3 Fundamentals of press design

Hydraulic presses
are two variations in use. Standard damping is used for material thicknesses
exceeding 3 mm and for light blanking which only utilizes some
30 % of the press capacity – for example trimming the edge of a workpiece
in a transfer press. Where high-strength materials and sheet thicknesses
below 3 mm are involved, a pre-tensioned damping system is
required, since this is capable of absorbing the energy released instantaneously
at the moment of material separation.
3.3.5 Slide locking
When switching off the press and when working in the die mounting
area, the slide must be reliably safeguarded by a slide locking device.
German accident prevention legislation (UVV 11.064 §12) specifies
that hydraulic presses with a bed depth of more than 800 mm and a
stroke length of more than 500 mm must be equipped with at least one
fixture acting on the upper end position of the slide. This fixture must
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998
Fig. 3.3.7
Stroke limiting and damping device
83