wear life
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2021 ◽  
Author(s):  
Yuqi Zhu ◽  
Wei Yuan ◽  
Qianjian Guo ◽  
Liguo Zhang ◽  
Wenhua Wang ◽  
...  

Abstract The initial defects have greatly affected the gear transmission under harsh working conditions in the fields of wind power and ships. The influence of linear initial defects on the evolution of wear characteristics of helical gears was studied. The laser marking device was used to process the linear initial defect along the tooth width direction, and the gear without initial defect was used for comparison. It can be concluded that the linear initial defect changed the meshing state of the gear tooth, and greatly shortened the normal wear life of the gear, the normal wear life of the gear is shortened by about 45%, and the wear rate in the stable wear stage is increased by about 56%, a great deal of pitting corrosion and plastic flow on the tooth surface occurred in the pitch circle position of the defective gear. In addition, the lubrication condition deteriorated in the later period caused by lubricating oil pollution and the hard particles falling off the gearbox bearings entered the meshing surface and the emerged crack, which further accelerated the wear process of gear.


2021 ◽  
pp. 1-17
Author(s):  
Neha Singh ◽  
Sujeet K Sinha

Abstract Liquid absorption and tribological studies of epoxy-based composite with ultra-high molecular weight polyethylene (UHMWPE) and MoS2, sliding against steel were conducted. Composites, as coating and as a bulk, were soaked in water, base oil, ionic liquid and lithium-based grease for different intervals of days or months. Liquid weight% gain was more in polar liquids when compared to non-polar. Coated composite soaked in grease for 10 days showed coefficient of friction of 0.08 with wear-life of more than 1 million cycles and wear rate of 1.7×10−8 mm3/Nm. Bulk polymer composite soaked in grease for 180 days provided the least coefficient of friction of 0.06 and specific wear rate of 2.60×10−7 mm3/Nm.


2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Erwanto Erwanto ◽  
Taufiq Hidayat ◽  
Nidia Lestari ◽  
Joko Waluyo

In this design, the product we want to make is a die for the M 20 ring because the die we designed is helpful for student learning (practicum) at the Mechanical Technology Laboratory. The ring manufacturing process is carried out using one blanking compound dies. The blanking and piercing processes are carried out in one operation, thus saving time and money. This dies planning includes the process of designing dimensions and other supporting tools using the SolidWorks 2017 application. This design aims to produce blanking compound dies designs on press machines for the M20 ring manufacturing process with little or no defects and estimate the cost of making blanking compound dies. The method of analysis using Solidworks 2017 software includes displacement, von misses stress, safety factor. The results obtained from the 2017 SolidWorks analysis are to estimate the wear life of the punch and die to anticipate product failures. The material used in this ring is SAPH440 as defined in JIS 3113, starting from 2 mm to 14 mm. At the same time, the one we use for the M20 ring has a thickness of 2 mm. Based on the dies design calculations and data analysis that has been carried out, it is concluded that the use of blanking compound dies can reduce product defects due to dimensional accuracy in the dies and accelerate the production process of ring making.


Author(s):  
Qingyan Zhao ◽  
Tianxiang Yu ◽  
Tianyang Pang ◽  
Bifeng Song
Keyword(s):  

2021 ◽  
Author(s):  
Naofumi Hiraoka

Bonded MoS2 film lubricants are widely used in industry as solid lubricants. It has excellent lubrication properties, but it also has characteristics that require careful consideration. As is well known, its friction and wear are greatly affected by the environmental atmosphere and its wear life depends on the pre-treatment of the substrate. It was found that in many cases the wear life could not be correctly estimated by a specific wear rate and could be explained by the fatigue life, especially under high loading conditions. The atmosphere dependent wear life can also be explained by the fatigue life.


2021 ◽  
pp. 1-49
Author(s):  
Li Xiao ◽  
Yingqiang Xu ◽  
Zhiyong Chen

Abstract In this paper, a multi-layer body model in which material properties and wear coefficient change with node coordinates is proposed, so that the wear profile is not restricted by the singularity of the interface of the coated contact pairs. The conversion rate of the adhered particles was obtained to describe the growth and expansion of the debris at the fretting interface based on experiments, and the wear model of coated contact pair considering the dynamic evolution of the debris layer was established. By comparing the previous experimental and computational results, the wear calculation method proposed in this paper is more reasonable to predict the wear profile of the coated contact pair. In addition, the influence of the debris layer on the wear depth, friction width, and contact pressure in the fretting process is analyzed, indicating that the existence of the debris layer can delay the wear process. Finally, the fretting wear life of the SCMV steel contact pair deposited with the W-DLC coating is estimated.


Wear ◽  
2021 ◽  
Vol 474-475 ◽  
pp. 203870
Author(s):  
K. Masuda ◽  
N. Oguma ◽  
M. Ishiguro ◽  
Y. Sakamoto ◽  
S. Ishihara

2021 ◽  
pp. 1-12
Author(s):  
Jia xing Pei ◽  
Xu Han ◽  
you rui Tao ◽  
Shizhe Feng

Abstract Wear is one of the most common failure forms of gear transmission system. In this paper, a dynamic wear reliability evaluation method for gear system, which subjects to stochastic external load, is proposed on the basis of Markov diffusive process. The stochastic load is considered as the combination of constant load and random noise. The failure is defined as the wear depth of the maximum wear point of gear under the constant load exceeds a specific threshold. The maximum wear point and relative sliding velocity are obtained by deterministic wear analysis. The stochastic noise is assumed as Gaussian white noise; hence the wear depth can be described as Markov diffusive process, and the transition probability is governed by Fokker-Planck-Kolmogorov (FPK) equation. With the transition probability function, the wear life and dynamic reliability of gear system with different noise spectral density are predicted. The results revel that the wear depth obeys normal distribution and becomes more and more scattered with noise spectral density increases. The wear life does not obey normal distribution, the effect of noise spectral density on mean life is neglectable while on standard deviation of life is considerable.


2021 ◽  
pp. 3-9
Author(s):  
F.G. Nakhatakyan

A method of approximate estimation of the life of a tooth gear by the wear of the teeth of gear wheels in the presence of a misalignment is proposed. The dependences of the of the tooth gear life on loading, formulas for determining the maximum wear and contact pressure are obtained. Keywords tooth gear, wear, life, engagement, misalignment, wear resistance. [email protected]


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