1, water circulation pearl punching machine: The water circulation pearl punching machine will not only take away the heat generated during drilling, lubricate the cutting edge in time, but also directly crush the drill cuttings, and the generated small chips will be discharged out of the hole with the water flow in time, thus avoiding the tool wear and the quality degradation of the machined hole caused by secondary cutting.

2. There is no water circulation in the pearl punch: the cutting edge of the drill bit can't be cooled in time, and the chips in the hole can't be discharged in time because of the depth, which will not only greatly reduce the life of the tool, but also make the inner wall of the hole rougher because of the secondary cutting, thus further causing a vicious circle.