Round hole punching cutter

The utility model belongs to the technical field of round hole punching cutters, and discloses a round hole punching cutter. The cutter comprises a cutter head part, a cutter handle part and a connecting part, the cutter head part is communicated with the cutter handle part through the connecting part, the outer side of the cutter head part is cylindrical, an inner hole is formed in the inner side of the cutter head part, and the hole wall of the inner hole is connected with the outer wall of the cutter head part to form an annular blade which is used for girdling; the problems that in the prior art, the shape of the bottom of a tool hole is irregular, the quality of the bottom of the tool hole is unstable, the service life of a tool is short, and manufacturing process regulations cannot be met are solved. 本实用新型属于圆孔冲切刀具技术领域，公开了一种圆孔冲切刀具。其中包括刀头部、刀柄部和连接部，刀头部通过连接部与刀柄部连通，刀头部外侧呈圆柱形，刀头部内侧开设有内孔，内孔的孔壁与刀头部外壁相接形成环形刃，环形刃用于进行环切；解决现有技术下刀具开孔底部形状不规则，刀具开孔底部质量不稳定，刀具寿命较低，无法满足制造工艺规定的问题。