3 Fundamentals of press design

40 Fundamentals of press design
presses, eight-track guides and exchangeable bronze gibs on the slide
are the state of the art. A reliable system of central lubrication is essential
to ensure optimum guidance. Instead of bronze slide gibs, plastic
gibs are also used.
Nowadays, universal presses are frequently configured with eightfold
roller gibs (Fig. 3.1.6). This guidance system is pretensioned free of gib
clearance by individual application of the rollers, which are each
mounted in roller bearings. The rollers are lubricated and sealed for life
and run on hardened guide rails on the press upright free of oil or grease.
Bottom-driven toggle presses feature a long press frame which calls
for a special guidance system to compensate for necking, tilt and prevent
high edge pressures (cf. Fig. 3.2.5).Cardan universal ball joint bearings
compensate for tilts and ensure that the supportive function is
evenly spread over the gibs (Fig. 3.1.5).These guidance components can
be used in any position: inside, outside, sixfold, eightfold or in combination.
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998
Fig. 3.1.6 Roller gib