单层金刚石工具螺旋钻削复合材料的性能比较

Comparative evaluation of the performances of single layer diamond tools in orbital drilling of composites

使用不同形状、不同磨粒尺寸的单层金刚石工具以螺旋钻孔方式加工多向碳纤维-环氧树脂层压板,比较各工具的加工性能。在复合材料上钻孔时,和传统钻削相比,螺旋钻孔是更先进和完善的方法。选择7种不同工具开展性能试验,研究金刚石磨粒尺寸、刀具槽口类型和末端几何形状对钻进力、温度、钻进缺陷和表面完整性的影响。结果发现高速旋转钻削可以显著降低钻削力。使用磨粒尺寸更小的工具进行加工,可以改善钻孔表面粗糙度,但是其钻削力更大、钻削温度更高。带有槽口的工具可以减轻工具表面堵塞。和平直末端或无槽口的工具相比,球形末端的工具性能更好。

Orbital drilling is an advanced and improved technique over conventional drilling in producing holes in composites.Single layer diamond tools of different geometries and grain sizes were experimentally investigated to explore their performances in orbital drilling of multidirectional carbon/epoxy laminates.The effects of diamond grain sizes,types of flutes and tool end geometries were evaluated in terms of drilling forces,temperatures,drilling-induced defects and surface integrity.It was found that drilling with high spindle rotational speed results in significantly reduced forces.Tools with smaller grain sizes improve hole surface roughness at the cost of increased drilling forces and temperatures.Provision of flutes on tools lowers the tendency of tool clogging.Ball end tools perform better than tools with flat end geometry and without flutes.