超声振动磨削C/SiC复合材料的试验研究

Experimental Study on Ultrasonic Vibration Grinding of C/SiC Composites

采用电镀金刚石砂轮对CVI+PIP综合工艺制备的2.5D正交编织C/Si C陶瓷基复合材料进行了轴向超声振动平面磨削加工试验。通过对超声振动磨削与普通磨削的磨削力、磨削表面三维形貌及粗糙度的分析与测量,对C/Si C复合材料的加工工艺进行了研究。结果表明,磨削过程中材料去除方式以脆性去除为主,碳纤维损伤形式以纤维拉断、剥离、横向断裂为主,基体主要为压溃破碎去除。施加超声振动后磨削力降低35%~40%,表面加工质量也有明显的改善。正交试验结果表明,磨削工艺参数中主轴转速、进给速度、磨削深度对磨削表面粗糙度Sa的影响程度也有所不同,影响顺序为:进给速度>主轴转速>磨削深度,采用高速微磨削可以有效提高磨削效率和表面加工质量。

Experiments of axial ultrasonic assisted plane grinding of 2.5D orthogonal braided C/SiC ceramic matrix composites prepared by CVI+PIP synthesis process was carried out by electroplating diamond wheel.The processing technology of C/SiC composites was studied by analyzing and measuring the grinding force,three-dimensional morphology and roughness of grinding surface between ultrasonic-assisted grinding and conventional grinding.The results show that the material removal method is mainly based on brittle removal during the grinding process,the carbon fiber damage form is mainly fiber pulling,stripping,transverse fracture,and the matrix is mainly crushed and removed.After applying ultrasonic vibration,the grinding force was reduced by 35%–40%,and the surface processing quality is also significantly improved.Orthogonal experimental results show the influence of spindle speed,feed speed and grinding depth on the grinding surface roughness Sa is also different in the grinding process parameters.The specific performance is:feed speed > spindle speed >grinding depth,high-speed micro-grinding can be used effectively improve grinding efficiency and surface finish quality.