ISSN   1004-0595

CN  62-1224/O4

高级检索

织构深度对不锈钢表面油润滑条件下摩擦学性能影响的试验和仿真研究

Experiment and Simulation Study on the Effect of Texture Depth on Tribological Properties of Stainless Steel Surface under Oil Lubricating Condition

  • 摘要: 采用激光加工技术在不锈钢表面构造深度不同的沟槽型织构图案,通过UMT摩擦磨损试验机测试了不同织构深度的不锈钢表面在PAO6油润滑条件下的摩擦磨损性能,利用表面轮廓仪和扫描电镜(SEM)对摩擦前后的沟槽形貌进行表征分析,采用计算流体动力学(CFD)方法对试验进行模拟并计算,结合ANSYS Fluent软件模拟分析结果,探究了沟槽织构深度对不锈钢表面在油润滑条件下的摩擦学性能的影响机理. 研究结果表明:加工的沟槽织构及其织构深度显著影响不锈钢表面在PAO油润滑条件下的摩擦磨损行为,织构深度为10 μm的不锈钢表面获得最好的抗磨和减摩效果,与未织构表面相比,其摩擦系数与磨痕宽度降低了60%以上. 这主要是由于织构深度为10 μm的不锈钢表面在摩擦过程中,润滑油通过其收敛区域时产生了很好的楔效应,润滑油产生的升力较大,改善了该织构表面在摩擦过程的润滑状态,从而呈现很好的摩擦学性能.

     

    Abstract: Textured structures with different groove depths were fabricated by laser processing technique on stainless steel (SS) surface. The friction and wear behaviors of the textured surface with different groove depths were tested by a UMT friction and wear tester under the PAO6 lubricating condition. The morphologies of the textured surface before and after friction were characterized by a surface profilometer and a scanning electron microscopy. The experimental results were verified by theoretical simulation using CFD technique. According to the simulated results of ANSYS Fluent analysis, the influence mechanism of the groove depths on the tribological properties of the textured SS surface under oil lubricating condition was proposed. The result shows that the groove texture and the varying depths of the grooves remarkably affected the friction and wear behaviors of the modified SS surface under the PAO lubricating conditions. The modified SS surface with the groove depth of 10 μm exhibited the best anti-wear and friction-reducing abilities among all investigated samples, and its friction coefficient and wear rate were reduced by over 60% as compared to the untextured surface. This result was mainly attributed to the increased lifting force of the lubricant because of the formed wedge effect as the lubricating oil past the formed convergence region during the rubbing process. The increased lifting force improved the lubricating state the textured surface with 10 μm grooves and corresponded to its superior tribological properties at the rubbing process.

     

/

返回文章
返回