In processing the inner-hole cercumferencial slots on the heat-exchanger on the tube-plate (steam drum), we often adopt the mechanical inner-hole slotting tools (spiral &eccentric structure).

• 在换热器或锅炉的管板(锅筒)内孔环向槽的加工中，目前我国普遍采用机械式内孔切槽工具加工(结构为螺旋偏心式)。