3 Fundamentals of press design

286 Sheet metal forming and blanking
frame distance sleeve
circular blade
sheet metal strip rolling ring
Fig. 4.6.2 Circular shears
which occur between the inner and outer slit coils with each revolution
of the decoiler. The reason for these differences are the thickness variations
in the starting coil material over the coil width.
The production speed achieved by slitting lines ranges from 100 to
500 m/min. The resetting of blades, as well as the removal and hooping
of the slit coils with packaging tape can lead to system bottlenecks.
Improved capacity utilization can be achieved by using automatic
exchange of blades and by recoiling outside the line itself.
4.6.2 Blanking lines
Sheet metal parts with medium and large surface areas are not produced
directly off the coil, but from stacked blanks fed automatically into the
forming press. These blanks are produced in blanking lines with cut-tolength
shears or blanking presses.
Blanking lines consist of the following components:
– coil line (cf. Sect. 4.3)
– shear or blanking press
– stacking line
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998