3 Fundamentals of press design

Sheet metal forming lines
Fig. 4.4.3 Components and design of a hydraulic universal press
parts (Fig.4.4.4). This type of press is used for example for the production
of ball and needle bearing sleeves. Depending on the press size
– the rated press force of standard presses ranges from 1,250 to 4,000 kN
– up to 300 strokes per minute can be achieved using a special tri-axis
transfer system. The desired quality and output of the produced parts
place stringent demands on the press configuration, in particular on
the frame, drive system and slide gibs.
The required standard of drive system precision is achieved using an
eccentric shaft mounted in roller bearings. The shaft is driven by a compact
drive system with planetary gear. The roller bearings ensure only
minimal play in the power delivery system of the press. A further benefit
of the eccentric shaft mounted in roller bearings is that no additional
release devices are required in case of press jamming due to an
operating error. The eccentric shaft drives not only the main slide but
also the transfer system, the draw cushion and a secondary slide. The
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998
tie rod
slide
cylinders
slide
drawing die
bed cushion
high-speed
piston
bed cushion
cylinders
201