| 摘要 |
In a method of making objects (1) of the kind consisting of an elongated shank (2) of generally constant thickness and having in each end a part with increased thickness, e.g. a head (3) in one end and a foot (4) in the other, said method being of the kind comprising the following steps a and b: a) a number of blanks (2') are cut from elongate stock of substantially constant thickness, b) the ends of the individual blanks are subjected to a cold-shaping process so as to form in each end a part with increased thickness, e.g. a head (3) and a foot (4), the most important novel feature is c) that on each object or workpiece, the parts (3, 4) wih increased thickness are formed simultaneously by the two ends of the object being acted upon in opposite directions, while the object is guided substantially freely movable in the longitudinal direction of the shaft (2). The invention also concerns a machine for carrying out the method. |
