圆头平键的圆头部分一般是用手工锉出(图1)。我厂工具组老师傅开动脑筋,自制了一种简单的夹具,在牛头刨上一次能刨出24根,这样不但效率高,质量好,而且大大降低了劳动强度。夹具的结构如图2所示,平键7装在回转体5的长槽中,并用螺钉10将平键顶紧。在平键的下端用两根螺栓12,通过压板13用螺帽11将平键牢牢地夹紧。平键的上面用顶针6顶住平键的圆心。在回转体5的两端,焊有两根回转轴15和16;轴15和16在轴承3和17内。转动手柄14,蜗杆2带动蜗轮4旋转。蜗轮通过键使回转体5和工件7转动。整个夹具用定 Round head flat key part of the general manual file (Figure 1). My factory tool group chef brains, made a simple fixture, the first time in the diggod can dig out 24, so that not only high efficiency, good quality, but also greatly reduce the labor intensity. Fixture structure shown in Figure 2, flat key 7 installed in the rotating body 5 of the long groove, and the flat key with a screw 10 tight top. At the lower end of the flat key, two bolts 12 are used, and the flat key is securely clamped by the pressure plate 13 with the nut 11. Ping key above thimble 6 to withstand the key flat center. At both ends of the rotary body 5, two rotary shafts 15 and 16 are welded; the shafts 15 and 16 are in the bearings 3 and 17. Rotate the handle 14, the worm 2 drives the worm wheel 4 to rotate. The worm gear rotates the rotor 5 and the workpiece 7 by means of a key. Fix the entire fixture