光学 精密工程, 2016, 24 (4): 788, 网络出版: 2016-06-06
研磨抛光表面微孔织构的形成
Formation of surface micro-pore texture by grinding and polishing
表面织构 研磨抛光 微孔成型 表面形貌 次生孔 surface texturing grinding-polishing micropore molding surface morphology secondary pore
摘要
由于表面织构可以改善机械零部件的摩擦磨损特性, 延长其使用寿命, 本文基于研磨抛光方法开发了一种表面微孔快速成型技术。该技术的特点是微孔成型过程与抛光过程同步进行。选取载荷为0.023 2 MPa、研磨液浓度为9%、研磨速度为2.09 m/s以及研磨粒径为0.5 μm作为考察条件, 研究了微孔在金属表面的形成机理, 证明了表面微孔是由于研磨颗粒在表面预制微缺陷处做涡旋运动, 同时工件的自转使研磨颗粒在360°方向上依次磨削微缺陷壁面而形成的。利用该技术所形成的微孔周边为圆弧过度, 无其他织构技术所形成的凸起和毛刺, 因此无需进行抛光后处理。利用该方法在一定的织构条件下可以形成次生孔, 从而进一步增加工件的比表面积。另外, 选取合适的研磨时间在适当的织构条件还可以在工件表面形成微米及亚微米孔, 为减少类金刚石(DLC)薄膜内应力和提高界面结合强度提供了新的思路。研究显示研磨抛光表面微孔织构技术具有设备简单、效率高、适合大面积, 多种材料织构等特点。
Abstract
As surface texturing technology can significantly improve the friction and wear properties of mechanical components and can extend its lifespan, this paper proposes a technology to rapidly form micro-pores on the metal surface by grinding and polishing method. This technology is characterized by carrying molding process and polishing process simultaneously. By choosing a load of 0.0232 MPa, slurry concentration of 9%, polishing rate of 2.09m/s and an abrasive grain diameter of 0.5μm as the investigation conditions, the formation mechanism of micro-pores on the metal surface is researched. It confirms that the surface micro-pores are formed by the vortex flow motion of the abrasive particles in surface micro defects and the rotation of work component allowing the abrasive particles to grind the wall of defects in turn in the direction of 360°. Moreover, the rounding of micro-pore formed by this technology is arc transition without projections and glitch, which does not require further polishing. By the proposed technology, secondary pores can be formed to extend the specific surface area of the work component under certain texturing condition. In addition, a large amount of micron and sub-micron pores are formed on the surfaces of work components by selecting proper grinding time and texturing condition, which provides a new direction for decreasing the internal film stress and improving interface bonding strength of Diamond-like Carbon (DLC). This study indicates that the micro-pore texturing technology on grinding and polishing shows the characteristics of simple device, high efficiency as well as large area and multi-material textures adapted.
郑锦华, 吴双, 魏新煦, 王俊杰, 许璐. 研磨抛光表面微孔织构的形成[J]. 光学 精密工程, 2016, 24(4): 788. ZHENG Jin-hua, WU Shuang, WEI Xin-xu, WANG Jun-jie, XU Lu. Formation of surface micro-pore texture by grinding and polishing[J]. Optics and Precision Engineering, 2016, 24(4): 788.