原位自生TiB_2/Al复合材料磨削表面质量研究

原位自生TiB_2/Al复合材料具有密度小,比强度高,比模量大等特点,在航空航天领域具有广泛的应用前景。为探索原位自生TiB_2/Al复合材料的磨削加工性能,选用单晶刚玉SA砂轮、白刚玉WA砂轮和CBN砂轮在不同磨削参数下对TiB_2/Al复合材料进行磨削试验。首先研究了砂轮材质、转速、工件速度、磨削深度对工件表面粗糙度的影响规律;其次通过对工件表面形貌、磨屑形态、砂轮磨损的观测分析,探索了原位自生TiB_2/Al复合材料磨削表面成形机制;最后基于试验数据,给出了TiB_2/Al复合材料磨削工艺参数优选域。本研究可为颗粒增强金属基复合材料磨削加工提供基础理论支撑。

Experimental Investigation on Grinding Surface Quality of in-Situ TiB2/Al Composites

In-situ TiB2/Al composites have extensive application prospect in the field of aeronautics and astronautics due to their outstanding mechanical properties, such as low density, high specific strength and high specific modulus. Grind-ing experiments were conducted to analyze the grinding performance of in-situ TiB2/Al composites in different grinding pa-rameters by using single alumina wheel, white alumina wheel, and cubic boron nitride wheel respectively. The influence of grinding wheel, wheel speed, workpiece speed, and depth of cut on surface roughness were investigated. Moreover, the to-pography of grinding surface, grinding chips, and the wear on grinding wheel were observed to analyze the surface forming mechanism of in-situ TiB2/Al composites. Finally, the optimal grinding parameters were selected based on the experimental date. The research contents and conclusions will provide theory support for in-situ TiB2/Al composite grinding process.