基于单颗粒模型的航发叶片砂带磨削微观仿生锯齿状表面形成及实验

基于鲨鱼皮衍生出来的微观仿生表面被广泛应用于机翼等航空零部件的设计中，对于提高航空零部件的疲劳寿命、气流动力性等服役性能具有重要作用。砂带磨削能实现零部件表面的高完整性要求的加工，故常用于叶片、整体叶盘等复杂曲面的精密磨削，且能实现微观表面形状，但目前缺乏砂带磨削微观表面的系统研究从而难以实现其精确控制。首先，分析了微观仿生锯齿状表面的典型结构特征，基于单颗粒砂带磨削模型，研究了单颗粒砂带磨削去除机理；然后，建立了砂带磨削多颗粒参数化数学模型，提出了微观仿生锯齿状表面砂带磨削方法；最后，以钛合金叶片型面为对象，搭建以钛合金为典型材料的微观仿生锯齿状表面砂带磨削基础实验平台，进行仿生表面的实验验证。通过对磨削后叶片的表面微观形状参数进行检测，结果表明通过砂带磨削方法实现的微观仿生锯齿状表面以锯齿形沟槽为主，其中沟槽的宽度在2.5~8 μm之间、平均值为4.91 μm，沟槽的高度在3.5~9 μm之间、平均值为5.91 μm，沟槽的夹角在28°~68°之间、平均值为42.3°，验证了微观仿生锯齿状表面砂带磨削的可行性。

Single particle removal model and experimental study on micro bionic zigzag surface of aeronautical blade using belt grinding

The micro-biomimetic surface with drag reduction and high integrity derived from shark skin is widely used in aviation blades, playing an important role in improving the fatigue life and aerodynamic performance of aviation parts. Since belt grinding can achieve the machining of parts' surface with high integrity requirements, it is often used in the processing of blades. While it can achieve the machining of micro-surface shapes, few studies on the micro-surface of belt grinding have been conducted. Firstly, its typical structural characteristics are analyzed. Based on the grinding model of single grain belt, the grinding removal mechanism of single particle is studied. Then the parametric mathematical model of belt grinding particles is established, and the micro bionic zigzag surface grinding method is proposed. Finally, the blade profile of titanium alloy is verified by building the basic experimental platform of micro-bionic zigzag surface grinding with titanium alloy as the typical material. Micro shapes' parameters on the surface of a blade after processed are determined. The results showed that the majority of the micro bionic zigzag surface achieved by the belt grinding method has zigzag groove. The groove width is between 2.5-8 μm with a mean value of 4.91 μm, the height of the groove is between 3.5-9 μm with a mean value of 5.91 μm, and the groove angle is between 28°-68° with a mean value of 42.3°. These results verified that belt grinding can achieve the machining of micro bionic zigzag surface.