仿鸟羽结构自润滑金刚石砂轮磨削碳化硅陶瓷实验研究

目的 减少金刚石砂轮磨削工程陶瓷材料时的砂轮磨损，改善加工表面质量。方法 以人造金刚石为磨料，青铜结合剂为黏结剂，加入一定质量分数的二硫化钼和二氧化钛纳米颗粒作为填充材料，制备出青铜结合剂自润滑金刚石砂轮。利用脉冲激光在金刚石砂轮表面烧蚀出经设计的仿鸟羽减阻几何结构，得到新型仿鸟羽结构自润滑金刚石砂轮。制备了4种不同工况砂轮，传统青铜金刚石砂轮（TGW）、纳米自润滑金刚石砂轮（NGW）、仿鸟羽结构化金刚石砂轮（FGW）、仿鸟羽结构化纳米自润滑金刚石砂轮（FNGW）以对比其磨削性能差异。开展Si C陶瓷磨削实验，研究FNGW磨削机理。从磨削力、表面质量、砂轮磨损3个方面评价FNGW磨削性能。结果 纳米颗粒的加入不会降低砂轮力学性能，砂轮表面的仿鸟羽结构激光成型烧蚀质量较高，对未烧蚀区域没有影响。与TGW相比，FGW除工件表面粗糙度值Ra与砂轮磨损有略微改善外，其他磨削性能都有明显提升。NGW磨削性能都有所提升，但提升效果不太明显。结合二者优势的FNGW，其各磨削性能都有显著提升。其中磨削力最大降低了65.1%，工件表面粗糙度值Ra最大降低了21.5%，砂轮磨损明显减少，有效提升了砂轮的使...

Experimental Study on the Grinding of Silicon Carbide Ceramics with Self-lubricating Diamond Wheels Imitating Bird Feather Structure

To improve the grinding wheel wear and enhance the surface quality of the workpiece when grinding engineering ceramic materials with a traditional diamond grinding wheel. This paper proposes a design and preparation method for a nano self-lubricating diamond grinding wheel imitating a bird feather structure. Firstly, the bronze bond nano self-lubricating diamond grinding wheel was prepared by taking artificial diamond as abrasive, bronze bond as binder, and adding a certain mass fraction of nano-molybdenum disulfide and nano-titanium dioxide as filler materials. Secondly, the secondary feather trunk structure of swallows with drag-reducing properties was borrowed to be applied to the surface of grinding wheels. The optimal geometric model and dimensional parameters of the imitation bird feather structure applied to the grinding wheel surface were designed. Through orthogonal tests, the optimal laser processing parameters for machining the designed dimensions of the bird-feather imitation structure on the surface of a bronze bond diamond grinding wheel are derived. A new self-lubricating diamond grinding wheel with a bird-feather-like structure was obtained by ablating the designed bird-feather-like drag-reducing geometrical structure on the surface of a nano self-lubricating diamond grinding wheel using a pulsed laser. Four kinds of grinding wheels with different working conditions, namely, traditional bronze diamond wheel (TGW), nano self-lubricating diamond wheel (NGW), bird-feather structured diamond wheel (FGW), and bird-feather structured nano self-lubricating diamond wheel (FNGW), are prepared to compare the differences in their grinding performances. To investigate the grinding performance of FNGW, SiC ceramic grinding experiments were conducted. By analyzing the surface morphology and mechanical properties of FNGW, it was found that the addition of nanoparticles does not degrade the mechanical properties of the wheels and that the bird feather structure on the surface of the wheels has a high-quality laser-formed ablation and does not negatively affect the unabraded areas of the wheels. The grinding performance of the FNGW was evaluated in terms of grinding force, surface quality, and wheel wear. The results show that the addition of nanoparticles does not degrade the mechanical properties of the grinding wheel, and the bird feather structure on the surface of the wheel has a high laser-formed ablation quality and has no effect on the unabated area of the wheel. Compared with TGW, FGW showed significant improvement in grinding performance, but the improvement in surface roughness and wheel wear was not obvious. NGW also showed some improvement in grinding performance, but the overall improvement was not obvious. In the case of FNGW, the combination of the bird-like feather structure and the nanoparticles resulted in a significant improvement in the grinding performance. Compared with TGW, FNGW reduces the grinding force by up to 65.1%, the workpiece roughness value by up to 21.5%, and the grinding wheel wear is significantly reduced, which effectively prolongs the service life of the grinding wheel. The proposed FNGW utilizes the controlled release film-forming effect of self-supplied nanocomposite solid particles in the grinding arc to enhance the lubrication and material removal effect during the grinding process. In addition, it achieves efficient cooling and smooth chip removal by means of a bird feather dampening structure, which improves the anti-wear performance of the grinding wheel surface structure and enhances the surface quality of ceramic material parts.