尼龙齿轮内(图1)的心套2是用灰铸铁(HT20-40)制成的。心套在车加工后需沿轴向钻出两排均布于圆周的5个盲孔(图2),虽加工精度要求不高,但仍较麻烦。为此,我们制作了钻夹具(图3)。使用时钻夹具被夹在虎钳上,再将工件(心套)放入夹具体孔中。为便于取放并使工件在孔内转位,可自制锥度木棒插入工件内孔中。工件依靠台阶定位,保证了盲 The core 2 in the nylon gear (Figure 1) is made of gray cast iron (HT20-40). Heart sets in the car after the need to drill two rows of holes are evenly distributed in the circumference of the five blind holes (Figure 2), although the machining accuracy is not demanding, but still more troublesome. To this end, we made a drill fixture (Figure 3). Drill fixture is used when the clamp on the vise, and then the workpiece (heart sets) into the clamp body hole. To facilitate the pick and place the workpiece in the hole indexing, taper stick can be made into the workpiece hole. Workpiece relies on the step positioning, to ensure the blind