图1所示的双层钻模,上层可加工排气管(图2),下层可加工8个摇臂支座(图3)。排气管定位是由V形块7和17从两面对中定位,夹紧是由气缸20推动齿条活塞杆19,使齿轮轴11旋转。齿轮轴两端带有左、右梯形螺纹,使螺母套1和10同时相对移动,带动杠杆2和8,使两V形块等距内移,以保证对中。当气缸反向移动时,就使V形块拉开,即可取出工件。排气管初定位时可用两个可调螺钉6托住,使其不致倾斜。下层加工摇臂支座时,用扁销3定位,并用衬套 Figure 1 shows the double-layer drilling, the upper exhaust pipe can be machined (Figure 2), the lower can handle 8 rocker bearings (Figure 3). The exhaust pipe is positioned by the V-shaped blocks 7 and 17 facing each other from both sides. The pinching is performed by the air cylinder 20 pushing the rack piston rod 19 to rotate the gear shaft 11. Both ends of the gear shaft are provided with left and right trapezoidal threads, so that the nut sleeves 1 and 10 move relative to each other at the same time, so that the levers 2 and 8 are driven, so that the two V-shaped blocks are shifted inwardly equidistantly to ensure centering. When the cylinder moves in the reverse direction, the V-shaped block is pulled apart to remove the workpiece. Exhaust pipe can be used when the initial positioning of two adjustable screws 6 care so that it will not tilt. Lower processing rocker bearings, with flat pin 3 positioning, and the use of bushings