| 摘要 |
A drawing arrangement for producing drawn formations in sheet-shaped workpieces includes a lower tool having a supporting surface for the workpieces and a recess which opens onto the supporting surface, and an upper tool having a female die and movable toward and away from the lower tool for confining a region of the workpiece between itself and the supporting surface. A mandrel is mounted in the recess of the lower tool for movement between a retracted position in which it is fully accommodated in the recess and thus does not project beyond the supporting surface and form an obstruction to the movement of the workpiece, and an extended position in which it penetrates into the female die and forms the drawn formation in the workpiece. The punch is mountd on an actuating member which has a lower contact surface, and the movement of the actuating member is achieved by a lifting device which has an operating member movable toward and out of contact with the contact surface, and a spring which urges the actuating member toward its retracted position. During the retraction movement, the punch itself acts as a stripping tool for the workpiece. A descending chute can be interposed between the actuating and operating members and has a pivotable section movable out of the path of movement of the operating member. The operating member may move at different speeds during approach to the actuating member and thereafter.
|
