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R O L A N D
Rev. 1.0
3. System description
Flexible manufacturing systems in sheet metal processing require automated and reliable double sheet
control systems in order to safeguard presses and other processing machinery against damage due to
multiple sheets. This applies not only to steel but also to aluminum and other non-ferrous metals as well
as non-magnetic stainless-steel (austenite), materials as they are increasingly being used in automotive
applications. In addition, the production of so-called "Tailor Welded Blanks" (TWB) has created complex
manufacturing systems with special requirements regarding automated double sheet control systems.
The Double Sheet Detector UDK20 was specifically developed for this technical environment. The special
feature of the system is the ability to monitor ferrous and non-ferrous materials with one sensor only - the
PW42AGS.
A system for one measuring point consists of the following three components:
•
Control unit
•
Sensor PW42AGS for ferrous and non-ferrous materials
•
Sensor cable
3.1 General hints for process security
The process security of the system is influenced by the following factors:
•
the stability of the measuring values
•
the setting of under-gauge threshold and over-gauge threshold
•
the evaluation of the status signals
Stable measuring conditions will result in stable measuring results. For measuring procedures with single-
sided contacting sensors the air gap between sensor and material surface is a decisive criterion.
Air gaps varying from measurement to measurement will cause varying mesuring results. Basically, such
situations are bad, since in such cases the user is inclined to decrease the under-gauge threshold and to
increase the over-gauge threshold. On doing so, the user puts up with the drastically increasing risk of not
detecting a double sheet.
The following external factors decisively influence the stability of measuring results and need to be
considered for operation of a double sheet detector:
•
the air gap between sensor and material surface
•
the electrical and magnetical characteristics of the material
•
the tolerance in material thickness
From this some simple rules derive, which enable a large degree of process security when abided by:
•
Always care for good contact of the sensor with the material !
•
Use the same program to monitor materials of the same thickness and alloy !
•
Adjust the switching threshold as tight as possible !
ROLAND ELECTRONIC GMBH · Otto-Maurer-Str. 17 · D-75210 Keltern · Telefon (0049) (07236) 9392-0 · Telefax (0049) (07236) 9392-33
OPERATING INSTRUCTIONS
DOUBLE SHEET DETECTOR R1000 UDK20
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