3 Fundamentals of press design

Shearing lines
4.6.3 High-speed blanking lines
Blanked and stamped parts made from thicker sheet metal such as chain
link plates, cup springs, aluminium and coin blanks (cf. Fig. 6.8.7)as well
as sheet metals used in electric motors (Fig. 4.6.20) are manufactured in
large quantities, calling for high-performance lines with high stroking
rates – so-called high-speed blanking lines (Fig. 4.6.6).
In this type of press, the blanking process causes sudden changes in
press forces due to the rapid nature of material breakthrough when the
shear strength of the material is exceeded. These forces can result in
major dynamic displacement in the dies (Fig. 4.6.7). Because of possible
negative effects on part quality and on service life of the dies, highspeed
presses are subject to particularly high precision requirements
(Fig. 4.6.8).
Fig. 4.6.6 Blanking line with 1,250 kN high-speed press and die changing cart for automatic
die change (long version)
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