Development of a mathematical model of hydroerosive wear in piston couples of hydraulic machines: Part 2

Budarova, O. P.; Boldyrev, S. V.

doi:10.3103/s1068366614060038

Cited by 3 publications

(1 citation statement)

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“…However, fewer research studies on forging steel piston have been conducted systematically, and only a few references on the structure strength and the applicability could be found by far (Liu et al, 2006). At present, the lubrication state of rough surface is usually determined by film thickness ratio, ratio of nominal lubricating oil film thickness to the rough degree of surface (Sedlaček et al, 2012;Chen, 2005;Ghanbarzadeh et al, 2015;Zhu et al, 2013;Budarova and Boldyrev, 2014;Gebretsadik et al, 2015;Sel'kin and Kopylov, 2016), and when the ratio is less than 1, it is considered to be in the boundary lubrication state (Chen, 2005;Dong et al, 2007;Hager et al, 2009). The aim of this paper is to study the wear mechanism of forged steel piston skirt by applying the method of combining theoretical deduction and experimentation.…”

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confidence: 99%

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

Zhang

Deng

Gao

et al. 2018

ILT

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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.

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