钻模特点制造简单,装夹方便,定位可靠,能提高钻孔效率。该工具适用于批量加工中、小型工件钻圆周上的小孔之用。以被加工工件孔定位,依靠3个钢球胀紧孔壁。结构图见右。工作原理将钻模放入被加工工件大孔内,然后旋紧螺钉2,此时φ12.7钢球被螺钉头部的锥面向外挤出与被加工工件的大孔壁紧密接触,并使 Drill features simple manufacturing, easy clamping, positioning reliable, can improve drilling efficiency. The tool is suitable for batch processing of small holes in the workpiece drilling circumference. To be machined workpiece hole positioning, relying on three steel ball expansion hole wall. See the right picture. Working principle The drill into the large hole in the workpiece to be machined, and then tighten the screw 2, φ12.7 ball was screwed out of the cone head of the screw head and the workpiece is processed in close contact with the large hole wall, and