defects formed at the coating substrate interface.

scholarly journals Investigation on Wear Characteristics of Cemented Carbide Tools in Finish Turning Spherical Shells of Pure Iron

2021 ◽  
Author(s):  
Yu Chen ◽  
Jinxing Kong ◽  
Zhenyu Zhang ◽  
Dongxing Du
Keyword(s):  
Tool Wear ◽  
Spherical Shell ◽  
Pure Iron ◽  
Flank Wear ◽  
Contact Point ◽  
Single Point ◽  
Formation Mechanisms ◽  
Wear Characteristics ◽  
Diffusion Wear ◽  
Notch Wear

Abstract A thin-walled spherical shell made of pure iron material is a key part of precision physical experiments. Tool wear is an important factor restricting its geometric accuracy. And tool wear characteristics of curved surface parts are significantly different from those of single-point turning due to the movement of the contact point between the tool and the workpiece. Hence, this article takes the pure iron spherical shell as the research object, which is aimed at investigating the formation mechanisms of flank wear land. Tool wear characteristics are compared between spherical shell turning and end face turning. The results show that uniform flank wear land and notable notch wear occur when turning end face, but notch wear disappears and only flank wear land exists when turning spherical shell. Based on major notch position and minor notch position, a mathematical model is developed to explain formation mechanisms of flank wear land during turning spherical shell of pure iron materials. Theoretical and experimental results show that flank wear land results from the major and minor notch movement. Spherical shell turning and end face turning have the same wear mechanisms, mainly composed of adhesive wear, diffusion wear and oxidation wear.

Sign in / Sign up

Export Citation Format

Share Document