Test & measurement
FOURFOLD TESTING PLUS MARKING ON THE FLY
In addition to the insertion force testing integrated into the tool, KRAMSKI worked with Kistler to implement the following additional test steps:
feed control during conveyor belt feeding
checking for stamping waste (double sheet control)
laser marking of finished parts (marking on the fly)
optical end-of-line testing (contour, dimensions, surface)
These tests are carried out using additional technologies from Kistler, such as optical sensors that have been specialized for stamping technology, a laser marking cell and an automatic testing system that includes camera systems and industrial image processing.
HIGHLY COMPACT FORCE SENSOR INSTALLED IN THE STAMPING TOOL One point to note here is that both the finished connector and the sensor must be extremely compact. “In order to implement the testing of insertion forces in the production process, the sensor is installed directly in the progressive tool – it’s not even visible from the outside. Thanks to its compact size of just over 10 mm, the miniaturized force transducer 9313AA1 from Kistler is ideal for this purpose,” continues Carle. “Furthermore, the square sensor body with dual-side force application via axial threaded holes is ideal for this application.” In addition, piezoelectric force sensor technology from Kistler offers other favorable characteristics that have now also proven themselves in automated stamping applications: for example, overload capacity, high stiffness and sensitivity, and – most importantly – longevity. “Once the sensors have been installed in the stamping tool
The miniature force sensor (not visible) from Kistler is directly integrated into the stmaping tool from KRAMSKI (cable outlet on the left underneath the center of the image) (source: Kistler Group).
and the line is in operation, we need to be able to rely on them over the long term,” adds Carle. With the help of this new inline process monitoring as well as additional test steps that have been integrated into the production line (see the text box for more information), KRAMSKI was able to optimally satisfy the strict requirements of Hirschmann Automotive. “In addition to Kistler’s leading technology, we also appreciate the close working relationship and
the mutual understanding we have built. Over the years, this has evolved into a true development partnership that benefits both sides,” emphasises Felix Nussbaum. “Together, we are operating at the limits of what is technically feasible and continue to push these limits further and further. This fits very well with the extremely high quality standards at KRAMSKI and should be described as a win-win relationship.” The positive experiences with the integrated force sensor technology and process monitoring from Kistler are also demonstrated by the fact that KRAMSKI has now commissioned a second solution for an additional production line that will be implemented in the near future.
Kistler
www.kistler.com
Instrumentation Monthly May 2024
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