2D-C/SiC复合材料磨削加工表面形成机制
Surface forming mechanism of grinding 2D-C/SiC Composites

采用树脂结合剂金刚石砂轮对二维正交编织结构（2D-C/SiC）复合材料进行平面磨削实验，研究磨削加工参数对磨削后表面形貌的影响规律，并分析了磨削表面形成机制. 结果表明：磨削参数对表面三维粗糙度 (Sa)影响明显，Sa随着磨削深度和工件进给速度的增加而增大，但砂轮线速度的增加，其值反而会降低. 0°纤维磨削区（纤维方向与磨削方向平行）的Sa大于90°纤维磨削区（纤维方向与磨削方向垂直）的Sa. 在磨削过程中，碳纤维的层状脆性断裂是磨削表面形成的主要机制. 0°纤维磨削区比90°纤维磨削区的纤维断裂尺度更加严重，且90°纤维磨削区域上的纤维容易出现拔出.
In this paper，the plane grinding experiment of C/SiC composite material with two dimensional of orthogonal woven structure was carried out by using resin bonded diamond wheel. The formation mechanism of the surface morphology of C/SiC composite was studied. The results showed that the grinding parameters have significantly effect on the surface roughness，such as，the surface roughness increases with an increase in the depth of cut and feed speed，and reduces along with the increase of wheel speed.The surface roughness of 0° fiber bundles is greater than that of 90° fiber bundles. During grinding process，the main formation mechanism of ground surface of C/SiC composite material is layered brittle fracture of carbon fiber. When the grinding direction is at the 0° fiber bundles，the fiber fracture is more serious than that of the grinding direction is at the 90° fiber bundles，while the fiber is easy to pull out when the grinding direction is at the 90° fiber bundles