| 摘要 |
In a method of making screws, rivets or similar objects from a metal wire (6) the wire (6) is moved through a stationary cropping bushing (14) forwardly to a movable cropping bushing (24) present in a receiving position, following which the movable cropping bushing (24) is moved away from the receiving position substantially transversely to the axial direction of the wire to release a blank from the wire (6). The movable cropping bushing (24, 25) is then moved together with the released blank (26) further on to a discharge position, in which a punch (27) is adapted to move the blank (26) partly into a die (16) and to compress the blank (26) sufficiently to pre-upset it by cold flowing in the region between the die (16) and the movable cropping bushing (25). In an apparatus of making screws, rivets or similar objects the movable cropping bushing (24, 25) is secured to a transport device (15), by means of which it can be moved from a receiving position opposite the stationary bushing (14) to a discharge position opposite a die (16) between said die and a punch (27), which is adapted to move the blank (26) partly into the die (16) and to compress the blank (26) sufficiently to pre-upset it by cold flowing in the region between the die (16) and the movable cropping bushing (25). |
