Punching drill

The utility model discloses a punching drill which comprises a first punching drill body and a second punching drill body, the second punching drill body is arranged in the first punching drill body, the first punching drill body and the second punching drill body are coaxially arranged, and the first punching drill body and the second punching drill body rotate in opposite directions. According to the punching drill provided by the utility model, the two punching drills which are sleeved inside and outside are designed and coaxially and reversely rotate, so that when a honeycomb body is punched, the deformation of a supporting structure of the honeycomb body is prevented, and the reduction of functions of the honeycomb body caused by the fact that residual materials and chippings generated by punching enter the honeycomb body can also be prevented. 本实用新型公开了一种打孔钻，包括第一打孔钻和第二打孔钻，其中，第二打孔钻设于第一打孔钻内部，并且第一打孔钻和第二打孔钻同轴设置，第一打孔钻和第二打孔钻相互反向旋转。本实用新型提供的打孔钻，通过设计内外套设的两个打孔钻，使其同轴反向旋转，实现对蜂窝体上打孔时，防止蜂窝体的支撑结构的变形，也能防止打孔产生的残料和碎屑进入蜂窝体