CiS.01

Signal dispersion

In a straightening press a stamp  pushes against the clamped workpiece and bends it. This produces high pulling- and compression forces that can cause a crack. In that case a shockwave runs through the workpiece and reaches the machine via connected tools which causes machine parts to vibrate.

The QASS broadband vibration sensors pick up those signals on the surface of the machine parts and send them on to the crack identification system CiS.01. Once there, the system filters out the low-frequency parts of the signal, which often originate from mechanical noise inside the system. After integrating the oscillations we have not only the amplitudes but also the energy level at our disposal. Thanks to sensor technology and prefiltration both come with a good signal-to-noise ratio.

Signal evaluation

It is possible to save limit values and preamplification settings on every measuring position and for 255 different workpieces.

If the signal exceeds the defined limits in the amplitude and energy respectively, it will be interpreted as a crack. By using an additional limit value, the system can evaluate if a break occured. In any case, the CiS.01 sends a notification to the machine.

The CiS.01 Sensors are calibrated within the whole metrologically relevant spectrum of 0 to about 200 kHz.

With every workpiece exchange, the device performs a 3-step self-test. It checks the preamplification and filtration chain with a calibration signal, the connection, as well as the coupling of the sensor itself. Deviations from the limit values or the coupling value will cause the CiS.01 to send an “error” message to the PLC.

An annual calibration and regular service will guarantee functional reliability, availability and repeat accuracy.

The crack identification system has an extensive statistics memory. The stored data can either be printed out with an external printer or be transferred to a PC workstation via ethernet connection.

Machine control

The crack detection system can either be controlled over 24 Volt IO lines via the machine PLC or manually with hand release switches. It then provides the machine with various signals like “Ready”, “Error”, “Busy”, “Crack”, “Break” and “Measure on”.

The CiS.01 can be operated from the machines control computer via ethernet connection, using an ActiveX interface.

While the machine is turned off, the same connection can be used to download statistics and signal data for subsequent analysis.

Device status

The CiS.01 has its own web server, which allows for password protected access to most device and parameter settings. The web browser can be used to comfortably send requests or alter settings on the device from a PC or laptop with an established intranet connection to the CiS.01.