Circular knifes are used to cut large coils into strips. The knife has to withstand heavy forces and achieve the following criteria at all times

  • low burr cut
  • undamaged sheet edge

Therefore a steady control of the knife’s wearing and detection of possible cracks is essential.

imess S25 manages these tasks reliable and within a few seconds. The knife is positioned on top of a rotary plate by hand or robot. The plate turns the knife along a line scan camera and a laser sensor.

Unlike the classic method, a manual test, the optical control offers four main advantages:

  • operator independent: objective evaluation of knife quality.
  • contact-free: the risk of accidents is reduced.
  • real measurement values: the knife’s crack depth and wearing are measured and available for further analysis
  • economic efficiency: After the wearing area is detected, the knife’s grinding can be done more targeted. Security margins are no longer needed and therefore the knife’s lifetime can be extended.

The raw data is analysed by the software and the amount of wearing depicted. To calculate the crack depth, the initial knife edge has to be reconstructed by complex calculation steps. Found cracks are listed in a table and marked in colour (according to the set tolerances). Setting of specific OK/NOK criteria is possible as well as saving results in Excel-readable format.

Take a closer look.

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