防弹衣式新型磨具磨削特性研究

Study on grinding characteristics of body armor-based novel abrasive tool

针对高能束流增材制造零部件的加工质量要求,设计了一种基于剪切增稠磨料体系与Kevlar经编间隔织物的新型柔性复合磨具——防弹衣式新型磨具。以选区激光熔融镍合金Inconel 718为加工对象,搭建试验平台进行磨削加工试验,研究了新型磨具的磨削特性和磨损特性,分析了磨削前后工件表面的形貌变化与表面粗糙度变化。结果表明:加工120 min后,工件表面粗糙度R a由初始的5.479μm下降至0.600μm左右;磨削加工后新型磨具的表面存在着部分纤维断裂,但Inconel 718工件表面完整性较好,仅存在少量磨削纹理,且并无磨削烧伤现象,其表面质量得到显著改善。

Focusing on the processing requirements of high-energy beam additive manufacturing parts,a novel flexible composite abrasive tool based on shear thickening abrasive fluid and Kevlar plain weave was designed and fabricated.The processing object was Inconel 718 which was manufactured by selective laser melting.The grinding experiment was carried out based on the developed novel abrasive tool.The grinding characteristics and wear characteristics of the novel abrasive tool were studied.In addition,the changes in the topography and surface roughness of the workpiece surface before and after grinding were studied.The results show that the surface roughness Ra of the workpiece decreases from 5.479μm to about 0.600μm after 120 min of machining,and there are some fiber fractures on the surface of the novel abrasive tool after grinding,but the surface integrity of Inconel 718 workpiece is good except that there are only a few grinding textures.There is no grinding burn,and the surface quality is improved significantly.