Surface Integrity and Friction Performance of Brass H62 Textured by One-Dimensional Ultrasonic Vibration-Assisted Turning.

Xianfu Liu,Li Li,Jianhua Zhang

doi:10.3390/mi12111398

Xianfu Liu, Li Li + Show 1 more

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https://doi.org/10.3390/mi12111398

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Abstract

The processing method, one-dimensional ultrasonic vibration-assisted turning (1D UVAT), is a potential and efficient way for fabricating a micro-textured surface. This paper aims at exploring the surface integrity and friction performance of brass H62 textured by the 1D UVAT. Four micro-textured surfaces with a specific distribution, size, and shape of dimples were fabricated by optimizing processing parameters, and the corresponding surface topography, subsurface microstructure, and surface roughness were observed and analyzed. A series of friction tests were carried out under oil-lubricating conditions to research the friction performance of micro-textured surfaces. The results show that the reason for the deviation between theoretical and experimental values of dimple depth was further revealed by observing the corresponding subsurface microstructure. The surface roughness of the micro-textured surfaces prepared is related to the number of micro-dimples per unit area and dimple size, which is greater than the surface generated by conventional turning. Compared with the polished surface and micro-grooved surface, the micro-textured surfaces have better friction performance with a lower frictional coefficient (COF) and wear degree. For the micro-textured surface fabricated by 1D UVAT, the number of micro-dimples per unit area has a great effect on the friction performance, and choosing a larger number is more conducive to improving the friction performance under the oil-lubricating condition. Consequently, this study proves that the proposed 1D UVAT can be a feasible candidate for preparing a micro-textured surface with better tribological property.

Highlights

In recent years, due to the potential of micro-textures such as dimples, grooves, and convex areas to improve surface performance, the corresponding research and applications of micro-textured surfaces have gained more and more attention in the engineered fields [1,2,3,4]
The surface roughness value is related to the number of micro-dimples per unit area and dimple size
Under the oil lubricating conditions of low speed and light load, the micro-dimpled surfaces fabricated by the 1D UVAT have better friction performance than the microgrooved surface and the polished surface

Summary

Introduction

Due to the potential of micro-textures such as dimples, grooves, and convex areas to improve surface performance, the corresponding research and applications of micro-textured surfaces have gained more and more attention in the engineered fields [1,2,3,4]. The specific micro-textures on the surface of tribo-pairs can greatly enhance the friction characteristics and load-carrying capacity under certain conditions, which is beneficial to reduce the energy losses [5,6,7,8]. The fabricated micro-textures on the surface in the disk start–stop area can effectively reduce the adhesion and friction between the disc and head, which can further prolong the service life of the magnetic disc [9,10,11,12]. The special micro-textures on the tool surface can reduce the contact length between the tool and chip, store the lubricant, and improve the wear resistance of the cutting tool [13,14,15,16].

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