| LI Yi-nan,ZHANG Yong,FENG Tian-ming,LAN Hong-bo,PENG Zi-long.Simulation Study on Hydrodynamic Lubrication Performance of Convex Texture Surface Based on Discharge Deposition[J],48(8):59-67 |
| Simulation Study on Hydrodynamic Lubrication Performance of Convex Texture Surface Based on Discharge Deposition |
| Received:February 22, 2019 Revised:August 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.08.009 |
| KeyWord:discharge deposition convex micro texture pattern design area ratio hydrodynamic lubrication characteristics |
| Author | Institution |
| LI Yi-nan |
a.Shandong Engineering Research Center for Additive Manufacturing, b.School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| ZHANG Yong |
a.Shandong Engineering Research Center for Additive Manufacturing, b.School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| FENG Tian-ming |
a.Shandong Engineering Research Center for Additive Manufacturing, b.School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| LAN Hong-bo |
a.Shandong Engineering Research Center for Additive Manufacturing, b.School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| PENG Zi-long |
a.Shandong Engineering Research Center for Additive Manufacturing, b.School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao , China |
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| Abstract: |
| The work aims to propose a method to rapidly manufacture the convex micro texture surface and study the surface hydrodynamic lubrication performance and wear resistance mechanism. High and low voltage composite discharge deposition technology was used to prepare convex micro texture surface of metal or semi-conductor in gas medium. High impulse voltage was adopted to realize the ionization degree of medium between two electrodes and low-voltage DC discharge was employed to remove the corrosion on electrode materials and form micro texture on piece surface through deposition. By controlling the electrode diameter of tools, the convex micro textures with diameter of 410 μm and height of 12 μm could be obtained. The hydrodynamic lubrication performance of the convex micro texture surface obtained by discharge deposition method was simulated by FLUENT software to study the influences of convex micro texture on the lubrication performance of metal surface under different height, diameters and area ratios. Texture area ratio was directly proportional to hydrodynamic lubrication performance. With the increase of the area ratio of surface micro texture, the average pressure on the surface of oil film increased. The maximum value of surface pressure on oil film reached 1.21×104 Pa under the condition of height of 7 μm, diameter of 500 μm, area ratio of 60% and relative velocity of 0.5 m/s. The hydrodynamic lubrication performance increased first and then decreased with the increasing height of single convex texture, and reached the maximum at 7 μm. The texture diameter had obvious influence on the lubrication performance. Simulation results showed that under certain conditions, increasing texture diameter could improve hydrodynamic lubrication performance. The convex micro texture can be fabricated by additive manufacturing method, which reduces the influence of material strength caused by traditional removal method. This method has unique advantages such as simple process, low cost and no requirement on other processing conditions. The surface micro textures reduce the spacing between two contact surfaces and form a convergence wedge which can generate dynamic pressure, thus resulting in the higher bearing capacity and better tribological performance. The influences of convex micro texture parameters including texture area ratio, texture height and diameter on hydrodynamic lubrication characteristics have been simulated and analyzed to provide theoretical support for further research. |
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