磨削高体积分数SiCp/Al复合材料表面形成机制  

Surface formation mechanism of grinded SiCp/Al composite with high volume fraction

作　　者：于晓琳[1,2] 赵文珍[1,3] 黄树涛[2] 周丽[2] 

机构地区：[1]沈阳工业大学机械工程学院,沈阳110870 [2]沈阳理工大学机械工程学院,沈阳110159 [3]辽宁科技学院机械工程学院,辽宁本溪117004

出　　处：《沈阳工业大学学报》2012年第6期666-670,709,共6页Journal of Shenyang University of Technology

基　　金：国家自然科学基金资助项目(50975184)

摘　　要：针对高体积分数SiCp/Al复合材料精密加工问题,研究了磨削加工高体积分数SiCp/Al复合材料表面形貌的形成机制.使用金刚石砂轮在干式和湿式两种磨削条件下对高体积分数SiCp/Al复合材料进行磨削实验研究,通过表面粗糙度仪对表面粗糙度进行测量,运用扫描电镜对磨削加工的表面形貌进行观测研究.结果表明:该材料磨削表面的主要缺陷为SiC颗粒拔出、破碎、压入和Al基体的涂敷等,SiC颗粒的破碎和脱落是磨削加工该材料表面形成的主要机制.两种磨削条件下工件进给速度对表面粗糙度的影响比磨削深度更显著,湿式磨削无论是在工件已加工表面形貌和微观结构还是表面粗糙度上都好于干式磨削.To solve the precision machining problem for the SiCp/Al composite with high volume fraction,the formation mechanism of surface morphology of the grinded SiCp/Al composite with high volume fraction was studied.The grinding experiments for the SiCp/Al composite with high volume fraction were carried out with diamond wheel under both dry and wet grinding conditions.The surface roughness was measured with surface roughness tester,and the surface morphologies of the grinded composite were observed with scanning electron microscope（SEM）.The results indicate that the main defects on the grinded surface of the composite are the draw-out,crushing and press-in of SiC particles as well as the coating of Al matrix.In addition,the crushing and falling of SiC particles are the main formation mechanism of grinded surface of the composite.Under both wet and dry grinding conditions,the influence of feeding speed of workpiece on the surface roughness is more significant than that of grinding depth.The wet grinding is superior to the dry grinding in the surface morphology,microstructure and roughness of machined workpiece.

关 键 词：SICP AL复合材料 高体积分数 干式磨削 湿式磨削 金刚石砂轮 表面粗糙度 表面形貌 表面缺陷 

分 类 号：TG580[金属学及工艺—金属切削加工及机床] TB33[一般工业技术—材料科学与工程]