3 Fundamentals of press design

Sheet metal forming lines
increase in the stroking rate of 10 to 15% without generating high
forces during part acceleration. The motion paths and acceleration values
are calculated once the part family has been defined.
The press concept in which every station is equipped with a separate
slide (Fig. 4.4.38) offers certain advantages over slides which accept several
dies. For example each slide and therefore each die station can be
individually adjusted concerning height, press force and response of
the overload system. The slide is generally subjected to on-center loads,
as the individual die stations do not influence each other. Forces are
absorbed by the four connecting rods with minimal tilt of the slide. The
slides are guided in eight-way gibs which reduce tilting of the slide (cf.
Fig. 3.1.5). The deflection in the direction of transport is reduced in
both the press beds and the slides.
These features ensure – particularly in the case of large dies – an
advantageous effect on part quality and on the service life of dies.
Moreover, it results in reduced die try-out periods and run-in times for
new die sets until production of the first acceptable part.
Separate slides also offer the benefit that the spacing between individual
dies – still with the advantage of reduced part transfer – increases.
part-dependent
contouredtemplate
Fig. 4.4.37 Universal station with three to five programmable axes
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998
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