3 Fundamentals of press design

Presses used for solid forming
Fig. 6.8.8 Hydraulic multiple-station press (nominal press force 20,000 kN,
four stations, loading system, transfer feed and die change support)
Horizontal design
Long tubular parts such as shock absorber sleeves are drawn from
flat blanks or backward cup extrusions made from circular blanks (cf.
Fig. 6.1.1). A subsequent ironing process over several stages then
reduces the wall thickness (cf. Fig. 6.1.2). The workpiece is held by a
punch, which draws it through one or more ironing rings. The bottom
thickness remains unchanged. For this process, extremely long forming
strokes are required. Therefore, in such applications hydraulic presses
are most frequently used.
A horizontal press layout has a number of benefits to offer here:
– set-up on floor level,
– simple gravity feed,
– simple discharge by means of synchronized conveyor belts,
– simple interlinking, for example with automatic edge trimming devices.
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