加工叉形零件耳孔内角(倒角),或去除孔口毛刺都比较困难。为此,我们设计制造了专用火具,保证了质量。 锥柄刀杆7(见图)装入立钻主轴孔中,工件下耳孔装在定位块2上,并使工件后部紧靠挡销6,启动立钻,使锥柄刀杆7从工件的上耳孔穿过,当刀头3接触到定位块2的球部后,压簧5被压缩,两刀头自动向两边张 It is more difficult to machine the inner corner of the ear of a forked part (chamfer) or remove the burr on the hole. To this end, we designed and manufactured a special fire, to ensure the quality. Taper shank cutter bar 7 (see picture) into the vertical spindle hole, the workpiece ear hole mounted on the positioning block 2, and the workpiece close to the stopper pin 6, start drilling, the taper shank 7 from the workpiece Of the ear hole through, when the cutter head 3 touches the ball of the positioning block 2, the compression spring 5 is compressed, the two heads automatically to both sides of the sheet