A portable and rotary type ultrasonic drillingmachine is developed and designed for drilling of carbon fibre composition components.
为碳纤维复合材料构件的钻孔，研制出一种便携式旋转超声钻。
2
This paper described the structure, features, test results and application effect of the newly developed Model QFZ-22 portabledrillingmachine for outburst control.