李一楠,张勇,冯天明,兰红波,彭子龙.放电沉积凸貌微织构表面动压润滑性能仿真研究[J].表面技术,2019,48(8):59-67.
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].Surface Technology,2019,48(8):59-67
放电沉积凸貌微织构表面动压润滑性能仿真研究
Simulation Study on Hydrodynamic Lubrication Performance of Convex Texture Surface Based on Discharge Deposition
投稿时间:2019-02-22  修订日期:2019-08-20
DOI:10.16490/j.cnki.issn.1001-3660.2019.08.009
中文关键词:  放电沉积加工  凸貌  微织构  织构设计  面积比  动压润滑特性
英文关键词:discharge deposition  convex  micro texture  pattern design  area ratio  hydrodynamic lubrication characteristics
基金项目:国家自然科学基金项目(51875300);山东省重点研发项目(2018GGX103036);山东省自然科学基金项目(ZR2017MEE012,ZR2018MEE017)
作者单位
李一楠 青岛理工大学 a.山东省增材制造工程技术研究中心 b.机械与汽车工程学院,山东 青岛 266520 
张勇 青岛理工大学 a.山东省增材制造工程技术研究中心 b.机械与汽车工程学院,山东 青岛 266520 
冯天明 青岛理工大学 a.山东省增材制造工程技术研究中心 b.机械与汽车工程学院,山东 青岛 266520 
兰红波 青岛理工大学 a.山东省增材制造工程技术研究中心 b.机械与汽车工程学院,山东 青岛 266520 
彭子龙 青岛理工大学 a.山东省增材制造工程技术研究中心 b.机械与汽车工程学院,山东 青岛 266520 
AuthorInstitution
LI Yi-nan a.Shandong Engineering Research Center for Additive Manufacturing, b.School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China 
ZHANG Yong a.Shandong Engineering Research Center for Additive Manufacturing, b.School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China 
FENG Tian-ming a.Shandong Engineering Research Center for Additive Manufacturing, b.School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China 
LAN Hong-bo a.Shandong Engineering Research Center for Additive Manufacturing, b.School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China 
PENG Zi-long a.Shandong Engineering Research Center for Additive Manufacturing, b.School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China 
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中文摘要:
      目的 提出一种表面凸貌微织构的快速制造方法,并对其表面动压润滑性能及减摩机制进行研究。方法 利用高低压复合放电沉积加工技术实现气体介质中金属或半导体材料表面凸貌微织构的制备。高压脉冲电压实现两极间介质的电离度,低压直流放电实现电极材料蚀除,并沉积在工件表现形成微织构。通过控制工具电极直径,可获得直径410 μm、高12 μm尺度的凸貌微织构。利用FLUENT软件,对该方法所获的凸貌微织构表面动压润滑性能进行仿真,研究了不同高度、直径、面积比下,表面微织构对润滑性能的影响规律。结果 织构面积比和动压润滑性能成正比关系:随着面积比增大,织构上表面平均压力增大。油膜上表面平均压力在高度为7 μm、直径为500 μm、面积比为60%、对摩速度0.5 m/s时,达到最大值1.21×104 Pa。动压润滑性能随单个凸貌微织构高度的增加,先增大后减小,并在7 μm时达到最大。织构直径对润滑性能影响明显,仿真结果表明,在一定条件下,加大织构直径可提高油膜上表面平均压力。结论 凸貌微织构采用增材制造方法,减小了传统去除材料的织构制造方法导致的对材料强度的影响。该方法工艺简单,成本低,不需辅助其他加工条件。表面凸貌微织构的存在使两接触表面的间距减小,形成收敛楔,从而形成动压,使润滑膜产生动压承载力,改善了摩擦学性能。对凸貌微织构的结构参数(面积比、微织构高度、直径)进行仿真分析,获得了织构结构参数对动压润滑特性的影响规律,为后续研究提供了理论支持。
英文摘要:
      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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