Single-Sided Double Sheet Detection of Thick Blanks ROLAND ELECTRONIC
continuously into new areas. Until now automated destacking
and double sheet detection applied primarily to thin sheets
used in metal packaging and automotive applications. But
new requirements call for double sheet detection for blanks
as thick as 12 mm used for structural components in truck
manufacturing or shipbuilding.
For that reason Roland Electronic developed the new
double sheet sensors P128 which is suitable for single
sheet thicknesses up to 12 mm. Although considerable
effort was expended to make this new sensors largely
compatible to the current control units, the higher power
requirements have resulted in certain restrictions. For
this reason only the fieldbus control unit E20 is powerful
enough to drive this new sensor. Also the measuring and
recovery times of the sensor are higher compared to
sensors for thinner sheets, compare the diagram to the
left.
However, increased measurement times do not
necessarily impact negatively on the generally longer
processing cycles.
As thicker sheets are generally not as flat as thinner sheets the design effort focused on improving the air gap tolerance
of the operation
26 May 2011
