3 Fundamentals of press design

490 Solid forming (Forging)
Fig. 6.7.4 Four-station die holder with hydraulic sleeve clamping and shearing station
in the fourth station
Each die holding sleeve is fastened by means of two to four hydraulic
wedge-type clamps (Fig.6.7.3). This design is used for large batch sizes
when the tools wear at very different rates in the individual stations
and have to be individually replaced. In this case, ready prepared die
holding sleeves are located in a prescribed loading position and can be
mounted into the die station by a die changing arm (cf. Fig. 3.4.5). It
takes between 4 and 8 min to replace one sleeve. Figures 6.7.3 and 6.7.4
illustrate the use of intermediate sleeves which can be assembled with
axial pre-stressing. Multiple-station forging permits subsequent operations
to be executed in one processing step. As illustrated in Fig. 6.7.4
and 6.7.5, in the case of this specific die holder, the end of the extruded
shaft is sheared to the required length by a wedge-action pusher die
in the fourth die station.
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998