2. Hinged Drilling Mold The hinged drilling die shown in Fig. 8 is an application example of a double cylinder serving as both a positioning component and a clamping component. Three positioning cylinders 7 (also 2) are pressed into the large semi-circular holes of the hinge template 3, the workpiece 5 is placed under the two positioning cylinders, the handle 8 is pressed, and when the clamping position is approached, the workpiece 5 is pivoted. Positioning (the axial positioning mechanism is not shown in the figure), the handle 8 is further depressed, and the workpiece 5 is positioned on the cylinder 7 and the positioning plate 6